netdev - [PATCH] PATCH: i40e Improve trusted VF MAC addresses logging when limit is reached

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Message-ID: <20250805132149.2601995-1-dhill@redhat.com>
Date: Tue,  5 Aug 2025 09:21:49 -0400
From: David Hill <dhill@...hat.com>
To: netdev@...r.kernel.org
Cc: horms@...nel.org,
	anthony.l.nguyen@...el.com,
	przemyslaw.kitszel@...el.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	David Hill <dhill@...hat.com>
Subject: [PATCH] PATCH: i40e Improve trusted VF MAC addresses logging when limit is reached

When a VF reaches the limit introduced in this commit [1], the host reports
an error in the syslog but doesn't mention which VF reached its limit and
what the limit is actually is which makes troubleshooting of networking
issue a bit tedious.   This commit simply improves this error reporting
by adding which VF number has reached a limit and what that limit is.

[1] commit cfb1d572c986 ("i40e: Add ensurance of MacVlan resources for every
trusted VF")

Signed-off-by: David Hill <dhill@...hat.com>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 9b8efdeafbcf..eb587e2bb35f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -2911,6 +2911,8 @@ static inline int i40e_check_vf_permission(struct i40e_vf *vf,
 			return -EINVAL;
 		}
 
+		int new_count = i40e_count_filters(vsi) + mac2add_cnt;
+		int max_macvlan = I40E_VC_MAX_MACVLAN_PER_TRUSTED_VF(pf->num_alloc_vfs, hw->num_ports);
 		/* If the host VMM administrator has set the VF MAC address
 		 * administratively via the ndo_set_vf_mac command then deny
 		 * permission to the VF to add or delete unicast MAC addresses.
@@ -2937,8 +2939,7 @@ static inline int i40e_check_vf_permission(struct i40e_vf *vf,
 	 * push us over the limit.
 	 */
 	if (!test_bit(I40E_VIRTCHNL_VF_CAP_PRIVILEGE, &vf->vf_caps)) {
-		if ((i40e_count_filters(vsi) + mac2add_cnt) >
-		    I40E_VC_MAX_MAC_ADDR_PER_VF) {
+		if ( new_count > I40E_VC_MAX_MAC_ADDR_PER_VF) {
 			dev_err(&pf->pdev->dev,
 				"Cannot add more MAC addresses, VF is not trusted, switch the VF to trusted to add more functionality\n");
 			return -EPERM;
@@ -2949,11 +2950,10 @@ static inline int i40e_check_vf_permission(struct i40e_vf *vf,
 	 * all VFs.
 	 */
 	} else {
-		if ((i40e_count_filters(vsi) + mac2add_cnt) >
-		    I40E_VC_MAX_MACVLAN_PER_TRUSTED_VF(pf->num_alloc_vfs,
-						       hw->num_ports)) {
+		if (new_count > max_macvlan) {
 			dev_err(&pf->pdev->dev,
-				"Cannot add more MAC addresses, trusted VF exhausted it's resources\n");
+				"Cannot add more MAC addresses, trusted VF %d uses (%d/%d) MAC addresses\n",
+				vf->vf_id, new_count, max_macvlan);
 			return -EPERM;
 		}
 	}
-- 
2.50.1


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