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 /fs/cifs/smbdirect.c | |
| parent | b90575ce7b84483d46ebedd5c164e5f274f7ce5a (diff) | |
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 'fs/cifs/smbdirect.c')
| -rw-r--r-- | fs/cifs/smbdirect.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c index e459c97151b3..c5a1cddd8856 100644 --- a/fs/cifs/smbdirect.c +++ b/fs/cifs/smbdirect.c @@ -1661,9 +1661,16 @@ static struct smbd_connection *_smbd_get_connection( info->max_receive_size = smbd_max_receive_size; info->keep_alive_interval = smbd_keep_alive_interval; - if (info->id->device->attrs.max_sge < SMBDIRECT_MAX_SGE) { - log_rdma_event(ERR, "warning: device max_sge = %d too small\n", - info->id->device->attrs.max_sge); + if (info->id->device->attrs.max_send_sge < SMBDIRECT_MAX_SGE) { + log_rdma_event(ERR, + "warning: device max_send_sge = %d too small\n", + info->id->device->attrs.max_send_sge); + log_rdma_event(ERR, "Queue Pair creation may fail\n"); + } + if (info->id->device->attrs.max_recv_sge < SMBDIRECT_MAX_SGE) { + log_rdma_event(ERR, + "warning: device max_recv_sge = %d too small\n", + info->id->device->attrs.max_recv_sge); log_rdma_event(ERR, "Queue Pair creation may fail\n"); } |