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

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Message-ID: <20240119131652.8050-1-suresh2514@gmail.com>
Date: Fri, 19 Jan 2024 18:46:52 +0530
From: Suresh Kumar <suresh2514@...il.com>
To: jesse.brandeburg@...el.com,
	anthony.l.nguyen@...el.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Suresh Kumar <suresh2514@...il.com>
Subject: [PATCH] i40e: print correct hw max rss count in kernel ring buffer

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@...el.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@...il.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