diff options
| author | Steve Wise <swise@opengridcomputing.com> | 2018-06-18 18:05:26 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-06-18 22:17:28 +0300 |
| commit | 33023fb85a42b53bf778bc025f9667b582282be4 (patch) | |
| tree | 66d55701f7cc41636dcfc4353e38b4262791b47f /drivers/infiniband/hw/cxgb3 | |
| parent | b90575ce7b84483d46ebedd5c164e5f274f7ce5a (diff) | |
| download | linux-33023fb85a42b53bf778bc025f9667b582282be4.tar.xz | |
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/cxgb3')
| -rw-r--r-- | drivers/infiniband/hw/cxgb3/iwch_provider.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c index be097c6723c0..68bc2f9a532f 100644 --- a/drivers/infiniband/hw/cxgb3/iwch_provider.c +++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c @@ -1103,7 +1103,8 @@ static int iwch_query_device(struct ib_device *ibdev, struct ib_device_attr *pro props->max_mr_size = dev->attr.max_mr_size; props->max_qp = dev->attr.max_qps; props->max_qp_wr = dev->attr.max_wrs; - props->max_sge = dev->attr.max_sge_per_wr; + props->max_send_sge = dev->attr.max_sge_per_wr; + props->max_recv_sge = dev->attr.max_sge_per_wr; props->max_sge_rd = 1; props->max_qp_rd_atom = dev->attr.max_rdma_reads_per_qp; props->max_qp_init_rd_atom = dev->attr.max_rdma_reads_per_qp; |