Commit 3a2c6ced90e1 ("i40e: Add a check to see if MFS is set") added
a warning message that reports unexpected size of port's MFS (max
frame size) value. This message use for the port number local
variable 'i' that is wrong.
In i40e_probe() this 'i' variable is used only to iterate VSIs
to find FDIR VSI:

<code>
...
/* if FDIR VSI was set up, start it now */
        for (i = 0; i < pf->num_alloc_vsi; i++) {
                if (pf->vsi[i] && pf->vsi[i]->type == I40E_VSI_FDIR) {
                        i40e_vsi_open(pf->vsi[i]);
                        break;
                }
        }
...
</code>

So the warning message use for the port number indext of FDIR VSI
if this exists or pf->num_alloc_vsi if not.

Fix the message by using 'pf->hw.port' for the port number.

Fixes: 3a2c6ced90e1 ("i40e: Add a check to see if MFS is set")
Signed-off-by: Ivan Vecera <ivecera@redhat.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 e870afa0e401..c36535145a41 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -16225,7 +16225,7 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	       I40E_PRTGL_SAH_MFS_MASK) >> I40E_PRTGL_SAH_MFS_SHIFT;
 	if (val < MAX_FRAME_SIZE_DEFAULT)
 		dev_warn(&pdev->dev, "MFS for port %x has been set below the default: %x\n",
-			 i, val);
+			 pf->hw.port, val);
 
 	/* Add a filter to drop all Flow control frames from any VSI from being
 	 * transmitted. By doing so we stop a malicious VF from sending out
-- 
2.41.0

On Fri, Nov 10, 2023 at 09:12:09AM +0100, Ivan Vecera wrote:
> Commit 3a2c6ced90e1 ("i40e: Add a check to see if MFS is set") added
> a warning message that reports unexpected size of port's MFS (max
> frame size) value. This message use for the port number local
> variable 'i' that is wrong.
> In i40e_probe() this 'i' variable is used only to iterate VSIs
> to find FDIR VSI:
> 
> <code>
> ...
> /* if FDIR VSI was set up, start it now */
>         for (i = 0; i < pf->num_alloc_vsi; i++) {
>                 if (pf->vsi[i] && pf->vsi[i]->type == I40E_VSI_FDIR) {
>                         i40e_vsi_open(pf->vsi[i]);
>                         break;
>                 }
>         }
> ...
> </code>
> 
> So the warning message use for the port number indext of FDIR VSI
> if this exists or pf->num_alloc_vsi if not.
> 
> Fix the message by using 'pf->hw.port' for the port number.
> 
> Fixes: 3a2c6ced90e1 ("i40e: Add a check to see if MFS is set")
> Signed-off-by: Ivan Vecera <ivecera@redhat.com>

Thanks Ivan,

I agree with your analysis that this change corrects the port number
printed. And that the problem is introduced in the cited commit.

Reviewed-by: Simon Horman <horms@kernel.org>