linux-toradex.git/net/ipv6/tcpv6_offload.c, branch v3.14.50

net-gre-gro: Fix a bug that breaks the forwarding path

2014-07-28T15:06:01+00:00

[ Upstream commit c3caf1192f904de2f1381211f564537235d50de3 ]

Fixed a bug that was introduced by my GRE-GRO patch
(bf5a755f5e9186406bbf50f4087100af5bd68e40 net-gre-gro: Add GRE
support to the GRO stack) that breaks the forwarding path
because various GSO related fields were not set. The bug will
cause on the egress path either the GSO code to fail, or a
GRE-TSO capable (NETIF_F_GSO_GRE) NICs to choke. The following
fix has been tested for both cases.

Signed-off-by: H.K. Jerry Chu 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

ipv6: gro: fix CHECKSUM_COMPLETE support

2014-05-31T20:20:39+00:00

[ Upstream commit 4de462ab63e23953fd05da511aeb460ae10cc726 ]

When GRE support was added in linux-3.14, CHECKSUM_COMPLETE handling
broke on GRE+IPv6 because we did not update/use the appropriate csum :

GRO layer is supposed to use/update NAPI_GRO_CB(skb)->csum instead of
skb->csum

Tested using a GRE tunnel and IPv6 traffic. GRO aggregation now happens
at the first level (ethernet device) instead of being done in gre
tunnel. Native IPv6+TCP is still properly aggregated.

Fixes: bf5a755f5e918 ("net-gre-gro: Add GRE support to the GRO stack")
Signed-off-by: Eric Dumazet 
Cc: Jerry Chu 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

net-gro: Prepare GRO stack for the upcoming tunneling support

2013-12-12T18:47:53+00:00

This patch modifies the GRO stack to avoid the use of "network_header"
and associated macros like ip_hdr() and ipv6_hdr() in order to allow
an arbitary number of IP hdrs (v4 or v6) to be used in the
encapsulation chain. This lays the foundation for various IP
tunneling support (IP-in-IP, GRE, VXLAN, SIT,...) to be added later.

With this patch, the GRO stack traversing now is mostly based on
skb_gro_offset rather than special hdr offsets saved in skb (e.g.,
skb->network_header). As a result all but the top layer (i.e., the
the transport layer) must have hdrs of the same length in order for
a pkt to be considered for aggregation. Therefore when adding a new
encap layer (e.g., for tunneling), one must check and skip flows
(e.g., by setting NAPI_GRO_CB(p)->same_flow to 0) that have a
different hdr length.

Note that unlike the network header, the transport header can and
will continue to be set by the GRO code since there will be at
most one "transport layer" in the encap chain.

Signed-off-by: H.K. Jerry Chu 
Suggested-by: Eric Dumazet 
Reviewed-by: Eric Dumazet 
Signed-off-by: David S. Miller

gro: Clean up tcpX_gro_receive checksum verification

2013-11-23T22:46:19+00:00

This patch simplifies the checksum verification in tcpX_gro_receive
by reusing the CHECKSUM_COMPLETE code for CHECKSUM_NONE.  All it
does for CHECKSUM_NONE is compute the partial checksum and then
treat it as if it came from the hardware (CHECKSUM_COMPLETE).

Signed-off-by: Herbert Xu 

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

gro: Only verify TCP checksums for candidates

2013-11-23T22:46:19+00:00

In some cases we may receive IP packets that are longer than
their stated lengths.  Such packets are never merged in GRO.
However, we may end up computing their checksums incorrectly
and end up allowing packets with a bogus checksum enter our
stack with the checksum status set as verified.

Since such packets are rare and not performance-critical, this
patch simply skips the checksum verification for them.

Reported-by: Alexander Duyck 
Signed-off-by: Herbert Xu 
Acked-by: Alexander Duyck 

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

tcp: rename tcp_tso_segment()

2013-10-18T17:38:39+00:00

Rename tcp_tso_segment() to tcp_gso_segment(), to better reflect
what is going on, and ease grep games.

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

net: Remove code duplication between offload structures

2012-11-15T22:39:51+00:00

Move the offload callbacks into its own structure.

Signed-off-by: Vlad Yasevich 
Signed-off-by: David S. Miller

ipv6: Pull IPv6 GSO registration out of the module

2012-11-15T22:39:24+00:00

Sing GSO support is now separate, pull it out of the module
and make it its own init call.
Remove the cleanup functions as they are no longer called.

Signed-off-by: Vlad Yasevich 
Signed-off-by: David S. Miller

ipv6: Separate tcp offload functionality

2012-11-15T22:36:18+00:00

Pull TCPv6 offload functionality into its won file in preparation
for moving it out of the module.

Signed-off-by: Vlad Yasevich 
Signed-off-by: David S. Miller