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| author | Steve Wise <swise@opengridcomputing.com> | 2018-06-18 08:05:26 -0700 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-06-18 13:17:28 -0600 |
| commit | 33023fb85a42b53bf778bc025f9667b582282be4 (patch) | |
| tree | 66d55701f7cc41636dcfc4353e38b4262791b47f /net/sunrpc | |
| parent | b90575ce7b84483d46ebedd5c164e5f274f7ce5a (diff) | |
| download | linux-33023fb85a42b53bf778bc025f9667b582282be4.tar.gz linux-33023fb85a42b53bf778bc025f9667b582282be4.tar.bz2 linux-33023fb85a42b53bf778bc025f9667b582282be4.zip | |
IB/core: add max_send_sge and max_recv_sge attributes
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 <sagi@grimberg.me>
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: Selvin Xavier <selvin.xavier@broadcom.com>
Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>
Acked-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_transport.c | 2 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/verbs.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index e9535a66bab0..547b2cdf1427 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -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", diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 16161a36dc73..112a15abc4a4 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -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); |