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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 /include/rdma/ib_verbs.h | |
| 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 'include/rdma/ib_verbs.h')
| -rw-r--r-- | include/rdma/ib_verbs.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 0232c0f9f717..dc5d262739e5 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -345,7 +345,8 @@ struct ib_device_attr { int max_qp; int max_qp_wr; u64 device_cap_flags; - int max_sge; + int max_send_sge; + int max_recv_sge; int max_sge_rd; int max_cq; int max_cqe; |