73 lines
2.1 KiB
Diff
73 lines
2.1 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Tue, 8 Nov 2022 15:03:15 +0100
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Subject: [PATCH] net: dsa: add support for DSA rx offloading via
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metadata dst
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If a metadata dst is present with the type METADATA_HW_PORT_MUX on a dsa cpu
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port netdev, assume that it carries the port number and that there is no DSA
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tag present in the skb data.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/core/flow_dissector.c
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+++ b/net/core/flow_dissector.c
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@@ -971,12 +971,14 @@ bool __skb_flow_dissect(const struct net
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#if IS_ENABLED(CONFIG_NET_DSA)
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if (unlikely(skb->dev && netdev_uses_dsa(skb->dev) &&
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proto == htons(ETH_P_XDSA))) {
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+ struct metadata_dst *md_dst = skb_metadata_dst(skb);
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const struct dsa_device_ops *ops;
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int offset = 0;
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ops = skb->dev->dsa_ptr->tag_ops;
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/* Only DSA header taggers break flow dissection */
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- if (ops->needed_headroom) {
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+ if (ops->needed_headroom &&
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+ (!md_dst || md_dst->type != METADATA_HW_PORT_MUX)) {
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if (ops->flow_dissect)
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ops->flow_dissect(skb, &proto, &offset);
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else
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--- a/net/dsa/dsa.c
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+++ b/net/dsa/dsa.c
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@@ -11,6 +11,7 @@
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#include <linux/netdevice.h>
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#include <linux/sysfs.h>
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#include <linux/ptp_classify.h>
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+#include <net/dst_metadata.h>
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#include "dsa_priv.h"
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@@ -216,6 +217,7 @@ static bool dsa_skb_defer_rx_timestamp(s
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static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *unused)
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{
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+ struct metadata_dst *md_dst = skb_metadata_dst(skb);
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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struct sk_buff *nskb = NULL;
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struct dsa_slave_priv *p;
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@@ -229,7 +231,22 @@ static int dsa_switch_rcv(struct sk_buff
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if (!skb)
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return 0;
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- nskb = cpu_dp->rcv(skb, dev);
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+ if (md_dst && md_dst->type == METADATA_HW_PORT_MUX) {
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+ unsigned int port = md_dst->u.port_info.port_id;
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+
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+ skb_dst_drop(skb);
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+ if (!skb_has_extensions(skb))
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+ skb->slow_gro = 0;
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+
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+ skb->dev = dsa_master_find_slave(dev, 0, port);
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+ if (likely(skb->dev)) {
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+ dsa_default_offload_fwd_mark(skb);
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+ nskb = skb;
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+ }
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+ } else {
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+ nskb = cpu_dp->rcv(skb, dev);
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+ }
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+
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if (!nskb) {
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kfree_skb(skb);
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return 0;
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