Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband
* 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband: IB/iser: iSER Kconfig and Makefile IB/iser: iSER handling of memory for RDMA IB/iser: iSER RDMA CM (CMA) and IB verbs interaction IB/iser: iSER initiator iSCSI PDU and TX/RX IB/iser: iSCSI iSER transport provider high level code IB/iser: iSCSI iSER transport provider header file IB/uverbs: Remove unnecessary list_del()s IB/uverbs: Don't free wr list when it's known to be emptyhifive-unleashed-5.1
Linus Torvalds
commit
61b9175808
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|
@ -41,4 +41,6 @@ source "drivers/infiniband/ulp/ipoib/Kconfig"
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source "drivers/infiniband/ulp/srp/Kconfig"
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source "drivers/infiniband/ulp/iser/Kconfig"
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endmenu
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@ -3,3 +3,4 @@ obj-$(CONFIG_INFINIBAND_MTHCA) += hw/mthca/
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obj-$(CONFIG_IPATH_CORE) += hw/ipath/
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obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/
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obj-$(CONFIG_INFINIBAND_SRP) += ulp/srp/
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obj-$(CONFIG_INFINIBAND_ISER) += ulp/iser/
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@ -1530,7 +1530,6 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
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out_put:
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put_qp_read(qp);
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out:
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while (wr) {
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if (is_ud && wr->wr.ud.ah)
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put_ah_read(wr->wr.ud.ah);
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@ -1539,6 +1538,7 @@ out:
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wr = next;
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}
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out:
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kfree(user_wr);
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return ret ? ret : in_len;
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@ -188,7 +188,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
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idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
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ib_destroy_ah(ah);
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list_del(&uobj->list);
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kfree(uobj);
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}
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@ -200,7 +199,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
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idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
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ib_uverbs_detach_umcast(qp, uqp);
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ib_destroy_qp(qp);
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list_del(&uobj->list);
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ib_uverbs_release_uevent(file, &uqp->uevent);
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kfree(uqp);
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}
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@ -213,7 +211,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
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idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
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ib_destroy_cq(cq);
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list_del(&uobj->list);
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ib_uverbs_release_ucq(file, ev_file, ucq);
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kfree(ucq);
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}
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@ -225,7 +222,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
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idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
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ib_destroy_srq(srq);
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list_del(&uobj->list);
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ib_uverbs_release_uevent(file, uevent);
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kfree(uevent);
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}
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@ -243,7 +239,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
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memobj = container_of(uobj, struct ib_umem_object, uobject);
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ib_umem_release_on_close(mrdev, &memobj->umem);
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list_del(&uobj->list);
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kfree(memobj);
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}
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@ -252,7 +247,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
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idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
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ib_dealloc_pd(pd);
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list_del(&uobj->list);
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kfree(uobj);
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}
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@ -0,0 +1,11 @@
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config INFINIBAND_ISER
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tristate "ISCSI RDMA Protocol"
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depends on INFINIBAND && SCSI
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select SCSI_ISCSI_ATTRS
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---help---
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Support for the ISCSI RDMA Protocol over InfiniBand. This
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allows you to access storage devices that speak ISER/ISCSI
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over InfiniBand.
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The ISER protocol is defined by IETF.
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See <http://www.ietf.org/>.
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@ -0,0 +1,4 @@
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obj-$(CONFIG_INFINIBAND_ISER) += ib_iser.o
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ib_iser-y := iser_verbs.o iser_initiator.o iser_memory.o \
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iscsi_iser.o
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@ -0,0 +1,790 @@
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/*
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* iSCSI Initiator over iSER Data-Path
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*
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* Copyright (C) 2004 Dmitry Yusupov
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* Copyright (C) 2004 Alex Aizman
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* Copyright (C) 2005 Mike Christie
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* Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
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* maintained by openib-general@openib.org
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Credits:
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* Christoph Hellwig
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* FUJITA Tomonori
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* Arne Redlich
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* Zhenyu Wang
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* Modified by:
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* Erez Zilber
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*
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*
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* $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $
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*/
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/hardirq.h>
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#include <linux/kfifo.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/devfs_fs_kernel.h>
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#include <linux/cdev.h>
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#include <linux/in.h>
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#include <linux/net.h>
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#include <linux/scatterlist.h>
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#include <linux/delay.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_transport_iscsi.h>
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#include "iscsi_iser.h"
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static unsigned int iscsi_max_lun = 512;
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module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
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int iser_debug_level = 0;
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MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
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"v" DRV_VER " (" DRV_DATE ")");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
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module_param_named(debug_level, iser_debug_level, int, 0644);
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MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
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struct iser_global ig;
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void
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iscsi_iser_recv(struct iscsi_conn *conn,
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struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
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{
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int rc = 0;
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uint32_t ret_itt;
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int datalen;
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int ahslen;
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/* verify PDU length */
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datalen = ntoh24(hdr->dlength);
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if (datalen != rx_data_len) {
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printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
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datalen, rx_data_len);
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rc = ISCSI_ERR_DATALEN;
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goto error;
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}
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/* read AHS */
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ahslen = hdr->hlength * 4;
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/* verify itt (itt encoding: age+cid+itt) */
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rc = iscsi_verify_itt(conn, hdr, &ret_itt);
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if (!rc)
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rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
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if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
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goto error;
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return;
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error:
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iscsi_conn_failure(conn, rc);
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}
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/**
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* iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
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*
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**/
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static void
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iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask)
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{
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struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data;
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struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
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struct scsi_cmnd *sc = ctask->sc;
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iser_ctask->command_sent = 0;
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iser_ctask->iser_conn = iser_conn;
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if (sc->sc_data_direction == DMA_TO_DEVICE) {
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BUG_ON(ctask->total_length == 0);
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/* bytes to be sent via RDMA operations */
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iser_ctask->rdma_data_count = ctask->total_length -
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ctask->imm_count -
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ctask->unsol_count;
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debug_scsi("cmd [itt %x total %d imm %d unsol_data %d "
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"rdma_data %d]\n",
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ctask->itt, ctask->total_length, ctask->imm_count,
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ctask->unsol_count, iser_ctask->rdma_data_count);
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} else
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/* bytes to be sent via RDMA operations */
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iser_ctask->rdma_data_count = ctask->total_length;
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|
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iser_ctask_rdma_init(iser_ctask);
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||||
}
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||||
|
||||
/**
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* iscsi_mtask_xmit - xmit management(immediate) task
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||||
* @conn: iscsi connection
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||||
* @mtask: task management task
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||||
*
|
||||
* Notes:
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||||
* The function can return -EAGAIN in which case caller must
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||||
* call it again later, or recover. '0' return code means successful
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* xmit.
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*
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||||
**/
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static int
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||||
iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
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||||
struct iscsi_mgmt_task *mtask)
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||||
{
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||||
int error = 0;
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||||
|
||||
debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
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||||
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||||
error = iser_send_control(conn, mtask);
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||||
|
||||
/* since iser xmits control with zero copy, mtasks can not be recycled
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||||
* right after sending them.
|
||||
* The recycling scheme is based on whether a response is expected
|
||||
* - if yes, the mtask is recycled at iscsi_complete_pdu
|
||||
* - if no, the mtask is recycled at iser_snd_completion
|
||||
*/
|
||||
if (error && error != -EAGAIN)
|
||||
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
||||
|
||||
return error;
|
||||
}
|
||||
|
||||
static int
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||||
iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask)
|
||||
{
|
||||
struct iscsi_data hdr;
|
||||
int error = 0;
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
|
||||
/* Send data-out PDUs while there's still unsolicited data to send */
|
||||
while (ctask->unsol_count > 0) {
|
||||
iscsi_prep_unsolicit_data_pdu(ctask, &hdr,
|
||||
iser_ctask->rdma_data_count);
|
||||
|
||||
debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
|
||||
hdr.itt, ctask->data_count);
|
||||
|
||||
/* the buffer description has been passed with the command */
|
||||
/* Send the command */
|
||||
error = iser_send_data_out(conn, ctask, &hdr);
|
||||
if (error) {
|
||||
ctask->unsol_datasn--;
|
||||
goto iscsi_iser_ctask_xmit_unsol_data_exit;
|
||||
}
|
||||
ctask->unsol_count -= ctask->data_count;
|
||||
debug_scsi("Need to send %d more as data-out PDUs\n",
|
||||
