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https://github.com/coolsnowwolf/lede.git
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146 lines
4.3 KiB
Diff
146 lines
4.3 KiB
Diff
From ee0b636607a8685dcac16b217ee49432de171cb0 Mon Sep 17 00:00:00 2001
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From: Xiaoping Fan <xfan@codeaurora.org>
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Date: Fri, 26 Feb 2016 15:01:53 -0800
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Subject: [PATCH 1/3] net: patch linux kernel to support shortcut-fe
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1, add a new flag 'fast_forwarded' in skb structure.
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2, put a hook in '__netif_receive_skb_core' to
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deliver packet to shortcut-fe.
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Change-Id: Icaa7c172a06df1c3bc89ff89814d1136772fe217
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Signed-off-by: Xiaoping Fan <xfan@codeaurora.org>
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msm: ipq806x: exporting TCP sequence check parameters
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This is for use in NSS connection manager.
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Change-Id: I01d30c0ab552308c439353c0d51d3d0ab3aa7699
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Signed-off-by: Pamidipati, Vijay <vpamidip@codeaurora.org>
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Signed-off-by: Murat Sezgin <msezgin@codeaurora.org>
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---
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include/linux/skbuff.h | 5 +++++
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net/Kconfig | 3 +++
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net/core/dev.c | 27 +++++++++++++++++++++++++++
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net/netfilter/nf_conntrack_proto_tcp.c | 10 ++++++++++
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4 files changed, 45 insertions(+)
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diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
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index a4b1aaa..f72eea2 100644
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--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -643,7 +643,12 @@ struct sk_buff {
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__u8 inner_protocol_type:1;
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__u8 remcsum_offload:1;
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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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+ /* 1 or 3 bit hole */
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+#else
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/* 2 or 4 bit hole */
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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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diff --git a/net/Kconfig b/net/Kconfig
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index 6dedbb5..e8c6e6c 100644
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--- a/net/Kconfig
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+++ b/net/Kconfig
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@@ -397,3 +397,6 @@ endif # if NET
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# Used by archs to tell that they support BPF_JIT
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config HAVE_BPF_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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diff --git a/net/core/dev.c b/net/core/dev.c
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index 11b9cda..3761691 100644
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -2732,8 +2732,17 @@ static int xmit_one(struct sk_buff *skb, struct net_device *dev,
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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 (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all))
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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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@@ -3825,6 +3834,11 @@ void netdev_rx_handler_unregister(struct net_device *dev)
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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 (*fast_nat_recv)(struct sk_buff *skb) __rcu __read_mostly;
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+EXPORT_SYMBOL_GPL(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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@@ -3867,6 +3881,9 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
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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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@@ -3893,6 +3910,16 @@ 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(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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#ifdef CONFIG_NET_CLS_ACT
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if (skb->tc_verd & TC_NCLS) {
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skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
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diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
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index d41fdab..6f3cdfd 100644
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--- a/net/netfilter/nf_conntrack_proto_tcp.c
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+++ b/net/netfilter/nf_conntrack_proto_tcp.c
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@@ -34,12 +34,22 @@
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#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
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/* Do not check the TCP window for incoming packets */
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+#ifdef CONFIG_SHORTCUT_FE
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+int nf_ct_tcp_no_window_check __read_mostly = 0;
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+EXPORT_SYMBOL_GPL(nf_ct_tcp_no_window_check);
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+#else
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static int nf_ct_tcp_no_window_check __read_mostly = 1;
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+#endif
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/* "Be conservative in what you do,
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be liberal in what you accept from others."
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If it's non-zero, we mark only out of window RST segments as INVALID. */
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+#ifdef CONFIG_SHORTCUT_FE
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+int nf_ct_tcp_be_liberal __read_mostly;
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+EXPORT_SYMBOL_GPL(nf_ct_tcp_be_liberal);
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+#else
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static int nf_ct_tcp_be_liberal __read_mostly = 0;
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+#endif
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/* If it is set to zero, we disable picking up already established
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connections. */
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--
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2.7.4
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