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    Subject[PATCH v4 23/27] IB/Verbs: Use management helper cap_read_multi_sge()

    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: Steve Wise <swise@opengridcomputing.com>
    Cc: Tom Talpey <tom@talpey.com>
    Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
    Cc: Doug Ledford <dledford@redhat.com>
    Cc: Ira Weiny <ira.weiny@intel.com>
    Cc: Sean Hefty <sean.hefty@intel.com>
    Signed-off-by: Michael Wang <yun.wang@profitbricks.com>
    ---
    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 ac62b3a..60f7efb 100644
    --- a/include/rdma/ib_verbs.h
    +++ b/include/rdma/ib_verbs.h
    @@ -1878,6 +1878,21 @@ static inline int cap_ipoib(struct ib_device *device, u8 port_num)
    return rdma_tech_ib(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

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