Makes sure that the SCSI mid-layer never tries to queue more than
(SRP request limit) - 1 SCSI commands. Improves performance for targets whose
request limit is less than or equal to SRP_SQ_REQ_SIZE (63) by reducing the
number of BUSY responses.
Signed-off-by: Bart Van Assche <bart.vanass...@gmail.com>
Cc: Roland Dreier <rola...@cisco.com>
Cc: David Dillow <d...@thedillows.org>
---
drivers/infiniband/ulp/srp/ib_srp.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c
b/drivers/infiniband/ulp/srp/ib_srp.c
index 1c40ac3..4efda6c 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1436,7 +1436,7 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct
ib_cm_event *event)
target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
target->req_lim = be32_to_cpu(rsp->req_lim_delta);
- target->scsi_host->can_queue = min(target->req_lim,
+ target->scsi_host->can_queue = min(target->req_lim - 1,
target->scsi_host->can_queue);
} else {
shost_printk(KERN_WARNING, target->scsi_host,
--
1.6.4.2
--
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