netdev - [PATCH net-next 4/5] ionic: Make the check for Tx HW timestamping more obvious

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Mon, 4 Dec 2023 13:09:35 -0800
From: Shannon Nelson <shannon.nelson@....com>
To: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
	<edumazet@...gle.com>, <pabeni@...hat.com>
CC: <f.fainelli@...il.com>, <brett.creeley@....com>, <drivers@...sando.io>,
	Shannon Nelson <shannon.nelson@....com>
Subject: [PATCH net-next 4/5] ionic: Make the check for Tx HW timestamping more obvious

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

Currently the checks are:

[1] unlikely(q->features & IONIC_TXQ_F_HWSTAMP)
[2] !unlikely(q->features & IONIC_TXQ_F_HWSTAMP)

[1] is clear enough, but [2] isn't exactly obvious to the
reader because !unlikely reads as likely. However, that's
not what this means.

[2] means that it's unlikely that the q has
IONIC_TXQ_F_HWSTAMP enabled.

Write an inline helper function to hide the unlikely
optimization to make these checks more readable.

Signed-off-by: Brett Creeley <brett.creeley@....com>
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.h  |  5 +++++
 drivers/net/ethernet/pensando/ionic/ionic_txrx.c | 10 +++++-----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index 457c24195ca6..61548b3eea93 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -312,6 +312,11 @@ static inline u32 ionic_coal_usec_to_hw(struct ionic *ionic, u32 usecs)
 	return (usecs * mult) / div;
 }
 
+static inline bool ionic_txq_hwstamp_enabled(struct ionic_queue *q)
+{
+	return unlikely(q->features & IONIC_TXQ_F_HWSTAMP);
+}
+
 void ionic_link_status_check_request(struct ionic_lif *lif, bool can_sleep);
 void ionic_get_stats64(struct net_device *netdev,
 		       struct rtnl_link_stats64 *ns);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index ccc1b1d407e4..54cd96b035d6 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
@@ -803,7 +803,7 @@ static void ionic_tx_clean(struct ionic_queue *q,
 
 	qi = skb_get_queue_mapping(skb);
 
-	if (unlikely(q->features & IONIC_TXQ_F_HWSTAMP)) {
+	if (ionic_txq_hwstamp_enabled(q)) {
 		if (cq_info) {
 			struct skb_shared_hwtstamps hwts = {};
 			__le64 *cq_desc_hwstamp;
@@ -870,7 +870,7 @@ bool ionic_tx_service(struct ionic_cq *cq, struct ionic_cq_info *cq_info)
 		desc_info->cb_arg = NULL;
 	} while (index != le16_to_cpu(comp->comp_index));
 
-	if (pkts && bytes && !unlikely(q->features & IONIC_TXQ_F_HWSTAMP))
+	if (pkts && bytes && !ionic_txq_hwstamp_enabled(q))
 		netdev_tx_completed_queue(q_to_ndq(q), pkts, bytes);
 
 	return true;
@@ -908,7 +908,7 @@ void ionic_tx_empty(struct ionic_queue *q)
 		desc_info->cb_arg = NULL;
 	}
 
-	if (pkts && bytes && !unlikely(q->features & IONIC_TXQ_F_HWSTAMP))
+	if (pkts && bytes && !ionic_txq_hwstamp_enabled(q))
 		netdev_tx_completed_queue(q_to_ndq(q), pkts, bytes);
 }
 
@@ -986,7 +986,7 @@ static void ionic_tx_tso_post(struct ionic_queue *q,
 
 	if (start) {
 		skb_tx_timestamp(skb);
-		if (!unlikely(q->features & IONIC_TXQ_F_HWSTAMP))
+		if (!ionic_txq_hwstamp_enabled(q))
 			netdev_tx_sent_queue(q_to_ndq(q), skb->len);
 		ionic_txq_post(q, false, ionic_tx_clean, skb);
 	} else {
@@ -1233,7 +1233,7 @@ static int ionic_tx(struct ionic_queue *q, struct sk_buff *skb)
 	stats->pkts++;
 	stats->bytes += skb->len;
 
-	if (!unlikely(q->features & IONIC_TXQ_F_HWSTAMP))
+	if (!ionic_txq_hwstamp_enabled(q))
 		netdev_tx_sent_queue(q_to_ndq(q), skb->len);
 	ionic_txq_post(q, !netdev_xmit_more(), ionic_tx_clean, skb);
 
-- 
2.17.1