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IB/srp: Use block layer tags 

Since the block layer already contains functionality to assign
a tag to each request, use that functionality instead of
reimplementing that functionality in the SRP initiator driver.
This change makes the free_reqs list superfluous. Hence remove
that list.

[hch: updated to use .use_blk_tags instead scsi_activate_tcq]
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Bart Van Assche 2014-10-02 15:29:25 +02:00 committed by Christoph Hellwig
parent 509c07bc18
commit 77f2c1a40e
2 changed files with 27 additions and 24 deletions
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48
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -821,8 +821,6 @@ static int srp_alloc_req_data(struct srp_rdma_ch *ch)
dma_addr_t dma_addr;
int i, ret = -ENOMEM;
INIT_LIST_HEAD(&ch->free_reqs);
ch->req_ring = kcalloc(target->req_ring_size, sizeof(*ch->req_ring),
GFP_KERNEL);
if (!ch->req_ring)
@ -853,8 +851,6 @@ static int srp_alloc_req_data(struct srp_rdma_ch *ch)
goto out;
req->indirect_dma_addr = dma_addr;
req->index = i;
list_add_tail(&req->list, &ch->free_reqs);
}
ret = 0;
@ -1076,7 +1072,6 @@ static void srp_free_req(struct srp_rdma_ch *ch, struct srp_request *req,
spin_lock_irqsave(&ch->lock, flags);
ch->req_lim += req_lim_delta;
list_add_tail(&req->list, &ch->free_reqs);
spin_unlock_irqrestore(&ch->lock, flags);
}
@ -1648,8 +1643,11 @@ static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
ch->tsk_mgmt_status = rsp->data[3];
complete(&ch->tsk_mgmt_done);
} else {
req = &ch->req_ring[rsp->tag];
scmnd = srp_claim_req(ch, req, NULL, NULL);
scmnd = scsi_host_find_tag(target->scsi_host, rsp->tag);
if (scmnd) {
req = (void *)scmnd->host_scribble;
scmnd = srp_claim_req(ch, req, NULL, scmnd);
}
if (!scmnd) {
shost_printk(KERN_ERR, target->scsi_host,
"Null scmnd for RSP w/tag %016llx\n",
@ -1889,6 +1887,8 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
struct srp_cmd *cmd;
struct ib_device *dev;
unsigned long flags;
u32 tag;
u16 idx;
int len, ret;
const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
@ -1905,17 +1905,22 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
if (unlikely(scmnd->result))
goto err;
WARN_ON_ONCE(scmnd->request->tag < 0);
tag = blk_mq_unique_tag(scmnd->request);
ch = &target->ch;
idx = blk_mq_unique_tag_to_tag(tag);
WARN_ONCE(idx >= target->req_ring_size, "%s: tag %#x: idx %d >= %d\n",
dev_name(&shost->shost_gendev), tag, idx,
target->req_ring_size);
spin_lock_irqsave(&ch->lock, flags);
iu = __srp_get_tx_iu(ch, SRP_IU_CMD);
if (!iu)
goto err_unlock;
req = list_first_entry(&ch->free_reqs, struct srp_request, list);
list_del(&req->list);
spin_unlock_irqrestore(&ch->lock, flags);
if (!iu)
goto err;
req = &ch->req_ring[idx];
dev = target->srp_host->srp_dev->dev;
ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
DMA_TO_DEVICE);
@ -1927,7 +1932,7 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
cmd->opcode = SRP_CMD;
cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
cmd->tag = req->index;
cmd->tag = tag;
memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
req->scmnd = scmnd;
@ -1976,12 +1981,6 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
*/
req->scmnd = NULL;
spin_lock_irqsave(&ch->lock, flags);
list_add(&req->list, &ch->free_reqs);
err_unlock:
spin_unlock_irqrestore(&ch->lock, flags);
err:
if (scmnd->result) {
scmnd->scsi_done(scmnd);
@ -2387,6 +2386,7 @@ 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;
u32 tag;
struct srp_rdma_ch *ch;
int ret;
@ -2395,7 +2395,8 @@ static int srp_abort(struct scsi_cmnd *scmnd)
ch = &target->ch;
if (!req || !srp_claim_req(ch, req, NULL, scmnd))
return SUCCESS;
if (srp_send_tsk_mgmt(ch, req->index, scmnd->device->lun,
tag = blk_mq_unique_tag(scmnd->request);
if (srp_send_tsk_mgmt(ch, tag, scmnd->device->lun,
SRP_TSK_ABORT_TASK) == 0)
ret = SUCCESS;
else if (target->rport->state == SRP_RPORT_LOST)
@ -2633,7 +2634,8 @@ static struct scsi_host_template srp_template = {
.this_id = -1,
.cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = srp_host_attrs
.shost_attrs = srp_host_attrs,
.use_blk_tags = 1,
};
static int srp_sdev_count(struct Scsi_Host *host)
@ -3054,6 +3056,10 @@ static ssize_t srp_create_target(struct device *dev,
if (ret)
goto err;
ret = scsi_init_shared_tag_map(target_host, target_host->can_queue);
if (ret)
goto err;
target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
if (!srp_conn_unique(target->srp_host, target)) {

3
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -116,7 +116,6 @@ struct srp_host {
};
struct srp_request {
struct list_head list;
struct scsi_cmnd *scmnd;
struct srp_iu *cmd;
union {
@ -127,7 +126,6 @@ struct srp_request {
struct srp_direct_buf *indirect_desc;
dma_addr_t indirect_dma_addr;
short nmdesc;
short index;
};
/**
@ -137,7 +135,6 @@ struct srp_request {
struct srp_rdma_ch {
/* These are RW in the hot path, and commonly used together */
struct list_head free_tx;
struct list_head free_reqs;
spinlock_t lock;
s32 req_lim;