![Bart Van Assche](/assets/img/avatar_default.png)
If an SRP target is no longer reachable and srp_reset_host() fails to reconnect then ib_srp will invoke scsi_remove_host(). That function will invoke __scsi_remove_device() for each LUN. And that last function will change the device state from SDEV_TRANSPORT_OFFLINE into SDEV_CANCEL. Certain user space software, e.g. older versions of multipathd, continue queueing I/O to SCSI devices that are in the SDEV_CANCEL state. If these I/O requests are submitted as SG_IO that means that the REQ_PREEMPT flag will be set and hence that these requests will be passed to srp_queuecommand(). These requests will time out. If new requests are queued fast enough from user space these active requests will prevent __scsi_remove_device() to finish. Avoid this by failing I/O requests in the SDEV_CANCEL state if the transport is offline. Introduce a new variable to keep track of the transport state instead of failing requests if (!target->connected || target->qp_in_error), so that the SCSI error handler has a chance to retry commands after a transport layer failure occurred. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Cc: <stable@vger.kernel.org> # 3.8 Signed-off-by: Roland Dreier <roland@purestorage.com>
2611 lines
68 KiB
C
2611 lines
68 KiB
C
/*
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* Copyright (c) 2005 Cisco Systems. All rights reserved.
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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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#define pr_fmt(fmt) PFX fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/parser.h>
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#include <linux/random.h>
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#include <linux/jiffies.h>
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#include <linux/atomic.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/srp.h>
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#include <scsi/scsi_transport_srp.h>
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#include "ib_srp.h"
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#define DRV_NAME "ib_srp"
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#define PFX DRV_NAME ": "
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#define DRV_VERSION "0.2"
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#define DRV_RELDATE "November 1, 2005"
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MODULE_AUTHOR("Roland Dreier");
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MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
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"v" DRV_VERSION " (" DRV_RELDATE ")");
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MODULE_LICENSE("Dual BSD/GPL");
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static unsigned int srp_sg_tablesize;
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static unsigned int cmd_sg_entries;
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static unsigned int indirect_sg_entries;
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static bool allow_ext_sg;
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static int topspin_workarounds = 1;
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module_param(srp_sg_tablesize, uint, 0444);
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MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
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module_param(cmd_sg_entries, uint, 0444);
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MODULE_PARM_DESC(cmd_sg_entries,
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"Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
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module_param(indirect_sg_entries, uint, 0444);
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MODULE_PARM_DESC(indirect_sg_entries,
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"Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
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module_param(allow_ext_sg, bool, 0444);
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MODULE_PARM_DESC(allow_ext_sg,
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"Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
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module_param(topspin_workarounds, int, 0444);
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MODULE_PARM_DESC(topspin_workarounds,
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"Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
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static void srp_add_one(struct ib_device *device);
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static void srp_remove_one(struct ib_device *device);
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static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
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static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
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static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
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static struct scsi_transport_template *ib_srp_transport_template;
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static struct ib_client srp_client = {
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.name = "srp",
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.add = srp_add_one,
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.remove = srp_remove_one
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};
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static struct ib_sa_client srp_sa_client;
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static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
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{
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return (struct srp_target_port *) host->hostdata;
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}
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static const char *srp_target_info(struct Scsi_Host *host)
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{
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return host_to_target(host)->target_name;
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}
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static int srp_target_is_topspin(struct srp_target_port *target)
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{
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static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
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static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
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return topspin_workarounds &&
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(!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
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!memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
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}
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static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
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gfp_t gfp_mask,
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enum dma_data_direction direction)
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{
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struct srp_iu *iu;
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iu = kmalloc(sizeof *iu, gfp_mask);
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if (!iu)
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goto out;
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iu->buf = kzalloc(size, gfp_mask);
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if (!iu->buf)
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goto out_free_iu;
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iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
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direction);
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if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
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goto out_free_buf;
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iu->size = size;
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iu->direction = direction;
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return iu;
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out_free_buf:
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kfree(iu->buf);
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out_free_iu:
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kfree(iu);
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out:
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return NULL;
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}
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static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
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{
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if (!iu)
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return;
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ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
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iu->direction);
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kfree(iu->buf);
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kfree(iu);
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}
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static void srp_qp_event(struct ib_event *event, void *context)
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{
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pr_debug("QP event %d\n", event->event);
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}
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static int srp_init_qp(struct srp_target_port *target,
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struct ib_qp *qp)
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{
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struct ib_qp_attr *attr;
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int ret;
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attr = kmalloc(sizeof *attr, GFP_KERNEL);
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if (!attr)
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return -ENOMEM;
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ret = ib_find_pkey(target->srp_host->srp_dev->dev,
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target->srp_host->port,
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be16_to_cpu(target->path.pkey),
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&attr->pkey_index);
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if (ret)
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goto out;
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attr->qp_state = IB_QPS_INIT;
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attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
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IB_ACCESS_REMOTE_WRITE);
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attr->port_num = target->srp_host->port;
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ret = ib_modify_qp(qp, attr,
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IB_QP_STATE |
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IB_QP_PKEY_INDEX |
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IB_QP_ACCESS_FLAGS |
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IB_QP_PORT);
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out:
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kfree(attr);
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return ret;
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}
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static int srp_new_cm_id(struct srp_target_port *target)
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{
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struct ib_cm_id *new_cm_id;
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new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
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srp_cm_handler, target);
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if (IS_ERR(new_cm_id))
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return PTR_ERR(new_cm_id);
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if (target->cm_id)
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ib_destroy_cm_id(target->cm_id);
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target->cm_id = new_cm_id;
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return 0;
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}
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static int srp_create_target_ib(struct srp_target_port *target)
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{
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struct ib_qp_init_attr *init_attr;
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struct ib_cq *recv_cq, *send_cq;
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struct ib_qp *qp;
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int ret;
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init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
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if (!init_attr)
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return -ENOMEM;
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recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
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srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
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if (IS_ERR(recv_cq)) {
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ret = PTR_ERR(recv_cq);
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goto err;
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}
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send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
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srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
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if (IS_ERR(send_cq)) {
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ret = PTR_ERR(send_cq);
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goto err_recv_cq;
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}
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ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
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init_attr->event_handler = srp_qp_event;
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init_attr->cap.max_send_wr = SRP_SQ_SIZE;
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init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
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init_attr->cap.max_recv_sge = 1;
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init_attr->cap.max_send_sge = 1;
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init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
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init_attr->qp_type = IB_QPT_RC;
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init_attr->send_cq = send_cq;
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init_attr->recv_cq = recv_cq;
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qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
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if (IS_ERR(qp)) {
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ret = PTR_ERR(qp);
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goto err_send_cq;
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}
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ret = srp_init_qp(target, qp);
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if (ret)
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goto err_qp;
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if (target->qp)
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ib_destroy_qp(target->qp);
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if (target->recv_cq)
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ib_destroy_cq(target->recv_cq);
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if (target->send_cq)
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ib_destroy_cq(target->send_cq);
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target->qp = qp;
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target->recv_cq = recv_cq;
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target->send_cq = send_cq;
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kfree(init_attr);
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return 0;
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err_qp:
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ib_destroy_qp(qp);
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err_send_cq:
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ib_destroy_cq(send_cq);
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err_recv_cq:
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ib_destroy_cq(recv_cq);
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err:
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kfree(init_attr);
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return ret;
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}
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static void srp_free_target_ib(struct srp_target_port *target)
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{
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int i;
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ib_destroy_qp(target->qp);
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ib_destroy_cq(target->send_cq);
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ib_destroy_cq(target->recv_cq);
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target->qp = NULL;
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target->send_cq = target->recv_cq = NULL;
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for (i = 0; i < SRP_RQ_SIZE; ++i)
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srp_free_iu(target->srp_host, target->rx_ring[i]);
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for (i = 0; i < SRP_SQ_SIZE; ++i)
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srp_free_iu(target->srp_host, target->tx_ring[i]);
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}
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static void srp_path_rec_completion(int status,
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struct ib_sa_path_rec *pathrec,
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void *target_ptr)
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{
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struct srp_target_port *target = target_ptr;
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target->status = status;
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if (status)
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shost_printk(KERN_ERR, target->scsi_host,
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PFX "Got failed path rec status %d\n", status);
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else
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target->path = *pathrec;
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complete(&target->done);
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}
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static int srp_lookup_path(struct srp_target_port *target)
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{
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target->path.numb_path = 1;
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init_completion(&target->done);
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target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
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target->srp_host->srp_dev->dev,
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target->srp_host->port,
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&target->path,
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IB_SA_PATH_REC_SERVICE_ID |
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IB_SA_PATH_REC_DGID |
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IB_SA_PATH_REC_SGID |
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IB_SA_PATH_REC_NUMB_PATH |
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IB_SA_PATH_REC_PKEY,
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SRP_PATH_REC_TIMEOUT_MS,
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GFP_KERNEL,
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srp_path_rec_completion,
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target, &target->path_query);
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if (target->path_query_id < 0)
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return target->path_query_id;
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wait_for_completion(&target->done);
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if (target->status < 0)
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shost_printk(KERN_WARNING, target->scsi_host,
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PFX "Path record query failed\n");
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return target->status;
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}
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static int srp_send_req(struct srp_target_port *target)
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{
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struct {
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struct ib_cm_req_param param;
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struct srp_login_req priv;
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} *req = NULL;
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int status;
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req = kzalloc(sizeof *req, GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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req->param.primary_path = &target->path;
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req->param.alternate_path = NULL;
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req->param.service_id = target->service_id;
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req->param.qp_num = target->qp->qp_num;
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req->param.qp_type = target->qp->qp_type;
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req->param.private_data = &req->priv;
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req->param.private_data_len = sizeof req->priv;
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req->param.flow_control = 1;
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get_random_bytes(&req->param.starting_psn, 4);
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req->param.starting_psn &= 0xffffff;
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/*
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* Pick some arbitrary defaults here; we could make these
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* module parameters if anyone cared about setting them.
