From: Willem de Bruijn <will...@google.com>
1/4 is a small optimization follow-up to the earlier fix to skb_segment:
check skb state once per skb, instead of once per frag.
2/4 makes behavior more consistent between standard and zerocopy send:
set the PSH bit when hitting MAX_SKB_FRAGS. This helps GRO.
3/4 resolves a surprising inconsistency in notification:
because small packets were not stored in frags, they would not set
the copied error code over loopback. This change also optimizes
the path by removing copying and making tso_fragment cheaper.
4/4 follows-up to 3/4 by no longer allocated now unused memory.
this was actually already in RFC patches, but dropped as I pared
down the patch set during revisions.
Willem de Bruijn (4):
skbuff: in skb_segment, call zerocopy functions once per nskb
tcp: push full zerocopy packets
tcp: place all zerocopy payload in frags
tcp: do not allocate linear memory for zerocopy skbs
net/core/skbuff.c | 14 +++++++++-----
net/ipv4/tcp.c | 24 +++++++++++++++---------
2 files changed, 24 insertions(+), 14 deletions(-)
--
2.15.1.620.gb9897f4670-goog
