diff options
author | David S. Miller <davem@davemloft.net> | 2005-07-05 15:17:25 -0700 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2005-07-05 15:17:25 -0700 |
commit | c65f7f00c587828e3d50737805a78f74804972de (patch) | |
tree | 160f85e7d9ec1df2432b4dd3fae315812558bd10 /arch/s390 | |
parent | b8259d9ad1d0f8d0c5ea0e37bb15080b0bd395b5 (diff) |
[TCP]: Simplify SKB data portion allocation with NETIF_F_SG.
The ideal and most optimal layout for an SKB when doing
scatter-gather is to put all the headers at skb->data, and
all the user data in the page array.
This makes SKB splitting and combining extremely simple,
especially before a packet goes onto the wire the first
time.
So, when sk_stream_alloc_pskb() is given a zero size, make
sure there is no skb_tailroom(). This is achieved by applying
SKB_DATA_ALIGN() to the header length used here.
Next, make select_size() in TCP output segmentation use a
length of zero when NETIF_F_SG is true on the outgoing
interface.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/s390')
0 files changed, 0 insertions, 0 deletions