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authorBart Van Assche <bvanassche@acm.org>2014-10-19 18:05:33 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-12-06 15:05:49 -0800
commit4b5ba6a22b7a4afe1f3e57d8f462c80c77cb8599 (patch)
treef0e13f28a7ffd41edd46e3c4b4342c862d57a55f /drivers/infiniband
parentee57215c5a86a829b257f09e58f510696e9e022c (diff)
downloadlinux-linaro-stable-4b5ba6a22b7a4afe1f3e57d8f462c80c77cb8599.tar.gz
srp-target: Retry when QP creation fails with ENOMEM
commit ab477c1ff5e0a744c072404bf7db51bfe1f05b6e upstream. It is not guaranteed to that srp_sq_size is supported by the HCA. So if we failed to create the QP with ENOMEM, try with a smaller srp_sq_size. Keep it up until we hit MIN_SRPT_SQ_SIZE, then fail the connection. Reported-by: Mark Lehrer <lehrer@gmail.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/ulp/srpt/ib_srpt.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 64953dfa9d8a..fcf9f87bcfd9 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -2101,6 +2101,7 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
if (!qp_init)
goto out;
+retry:
ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
ch->rq_size + srp_sq_size, 0);
if (IS_ERR(ch->cq)) {
@@ -2124,6 +2125,13 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
ch->qp = ib_create_qp(sdev->pd, qp_init);
if (IS_ERR(ch->qp)) {
ret = PTR_ERR(ch->qp);
+ if (ret == -ENOMEM) {
+ srp_sq_size /= 2;
+ if (srp_sq_size >= MIN_SRPT_SQ_SIZE) {
+ ib_destroy_cq(ch->cq);
+ goto retry;
+ }
+ }
printk(KERN_ERR "failed to create_qp ret= %d\n", ret);
goto err_destroy_cq;
}