kernel/linux.git/include/linux/skbuff.h, branch v3.13-rc5

Revert "net: Handle CHECKSUM_COMPLETE more adequately in pskb_trim_rcsum()."

2013-12-02T22:26:05+00:00

This reverts commit 018c5bba052b3a383d83cf0c756da0e7bc748397. It causes regressions for people using chips driven by the sungem driver. Suspicion is that the skb->csum value isn't being adjusted properly. The change also has a bug in that if __pskb_trim() fails, we'll leave a corruped skb->csum value in there. We would really need to revert it to it's original value in that case. Signed-off-by: David S. Miller

net: Handle CHECKSUM_COMPLETE more adequately in pskb_trim_rcsum().

2013-11-16T02:11:16+00:00

Currently pskb_trim_rcsum() just balks on CHECKSUM_COMPLETE packets and remarks them as CHECKSUM_NONE, forcing a software checksum validation later. We have all of the mechanics available to fixup the skb->csum value, even for complicated fragmented packets, via the helpers skb_checksum() and csum_sub(). So just use them. Based upon a suggestion by Herbert Xu. Signed-off-by: David S. Miller

netfilter: push reasm skb through instead of original frag skbs

2013-11-11T05:19:35+00:00

Pushing original fragments through causes several problems. For example for matching, frags may not be matched correctly. Take following example: On HOSTA do: ip6tables -I INPUT -p icmpv6 -j DROP ip6tables -I INPUT -p icmpv6 -m icmp6 --icmpv6-type 128 -j ACCEPT and on HOSTB you do: ping6 HOSTA -s2000 (MTU is 1500) Incoming echo requests will be filtered out on HOSTA. This issue does not occur with smaller packets than MTU (where fragmentation does not happen) As was discussed previously, the only correct solution seems to be to use reassembled skb instead of separete frags. Doing this has positive side effects in reducing sk_buff by one pointer (nfct_reasm) and also the reams dances in ipvs and conntrack can be removed. Future plan is to remove net/ipv6/netfilter/nf_conntrack_reasm.c entirely and use code in net/ipv6/reassembly.c instead. Signed-off-by: Jiri Pirko Acked-by: Julian Anastasov Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller

net: skbuff - kernel-doc fixes

2013-11-08T00:28:59+00:00

Use "@" to refer to parameters in the kernel-doc description. According to Documentation/kernel-doc-nano-HOWTO.txt "&" shall be used to refer to structures only. Signed-off-by: Mathias Krause Cc: "David S. Miller" Signed-off-by: David S. Miller

net: move pskb_put() to core code

2013-11-08T00:28:58+00:00

This function has usage beside IPsec so move it to the core skbuff code. While doing so, give it some documentation and change its return type to 'unsigned char *' to be in line with skb_put(). Signed-off-by: Mathias Krause Cc: Steffen Klassert Cc: "David S. Miller" Cc: Herbert Xu Signed-off-by: David S. Miller

net: introduce skb_coalesce_rx_frag()

2013-11-05T01:03:52+00:00

Sometimes we need to coalesce the rx frags to avoid frag list. One example is virtio-net driver which tries to use small frags for both MTU sized packet and GSO packet. So this patch introduce skb_coalesce_rx_frag() to do this. Cc: Rusty Russell Cc: Michael S. Tsirkin Cc: Michael Dalton Cc: Eric Dumazet Acked-by: Michael S. Tsirkin Signed-off-by: Jason Wang Acked-by: Eric Dumazet Signed-off-by: David S. Miller

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

2013-11-04T04:04:57+00:00

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

ipv6: sit: add GSO/TSO support

2013-10-21T22:49:39+00:00

Now ipv6_gso_segment() is stackable, its relatively easy to implement GSO/TSO support for SIT tunnels Performance results, when segmentation is done after tunnel device (as no NIC is yet enabled for TSO SIT support) : Before patch : lpq84:~# ./netperf -H 2002:af6:1153:: -Cc MIGRATED TCP STREAM TEST from ::0 (::) port 0 AF_INET6 to 2002:af6:1153:: () port 0 AF_INET6 Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 10.00 3168.31 4.81 4.64 2.988 2.877 After patch : lpq84:~# ./netperf -H 2002:af6:1153:: -Cc MIGRATED TCP STREAM TEST from ::0 (::) port 0 AF_INET6 to 2002:af6:1153:: () port 0 AF_INET6 Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 10.00 5525.00 7.76 5.17 2.763 1.840 Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

ipip: add GSO/TSO support

2013-10-19T23:36:19+00:00

Now inet_gso_segment() is stackable, its relatively easy to implement GSO/TSO support for IPIP Performance results, when segmentation is done after tunnel device (as no NIC is yet enabled for TSO IPIP support) : Before patch : lpq83:~# ./netperf -H 7.7.9.84 -Cc MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.9.84 () port 0 AF_INET Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 10.00 3357.88 5.09 3.70 2.983 2.167 After patch : lpq83:~# ./netperf -H 7.7.9.84 -Cc MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.9.84 () port 0 AF_INET Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 10.00 7710.19 4.52 6.62 1.152 1.687 Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

ipv4: gso: make inet_gso_segment() stackable

2013-10-19T23:36:18+00:00

In order to support GSO on IPIP, we need to make inet_gso_segment() stackable. It should not assume network header starts right after mac header. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller