linux-kernel - [PATCH net-next v2 2/2] net: ethernet: mtk_eth_soc: use PP exclusively for XDP programs

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Message-ID: <20240729183038.1959-3-eladwf@gmail.com>
Date: Mon, 29 Jul 2024 21:29:55 +0300
From: Elad Yifee <eladwf@...il.com>
To: Felix Fietkau <nbd@....name>,
	Sean Wang <sean.wang@...iatek.com>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Cc: Elad Yifee <eladwf@...il.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Joe Damato <jdamato@...tly.com>
Subject: [PATCH net-next v2 2/2] net: ethernet: mtk_eth_soc: use PP exclusively for XDP programs

PP allocations and XDP code path traversal are unnecessary
when no XDP program is loaded.
Prevent that by simply not creating the pool.
This change boosts driver performance for this use case,
allowing the CPU to handle about 13% more packets/sec.

Signed-off-by: Elad Yifee <eladwf@...il.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 4d0052dbe3f4..2d1a48287c73 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2644,7 +2644,7 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag)
 	if (!ring->data)
 		return -ENOMEM;
 
-	if (mtk_page_pool_enabled(eth)) {
+	if (mtk_page_pool_enabled(eth) && rcu_access_pointer(eth->prog)) {
 		struct page_pool *pp;
 
 		pp = mtk_create_page_pool(eth, &ring->xdp_q, ring_no,
-- 
2.45.2