linux-toradex.git/include/net/ip6_fib.h, branch v4.2.3

ipv6: Create percpu rt6_info

2015-05-25T17:25:35+00:00

After the patch
'ipv6: Only create RTF_CACHE routes after encountering pmtu exception',
we need to compensate the performance hit (bouncing dst->__refcnt).

Signed-off-by: Martin KaFai Lau 
Cc: Hannes Frederic Sowa 
Cc: Steffen Klassert 
Cc: Julian Anastasov 
Signed-off-by: David S. Miller

ipv6: Keep track of DST_NOCACHE routes in case of iface down/unregister

2015-05-25T17:25:34+00:00

This patch keeps track of the DST_NOCACHE routes in a list and replaces its
dev with loopback during the iface down/unregister event.

Signed-off-by: Martin KaFai Lau 
Cc: Hannes Frederic Sowa 
Cc: Steffen Klassert 
Cc: Julian Anastasov 
Signed-off-by: David S. Miller

ipv6: Create RTF_CACHE clone when FLOWI_FLAG_KNOWN_NH is set

2015-05-25T17:25:34+00:00

This patch always creates RTF_CACHE clone with DST_NOCACHE
when FLOWI_FLAG_KNOWN_NH is set so that the rt6i_dst is set to
the fl6->daddr.

Signed-off-by: Martin KaFai Lau 
Acked-by: Julian Anastasov 
Tested-by: Julian Anastasov 
Cc: Hannes Frederic Sowa 
Cc: Steffen Klassert 
Signed-off-by: David S. Miller

ipv6: Add rt6_get_cookie() function

2015-05-25T17:25:34+00:00

Instead of doing the rt6->rt6i_node check whenever we need
to get the route's cookie.  Refactor it into rt6_get_cookie().
It is a prep work to handle FLOWI_FLAG_KNOWN_NH and also
percpu rt6_info later.

Signed-off-by: Martin KaFai Lau 
Cc: Hannes Frederic Sowa 
Cc: Steffen Klassert 
Cc: Julian Anastasov 
Signed-off-by: David S. Miller

ipv6: Remove DST_METRICS_FORCE_OVERWRITE and _rt6i_peer

2015-05-02T00:57:06+00:00

_rt6i_peer is no longer needed after the last patch,
'ipv6: Stop rt6_info from using inet_peer's metrics'.

DST_METRICS_FORCE_OVERWRITE is added by
commit e5fd387ad5b3 ("ipv6: do not overwrite inetpeer metrics prematurely").
Since inetpeer is no longer used for metrics, this bit is also not needed.

Signed-off-by: Martin KaFai Lau 
Reviewed-by: Hannes Frederic Sowa 
Cc: Michal Kubeček 
Cc: Steffen Klassert 
Signed-off-by: David S. Miller

ipv6: Stop rt6_info from using inet_peer's metrics

2015-05-02T00:57:06+00:00

inet_peer is indexed by the dst address alone.  However, the fib6 tree
could have multiple routing entries (rt6_info) for the same dst. For
example,
1. A /128 dst via multiple gateways.
2. A RTF_CACHE route cloned from a /128 route.

In the above cases, all of them will share the same metrics and
step on each other.

This patch will steer away from inet_peer's metrics and use
dst_cow_metrics_generic() for everything.

Change Highlights:
1. Remove rt6_cow_metrics() which currently acquires metrics from
   inet_peer for DST_HOST route (i.e. /128 route).
2. Add rt6i_pmtu to take care of the pmtu update to avoid creating a
   full size metrics just to override the RTAX_MTU.
3. After (2), the RTF_CACHE route can also share the metrics with its
   dst.from route, by:
   dst_init_metrics(&cache_rt->dst, dst_metrics_ptr(cache_rt->dst.from), true);
4. Stop creating RTF_CACHE route by cloning another RTF_CACHE route.  Instead,
   directly clone from rt->dst.

   [ Currently, cloning from another RTF_CACHE is only possible during
     rt6_do_redirect().  Also, the old clone is removed from the tree
     immediately after the new clone is added. ]

   In case of cloning from an older redirect RTF_CACHE, it should work as
   before.

   In case of cloning from an older pmtu RTF_CACHE, this patch will forget
   the pmtu and re-learn it (if there is any) from the redirected route.

The _rt6i_peer and DST_METRICS_FORCE_OVERWRITE will be removed
in the next cleanup patch.

Signed-off-by: Martin KaFai Lau 
Reviewed-by: Hannes Frederic Sowa 
Cc: Steffen Klassert 
Signed-off-by: David S. Miller

net: fib6: convert cfg metric to u32 outside of table write lock

2015-01-06T03:55:24+00:00

Do the nla validation earlier, outside the write lock.

This is needed by followup patch which needs to be able to call
request_module (which can sleep) if needed.

Joint work with Daniel Borkmann.

Signed-off-by: Daniel Borkmann 
Signed-off-by: Florian Westphal 
Signed-off-by: David S. Miller

ipv6: make rt_sernum atomic and serial number fields ordinary ints

2014-10-07T04:02:30+00:00

Cc: YOSHIFUJI Hideaki 
Cc: Martin Lau 
Signed-off-by: Hannes Frederic Sowa 
Signed-off-by: David S. Miller

ipv6: minor fib6 cleanups like type safety, bool conversion, inline removal

2014-10-07T04:02:30+00:00

Also renamed struct fib6_walker_t to fib6_walker and enum fib_walk_state_t
to fib6_walk_state as recommended by Cong Wang.

Cc: Cong Wang 
Cc: YOSHIFUJI Hideaki 
Cc: Martin Lau 
Signed-off-by: Hannes Frederic Sowa 
Signed-off-by: David S. Miller

ipv6: remove rt6i_genid

2014-09-30T18:00:48+00:00

Eric Dumazet noticed that all no-nonexthop or no-gateway routes which
are already marked DST_HOST (e.g. input routes routes) will always be
invalidated during sk_dst_check. Thus per-socket dst caching absolutely
had no effect and early demuxing had no effect.

Thus this patch removes rt6i_genid: fn_sernum already gets modified during
add operations, so we only must ensure we mutate fn_sernum during ipv6
address remove operations. This is a fairly cost extensive operations,
but address removal should not happen that often. Also our mtu update
functions do the same and we heard no complains so far. xfrm policy
changes also cause a call into fib6_flush_trees. Also plug a hole in
rt6_info (no cacheline changes).

I verified via tracing that this change has effect.

Cc: Eric Dumazet 
Cc: YOSHIFUJI Hideaki 
Cc: Vlad Yasevich 
Cc: Nicolas Dichtel 
Cc: Martin Lau 
Signed-off-by: Hannes Frederic Sowa 
Signed-off-by: David S. Miller