82 lines
2.0 KiB
Diff
82 lines
2.0 KiB
Diff
--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -825,6 +825,9 @@
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__u8 decrypted:1;
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#endif
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__u8 gro_skip:1;
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+#ifdef CONFIG_SHORTCUT_FE
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+ __u8 fast_forwarded:1;
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+#endif
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#ifdef CONFIG_NET_SCHED
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__u16 tc_index; /* traffic control index */
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#if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)
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int br_multicast_list_adjacent(struct net_device *dev,
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--- a/net/Kconfig
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+++ b/net/Kconfig
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@@ -473,3 +473,6 @@ config HAVE_CBPF_JIT
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# Extended BPF JIT (eBPF)
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config HAVE_EBPF_JIT
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bool
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+
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+config SHORTCUT_FE
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+ bool "Enables kernel network stack path for Shortcut Forwarding Engine
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -3192,8 +3192,17 @@ static int xmit_one(struct sk_buff *skb,
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unsigned int len;
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int rc;
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+#ifdef CONFIG_SHORTCUT_FE
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+ /* If this skb has been fast forwarded then we don't want it to
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+ * go to any taps (by definition we're trying to bypass them).
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+ */
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+ if (!skb->fast_forwarded) {
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+#endif
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if (dev_nit_active(dev))
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dev_queue_xmit_nit(skb, dev);
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+#ifdef CONFIG_SHORTCUT_FE
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+ }
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+#endif
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#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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if (!dev->eth_mangle_tx ||
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@@ -4684,6 +4693,11 @@ void netdev_rx_handler_unregister(struct
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}
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EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
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+#ifdef CONFIG_SHORTCUT_FE
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+int (*athrs_fast_nat_recv)(struct sk_buff *skb) __rcu __read_mostly;
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+EXPORT_SYMBOL_GPL(athrs_fast_nat_recv);
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+#endif
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+
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/*
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* Limit the use of PFMEMALLOC reserves to those protocols that implement
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* the special handling of PFMEMALLOC skbs.
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@@ -4733,6 +4747,9 @@ static int __netif_receive_skb_core(stru
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bool deliver_exact = false;
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int ret = NET_RX_DROP;
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__be16 type;
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+#ifdef CONFIG_SHORTCUT_FE
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+ int (*fast_recv)(struct sk_buff *skb);
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+#endif
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net_timestamp_check(!netdev_tstamp_prequeue, skb);
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@@ -4773,6 +4790,16 @@ another_round:
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goto out;
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}
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+#ifdef CONFIG_SHORTCUT_FE
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+ fast_recv = rcu_dereference(athrs_fast_nat_recv);
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+ if (fast_recv) {
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+ if (fast_recv(skb)) {
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+ ret = NET_RX_SUCCESS;
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+ goto out;
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+ }
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+ }
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+#endif
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+
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if (skb_skip_tc_classify(skb))
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goto skip_classify;
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