ctask->unsol_count);
|
||||
}
|
||||
|
||||
iscsi_iser_ctask_xmit_unsol_data_exit:
|
||||
return error;
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask)
|
||||
{
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
int error = 0;
|
||||
|
||||
debug_scsi("ctask deq [cid %d itt 0x%x]\n",
|
||||
conn->id, ctask->itt);
|
||||
|
||||
/*
|
||||
* serialize with TMF AbortTask
|
||||
*/
|
||||
if (ctask->mtask)
|
||||
return error;
|
||||
|
||||
/* Send the cmd PDU */
|
||||
if (!iser_ctask->command_sent) {
|
||||
error = iser_send_command(conn, ctask);
|
||||
if (error)
|
||||
goto iscsi_iser_ctask_xmit_exit;
|
||||
iser_ctask->command_sent = 1;
|
||||
}
|
||||
|
||||
/* Send unsolicited data-out PDU(s) if necessary */
|
||||
if (ctask->unsol_count)
|
||||
error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
|
||||
|
||||
iscsi_iser_ctask_xmit_exit:
|
||||
if (error && error != -EAGAIN)
|
||||
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
|
||||
return error;
|
||||
}
|
||||
|
||||
static void
|
||||
iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
|
||||
{
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
|
||||
if (iser_ctask->status == ISER_TASK_STATUS_STARTED) {
|
||||
iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
|
||||
iser_ctask_rdma_finalize(iser_ctask);
|
||||
}
|
||||
}
|
||||
|
||||
static struct iser_conn *
|
||||
iscsi_iser_ib_conn_lookup(__u64 ep_handle)
|
||||
{
|
||||
struct iser_conn *ib_conn;
|
||||
struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle;
|
||||
|
||||
mutex_lock(&ig.connlist_mutex);
|
||||
list_for_each_entry(ib_conn, &ig.connlist, conn_list) {
|
||||
if (ib_conn == uib_conn) {
|
||||
mutex_unlock(&ig.connlist_mutex);
|
||||
return ib_conn;
|
||||
}
|
||||
}
|
||||
mutex_unlock(&ig.connlist_mutex);
|
||||
iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static struct iscsi_cls_conn *
|
||||
iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
|
||||
{
|
||||
struct iscsi_conn *conn;
|
||||
struct iscsi_cls_conn *cls_conn;
|
||||
struct iscsi_iser_conn *iser_conn;
|
||||
|
||||
cls_conn = iscsi_conn_setup(cls_session, conn_idx);
|
||||
if (!cls_conn)
|
||||
return NULL;
|
||||
conn = cls_conn->dd_data;
|
||||
|
||||
/*
|
||||
* due to issues with the login code re iser sematics
|
||||
* this not set in iscsi_conn_setup - FIXME
|
||||
*/
|
||||
conn->max_recv_dlength = 128;
|
||||
|
||||
iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
|
||||
if (!iser_conn)
|
||||
goto conn_alloc_fail;
|
||||
|
||||
/* currently this is the only field which need to be initiated */
|
||||
rwlock_init(&iser_conn->lock);
|
||||
|
||||
conn->dd_data = iser_conn;
|
||||
iser_conn->iscsi_conn = conn;
|
||||
|
||||
return cls_conn;
|
||||
|
||||
conn_alloc_fail:
|
||||
iscsi_conn_teardown(cls_conn);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static void
|
||||
iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
|
||||
iscsi_conn_teardown(cls_conn);
|
||||
kfree(iser_conn);
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
|
||||
struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
|
||||
int is_leading)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
struct iscsi_iser_conn *iser_conn;
|
||||
struct iser_conn *ib_conn;
|
||||
int error;
|
||||
|
||||
error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
/* the transport ep handle comes from user space so it must be
|
||||
* verified against the global ib connections list */
|
||||
ib_conn = iscsi_iser_ib_conn_lookup(transport_eph);
|
||||
if (!ib_conn) {
|
||||
iser_err("can't bind eph %llx\n",
|
||||
(unsigned long long)transport_eph);
|
||||
return -EINVAL;
|
||||
}
|
||||
/* binds the iSER connection retrieved from the previously
|
||||
* connected ep_handle to the iSCSI layer connection. exchanges
|
||||
* connection pointers */
|
||||
iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
|
||||
iser_conn = conn->dd_data;
|
||||
ib_conn->iser_conn = iser_conn;
|
||||
iser_conn->ib_conn = ib_conn;
|
||||
|
||||
conn->recv_lock = &iser_conn->lock;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
int err;
|
||||
|
||||
err = iscsi_conn_start(cls_conn);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return iser_conn_set_full_featured_mode(conn);
|
||||
}
|
||||
|
||||
static void
|
||||
iscsi_iser_conn_terminate(struct iscsi_conn *conn)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iser_conn *ib_conn = iser_conn->ib_conn;
|
||||
|
||||
BUG_ON(!ib_conn);
|
||||
/* starts conn teardown process, waits until all previously *
|
||||
* posted buffers get flushed, deallocates all conn resources */
|
||||
iser_conn_terminate(ib_conn);
|
||||
iser_conn->ib_conn = NULL;
|
||||
conn->recv_lock = NULL;
|
||||
}
|
||||
|
||||
|
||||
static struct iscsi_transport iscsi_iser_transport;
|
||||
|
||||
static struct iscsi_cls_session *
|
||||
iscsi_iser_session_create(struct iscsi_transport *iscsit,
|
||||
struct scsi_transport_template *scsit,
|
||||
uint32_t initial_cmdsn, uint32_t *hostno)
|
||||
{
|
||||
struct iscsi_cls_session *cls_session;
|
||||
struct iscsi_session *session;
|
||||
int i;
|
||||
uint32_t hn;
|
||||
struct iscsi_cmd_task *ctask;
|
||||
struct iscsi_mgmt_task *mtask;
|
||||
struct iscsi_iser_cmd_task *iser_ctask;
|
||||
struct iser_desc *desc;
|
||||
|
||||
cls_session = iscsi_session_setup(iscsit, scsit,
|
||||
sizeof(struct iscsi_iser_cmd_task),
|
||||
sizeof(struct iser_desc),
|
||||
initial_cmdsn, &hn);
|
||||
if (!cls_session)
|
||||
return NULL;
|
||||
|
||||
*hostno = hn;
|
||||
session = class_to_transport_session(cls_session);
|
||||
|
||||
/* libiscsi setup itts, data and pool so just set desc fields */
|
||||
for (i = 0; i < session->cmds_max; i++) {
|
||||
ctask = session->cmds[i];
|
||||
iser_ctask = ctask->dd_data;
|
||||
ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header;
|
||||
}
|
||||
|
||||
for (i = 0; i < session->mgmtpool_max; i++) {
|
||||
mtask = session->mgmt_cmds[i];
|
||||
desc = mtask->dd_data;
|
||||
mtask->hdr = &desc->iscsi_header;
|
||||
desc->data = mtask->data;
|
||||
}
|
||||
|
||||
return cls_session;
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_conn_set_param(struct iscsi_cls_conn *cls_conn,
|
||||
enum iscsi_param param, uint32_t value)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
struct iscsi_session *session = conn->session;
|
||||
|
||||
spin_lock_bh(&session->lock);
|
||||
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
|
||||
conn->stop_stage != STOP_CONN_RECOVER) {
|
||||
printk(KERN_ERR "iscsi_iser: can not change parameter [%d]\n",
|
||||
param);
|
||||
spin_unlock_bh(&session->lock);
|
||||
return 0;
|
||||
}
|
||||
spin_unlock_bh(&session->lock);
|
||||
|
||||
switch (param) {
|
||||
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
||||
/* TBD */
|
||||
break;
|
||||
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
||||
conn->max_xmit_dlength = value;
|
||||
break;
|
||||
case ISCSI_PARAM_HDRDGST_EN:
|
||||
if (value) {
|
||||
printk(KERN_ERR "DataDigest wasn't negotiated to None");
|
||||
return -EPROTO;
|
||||
}
|
||||
break;
|
||||
case ISCSI_PARAM_DATADGST_EN:
|
||||
if (value) {
|
||||
printk(KERN_ERR "DataDigest wasn't negotiated to None");
|
||||
return -EPROTO;
|
||||
}
|
||||
break;
|
||||
case ISCSI_PARAM_INITIAL_R2T_EN:
|
||||
session->initial_r2t_en = value;
|
||||
break;
|
||||
case ISCSI_PARAM_IMM_DATA_EN:
|
||||
session->imm_data_en = value;
|
||||
break;
|
||||
case ISCSI_PARAM_FIRST_BURST:
|
||||
session->first_burst = value;
|
||||
break;
|
||||
case ISCSI_PARAM_MAX_BURST:
|
||||
session->max_burst = value;
|
||||
break;
|
||||
case ISCSI_PARAM_PDU_INORDER_EN:
|
||||
session->pdu_inorder_en = value;
|
||||
break;
|
||||
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
||||
session->dataseq_inorder_en = value;
|
||||
break;
|
||||
case ISCSI_PARAM_ERL:
|
||||
session->erl = value;
|
||||
break;
|
||||
case ISCSI_PARAM_IFMARKER_EN:
|
||||
if (value) {
|
||||
printk(KERN_ERR "IFMarker wasn't negotiated to No");
|
||||
return -EPROTO;
|
||||
}
|
||||
break;
|
||||
case ISCSI_PARAM_OFMARKER_EN:
|
||||
if (value) {
|
||||
printk(KERN_ERR "OFMarker wasn't negotiated to No");
|
||||
return -EPROTO;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_session_get_param(struct iscsi_cls_session *cls_session,
|
||||
enum iscsi_param param, uint32_t *value)
|
||||
{
|
||||
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
|
||||
struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
|
||||
|
||||
switch (param) {
|
||||
case ISCSI_PARAM_INITIAL_R2T_EN:
|
||||
*value = session->initial_r2t_en;
|
||||
break;
|
||||
case ISCSI_PARAM_MAX_R2T:
|
||||
*value = session->max_r2t;
|
||||
break;
|
||||
case ISCSI_PARAM_IMM_DATA_EN:
|
||||
*value = session->imm_data_en;
|
||||
break;
|
||||
case ISCSI_PARAM_FIRST_BURST:
|
||||
*value = session->first_burst;
|
||||
break;
|
||||
case ISCSI_PARAM_MAX_BURST:
|
||||
*value = session->max_burst;
|
||||
break;
|
||||
case ISCSI_PARAM_PDU_INORDER_EN:
|
||||
*value = session->pdu_inorder_en;
|
||||
break;
|
||||
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
||||
*value = session->dataseq_inorder_en;
|
||||
break;
|
||||
case ISCSI_PARAM_ERL:
|
||||
*value = session->erl;
|
||||
break;
|
||||
case ISCSI_PARAM_IFMARKER_EN:
|
||||
*value = 0;
|
||||
break;
|
||||
case ISCSI_PARAM_OFMARKER_EN:
|
||||
*value = 0;
|
||||
break;
|
||||
default:
|
||||
return ISCSI_ERR_PARAM_NOT_FOUND;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
||||
enum iscsi_param param, uint32_t *value)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
|
||||
switch(param) {
|
||||
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
||||
*value = conn->max_recv_dlength;
|
||||
break;
|
||||
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
||||
*value = conn->max_xmit_dlength;
|
||||
break;
|
||||
case ISCSI_PARAM_HDRDGST_EN:
|
||||
*value = 0;
|
||||
break;
|
||||
case ISCSI_PARAM_DATADGST_EN:
|
||||
*value = 0;
|
||||
break;
|
||||
/*case ISCSI_PARAM_TARGET_RECV_DLENGTH:
|
||||
*value = conn->target_recv_dlength;
|
||||
break;
|
||||
case ISCSI_PARAM_INITIATOR_RECV_DLENGTH:
|
||||
*value = conn->initiator_recv_dlength;
|
||||
break;*/
|
||||
default:
|
||||
return ISCSI_ERR_PARAM_NOT_FOUND;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
|
||||
{
|
||||
struct iscsi_conn *conn = cls_conn->dd_data;
|
||||
|
||||
stats->txdata_octets = conn->txdata_octets;
|
||||
stats->rxdata_octets = conn->rxdata_octets;
|
||||
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
|
||||
stats->dataout_pdus = conn->dataout_pdus_cnt;
|
||||
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
|
||||
stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
|
||||
stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
|
||||
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
|
||||
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
|
||||
stats->custom_length = 3;
|
||||
strcpy(stats->custom[0].desc, "qp_tx_queue_full");
|
||||
stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
|
||||
strcpy(stats->custom[1].desc, "fmr_map_not_avail");
|
||||
stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
|
||||
strcpy(stats->custom[2].desc, "eh_abort_cnt");
|
||||
stats->custom[2].value = conn->eh_abort_cnt;
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking,
|
||||
__u64 *ep_handle)
|
||||
{
|
||||
int err;
|
||||
struct iser_conn *ib_conn;
|
||||
|
||||
err = iser_conn_init(&ib_conn);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking);
|
||||
if (!err)
|
||||
*ep_handle = (__u64)(unsigned long)ib_conn;
|
||||
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int
|
||||
iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms)
|
||||
{
|
||||
struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
|
||||
int rc;
|
||||
|
||||
if (!ib_conn)
|
||||
return -EINVAL;
|
||||
|
||||
rc = wait_event_interruptible_timeout(ib_conn->wait,
|
||||
ib_conn->state == ISER_CONN_UP,
|
||||
msecs_to_jiffies(timeout_ms));
|
||||
|
||||
/* if conn establishment failed, return error code to iscsi */
|
||||
if (!rc &&
|
||||
(ib_conn->state == ISER_CONN_TERMINATING ||
|
||||
ib_conn->state == ISER_CONN_DOWN))
|
||||
rc = -1;
|
||||
|
||||
iser_err("ib conn %p rc = %d\n", ib_conn, rc);
|
||||
|
||||
if (rc > 0)
|
||||
return 1; /* success, this is the equivalent of POLLOUT */
|
||||
else if (!rc)
|
||||
return 0; /* timeout */
|
||||
else
|
||||
return rc; /* signal */
|
||||
}
|
||||
|
||||
static void
|
||||
iscsi_iser_ep_disconnect(__u64 ep_handle)
|
||||
{
|
||||
struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
|
||||
|
||||
if (!ib_conn)
|
||||
return;
|
||||
|
||||
iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
|
||||
|
||||
iser_conn_terminate(ib_conn);
|
||||
}
|
||||
|
||||
static struct scsi_host_template iscsi_iser_sht = {
|
||||
.name = "iSCSI Initiator over iSER, v." DRV_VER,
|
||||
.queuecommand = iscsi_queuecommand,
|
||||
.can_queue = ISCSI_XMIT_CMDS_MAX - 1,
|
||||
.sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
|
||||
.cmd_per_lun = ISCSI_MAX_CMD_PER_LUN,
|
||||
.eh_abort_handler = iscsi_eh_abort,
|
||||
.eh_host_reset_handler = iscsi_eh_host_reset,
|
||||
.use_clustering = DISABLE_CLUSTERING,
|
||||
.proc_name = "iscsi_iser",
|
||||
.this_id = -1,
|
||||
};
|
||||
|
||||
static struct iscsi_transport iscsi_iser_transport = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "iser",
|
||||
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
|
||||
.param_mask = ISCSI_MAX_RECV_DLENGTH |
|
||||
ISCSI_MAX_XMIT_DLENGTH |
|
||||
ISCSI_HDRDGST_EN |
|
||||
ISCSI_DATADGST_EN |
|
||||
ISCSI_INITIAL_R2T_EN |
|
||||
ISCSI_MAX_R2T |
|
||||
ISCSI_IMM_DATA_EN |
|
||||
ISCSI_FIRST_BURST |
|
||||
ISCSI_MAX_BURST |
|
||||
ISCSI_PDU_INORDER_EN |
|
||||
ISCSI_DATASEQ_INORDER_EN,
|
||||
.host_template = &iscsi_iser_sht,
|
||||
.conndata_size = sizeof(struct iscsi_conn),
|
||||
.max_lun = ISCSI_ISER_MAX_LUN,
|
||||
.max_cmd_len = ISCSI_ISER_MAX_CMD_LEN,
|
||||
/* session management */
|
||||
.create_session = iscsi_iser_session_create,
|
||||
.destroy_session = iscsi_session_teardown,
|
||||
/* connection management */
|
||||
.create_conn = iscsi_iser_conn_create,
|
||||
.bind_conn = iscsi_iser_conn_bind,
|
||||
.destroy_conn = iscsi_iser_conn_destroy,
|
||||
.set_param = iscsi_iser_conn_set_param,
|
||||
.get_conn_param = iscsi_iser_conn_get_param,
|
||||
.get_session_param = iscsi_iser_session_get_param,
|
||||
.start_conn = iscsi_iser_conn_start,
|
||||
.stop_conn = iscsi_conn_stop,
|
||||
/* these are called as part of conn recovery */
|
||||
.suspend_conn_recv = NULL, /* FIXME is/how this relvant to iser? */
|
||||
.terminate_conn = iscsi_iser_conn_terminate,
|
||||
/* IO */
|
||||
.send_pdu = iscsi_conn_send_pdu,
|
||||
.get_stats = iscsi_iser_conn_get_stats,
|
||||
.init_cmd_task = iscsi_iser_cmd_init,
|
||||
.xmit_cmd_task = iscsi_iser_ctask_xmit,
|
||||
.xmit_mgmt_task = iscsi_iser_mtask_xmit,
|
||||
.cleanup_cmd_task = iscsi_iser_cleanup_ctask,
|
||||
/* recovery */
|
||||
.session_recovery_timedout = iscsi_session_recovery_timedout,
|
||||
|
||||
.ep_connect = iscsi_iser_ep_connect,
|
||||
.ep_poll = iscsi_iser_ep_poll,
|
||||
.ep_disconnect = iscsi_iser_ep_disconnect
|
||||
};
|
||||
|
||||
static int __init iser_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
iser_dbg("Starting iSER datamover...\n");
|
||||
|
||||
if (iscsi_max_lun < 1) {
|
||||
printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
iscsi_iser_transport.max_lun = iscsi_max_lun;
|
||||
|
||||
memset(&ig, 0, sizeof(struct iser_global));
|
||||
|
||||
ig.desc_cache = kmem_cache_create("iser_descriptors",
|
||||
sizeof (struct iser_desc),
|
||||
0, SLAB_HWCACHE_ALIGN,
|
||||
NULL, NULL);
|
||||
if (ig.desc_cache == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
/* device init is called only after the first addr resolution */
|
||||
mutex_init(&ig.device_list_mutex);
|
||||
INIT_LIST_HEAD(&ig.device_list);
|
||||
mutex_init(&ig.connlist_mutex);
|
||||
INIT_LIST_HEAD(&ig.connlist);
|
||||
|
||||
if (!iscsi_register_transport(&iscsi_iser_transport)) {
|
||||
iser_err("iscsi_register_transport failed\n");
|
||||
err = -EINVAL;
|
||||
goto register_transport_failure;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
register_transport_failure:
|
||||
kmem_cache_destroy(ig.desc_cache);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit iser_exit(void)
|
||||
{
|
||||
iser_dbg("Removing iSER datamover...\n");
|
||||
iscsi_unregister_transport(&iscsi_iser_transport);
|
||||
kmem_cache_destroy(ig.desc_cache);
|
||||
}
|
||||
|
||||
module_init(iser_init);
|
||||
module_exit(iser_exit);
|
||||
|
|
@ -0,0 +1,354 @@
|
|||
/*
|
||||
* iSER transport for the Open iSCSI Initiator & iSER transport internals
|
||||
*
|
||||
* Copyright (C) 2004 Dmitry Yusupov
|
||||
* Copyright (C) 2004 Alex Aizman
|
||||
* Copyright (C) 2005 Mike Christie
|
||||
* based on code maintained by open-iscsi@googlegroups.com
|
||||
*
|
||||
* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
|
||||
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
|
||||
*
|
||||
* This software is available to you under a choice of one of two
|
||||
* licenses. You may choose to be licensed under the terms of the GNU
|
||||
* General Public License (GPL) Version 2, available from the file
|
||||
* COPYING in the main directory of this source tree, or the
|
||||
* OpenIB.org BSD license below:
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or
|
||||
* without modification, are permitted provided that the following
|
||||
* conditions are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer.
