netdev - [PATCH net-next 7/7] mlxsw: pci: Use napi_consume_skb() to free SKB as part of Tx completion

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Message-ID: <a9f9f3dc884c0d1be4bd4c9d72030c88c7ac004f.1718709196.git.petrm@nvidia.com>
Date: Tue, 18 Jun 2024 13:34:46 +0200
From: Petr Machata <petrm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>, "Amit
 Cohen" <amcohen@...dia.com>, <mlxsw@...dia.com>
Subject: [PATCH net-next 7/7] mlxsw: pci: Use napi_consume_skb() to free SKB as part of Tx completion

From: Amit Cohen <amcohen@...dia.com>

Currently, as part of Tx completion, the driver calls dev_kfree_skb_any()
to free the SKB. For this flow, the correct function is napi_consume_skb().
This function and dev_consume_skb_any() were added to be used for consumed
SKBs, which were not dropped, so the skb:kfree_skb tracepoint is not
triggered, and we can get better diagnostics about dropped packets.

Signed-off-by: Amit Cohen <amcohen@...dia.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
Signed-off-by: Petr Machata <petrm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/pci.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/pci.c b/drivers/net/ethernet/mellanox/mlxsw/pci.c
index 498b0867f9aa..2fe29dba8751 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/pci.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/pci.c
@@ -541,7 +541,7 @@ static void mlxsw_pci_cqe_sdq_handle(struct mlxsw_pci *mlxsw_pci,
 				     struct mlxsw_pci_queue *q,
 				     u16 consumer_counter_limit,
 				     enum mlxsw_pci_cqe_v cqe_v,
-				     char *cqe)
+				     char *cqe, int budget)
 {
 	struct pci_dev *pdev = mlxsw_pci->pdev;
 	struct mlxsw_pci_queue_elem_info *elem_info;
@@ -567,7 +567,7 @@ static void mlxsw_pci_cqe_sdq_handle(struct mlxsw_pci *mlxsw_pci,
 	}
 
 	if (skb)
-		dev_kfree_skb_any(skb);
+		napi_consume_skb(skb, budget);
 	elem_info->sdq.skb = NULL;
 
 	if (q->consumer_counter++ != consumer_counter_limit)
@@ -819,7 +819,7 @@ static int mlxsw_pci_napi_poll_cq_tx(struct napi_struct *napi, int budget)
 		mlxsw_pci_queue_doorbell_consumer_ring(mlxsw_pci, q);
 
 		mlxsw_pci_cqe_sdq_handle(mlxsw_pci, sdq,
-					 wqe_counter, q->u.cq.v, ncqe);
+					 wqe_counter, q->u.cq.v, ncqe, budget);
 
 		work_done++;
 	}
-- 
2.45.0