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authorSteve Wise <swise@opengridcomputing.com>2018-06-18 08:05:26 -0700
committerJason Gunthorpe <jgg@mellanox.com>2018-06-18 13:17:28 -0600
commit33023fb85a42b53bf778bc025f9667b582282be4 (patch)
tree66d55701f7cc41636dcfc4353e38b4262791b47f /drivers/infiniband/hw/mthca/mthca_provider.c
parentIB/rxe: avoid unnecessary NULL check (diff)
downloadlinux-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/hw/mthca/mthca_provider.c')
-rw-r--r--drivers/infiniband/hw/mthca/mthca_provider.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index 541f237965c7..20febafc1fdd 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -96,8 +96,9 @@ static int mthca_query_device(struct ib_device *ibdev, struct ib_device_attr *pr
props->page_size_cap = mdev->limits.page_size_cap;
props->max_qp = mdev->limits.num_qps - mdev->limits.reserved_qps;
props->max_qp_wr = mdev->limits.max_wqes;
- props->max_sge = mdev->limits.max_sg;
- props->max_sge_rd = props->max_sge;
+ props->max_send_sge = mdev->limits.max_sg;
+ props->max_recv_sge = mdev->limits.max_sg;
+ props->max_sge_rd = mdev->limits.max_sg;
props->max_cq = mdev->limits.num_cqs - mdev->limits.reserved_cqs;
props->max_cqe = mdev->limits.max_cqes;
props->max_mr = mdev->limits.num_mpts - mdev->limits.reserved_mrws;