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*/
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req->param.responder_resources = 4;
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req->param.remote_cm_response_timeout = 20;
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req->param.local_cm_response_timeout = 20;
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req->param.retry_count = 7;
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req->param.rnr_retry_count = 7;
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req->param.max_cm_retries = 15;
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req->priv.opcode = SRP_LOGIN_REQ;
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req->priv.tag = 0;
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req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
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req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
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SRP_BUF_FORMAT_INDIRECT);
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/*
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* In the published SRP specification (draft rev. 16a), the
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* port identifier format is 8 bytes of ID extension followed
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* by 8 bytes of GUID. Older drafts put the two halves in the
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* opposite order, so that the GUID comes first.
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*
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* Targets conforming to these obsolete drafts can be
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* recognized by the I/O Class they report.
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*/
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if (target->io_class == SRP_REV10_IB_IO_CLASS) {
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memcpy(req->priv.initiator_port_id,
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&target->path.sgid.global.interface_id, 8);
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memcpy(req->priv.initiator_port_id + 8,
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&target->initiator_ext, 8);
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memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
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memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
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} else {
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memcpy(req->priv.initiator_port_id,
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&target->initiator_ext, 8);
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memcpy(req->priv.initiator_port_id + 8,
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&target->path.sgid.global.interface_id, 8);
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memcpy(req->priv.target_port_id, &target->id_ext, 8);
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memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
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}
|
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|
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/*
|
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* Topspin/Cisco SRP targets will reject our login unless we
|
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* zero out the first 8 bytes of our initiator port ID and set
|
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* the second 8 bytes to the local node GUID.
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*/
|
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if (srp_target_is_topspin(target)) {
|
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shost_printk(KERN_DEBUG, target->scsi_host,
|
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PFX "Topspin/Cisco initiator port ID workaround "
|
|
"activated for target GUID %016llx\n",
|
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(unsigned long long) be64_to_cpu(target->ioc_guid));
|
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memset(req->priv.initiator_port_id, 0, 8);
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memcpy(req->priv.initiator_port_id + 8,
|
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&target->srp_host->srp_dev->dev->node_guid, 8);
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}
|
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|
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status = ib_send_cm_req(target->cm_id, &req->param);
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|
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kfree(req);
|
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|
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return status;
|
|
}
|
|
|
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static bool srp_queue_remove_work(struct srp_target_port *target)
|
|
{
|
|
bool changed = false;
|
|
|
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spin_lock_irq(&target->lock);
|
|
if (target->state != SRP_TARGET_REMOVED) {
|
|
target->state = SRP_TARGET_REMOVED;
|
|
changed = true;
|
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}
|
|
spin_unlock_irq(&target->lock);
|
|
|
|
if (changed)
|
|
queue_work(system_long_wq, &target->remove_work);
|
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|
|
return changed;
|
|
}
|
|
|
|
static bool srp_change_conn_state(struct srp_target_port *target,
|
|
bool connected)
|
|
{
|
|
bool changed = false;
|
|
|
|
spin_lock_irq(&target->lock);
|
|
if (target->connected != connected) {
|
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target->connected = connected;
|
|
changed = true;
|
|
}
|
|
spin_unlock_irq(&target->lock);
|
|
|
|
return changed;
|
|
}
|
|
|
|
static void srp_disconnect_target(struct srp_target_port *target)
|
|
{
|
|
if (srp_change_conn_state(target, false)) {
|
|
/* XXX should send SRP_I_LOGOUT request */
|
|
|
|
if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
|
|
shost_printk(KERN_DEBUG, target->scsi_host,
|
|
PFX "Sending CM DREQ failed\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
static void srp_free_req_data(struct srp_target_port *target)
|
|
{
|
|
struct ib_device *ibdev = target->srp_host->srp_dev->dev;
|
|
struct srp_request *req;
|
|
int i;
|
|
|
|
for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
|
|
kfree(req->fmr_list);
|
|
kfree(req->map_page);
|
|
if (req->indirect_dma_addr) {
|
|
ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
|
|
target->indirect_size,
|
|
DMA_TO_DEVICE);
|
|
}
|
|
kfree(req->indirect_desc);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* srp_del_scsi_host_attr() - Remove attributes defined in the host template.
|
|
* @shost: SCSI host whose attributes to remove from sysfs.
|
|
*
|
|
* Note: Any attributes defined in the host template and that did not exist
|
|
* before invocation of this function will be ignored.
|
|
*/
|
|
static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
|
|
{
|
|
struct device_attribute **attr;
|
|
|
|
for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
|
|
device_remove_file(&shost->shost_dev, *attr);
|
|
}
|
|
|
|
static void srp_remove_target(struct srp_target_port *target)
|
|
{
|
|
WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
|
|
|
|
srp_del_scsi_host_attr(target->scsi_host);
|
|
srp_remove_host(target->scsi_host);
|
|
scsi_remove_host(target->scsi_host);
|
|
srp_disconnect_target(target);
|
|
ib_destroy_cm_id(target->cm_id);
|
|
srp_free_target_ib(target);
|
|
srp_free_req_data(target);
|
|
scsi_host_put(target->scsi_host);
|
|
}
|
|
|
|
static void srp_remove_work(struct work_struct *work)
|
|
{
|
|
struct srp_target_port *target =
|
|
container_of(work, struct srp_target_port, remove_work);
|
|
|
|
WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
|
|
|
|
spin_lock(&target->srp_host->target_lock);
|
|
list_del(&target->list);
|
|
spin_unlock(&target->srp_host->target_lock);
|
|
|
|
srp_remove_target(target);
|
|
}
|
|
|
|
static void srp_rport_delete(struct srp_rport *rport)
|
|
{
|
|
struct srp_target_port *target = rport->lld_data;
|
|
|
|
srp_queue_remove_work(target);
|
|
}
|
|
|
|
static int srp_connect_target(struct srp_target_port *target)
|
|
{
|
|
int retries = 3;
|
|
int ret;
|
|
|
|
WARN_ON_ONCE(target->connected);
|
|
|
|
target->qp_in_error = false;
|
|
|
|
ret = srp_lookup_path(target);
|
|
if (ret)
|
|
return ret;
|
|
|
|
while (1) {
|
|
init_completion(&target->done);
|
|
ret = srp_send_req(target);
|
|
if (ret)
|
|
return ret;
|
|
wait_for_completion(&target->done);
|
|
|
|
/*
|
|
* The CM event handling code will set status to
|
|
* SRP_PORT_REDIRECT if we get a port redirect REJ
|
|
* back, or SRP_DLID_REDIRECT if we get a lid/qp
|
|
* redirect REJ back.
|
|
*/
|
|
switch (target->status) {
|
|
case 0:
|
|
srp_change_conn_state(target, true);
|
|
return 0;
|
|
|
|
case SRP_PORT_REDIRECT:
|
|
ret = srp_lookup_path(target);
|
|
if (ret)
|
|
return ret;
|
|
break;
|
|
|
|
case SRP_DLID_REDIRECT:
|
|
break;
|
|
|
|
case SRP_STALE_CONN:
|
|
/* Our current CM id was stale, and is now in timewait.
|
|
* Try to reconnect with a new one.
|
|
*/
|
|
if (!retries-- || srp_new_cm_id(target)) {
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX
|
|
"giving up on stale connection\n");
|
|
target->status = -ECONNRESET;
|
|
return target->status;
|
|
}
|
|
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX
|
|
"retrying stale connection\n");
|
|
break;
|
|
|
|
default:
|
|
return target->status;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void srp_unmap_data(struct scsi_cmnd *scmnd,
|
|
struct srp_target_port *target,
|
|
struct srp_request *req)
|
|
{
|
|
struct ib_device *ibdev = target->srp_host->srp_dev->dev;
|
|
struct ib_pool_fmr **pfmr;
|
|
|
|
if (!scsi_sglist(scmnd) ||
|
|
(scmnd->sc_data_direction != DMA_TO_DEVICE &&
|
|
scmnd->sc_data_direction != DMA_FROM_DEVICE))
|
|
return;
|
|
|
|
pfmr = req->fmr_list;
|
|
while (req->nfmr--)
|
|
ib_fmr_pool_unmap(*pfmr++);
|
|
|
|
ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
|
|
scmnd->sc_data_direction);
|
|
}
|
|
|
|
/**
|
|
* srp_claim_req - Take ownership of the scmnd associated with a request.
|
|
* @target: SRP target port.
|
|
* @req: SRP request.
|
|
* @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
|
|
* ownership of @req->scmnd if it equals @scmnd.
|
|
*
|
|
* Return value:
|
|
* Either NULL or a pointer to the SCSI command the caller became owner of.
|
|
*/
|
|
static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
|
|
struct srp_request *req,
|
|
struct scsi_cmnd *scmnd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
if (!scmnd) {
|
|
scmnd = req->scmnd;
|
|
req->scmnd = NULL;
|
|
} else if (req->scmnd == scmnd) {
|
|
req->scmnd = NULL;
|
|
} else {
|
|
scmnd = NULL;
|
|
}
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
|
|
return scmnd;
|
|
}
|
|
|
|
/**
|
|
* srp_free_req() - Unmap data and add request to the free request list.
|
|
*/
|
|
static void srp_free_req(struct srp_target_port *target,
|
|
struct srp_request *req, struct scsi_cmnd *scmnd,
|
|
s32 req_lim_delta)
|
|
{
|
|
unsigned long flags;
|
|
|
|
srp_unmap_data(scmnd, target, req);
|
|
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
target->req_lim += req_lim_delta;
|
|
list_add_tail(&req->list, &target->free_reqs);
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
}
|
|
|
|
static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
|
|
{
|
|
struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
|
|
|
|
if (scmnd) {
|
|
srp_free_req(target, req, scmnd, 0);
|
|
scmnd->result = DID_RESET << 16;
|
|
scmnd->scsi_done(scmnd);
|
|
}
|
|
}
|
|
|
|
static int srp_reconnect_target(struct srp_target_port *target)
|
|
{
|
|
struct Scsi_Host *shost = target->scsi_host;
|
|
int i, ret;
|
|
|
|
scsi_target_block(&shost->shost_gendev);
|
|
|
|
srp_disconnect_target(target);
|
|
/*
|
|
* Now get a new local CM ID so that we avoid confusing the target in
|
|
* case things are really fouled up. Doing so also ensures that all CM
|
|
* callbacks will have finished before a new QP is allocated.
