[PATCH net-next v2] Documentation: net/smc: correct old value of smcr_max_recv_wr

Mahanta Jambigi
2026-04-24T05:23:51Z

The smc-sysctl.rst documentation incorrectly stated that the previous
hardcoded maximum number of WR buffers on the receive path (smcr_max_recv_wr)
was 16. The correct historical value used before the introduction of the sysctl
control was 48. Update the documentation to reflect the accurate historical
value. Also fix a couple of minor typos.

Fixes: aef3cdb47bbb net/smc: make wr buffer count configurable
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Sidraya Jayagond <sidraya@linux.ibm.com>
Signed-off-by: Mahanta Jambigi <mjambigi@linux.ibm.com>
---
v2: Addressed few minor comments from Alexandra Winter.
---
Documentation/networking/smc-sysctl.rst | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst
index a8b4f357174e..93cc6244f6c8 100644
--- a/Documentation/networking/smc-sysctl.rst
+++ b/Documentation/networking/smc-sysctl.rst
@@ -86,7 +86,7 @@ smcr_max_send_wr - INTEGER
Please be aware that all the buffers need to be allocated as a physically
continuous array in which each element is a single buffer and has the size
of SMC_WR_BUF_SIZE (48) bytes. If the allocation fails, we keep retrying
- with half of the buffer count until it is ether successful or (unlikely)
+ with half of the buffer count until it is either successful or (unlikely)
we dip below the old hard coded value which is 16 where we give up much
like before having this control.

@@ -100,14 +100,14 @@ smcr_max_recv_wr - INTEGER
depending on the workload it can be a bottleneck in a sense that threads
have to wait for work request buffers to become available. Before the
introduction of this control the maximal number of work request buffers
- available on the receive path used to be hard coded to 16. With this control
+ available on the receive path used to be hard coded to 48. With this control
it becomes configurable. The acceptable range is between 2 and 2048.

Please be aware that all the buffers need to be allocated as a physically
continuous array in which each element is a single buffer and has the size
of SMC_WR_BUF_SIZE (48) bytes. If the allocation fails, we keep retrying
- with half of the buffer count until it is ether successful or (unlikely)
- we dip below the old hard coded value which is 16 where we give up much
+ with half of the buffer count until it is either successful or (unlikely)
+ we dip below the old hard coded value which is 48 where we give up much
like before having this control.

Default: 48
--
2.51.0