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Commit 768608d5 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 582df5da

include/linux/skbuff.h

+4 −0
Original line number Diff line number Diff line
@@ -769,7 +769,11 @@ struct sk_buff { 
	__u8			ipvs_property:1;



	__u8			inner_protocol_type:1;

	__u8			fast_forwarded:1;

	__u8			remcsum_offload:1;



	 /*4 or 6 bit hole */



#ifdef CONFIG_NET_SWITCHDEV

	__u8			offload_fwd_mark:1;

#endif

include/net/netfilter/nf_conntrack.h

+2 −0
Original line number Diff line number Diff line
@@ -96,6 +96,8 @@ struct nf_conn { 
	/* Extensions */

	struct nf_ct_ext *ext;



	void *sfe_entry;



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

	union nf_conntrack_proto proto;

};

include/net/netfilter/nf_conntrack_core.h

+1 −0
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ bool nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, 
			const struct nf_conntrack_tuple *orig,

			const struct nf_conntrack_l3proto *l3proto,

			const struct nf_conntrack_l4proto *l4proto);

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



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

struct nf_conntrack_tuple_hash *

net/core/dev.c

+12 −1
Original line number Diff line number Diff line
@@ -4326,10 +4326,12 @@ static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, 
#endif /* CONFIG_NETFILTER_INGRESS */

	return 0;

}



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

EXPORT_SYMBOL(embms_tm_multicast_recv);



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

EXPORT_SYMBOL(athrs_fast_nat_recv);



static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)

{

	struct packet_type *ptype, *pt_prev;
@@ -4339,6 +4341,7 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) 
	int ret = NET_RX_DROP;

	__be16 type;

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

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



	net_timestamp_check(!netdev_tstamp_prequeue, skb);
@@ -4400,6 +4403,14 @@ static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc) 
		embms_recv(skb);



skip_classify:

	fast_recv = rcu_dereference(athrs_fast_nat_recv);

	if (fast_recv) {

		if (fast_recv(skb)) {

			ret = NET_RX_SUCCESS;

			goto out;

		}

	}



	if (pfmemalloc && !skb_pfmemalloc_protocol(skb))

		goto drop;

net/netfilter/nf_conntrack_core.c

+11 −0
Original line number Diff line number Diff line
@@ -406,11 +406,15 @@ void nf_ct_tmpl_free(struct nf_conn *tmpl) 
}

EXPORT_SYMBOL_GPL(nf_ct_tmpl_free);



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

EXPORT_SYMBOL(delete_sfe_entry);



static void

destroy_conntrack(struct nf_conntrack *nfct)

{

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

	const struct nf_conntrack_l4proto *l4proto;

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



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

	WARN_ON(atomic_read(&nfct->use) != 0);
@@ -419,6 +423,13 @@ destroy_conntrack(struct nf_conntrack *nfct) 
		nf_ct_tmpl_free(ct);

		return;

	}



	if (ct->sfe_entry) {

		delete_entry = rcu_dereference(delete_sfe_entry);

		if (delete_entry)

			delete_entry(ct);

	}



	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));

	if (l4proto->destroy)

		l4proto->destroy(ct);