|
|
*/
|
|
ret = srp_new_cm_id(target);
|
|
/*
|
|
* Whether or not creating a new CM ID succeeded, create a new
|
|
* QP. This guarantees that all completion callback function
|
|
* invocations have finished before request resetting starts.
|
|
*/
|
|
if (ret == 0)
|
|
ret = srp_create_target_ib(target);
|
|
else
|
|
srp_create_target_ib(target);
|
|
|
|
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
|
|
struct srp_request *req = &target->req_ring[i];
|
|
if (req->scmnd)
|
|
srp_reset_req(target, req);
|
|
}
|
|
|
|
INIT_LIST_HEAD(&target->free_tx);
|
|
for (i = 0; i < SRP_SQ_SIZE; ++i)
|
|
list_add(&target->tx_ring[i]->list, &target->free_tx);
|
|
|
|
if (ret == 0)
|
|
ret = srp_connect_target(target);
|
|
|
|
scsi_target_unblock(&shost->shost_gendev, ret == 0 ? SDEV_RUNNING :
|
|
SDEV_TRANSPORT_OFFLINE);
|
|
target->transport_offline = !!ret;
|
|
|
|
if (ret)
|
|
goto err;
|
|
|
|
shost_printk(KERN_INFO, target->scsi_host, PFX "reconnect succeeded\n");
|
|
|
|
return ret;
|
|
|
|
err:
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "reconnect failed (%d), removing target port.\n", ret);
|
|
|
|
/*
|
|
* We couldn't reconnect, so kill our target port off.
|
|
* However, we have to defer the real removal because we
|
|
* are in the context of the SCSI error handler now, which
|
|
* will deadlock if we call scsi_remove_host().
|
|
*/
|
|
srp_queue_remove_work(target);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
|
|
unsigned int dma_len, u32 rkey)
|
|
{
|
|
struct srp_direct_buf *desc = state->desc;
|
|
|
|
desc->va = cpu_to_be64(dma_addr);
|
|
desc->key = cpu_to_be32(rkey);
|
|
desc->len = cpu_to_be32(dma_len);
|
|
|
|
state->total_len += dma_len;
|
|
state->desc++;
|
|
state->ndesc++;
|
|
}
|
|
|
|
static int srp_map_finish_fmr(struct srp_map_state *state,
|
|
struct srp_target_port *target)
|
|
{
|
|
struct srp_device *dev = target->srp_host->srp_dev;
|
|
struct ib_pool_fmr *fmr;
|
|
u64 io_addr = 0;
|
|
|
|
if (!state->npages)
|
|
return 0;
|
|
|
|
if (state->npages == 1) {
|
|
srp_map_desc(state, state->base_dma_addr, state->fmr_len,
|
|
target->rkey);
|
|
state->npages = state->fmr_len = 0;
|
|
return 0;
|
|
}
|
|
|
|
fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
|
|
state->npages, io_addr);
|
|
if (IS_ERR(fmr))
|
|
return PTR_ERR(fmr);
|
|
|
|
*state->next_fmr++ = fmr;
|
|
state->nfmr++;
|
|
|
|
srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
|
|
state->npages = state->fmr_len = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void srp_map_update_start(struct srp_map_state *state,
|
|
struct scatterlist *sg, int sg_index,
|
|
dma_addr_t dma_addr)
|
|
{
|
|
state->unmapped_sg = sg;
|
|
state->unmapped_index = sg_index;
|
|
state->unmapped_addr = dma_addr;
|
|
}
|
|
|
|
static int srp_map_sg_entry(struct srp_map_state *state,
|
|
struct srp_target_port *target,
|
|
struct scatterlist *sg, int sg_index,
|
|
int use_fmr)
|
|
{
|
|
struct srp_device *dev = target->srp_host->srp_dev;
|
|
struct ib_device *ibdev = dev->dev;
|
|
dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
|
|
unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
|
|
unsigned int len;
|
|
int ret;
|
|
|
|
if (!dma_len)
|
|
return 0;
|
|
|
|
if (use_fmr == SRP_MAP_NO_FMR) {
|
|
/* Once we're in direct map mode for a request, we don't
|
|
* go back to FMR mode, so no need to update anything
|
|
* other than the descriptor.
|
|
*/
|
|
srp_map_desc(state, dma_addr, dma_len, target->rkey);
|
|
return 0;
|
|
}
|
|
|
|
/* If we start at an offset into the FMR page, don't merge into
|
|
* the current FMR. Finish it out, and use the kernel's MR for this
|
|
* sg entry. This is to avoid potential bugs on some SRP targets
|
|
* that were never quite defined, but went away when the initiator
|
|
* avoided using FMR on such page fragments.
|
|
*/
|
|
if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
|
|
ret = srp_map_finish_fmr(state, target);
|
|
if (ret)
|
|
return ret;
|
|
|
|
srp_map_desc(state, dma_addr, dma_len, target->rkey);
|
|
srp_map_update_start(state, NULL, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
/* If this is the first sg to go into the FMR, save our position.
|
|
* We need to know the first unmapped entry, its index, and the
|
|
* first unmapped address within that entry to be able to restart
|
|
* mapping after an error.
|
|
*/
|
|
if (!state->unmapped_sg)
|
|
srp_map_update_start(state, sg, sg_index, dma_addr);
|
|
|
|
while (dma_len) {
|
|
if (state->npages == SRP_FMR_SIZE) {
|
|
ret = srp_map_finish_fmr(state, target);
|
|
if (ret)
|
|
return ret;
|
|
|
|
srp_map_update_start(state, sg, sg_index, dma_addr);
|
|
}
|
|
|
|
len = min_t(unsigned int, dma_len, dev->fmr_page_size);
|
|
|
|
if (!state->npages)
|
|
state->base_dma_addr = dma_addr;
|
|
state->pages[state->npages++] = dma_addr;
|
|
state->fmr_len += len;
|
|
dma_addr += len;
|
|
dma_len -= len;
|
|
}
|
|
|
|
/* If the last entry of the FMR wasn't a full page, then we need to
|
|
* close it out and start a new one -- we can only merge at page
|
|
* boundries.
|
|
*/
|
|
ret = 0;
|
|
if (len != dev->fmr_page_size) {
|
|
ret = srp_map_finish_fmr(state, target);
|
|
if (!ret)
|
|
srp_map_update_start(state, NULL, 0, 0);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
|
|
struct srp_request *req)
|
|
{
|
|
struct scatterlist *scat, *sg;
|
|
struct srp_cmd *cmd = req->cmd->buf;
|
|
int i, len, nents, count, use_fmr;
|
|
struct srp_device *dev;
|
|
struct ib_device *ibdev;
|
|
struct srp_map_state state;
|
|
struct srp_indirect_buf *indirect_hdr;
|
|
u32 table_len;
|
|
u8 fmt;
|
|
|
|
if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
|
|
return sizeof (struct srp_cmd);
|
|
|
|
if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
|
|
scmnd->sc_data_direction != DMA_TO_DEVICE) {
|
|
shost_printk(KERN_WARNING, target->scsi_host,
|
|
PFX "Unhandled data direction %d\n",
|
|
scmnd->sc_data_direction);
|
|
return -EINVAL;
|
|
}
|
|
|
|
nents = scsi_sg_count(scmnd);
|
|
scat = scsi_sglist(scmnd);
|
|
|
|
dev = target->srp_host->srp_dev;
|
|
ibdev = dev->dev;
|
|
|
|
count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
|
|
if (unlikely(count == 0))
|
|
return -EIO;
|
|
|
|
fmt = SRP_DATA_DESC_DIRECT;
|
|
len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
|
|
|
|
if (count == 1) {
|
|
/*
|
|
* The midlayer only generated a single gather/scatter
|
|
* entry, or DMA mapping coalesced everything to a
|
|
* single entry. So a direct descriptor along with
|
|
* the DMA MR suffices.
|
|
*/
|
|
struct srp_direct_buf *buf = (void *) cmd->add_data;
|
|
|
|
buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
|
|
buf->key = cpu_to_be32(target->rkey);
|
|
buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
|
|
|
|
req->nfmr = 0;
|
|
goto map_complete;
|
|
}
|
|
|
|
/* We have more than one scatter/gather entry, so build our indirect
|
|
* descriptor table, trying to merge as many entries with FMR as we
|
|
* can.
|
|
*/
|
|
indirect_hdr = (void *) cmd->add_data;
|
|
|
|
ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
|
|
target->indirect_size, DMA_TO_DEVICE);
|
|
|
|
memset(&state, 0, sizeof(state));
|
|
state.desc = req->indirect_desc;
|
|
state.pages = req->map_page;
|
|
state.next_fmr = req->fmr_list;
|
|
|
|
use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;
|
|
|
|
for_each_sg(scat, sg, count, i) {
|
|
if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
|
|
/* FMR mapping failed, so backtrack to the first
|
|
* unmapped entry and continue on without using FMR.
|
|
*/
|
|
dma_addr_t dma_addr;
|
|
unsigned int dma_len;
|
|
|
|
backtrack:
|
|
sg = state.unmapped_sg;
|
|
i = state.unmapped_index;
|
|
|
|
dma_addr = ib_sg_dma_address(ibdev, sg);
|
|
dma_len = ib_sg_dma_len(ibdev, sg);
|
|
dma_len -= (state.unmapped_addr - dma_addr);
|
|
dma_addr = state.unmapped_addr;
|
|
use_fmr = SRP_MAP_NO_FMR;
|
|
srp_map_desc(&state, dma_addr, dma_len, target->rkey);
|
|
}
|
|
}
|
|
|
|
if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
|
|
goto backtrack;
|
|
|
|
/* We've mapped the request, now pull as much of the indirect
|
|
* descriptor table as we can into the command buffer. If this
|
|
* target is not using an external indirect table, we are
|
|
* guaranteed to fit into the command, as the SCSI layer won't
|
|
* give us more S/G entries than we allow.