|
||||
*
|
||||
* - Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials
|
||||
* provided with the distribution.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*
|
||||
* $Id: iscsi_iser.h 7051 2006-05-10 12:29:11Z ogerlitz $
|
||||
*/
|
||||
#ifndef __ISCSI_ISER_H__
|
||||
#define __ISCSI_ISER_H__
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/net.h>
|
||||
#include <scsi/libiscsi.h>
|
||||
#include <scsi/scsi_transport_iscsi.h>
|
||||
|
||||
#include <linux/wait.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/dma-mapping.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/mempool.h>
|
||||
#include <linux/uio.h>
|
||||
|
||||
#include <linux/socket.h>
|
||||
#include <linux/in.h>
|
||||
#include <linux/in6.h>
|
||||
|
||||
#include <rdma/ib_verbs.h>
|
||||
#include <rdma/ib_fmr_pool.h>
|
||||
#include <rdma/rdma_cm.h>
|
||||
|
||||
#define DRV_NAME "iser"
|
||||
#define PFX DRV_NAME ": "
|
||||
#define DRV_VER "0.1"
|
||||
#define DRV_DATE "May 7th, 2006"
|
||||
|
||||
#define iser_dbg(fmt, arg...) \
|
||||
do { \
|
||||
if (iser_debug_level > 0) \
|
||||
printk(KERN_DEBUG PFX "%s:" fmt,\
|
||||
__func__ , ## arg); \
|
||||
} while (0)
|
||||
|
||||
#define iser_err(fmt, arg...) \
|
||||
do { \
|
||||
printk(KERN_ERR PFX "%s:" fmt, \
|
||||
__func__ , ## arg); \
|
||||
} while (0)
|
||||
|
||||
/* support upto 512KB in one RDMA */
|
||||
#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> PAGE_SHIFT)
|
||||
#define ISCSI_ISER_MAX_LUN 256
|
||||
#define ISCSI_ISER_MAX_CMD_LEN 16
|
||||
|
||||
/* QP settings */
|
||||
/* Maximal bounds on received asynchronous PDUs */
|
||||
#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
|
||||
|
||||
#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
|
||||
* SCSI_TMFUNC(2), LOGOUT(1) */
|
||||
|
||||
#define ISER_QP_MAX_RECV_DTOS (ISCSI_XMIT_CMDS_MAX + \
|
||||
ISER_MAX_RX_MISC_PDUS + \
|
||||
ISER_MAX_TX_MISC_PDUS)
|
||||
|
||||
/* the max TX (send) WR supported by the iSER QP is defined by *
|
||||
* max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
|
||||
* to have at max for SCSI command. The tx posting & completion handling code *
|
||||
* supports -EAGAIN scheme where tx is suspended till the QP has room for more *
|
||||
* send WR. D=8 comes from 64K/8K */
|
||||
|
||||
#define ISER_INFLIGHT_DATAOUTS 8
|
||||
|
||||
#define ISER_QP_MAX_REQ_DTOS (ISCSI_XMIT_CMDS_MAX * \
|
||||
(1 + ISER_INFLIGHT_DATAOUTS) + \
|
||||
ISER_MAX_TX_MISC_PDUS + \
|
||||
ISER_MAX_RX_MISC_PDUS)
|
||||
|
||||
#define ISER_VER 0x10
|
||||
#define ISER_WSV 0x08
|
||||
#define ISER_RSV 0x04
|
||||
|
||||
struct iser_hdr {
|
||||
u8 flags;
|
||||
u8 rsvd[3];
|
||||
__be32 write_stag; /* write rkey */
|
||||
__be64 write_va;
|
||||
__be32 read_stag; /* read rkey */
|
||||
__be64 read_va;
|
||||
} __attribute__((packed));
|
||||
|
||||
|
||||
/* Length of an object name string */
|
||||
#define ISER_OBJECT_NAME_SIZE 64
|
||||
|
||||
enum iser_ib_conn_state {
|
||||
ISER_CONN_INIT, /* descriptor allocd, no conn */
|
||||
ISER_CONN_PENDING, /* in the process of being established */
|
||||
ISER_CONN_UP, /* up and running */
|
||||
ISER_CONN_TERMINATING, /* in the process of being terminated */
|
||||
ISER_CONN_DOWN, /* shut down */
|
||||
ISER_CONN_STATES_NUM
|
||||
};
|
||||
|
||||
enum iser_task_status {
|
||||
ISER_TASK_STATUS_INIT = 0,
|
||||
ISER_TASK_STATUS_STARTED,
|
||||
ISER_TASK_STATUS_COMPLETED
|
||||
};
|
||||
|
||||
enum iser_data_dir {
|
||||
ISER_DIR_IN = 0, /* to initiator */
|
||||
ISER_DIR_OUT, /* from initiator */
|
||||
ISER_DIRS_NUM
|
||||
};
|
||||
|
||||
struct iser_data_buf {
|
||||
void *buf; /* pointer to the sg list */
|
||||
unsigned int size; /* num entries of this sg */
|
||||
unsigned long data_len; /* total data len */
|
||||
unsigned int dma_nents; /* returned by dma_map_sg */
|
||||
char *copy_buf; /* allocated copy buf for SGs unaligned *
|
||||
* for rdma which are copied */
|
||||
struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
|
||||
* unaligned SG */
|
||||
};
|
||||
|
||||
/* fwd declarations */
|
||||
struct iser_device;
|
||||
struct iscsi_iser_conn;
|
||||
struct iscsi_iser_cmd_task;
|
||||
|
||||
struct iser_mem_reg {
|
||||
u32 lkey;
|
||||
u32 rkey;
|
||||
u64 va;
|
||||
u64 len;
|
||||
void *mem_h;
|
||||
};
|
||||
|
||||
struct iser_regd_buf {
|
||||
struct iser_mem_reg reg; /* memory registration info */
|
||||
void *virt_addr;
|
||||
struct iser_device *device; /* device->device for dma_unmap */
|
||||
dma_addr_t dma_addr; /* if non zero, addr for dma_unmap */
|
||||
enum dma_data_direction direction; /* direction for dma_unmap */
|
||||
unsigned int data_size;
|
||||
atomic_t ref_count; /* refcount, freed when dec to 0 */
|
||||
};
|
||||
|
||||
#define MAX_REGD_BUF_VECTOR_LEN 2
|
||||
|
||||
struct iser_dto {
|
||||
struct iscsi_iser_cmd_task *ctask;
|
||||
struct iscsi_iser_conn *conn;
|
||||
int notify_enable;
|
||||
|
||||
/* vector of registered buffers */
|
||||
unsigned int regd_vector_len;
|
||||
struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
|
||||
|
||||
/* offset into the registered buffer may be specified */
|
||||
unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
|
||||
|
||||
/* a smaller size may be specified, if 0, then full size is used */
|
||||
unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
|
||||
};
|
||||
|
||||
enum iser_desc_type {
|
||||
ISCSI_RX,
|
||||
ISCSI_TX_CONTROL ,
|
||||
ISCSI_TX_SCSI_COMMAND,
|
||||
ISCSI_TX_DATAOUT
|
||||
};
|
||||
|
||||
struct iser_desc {
|
||||
struct iser_hdr iser_header;
|
||||
struct iscsi_hdr iscsi_header;
|
||||
struct iser_regd_buf hdr_regd_buf;
|
||||
void *data; /* used by RX & TX_CONTROL */
|
||||
struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
|
||||
enum iser_desc_type type;
|
||||
struct iser_dto dto;
|
||||
};
|
||||
|
||||
struct iser_device {
|
||||
struct ib_device *ib_device;
|
||||
struct ib_pd *pd;
|
||||
struct ib_cq *cq;
|
||||
struct ib_mr *mr;
|
||||
struct tasklet_struct cq_tasklet;
|
||||
struct list_head ig_list; /* entry in ig devices list */
|
||||
int refcount;
|
||||
};
|
||||
|
||||
struct iser_conn {
|
||||
struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
|
||||
enum iser_ib_conn_state state; /* rdma connection state */
|
||||
spinlock_t lock; /* used for state changes */
|
||||
struct iser_device *device; /* device context */
|
||||
struct rdma_cm_id *cma_id; /* CMA ID */
|
||||
struct ib_qp *qp; /* QP */
|
||||
struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
|
||||
int disc_evt_flag; /* disconn event delivered */
|
||||
wait_queue_head_t wait; /* waitq for conn/disconn */
|
||||
atomic_t post_recv_buf_count; /* posted rx count */
|
||||
atomic_t post_send_buf_count; /* posted tx count */
|
||||
struct work_struct comperror_work; /* conn term sleepable ctx*/
|
||||
char name[ISER_OBJECT_NAME_SIZE];
|
||||
struct iser_page_vec *page_vec; /* represents SG to fmr maps*
|
||||
* maps serialized as tx is*/
|
||||
struct list_head conn_list; /* entry in ig conn list */
|
||||
};
|
||||
|
||||
struct iscsi_iser_conn {
|
||||
struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
|
||||
struct iser_conn *ib_conn; /* iSER IB conn */
|
||||
|
||||
rwlock_t lock;
|
||||
};
|
||||
|
||||
struct iscsi_iser_cmd_task {
|
||||
struct iser_desc desc;
|
||||
struct iscsi_iser_conn *iser_conn;
|
||||
int rdma_data_count;/* RDMA bytes */
|
||||
enum iser_task_status status;
|
||||
int command_sent; /* set if command sent */
|
||||
int dir[ISER_DIRS_NUM]; /* set if dir use*/
|
||||
struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
|
||||
struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
|
||||
struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
|
||||
};
|
||||
|
||||
struct iser_page_vec {
|
||||
u64 *pages;
|
||||
int length;
|
||||
int offset;
|
||||
int data_size;
|
||||
};
|
||||
|
||||
struct iser_global {
|
||||
struct mutex device_list_mutex;/* */
|
||||
struct list_head device_list; /* all iSER devices */
|
||||
struct mutex connlist_mutex;
|
||||
struct list_head connlist; /* all iSER IB connections */
|
||||
|
||||
kmem_cache_t *desc_cache;
|
||||
};
|
||||
|
||||
extern struct iser_global ig;
|
||||
extern int iser_debug_level;
|
||||
|
||||
/* allocate connection resources needed for rdma functionality */
|
||||
int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
|
||||
|
||||
int iser_send_control(struct iscsi_conn *conn,
|
||||
struct iscsi_mgmt_task *mtask);
|
||||
|
||||
int iser_send_command(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask);
|
||||
|
||||
int iser_send_data_out(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask,
|
||||
struct iscsi_data *hdr);
|
||||
|
||||
void iscsi_iser_recv(struct iscsi_conn *conn,
|
||||
struct iscsi_hdr *hdr,
|
||||
char *rx_data,
|
||||
int rx_data_len);
|
||||
|
||||
int iser_conn_init(struct iser_conn **ib_conn);
|
||||
|
||||
void iser_conn_terminate(struct iser_conn *ib_conn);
|
||||
|
||||
void iser_conn_release(struct iser_conn *ib_conn);
|
||||
|
||||
void iser_rcv_completion(struct iser_desc *desc,
|
||||
unsigned long dto_xfer_len);
|
||||
|
||||
void iser_snd_completion(struct iser_desc *desc);
|
||||
|
||||
void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *ctask);
|
||||
|
||||
void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *ctask);
|
||||
|
||||
void iser_dto_buffs_release(struct iser_dto *dto);
|
||||
|
||||
int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
|
||||
|
||||
void iser_reg_single(struct iser_device *device,
|
||||
struct iser_regd_buf *regd_buf,
|
||||
enum dma_data_direction direction);
|
||||
|
||||
int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
|
||||
enum iser_data_dir cmd_dir);
|
||||
|
||||
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
|
||||
enum iser_data_dir cmd_dir);
|
||||
|
||||
int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *ctask,
|
||||
enum iser_data_dir cmd_dir);
|
||||
|
||||
int iser_connect(struct iser_conn *ib_conn,
|
||||
struct sockaddr_in *src_addr,
|
||||
struct sockaddr_in *dst_addr,
|
||||
int non_blocking);
|
||||
|
||||
int iser_reg_page_vec(struct iser_conn *ib_conn,
|
||||
struct iser_page_vec *page_vec,
|
||||
struct iser_mem_reg *mem_reg);
|
||||
|
||||
void iser_unreg_mem(struct iser_mem_reg *mem_reg);
|
||||
|
||||
int iser_post_recv(struct iser_desc *rx_desc);
|
||||
int iser_post_send(struct iser_desc *tx_desc);
|
||||
|
||||
int iser_conn_state_comp(struct iser_conn *ib_conn,
|
||||
enum iser_ib_conn_state comp);
|
||||
#endif
|
||||
|
|
@ -0,0 +1,738 @@
|
|||
/*
|
||||
* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
|
||||
*
|
||||
* This software is available to you under a choice of one of two
|
||||
* licenses. You may choose to be licensed under the terms of the GNU
|
||||
* General Public License (GPL) Version 2, available from the file
|
||||
* COPYING in the main directory of this source tree, or the
|
||||
* OpenIB.org BSD license below:
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or
|
||||
* without modification, are permitted provided that the following
|
||||
* conditions are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer.
