[PATCH net-next 02/12] net: pass net_device_path_ctx to dev_fill_forward_path()
flat view
STALE78d
REVIEWED: 1 (1M)
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2026-08-10 19:40:33
Also in:
netfilter-devel
Subsystem:
airoha ethernet driver, mediatek ethernet driver, netfilter, networking drivers, networking [general], the rest · Maintainers:
Lorenzo Bianconi, Felix Fietkau, Pablo Neira Ayuso, Florian Westphal, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Status: Reviewed.
1 review trailer (1 from subsystem maintainers).
From: Lorenzo Bianconi <redacted> Refactor dev_fill_forward_path() to take a struct net_device_path_ctx pointer instead of a (dev, daddr) pair, so the caller can build and populate the context up front and keep it after the forward path walk. This allows additional fields (e.g. vlan and ether_type) to be carried in the context and shared with ndo_fill_forward_path implementations, instead of being reconstructed on the stack inside the core helper. Update the mtk_ppe_offload, airoha_ppe and nf_flow_table_path callers to allocate and fill the context before invoking dev_fill_forward_path(). The network topology resolution behaviour is unchanged. This is a preliminary patch to enable HW flowtable offload for IPv4 over IPv6 tunnels. Signed-off-by: Lorenzo Bianconi <redacted> Reviewed-by: Simon Horman <horms@kernel.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- drivers/net/ethernet/airoha/airoha_ppe.c | 7 ++++++- .../net/ethernet/mediatek/mtk_ppe_offload.c | 7 ++++++- include/linux/netdevice.h | 2 +- net/core/dev.c | 18 +++++++----------- net/netfilter/nf_flow_table_path.c | 7 ++++++- 5 files changed, 26 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index a03af9750573..92611802801e 100644
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c@@ -283,14 +283,19 @@ static int airoha_ppe_get_wdma_info(struct net_device *dev, const u8 *addr, struct airoha_wdma_info *info) { struct net_device_path_stack stack; + struct net_device_path_ctx ctx = { + .dev = dev, + }; struct net_device_path *path; int err; if (!dev) return -ENODEV; + ether_addr_copy(ctx.daddr, addr); + rcu_read_lock(); - err = dev_fill_forward_path(dev, addr, &stack); + err = dev_fill_forward_path(&ctx, &stack); rcu_read_unlock(); if (err) return err;
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
index 771d9118f94a..99b28aaa7cc4 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c@@ -92,6 +92,9 @@ static int mtk_flow_get_wdma_info(struct net_device *dev, const u8 *addr, struct mtk_wdma_info *info) { struct net_device_path_stack stack; + struct net_device_path_ctx ctx = { + .dev = dev, + }; struct net_device_path *path; int err;
@@ -101,8 +104,10 @@ mtk_flow_get_wdma_info(struct net_device *dev, const u8 *addr, struct mtk_wdma_i if (!IS_ENABLED(CONFIG_NET_MEDIATEK_SOC_WED)) return -1; + ether_addr_copy(ctx.daddr, addr); + rcu_read_lock(); - err = dev_fill_forward_path(dev, addr, &stack); + err = dev_fill_forward_path(&ctx, &stack); rcu_read_unlock(); if (err) return err;
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index db9dce7f0aa6..17d28adb029b 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h@@ -3428,7 +3428,7 @@ void dev_remove_offload(struct packet_offload *po); int dev_get_iflink(const struct net_device *dev); int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb); -int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, +int dev_fill_forward_path(struct net_device_path_ctx *ctx, struct net_device_path_stack *stack); void dev_fill_forward_path_release(struct net_device_path_stack *stack); struct net_device *dev_get_by_name(struct net *net, const char *name);
diff --git a/net/core/dev.c b/net/core/dev.c
index fd0b445f5d38..1755dd0b2a92 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -769,35 +769,31 @@ void dev_fill_forward_path_release(struct net_device_path_stack *stack) } EXPORT_SYMBOL_GPL(dev_fill_forward_path_release); -int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, +int dev_fill_forward_path(struct net_device_path_ctx *ctx, struct net_device_path_stack *stack) { const struct net_device *last_dev; - struct net_device_path_ctx ctx = { - .dev = dev, - }; struct net_device_path *path; int ret = 0; - memcpy(ctx.daddr, daddr, sizeof(ctx.daddr)); stack->num_paths = 0; - while (ctx.dev && ctx.dev->netdev_ops->ndo_fill_forward_path) { - last_dev = ctx.dev; + while (ctx->dev && ctx->dev->netdev_ops->ndo_fill_forward_path) { + last_dev = ctx->dev; path = dev_fwd_path(stack); if (!path) goto err_out; memset(path, 0, sizeof(struct net_device_path)); - ret = ctx.dev->netdev_ops->ndo_fill_forward_path(&ctx, path); + ret = ctx->dev->netdev_ops->ndo_fill_forward_path(ctx, path); if (ret < 0) goto err_out; stack->num_paths++; - if (WARN_ON_ONCE(last_dev == ctx.dev)) + if (WARN_ON_ONCE(last_dev == ctx->dev)) goto err_out; } - if (!ctx.dev) + if (!ctx->dev) return ret; path = dev_fwd_path(stack);
@@ -805,7 +801,7 @@ int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, goto err_out; path->type = DEV_PATH_ETHERNET; - path->dev = ctx.dev; + path->dev = ctx->dev; stack->num_paths++; return 0;
diff --git a/net/netfilter/nf_flow_table_path.c b/net/netfilter/nf_flow_table_path.c
index 56219b02e122..0cbde535b8ba 100644
--- a/net/netfilter/nf_flow_table_path.c
+++ b/net/netfilter/nf_flow_table_path.c@@ -49,6 +49,9 @@ static int nft_dev_fill_forward_path(const struct dst_entry *dst_cache, { const void *daddr = &ct->tuplehash[!dir].tuple.src.u3; struct net_device *dev = dst_cache->dev; + struct net_device_path_ctx ctx = { + .dev = dev, + }; struct neighbour *n; u8 nud_state;
@@ -71,7 +74,9 @@ static int nft_dev_fill_forward_path(const struct dst_entry *dst_cache, return -1; out: - return dev_fill_forward_path(dev, ha, stack); + ether_addr_copy(ctx.daddr, ha); + + return dev_fill_forward_path(&ctx, stack); } struct nft_forward_info {
--
2.47.3