|
|
*/
|
|
req->nfmr = state.nfmr;
|
|
if (state.ndesc == 1) {
|
|
/* FMR mapping was able to collapse this to one entry,
|
|
* so use a direct descriptor.
|
|
*/
|
|
struct srp_direct_buf *buf = (void *) cmd->add_data;
|
|
|
|
*buf = req->indirect_desc[0];
|
|
goto map_complete;
|
|
}
|
|
|
|
if (unlikely(target->cmd_sg_cnt < state.ndesc &&
|
|
!target->allow_ext_sg)) {
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
"Could not fit S/G list into SRP_CMD\n");
|
|
return -EIO;
|
|
}
|
|
|
|
count = min(state.ndesc, target->cmd_sg_cnt);
|
|
table_len = state.ndesc * sizeof (struct srp_direct_buf);
|
|
|
|
fmt = SRP_DATA_DESC_INDIRECT;
|
|
len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
|
|
len += count * sizeof (struct srp_direct_buf);
|
|
|
|
memcpy(indirect_hdr->desc_list, req->indirect_desc,
|
|
count * sizeof (struct srp_direct_buf));
|
|
|
|
indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
|
|
indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
|
|
indirect_hdr->table_desc.len = cpu_to_be32(table_len);
|
|
indirect_hdr->len = cpu_to_be32(state.total_len);
|
|
|
|
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
|
|
cmd->data_out_desc_cnt = count;
|
|
else
|
|
cmd->data_in_desc_cnt = count;
|
|
|
|
ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
|
|
DMA_TO_DEVICE);
|
|
|
|
map_complete:
|
|
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
|
|
cmd->buf_fmt = fmt << 4;
|
|
else
|
|
cmd->buf_fmt = fmt;
|
|
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* Return an IU and possible credit to the free pool
|
|
*/
|
|
static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
|
|
enum srp_iu_type iu_type)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
list_add(&iu->list, &target->free_tx);
|
|
if (iu_type != SRP_IU_RSP)
|
|
++target->req_lim;
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Must be called with target->lock held to protect req_lim and free_tx.
|
|
* If IU is not sent, it must be returned using srp_put_tx_iu().
|
|
*
|
|
* Note:
|
|
* An upper limit for the number of allocated information units for each
|
|
* request type is:
|
|
* - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
|
|
* more than Scsi_Host.can_queue requests.
|
|
* - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
|
|
* - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
|
|
* one unanswered SRP request to an initiator.
|
|
*/
|
|
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
|
|
enum srp_iu_type iu_type)
|
|
{
|
|
s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
|
|
struct srp_iu *iu;
|
|
|
|
srp_send_completion(target->send_cq, target);
|
|
|
|
if (list_empty(&target->free_tx))
|
|
return NULL;
|
|
|
|
/* Initiator responses to target requests do not consume credits */
|
|
if (iu_type != SRP_IU_RSP) {
|
|
if (target->req_lim <= rsv) {
|
|
++target->zero_req_lim;
|
|
return NULL;
|
|
}
|
|
|
|
--target->req_lim;
|
|
}
|
|
|
|
iu = list_first_entry(&target->free_tx, struct srp_iu, list);
|
|
list_del(&iu->list);
|
|
return iu;
|
|
}
|
|
|
|
static int srp_post_send(struct srp_target_port *target,
|
|
struct srp_iu *iu, int len)
|
|
{
|
|
struct ib_sge list;
|
|
struct ib_send_wr wr, *bad_wr;
|
|
|
|
list.addr = iu->dma;
|
|
list.length = len;
|
|
list.lkey = target->lkey;
|
|
|
|
wr.next = NULL;
|
|
wr.wr_id = (uintptr_t) iu;
|
|
wr.sg_list = &list;
|
|
wr.num_sge = 1;
|
|
wr.opcode = IB_WR_SEND;
|
|
wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
return ib_post_send(target->qp, &wr, &bad_wr);
|
|
}
|
|
|
|
static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
|
|
{
|
|
struct ib_recv_wr wr, *bad_wr;
|
|
struct ib_sge list;
|
|
|
|
list.addr = iu->dma;
|
|
list.length = iu->size;
|
|
list.lkey = target->lkey;
|
|
|
|
wr.next = NULL;
|
|
wr.wr_id = (uintptr_t) iu;
|
|
wr.sg_list = &list;
|
|
wr.num_sge = 1;
|
|
|
|
return ib_post_recv(target->qp, &wr, &bad_wr);
|
|
}
|
|
|
|
static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
|
|
{
|
|
struct srp_request *req;
|
|
struct scsi_cmnd *scmnd;
|
|
unsigned long flags;
|
|
|
|
if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
target->req_lim += be32_to_cpu(rsp->req_lim_delta);
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
|
|
target->tsk_mgmt_status = -1;
|
|
if (be32_to_cpu(rsp->resp_data_len) >= 4)
|
|
target->tsk_mgmt_status = rsp->data[3];
|
|
complete(&target->tsk_mgmt_done);
|
|
} else {
|
|
req = &target->req_ring[rsp->tag];
|
|
scmnd = srp_claim_req(target, req, NULL);
|
|
if (!scmnd) {
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
"Null scmnd for RSP w/tag %016llx\n",
|
|
(unsigned long long) rsp->tag);
|
|
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
target->req_lim += be32_to_cpu(rsp->req_lim_delta);
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
|
|
return;
|
|
}
|
|
scmnd->result = rsp->status;
|
|
|
|
if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
|
|
memcpy(scmnd->sense_buffer, rsp->data +
|
|
be32_to_cpu(rsp->resp_data_len),
|
|
min_t(int, be32_to_cpu(rsp->sense_data_len),
|
|
SCSI_SENSE_BUFFERSIZE));
|
|
}
|
|
|
|
if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
|
|
scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
|
|
else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
|
|
scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
|
|
|
|
srp_free_req(target, req, scmnd,
|
|
be32_to_cpu(rsp->req_lim_delta));
|
|
|
|
scmnd->host_scribble = NULL;
|
|
scmnd->scsi_done(scmnd);
|
|
}
|
|
}
|
|
|
|
static int srp_response_common(struct srp_target_port *target, s32 req_delta,
|
|
void *rsp, int len)
|
|
{
|
|
struct ib_device *dev = target->srp_host->srp_dev->dev;
|
|
unsigned long flags;
|
|
struct srp_iu *iu;
|
|
int err;
|
|
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
target->req_lim += req_delta;
|
|
iu = __srp_get_tx_iu(target, SRP_IU_RSP);
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
|
|
if (!iu) {
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX
|
|
"no IU available to send response\n");
|
|
return 1;
|
|
}
|
|
|
|
ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
|
|
memcpy(iu->buf, rsp, len);
|
|
ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
|
|
|
|
err = srp_post_send(target, iu, len);
|
|
if (err) {
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX
|
|
"unable to post response: %d\n", err);
|
|
srp_put_tx_iu(target, iu, SRP_IU_RSP);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void srp_process_cred_req(struct srp_target_port *target,
|
|
struct srp_cred_req *req)
|
|
{
|
|
struct srp_cred_rsp rsp = {
|
|
.opcode = SRP_CRED_RSP,
|
|
.tag = req->tag,
|
|
};
|
|
s32 delta = be32_to_cpu(req->req_lim_delta);
|
|
|
|
if (srp_response_common(target, delta, &rsp, sizeof rsp))
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX
|
|
"problems processing SRP_CRED_REQ\n");
|
|
}
|
|
|
|
static void srp_process_aer_req(struct srp_target_port *target,
|
|
struct srp_aer_req *req)
|
|
{
|
|
struct srp_aer_rsp rsp = {
|
|
.opcode = SRP_AER_RSP,
|
|
.tag = req->tag,
|
|
};
|
|
s32 delta = be32_to_cpu(req->req_lim_delta);
|
|
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX
|
|
"ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
|
|
|
|
if (srp_response_common(target, delta, &rsp, sizeof rsp))
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX
|
|
"problems processing SRP_AER_REQ\n");
|
|
}
|
|
|
|
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
|
|
{
|
|
struct ib_device *dev = target->srp_host->srp_dev->dev;
|
|
struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
|
|
int res;
|
|
u8 opcode;
|
|
|
|
ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
|
|
DMA_FROM_DEVICE);
|
|
|
|
opcode = *(u8 *) iu->buf;
|
|
|
|
if (0) {
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "recv completion, opcode 0x%02x\n", opcode);
|
|
print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
|
|
iu->buf, wc->byte_len, true);
|
|
}
|
|
|
|
switch (opcode) {
|
|
case SRP_RSP:
|
|
srp_process_rsp(target, iu->buf);
|
|
break;
|
|
|
|
case SRP_CRED_REQ:
|
|
srp_process_cred_req(target, iu->buf);
|
|
break;
|
|
|
|
case SRP_AER_REQ:
|
|
srp_process_aer_req(target, iu->buf);
|
|
break;
|
|
|
|