|
||||
*
|
||||
* - Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials
|
||||
* provided with the distribution.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*
|
||||
* $Id: iser_initiator.c 6964 2006-05-07 11:11:43Z ogerlitz $
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/mm.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/scatterlist.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <linux/kfifo.h>
|
||||
#include <scsi/scsi_cmnd.h>
|
||||
#include <scsi/scsi_host.h>
|
||||
|
||||
#include "iscsi_iser.h"
|
||||
|
||||
/* Constant PDU lengths calculations */
|
||||
#define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \
|
||||
sizeof (struct iscsi_hdr))
|
||||
|
||||
/* iser_dto_add_regd_buff - increments the reference count for *
|
||||
* the registered buffer & adds it to the DTO object */
|
||||
static void iser_dto_add_regd_buff(struct iser_dto *dto,
|
||||
struct iser_regd_buf *regd_buf,
|
||||
unsigned long use_offset,
|
||||
unsigned long use_size)
|
||||
{
|
||||
int add_idx;
|
||||
|
||||
atomic_inc(®d_buf->ref_count);
|
||||
|
||||
add_idx = dto->regd_vector_len;
|
||||
dto->regd[add_idx] = regd_buf;
|
||||
dto->used_sz[add_idx] = use_size;
|
||||
dto->offset[add_idx] = use_offset;
|
||||
|
||||
dto->regd_vector_len++;
|
||||
}
|
||||
|
||||
static int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
|
||||
struct iser_data_buf *data,
|
||||
enum iser_data_dir iser_dir,
|
||||
enum dma_data_direction dma_dir)
|
||||
{
|
||||
struct device *dma_device;
|
||||
|
||||
iser_ctask->dir[iser_dir] = 1;
|
||||
dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
|
||||
|
||||
data->dma_nents = dma_map_sg(dma_device, data->buf, data->size, dma_dir);
|
||||
if (data->dma_nents == 0) {
|
||||
iser_err("dma_map_sg failed!!!\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask)
|
||||
{
|
||||
struct device *dma_device;
|
||||
struct iser_data_buf *data;
|
||||
|
||||
dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
|
||||
|
||||
if (iser_ctask->dir[ISER_DIR_IN]) {
|
||||
data = &iser_ctask->data[ISER_DIR_IN];
|
||||
dma_unmap_sg(dma_device, data->buf, data->size, DMA_FROM_DEVICE);
|
||||
}
|
||||
|
||||
if (iser_ctask->dir[ISER_DIR_OUT]) {
|
||||
data = &iser_ctask->data[ISER_DIR_OUT];
|
||||
dma_unmap_sg(dma_device, data->buf, data->size, DMA_TO_DEVICE);
|
||||
}
|
||||
}
|
||||
|
||||
/* Register user buffer memory and initialize passive rdma
|
||||
* dto descriptor. Total data size is stored in
|
||||
* iser_ctask->data[ISER_DIR_IN].data_len
|
||||
*/
|
||||
static int iser_prepare_read_cmd(struct iscsi_cmd_task *ctask,
|
||||
unsigned int edtl)
|
||||
|
||||
{
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
struct iser_regd_buf *regd_buf;
|
||||
int err;
|
||||
struct iser_hdr *hdr = &iser_ctask->desc.iser_header;
|
||||
struct iser_data_buf *buf_in = &iser_ctask->data[ISER_DIR_IN];
|
||||
|
||||
err = iser_dma_map_task_data(iser_ctask,
|
||||
buf_in,
|
||||
ISER_DIR_IN,
|
||||
DMA_FROM_DEVICE);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (edtl > iser_ctask->data[ISER_DIR_IN].data_len) {
|
||||
iser_err("Total data length: %ld, less than EDTL: "
|
||||
"%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
|
||||
iser_ctask->data[ISER_DIR_IN].data_len, edtl,
|
||||
ctask->itt, iser_ctask->iser_conn);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_IN);
|
||||
if (err) {
|
||||
iser_err("Failed to set up Data-IN RDMA\n");
|
||||
return err;
|
||||
}
|
||||
regd_buf = &iser_ctask->rdma_regd[ISER_DIR_IN];
|
||||
|
||||
hdr->flags |= ISER_RSV;
|
||||
hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
|
||||
hdr->read_va = cpu_to_be64(regd_buf->reg.va);
|
||||
|
||||
iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
|
||||
ctask->itt, regd_buf->reg.rkey,
|
||||
(unsigned long long)regd_buf->reg.va);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Register user buffer memory and initialize passive rdma
|
||||
* dto descriptor. Total data size is stored in
|
||||
* ctask->data[ISER_DIR_OUT].data_len
|
||||
*/
|
||||
static int
|
||||
iser_prepare_write_cmd(struct iscsi_cmd_task *ctask,
|
||||
unsigned int imm_sz,
|
||||
unsigned int unsol_sz,
|
||||
unsigned int edtl)
|
||||
{
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
struct iser_regd_buf *regd_buf;
|
||||
int err;
|
||||
struct iser_dto *send_dto = &iser_ctask->desc.dto;
|
||||
struct iser_hdr *hdr = &iser_ctask->desc.iser_header;
|
||||
struct iser_data_buf *buf_out = &iser_ctask->data[ISER_DIR_OUT];
|
||||
|
||||
err = iser_dma_map_task_data(iser_ctask,
|
||||
buf_out,
|
||||
ISER_DIR_OUT,
|
||||
DMA_TO_DEVICE);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (edtl > iser_ctask->data[ISER_DIR_OUT].data_len) {
|
||||
iser_err("Total data length: %ld, less than EDTL: %d, "
|
||||
"in WRITE cmd BHS itt: %d, conn: 0x%p\n",
|
||||
iser_ctask->data[ISER_DIR_OUT].data_len,
|
||||
edtl, ctask->itt, ctask->conn);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_OUT);
|
||||
if (err != 0) {
|
||||
iser_err("Failed to register write cmd RDMA mem\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
regd_buf = &iser_ctask->rdma_regd[ISER_DIR_OUT];
|
||||
|
||||
if (unsol_sz < edtl) {
|
||||
hdr->flags |= ISER_WSV;
|
||||
hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
|
||||
hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz);
|
||||
|
||||
iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
|
||||
"VA:%#llX + unsol:%d\n",
|
||||
ctask->itt, regd_buf->reg.rkey,
|
||||
(unsigned long long)regd_buf->reg.va, unsol_sz);
|
||||
}
|
||||
|
||||
if (imm_sz > 0) {
|
||||
iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
|
||||
ctask->itt, imm_sz);
|
||||
iser_dto_add_regd_buff(send_dto,
|
||||
regd_buf,
|
||||
0,
|
||||
imm_sz);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_post_receive_control - allocates, initializes and posts receive DTO.
|
||||
*/
|
||||
static int iser_post_receive_control(struct iscsi_conn *conn)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iser_desc *rx_desc;
|
||||
struct iser_regd_buf *regd_hdr;
|
||||
struct iser_regd_buf *regd_data;
|
||||
struct iser_dto *recv_dto = NULL;
|
||||
struct iser_device *device = iser_conn->ib_conn->device;
|
||||
int rx_data_size, err = 0;
|
||||
|
||||
rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
|
||||
if (rx_desc == NULL) {
|
||||
iser_err("Failed to alloc desc for post recv\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
rx_desc->type = ISCSI_RX;
|
||||
|
||||
/* for the login sequence we must support rx of upto 8K; login is done
|
||||
* after conn create/bind (connect) and conn stop/bind (reconnect),
|
||||
* what's common for both schemes is that the connection is not started
|
||||
*/
|
||||
if (conn->c_stage != ISCSI_CONN_STARTED)
|
||||
rx_data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
|
||||
else /* FIXME till user space sets conn->max_recv_dlength correctly */
|
||||
rx_data_size = 128;
|
||||
|
||||
rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
|
||||
if (rx_desc->data == NULL) {
|
||||
iser_err("Failed to alloc data buf for post recv\n");
|
||||
err = -ENOMEM;
|
||||
goto post_rx_kmalloc_failure;
|
||||
}
|
||||
|
||||
recv_dto = &rx_desc->dto;
|
||||
recv_dto->conn = iser_conn;
|
||||
recv_dto->regd_vector_len = 0;
|
||||
|
||||
regd_hdr = &rx_desc->hdr_regd_buf;
|
||||
memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
|
||||
regd_hdr->device = device;
|
||||
regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
|
||||
regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
|
||||
|
||||
iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
|
||||
|
||||
iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
|
||||
|
||||
regd_data = &rx_desc->data_regd_buf;
|
||||
memset(regd_data, 0, sizeof(struct iser_regd_buf));
|
||||
regd_data->device = device;
|
||||
regd_data->virt_addr = rx_desc->data;
|
||||
regd_data->data_size = rx_data_size;
|
||||
|
||||
iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
|
||||
|
||||
iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
|
||||
|
||||
err = iser_post_recv(rx_desc);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
/* iser_post_recv failed */
|
||||
iser_dto_buffs_release(recv_dto);
|
||||
kfree(rx_desc->data);
|
||||
post_rx_kmalloc_failure:
|
||||
kmem_cache_free(ig.desc_cache, rx_desc);
|
||||
return err;
|
||||
}
|
||||
|
||||
/* creates a new tx descriptor and adds header regd buffer */
|
||||
static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
|
||||
struct iser_desc *tx_desc)
|
||||
{
|
||||
struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf;
|
||||
struct iser_dto *send_dto = &tx_desc->dto;
|
||||
|
||||
memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
|
||||
regd_hdr->device = iser_conn->ib_conn->device;
|
||||
regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */
|
||||
regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
|
||||
|
||||
send_dto->conn = iser_conn;
|
||||
send_dto->notify_enable = 1;
|
||||
send_dto->regd_vector_len = 0;
|
||||
|
||||
memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
|
||||
tx_desc->iser_header.flags = ISER_VER;
|
||||
|
||||
iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0);
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_conn_set_full_featured_mode - (iSER API)
|
||||
*/
|
||||
int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
|
||||
int i;
|
||||
/* no need to keep it in a var, we are after login so if this should
|
||||
* be negotiated, by now the result should be available here */
|
||||
int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
|
||||
|
||||
iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
|
||||
|
||||
/* Check that there is no posted recv or send buffers left - */
|
||||
/* they must be consumed during the login phase */
|
||||
BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
|
||||
BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
|
||||
|
||||
/* Initial post receive buffers */
|
||||
for (i = 0; i < initial_post_recv_bufs_num; i++) {
|
||||
if (iser_post_receive_control(conn) != 0) {
|
||||
iser_err("Failed to post recv bufs at:%d conn:0x%p\n",
|
||||
i, conn);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
iser_check_xmit(struct iscsi_conn *conn, void *task)
|
||||
{
|
||||
int rc = 0;
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
|
||||
write_lock_bh(conn->recv_lock);
|
||||
if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
|
||||
ISER_QP_MAX_REQ_DTOS) {
|
||||
iser_dbg("%ld can't xmit task %p, suspending tx\n",jiffies,task);
|
||||
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
||||
rc = -EAGAIN;
|
||||
}
|
||||
write_unlock_bh(conn->recv_lock);
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* iser_send_command - send command PDU
|
||||
*/
|
||||
int iser_send_command(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
struct iser_dto *send_dto = NULL;
|
||||
unsigned long edtl;
|
||||
int err = 0;
|
||||
struct iser_data_buf *data_buf;
|
||||
|
||||
struct iscsi_cmd *hdr = ctask->hdr;
|
||||
struct scsi_cmnd *sc = ctask->sc;
|
||||
|
||||
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
|
||||
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
|
||||
return -EPERM;
|
||||
}
|
||||
if (iser_check_xmit(conn, ctask))
|
||||
return -EAGAIN;
|
||||
|
||||
edtl = ntohl(hdr->data_length);
|
||||
|
||||
/* build the tx desc regd header and add it to the tx desc dto */
|
||||
iser_ctask->desc.type = ISCSI_TX_SCSI_COMMAND;
|
||||
send_dto = &iser_ctask->desc.dto;
|
||||
send_dto->ctask = iser_ctask;
|
||||
iser_create_send_desc(iser_conn, &iser_ctask->desc);
|
||||
|
||||
if (hdr->flags & ISCSI_FLAG_CMD_READ)
|
||||
data_buf = &iser_ctask->data[ISER_DIR_IN];
|
||||
else
|
||||
data_buf = &iser_ctask->data[ISER_DIR_OUT];
|
||||
