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IB/Verbs: Use management helper rdma_cap_read_multi_sge() 

Introduce helper rdma_cap_read_multi_sge() to help us check if the port of an
IB device support RDMA Read Multiple Scatter-Gather Entries.

Signed-off-by: Michael Wang <yun.wang@profitbricks.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Tested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Michael Wang 2015-05-05 14:50:38 +02:00 committed by Doug Ledford
parent a31ad3b0e3
commit bc0f1d7153
2 changed files with 18 additions and 2 deletions
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16
include/rdma/ib_verbs.h
View File

@ -1864,6 +1864,22 @@ static inline bool rdma_cap_ib_mcast(struct ib_device *device, u8 port_num)
return rdma_cap_ib_sa(device, port_num);
}
/**
* rdma_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 false when port of the device don't support
* RDMA Read Multiple Scatter-Gather Entries.
*/
static inline bool rdma_cap_read_multi_sge(struct ib_device *device,
u8 port_num)
{
return !rdma_protocol_iwarp(device, port_num);
}
int ib_query_gid(struct ib_device *device,
u8 port_num, int index, union ib_gid *gid);

4
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@ -117,8 +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_protocol_iwarp(xprt->sc_cm_id->device,
xprt->sc_cm_id->port_num))
if (!rdma_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);