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ip, udp: Support MSG_SPLICE_PAGES

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Make IP/UDP sendmsg() support MSG_SPLICE_PAGES.  This causes pages to be
spliced from the source iterator.

This allows ->sendpage() to be replaced by something that can handle
multiple multipage folios in a single transaction.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
cc: David Ahern <dsahern@kernel.org>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
David Howells 2023-05-22 13:11:20 +01:00 committed by Jakub Kicinski
parent 5367f9bbb8
commit 7da0dde684
1 changed files with 17 additions and 0 deletions
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17
net/ipv4/ip_output.c
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@ -1048,6 +1048,14 @@ static int __ip_append_data(struct sock *sk,
skb_zcopy_set(skb, uarg, &extra_uref);
}
}
} else if ((flags & MSG_SPLICE_PAGES) && length) {
if (inet->hdrincl)
return -EPERM;
if (rt->dst.dev->features & NETIF_F_SG)
/* We need an empty buffer to attach stuff to */
paged = true;
else
flags &= ~MSG_SPLICE_PAGES;
}
cork->length += length;
@ -1207,6 +1215,15 @@ static int __ip_append_data(struct sock *sk,
err = -EFAULT;
goto error;
}
} else if (flags & MSG_SPLICE_PAGES) {
struct msghdr *msg = from;
err = skb_splice_from_iter(skb, &msg->msg_iter, copy,
sk->sk_allocation);
if (err < 0)
goto error;
copy = err;
wmem_alloc_delta += copy;
} else if (!zc) {
int i = skb_shinfo(skb)->nr_frags;