|
||||
if (sc->use_sg) { /* using a scatter list */
|
||||
data_buf->buf = sc->request_buffer;
|
||||
data_buf->size = sc->use_sg;
|
||||
} else if (sc->request_bufflen) {
|
||||
/* using a single buffer - convert it into one entry SG */
|
||||
sg_init_one(&data_buf->sg_single,
|
||||
sc->request_buffer, sc->request_bufflen);
|
||||
data_buf->buf = &data_buf->sg_single;
|
||||
data_buf->size = 1;
|
||||
}
|
||||
|
||||
data_buf->data_len = sc->request_bufflen;
|
||||
|
||||
if (hdr->flags & ISCSI_FLAG_CMD_READ) {
|
||||
err = iser_prepare_read_cmd(ctask, edtl);
|
||||
if (err)
|
||||
goto send_command_error;
|
||||
}
|
||||
if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
|
||||
err = iser_prepare_write_cmd(ctask,
|
||||
ctask->imm_count,
|
||||
ctask->imm_count +
|
||||
ctask->unsol_count,
|
||||
edtl);
|
||||
if (err)
|
||||
goto send_command_error;
|
||||
}
|
||||
|
||||
iser_reg_single(iser_conn->ib_conn->device,
|
||||
send_dto->regd[0], DMA_TO_DEVICE);
|
||||
|
||||
if (iser_post_receive_control(conn) != 0) {
|
||||
iser_err("post_recv failed!\n");
|
||||
err = -ENOMEM;
|
||||
goto send_command_error;
|
||||
}
|
||||
|
||||
iser_ctask->status = ISER_TASK_STATUS_STARTED;
|
||||
|
||||
err = iser_post_send(&iser_ctask->desc);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
send_command_error:
|
||||
iser_dto_buffs_release(send_dto);
|
||||
iser_err("conn %p failed ctask->itt %d err %d\n",conn, ctask->itt, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_send_data_out - send data out PDU
|
||||
*/
|
||||
int iser_send_data_out(struct iscsi_conn *conn,
|
||||
struct iscsi_cmd_task *ctask,
|
||||
struct iscsi_data *hdr)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
|
||||
struct iser_desc *tx_desc = NULL;
|
||||
struct iser_dto *send_dto = NULL;
|
||||
unsigned long buf_offset;
|
||||
unsigned long data_seg_len;
|
||||
unsigned int itt;
|
||||
int err = 0;
|
||||
|
||||
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
|
||||
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
if (iser_check_xmit(conn, ctask))
|
||||
return -EAGAIN;
|
||||
|
||||
itt = ntohl(hdr->itt);
|
||||
data_seg_len = ntoh24(hdr->dlength);
|
||||
buf_offset = ntohl(hdr->offset);
|
||||
|
||||
iser_dbg("%s itt %d dseg_len %d offset %d\n",
|
||||
__func__,(int)itt,(int)data_seg_len,(int)buf_offset);
|
||||
|
||||
tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
|
||||
if (tx_desc == NULL) {
|
||||
iser_err("Failed to alloc desc for post dataout\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
tx_desc->type = ISCSI_TX_DATAOUT;
|
||||
memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
|
||||
|
||||
/* build the tx desc regd header and add it to the tx desc dto */
|
||||
send_dto = &tx_desc->dto;
|
||||
send_dto->ctask = iser_ctask;
|
||||
iser_create_send_desc(iser_conn, tx_desc);
|
||||
|
||||
iser_reg_single(iser_conn->ib_conn->device,
|
||||
send_dto->regd[0], DMA_TO_DEVICE);
|
||||
|
||||
/* all data was registered for RDMA, we can use the lkey */
|
||||
iser_dto_add_regd_buff(send_dto,
|
||||
&iser_ctask->rdma_regd[ISER_DIR_OUT],
|
||||
buf_offset,
|
||||
data_seg_len);
|
||||
|
||||
if (buf_offset + data_seg_len > iser_ctask->data[ISER_DIR_OUT].data_len) {
|
||||
iser_err("Offset:%ld & DSL:%ld in Data-Out "
|
||||
"inconsistent with total len:%ld, itt:%d\n",
|
||||
buf_offset, data_seg_len,
|
||||
iser_ctask->data[ISER_DIR_OUT].data_len, itt);
|
||||
err = -EINVAL;
|
||||
goto send_data_out_error;
|
||||
}
|
||||
iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
|
||||
itt, buf_offset, data_seg_len);
|
||||
|
||||
|
||||
err = iser_post_send(tx_desc);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
send_data_out_error:
|
||||
iser_dto_buffs_release(send_dto);
|
||||
kmem_cache_free(ig.desc_cache, tx_desc);
|
||||
iser_err("conn %p failed err %d\n",conn, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
int iser_send_control(struct iscsi_conn *conn,
|
||||
struct iscsi_mgmt_task *mtask)
|
||||
{
|
||||
struct iscsi_iser_conn *iser_conn = conn->dd_data;
|
||||
struct iser_desc *mdesc = mtask->dd_data;
|
||||
struct iser_dto *send_dto = NULL;
|
||||
unsigned int itt;
|
||||
unsigned long data_seg_len;
|
||||
int err = 0;
|
||||
unsigned char opcode;
|
||||
struct iser_regd_buf *regd_buf;
|
||||
struct iser_device *device;
|
||||
|
||||
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
|
||||
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
if (iser_check_xmit(conn,mtask))
|
||||
return -EAGAIN;
|
||||
|
||||
/* build the tx desc regd header and add it to the tx desc dto */
|
||||
mdesc->type = ISCSI_TX_CONTROL;
|
||||
send_dto = &mdesc->dto;
|
||||
send_dto->ctask = NULL;
|
||||
iser_create_send_desc(iser_conn, mdesc);
|
||||
|
||||
device = iser_conn->ib_conn->device;
|
||||
|
||||
iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE);
|
||||
|
||||
itt = ntohl(mtask->hdr->itt);
|
||||
opcode = mtask->hdr->opcode & ISCSI_OPCODE_MASK;
|
||||
data_seg_len = ntoh24(mtask->hdr->dlength);
|
||||
|
||||
if (data_seg_len > 0) {
|
||||
regd_buf = &mdesc->data_regd_buf;
|
||||
memset(regd_buf, 0, sizeof(struct iser_regd_buf));
|
||||
regd_buf->device = device;
|
||||
regd_buf->virt_addr = mtask->data;
|
||||
regd_buf->data_size = mtask->data_count;
|
||||
iser_reg_single(device, regd_buf,
|
||||
DMA_TO_DEVICE);
|
||||
iser_dto_add_regd_buff(send_dto, regd_buf,
|
||||
0,
|
||||
data_seg_len);
|
||||
}
|
||||
|
||||
if (iser_post_receive_control(conn) != 0) {
|
||||
iser_err("post_rcv_buff failed!\n");
|
||||
err = -ENOMEM;
|
||||
goto send_control_error;
|
||||
}
|
||||
|
||||
err = iser_post_send(mdesc);
|
||||
if (!err)
|
||||
return 0;
|
||||
|
||||
send_control_error:
|
||||
iser_dto_buffs_release(send_dto);
|
||||
iser_err("conn %p failed err %d\n",conn, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_rcv_dto_completion - recv DTO completion
|
||||
*/
|
||||
void iser_rcv_completion(struct iser_desc *rx_desc,
|
||||
unsigned long dto_xfer_len)
|
||||
{
|
||||
struct iser_dto *dto = &rx_desc->dto;
|
||||
struct iscsi_iser_conn *conn = dto->conn;
|
||||
struct iscsi_session *session = conn->iscsi_conn->session;
|
||||
struct iscsi_cmd_task *ctask;
|
||||
struct iscsi_iser_cmd_task *iser_ctask;
|
||||
struct iscsi_hdr *hdr;
|
||||
char *rx_data = NULL;
|
||||
int rx_data_len = 0;
|
||||
unsigned int itt;
|
||||
unsigned char opcode;
|
||||
|
||||
hdr = &rx_desc->iscsi_header;
|
||||
|
||||
iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
|
||||
|
||||
if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */
|
||||
rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN;
|
||||
rx_data = dto->regd[1]->virt_addr;
|
||||
rx_data += dto->offset[1];
|
||||
}
|
||||
|
||||
opcode = hdr->opcode & ISCSI_OPCODE_MASK;
|
||||
|
||||
if (opcode == ISCSI_OP_SCSI_CMD_RSP) {
|
||||
itt = hdr->itt & ISCSI_ITT_MASK; /* mask out cid and age bits */
|
||||
if (!(itt < session->cmds_max))
|
||||
iser_err("itt can't be matched to task!!!"
|
||||
"conn %p opcode %d cmds_max %d itt %d\n",
|
||||
conn->iscsi_conn,opcode,session->cmds_max,itt);
|
||||
/* use the mapping given with the cmds array indexed by itt */
|
||||
ctask = (struct iscsi_cmd_task *)session->cmds[itt];
|
||||
iser_ctask = ctask->dd_data;
|
||||
iser_dbg("itt %d ctask %p\n",itt,ctask);
|
||||
iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
|
||||
iser_ctask_rdma_finalize(iser_ctask);
|
||||
}
|
||||
|
||||
iser_dto_buffs_release(dto);
|
||||
|
||||
iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len);
|
||||
|
||||
kfree(rx_desc->data);
|
||||
kmem_cache_free(ig.desc_cache, rx_desc);
|
||||
|
||||
/* decrementing conn->post_recv_buf_count only --after-- freeing the *
|
||||
* task eliminates the need to worry on tasks which are completed in *
|
||||
* parallel to the execution of iser_conn_term. So the code that waits *
|
||||
* for the posted rx bufs refcount to become zero handles everything */
|
||||
atomic_dec(&conn->ib_conn->post_recv_buf_count);
|
||||
}
|
||||
|
||||
void iser_snd_completion(struct iser_desc *tx_desc)
|
||||
{
|
||||
struct iser_dto *dto = &tx_desc->dto;
|
||||
struct iscsi_iser_conn *iser_conn = dto->conn;
|
||||
struct iscsi_conn *conn = iser_conn->iscsi_conn;
|
||||
struct iscsi_mgmt_task *mtask;
|
||||
|
||||
iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
|
||||
|
||||
iser_dto_buffs_release(dto);
|
||||
|
||||
if (tx_desc->type == ISCSI_TX_DATAOUT)
|
||||
kmem_cache_free(ig.desc_cache, tx_desc);
|
||||
|
||||
atomic_dec(&iser_conn->ib_conn->post_send_buf_count);
|
||||
|
||||
write_lock(conn->recv_lock);
|
||||
if (conn->suspend_tx) {
|
||||
iser_dbg("%ld resuming tx\n",jiffies);
|
||||
clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
|
||||
scsi_queue_work(conn->session->host, &conn->xmitwork);
|
||||
}
|
||||
write_unlock(conn->recv_lock);
|
||||
|
||||
if (tx_desc->type == ISCSI_TX_CONTROL) {
|
||||
/* this arithmetic is legal by libiscsi dd_data allocation */
|
||||
mtask = (void *) ((long)(void *)tx_desc -
|
||||
sizeof(struct iscsi_mgmt_task));
|
||||
if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
|
||||
struct iscsi_session *session = conn->session;
|
||||
|
||||
spin_lock(&conn->session->lock);
|
||||
list_del(&mtask->running);
|
||||
__kfifo_put(session->mgmtpool.queue, (void*)&mtask,
|
||||
sizeof(void*));
|
||||
spin_unlock(&session->lock);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *iser_ctask)
|
||||
|
||||
{
|
||||
iser_ctask->status = ISER_TASK_STATUS_INIT;
|
||||
|
||||
iser_ctask->dir[ISER_DIR_IN] = 0;
|
||||
iser_ctask->dir[ISER_DIR_OUT] = 0;
|
||||
|
||||
iser_ctask->data[ISER_DIR_IN].data_len = 0;
|
||||
iser_ctask->data[ISER_DIR_OUT].data_len = 0;
|
||||
|
||||
memset(&iser_ctask->rdma_regd[ISER_DIR_IN], 0,
|
||||
sizeof(struct iser_regd_buf));
|
||||
memset(&iser_ctask->rdma_regd[ISER_DIR_OUT], 0,
|
||||
sizeof(struct iser_regd_buf));
|
||||
}
|
||||
|
||||
void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *iser_ctask)
|
||||
{
|
||||
int deferred;
|
||||
|
||||
/* if we were reading, copy back to unaligned sglist,
|
||||
* anyway dma_unmap and free the copy
|
||||
*/
|
||||
if (iser_ctask->data_copy[ISER_DIR_IN].copy_buf != NULL)
|
||||
iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_IN);
|
||||
if (iser_ctask->data_copy[ISER_DIR_OUT].copy_buf != NULL)
|
||||
iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_OUT);
|
||||
|
||||
if (iser_ctask->dir[ISER_DIR_IN]) {
|
||||
deferred = iser_regd_buff_release
|
||||
(&iser_ctask->rdma_regd[ISER_DIR_IN]);
|
||||
if (deferred) {
|
||||
iser_err("References remain for BUF-IN rdma reg\n");
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
if (iser_ctask->dir[ISER_DIR_OUT]) {
|
||||
deferred = iser_regd_buff_release
|
||||
(&iser_ctask->rdma_regd[ISER_DIR_OUT]);
|
||||
if (deferred) {
|
||||
iser_err("References remain for BUF-OUT rdma reg\n");
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
iser_dma_unmap_task_data(iser_ctask);
|
||||
}
|
||||
|
||||
void iser_dto_buffs_release(struct iser_dto *dto)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < dto->regd_vector_len; i++)
|
||||
iser_regd_buff_release(dto->regd[i]);
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,401 @@
|
|||
/*
|
||||
* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
|
||||
*
|
||||
* This software is available to you under a choice of one of two
|
||||
* licenses. You may choose to be licensed under the terms of the GNU
|
||||
* General Public License (GPL) Version 2, available from the file
|
||||
* COPYING in the main directory of this source tree, or the
|
||||
* OpenIB.org BSD license below:
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or
|
||||
* without modification, are permitted provided that the following
|
||||
* conditions are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer.
