Re: [PATCH v5 23/27] IB/Verbs: Use management helper cap_read_multi_sge()

[ira.weiny]

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 <hal@xxxxxxxxxxxxxxxxxx>
> Cc: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
> Cc: Tom Talpey <tom@xxxxxxxxxx>
> Cc: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
> Cc: Doug Ledford <dledford@xxxxxxxxxx>
> Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
> Cc: Sean Hefty <sean.hefty@xxxxxxxxx>
> Signed-off-by: Michael Wang <yun.wang@xxxxxxxxxxxxxxxx>

Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>

> ---
>  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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