case SRP_T_LOGOUT:
|
|
/* XXX Handle target logout */
|
|
shost_printk(KERN_WARNING, target->scsi_host,
|
|
PFX "Got target logout request\n");
|
|
break;
|
|
|
|
default:
|
|
shost_printk(KERN_WARNING, target->scsi_host,
|
|
PFX "Unhandled SRP opcode 0x%02x\n", opcode);
|
|
break;
|
|
}
|
|
|
|
ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
|
|
DMA_FROM_DEVICE);
|
|
|
|
res = srp_post_recv(target, iu);
|
|
if (res != 0)
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "Recv failed with error code %d\n", res);
|
|
}
|
|
|
|
static void srp_handle_qp_err(enum ib_wc_status wc_status,
|
|
enum ib_wc_opcode wc_opcode,
|
|
struct srp_target_port *target)
|
|
{
|
|
if (target->connected && !target->qp_in_error) {
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "failed %s status %d\n",
|
|
wc_opcode & IB_WC_RECV ? "receive" : "send",
|
|
wc_status);
|
|
}
|
|
target->qp_in_error = true;
|
|
}
|
|
|
|
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
|
|
{
|
|
struct srp_target_port *target = target_ptr;
|
|
struct ib_wc wc;
|
|
|
|
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
|
|
while (ib_poll_cq(cq, 1, &wc) > 0) {
|
|
if (likely(wc.status == IB_WC_SUCCESS)) {
|
|
srp_handle_recv(target, &wc);
|
|
} else {
|
|
srp_handle_qp_err(wc.status, wc.opcode, target);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
|
|
{
|
|
struct srp_target_port *target = target_ptr;
|
|
struct ib_wc wc;
|
|
struct srp_iu *iu;
|
|
|
|
while (ib_poll_cq(cq, 1, &wc) > 0) {
|
|
if (likely(wc.status == IB_WC_SUCCESS)) {
|
|
iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
|
|
list_add(&iu->list, &target->free_tx);
|
|
} else {
|
|
srp_handle_qp_err(wc.status, wc.opcode, target);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
|
|
{
|
|
struct srp_target_port *target = host_to_target(shost);
|
|
struct srp_request *req;
|
|
struct srp_iu *iu;
|
|
struct srp_cmd *cmd;
|
|
struct ib_device *dev;
|
|
unsigned long flags;
|
|
int len;
|
|
|
|
if (unlikely(target->transport_offline)) {
|
|
scmnd->result = DID_NO_CONNECT << 16;
|
|
scmnd->scsi_done(scmnd);
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
iu = __srp_get_tx_iu(target, SRP_IU_CMD);
|
|
if (!iu)
|
|
goto err_unlock;
|
|
|
|
req = list_first_entry(&target->free_reqs, struct srp_request, list);
|
|
list_del(&req->list);
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
|
|
dev = target->srp_host->srp_dev->dev;
|
|
ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
|
|
DMA_TO_DEVICE);
|
|
|
|
scmnd->result = 0;
|
|
scmnd->host_scribble = (void *) req;
|
|
|
|
cmd = iu->buf;
|
|
memset(cmd, 0, sizeof *cmd);
|
|
|
|
cmd->opcode = SRP_CMD;
|
|
cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
|
|
cmd->tag = req->index;
|
|
memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
|
|
|
|
req->scmnd = scmnd;
|
|
req->cmd = iu;
|
|
|
|
len = srp_map_data(scmnd, target, req);
|
|
if (len < 0) {
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "Failed to map data\n");
|
|
goto err_iu;
|
|
}
|
|
|
|
ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
|
|
DMA_TO_DEVICE);
|
|
|
|
if (srp_post_send(target, iu, len)) {
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
|
|
goto err_unmap;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_unmap:
|
|
srp_unmap_data(scmnd, target, req);
|
|
|
|
err_iu:
|
|
srp_put_tx_iu(target, iu, SRP_IU_CMD);
|
|
|
|
spin_lock_irqsave(&target->lock, flags);
|
|
list_add(&req->list, &target->free_reqs);
|
|
|
|
err_unlock:
|
|
spin_unlock_irqrestore(&target->lock, flags);
|
|
|
|
return SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
|
|
static int srp_alloc_iu_bufs(struct srp_target_port *target)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < SRP_RQ_SIZE; ++i) {
|
|
target->rx_ring[i] = srp_alloc_iu(target->srp_host,
|
|
target->max_ti_iu_len,
|
|
GFP_KERNEL, DMA_FROM_DEVICE);
|
|
if (!target->rx_ring[i])
|
|
goto err;
|
|
}
|
|
|
|
for (i = 0; i < SRP_SQ_SIZE; ++i) {
|
|
target->tx_ring[i] = srp_alloc_iu(target->srp_host,
|
|
target->max_iu_len,
|
|
GFP_KERNEL, DMA_TO_DEVICE);
|
|
if (!target->tx_ring[i])
|
|
goto err;
|
|
|
|
list_add(&target->tx_ring[i]->list, &target->free_tx);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
for (i = 0; i < SRP_RQ_SIZE; ++i) {
|
|
srp_free_iu(target->srp_host, target->rx_ring[i]);
|
|
target->rx_ring[i] = NULL;
|
|
}
|
|
|
|
for (i = 0; i < SRP_SQ_SIZE; ++i) {
|
|
srp_free_iu(target->srp_host, target->tx_ring[i]);
|
|
target->tx_ring[i] = NULL;
|
|
}
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
|
|
{
|
|
uint64_t T_tr_ns, max_compl_time_ms;
|
|
uint32_t rq_tmo_jiffies;
|
|
|
|
/*
|
|
* According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
|
|
* table 91), both the QP timeout and the retry count have to be set
|
|
* for RC QP's during the RTR to RTS transition.
|
|
*/
|
|
WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
|
|
(IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
|
|
|
|
/*
|
|
* Set target->rq_tmo_jiffies to one second more than the largest time
|
|
* it can take before an error completion is generated. See also
|
|
* C9-140..142 in the IBTA spec for more information about how to
|
|
* convert the QP Local ACK Timeout value to nanoseconds.
|
|
*/
|
|
T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
|
|
max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
|
|
do_div(max_compl_time_ms, NSEC_PER_MSEC);
|
|
rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
|
|
|
|
return rq_tmo_jiffies;
|
|
}
|
|
|
|
static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
|
|
struct srp_login_rsp *lrsp,
|
|
struct srp_target_port *target)
|
|
{
|
|
struct ib_qp_attr *qp_attr = NULL;
|
|
int attr_mask = 0;
|
|
int ret;
|
|
int i;
|
|
|
|
if (lrsp->opcode == SRP_LOGIN_RSP) {
|
|
target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
|
|
target->req_lim = be32_to_cpu(lrsp->req_lim_delta);
|
|
|
|
/*
|
|
* Reserve credits for task management so we don't
|
|
* bounce requests back to the SCSI mid-layer.
|
|
*/
|
|
target->scsi_host->can_queue
|
|
= min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
|
|
target->scsi_host->can_queue);
|
|
} else {
|
|
shost_printk(KERN_WARNING, target->scsi_host,
|
|
PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
|
|
ret = -ECONNRESET;
|
|
goto error;
|
|
}
|
|
|
|
if (!target->rx_ring[0]) {
|
|
ret = srp_alloc_iu_bufs(target);
|
|
if (ret)
|
|
goto error;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
|
|
if (!qp_attr)
|
|
goto error;
|
|
|
|
qp_attr->qp_state = IB_QPS_RTR;
|
|
ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
|
|
if (ret)
|
|
goto error_free;
|
|
|
|
ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
|
|
if (ret)
|
|
goto error_free;
|
|
|
|
for (i = 0; i < SRP_RQ_SIZE; i++) {
|
|
struct srp_iu *iu = target->rx_ring[i];
|
|
ret = srp_post_recv(target, iu);
|
|
if (ret)
|
|
goto error_free;
|
|
}
|
|
|
|
qp_attr->qp_state = IB_QPS_RTS;
|
|
ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
|
|
if (ret)
|
|
goto error_free;
|
|
|
|
target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
|
|
|
|
ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
|
|
if (ret)
|
|
goto error_free;
|
|
|
|
ret = ib_send_cm_rtu(cm_id, NULL, 0);
|
|
|
|
error_free:
|
|
kfree(qp_attr);
|
|
|
|
error:
|
|
target->status = ret;
|
|
}
|
|
|
|
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
|
|
struct ib_cm_event *event,
|
|
struct srp_target_port *target)
|
|
{
|
|
struct Scsi_Host *shost = target->scsi_host;
|
|
struct ib_class_port_info *cpi;
|
|
int opcode;
|
|
|
|
switch (event->param.rej_rcvd.reason) {
|
|
case IB_CM_REJ_PORT_CM_REDIRECT:
|
|
cpi = event->param.rej_rcvd.ari;
|
|
target->path.dlid = cpi->redirect_lid;
|
|
target->path.pkey = cpi->redirect_pkey;
|
|
cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
|
|
memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
|
|
|
|
target->status = target->path.dlid ?
|
|
SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
|
|
break;
|
|
|
|
case IB_CM_REJ_PORT_REDIRECT:
|
|
if (srp_target_is_topspin(target)) {
|
|
/*
|
|
* Topspin/Cisco SRP gateways incorrectly send
|
|
* reject reason code 25 when they mean 24
|
|
* (port redirect).
