sock: skb_copy_ubufs support for compound pages

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Refine skb_copy_ubufs to support compound pages. With upcoming TCP
zerocopy sendmsg, such fragments may appear.

The existing code replaces each page one for one. Splitting each
compound page into an independent number of regular pages can result
in exceeding limit MAX_SKB_FRAGS if data is not exactly page aligned.

Instead, fill all destination pages but the last to PAGE_SIZE.
Split the existing alloc + copy loop into separate stages:
1. compute bytelength and minimum number of pages to store this.
2. allocate
3. copy, filling each page except the last to PAGE_SIZE bytes
4. update skb frag array

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Willem de Bruijn 2017-08-03 16:29:38 -04:00 • committed by David S. Miller

parent 98ba0bd550

commit 3ece782693

2 changed files with 45 additions and 17 deletions

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9

include/linux/skbuff.h

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53

net/core/skbuff.c

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