linux-toradex.git/include/net/ip.h, branch v3.1.1

ipv4: Add ip_defrag() agent IP_DEFRAG_AF_PACKET.

2011-07-06T05:34:52+00:00

Elide the ICMP on frag queue timeouts unconditionally for
this user.

Signed-off-by: David S. Miller

net: Fix build failures due to ip_is_fragment()

2011-06-24T04:28:52+00:00

It needs to be available even when CONFIG_INET is not set.

Reported-by: Stephen Rothwell 
Reported-by: Randy Dunlap 
Signed-off-by: David S. Miller

ip: introduce ip_is_fragment helper inline function

2011-06-22T03:33:34+00:00

There are enough instances of this:

    iph->frag_off & htons(IP_MF | IP_OFFSET)

that a helper function is probably warranted.

Signed-off-by: Paul Gortmaker 
Signed-off-by: David S. Miller

inetpeer: remove unused list

2011-06-09T00:05:30+00:00

Andi Kleen and Tim Chen reported huge contention on inetpeer
unused_peers.lock, on memcached workload on a 40 core machine, with
disabled route cache.

It appears we constantly flip peers refcnt between 0 and 1 values, and
we must insert/remove peers from unused_peers.list, holding a contended
spinlock.

Remove this list completely and perform a garbage collection on-the-fly,
at lookup time, using the expired nodes we met during the tree
traversal.

This removes a lot of code, makes locking more standard, and obsoletes
two sysctls (inet_peer_gc_mintime and inet_peer_gc_maxtime). This also
removes two pointers in inet_peer structure.

There is still a false sharing effect because refcnt is in first cache
line of object [were the links and keys used by lookups are located], we
might move it at the end of inet_peer structure to let this first cache
line mostly read by cpus.

Signed-off-by: Eric Dumazet 
CC: Andi Kleen 
CC: Tim Chen 
Signed-off-by: David S. Miller

ipv4: Pass explicit daddr arg to ip_send_reply().

2011-05-10T20:32:46+00:00

This eliminates an access to rt->rt_src.

Signed-off-by: David S. Miller

ipv4: Pass flow key down into ip_append_*().

2011-05-09T04:24:07+00:00

This way rt->rt_dst accesses are unnecessary.

Signed-off-by: David S. Miller

ipv4: Pass flow keys down into datagram packet building engine.

2011-05-09T04:24:06+00:00

This way ip_output.c no longer needs rt->rt_{src,dst}.

We already have these keys sitting, ready and waiting, on the stack or
in a socket structure.

Signed-off-by: David S. Miller

inet: Pass flowi to ->queue_xmit().

2011-05-08T22:28:28+00:00

This allows us to acquire the exact route keying information from the
protocol, however that might be managed.

It handles all of the possibilities, from the simplest case of storing
the key in inet->cork.fl to the more complex setup SCTP has where
individual transports determine the flow.

Signed-off-by: David S. Miller

inet: Decrease overhead of on-stack inet_cork.

2011-05-06T22:37:57+00:00

When we fast path datagram sends to avoid locking by putting
the inet_cork on the stack we use up lots of space that isn't
necessary.

This is because inet_cork contains a "struct flowi" which isn't
used in these code paths.

Split inet_cork to two parts, "inet_cork" and "inet_cork_full".
Only the latter of which has the "struct flowi" and is what is
stored in inet_sock.

Signed-off-by: David S. Miller 
Acked-by: Eric Dumazet

inet: add RCU protection to inet->opt

2011-04-28T20:16:35+00:00

We lack proper synchronization to manipulate inet->opt ip_options

Problem is ip_make_skb() calls ip_setup_cork() and
ip_setup_cork() possibly makes a copy of ipc->opt (struct ip_options),
without any protection against another thread manipulating inet->opt.

Another thread can change inet->opt pointer and free old one under us.

Use RCU to protect inet->opt (changed to inet->inet_opt).

Instead of handling atomic refcounts, just copy ip_options when
necessary, to avoid cache line dirtying.

We cant insert an rcu_head in struct ip_options since its included in
skb->cb[], so this patch is large because I had to introduce a new
ip_options_rcu structure.

Signed-off-by: Eric Dumazet 
Cc: Herbert Xu 
Signed-off-by: David S. Miller