linux-kernel - [RFC v2 Optimizing veth xsk performance 9/9] veth: add support for AF_XDP tx need

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Message-Id: <20230807122641.85940-1-huangjie.albert@bytedance.com>
Date:   Mon,  7 Aug 2023 20:26:40 +0800
From:   Albert Huang <huangjie.albert@...edance.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Albert Huang <huangjie.albert@...edance.com>,
        "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 (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC v2 Optimizing veth xsk performance 9/9] veth: add support for AF_XDP tx need_wakup feature

this patch only support for tx need_wakup feature.

Signed-off-by: Albert Huang <huangjie.albert@...edance.com>
---
 drivers/net/veth.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 70489d017b51..7c60c64ef10b 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1447,9 +1447,9 @@ static int veth_xsk_tx_xmit(struct veth_sq *sq, struct xsk_buff_pool *xsk_pool,
 
 	memset(&tuple, 0, sizeof(tuple));
 
-	/* set xsk wake up flag, to do: where to disable */
+	/* clear xsk wake up flag */
 	if (xsk_uses_need_wakeup(xsk_pool))
-		xsk_set_tx_need_wakeup(xsk_pool);
+		xsk_clear_tx_need_wakeup(xsk_pool);
 
 	while (budget-- > 0) {
 		unsigned int truesize = 0;
@@ -1539,12 +1539,15 @@ static int veth_poll_tx(struct napi_struct *napi, int budget)
 	if (pool)
 		done  = veth_xsk_tx_xmit(sq, pool, budget);
 
-	rcu_read_unlock();
-
 	if (done < budget) {
+		/* set xsk wake up flag */
+		if (xsk_uses_need_wakeup(pool))
+			xsk_set_tx_need_wakeup(pool);
+
 		/* if done < budget, the tx ring is no buffer */
 		napi_complete_done(napi, done);
 	}
+	rcu_read_unlock();
 
 	return done;
 }
-- 
2.20.1