> James,
>   I’m pretty sure this port to upstream is flawed.  See below

Yep. I missed that line. Thanks for review. Greg you can drop this one. I 
will submit a updated version soon. This patch series is not 
order dependent so the other patches are safe to land.
 
> On 5/9/16, 7:53 AM, "lustre-devel on behalf of James Simmons" 
> <lustre-devel-boun...@lists.lustre.org on behalf of jsimm...@infradead.org> 
> wrote:
> 
>>From: Dmitry Eremin <dmitry.ere...@intel.com>
>>
>>Decrease cap.max_send_wr until it is accepted by rdma_create_qp()
>>
>>Signed-off-by: Dmitry Eremin <dmitry.ere...@intel.com>
>>Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7124
>>Reviewed-on: http://review.whamcloud.com/18347
>>Reviewed-by: Olaf Weber <o...@sgi.com>
>>Reviewed-by: Doug Oucharek <doug.s.oucha...@intel.com>
>>Reviewed-by: Oleg Drokin <oleg.dro...@intel.com>
>>Signed-off-by: James Simmons <jsimm...@infradead.org>
>>---
>> .../staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c    |   11 ++++++++++-
>> 1 files changed, 10 insertions(+), 1 deletions(-)
>>
>>diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c 
>>b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
>>index d99b4fa..bc179a2 100644
>>--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
>>+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
>>@@ -768,7 +768,12 @@ kib_conn_t *kiblnd_create_conn(kib_peer_t *peer, struct 
>>rdma_cm_id *cmid,
>> 
>>      conn->ibc_sched = sched;
>> 
>> -    rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
>> +    do {
>> +            rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
>> +            if (!rc || init_qp_attr->cap.max_send_wr < 16)
>> +                    break;
> 
> I think the loop here is missing code to decrease the max_send_wr value.  In 
> current master it’s
> 
>               init_qp_attr->cap.max_send_wr -= init_qp_attr->cap.max_send_wr 
> / 4;
> 
>>+     } while (rc);
>>+
>>      if (rc) {
>>              CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d\n",
>>                     rc, init_qp_attr->cap.max_send_wr,
>>@@ -776,6 +781,10 @@ kib_conn_t *kiblnd_create_conn(kib_peer_t *peer, struct 
>>rdma_cm_id *cmid,
>>              goto failed_2;
>>      }
>> 
>>+     if (init_qp_attr->cap.max_send_wr != IBLND_SEND_WRS(conn))
>>+             CDEBUG(D_NET, "original send wr %d, created with %d\n",
>>+                    IBLND_SEND_WRS(conn), init_qp_attr->cap.max_send_wr);
>>+
>>      LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
>> 
>>      /* 1 ref for caller and each rxmsg */
>> -- 
>> 1.7.1
>> 
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