Certain storage configurations, e.g. a sufficiently large array of
hard disks in a RAID configuration, need a queue depth above 64 to
achieve optimal performance. Hence make the queue depth configurable.
Signed-off-by: Bart Van Assche <bvanass...@acm.org>
Cc: Roland Dreier <rol...@purestorage.com>
Cc: David Dillow <dillo...@ornl.gov>
Cc: Vu Pham <v...@mellanox.com>
Cc: Sebastian Riemer <sebastian.rie...@profitbricks.com>
Cc: Konrad Grzybowski <konr...@k2.pl>
---
drivers/infiniband/ulp/srp/ib_srp.c | 125 ++++++++++++++++++++++++++---------
drivers/infiniband/ulp/srp/ib_srp.h | 17 +++--
2 files changed, 103 insertions(+), 39 deletions(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c
b/drivers/infiniband/ulp/srp/ib_srp.c
index ece1f2d..6de2323 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -299,16 +299,16 @@ static int srp_create_target_ib(struct srp_target_port
*target)
return -ENOMEM;
recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
- srp_recv_completion, NULL, target, SRP_RQ_SIZE,
- target->comp_vector);
+ srp_recv_completion, NULL, target,
+ target->queue_size, target->comp_vector);
if (IS_ERR(recv_cq)) {
ret = PTR_ERR(recv_cq);
goto err;
}
send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
- srp_send_completion, NULL, target, SRP_SQ_SIZE,
- target->comp_vector);
+ srp_send_completion, NULL, target,
+ target->queue_size, target->comp_vector);
if (IS_ERR(send_cq)) {
ret = PTR_ERR(send_cq);
goto err_recv_cq;
@@ -317,8 +317,8 @@ static int srp_create_target_ib(struct srp_target_port
*target)
ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
init_attr->event_handler = srp_qp_event;
- init_attr->cap.max_send_wr = SRP_SQ_SIZE;
- init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
+ init_attr->cap.max_send_wr = target->queue_size;
+ init_attr->cap.max_recv_wr = target->queue_size;
init_attr->cap.max_recv_sge = 1;
init_attr->cap.max_send_sge = 1;
init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
@@ -364,6 +364,10 @@ err:
return ret;
}
+/*
+ * Note: this function may be called without srp_alloc_iu_bufs() having been
+ * invoked. Hence the target->[rt]x_ring checks.
+ */
static void srp_free_target_ib(struct srp_target_port *target)
{
int i;
@@ -375,10 +379,18 @@ static void srp_free_target_ib(struct srp_target_port
*target)
target->qp = NULL;
target->send_cq = target->recv_cq = NULL;
- for (i = 0; i < SRP_RQ_SIZE; ++i)
- srp_free_iu(target->srp_host, target->rx_ring[i]);
- for (i = 0; i < SRP_SQ_SIZE; ++i)
- srp_free_iu(target->srp_host, target->tx_ring[i]);
+ if (target->rx_ring) {
+ for (i = 0; i < target->queue_size; ++i)
+ srp_free_iu(target->srp_host, target->rx_ring[i]);
+ kfree(target->rx_ring);
+ target->rx_ring = NULL;
+ }
+ if (target->tx_ring) {
+ for (i = 0; i < target->queue_size; ++i)
+ srp_free_iu(target->srp_host, target->tx_ring[i]);
+ kfree(target->tx_ring);
+ target->tx_ring = NULL;
+ }
}
static void srp_path_rec_completion(int status,
@@ -564,7 +576,11 @@ static void srp_free_req_data(struct srp_target_port
*target)
struct srp_request *req;
int i;
- for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
+ if (!target->req_ring)
+ return;
+
+ for (i = 0; i < target->req_ring_size; ++i) {
+ req = &target->req_ring[i];
kfree(req->fmr_list);
kfree(req->map_page);
if (req->indirect_dma_addr) {
@@ -574,6 +590,9 @@ static void srp_free_req_data(struct srp_target_port
*target)
}
kfree(req->indirect_desc);
}
+
+ kfree(target->req_ring);
+ target->req_ring = NULL;
}
static int srp_alloc_req_data(struct srp_target_port *target)
@@ -586,7 +605,12 @@ static int srp_alloc_req_data(struct srp_target_port
*target)
INIT_LIST_HEAD(&target->free_reqs);
- for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
+ target->req_ring = kzalloc(target->req_ring_size *
