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IB/core: add max_send_sge and max_recv_sge attributes

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This patch replaces the ib_device_attr.max_sge with max_send_sge and
max_recv_sge. It allows ulps to take advantage of devices that have very
different send and recv sge depths.  For example cxgb4 has a max_recv_sge
of 4, yet a max_send_sge of 16.  Splitting out these attributes allows
much more efficient use of the SQ for cxgb4 with ulps that use the RDMA_RW
API. Consider a large RDMA WRITE that has 16 scattergather entries.
With max_sge of 4, the ulp would send 4 WRITE WRs, but with max_sge of
16, it can be done with 1 WRITE WR.

Acked-by: Sagi Grimberg <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Acked-by: Selvin Xavier <[email protected]>
Acked-by: Shiraz Saleem <[email protected]>
Acked-by: Dennis Dalessandro <[email protected]>
Signed-off-by: Steve Wise <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
This commit is contained in:
Steve Wise 2018-06-18 08:05:26 -07:00 • committed by Jason Gunthorpe
commit 33023fb85a
28 changed files with 65 additions and 39 deletions
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2
net/sunrpc/xprtrdma/svc_rdma_transport.c
View file

@ -476,7 +476,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
/* Qualify the transport resource defaults with the
* capabilities of this particular device */
newxprt->sc_max_send_sges = dev->attrs.max_sge;
newxprt->sc_max_send_sges = dev->attrs.max_send_sge;
/* transport hdr, head iovec, one page list entry, tail iovec */
if (newxprt->sc_max_send_sges < 4) {
pr_err("svcrdma: too few Send SGEs available (%d)\n",

2
net/sunrpc/xprtrdma/verbs.c
View file

@ -508,7 +508,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
unsigned int max_sge;
int rc;
max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge,
max_sge = min_t(unsigned int, ia->ri_device->attrs.max_send_sge,
RPCRDMA_MAX_SEND_SGES);
if (max_sge < RPCRDMA_MIN_SEND_SGES) {
pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge);