netdev - [PATCH v2 net-next] net: ethernet: mtk-ppe: fix traffic offload with bridged wlan

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Message-Id: <c79ed39af42540a6ce2cd145c4ddbcb98491630b.1658473427.git.lorenzo@kernel.org>
Date:   Fri, 22 Jul 2022 09:06:19 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     netdev@...r.kernel.org
Cc:     nbd@....name, john@...ozen.org, sean.wang@...iatek.com,
        Mark-MC.Lee@...iatek.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, pablo@...filter.org,
        matthias.bgg@...il.com, linux-mediatek@...ts.infradead.org,
        lorenzo.bianconi@...hat.com, Ryder.Lee@...iatek.com,
        Evelyn.Tsai@...iatek.com, pvalerio@...hat.com
Subject: [PATCH v2 net-next] net: ethernet: mtk-ppe: fix traffic offload with bridged wlan

A typical flow offload scenario for OpenWrt users is routed traffic
received by the wan interface that is redirected to a wlan device
belonging to the lan bridge. Current implementation fails to
fill wdma offload info in mtk_flow_get_wdma_info() since odev device is
the local bridge. Fix the issue running dev_fill_forward_path routine in
mtk_flow_get_wdma_info in order to identify the wlan device.

Tested-by: Paolo Valerio <pvalerio@...hat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
Changes since v1:
- rebase on top of net-next master
---
 .../net/ethernet/mediatek/mtk_ppe_offload.c   | 30 ++++++++-----------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
index 5d457bc9acc1..25dc3c3aa31d 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
@@ -88,32 +88,28 @@ mtk_flow_offload_mangle_eth(const struct flow_action_entry *act, void *eth)
 static int
 mtk_flow_get_wdma_info(struct net_device *dev, const u8 *addr, struct mtk_wdma_info *info)
 {
-	struct net_device_path_ctx ctx = {
-		.dev = dev,
-	};
-	struct net_device_path path = {};
+	struct net_device_path_stack stack;
+	struct net_device_path *path;
+	int err;
 
-	if (!ctx.dev)
+	if (!dev)
 		return -ENODEV;
 
-	memcpy(ctx.daddr, addr, sizeof(ctx.daddr));
-
 	if (!IS_ENABLED(CONFIG_NET_MEDIATEK_SOC_WED))
 		return -1;
 
-	if (!dev->netdev_ops->ndo_fill_forward_path)
-		return -1;
-
-	if (dev->netdev_ops->ndo_fill_forward_path(&ctx, &path))
-		return -1;
+	err = dev_fill_forward_path(dev, addr, &stack);
+	if (err)
+		return err;
 
-	if (path.type != DEV_PATH_MTK_WDMA)
+	path = &stack.path[stack.num_paths - 1];
+	if (path->type != DEV_PATH_MTK_WDMA)
 		return -1;
 
-	info->wdma_idx = path.mtk_wdma.wdma_idx;
-	info->queue = path.mtk_wdma.queue;
-	info->bss = path.mtk_wdma.bss;
-	info->wcid = path.mtk_wdma.wcid;
+	info->wdma_idx = path->mtk_wdma.wdma_idx;
+	info->queue = path->mtk_wdma.queue;
+	info->bss = path->mtk_wdma.bss;
+	info->wcid = path->mtk_wdma.wcid;
 
 	return 0;
 }
-- 
2.36.1