+ sizeof(*target->req_ring), GFP_KERNEL);
+ if (!target->req_ring)
+ goto out;
+
+ for (i = 0; i < target->req_ring_size; ++i) {
req = &target->req_ring[i];
req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
GFP_KERNEL);
@@ -810,7 +834,7 @@ static void srp_terminate_io(struct srp_rport *rport)
struct srp_target_port *target = rport->lld_data;
int i;
- for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
+ for (i = 0; i < target->req_ring_size; ++i) {
struct srp_request *req = &target->req_ring[i];
srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16);
}
@@ -847,13 +871,13 @@ static int srp_rport_reconnect(struct srp_rport *rport)
else
srp_create_target_ib(target);
- for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
+ for (i = 0; i < target->req_ring_size; ++i) {
struct srp_request *req = &target->req_ring[i];
srp_finish_req(target, req, DID_RESET << 16);
}
INIT_LIST_HEAD(&target->free_tx);
- for (i = 0; i < SRP_SQ_SIZE; ++i)
+ for (i = 0; i < target->queue_size; ++i)
list_add(&target->tx_ring[i]->list, &target->free_tx);
if (ret == 0)
@@ -1544,11 +1568,24 @@ err_unlock:
return SCSI_MLQUEUE_HOST_BUSY;
}
+/*
+ * Note: the resources allocated in this function are freed in
+ * srp_free_target_ib().
+ */
static int srp_alloc_iu_bufs(struct srp_target_port *target)
{
int i;
- for (i = 0; i < SRP_RQ_SIZE; ++i) {
+ target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
+ GFP_KERNEL);
+ if (!target->rx_ring)
+ goto err_no_ring;
+ target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
+ GFP_KERNEL);
+ if (!target->tx_ring)
+ goto err_no_ring;
+
+ for (i = 0; i < target->queue_size; ++i) {
target->rx_ring[i] = srp_alloc_iu(target->srp_host,
target->max_ti_iu_len,
GFP_KERNEL, DMA_FROM_DEVICE);
@@ -1556,7 +1593,7 @@ static int srp_alloc_iu_bufs(struct srp_target_port
*target)
goto err;
}
- for (i = 0; i < SRP_SQ_SIZE; ++i) {
+ for (i = 0; i < target->queue_size; ++i) {
target->tx_ring[i] = srp_alloc_iu(target->srp_host,
target->max_iu_len,
GFP_KERNEL, DMA_TO_DEVICE);
@@ -1569,16 +1606,18 @@ static int srp_alloc_iu_bufs(struct srp_target_port
*target)
return 0;
err:
- for (i = 0; i < SRP_RQ_SIZE; ++i) {
+ for (i = 0; i < target->queue_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;
}
+
+err_no_ring:
+ kfree(target->tx_ring);
+ target->tx_ring = NULL;
+ kfree(target->rx_ring);
+ target->rx_ring = NULL;
+
return -ENOMEM;
}
@@ -1629,6 +1668,9 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
target->scsi_host->can_queue
= min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
target->scsi_host->can_queue);
+ target->scsi_host->cmd_per_lun
+ = min_t(int, target->scsi_host->can_queue,
+ target->scsi_host->cmd_per_lun);
} else {
shost_printk(KERN_WARNING, target->scsi_host,
PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
@@ -1636,7 +1678,7 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
goto error;
}
- if (!target->rx_ring[0]) {
+ if (!target->rx_ring) {
ret = srp_alloc_iu_bufs(target);
if (ret)
goto error;
@@ -1656,7 +1698,7 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
if (ret)
goto error_free;
- for (i = 0; i < SRP_RQ_SIZE; i++) {
+ for (i = 0; i < target->queue_size; i++) {
struct srp_iu *iu = target->rx_ring[i];
ret = srp_post_recv(target, iu);
if (ret)
@@ -1903,7 +1945,7 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
if (target->tsk_mgmt_status)
return FAILED;
- for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
+ for (i = 0; i < target->req_ring_size; ++i) {
struct srp_request *req = &target->req_ring[i];
if (req->scmnd && req->scmnd->device == scmnd->device)
srp_finish_req(target, req, DID_RESET << 16);
@@ -2096,9 +2138,9 @@ static struct scsi_host_template srp_template = {
.eh_host_reset_handler = srp_reset_host,
.skip_settle_delay = true,
