doc/mlx4: set limitation for RSS
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Commit Message
This adds a limitation explanation on RSS queue usage
for MLX4 pmd.
MLX4 pmd requires a power of two queues to do RSS
but, the user can still open more queues which can be utilized
through flow API.
Signed-off-by: Raslan Darawsheh <rasland@nvidia.com>
---
doc/guides/nics/mlx4.rst | 12 ++++++++++++
1 file changed, 12 insertions(+)
Comments
19/11/2023 14:24, Raslan Darawsheh:
> This adds a limitation explanation on RSS queue usage
> for MLX4 pmd.
>
> MLX4 pmd requires a power of two queues to do RSS
> but, the user can still open more queues which can be utilized
> through flow API.
>
> Signed-off-by: Raslan Darawsheh <rasland@nvidia.com>
Applied with few indent fixes, thanks.
@@ -145,6 +145,18 @@ Limitations
- TSO (Transmit Segmentation Offload) is supported in OFED version
4.4 and above.
+- RSS only works on power of two number of queues.
+- The user can open none power of two queues, but the PMD will round down
+ to the highest power of two queues by default for RSS.
+ Other queues can be utilized through flow API.
+ example::
+ ./dpdk-testpmd -a 08:00.0 -- -i --rxq 12 --txq 12 --rss-ip
+
+ The first 8 queues will be used by default for RSS over IP.
+ The rest of the queues can be utilized through rte flow like the following::
+ flow create 0 ingress pattern eth / ipv4 / tcp / end actions rss queues 8 9 10 11 end / end
+
+
Prerequisites
-------------