[4.2.y-ckt stable] Patch "IB/srp: Fix possible send queue overflow" has been added to staging queue
Kamal Mostafa
kamal at canonical.com
Fri Jan 15 20:12:34 UTC 2016
This is a note to let you know that I have just added a patch titled
IB/srp: Fix possible send queue overflow
to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue
This patch is scheduled to be released in version 4.2.8-ckt2.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Kamal
---8<------------------------------------------------------------
>From 7d2f4c91aeb175e0c7d35ac1180cae4aeb69d9cb Mon Sep 17 00:00:00 2001
From: Sagi Grimberg <sagig at mellanox.com>
Date: Tue, 1 Dec 2015 10:18:03 -0800
Subject: IB/srp: Fix possible send queue overflow
commit 09c0c0bea500a9ad362589990ee316c9b2482f44 upstream.
When using work request based memory registration (fast_reg)
we must reserve SQ entries for registration and invalidation
in addition to send operations. Each IO consumes 3 SQ entries
(registration, send, invalidation) so we need to allocate 3x
larger send-queue instead of 2x.
Signed-off-by: Sagi Grimberg <sagig at mellanox.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Doug Ledford <dledford at redhat.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
drivers/infiniband/ulp/srp/ib_srp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 2216023..bdcb72e 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -496,7 +496,7 @@ static int srp_create_ch_ib(struct srp_rdma_ch *ch)
struct ib_qp *qp;
struct ib_fmr_pool *fmr_pool = NULL;
struct srp_fr_pool *fr_pool = NULL;
- const int m = 1 + dev->use_fast_reg;
+ const int m = dev->use_fast_reg ? 3 : 1;
struct ib_cq_init_attr cq_attr = {};
int ret;
--
1.9.1
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