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@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
index 5d457bc..25dc3c3 100644 (file)
--- 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;
 }