linux-kernel - Re: [PATCH v5 23/27] IB/Verbs: Use management helper cap_read_multi

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Message-ID: <20150422001124.GW15893@phlsvsds.ph.intel.com>
Date:	Tue, 21 Apr 2015 20:11:25 -0400
From:	"ira.weiny" <ira.weiny@...el.com>
To:	Michael Wang <yun.wang@...fitbricks.com>
Cc:	Roland Dreier <roland@...nel.org>,
	Sean Hefty <sean.hefty@...el.com>, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, hal@....mellanox.co.il,
	Tom Tucker <tom@...ngridcomputing.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	Mike Marciniszyn <infinipath@...el.com>,
	Eli Cohen <eli@...lanox.com>,
	Faisal Latif <faisal.latif@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Tom Talpey <tom@...pey.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Doug Ledford <dledford@...hat.com>
Subject: Re: [PATCH v5 23/27] IB/Verbs: Use management helper cap_read_multi_sge()

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@....mellanox.co.il>
> Cc: Steve Wise <swise@...ngridcomputing.com>
> Cc: Tom Talpey <tom@...pey.com>
> Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> Cc: Doug Ledford <dledford@...hat.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Sean Hefty <sean.hefty@...el.com>
> Signed-off-by: Michael Wang <yun.wang@...fitbricks.com>

Reviewed-by: Ira Weiny <ira.weiny@...el.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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