On Mon, Apr 20, 2015 at 10:42:07AM +0200, Michael Wang wrote:
>
> 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 <h...@dev.mellanox.co.il>
> Cc: Steve Wise <sw...@opengridcomputing.com>
> Cc: Tom Talpey <t...@talpey.com>
> Cc: Jason Gunthorpe <jguntho...@obsidianresearch.com>
> Cc: Doug Ledford <dledf...@redhat.com>
> Cc: Ira Weiny <ira.we...@intel.com>
> Cc: Sean Hefty <sean.he...@intel.com>
> Signed-off-by: Michael Wang <yun.w...@profitbricks.com>
Reviewed-by: Ira Weiny <ira.we...@intel.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 d0ae08e..074f66d 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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