kernel/include/net/checksum.h, branch linux-3.17.y

net: Allow csum_add to be provided in arch

2014-05-05T19:26:29Z

csum_add is really nothing more then add-with-carry which can be implemented efficiently in some architectures. Allow architecture to define this protected by HAVE_ARCH_CSUM_ADD. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller

net: optimize csum_replace2()

2014-03-24T04:18:44Z

When changing one 16bit value by another in IP header, we can adjust the IP checksum by doing a simple operation described in RFC 1624, as reminded by David. csum_partial() is a complex function on x86_64, not really suited for small number of checksummed bytes. I spotted csum_partial() being in the top 20 most consuming functions (more than 1 %) in a GRO workload, which was rather unexpected. The caller was inet_gro_complete() doing a csum_replace2() when building the new IP header for the GRO packet. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

net: checksum: fix warning in skb_checksum

2013-11-04T20:27:08Z

This patch fixes a build warning in skb_checksum() by wrapping the csum_partial() usage in skb_checksum(). The problem is that on a few architectures, csum_partial is used with prefix asmlinkage whereas on most architectures it's not. So fix this up generically as we did with csum_block_add_ext() to match the signature. Introduced by 2817a336d4d ("net: skb_checksum: allow custom update/combine for walking skb"). Reported-by: Fengguang Wu Signed-off-by: Daniel Borkmann Signed-off-by: David S. Miller

net: skb_checksum: allow custom update/combine for walking skb

2013-11-04T04:04:57Z

Currently, skb_checksum walks over 1) linearized, 2) frags[], and 3) frag_list data and calculats the one's complement, a 32 bit result suitable for feeding into itself or csum_tcpudp_magic(), but unsuitable for SCTP as we're calculating CRC32c there. Hence, in order to not re-implement the very same function in SCTP (and maybe other protocols) over and over again, use an update() + combine() callback internally to allow for walking over the skb with different algorithms. Signed-off-by: Daniel Borkmann Signed-off-by: David S. Miller

checksum: Remove extern from function prototypes

2013-08-01T00:50:02Z

There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches Signed-off-by: David S. Miller

net: core: add function for incremental IPv6 pseudo header checksum updates

2012-08-30T01:00:16Z

Add inet_proto_csum_replace16 for incrementally updating IPv6 pseudo header checksums for IPv6 NAT. Signed-off-by: Patrick McHardy Acked-by: David S. Miller

include/net net/ - csum_partial - remove unnecessary casts

2008-11-19T23:44:53Z

The first argument to csum_partial is const void * casts to char/u8 * are not necessary Signed-off-by: Joe Perches Signed-off-by: David S. Miller

[NET]: Move netfilter checksum helpers to net/core/utils.c

2008-01-28T22:55:14Z

This allows to get rid of the CONFIG_NETFILTER dependency of NET_ACT_NAT. This patch redefines the old names to keep the noise low, the next patch converts all users. Signed-off-by: Patrick McHardy Signed-off-by: Herbert Xu Signed-off-by: David S. Miller

[NET]: Make mangling a checksum (0 -> 0xffff on the wire) explicit.

2006-12-03T05:23:39Z

Signed-off-by: Al Viro Signed-off-by: David S. Miller

[NET]: Generic checksum annotations and cleanups.

2006-12-03T05:23:25Z

Signed-off-by: Al Viro Signed-off-by: David S. Miller