Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757522AbbDXM3A (ORCPT ); Fri, 24 Apr 2015 08:29:00 -0400 Received: from mail-wi0-f175.google.com ([209.85.212.175]:34938 "EHLO mail-wi0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754539AbbDXMYj (ORCPT ); Fri, 24 Apr 2015 08:24:39 -0400 From: Michael Wang To: Roland Dreier , Sean Hefty , Hal Rosenstock , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Michael Wang , Steve Wise , Tom Talpey , Jason Gunthorpe , Doug Ledford , Ira Weiny , Tom Tucker , Hoang-Nam Nguyen , Christoph Raisch , Mike Marciniszyn , Eli Cohen , Faisal Latif , Jack Morgenstein , Or Gerlitz , Haggai Eran Subject: [PATCH v6 22/26] IB/Verbs: Use management helper cap_read_multi_sge() Date: Fri, 24 Apr 2015 14:23:46 +0200 Message-Id: <1429878230-11749-23-git-send-email-yun.wang@profitbricks.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1429878230-11749-1-git-send-email-yun.wang@profitbricks.com> References: <1429878230-11749-1-git-send-email-yun.wang@profitbricks.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2320 Lines: 64 Introduce helper cap_read_multi_sge() to help us check if the port of an IB device support RDMA Read Multiple Scatter-Gather Entries. Cc: Hal Rosenstock Cc: Steve Wise Cc: Tom Talpey Cc: Jason Gunthorpe Cc: Doug Ledford Cc: Ira Weiny Cc: Sean Hefty Signed-off-by: Michael Wang --- include/rdma/ib_verbs.h | 15 +++++++++++++++ net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 3 ++- 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 6e354df..4229ae2 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -1863,6 +1863,21 @@ static inline int cap_ib_mcast(struct ib_device *device, u8 port_num) return cap_ib_sa(device, port_num); } +/** + * cap_read_multi_sge - Check if the port of device has the capability + * RDMA Read Multiple Scatter-Gather Entries. + * + * @device: Device to be checked + * @port_num: Port number of the device + * + * Return 0 when port of the device don't support + * RDMA Read Multiple Scatter-Gather Entries. + */ +static inline int cap_read_multi_sge(struct ib_device *device, u8 port_num) +{ + return !rdma_tech_iwarp(device, port_num); +} + int ib_query_gid(struct ib_device *device, u8 port_num, int index, union ib_gid *gid); diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index a5bed5b..7711b7a 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c @@ -117,7 +117,8 @@ static void rdma_build_arg_xdr(struct svc_rqst *rqstp, static int rdma_read_max_sge(struct svcxprt_rdma *xprt, int sge_count) { - if (rdma_tech_iwarp(xprt->sc_cm_id->device, xprt->sc_cm_id->port_num)) + if (!cap_read_multi_sge(xprt->sc_cm_id->device, + xprt->sc_cm_id->port_num)) return 1; else return min_t(int, sge_count, xprt->sc_max_sge); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/