|
|
*/
|
|
memcpy(target->path.dgid.raw,
|
|
event->param.rej_rcvd.ari, 16);
|
|
|
|
shost_printk(KERN_DEBUG, shost,
|
|
PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
|
|
(unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
|
|
(unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
|
|
|
|
target->status = SRP_PORT_REDIRECT;
|
|
} else {
|
|
shost_printk(KERN_WARNING, shost,
|
|
" REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
|
|
target->status = -ECONNRESET;
|
|
}
|
|
break;
|
|
|
|
case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
|
|
shost_printk(KERN_WARNING, shost,
|
|
" REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
|
|
target->status = -ECONNRESET;
|
|
break;
|
|
|
|
case IB_CM_REJ_CONSUMER_DEFINED:
|
|
opcode = *(u8 *) event->private_data;
|
|
if (opcode == SRP_LOGIN_REJ) {
|
|
struct srp_login_rej *rej = event->private_data;
|
|
u32 reason = be32_to_cpu(rej->reason);
|
|
|
|
if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
|
|
shost_printk(KERN_WARNING, shost,
|
|
PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
|
|
else
|
|
shost_printk(KERN_WARNING, shost,
|
|
PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
|
|
} else
|
|
shost_printk(KERN_WARNING, shost,
|
|
" REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
|
|
" opcode 0x%02x\n", opcode);
|
|
target->status = -ECONNRESET;
|
|
break;
|
|
|
|
case IB_CM_REJ_STALE_CONN:
|
|
shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
|
|
target->status = SRP_STALE_CONN;
|
|
break;
|
|
|
|
default:
|
|
shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
|
|
event->param.rej_rcvd.reason);
|
|
target->status = -ECONNRESET;
|
|
}
|
|
}
|
|
|
|
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
|
|
{
|
|
struct srp_target_port *target = cm_id->context;
|
|
int comp = 0;
|
|
|
|
switch (event->event) {
|
|
case IB_CM_REQ_ERROR:
|
|
shost_printk(KERN_DEBUG, target->scsi_host,
|
|
PFX "Sending CM REQ failed\n");
|
|
comp = 1;
|
|
target->status = -ECONNRESET;
|
|
break;
|
|
|
|
case IB_CM_REP_RECEIVED:
|
|
comp = 1;
|
|
srp_cm_rep_handler(cm_id, event->private_data, target);
|
|
break;
|
|
|
|
case IB_CM_REJ_RECEIVED:
|
|
shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
|
|
comp = 1;
|
|
|
|
srp_cm_rej_handler(cm_id, event, target);
|
|
break;
|
|
|
|
case IB_CM_DREQ_RECEIVED:
|
|
shost_printk(KERN_WARNING, target->scsi_host,
|
|
PFX "DREQ received - connection closed\n");
|
|
srp_change_conn_state(target, false);
|
|
if (ib_send_cm_drep(cm_id, NULL, 0))
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "Sending CM DREP failed\n");
|
|
break;
|
|
|
|
case IB_CM_TIMEWAIT_EXIT:
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "connection closed\n");
|
|
|
|
target->status = 0;
|
|
break;
|
|
|
|
case IB_CM_MRA_RECEIVED:
|
|
case IB_CM_DREQ_ERROR:
|
|
case IB_CM_DREP_RECEIVED:
|
|
break;
|
|
|
|
default:
|
|
shost_printk(KERN_WARNING, target->scsi_host,
|
|
PFX "Unhandled CM event %d\n", event->event);
|
|
break;
|
|
}
|
|
|
|
if (comp)
|
|
complete(&target->done);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int srp_send_tsk_mgmt(struct srp_target_port *target,
|
|
u64 req_tag, unsigned int lun, u8 func)
|
|
{
|
|
struct ib_device *dev = target->srp_host->srp_dev->dev;
|
|
struct srp_iu *iu;
|
|
struct srp_tsk_mgmt *tsk_mgmt;
|
|
|
|
if (!target->connected || target->qp_in_error)
|
|
return -1;
|
|
|
|
init_completion(&target->tsk_mgmt_done);
|
|
|
|
spin_lock_irq(&target->lock);
|
|
iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
|
|
spin_unlock_irq(&target->lock);
|
|
|
|
if (!iu)
|
|
return -1;
|
|
|
|
ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
|
|
DMA_TO_DEVICE);
|
|
tsk_mgmt = iu->buf;
|
|
memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
|
|
|
|
tsk_mgmt->opcode = SRP_TSK_MGMT;
|
|
tsk_mgmt->lun = cpu_to_be64((u64) lun << 48);
|
|
tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
|
|
tsk_mgmt->tsk_mgmt_func = func;
|
|
tsk_mgmt->task_tag = req_tag;
|
|
|
|
ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
|
|
DMA_TO_DEVICE);
|
|
if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
|
|
srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
|
|
return -1;
|
|
}
|
|
|
|
if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
|
|
msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int srp_abort(struct scsi_cmnd *scmnd)
|
|
{
|
|
struct srp_target_port *target = host_to_target(scmnd->device->host);
|
|
struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
|
|
|
|
shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
|
|
|
|
if (!req || !srp_claim_req(target, req, scmnd))
|
|
return FAILED;
|
|
srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
|
|
SRP_TSK_ABORT_TASK);
|
|
srp_free_req(target, req, scmnd, 0);
|
|
scmnd->result = DID_ABORT << 16;
|
|
scmnd->scsi_done(scmnd);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int srp_reset_device(struct scsi_cmnd *scmnd)
|
|
{
|
|
struct srp_target_port *target = host_to_target(scmnd->device->host);
|
|
int i;
|
|
|
|
shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
|
|
|
|
if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
|
|
SRP_TSK_LUN_RESET))
|
|
return FAILED;
|
|
if (target->tsk_mgmt_status)
|
|
return FAILED;
|
|
|
|
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
|
|
struct srp_request *req = &target->req_ring[i];
|
|
if (req->scmnd && req->scmnd->device == scmnd->device)
|
|
srp_reset_req(target, req);
|
|
}
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int srp_reset_host(struct scsi_cmnd *scmnd)
|
|
{
|
|
struct srp_target_port *target = host_to_target(scmnd->device->host);
|
|
int ret = FAILED;
|
|
|
|
shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
|
|
|
|
if (!srp_reconnect_target(target))
|
|
ret = SUCCESS;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int srp_slave_configure(struct scsi_device *sdev)
|
|
{
|
|
struct Scsi_Host *shost = sdev->host;
|
|
struct srp_target_port *target = host_to_target(shost);
|
|
struct request_queue *q = sdev->request_queue;
|
|
unsigned long timeout;
|
|
|
|
if (sdev->type == TYPE_DISK) {
|
|
timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
|
|
blk_queue_rq_timeout(q, timeout);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "0x%016llx\n",
|
|
(unsigned long long) be64_to_cpu(target->id_ext));
|
|
}
|
|
|
|
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "0x%016llx\n",
|
|
(unsigned long long) be64_to_cpu(target->ioc_guid));
|
|
}
|
|
|
|
static ssize_t show_service_id(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "0x%016llx\n",
|
|
(unsigned long long) be64_to_cpu(target->service_id));
|
|
}
|
|
|
|
static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
|
|
}
|
|
|
|
static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%pI6\n", target->path.dgid.raw);
|
|
}
|
|
|
|
static ssize_t show_orig_dgid(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%pI6\n", target->orig_dgid);
|
|
}
|
|
|
|
static ssize_t show_req_lim(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%d\n", target->req_lim);
|
|
}
|
|
|
|
static ssize_t show_zero_req_lim(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%d\n", target->zero_req_lim);
|
|
}
|
|
|
|
static ssize_t show_local_ib_port(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%d\n", target->srp_host->port);
|
|
}
|
|
|
|
static ssize_t show_local_ib_device(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
|
|
}
|
|
|
|
static ssize_t show_cmd_sg_entries(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%u\n", target->cmd_sg_cnt);
|
|
}
|
|
|
|
static ssize_t show_allow_ext_sg(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct srp_target_port *target = host_to_target(class_to_shost(dev));
|
|
|
|
return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
|
|
}
|
|
|
|
static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
|
|
static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
|
|
static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
|
|
static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
|
|
static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
|
|
static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
|
|
static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
|
|
static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
|
|
static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
|
|
static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
|
|
static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
|
|
static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
|
|
|
|
static struct device_attribute *srp_host_attrs[] = {
|
|
&dev_attr_id_ext,
|
|
&dev_attr_ioc_guid,
|
|
&dev_attr_service_id,
|
|
&dev_attr_pkey,
|
|
&dev_attr_dgid,
|
|
&dev_attr_orig_dgid,
|
|
&dev_attr_req_lim,
|
|
&dev_attr_zero_req_lim,
|
|
&dev_attr_local_ib_port,
|
|
&dev_attr_local_ib_device,
|
|
&dev_attr_cmd_sg_entries,
|
|
&dev_attr_allow_ext_sg,
|
|
NULL
|
|
};
|
|
|
|
static struct scsi_host_template srp_template = {
|
|
.module = THIS_MODULE,
|
|
.name = "InfiniBand SRP initiator",
|
|
.proc_name = DRV_NAME,
|
|
.slave_configure = srp_slave_configure,
|
|
.info = srp_target_info,
|
|
.queuecommand = srp_queuecommand,
|
|
.eh_abort_handler = srp_abort,
|
|
.eh_device_reset_handler = srp_reset_device,
|
|
.eh_host_reset_handler = srp_reset_host,
|
|
.sg_tablesize = SRP_DEF_SG_TABLESIZE,
|
|
.can_queue = SRP_CMD_SQ_SIZE,
|
|
.this_id = -1,
|
|
.cmd_per_lun = SRP_CMD_SQ_SIZE,
|
|
.use_clustering = ENABLE_CLUSTERING,
|
|
.shost_attrs = srp_host_attrs
|
|
};
|
|
|
|
static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
|
|
{
|
|
struct srp_rport_identifiers ids;
|
|
struct srp_rport *rport;
|
|
|
|
sprintf(target->target_name, "SRP.T10:%016llX",
|
|
(unsigned long long) be64_to_cpu(target->id_ext));
|
|
|
|
if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
|
|
return -ENODEV;
|
|
|
|
memcpy(ids.port_id, &target->id_ext, 8);
|
|
memcpy(ids.port_id + 8, &target->ioc_guid, 8);
|
|
ids.roles = SRP_RPORT_ROLE_TARGET;
|
|
rport = srp_rport_add(target->scsi_host, &ids);
|
|
if (IS_ERR(rport)) {
|
|
scsi_remove_host(target->scsi_host);
|
|
return PTR_ERR(rport);
|
|
}
|
|
|
|
rport->lld_data = target;
|
|
|
|
spin_lock(&host->target_lock);
|
|
list_add_tail(&target->list, &host->target_list);
|
|
spin_unlock(&host->target_lock);
|
|
|
|
target->state = SRP_TARGET_LIVE;
|
|
|
|
scsi_scan_target(&target->scsi_host->shost_gendev,
|
|
0, target->scsi_id, SCAN_WILD_CARD, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void srp_release_dev(struct device *dev)
|
|
{
|
|
struct srp_host *host =
|
|
container_of(dev, struct srp_host, dev);
|
|
|
|
complete(&host->released);
|
|
}
|
|
|
|
static struct class srp_class = {
|
|
.name = "infiniband_srp",
|
|
.dev_release = srp_release_dev
|
|
};
|
|
|
|
/*
|
|
* Target ports are added by writing
|
|
*
|
|
* id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
|
|
* pkey=<P_Key>,service_id=<service ID>
|
|
*
|
|
* to the add_target sysfs attribute.
