![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>
213 lines
5.1 KiB
C
213 lines
5.1 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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#ifndef IB_SRP_H
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#define IB_SRP_H
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/scatterlist.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_cmnd.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_sa.h>
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#include <rdma/ib_cm.h>
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#include <rdma/ib_fmr_pool.h>
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enum {
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SRP_PATH_REC_TIMEOUT_MS = 1000,
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SRP_ABORT_TIMEOUT_MS = 5000,
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SRP_PORT_REDIRECT = 1,
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SRP_DLID_REDIRECT = 2,
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SRP_STALE_CONN = 3,
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SRP_MAX_LUN = 512,
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SRP_DEF_SG_TABLESIZE = 12,
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SRP_RQ_SHIFT = 6,
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SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
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SRP_SQ_SIZE = SRP_RQ_SIZE,
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SRP_RSP_SQ_SIZE = 1,
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SRP_REQ_SQ_SIZE = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
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SRP_TSK_MGMT_SQ_SIZE = 1,
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SRP_CMD_SQ_SIZE = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
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SRP_TAG_NO_REQ = ~0U,
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SRP_TAG_TSK_MGMT = 1U << 31,
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SRP_FMR_SIZE = 512,
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SRP_FMR_MIN_SIZE = 128,
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SRP_FMR_POOL_SIZE = 1024,
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SRP_FMR_DIRTY_SIZE = SRP_FMR_POOL_SIZE / 4,
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SRP_MAP_ALLOW_FMR = 0,
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SRP_MAP_NO_FMR = 1,
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};
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enum srp_target_state {
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SRP_TARGET_LIVE,
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SRP_TARGET_REMOVED,
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};
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enum srp_iu_type {
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SRP_IU_CMD,
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SRP_IU_TSK_MGMT,
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SRP_IU_RSP,
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};
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struct srp_device {
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struct list_head dev_list;
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struct ib_device *dev;
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struct ib_pd *pd;
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struct ib_mr *mr;
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struct ib_fmr_pool *fmr_pool;
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u64 fmr_page_mask;
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int fmr_page_size;
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int fmr_max_size;
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};
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struct srp_host {
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struct srp_device *srp_dev;
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u8 port;
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struct device dev;
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struct list_head target_list;
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spinlock_t target_lock;
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struct completion released;
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struct list_head list;
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};
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struct srp_request {
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struct list_head list;
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struct scsi_cmnd *scmnd;
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struct srp_iu *cmd;
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struct ib_pool_fmr **fmr_list;
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u64 *map_page;
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struct srp_direct_buf *indirect_desc;
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dma_addr_t indirect_dma_addr;
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short nfmr;
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short index;
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};
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struct srp_target_port {
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/* These are RW in the hot path, and commonly used together */
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struct list_head free_tx;
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struct list_head free_reqs;
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spinlock_t lock;
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s32 req_lim;
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/* These are read-only in the hot path */
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struct ib_cq *send_cq ____cacheline_aligned_in_smp;
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struct ib_cq *recv_cq;
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struct ib_qp *qp;
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u32 lkey;
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u32 rkey;
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enum srp_target_state state;
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unsigned int max_iu_len;
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unsigned int cmd_sg_cnt;
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unsigned int indirect_size;
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bool allow_ext_sg;
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bool transport_offline;
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/* Everything above this point is used in the hot path of
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* command processing. Try to keep them packed into cachelines.
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*/
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__be64 id_ext;
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__be64 ioc_guid;
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__be64 service_id;
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__be64 initiator_ext;
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u16 io_class;
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struct srp_host *srp_host;
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struct Scsi_Host *scsi_host;
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char target_name[32];
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unsigned int scsi_id;
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unsigned int sg_tablesize;
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struct ib_sa_path_rec path;
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__be16 orig_dgid[8];
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struct ib_sa_query *path_query;
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int path_query_id;
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u32 rq_tmo_jiffies;
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bool connected;
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struct ib_cm_id *cm_id;
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int max_ti_iu_len;
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int zero_req_lim;
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struct srp_iu *tx_ring[SRP_SQ_SIZE];
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struct srp_iu *rx_ring[SRP_RQ_SIZE];
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struct srp_request req_ring[SRP_CMD_SQ_SIZE];
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struct work_struct remove_work;
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struct list_head list;
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struct completion done;
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int status;
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bool qp_in_error;
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struct completion tsk_mgmt_done;
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u8 tsk_mgmt_status;
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};
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struct srp_iu {
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struct list_head list;
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u64 dma;
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void *buf;
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size_t size;
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enum dma_data_direction direction;
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};
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struct srp_map_state {
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struct ib_pool_fmr **next_fmr;
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struct srp_direct_buf *desc;
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u64 *pages;
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dma_addr_t base_dma_addr;
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u32 fmr_len;
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u32 total_len;
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unsigned int npages;
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unsigned int nfmr;
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unsigned int ndesc;
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struct scatterlist *unmapped_sg;
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int unmapped_index;
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dma_addr_t unmapped_addr;
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};
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#endif /* IB_SRP_H */
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