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>
diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index e459c97..c5a1cdd 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");
}