|
||||
*
|
||||
* - Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials
|
||||
* provided with the distribution.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*
|
||||
* $Id: iser_memory.c 6964 2006-05-07 11:11:43Z ogerlitz $
|
||||
*/
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/mm.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/scatterlist.h>
|
||||
#include <linux/scatterlist.h>
|
||||
|
||||
#include "iscsi_iser.h"
|
||||
|
||||
#define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */
|
||||
/**
|
||||
* Decrements the reference count for the
|
||||
* registered buffer & releases it
|
||||
*
|
||||
* returns 0 if released, 1 if deferred
|
||||
*/
|
||||
int iser_regd_buff_release(struct iser_regd_buf *regd_buf)
|
||||
{
|
||||
struct device *dma_device;
|
||||
|
||||
if ((atomic_read(®d_buf->ref_count) == 0) ||
|
||||
atomic_dec_and_test(®d_buf->ref_count)) {
|
||||
/* if we used the dma mr, unreg is just NOP */
|
||||
if (regd_buf->reg.rkey != 0)
|
||||
iser_unreg_mem(®d_buf->reg);
|
||||
|
||||
if (regd_buf->dma_addr) {
|
||||
dma_device = regd_buf->device->ib_device->dma_device;
|
||||
dma_unmap_single(dma_device,
|
||||
regd_buf->dma_addr,
|
||||
regd_buf->data_size,
|
||||
regd_buf->direction);
|
||||
}
|
||||
/* else this regd buf is associated with task which we */
|
||||
/* dma_unmap_single/sg later */
|
||||
return 0;
|
||||
} else {
|
||||
iser_dbg("Release deferred, regd.buff: 0x%p\n", regd_buf);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_reg_single - fills registered buffer descriptor with
|
||||
* registration information
|
||||
*/
|
||||
void iser_reg_single(struct iser_device *device,
|
||||
struct iser_regd_buf *regd_buf,
|
||||
enum dma_data_direction direction)
|
||||
{
|
||||
dma_addr_t dma_addr;
|
||||
|
||||
dma_addr = dma_map_single(device->ib_device->dma_device,
|
||||
regd_buf->virt_addr,
|
||||
regd_buf->data_size, direction);
|
||||
BUG_ON(dma_mapping_error(dma_addr));
|
||||
|
||||
regd_buf->reg.lkey = device->mr->lkey;
|
||||
regd_buf->reg.rkey = 0; /* indicate there's no need to unreg */
|
||||
regd_buf->reg.len = regd_buf->data_size;
|
||||
regd_buf->reg.va = dma_addr;
|
||||
|
||||
regd_buf->dma_addr = dma_addr;
|
||||
regd_buf->direction = direction;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_start_rdma_unaligned_sg
|
||||
*/
|
||||
int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
|
||||
enum iser_data_dir cmd_dir)
|
||||
{
|
||||
int dma_nents;
|
||||
struct device *dma_device;
|
||||
char *mem = NULL;
|
||||
struct iser_data_buf *data = &iser_ctask->data[cmd_dir];
|
||||
unsigned long cmd_data_len = data->data_len;
|
||||
|
||||
if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
|
||||
mem = (void *)__get_free_pages(GFP_NOIO,
|
||||
long_log2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
|
||||
else
|
||||
mem = kmalloc(cmd_data_len, GFP_NOIO);
|
||||
|
||||
if (mem == NULL) {
|
||||
iser_err("Failed to allocate mem size %d %d for copying sglist\n",
|
||||
data->size,(int)cmd_data_len);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
if (cmd_dir == ISER_DIR_OUT) {
|
||||
/* copy the unaligned sg the buffer which is used for RDMA */
|
||||
struct scatterlist *sg = (struct scatterlist *)data->buf;
|
||||
int i;
|
||||
char *p, *from;
|
||||
|
||||
for (p = mem, i = 0; i < data->size; i++) {
|
||||
from = kmap_atomic(sg[i].page, KM_USER0);
|
||||
memcpy(p,
|
||||
from + sg[i].offset,
|
||||
sg[i].length);
|
||||
kunmap_atomic(from, KM_USER0);
|
||||
p += sg[i].length;
|
||||
}
|
||||
}
|
||||
|
||||
sg_init_one(&iser_ctask->data_copy[cmd_dir].sg_single, mem, cmd_data_len);
|
||||
iser_ctask->data_copy[cmd_dir].buf =
|
||||
&iser_ctask->data_copy[cmd_dir].sg_single;
|
||||
iser_ctask->data_copy[cmd_dir].size = 1;
|
||||
|
||||
iser_ctask->data_copy[cmd_dir].copy_buf = mem;
|
||||
|
||||
dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
|
||||
|
||||
if (cmd_dir == ISER_DIR_OUT)
|
||||
dma_nents = dma_map_sg(dma_device,
|
||||
&iser_ctask->data_copy[cmd_dir].sg_single,
|
||||
1, DMA_TO_DEVICE);
|
||||
else
|
||||
dma_nents = dma_map_sg(dma_device,
|
||||
&iser_ctask->data_copy[cmd_dir].sg_single,
|
||||
1, DMA_FROM_DEVICE);
|
||||
|
||||
BUG_ON(dma_nents == 0);
|
||||
|
||||
iser_ctask->data_copy[cmd_dir].dma_nents = dma_nents;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_finalize_rdma_unaligned_sg
|
||||
*/
|
||||
void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
|
||||
enum iser_data_dir cmd_dir)
|
||||
{
|
||||
struct device *dma_device;
|
||||
struct iser_data_buf *mem_copy;
|
||||
unsigned long cmd_data_len;
|
||||
|
||||
dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
|
||||
mem_copy = &iser_ctask->data_copy[cmd_dir];
|
||||
|
||||
if (cmd_dir == ISER_DIR_OUT)
|
||||
dma_unmap_sg(dma_device, &mem_copy->sg_single, 1,
|
||||
DMA_TO_DEVICE);
|
||||
else
|
||||
dma_unmap_sg(dma_device, &mem_copy->sg_single, 1,
|
||||
DMA_FROM_DEVICE);
|
||||
|
||||
if (cmd_dir == ISER_DIR_IN) {
|
||||
char *mem;
|
||||
struct scatterlist *sg;
|
||||
unsigned char *p, *to;
|
||||
unsigned int sg_size;
|
||||
int i;
|
||||
|
||||
/* copy back read RDMA to unaligned sg */
|
||||
mem = mem_copy->copy_buf;
|
||||
|
||||
sg = (struct scatterlist *)iser_ctask->data[ISER_DIR_IN].buf;
|
||||
sg_size = iser_ctask->data[ISER_DIR_IN].size;
|
||||
|
||||
for (p = mem, i = 0; i < sg_size; i++){
|
||||
to = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
|
||||
memcpy(to + sg[i].offset,
|
||||
p,
|
||||
sg[i].length);
|
||||
kunmap_atomic(to, KM_SOFTIRQ0);
|
||||
p += sg[i].length;
|
||||
}
|
||||
}
|
||||
|
||||
cmd_data_len = iser_ctask->data[cmd_dir].data_len;
|
||||
|
||||
if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
|
||||
free_pages((unsigned long)mem_copy->copy_buf,
|
||||
long_log2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
|
||||
else
|
||||
kfree(mem_copy->copy_buf);
|
||||
|
||||
mem_copy->copy_buf = NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_sg_to_page_vec - Translates scatterlist entries to physical addresses
|
||||
* and returns the length of resulting physical address array (may be less than
|
||||
* the original due to possible compaction).
|
||||
*
|
||||
* we build a "page vec" under the assumption that the SG meets the RDMA
|
||||
* alignment requirements. Other then the first and last SG elements, all
|
||||
* the "internal" elements can be compacted into a list whose elements are
|
||||
* dma addresses of physical pages. The code supports also the weird case
|
||||
* where --few fragments of the same page-- are present in the SG as
|
||||
* consecutive elements. Also, it handles one entry SG.
|
||||
*/
|
||||
static int iser_sg_to_page_vec(struct iser_data_buf *data,
|
||||
struct iser_page_vec *page_vec)
|
||||
{
|
||||
struct scatterlist *sg = (struct scatterlist *)data->buf;
|
||||
dma_addr_t first_addr, last_addr, page;
|
||||
int start_aligned, end_aligned;
|
||||
unsigned int cur_page = 0;
|
||||
unsigned long total_sz = 0;
|
||||
int i;
|
||||
|
||||
/* compute the offset of first element */
|
||||
page_vec->offset = (u64) sg[0].offset;
|
||||
|
||||
for (i = 0; i < data->dma_nents; i++) {
|
||||
total_sz += sg_dma_len(&sg[i]);
|
||||
|
||||
first_addr = sg_dma_address(&sg[i]);
|
||||
last_addr = first_addr + sg_dma_len(&sg[i]);
|
||||
|
||||
start_aligned = !(first_addr & ~PAGE_MASK);
|
||||
end_aligned = !(last_addr & ~PAGE_MASK);
|
||||
|
||||
/* continue to collect page fragments till aligned or SG ends */
|
||||
while (!end_aligned && (i + 1 < data->dma_nents)) {
|
||||
i++;
|
||||
total_sz += sg_dma_len(&sg[i]);
|
||||
last_addr = sg_dma_address(&sg[i]) + sg_dma_len(&sg[i]);
|
||||
end_aligned = !(last_addr & ~PAGE_MASK);
|
||||
}
|
||||
|
||||
first_addr = first_addr & PAGE_MASK;
|
||||
|
||||
for (page = first_addr; page < last_addr; page += PAGE_SIZE)
|
||||
page_vec->pages[cur_page++] = page;
|
||||
|
||||
}
|
||||
page_vec->data_size = total_sz;
|
||||
iser_dbg("page_vec->data_size:%d cur_page %d\n", page_vec->data_size,cur_page);
|
||||
return cur_page;
|
||||
}
|
||||
|
||||
#define MASK_4K ((1UL << 12) - 1) /* 0xFFF */
|
||||
#define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & MASK_4K) == 0)
|
||||
|
||||
/**
|
||||
* iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned
|
||||
* for RDMA sub-list of a scatter-gather list of memory buffers, and returns
|
||||
* the number of entries which are aligned correctly. Supports the case where
|
||||
* consecutive SG elements are actually fragments of the same physcial page.
|
||||
*/
|
||||
static unsigned int iser_data_buf_aligned_len(struct iser_data_buf *data)
|
||||
{
|
||||
struct scatterlist *sg;
|
||||
dma_addr_t end_addr, next_addr;
|
||||
int i, cnt;
|
||||
unsigned int ret_len = 0;
|
||||
|
||||
sg = (struct scatterlist *)data->buf;
|
||||
|
||||
for (cnt = 0, i = 0; i < data->dma_nents; i++, cnt++) {
|
||||
/* iser_dbg("Checking sg iobuf [%d]: phys=0x%08lX "
|
||||
"offset: %ld sz: %ld\n", i,
|
||||
(unsigned long)page_to_phys(sg[i].page),
|
||||
(unsigned long)sg[i].offset,
|
||||
(unsigned long)sg[i].length); */
|
||||
end_addr = sg_dma_address(&sg[i]) +
|
||||
sg_dma_len(&sg[i]);
|
||||
/* iser_dbg("Checking sg iobuf end address "
|
||||
"0x%08lX\n", end_addr); */
|
||||
if (i + 1 < data->dma_nents) {
|
||||
next_addr = sg_dma_address(&sg[i+1]);
|
||||
/* are i, i+1 fragments of the same page? */
|
||||
if (end_addr == next_addr)
|
||||
continue;
|
||||
else if (!IS_4K_ALIGNED(end_addr)) {
|
||||
ret_len = cnt + 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (i == data->dma_nents)
|
||||
ret_len = cnt; /* loop ended */
|
||||
iser_dbg("Found %d aligned entries out of %d in sg:0x%p\n",
|
||||
ret_len, data->dma_nents, data);
|
||||
return ret_len;
|
||||
}
|
||||
|
||||
static void iser_data_buf_dump(struct iser_data_buf *data)
|
||||
{
|
||||
struct scatterlist *sg = (struct scatterlist *)data->buf;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < data->size; i++)
|
||||
iser_err("sg[%d] dma_addr:0x%lX page:0x%p "
|
||||
"off:%d sz:%d dma_len:%d\n",
|
||||
i, (unsigned long)sg_dma_address(&sg[i]),
|
||||
sg[i].page, sg[i].offset,
|
||||
sg[i].length,sg_dma_len(&sg[i]));
|
||||
}
|
||||
|
||||
static void iser_dump_page_vec(struct iser_page_vec *page_vec)
|
||||
{
|
||||
int i;
|
||||
|
||||
iser_err("page vec length %d data size %d\n",
|
||||
page_vec->length, page_vec->data_size);
|
||||
for (i = 0; i < page_vec->length; i++)
|
||||
iser_err("%d %lx\n",i,(unsigned long)page_vec->pages[i]);
|
||||
}
|
||||
|
||||
static void iser_page_vec_build(struct iser_data_buf *data,
|
||||
struct iser_page_vec *page_vec)
|
||||
{
|
||||
int page_vec_len = 0;
|
||||
|
||||
page_vec->length = 0;
|
||||
page_vec->offset = 0;
|
||||
|
||||
iser_dbg("Translating sg sz: %d\n", data->dma_nents);
|
||||
page_vec_len = iser_sg_to_page_vec(data,page_vec);
|
||||
iser_dbg("sg len %d page_vec_len %d\n", data->dma_nents,page_vec_len);
|
||||
|
||||
page_vec->length = page_vec_len;
|
||||
|
||||
if (page_vec_len * PAGE_SIZE < page_vec->data_size) {
|
||||
iser_err("page_vec too short to hold this SG\n");
|
||||
iser_data_buf_dump(data);
|
||||
iser_dump_page_vec(page_vec);
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_reg_rdma_mem - Registers memory intended for RDMA,
|
||||
* obtaining rkey and va
|
||||
*
|
||||
* returns 0 on success, errno code on failure
|
||||
*/
|
||||
int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *iser_ctask,
|
||||
enum iser_data_dir cmd_dir)
|
||||
{
|
||||
struct iser_conn *ib_conn = iser_ctask->iser_conn->ib_conn;
|
||||
struct iser_data_buf *mem = &iser_ctask->data[cmd_dir];
|
||||
struct iser_regd_buf *regd_buf;
|
||||
int aligned_len;
|
||||
int err;
|
||||
|
||||
regd_buf = &iser_ctask->rdma_regd[cmd_dir];
|
||||
|
||||
aligned_len = iser_data_buf_aligned_len(mem);
|
||||
if (aligned_len != mem->size) {
|
||||
iser_err("rdma alignment violation %d/%d aligned\n",
|
||||
aligned_len, mem->size);
|
||||
iser_data_buf_dump(mem);
|
||||
/* allocate copy buf, if we are writing, copy the */
|
||||
/* unaligned scatterlist, dma map the copy */
|
||||
if (iser_start_rdma_unaligned_sg(iser_ctask, cmd_dir) != 0)
|
||||
return -ENOMEM;
|
||||
mem = &iser_ctask->data_copy[cmd_dir];
|
||||
}
|
||||
|
||||
iser_page_vec_build(mem, ib_conn->page_vec);
|
||||
err = iser_reg_page_vec(ib_conn, ib_conn->page_vec, ®d_buf->reg);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* take a reference on this regd buf such that it will not be released *
|
||||
* (eg in send dto completion) before we get the scsi response */
|
||||
atomic_inc(®d_buf->ref_count);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,827 @@
|
|||
/*
|
||||
* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
|
||||
* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
|
||||
*
|
||||
* This software is available to you under a choice of one of two
|
||||
* licenses. You may choose to be licensed under the terms of the GNU
|
||||
* General Public License (GPL) Version 2, available from the file
|
||||
* COPYING in the main directory of this source tree, or the
|
||||
* OpenIB.org BSD license below:
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or
|
||||
* without modification, are permitted provided that the following
|
||||
* conditions are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer.
|
||||
*
|
||||
* - Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials
|
||||
* provided with the distribution.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*
|
||||
* $Id: iser_verbs.c 7051 2006-05-10 12:29:11Z ogerlitz $
|
||||
*/
|
||||
#include <asm/io.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/smp_lock.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/version.h>
|
||||
|
||||
#include "iscsi_iser.h"
|
||||
|
||||
#define ISCSI_ISER_MAX_CONN 8
|
||||
#define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \
|
||||
ISER_QP_MAX_REQ_DTOS) * \
|
||||
ISCSI_ISER_MAX_CONN)
|
||||
|
||||
static void iser_cq_tasklet_fn(unsigned long data);
|
||||
static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
|
||||
static void iser_comp_error_worker(void *data);
|
||||
|
||||
static void iser_cq_event_callback(struct ib_event *cause, void *context)
|
||||
{
|
||||
iser_err("got cq event %d \n", cause->event);
|
||||
}
|
||||
|
||||
static void iser_qp_event_callback(struct ib_event *cause, void *context)
|
||||
{
|
||||
iser_err("got qp event %d\n",cause->event);
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_create_device_ib_res - creates Protection Domain (PD), Completion
|
||||
* Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
|
||||
* the adapator.
