[PATCH] i40e: print correct hw max rss count in kernel ring buffer

[PATCH] i40e: print correct hw max rss count in kernel ring buffer

[Suresh Kumar]

The value printed for  "HW max RSS count" is wrong in kernel dmesg for i40e
NICs:

  ... i40e 0000:63:00.0: User requested queue count/HW max RSS count: 48/64

whereas  ethtool reports the correct value from "vsi->num_queue_pairs"

Channel parameters for eno33:
Pre-set maximums:
RX:     n/a
TX:     n/a
Other:      1
Combined:   96
Current hardware settings:
RX:     n/a
TX:     n/a
Other:      1
Combined:   96  <-------

and is misleading.

This value is printed from 'pf->rss_size_max' which seems hardcoded.

Below commit also removed this 64 limit:

Commit e56afa599609d3afe8b0ce24b553ab95e9782502
Author: Amritha Nambiar <amritha.nambiar@intel.com>
Date:   Wed Nov 8 16:38:43 2017 -0800

    i40e: Remove limit of 64 max queues per channel

Signed-off-by: Suresh Kumar <suresh2514@gmail.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index d5519af34657..f5c1ec190f7e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -12524,7 +12524,7 @@ int i40e_reconfig_rss_queues(struct i40e_pf *pf, int queue_count)
 		i40e_pf_config_rss(pf);
 	}
 	dev_info(&pf->pdev->dev, "User requested queue count/HW max RSS count:  %d/%d\n",
-		 vsi->req_queue_pairs, pf->rss_size_max);
+		 vsi->req_queue_pairs, vsi->num_queue_pairs);
 	return pf->alloc_rss_size;
 }
 
-- 
2.43.0

Re: [PATCH] i40e: print correct hw max rss count in kernel ring buffer

[Simon Horman]

On Fri, Jan 19, 2024 at 06:46:52PM +0530, Suresh Kumar wrote:
> The value printed for  "HW max RSS count" is wrong in kernel dmesg for i40e
> NICs:
> 
>   ... i40e 0000:63:00.0: User requested queue count/HW max RSS count: 48/64
> 
> whereas  ethtool reports the correct value from "vsi->num_queue_pairs"
> 
> Channel parameters for eno33:
> Pre-set maximums:
> RX:     n/a
> TX:     n/a
> Other:      1
> Combined:   96
> Current hardware settings:
> RX:     n/a
> TX:     n/a
> Other:      1
> Combined:   96  <-------
> 
> and is misleading.
> 
> This value is printed from 'pf->rss_size_max' which seems hardcoded.
> 
> Below commit also removed this 64 limit:
> 
> Commit e56afa599609d3afe8b0ce24b553ab95e9782502
> Author: Amritha Nambiar <amritha.nambiar@intel.com>
> Date:   Wed Nov 8 16:38:43 2017 -0800
> 
>     i40e: Remove limit of 64 max queues per channel

Hi Suresh,

I think it would be more normal to cite this commit something like this:

The limit of 64 was removed by
commit e56afa599609 ("i40e: Remove limit of 64 max queues per channel")

Also, it's not clear to me if this should be considered a fix or not.
If not, which I lean towards, then it should probably be targeted
at iwl-next.

	Subject: [PATCH iwl-next] ...

If it is a fix, then it should have a Fixes tag and probably
be targeted at iwl.

	Subject: [PATCH iwl] ...

...