.sg_tablesize = SRP_DEF_SG_TABLESIZE,
- .can_queue = SRP_CMD_SQ_SIZE,
+ .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
.this_id = -1,
- .cmd_per_lun = SRP_CMD_SQ_SIZE,
+ .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = srp_host_attrs
};
@@ -2205,6 +2247,7 @@ enum {
SRP_OPT_SG_TABLESIZE = 1 << 11,
SRP_OPT_COMP_VECTOR = 1 << 12,
SRP_OPT_TL_RETRY_COUNT = 1 << 13,
+ SRP_OPT_CAN_QUEUE = 1 << 14,
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
SRP_OPT_IOC_GUID |
SRP_OPT_DGID |
@@ -2227,6 +2270,7 @@ static const match_table_t srp_opt_tokens = {
{ SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
{ SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
{ SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
+ { SRP_OPT_CAN_QUEUE, "can_queue=%d" },
{ SRP_OPT_ERR, NULL }
};
@@ -2321,13 +2365,25 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
target->scsi_host->max_sectors = token;
break;
+ case SRP_OPT_CAN_QUEUE:
+ if (match_int(args, &token) || token < 1) {
+ pr_warn("bad can_queue parameter '%s'\n", p);
+ goto out;
+ }
+ target->scsi_host->can_queue = token;
+ target->queue_size = token + SRP_RSP_SQ_SIZE +
+ SRP_TSK_MGMT_SQ_SIZE;
+ if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
+ target->scsi_host->cmd_per_lun = token;
+ break;
+
case SRP_OPT_MAX_CMD_PER_LUN:
- if (match_int(args, &token)) {
+ if (match_int(args, &token) || token < 1) {
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);
+ target->scsi_host->cmd_per_lun = token;
break;
case SRP_OPT_IO_CLASS:
@@ -2415,6 +2471,12 @@ static int srp_parse_options(const char *buf, struct
srp_target_port *target)
pr_warn("target creation request is missing
parameter '%s'\n",
srp_opt_tokens[i].pattern);
+ if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
+ && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
+ pr_warn("cmd_per_lun = %d > can_queue = %d\n",
+ target->scsi_host->cmd_per_lun,
+ target->scsi_host->can_queue);
+
out:
kfree(options);
return ret;
@@ -2453,11 +2515,14 @@ static ssize_t srp_create_target(struct device *dev,
target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
target->allow_ext_sg = allow_ext_sg;
target->tl_retry_count = 7;
+ target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
ret = srp_parse_options(buf, target);
if (ret)
goto err;
+ target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
+
if (!srp_conn_unique(target->srp_host, target)) {
shost_printk(KERN_INFO, target->scsi_host,
PFX "Already connected to target port with
id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h
b/drivers/infiniband/ulp/srp/ib_srp.h
index 446b045..5756810 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.h
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -57,14 +57,11 @@ enum {
SRP_MAX_LUN = 512,
SRP_DEF_SG_TABLESIZE = 12,
- SRP_RQ_SHIFT = 6,
- SRP_RQ_SIZE = 1 << SRP_RQ_SHIFT,
-
- SRP_SQ_SIZE = SRP_RQ_SIZE,
+ SRP_DEFAULT_QUEUE_SIZE = 1 << 6,
SRP_RSP_SQ_SIZE = 1,
- SRP_REQ_SQ_SIZE = SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
SRP_TSK_MGMT_SQ_SIZE = 1,
- SRP_CMD_SQ_SIZE = SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,
+ SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE -
+ SRP_TSK_MGMT_SQ_SIZE,
SRP_TAG_NO_REQ = ~0U,
SRP_TAG_TSK_MGMT = 1U << 31,
@@ -156,6 +153,8 @@ struct srp_target_port {
char target_name[32];
unsigned int scsi_id;
unsigned int sg_tablesize;
+ int queue_size;
+ int req_ring_size;
int comp_vector;
int tl_retry_count;
@@ -173,9 +172,9 @@ struct srp_target_port {
int zero_req_lim;
- struct srp_iu *tx_ring[SRP_SQ_SIZE];
- struct srp_iu *rx_ring[SRP_RQ_SIZE];
- struct srp_request req_ring[SRP_CMD_SQ_SIZE];
+ struct srp_iu **tx_ring;
+ struct srp_iu **rx_ring;
+ struct srp_request *req_ring;
struct work_struct tl_err_work;
struct work_struct remove_work;