|
||||
*
|
||||
* returns 0 on success, -1 on failure
|
||||
*/
|
||||
static int iser_create_device_ib_res(struct iser_device *device)
|
||||
{
|
||||
device->pd = ib_alloc_pd(device->ib_device);
|
||||
if (IS_ERR(device->pd))
|
||||
goto pd_err;
|
||||
|
||||
device->cq = ib_create_cq(device->ib_device,
|
||||
iser_cq_callback,
|
||||
iser_cq_event_callback,
|
||||
(void *)device,
|
||||
ISER_MAX_CQ_LEN);
|
||||
if (IS_ERR(device->cq))
|
||||
goto cq_err;
|
||||
|
||||
if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP))
|
||||
goto cq_arm_err;
|
||||
|
||||
tasklet_init(&device->cq_tasklet,
|
||||
iser_cq_tasklet_fn,
|
||||
(unsigned long)device);
|
||||
|
||||
device->mr = ib_get_dma_mr(device->pd,
|
||||
IB_ACCESS_LOCAL_WRITE);
|
||||
if (IS_ERR(device->mr))
|
||||
goto dma_mr_err;
|
||||
|
||||
return 0;
|
||||
|
||||
dma_mr_err:
|
||||
tasklet_kill(&device->cq_tasklet);
|
||||
cq_arm_err:
|
||||
ib_destroy_cq(device->cq);
|
||||
cq_err:
|
||||
ib_dealloc_pd(device->pd);
|
||||
pd_err:
|
||||
iser_err("failed to allocate an IB resource\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_free_device_ib_res - destory/dealloc/dereg the DMA MR,
|
||||
* CQ and PD created with the device associated with the adapator.
|
||||
*/
|
||||
static void iser_free_device_ib_res(struct iser_device *device)
|
||||
{
|
||||
BUG_ON(device->mr == NULL);
|
||||
|
||||
tasklet_kill(&device->cq_tasklet);
|
||||
|
||||
(void)ib_dereg_mr(device->mr);
|
||||
(void)ib_destroy_cq(device->cq);
|
||||
(void)ib_dealloc_pd(device->pd);
|
||||
|
||||
device->mr = NULL;
|
||||
device->cq = NULL;
|
||||
device->pd = NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP)
|
||||
*
|
||||
* returns 0 on success, -1 on failure
|
||||
*/
|
||||
static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
|
||||
{
|
||||
struct iser_device *device;
|
||||
struct ib_qp_init_attr init_attr;
|
||||
int ret;
|
||||
struct ib_fmr_pool_param params;
|
||||
|
||||
BUG_ON(ib_conn->device == NULL);
|
||||
|
||||
device = ib_conn->device;
|
||||
|
||||
ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
|
||||
(sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
|
||||
GFP_KERNEL);
|
||||
if (!ib_conn->page_vec) {
|
||||
ret = -ENOMEM;
|
||||
goto alloc_err;
|
||||
}
|
||||
ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
|
||||
|
||||
params.page_shift = PAGE_SHIFT;
|
||||
/* when the first/last SG element are not start/end *
|
||||
* page aligned, the map whould be of N+1 pages */
|
||||
params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
|
||||
/* make the pool size twice the max number of SCSI commands *
|
||||
* the ML is expected to queue, watermark for unmap at 50% */
|
||||
params.pool_size = ISCSI_XMIT_CMDS_MAX * 2;
|
||||
params.dirty_watermark = ISCSI_XMIT_CMDS_MAX;
|
||||
params.cache = 0;
|
||||
params.flush_function = NULL;
|
||||
params.access = (IB_ACCESS_LOCAL_WRITE |
|
||||
IB_ACCESS_REMOTE_WRITE |
|
||||
IB_ACCESS_REMOTE_READ);
|
||||
|
||||
ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms);
|
||||
if (IS_ERR(ib_conn->fmr_pool)) {
|
||||
ret = PTR_ERR(ib_conn->fmr_pool);
|
||||
goto fmr_pool_err;
|
||||
}
|
||||
|
||||
memset(&init_attr, 0, sizeof init_attr);
|
||||
|
||||
init_attr.event_handler = iser_qp_event_callback;
|
||||
init_attr.qp_context = (void *)ib_conn;
|
||||
init_attr.send_cq = device->cq;
|
||||
init_attr.recv_cq = device->cq;
|
||||
init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
|
||||
init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
|
||||
init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN;
|
||||
init_attr.cap.max_recv_sge = 2;
|
||||
init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
|
||||
init_attr.qp_type = IB_QPT_RC;
|
||||
|
||||
ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
|
||||
if (ret)
|
||||
goto qp_err;
|
||||
|
||||
ib_conn->qp = ib_conn->cma_id->qp;
|
||||
iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
|
||||
ib_conn, ib_conn->cma_id,
|
||||
ib_conn->fmr_pool, ib_conn->cma_id->qp);
|
||||
return ret;
|
||||
|
||||
qp_err:
|
||||
(void)ib_destroy_fmr_pool(ib_conn->fmr_pool);
|
||||
fmr_pool_err:
|
||||
kfree(ib_conn->page_vec);
|
||||
alloc_err:
|
||||
iser_err("unable to alloc mem or create resource, err %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* releases the FMR pool, QP and CMA ID objects, returns 0 on success,
|
||||
* -1 on failure
|
||||
*/
|
||||
static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
|
||||
{
|
||||
BUG_ON(ib_conn == NULL);
|
||||
|
||||
iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n",
|
||||
ib_conn, ib_conn->cma_id,
|
||||
ib_conn->fmr_pool, ib_conn->qp);
|
||||
|
||||
/* qp is created only once both addr & route are resolved */
|
||||
if (ib_conn->fmr_pool != NULL)
|
||||
ib_destroy_fmr_pool(ib_conn->fmr_pool);
|
||||
|
||||
if (ib_conn->qp != NULL)
|
||||
rdma_destroy_qp(ib_conn->cma_id);
|
||||
|
||||
if (ib_conn->cma_id != NULL)
|
||||
rdma_destroy_id(ib_conn->cma_id);
|
||||
|
||||
ib_conn->fmr_pool = NULL;
|
||||
ib_conn->qp = NULL;
|
||||
ib_conn->cma_id = NULL;
|
||||
kfree(ib_conn->page_vec);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* based on the resolved device node GUID see if there already allocated
|
||||
* device for this device. If there's no such, create one.
|
||||
*/
|
||||
static
|
||||
struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
|
||||
{
|
||||
struct list_head *p_list;
|
||||
struct iser_device *device = NULL;
|
||||
|
||||
mutex_lock(&ig.device_list_mutex);
|
||||
|
||||
p_list = ig.device_list.next;
|
||||
while (p_list != &ig.device_list) {
|
||||
device = list_entry(p_list, struct iser_device, ig_list);
|
||||
/* find if there's a match using the node GUID */
|
||||
if (device->ib_device->node_guid == cma_id->device->node_guid)
|
||||
break;
|
||||
}
|
||||
|
||||
if (device == NULL) {
|
||||
device = kzalloc(sizeof *device, GFP_KERNEL);
|
||||
if (device == NULL)
|
||||
goto out;
|
||||
/* assign this device to the device */
|
||||
device->ib_device = cma_id->device;
|
||||
/* init the device and link it into ig device list */
|
||||
if (iser_create_device_ib_res(device)) {
|
||||
kfree(device);
|
||||
device = NULL;
|
||||
goto out;
|
||||
}
|
||||
list_add(&device->ig_list, &ig.device_list);
|
||||
}
|
||||
out:
|
||||
BUG_ON(device == NULL);
|
||||
device->refcount++;
|
||||
mutex_unlock(&ig.device_list_mutex);
|
||||
return device;
|
||||
}
|
||||
|
||||
/* if there's no demand for this device, release it */
|
||||
static void iser_device_try_release(struct iser_device *device)
|
||||
{
|
||||
mutex_lock(&ig.device_list_mutex);
|
||||
device->refcount--;
|
||||
iser_err("device %p refcount %d\n",device,device->refcount);
|
||||
if (!device->refcount) {
|
||||
iser_free_device_ib_res(device);
|
||||
list_del(&device->ig_list);
|
||||
kfree(device);
|
||||
}
|
||||
mutex_unlock(&ig.device_list_mutex);
|
||||
}
|
||||
|
||||
int iser_conn_state_comp(struct iser_conn *ib_conn,
|
||||
enum iser_ib_conn_state comp)
|
||||
{
|
||||
int ret;
|
||||
|
||||
spin_lock_bh(&ib_conn->lock);
|
||||
ret = (ib_conn->state == comp);
|
||||
spin_unlock_bh(&ib_conn->lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
|
||||
enum iser_ib_conn_state comp,
|
||||
enum iser_ib_conn_state exch)
|
||||
{
|
||||
int ret;
|
||||
|
||||
spin_lock_bh(&ib_conn->lock);
|
||||
if ((ret = (ib_conn->state == comp)))
|
||||
ib_conn->state = exch;
|
||||
spin_unlock_bh(&ib_conn->lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* triggers start of the disconnect procedures and wait for them to be done
|
||||
*/
|
||||
void iser_conn_terminate(struct iser_conn *ib_conn)
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
/* change the ib conn state only if the conn is UP, however always call
|
||||
* rdma_disconnect since this is the only way to cause the CMA to change
|
||||
* the QP state to ERROR
|
||||
*/
|
||||
|
||||
iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING);
|
||||
err = rdma_disconnect(ib_conn->cma_id);
|
||||
if (err)
|
||||
iser_err("Failed to disconnect, conn: 0x%p err %d\n",
|
||||
ib_conn,err);
|
||||
|
||||
wait_event_interruptible(ib_conn->wait,
|
||||
ib_conn->state == ISER_CONN_DOWN);
|
||||
|
||||
iser_conn_release(ib_conn);
|
||||
}
|
||||
|
||||
static void iser_connect_error(struct rdma_cm_id *cma_id)
|
||||
{
|
||||
struct iser_conn *ib_conn;
|
||||
ib_conn = (struct iser_conn *)cma_id->context;
|
||||
|
||||
ib_conn->state = ISER_CONN_DOWN;
|
||||
wake_up_interruptible(&ib_conn->wait);
|
||||
}
|
||||
|
||||
static void iser_addr_handler(struct rdma_cm_id *cma_id)
|
||||
{
|
||||
struct iser_device *device;
|
||||
struct iser_conn *ib_conn;
|
||||
int ret;
|
||||
|
||||
device = iser_device_find_by_ib_device(cma_id);
|
||||
ib_conn = (struct iser_conn *)cma_id->context;
|
||||
ib_conn->device = device;
|
||||
|
||||
ret = rdma_resolve_route(cma_id, 1000);
|
||||
if (ret) {
|
||||
iser_err("resolve route failed: %d\n", ret);
|
||||
iser_connect_error(cma_id);
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
static void iser_route_handler(struct rdma_cm_id *cma_id)
|
||||
{
|
||||
struct rdma_conn_param conn_param;
|
||||
int ret;
|
||||
|
||||
ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context);
|
||||
if (ret)
|
||||
goto failure;
|
||||
|
||||
iser_dbg("path.mtu is %d setting it to %d\n",
|
||||
cma_id->route.path_rec->mtu, IB_MTU_1024);
|
||||
|
||||
/* we must set the MTU to 1024 as this is what the target is assuming */
|
||||
if (cma_id->route.path_rec->mtu > IB_MTU_1024)
|
||||
cma_id->route.path_rec->mtu = IB_MTU_1024;
|
||||
|
||||
memset(&conn_param, 0, sizeof conn_param);
|
||||
conn_param.responder_resources = 4;
|
||||
conn_param.initiator_depth = 1;
|
||||
conn_param.retry_count = 7;
|
||||
conn_param.rnr_retry_count = 6;
|
||||
|
||||
ret = rdma_connect(cma_id, &conn_param);
|
||||
if (ret) {
|
||||
iser_err("failure connecting: %d\n", ret);
|
||||
goto failure;
|
||||
}
|
||||
|
||||
return;
|
||||
failure:
|
||||
iser_connect_error(cma_id);
|
||||
}
|
||||
|
||||
static void iser_connected_handler(struct rdma_cm_id *cma_id)
|
||||
{
|
||||
struct iser_conn *ib_conn;
|
||||
|
||||
ib_conn = (struct iser_conn *)cma_id->context;
|
||||
ib_conn->state = ISER_CONN_UP;
|
||||
wake_up_interruptible(&ib_conn->wait);
|
||||
}
|
||||
|
||||
static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
|
||||
{
|
||||
struct iser_conn *ib_conn;
|
||||
|
||||
ib_conn = (struct iser_conn *)cma_id->context;
|
||||
ib_conn->disc_evt_flag = 1;
|
||||
|
||||
/* getting here when the state is UP means that the conn is being *
|
||||
* terminated asynchronously from the iSCSI layer's perspective. */
|
||||
if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
|
||||
ISER_CONN_TERMINATING))
|
||||
iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
|
||||
ISCSI_ERR_CONN_FAILED);
|
||||
|
||||
/* Complete the termination process if no posts are pending */
|
||||
if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) &&
|
||||
(atomic_read(&ib_conn->post_send_buf_count) == 0)) {
|
||||
ib_conn->state = ISER_CONN_DOWN;
|
||||
wake_up_interruptible(&ib_conn->wait);
|
||||
}
|
||||
}
|
||||
|
||||
static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id);
|
||||
|
||||
switch (event->event) {
|
||||
case RDMA_CM_EVENT_ADDR_RESOLVED:
|
||||
iser_addr_handler(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_ROUTE_RESOLVED:
|
||||
iser_route_handler(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_ESTABLISHED:
|
||||
iser_connected_handler(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_ADDR_ERROR:
|
||||
case RDMA_CM_EVENT_ROUTE_ERROR:
|
||||
case RDMA_CM_EVENT_CONNECT_ERROR:
|
||||
case RDMA_CM_EVENT_UNREACHABLE:
|
||||
case RDMA_CM_EVENT_REJECTED:
|
||||
iser_err("event: %d, error: %d\n", event->event, event->status);
|
||||
iser_connect_error(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_DISCONNECTED:
|
||||
iser_disconnected_handler(cma_id);
|
||||
break;
|
||||
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
