netdev - [net-next PATCH v2 1/4] act_skbedit: Add support for action skbedit RX queue mapping

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Date:   Wed, 07 Sep 2022 18:24:02 -0700
From:   Amritha Nambiar <amritha.nambiar@...el.com>
To:     netdev@...r.kernel.org, kuba@...nel.org
Cc:     alexander.duyck@...il.com, jhs@...atatu.com, jiri@...nulli.us,
        xiyou.wangcong@...il.com, vinicius.gomes@...el.com,
        sridhar.samudrala@...el.com, amritha.nambiar@...el.com
Subject: [net-next PATCH v2 1/4] act_skbedit: Add support for action skbedit
 RX queue mapping

The skbedit action in tc allows the selection of transmit queue
in an interface with multiple queues. This patch extends this
ability of skedit action by supporting the selection of receive
queue on which the packets would arrive.

Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
Signed-off-by: Amritha Nambiar <amritha.nambiar@...el.com>
---
 net/sched/act_skbedit.c |   29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
index e3bd11dfe1ca..9b8274d09117 100644
--- a/net/sched/act_skbedit.c
+++ b/net/sched/act_skbedit.c
@@ -37,6 +37,24 @@ static u16 tcf_skbedit_hash(struct tcf_skbedit_params *params,
 	return netdev_cap_txqueue(skb->dev, queue_mapping);
 }
 
+static void tcf_skbedit_act_txq(struct tcf_skbedit_params *params,
+				struct sk_buff *skb)
+{
+	if (skb->dev->real_num_tx_queues > params->queue_mapping) {
+#ifdef CONFIG_NET_EGRESS
+		netdev_xmit_skip_txqueue(true);
+#endif
+		skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb));
+	}
+}
+
+static void tcf_skbedit_act_rxq(struct tcf_skbedit_params *params,
+				struct sk_buff *skb)
+{
+	if (skb->dev->real_num_rx_queues > params->queue_mapping)
+		skb_record_rx_queue(skb, params->queue_mapping);
+}
+
 static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a,
 			   struct tcf_result *res)
 {
@@ -71,12 +89,11 @@ static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a,
 			break;
 		}
 	}
-	if (params->flags & SKBEDIT_F_QUEUE_MAPPING &&
-	    skb->dev->real_num_tx_queues > params->queue_mapping) {
-#ifdef CONFIG_NET_EGRESS
-		netdev_xmit_skip_txqueue(true);
-#endif
-		skb_set_queue_mapping(skb, tcf_skbedit_hash(params, skb));
+	if (params->flags & SKBEDIT_F_QUEUE_MAPPING) {
+		if (!skb_at_tc_ingress(skb))
+			tcf_skbedit_act_txq(params, skb);
+		else
+			tcf_skbedit_act_rxq(params, skb);
 	}
 	if (params->flags & SKBEDIT_F_MARK) {
 		skb->mark &= ~params->mask;