|
|
*/
|
|
enum {
|
|
SRP_OPT_ERR = 0,
|
|
SRP_OPT_ID_EXT = 1 << 0,
|
|
SRP_OPT_IOC_GUID = 1 << 1,
|
|
SRP_OPT_DGID = 1 << 2,
|
|
SRP_OPT_PKEY = 1 << 3,
|
|
SRP_OPT_SERVICE_ID = 1 << 4,
|
|
SRP_OPT_MAX_SECT = 1 << 5,
|
|
SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
|
|
SRP_OPT_IO_CLASS = 1 << 7,
|
|
SRP_OPT_INITIATOR_EXT = 1 << 8,
|
|
SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
|
|
SRP_OPT_ALLOW_EXT_SG = 1 << 10,
|
|
SRP_OPT_SG_TABLESIZE = 1 << 11,
|
|
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
|
|
SRP_OPT_IOC_GUID |
|
|
SRP_OPT_DGID |
|
|
SRP_OPT_PKEY |
|
|
SRP_OPT_SERVICE_ID),
|
|
};
|
|
|
|
static const match_table_t srp_opt_tokens = {
|
|
{ SRP_OPT_ID_EXT, "id_ext=%s" },
|
|
{ SRP_OPT_IOC_GUID, "ioc_guid=%s" },
|
|
{ SRP_OPT_DGID, "dgid=%s" },
|
|
{ SRP_OPT_PKEY, "pkey=%x" },
|
|
{ SRP_OPT_SERVICE_ID, "service_id=%s" },
|
|
{ SRP_OPT_MAX_SECT, "max_sect=%d" },
|
|
{ SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
|
|
{ SRP_OPT_IO_CLASS, "io_class=%x" },
|
|
{ SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
|
|
{ SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
|
|
{ SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
|
|
{ SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
|
|
{ SRP_OPT_ERR, NULL }
|
|
};
|
|
|
|
static int srp_parse_options(const char *buf, struct srp_target_port *target)
|
|
{
|
|
char *options, *sep_opt;
|
|
char *p;
|
|
char dgid[3];
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int opt_mask = 0;
|
|
int token;
|
|
int ret = -EINVAL;
|
|
int i;
|
|
|
|
options = kstrdup(buf, GFP_KERNEL);
|
|
if (!options)
|
|
return -ENOMEM;
|
|
|
|
sep_opt = options;
|
|
while ((p = strsep(&sep_opt, ",")) != NULL) {
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, srp_opt_tokens, args);
|
|
opt_mask |= token;
|
|
|
|
switch (token) {
|
|
case SRP_OPT_ID_EXT:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
|
|
kfree(p);
|
|
break;
|
|
|
|
case SRP_OPT_IOC_GUID:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
|
|
kfree(p);
|
|
break;
|
|
|
|
case SRP_OPT_DGID:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (strlen(p) != 32) {
|
|
pr_warn("bad dest GID parameter '%s'\n", p);
|
|
kfree(p);
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < 16; ++i) {
|
|
strlcpy(dgid, p + i * 2, 3);
|
|
target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
|
|
}
|
|
kfree(p);
|
|
memcpy(target->orig_dgid, target->path.dgid.raw, 16);
|
|
break;
|
|
|
|
case SRP_OPT_PKEY:
|
|
if (match_hex(args, &token)) {
|
|
pr_warn("bad P_Key parameter '%s'\n", p);
|
|
goto out;
|
|
}
|
|
target->path.pkey = cpu_to_be16(token);
|
|
break;
|
|
|
|
case SRP_OPT_SERVICE_ID:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
|
|
target->path.service_id = target->service_id;
|
|
kfree(p);
|
|
break;
|
|
|
|
case SRP_OPT_MAX_SECT:
|
|
if (match_int(args, &token)) {
|
|
pr_warn("bad max sect parameter '%s'\n", p);
|
|
goto out;
|
|
}
|
|
target->scsi_host->max_sectors = token;
|
|
break;
|
|
|
|
case SRP_OPT_MAX_CMD_PER_LUN:
|
|
if (match_int(args, &token)) {
|
|
pr_warn("bad max cmd_per_lun parameter '%s'\n",
|
|
p);
|
|
goto out;
|
|
}
|
|
target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
|
|
break;
|
|
|
|
case SRP_OPT_IO_CLASS:
|
|
if (match_hex(args, &token)) {
|
|
pr_warn("bad IO class parameter '%s'\n", p);
|
|
goto out;
|
|
}
|
|
if (token != SRP_REV10_IB_IO_CLASS &&
|
|
token != SRP_REV16A_IB_IO_CLASS) {
|
|
pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
|
|
token, SRP_REV10_IB_IO_CLASS,
|
|
SRP_REV16A_IB_IO_CLASS);
|
|
goto out;
|
|
}
|
|
target->io_class = token;
|
|
break;
|
|
|
|
case SRP_OPT_INITIATOR_EXT:
|
|
p = match_strdup(args);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
|
|
kfree(p);
|
|
break;
|
|
|
|
case SRP_OPT_CMD_SG_ENTRIES:
|
|
if (match_int(args, &token) || token < 1 || token > 255) {
|
|
pr_warn("bad max cmd_sg_entries parameter '%s'\n",
|
|
p);
|
|
goto out;
|
|
}
|
|
target->cmd_sg_cnt = token;
|
|
break;
|
|
|
|
case SRP_OPT_ALLOW_EXT_SG:
|
|
if (match_int(args, &token)) {
|
|
pr_warn("bad allow_ext_sg parameter '%s'\n", p);
|
|
goto out;
|
|
}
|
|
target->allow_ext_sg = !!token;
|
|
break;
|
|
|
|
case SRP_OPT_SG_TABLESIZE:
|
|
if (match_int(args, &token) || token < 1 ||
|
|
token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
|
|
pr_warn("bad max sg_tablesize parameter '%s'\n",
|
|
p);
|
|
goto out;
|
|
}
|
|
target->sg_tablesize = token;
|
|
break;
|
|
|
|
default:
|
|
pr_warn("unknown parameter or missing value '%s' in target creation request\n",
|
|
p);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
|
|
ret = 0;
|
|
else
|
|
for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
|
|
if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
|
|
!(srp_opt_tokens[i].token & opt_mask))
|
|
pr_warn("target creation request is missing parameter '%s'\n",
|
|
srp_opt_tokens[i].pattern);
|
|
|
|
out:
|
|
kfree(options);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t srp_create_target(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct srp_host *host =
|
|
container_of(dev, struct srp_host, dev);
|
|
struct Scsi_Host *target_host;
|
|
struct srp_target_port *target;
|
|
struct ib_device *ibdev = host->srp_dev->dev;
|
|
dma_addr_t dma_addr;
|
|
int i, ret;
|
|
|
|
target_host = scsi_host_alloc(&srp_template,
|
|
sizeof (struct srp_target_port));
|
|
if (!target_host)
|
|
return -ENOMEM;
|
|
|
|
target_host->transportt = ib_srp_transport_template;
|
|
target_host->max_channel = 0;
|
|
target_host->max_id = 1;
|
|
target_host->max_lun = SRP_MAX_LUN;
|
|
target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
|
|
|
|
target = host_to_target(target_host);
|
|
|
|
target->io_class = SRP_REV16A_IB_IO_CLASS;
|
|
target->scsi_host = target_host;
|
|
target->srp_host = host;
|
|
target->lkey = host->srp_dev->mr->lkey;
|
|
target->rkey = host->srp_dev->mr->rkey;
|
|
target->cmd_sg_cnt = cmd_sg_entries;
|
|
target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
|
|
target->allow_ext_sg = allow_ext_sg;
|
|
|
|
ret = srp_parse_options(buf, target);
|
|
if (ret)
|
|
goto err;
|
|
|
|
if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
|
|
target->cmd_sg_cnt < target->sg_tablesize) {
|
|
pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
|
|
target->sg_tablesize = target->cmd_sg_cnt;
|
|
}
|
|
|
|
target_host->sg_tablesize = target->sg_tablesize;
|
|
target->indirect_size = target->sg_tablesize *
|
|
sizeof (struct srp_direct_buf);
|
|
target->max_iu_len = sizeof (struct srp_cmd) +
|
|
sizeof (struct srp_indirect_buf) +
|
|
target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
|
|
|
|
INIT_WORK(&target->remove_work, srp_remove_work);
|
|
spin_lock_init(&target->lock);
|
|
INIT_LIST_HEAD(&target->free_tx);
|
|
INIT_LIST_HEAD(&target->free_reqs);
|
|
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
|
|
struct srp_request *req = &target->req_ring[i];
|
|
|
|
req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
|
|
GFP_KERNEL);
|
|
req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
|
|
GFP_KERNEL);
|
|
req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
|
|
if (!req->fmr_list || !req->map_page || !req->indirect_desc)
|
|
goto err_free_mem;
|
|
|
|
dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
|
|
target->indirect_size,
|
|
DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(ibdev, dma_addr))
|
|
goto err_free_mem;
|
|
|
|
req->indirect_dma_addr = dma_addr;
|
|
req->index = i;
|
|
list_add_tail(&req->list, &target->free_reqs);
|
|
}
|
|
|
|
ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
|
|
|
|
shost_printk(KERN_DEBUG, target->scsi_host, PFX
|
|
"new target: id_ext %016llx ioc_guid %016llx pkey %04x "
|
|
"service_id %016llx dgid %pI6\n",
|
|
(unsigned long long) be64_to_cpu(target->id_ext),
