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Commit 5b72559c authored by Mohammed Javid's avatar Mohammed Javid Committed by Gerrit - the friendly Code Review server
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net: Changes to support Shortcut Forward Engine 



Shortcut forward Engine (SFE) is a software packet accelerator
which works on packet tuple entires (SFE entry) based on
conntrack information.

net:core has changes to invoke SFE module during packet traversal.
net:netfilter has changes to remove SFE Entries when conntrack is
deleted or expires. Also has changes to avoid tcp window check for
incoming packets.

Change-Id: I1622677e472870f8100c72221d9b1fab7fa768be
Signed-off-by: default avatarMohammed Javid <mjavid@codeaurora.org>
parent 4fc723f7

include/linux/skbuff.h

+4 −0
Original line number Diff line number Diff line
@@ -811,6 +811,10 @@ struct sk_buff { 


	__u8			ipvs_property:1;

	__u8			inner_protocol_type:1;



#ifdef CONFIG_ENABLE_SFE

	__u8			fast_forwarded:1;

#endif

	__u8			remcsum_offload:1;

#ifdef CONFIG_NET_SWITCHDEV

	__u8			offload_fwd_mark:1;

include/net/netfilter/nf_conntrack.h

+4 −0
Original line number Diff line number Diff line
@@ -112,6 +112,10 @@ struct nf_conn { 
	unsigned long nattype_entry;

#endif



#ifdef CONFIG_ENABLE_SFE

	void *sfe_entry;

#endif



	/* Storage reserved for other modules, must be the last member */

	union nf_conntrack_proto proto;

};

include/net/netfilter/nf_conntrack_core.h

+6 −0
Original line number Diff line number Diff line
@@ -43,11 +43,17 @@ void nf_conntrack_cleanup_end(void); 


bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse,

			const struct nf_conntrack_tuple *orig);



extern bool (*nattype_refresh_timer)

			(unsigned long nattype,

			unsigned long timeout_value)

			__rcu __read_mostly;





#ifdef CONFIG_ENABLE_SFE

extern void (*delete_sfe_entry)(struct nf_conn *ct);

#endif



/* Find a connection corresponding to a tuple. */

struct nf_conntrack_tuple_hash *

nf_conntrack_find_get(struct net *net,

net/core/dev.c

+18 −0
Original line number Diff line number Diff line
@@ -4730,6 +4730,11 @@ void process_embms_receive_skb(struct sk_buff *skb) 
		embms_recv(skb);

}



#ifdef CONFIG_ENABLE_SFE

int (*athrs_fast_nat_recv)(struct sk_buff *skb) __rcu __read_mostly;

EXPORT_SYMBOL(athrs_fast_nat_recv);

#endif



static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,

				    struct packet_type **ppt_prev)

{
@@ -4740,6 +4745,9 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, 
	bool deliver_exact = false;

	int ret = NET_RX_DROP;

	__be16 type;

#ifdef CONFIG_ENABLE_SFE

	int (*fast_recv)(struct sk_buff *skb);

#endif



	net_timestamp_check(!netdev_tstamp_prequeue, skb);
@@ -4813,6 +4821,16 @@ static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, 
	process_embms_receive_skb(skb);



skip_classify:

#ifdef CONFIG_ENABLE_SFE

	fast_recv = rcu_dereference(athrs_fast_nat_recv);

	if (fast_recv) {

		if (fast_recv(skb)) {

			ret = NET_RX_SUCCESS;

			goto out;

		}

	}

#endif



	if (pfmemalloc && !skb_pfmemalloc_protocol(skb))

		goto drop;

net/netfilter/nf_conntrack_core.c

+16 −0
Original line number Diff line number Diff line
@@ -598,10 +598,18 @@ static void destroy_gre_conntrack(struct nf_conn *ct) 
#endif

}



#ifdef CONFIG_ENABLE_SFE

void (*delete_sfe_entry)(struct nf_conn *ct) __rcu __read_mostly;

EXPORT_SYMBOL(delete_sfe_entry);

#endif



static void

destroy_conntrack(struct nf_conntrack *nfct)

{

	struct nf_conn *ct = (struct nf_conn *)nfct;

#ifdef CONFIG_ENABLE_SFE

	void (*delete_entry)(struct nf_conn *ct);

#endif



	pr_debug("destroy_conntrack(%p)\n", ct);

	WARN_ON(atomic_read(&nfct->use) != 0);
@@ -614,6 +622,14 @@ destroy_conntrack(struct nf_conntrack *nfct) 
	if (unlikely(nf_ct_protonum(ct) == IPPROTO_GRE))

		destroy_gre_conntrack(ct);



#ifdef CONFIG_ENABLE_SFE

	if (ct->sfe_entry) {

		delete_entry = rcu_dereference(delete_sfe_entry);

		if (delete_entry)

			delete_entry(ct);

	}

#endif



	local_bh_disable();

	/* Expectations will have been removed in clean_from_lists,

	 * except TFTP can create an expectation on the first packet,