||||
BUG();
|
||||
break;
|
||||
case RDMA_CM_EVENT_CONNECT_RESPONSE:
|
||||
BUG();
|
||||
break;
|
||||
case RDMA_CM_EVENT_CONNECT_REQUEST:
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int iser_conn_init(struct iser_conn **ibconn)
|
||||
{
|
||||
struct iser_conn *ib_conn;
|
||||
|
||||
ib_conn = kzalloc(sizeof *ib_conn, GFP_KERNEL);
|
||||
if (!ib_conn) {
|
||||
iser_err("can't alloc memory for struct iser_conn\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
ib_conn->state = ISER_CONN_INIT;
|
||||
init_waitqueue_head(&ib_conn->wait);
|
||||
atomic_set(&ib_conn->post_recv_buf_count, 0);
|
||||
atomic_set(&ib_conn->post_send_buf_count, 0);
|
||||
INIT_WORK(&ib_conn->comperror_work, iser_comp_error_worker,
|
||||
ib_conn);
|
||||
INIT_LIST_HEAD(&ib_conn->conn_list);
|
||||
spin_lock_init(&ib_conn->lock);
|
||||
|
||||
*ibconn = ib_conn;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* starts the process of connecting to the target
|
||||
* sleeps untill the connection is established or rejected
|
||||
*/
|
||||
int iser_connect(struct iser_conn *ib_conn,
|
||||
struct sockaddr_in *src_addr,
|
||||
struct sockaddr_in *dst_addr,
|
||||
int non_blocking)
|
||||
{
|
||||
struct sockaddr *src, *dst;
|
||||
int err = 0;
|
||||
|
||||
sprintf(ib_conn->name,"%d.%d.%d.%d:%d",
|
||||
NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port);
|
||||
|
||||
/* the device is known only --after-- address resolution */
|
||||
ib_conn->device = NULL;
|
||||
|
||||
iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n",
|
||||
NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port);
|
||||
|
||||
ib_conn->state = ISER_CONN_PENDING;
|
||||
|
||||
ib_conn->cma_id = rdma_create_id(iser_cma_handler,
|
||||
(void *)ib_conn,
|
||||
RDMA_PS_TCP);
|
||||
if (IS_ERR(ib_conn->cma_id)) {
|
||||
err = PTR_ERR(ib_conn->cma_id);
|
||||
iser_err("rdma_create_id failed: %d\n", err);
|
||||
goto id_failure;
|
||||
}
|
||||
|
||||
src = (struct sockaddr *)src_addr;
|
||||
dst = (struct sockaddr *)dst_addr;
|
||||
err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);
|
||||
if (err) {
|
||||
iser_err("rdma_resolve_addr failed: %d\n", err);
|
||||
goto addr_failure;
|
||||
}
|
||||
|
||||
if (!non_blocking) {
|
||||
wait_event_interruptible(ib_conn->wait,
|
||||
(ib_conn->state != ISER_CONN_PENDING));
|
||||
|
||||
if (ib_conn->state != ISER_CONN_UP) {
|
||||
err = -EIO;
|
||||
goto connect_failure;
|
||||
}
|
||||
}
|
||||
|
||||
mutex_lock(&ig.connlist_mutex);
|
||||
list_add(&ib_conn->conn_list, &ig.connlist);
|
||||
mutex_unlock(&ig.connlist_mutex);
|
||||
return 0;
|
||||
|
||||
id_failure:
|
||||
ib_conn->cma_id = NULL;
|
||||
addr_failure:
|
||||
ib_conn->state = ISER_CONN_DOWN;
|
||||
connect_failure:
|
||||
iser_conn_release(ib_conn);
|
||||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* Frees all conn objects and deallocs conn descriptor
|
||||
*/
|
||||
void iser_conn_release(struct iser_conn *ib_conn)
|
||||
{
|
||||
struct iser_device *device = ib_conn->device;
|
||||
|
||||
BUG_ON(ib_conn->state != ISER_CONN_DOWN);
|
||||
|
||||
mutex_lock(&ig.connlist_mutex);
|
||||
list_del(&ib_conn->conn_list);
|
||||
mutex_unlock(&ig.connlist_mutex);
|
||||
|
||||
iser_free_ib_conn_res(ib_conn);
|
||||
ib_conn->device = NULL;
|
||||
/* on EVENT_ADDR_ERROR there's no device yet for this conn */
|
||||
if (device != NULL)
|
||||
iser_device_try_release(device);
|
||||
kfree(ib_conn);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* iser_reg_page_vec - Register physical memory
|
||||
*
|
||||
* returns: 0 on success, errno code on failure
|
||||
*/
|
||||
int iser_reg_page_vec(struct iser_conn *ib_conn,
|
||||
struct iser_page_vec *page_vec,
|
||||
struct iser_mem_reg *mem_reg)
|
||||
{
|
||||
struct ib_pool_fmr *mem;
|
||||
u64 io_addr;
|
||||
u64 *page_list;
|
||||
int status;
|
||||
|
||||
page_list = page_vec->pages;
|
||||
io_addr = page_list[0];
|
||||
|
||||
mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
|
||||
page_list,
|
||||
page_vec->length,
|
||||
&io_addr);
|
||||
|
||||
if (IS_ERR(mem)) {
|
||||
status = (int)PTR_ERR(mem);
|
||||
iser_err("ib_fmr_pool_map_phys failed: %d\n", status);
|
||||
return status;
|
||||
}
|
||||
|
||||
mem_reg->lkey = mem->fmr->lkey;
|
||||
mem_reg->rkey = mem->fmr->rkey;
|
||||
mem_reg->len = page_vec->length * PAGE_SIZE;
|
||||
mem_reg->va = io_addr;
|
||||
mem_reg->mem_h = (void *)mem;
|
||||
|
||||
mem_reg->va += page_vec->offset;
|
||||
mem_reg->len = page_vec->data_size;
|
||||
|
||||
iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, "
|
||||
"entry[0]: (0x%08lx,%ld)] -> "
|
||||
"[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n",
|
||||
page_vec, page_vec->length,
|
||||
(unsigned long)page_vec->pages[0],
|
||||
(unsigned long)page_vec->data_size,
|
||||
(unsigned int)mem_reg->lkey, mem_reg->mem_h,
|
||||
(unsigned long)mem_reg->va, (unsigned long)mem_reg->len);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Unregister (previosuly registered) memory.
|
||||
*/
|
||||
void iser_unreg_mem(struct iser_mem_reg *reg)
|
||||
{
|
||||
int ret;
|
||||
|
||||
iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
|
||||
|
||||
ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
|
||||
if (ret)
|
||||
iser_err("ib_fmr_pool_unmap failed %d\n", ret);
|
||||
|
||||
reg->mem_h = NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_dto_to_iov - builds IOV from a dto descriptor
|
||||
*/
|
||||
static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len)
|
||||
{
|
||||
int i;
|
||||
struct ib_sge *sge;
|
||||
struct iser_regd_buf *regd_buf;
|
||||
|
||||
if (dto->regd_vector_len > iov_len) {
|
||||
iser_err("iov size %d too small for posting dto of len %d\n",
|
||||
iov_len, dto->regd_vector_len);
|
||||
BUG();
|
||||
}
|
||||
|
||||
for (i = 0; i < dto->regd_vector_len; i++) {
|
||||
sge = &iov[i];
|
||||
regd_buf = dto->regd[i];
|
||||
|
||||
sge->addr = regd_buf->reg.va;
|
||||
sge->length = regd_buf->reg.len;
|
||||
sge->lkey = regd_buf->reg.lkey;
|
||||
|
||||
if (dto->used_sz[i] > 0) /* Adjust size */
|
||||
sge->length = dto->used_sz[i];
|
||||
|
||||
/* offset and length should not exceed the regd buf length */
|
||||
if (sge->length + dto->offset[i] > regd_buf->reg.len) {
|
||||
iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:"
|
||||
"%ld in dto:0x%p [%d], va:0x%08lX\n",
|
||||
(unsigned long)sge->length, dto->offset[i],
|
||||
(unsigned long)regd_buf->reg.len, dto, i,
|
||||
(unsigned long)sge->addr);
|
||||
BUG();
|
||||
}
|
||||
|
||||
sge->addr += dto->offset[i]; /* Adjust offset */
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_post_recv - Posts a receive buffer.
|
||||
*
|
||||
* returns 0 on success, -1 on failure
|
||||
*/
|
||||
int iser_post_recv(struct iser_desc *rx_desc)
|
||||
{
|
||||
int ib_ret, ret_val = 0;
|
||||
struct ib_recv_wr recv_wr, *recv_wr_failed;
|
||||
struct ib_sge iov[2];
|
||||
struct iser_conn *ib_conn;
|
||||
struct iser_dto *recv_dto = &rx_desc->dto;
|
||||
|
||||
/* Retrieve conn */
|
||||
ib_conn = recv_dto->conn->ib_conn;
|
||||
|
||||
iser_dto_to_iov(recv_dto, iov, 2);
|
||||
|
||||
recv_wr.next = NULL;
|
||||
recv_wr.sg_list = iov;
|
||||
recv_wr.num_sge = recv_dto->regd_vector_len;
|
||||
recv_wr.wr_id = (unsigned long)rx_desc;
|
||||
|
||||
atomic_inc(&ib_conn->post_recv_buf_count);
|
||||
ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed);
|
||||
if (ib_ret) {
|
||||
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
|
||||
atomic_dec(&ib_conn->post_recv_buf_count);
|
||||
ret_val = -1;
|
||||
}
|
||||
|
||||
return ret_val;
|
||||
}
|
||||
|
||||
/**
|
||||
* iser_start_send - Initiate a Send DTO operation
|
||||
*
|
||||
* returns 0 on success, -1 on failure
|
||||
*/
|
||||
int iser_post_send(struct iser_desc *tx_desc)
|
||||
{
|
||||
int ib_ret, ret_val = 0;
|
||||
struct ib_send_wr send_wr, *send_wr_failed;
|
||||
struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN];
|
||||
struct iser_conn *ib_conn;
|
||||
struct iser_dto *dto = &tx_desc->dto;
|
||||
|
||||
ib_conn = dto->conn->ib_conn;
|
||||
|
||||
iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN);
|
||||
|
||||
send_wr.next = NULL;
|
||||
send_wr.wr_id = (unsigned long)tx_desc;
|
||||
send_wr.sg_list = iov;
|
||||
send_wr.num_sge = dto->regd_vector_len;
|
||||
send_wr.opcode = IB_WR_SEND;
|
||||
send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0;
|
||||
|
||||
atomic_inc(&ib_conn->post_send_buf_count);
|
||||
|
||||
ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
|
||||
if (ib_ret) {
|
||||
iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n",
|
||||
dto, dto->regd_vector_len);
|
||||
iser_err("ib_post_send failed, ret:%d\n", ib_ret);
|
||||
atomic_dec(&ib_conn->post_send_buf_count);
|
||||
ret_val = -1;
|
||||
}
|
||||
|
||||
return ret_val;
|
||||
}
|
||||
|
||||
static void iser_comp_error_worker(void *data)
|
||||
{
|
||||
struct iser_conn *ib_conn = data;
|
||||
|
||||
/* getting here when the state is UP means that the conn is being *
|
||||
* terminated asynchronously from the iSCSI layer's perspective. */
|
||||
if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
|
||||
ISER_CONN_TERMINATING))
|
||||
iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
|
||||
ISCSI_ERR_CONN_FAILED);
|
||||
|
||||
/* complete the termination process if disconnect event was delivered *
|
||||
* note there are no more non completed posts to the QP */
|
||||
if (ib_conn->disc_evt_flag) {
|
||||
ib_conn->state = ISER_CONN_DOWN;
|
||||
wake_up_interruptible(&ib_conn->wait);
|
||||
}
|
||||
}
|
||||
|
||||
static void iser_handle_comp_error(struct iser_desc *desc)
|
||||
{
|
||||
struct iser_dto *dto = &desc->dto;
|
||||
struct iser_conn *ib_conn = dto->conn->ib_conn;
|
||||
|
||||
iser_dto_buffs_release(dto);
|
||||
|
||||
if (desc->type == ISCSI_RX) {
|
||||
kfree(desc->data);
|
||||
kmem_cache_free(ig.desc_cache, desc);
|
||||
atomic_dec(&ib_conn->post_recv_buf_count);
|
||||
} else { /* type is TX control/command/dataout */
|
||||
if (desc->type == ISCSI_TX_DATAOUT)
|
||||
kmem_cache_free(ig.desc_cache, desc);
|
||||
atomic_dec(&ib_conn->post_send_buf_count);
|
||||
}
|
||||
|
||||
if (atomic_read(&ib_conn->post_recv_buf_count) == 0 &&
|
||||
atomic_read(&ib_conn->post_send_buf_count) == 0)
|
||||
schedule_work(&ib_conn->comperror_work);
|
||||
}
|
||||
|
||||
static void iser_cq_tasklet_fn(unsigned long data)
|
||||
{
|
||||
struct iser_device *device = (struct iser_device *)data;
|
||||
struct ib_cq *cq = device->cq;
|
||||
struct ib_wc wc;
|
||||
struct iser_desc *desc;
|
||||
unsigned long xfer_len;
|
||||
|
||||
while (ib_poll_cq(cq, 1, &wc) == 1) {
|
||||
desc = (struct iser_desc *) (unsigned long) wc.wr_id;
|
||||
BUG_ON(desc == NULL);
|
||||
|
||||
if (wc.status == IB_WC_SUCCESS) {
|
||||
if (desc->type == ISCSI_RX) {
|
||||
xfer_len = (unsigned long)wc.byte_len;
|
||||
iser_rcv_completion(desc, xfer_len);
|
||||
} else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */
|
||||
iser_snd_completion(desc);
|
||||
} else {
|
||||
iser_err("comp w. error op %d status %d\n",desc->type,wc.status);
|
||||
iser_handle_comp_error(desc);
|
||||
}
|
||||
}
|
||||
/* #warning "it is assumed here that arming CQ only once its empty" *
|
||||
* " would not cause interrupts to be missed" */
|
||||
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
|
||||
}
|
||||
|
||||
static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
|
||||
{
|
||||
struct iser_device *device = (struct iser_device *)cq_context;
|
||||
|
||||
tasklet_schedule(&device->cq_tasklet);
|
||||
}
|
||||
|
|
@ -34,6 +34,7 @@ obj-$(CONFIG_SCSI_ISCSI_ATTRS) += scsi_transport_iscsi.o
|
|||
obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o
|
||||
|
||||
obj-$(CONFIG_ISCSI_TCP) += libiscsi.o iscsi_tcp.o
|
||||
obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
|
||||
obj-$(CONFIG_SCSI_AMIGA7XX) += amiga7xx.o 53c7xx.o
|
||||
obj-$(CONFIG_A3000_SCSI) += a3000.o wd33c93.o
|
||||
obj-$(CONFIG_A2091_SCSI) += a2091.o wd33c93.o
|
||||
|
|
|
|||
Loading…
Reference in New Issue