linux-kernel - [PATCH net-next 13/14] net: ethernet: mtk_eth_soc: set PPE flow hash as skb hash if present

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Message-Id: <20210422040914.47788-14-ilya.lipnitskiy@gmail.com>
Date:   Wed, 21 Apr 2021 21:09:13 -0700
From:   Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
To:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Subject: [PATCH net-next 13/14] net: ethernet: mtk_eth_soc: set PPE flow hash as skb hash if present

From: Felix Fietkau <nbd@....name>

This improves GRO performance

Signed-off-by: Felix Fietkau <nbd@....name>
[Ilya: Use MTK_RXD4_FOE_ENTRY instead of GENMASK(13, 0)]
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 88a437f478fd..8c863322587e 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/pinctrl/devinfo.h>
 #include <linux/phylink.h>
+#include <linux/jhash.h>
 #include <net/dsa.h>
 
 #include "mtk_eth_soc.h"
@@ -1248,6 +1249,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		struct net_device *netdev;
 		unsigned int pktlen;
 		dma_addr_t dma_addr;
+		u32 hash;
 		int mac;
 
 		ring = mtk_get_rx_ring(eth);
@@ -1317,6 +1319,12 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		skb->protocol = eth_type_trans(skb, netdev);
 		bytes += pktlen;
 
+		hash = trxd.rxd4 & MTK_RXD4_FOE_ENTRY;
+		if (hash != MTK_RXD4_FOE_ENTRY) {
+			hash = jhash_1word(hash, 0);
+			skb_set_hash(skb, hash, PKT_HASH_TYPE_L4);
+		}
+
 		if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX &&
 		    (trxd.rxd2 & RX_DMA_VTAG))
 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
-- 
2.31.1