diff options
| 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 /drivers/infiniband/ulp/srpt/ib_srpt.c | |
| parent | IB/rxe: avoid unnecessary NULL check (diff) | |
| download | linux-dev-33023fb85a42b53bf778bc025f9667b582282be4.tar.xz linux-dev-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 'drivers/infiniband/ulp/srpt/ib_srpt.c')
| -rw-r--r-- | drivers/infiniband/ulp/srpt/ib_srpt.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c index 698f7779e231..1b0b285a0ae0 100644 --- a/drivers/infiniband/ulp/srpt/ib_srpt.c +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c @@ -1753,13 +1753,15 @@ retry: */ qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr); qp_init->cap.max_rdma_ctxs = sq_size / 2; - qp_init->cap.max_send_sge = min(attrs->max_sge, SRPT_MAX_SG_PER_WQE); + qp_init->cap.max_send_sge = min(attrs->max_send_sge, + SRPT_MAX_SG_PER_WQE); qp_init->port_num = ch->sport->port; if (sdev->use_srq) { qp_init->srq = sdev->srq; } else { qp_init->cap.max_recv_wr = ch->rq_size; - qp_init->cap.max_recv_sge = qp_init->cap.max_send_sge; + qp_init->cap.max_recv_sge = min(attrs->max_recv_sge, + SRPT_MAX_SG_PER_WQE); } if (ch->using_rdma_cm) { |