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net: micro-optimize skb_datagram_iter

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We only use the mapping in a single context in a short and contained scope,
so kmap_local_page is sufficient and cheaper. This will also allow
skb_datagram_iter to be called from softirq context.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Link: https://lore.kernel.org/r/20240613113504.1079860-1-sagi@grimberg.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sagi Grimberg 2024-06-13 14:35:04 +03:00 committed by Jakub Kicinski
parent abef84957b
commit 934c29999b
1 changed files with 2 additions and 2 deletions
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4
net/core/datagram.c
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@ -417,14 +417,14 @@ static int __skb_datagram_iter(const struct sk_buff *skb, int offset,
end = start + skb_frag_size(frag);
if ((copy = end - offset) > 0) {
struct page *page = skb_frag_page(frag);
u8 *vaddr = kmap(page);
u8 *vaddr = kmap_local_page(page);
if (copy > len)
copy = len;
n = INDIRECT_CALL_1(cb, simple_copy_to_iter,
vaddr + skb_frag_off(frag) + offset - start,
copy, data, to);
kunmap(page);
kunmap_local(vaddr);
offset += n;
if (n != copy)
goto short_copy;