|
|
(unsigned long long) be64_to_cpu(target->ioc_guid),
|
|
be16_to_cpu(target->path.pkey),
|
|
(unsigned long long) be64_to_cpu(target->service_id),
|
|
target->path.dgid.raw);
|
|
|
|
ret = srp_create_target_ib(target);
|
|
if (ret)
|
|
goto err_free_mem;
|
|
|
|
ret = srp_new_cm_id(target);
|
|
if (ret)
|
|
goto err_free_ib;
|
|
|
|
ret = srp_connect_target(target);
|
|
if (ret) {
|
|
shost_printk(KERN_ERR, target->scsi_host,
|
|
PFX "Connection failed\n");
|
|
goto err_cm_id;
|
|
}
|
|
|
|
ret = srp_add_target(host, target);
|
|
if (ret)
|
|
goto err_disconnect;
|
|
|
|
return count;
|
|
|
|
err_disconnect:
|
|
srp_disconnect_target(target);
|
|
|
|
err_cm_id:
|
|
ib_destroy_cm_id(target->cm_id);
|
|
|
|
err_free_ib:
|
|
srp_free_target_ib(target);
|
|
|
|
err_free_mem:
|
|
srp_free_req_data(target);
|
|
|
|
err:
|
|
scsi_host_put(target_host);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
|
|
|
|
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct srp_host *host = container_of(dev, struct srp_host, dev);
|
|
|
|
return sprintf(buf, "%s\n", host->srp_dev->dev->name);
|
|
}
|
|
|
|
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
|
|
|
|
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct srp_host *host = container_of(dev, struct srp_host, dev);
|
|
|
|
return sprintf(buf, "%d\n", host->port);
|
|
}
|
|
|
|
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
|
|
|
|
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
|
|
{
|
|
struct srp_host *host;
|
|
|
|
host = kzalloc(sizeof *host, GFP_KERNEL);
|
|
if (!host)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&host->target_list);
|
|
spin_lock_init(&host->target_lock);
|
|
init_completion(&host->released);
|
|
host->srp_dev = device;
|
|
host->port = port;
|
|
|
|
host->dev.class = &srp_class;
|
|
host->dev.parent = device->dev->dma_device;
|
|
dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
|
|
|
|
if (device_register(&host->dev))
|
|
goto free_host;
|
|
if (device_create_file(&host->dev, &dev_attr_add_target))
|
|
goto err_class;
|
|
if (device_create_file(&host->dev, &dev_attr_ibdev))
|
|
goto err_class;
|
|
if (device_create_file(&host->dev, &dev_attr_port))
|
|
goto err_class;
|
|
|
|
return host;
|
|
|
|
err_class:
|
|
device_unregister(&host->dev);
|
|
|
|
free_host:
|
|
kfree(host);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void srp_add_one(struct ib_device *device)
|
|
{
|
|
struct srp_device *srp_dev;
|
|
struct ib_device_attr *dev_attr;
|
|
struct ib_fmr_pool_param fmr_param;
|
|
struct srp_host *host;
|
|
int max_pages_per_fmr, fmr_page_shift, s, e, p;
|
|
|
|
dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
|
|
if (!dev_attr)
|
|
return;
|
|
|
|
if (ib_query_device(device, dev_attr)) {
|
|
pr_warn("Query device failed for %s\n", device->name);
|
|
goto free_attr;
|
|
}
|
|
|
|
srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
|
|
if (!srp_dev)
|
|
goto free_attr;
|
|
|
|
/*
|
|
* Use the smallest page size supported by the HCA, down to a
|
|
* minimum of 4096 bytes. We're unlikely to build large sglists
|
|
* out of smaller entries.
|
|
*/
|
|
fmr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
|
|
srp_dev->fmr_page_size = 1 << fmr_page_shift;
|
|
srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
|
|
srp_dev->fmr_max_size = srp_dev->fmr_page_size * SRP_FMR_SIZE;
|
|
|
|
INIT_LIST_HEAD(&srp_dev->dev_list);
|
|
|
|
srp_dev->dev = device;
|
|
srp_dev->pd = ib_alloc_pd(device);
|
|
if (IS_ERR(srp_dev->pd))
|
|
goto free_dev;
|
|
|
|
srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
|
|
IB_ACCESS_LOCAL_WRITE |
|
|
IB_ACCESS_REMOTE_READ |
|
|
IB_ACCESS_REMOTE_WRITE);
|
|
if (IS_ERR(srp_dev->mr))
|
|
goto err_pd;
|
|
|
|
for (max_pages_per_fmr = SRP_FMR_SIZE;
|
|
max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
|
|
max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
|
|
memset(&fmr_param, 0, sizeof fmr_param);
|
|
fmr_param.pool_size = SRP_FMR_POOL_SIZE;
|
|
fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
|
|
fmr_param.cache = 1;
|
|
fmr_param.max_pages_per_fmr = max_pages_per_fmr;
|
|
fmr_param.page_shift = fmr_page_shift;
|
|
fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
|
|
IB_ACCESS_REMOTE_WRITE |
|
|
IB_ACCESS_REMOTE_READ);
|
|
|
|
srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
|
|
if (!IS_ERR(srp_dev->fmr_pool))
|
|
break;
|
|
}
|
|
|
|
if (IS_ERR(srp_dev->fmr_pool))
|
|
srp_dev->fmr_pool = NULL;
|
|
|
|
if (device->node_type == RDMA_NODE_IB_SWITCH) {
|
|
s = 0;
|
|
e = 0;
|
|
} else {
|
|
s = 1;
|
|
e = device->phys_port_cnt;
|
|
}
|
|
|
|
for (p = s; p <= e; ++p) {
|
|
host = srp_add_port(srp_dev, p);
|
|
if (host)
|
|
list_add_tail(&host->list, &srp_dev->dev_list);
|
|
}
|
|
|
|
ib_set_client_data(device, &srp_client, srp_dev);
|
|
|
|
goto free_attr;
|
|
|
|
err_pd:
|
|
ib_dealloc_pd(srp_dev->pd);
|
|
|
|
free_dev:
|
|
kfree(srp_dev);
|
|
|
|
free_attr:
|
|
kfree(dev_attr);
|
|
}
|
|
|
|
static void srp_remove_one(struct ib_device *device)
|
|
{
|
|
struct srp_device *srp_dev;
|
|
struct srp_host *host, *tmp_host;
|
|
struct srp_target_port *target;
|
|
|
|
srp_dev = ib_get_client_data(device, &srp_client);
|
|
|
|
list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
|
|
device_unregister(&host->dev);
|
|
/*
|
|
* Wait for the sysfs entry to go away, so that no new
|
|
* target ports can be created.
|
|
*/
|
|
wait_for_completion(&host->released);
|
|
|
|
/*
|
|
* Remove all target ports.
|
|
*/
|
|
spin_lock(&host->target_lock);
|
|
list_for_each_entry(target, &host->target_list, list)
|
|
srp_queue_remove_work(target);
|
|
spin_unlock(&host->target_lock);
|
|
|
|
/*
|
|
* Wait for target port removal tasks.
|
|
*/
|
|
flush_workqueue(system_long_wq);
|
|
|
|
kfree(host);
|
|
}
|
|
|
|
if (srp_dev->fmr_pool)
|
|
ib_destroy_fmr_pool(srp_dev->fmr_pool);
|
|
ib_dereg_mr(srp_dev->mr);
|
|
ib_dealloc_pd(srp_dev->pd);
|
|
|
|
kfree(srp_dev);
|
|
}
|
|
|
|
static struct srp_function_template ib_srp_transport_functions = {
|
|
.rport_delete = srp_rport_delete,
|
|
};
|
|
|
|
static int __init srp_init_module(void)
|
|
{
|
|
int ret;
|
|
|
|
BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
|
|
|
|
if (srp_sg_tablesize) {
|
|
pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
|
|
if (!cmd_sg_entries)
|
|
cmd_sg_entries = srp_sg_tablesize;
|
|
}
|
|
|
|
if (!cmd_sg_entries)
|
|
cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
|
|
|
|
if (cmd_sg_entries > 255) {
|
|
pr_warn("Clamping cmd_sg_entries to 255\n");
|
|
cmd_sg_entries = 255;
|
|
}
|
|
|
|
if (!indirect_sg_entries)
|
|
indirect_sg_entries = cmd_sg_entries;
|
|
else if (indirect_sg_entries < cmd_sg_entries) {
|
|
pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
|
|
cmd_sg_entries);
|
|
indirect_sg_entries = cmd_sg_entries;
|
|
}
|
|
|
|
ib_srp_transport_template =
|
|
srp_attach_transport(&ib_srp_transport_functions);
|
|
if (!ib_srp_transport_template)
|
|
return -ENOMEM;
|
|
|
|
ret = class_register(&srp_class);
|
|
if (ret) {
|
|
pr_err("couldn't register class infiniband_srp\n");
|
|
srp_release_transport(ib_srp_transport_template);
|
|
return ret;
|
|
}
|
|
|
|
ib_sa_register_client(&srp_sa_client);
|
|
|
|
ret = ib_register_client(&srp_client);
|
|
if (ret) {
|
|
pr_err("couldn't register IB client\n");
|
|
srp_release_transport(ib_srp_transport_template);
|
|
ib_sa_unregister_client(&srp_sa_client);
|
|
class_unregister(&srp_class);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit srp_cleanup_module(void)
|
|
{
|
|
ib_unregister_client(&srp_client);
|
|
ib_sa_unregister_client(&srp_sa_client);
|
|
class_unregister(&srp_class);
|
|
srp_release_transport(ib_srp_transport_template);
|
|
}
|
|
|
|
module_init(srp_init_module);
|
|
module_exit(srp_cleanup_module);
|