netdev - [PATCH net 4/7] ionic: Mark error paths in the data path as unlikely

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Date: Mon, 20 May 2024 18:37:12 -0700
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>
CC: <brett.creeley@....com>, <drivers@...sando.io>, Shannon Nelson
	<shannon.nelson@....com>
Subject: [PATCH net 4/7] ionic: Mark error paths in the data path as unlikely

From: Brett Creeley <brett.creeley@....com>

As the title states, mark unlikely error paths in the data path as
unlikely.

Fixes: 0f3154e6bcb3 ("ionic: Add Tx and Rx handling")
Signed-off-by: Brett Creeley <brett.creeley@....com>
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 .../net/ethernet/pensando/ionic/ionic_txrx.c  | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index c6aa8fb743be..14aa3844b699 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
@@ -582,7 +582,7 @@ static bool ionic_run_xdp(struct ionic_rx_stats *stats,
 					   buf_info->page_offset,
 					   true);
 		__netif_tx_unlock(nq);
-		if (err) {
+		if (unlikely(err)) {
 			netdev_dbg(netdev, "tx ionic_xdp_post_frame err %d\n", err);
 			goto out_xdp_abort;
 		}
@@ -597,7 +597,7 @@ static bool ionic_run_xdp(struct ionic_rx_stats *stats,
 			       IONIC_PAGE_SIZE, DMA_FROM_DEVICE);
 
 		err = xdp_do_redirect(netdev, &xdp_buf, xdp_prog);
-		if (err) {
+		if (unlikely(err)) {
 			netdev_dbg(netdev, "xdp_do_redirect err %d\n", err);
 			goto out_xdp_abort;
 		}
@@ -1058,7 +1058,7 @@ static dma_addr_t ionic_tx_map_single(struct ionic_queue *q,
 	dma_addr_t dma_addr;
 
 	dma_addr = dma_map_single(dev, data, len, DMA_TO_DEVICE);
-	if (dma_mapping_error(dev, dma_addr)) {
+	if (unlikely(dma_mapping_error(dev, dma_addr))) {
 		net_warn_ratelimited("%s: DMA single map failed on %s!\n",
 				     dev_name(dev), q->name);
 		q_to_tx_stats(q)->dma_map_err++;
@@ -1075,7 +1075,7 @@ static dma_addr_t ionic_tx_map_frag(struct ionic_queue *q,
 	dma_addr_t dma_addr;
 
 	dma_addr = skb_frag_dma_map(dev, frag, offset, len, DMA_TO_DEVICE);
-	if (dma_mapping_error(dev, dma_addr)) {
+	if (unlikely(dma_mapping_error(dev, dma_addr))) {
 		net_warn_ratelimited("%s: DMA frag map failed on %s!\n",
 				     dev_name(dev), q->name);
 		q_to_tx_stats(q)->dma_map_err++;
@@ -1316,7 +1316,7 @@ static int ionic_tx_tcp_inner_pseudo_csum(struct sk_buff *skb)
 	int err;
 
 	err = skb_cow_head(skb, 0);
-	if (err)
+	if (unlikely(err))
 		return err;
 
 	if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
@@ -1340,7 +1340,7 @@ static int ionic_tx_tcp_pseudo_csum(struct sk_buff *skb)
 	int err;
 
 	err = skb_cow_head(skb, 0);
-	if (err)
+	if (unlikely(err))
 		return err;
 
 	if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
@@ -1444,7 +1444,7 @@ static int ionic_tx_tso(struct net_device *netdev, struct ionic_queue *q,
 		err = ionic_tx_tcp_inner_pseudo_csum(skb);
 	else
 		err = ionic_tx_tcp_pseudo_csum(skb);
-	if (err) {
+	if (unlikely(err)) {
 		/* clean up mapping from ionic_tx_map_skb */
 		ionic_tx_desc_unmap_bufs(q, desc_info);
 		return err;
@@ -1729,7 +1729,7 @@ static int ionic_tx_descs_needed(struct ionic_queue *q, struct sk_buff *skb)
 linearize:
 	if (too_many_frags) {
 		err = skb_linearize(skb);
-		if (err)
+		if (unlikely(err))
 			return err;
 		q_to_tx_stats(q)->linearize++;
 	}
@@ -1763,7 +1763,7 @@ static netdev_tx_t ionic_start_hwstamp_xmit(struct sk_buff *skb,
 	else
 		err = ionic_tx(netdev, q, skb);
 
-	if (err)
+	if (unlikely(err))
 		goto err_out_drop;
 
 	return NETDEV_TX_OK;
@@ -1809,7 +1809,7 @@ netdev_tx_t ionic_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 	else
 		err = ionic_tx(netdev, q, skb);
 
-	if (err)
+	if (unlikely(err))
 		goto err_out_drop;
 
 	return NETDEV_TX_OK;
-- 
2.17.1