Introduce helper cap_read_multi_sge() to help us check if the port of an
IB device support RDMA Read Multiple Scatter-Gather Entries.
Reform svc_rdma_accept() to adopt management helpers.
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>
---
include/rdma/ib_verbs.h | 15 +++++++++++++++
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 4 ++--
net/sunrpc/xprtrdma/svc_rdma_transport.c | 12 +++++-------
3 files changed, 22 insertions(+), 9 deletions(-)
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 9db8966..cae6f2d 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1849,6 +1849,21 @@ static inline int cap_ib_mcast(struct ib_device *device,
u8 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_transport_iwarp(device, port_num);
+}
+
+/**
* cap_ipoib - Check if the port of device has the capability
* IP over Infiniband.
*
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index e011027..604d035 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -118,8 +118,8 @@ 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_node_get_transport(xprt->sc_cm_id->device->node_type) ==
- RDMA_TRANSPORT_IWARP)
+ 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);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c
b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 4e61880..e75175d 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -979,8 +979,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt
*xprt)
/*
* Determine if a DMA MR is required and if so, what privs are required
*/
- switch (rdma_node_get_transport(newxprt->sc_cm_id->device->node_type)) {
- case RDMA_TRANSPORT_IWARP:
+ if (rdma_transport_iwarp(newxprt->sc_cm_id->device,
+ newxprt->sc_cm_id->port_num)) {
newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV;
if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) {
need_dma_mr = 1;
@@ -992,8 +992,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt
*xprt)
dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
} else
need_dma_mr = 0;
- break;
- case RDMA_TRANSPORT_IB:
+ } else if (rdma_ib_mgmt(newxprt->sc_cm_id->device,
+ newxprt->sc_cm_id->port_num)) {
if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) {
need_dma_mr = 1;
dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
@@ -1003,10 +1003,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt
*xprt)
dma_mr_acc = IB_ACCESS_LOCAL_WRITE;
} else
need_dma_mr = 0;
- break;
- default:
+ } else
goto errout;
- }
/* Create the DMA MR if needed, otherwise, use the DMA LKEY */
if (need_dma_mr) {
--
2.1.0
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