netdev - [PATCH net 3/3] bnxt_en: Restore PTP tx_avail count in case of skb

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Date: Tue, 18 Jun 2024 14:53:13 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	pavan.chebbi@...adcom.com,
	andrew.gospodarek@...adcom.com
Subject: [PATCH net 3/3] bnxt_en: Restore PTP tx_avail count in case of skb_pad() error

From: Pavan Chebbi <pavan.chebbi@...adcom.com>

The current code only restores PTP tx_avail count when we get DMA
mapping errors.  Fix it so that the PTP tx_avail count will be
restored for both DMA mapping errors and skb_pad() errors.
Otherwise PTP TX timestamp will not be available after a PTP
packet hits the skb_pad() error.

Fixes: 83bb623c968e ("bnxt_en: Transmit and retrieve packet timestamps"
Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 89d29d6d7517..a6d69a45fa01 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -732,9 +732,6 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 
 tx_dma_error:
-	if (BNXT_TX_PTP_IS_SET(lflags))
-		atomic_inc(&bp->ptp_cfg->tx_avail);
-
 	last_frag = i;
 
 	/* start back at beginning and unmap skb */
@@ -756,6 +753,8 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev)
 tx_free:
 	dev_kfree_skb_any(skb);
 tx_kick_pending:
+	if (BNXT_TX_PTP_IS_SET(lflags))
+		atomic_inc(&bp->ptp_cfg->tx_avail);
 	if (txr->kick_pending)
 		bnxt_txr_db_kick(bp, txr, txr->tx_prod);
 	txr->tx_buf_ring[txr->tx_prod].skb = NULL;
-- 
2.30.1


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