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-rw-r--r--drivers/infiniband/ulp/srp/ib_srp.c124
-rw-r--r--drivers/infiniband/ulp/srp/ib_srp.h1
2 files changed, 67 insertions, 58 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 2aff8814f2c5..e5bd181dbce5 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -818,9 +818,24 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
}
/*
+ * 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->scsi_host->host_lock, flags);
+ list_add(&iu->list, &target->free_tx);
+ if (iu_type != SRP_IU_RSP)
+ ++target->req_lim;
+ spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
+}
+
+/*
* Must be called with target->scsi_host->host_lock held to protect
- * req_lim and free_tx. Lock cannot be dropped between call here and
- * call to __srp_post_send().
+ * 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
@@ -843,26 +858,25 @@ static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
return NULL;
/* Initiator responses to target requests do not consume credits */
- if (target->req_lim <= rsv && iu_type != SRP_IU_RSP) {
- ++target->zero_req_lim;
- return NULL;
+ 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);
- iu->type = iu_type;
+ list_del(&iu->list);
return iu;
}
-/*
- * Must be called with target->scsi_host->host_lock held to protect
- * req_lim and free_tx.
- */
-static int __srp_post_send(struct srp_target_port *target,
- struct srp_iu *iu, int len)
+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;
- int ret = 0;
list.addr = iu->dma;
list.length = len;
@@ -875,15 +889,7 @@ static int __srp_post_send(struct srp_target_port *target,
wr.opcode = IB_WR_SEND;
wr.send_flags = IB_SEND_SIGNALED;
- ret = ib_post_send(target->qp, &wr, &bad_wr);
-
- if (!ret) {
- list_del(&iu->list);
- if (iu->type != SRP_IU_RSP)
- --target->req_lim;
- }
-
- return ret;
+ return ib_post_send(target->qp, &wr, &bad_wr);
}
static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
@@ -953,34 +959,33 @@ static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
static int srp_response_common(struct srp_target_port *target, s32 req_delta,
void *rsp, int len)
{
- struct ib_device *dev;
+ struct ib_device *dev = target->srp_host->srp_dev->dev;
unsigned long flags;
struct srp_iu *iu;
- int err = 1;
-
- dev = target->srp_host->srp_dev->dev;
+ int err;
spin_lock_irqsave(target->scsi_host->host_lock, flags);
target->req_lim += req_delta;
-
iu = __srp_get_tx_iu(target, SRP_IU_RSP);
+ spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
+
if (!iu) {
shost_printk(KERN_ERR, target->scsi_host, PFX
"no IU available to send response\n");
- goto out;
+ 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)
+ 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);
+ }
-out:
- spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
return err;
}
@@ -1107,14 +1112,14 @@ static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
}
}
-static int srp_queuecommand_lck(struct scsi_cmnd *scmnd,
- void (*done)(struct scsi_cmnd *))
+static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
{
- struct srp_target_port *target = host_to_target(scmnd->device->host);
+ 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 (target->state == SRP_TARGET_CONNECTING)
@@ -1123,11 +1128,19 @@ static int srp_queuecommand_lck(struct scsi_cmnd *scmnd,
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED) {
scmnd->result = DID_BAD_TARGET << 16;
- done(scmnd);
+ scmnd->scsi_done(scmnd);
return 0;
}
+ spin_lock_irqsave(shost->host_lock, flags);
iu = __srp_get_tx_iu(target, SRP_IU_CMD);
+ if (iu) {
+ req = list_first_entry(&target->free_reqs, struct srp_request,
+ list);
+ list_del(&req->list);
+ }
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
if (!iu)
goto err;
@@ -1135,9 +1148,6 @@ static int srp_queuecommand_lck(struct scsi_cmnd *scmnd,
ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
DMA_TO_DEVICE);
- req = list_first_entry(&target->free_reqs, struct srp_request, list);
-
- scmnd->scsi_done = done;
scmnd->result = 0;
scmnd->host_scribble = (void *) req;
@@ -1156,30 +1166,33 @@ static int srp_queuecommand_lck(struct scsi_cmnd *scmnd,
if (len < 0) {
shost_printk(KERN_ERR, target->scsi_host,
PFX "Failed to map data\n");
- goto err;
+ goto err_iu;
}
ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
DMA_TO_DEVICE);
- if (__srp_post_send(target, iu, len)) {
+ if (srp_post_send(target, iu, len)) {
shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
goto err_unmap;
}
- list_del(&req->list);
-
return 0;
err_unmap:
srp_unmap_data(scmnd, target, req);
+err_iu:
+ srp_put_tx_iu(target, iu, SRP_IU_CMD);
+
+ spin_lock_irqsave(shost->host_lock, flags);
+ list_add(&req->list, &target->free_reqs);
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
err:
return SCSI_MLQUEUE_HOST_BUSY;
}
-static DEF_SCSI_QCMD(srp_queuecommand)
-
static int srp_alloc_iu_bufs(struct srp_target_port *target)
{
int i;
@@ -1433,17 +1446,18 @@ static int srp_send_tsk_mgmt(struct srp_target_port *target,
struct srp_iu *iu;
struct srp_tsk_mgmt *tsk_mgmt;
- spin_lock_irq(target->scsi_host->host_lock);
-
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
- goto out;
+ return -1;
init_completion(&target->tsk_mgmt_done);
+ spin_lock_irq(target->scsi_host->host_lock);
iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
+ spin_unlock_irq(target->scsi_host->host_lock);
+
if (!iu)
- goto out;
+ return -1;
ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
DMA_TO_DEVICE);
@@ -1458,20 +1472,16 @@ static int srp_send_tsk_mgmt(struct srp_target_port *target,
ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
DMA_TO_DEVICE);
- if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
- goto out;
-
- spin_unlock_irq(target->scsi_host->host_lock);
+ 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;
-
-out:
- spin_unlock_irq(target->scsi_host->host_lock);
- return -1;
}
static int srp_abort(struct scsi_cmnd *scmnd)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
index 924d8e9c6672..81686eee7e62 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.h
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -168,7 +168,6 @@ struct srp_iu {
void *buf;
size_t size;
enum dma_data_direction direction;
- enum srp_iu_type type;
};
#endif /* IB_SRP_H */
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