From: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> To: bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Subject: [PATCH] svcrdma: remove rdma_create_qp() failure recovery logic Date: Thu, 31 Jul 2014 15:26:07 -0500 [thread overview] Message-ID: <20140731202606.12144.2363.stgit@build.ogc.int> (raw) In svc_rdma_accept(), if rdma_create_qp() fails, there is useless logic to try and call rdma_create_qp() again with reduced sge depths. The assumption, I guess, was that perhaps the initial sge depths chosen were too big. However they initial depths are selected based on the rdma device attribute max_sge returned from ib_query_device(). If rdma_create_qp() fails, it would not be because the max_send_sge and max_recv_sge values passed in exceed the device's max. So just remove this code. Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> --- net/sunrpc/xprtrdma/svc_rdma_transport.c | 19 ++----------------- 1 files changed, 2 insertions(+), 17 deletions(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index e7323fb..282a43b 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -942,23 +942,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); if (ret) { - /* - * XXX: This is a hack. We need a xx_request_qp interface - * that will adjust the qp_attr's with a best-effort - * number - */ - qp_attr.cap.max_send_sge -= 2; - qp_attr.cap.max_recv_sge -= 2; - ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, - &qp_attr); - if (ret) { - dprintk("svcrdma: failed to create QP, ret=%d\n", ret); - goto errout; - } - newxprt->sc_max_sge = qp_attr.cap.max_send_sge; - newxprt->sc_max_sge = qp_attr.cap.max_recv_sge; - newxprt->sc_sq_depth = qp_attr.cap.max_send_wr; - newxprt->sc_max_requests = qp_attr.cap.max_recv_wr; + dprintk("svcrdma: failed to create QP, ret=%d\n", ret); + goto errout; } newxprt->sc_qp = newxprt->sc_cm_id->qp; -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: Steve Wise <swise@opengridcomputing.com> To: bfields@fieldses.org Cc: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Subject: [PATCH] svcrdma: remove rdma_create_qp() failure recovery logic Date: Thu, 31 Jul 2014 15:26:07 -0500 [thread overview] Message-ID: <20140731202606.12144.2363.stgit@build.ogc.int> (raw) In svc_rdma_accept(), if rdma_create_qp() fails, there is useless logic to try and call rdma_create_qp() again with reduced sge depths. The assumption, I guess, was that perhaps the initial sge depths chosen were too big. However they initial depths are selected based on the rdma device attribute max_sge returned from ib_query_device(). If rdma_create_qp() fails, it would not be because the max_send_sge and max_recv_sge values passed in exceed the device's max. So just remove this code. Signed-off-by: Steve Wise <swise@opengridcomputing.com> --- net/sunrpc/xprtrdma/svc_rdma_transport.c | 19 ++----------------- 1 files changed, 2 insertions(+), 17 deletions(-) diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index e7323fb..282a43b 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -942,23 +942,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); if (ret) { - /* - * XXX: This is a hack. We need a xx_request_qp interface - * that will adjust the qp_attr's with a best-effort - * number - */ - qp_attr.cap.max_send_sge -= 2; - qp_attr.cap.max_recv_sge -= 2; - ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, - &qp_attr); - if (ret) { - dprintk("svcrdma: failed to create QP, ret=%d\n", ret); - goto errout; - } - newxprt->sc_max_sge = qp_attr.cap.max_send_sge; - newxprt->sc_max_sge = qp_attr.cap.max_recv_sge; - newxprt->sc_sq_depth = qp_attr.cap.max_send_wr; - newxprt->sc_max_requests = qp_attr.cap.max_recv_wr; + dprintk("svcrdma: failed to create QP, ret=%d\n", ret); + goto errout; } newxprt->sc_qp = newxprt->sc_cm_id->qp;
next reply other threads:[~2014-07-31 20:26 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-07-31 20:26 Steve Wise [this message] 2014-07-31 20:26 ` [PATCH] svcrdma: remove rdma_create_qp() failure recovery logic Steve Wise [not found] ` <20140731202606.12144.2363.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org> 2014-08-01 14:15 ` Steve Wise 2014-08-01 14:15 ` Steve Wise 2014-08-05 19:10 ` J. Bruce Fields 2014-08-05 19:10 ` J. Bruce Fields
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