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net: introduce helper sendpages_ok()

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Network drivers are using sendpage_ok() to check the first page of an
iterator in order to disable MSG_SPLICE_PAGES. The iterator can
represent list of contiguous pages.

When MSG_SPLICE_PAGES is enabled skb_splice_from_iter() is being used,
it requires all pages in the iterator to be sendable. Therefore it needs
to check that each page is sendable.

The patch introduces a helper sendpages_ok(), it returns true if all the
contiguous pages are sendable.

Drivers who want to send contiguous pages with MSG_SPLICE_PAGES may use
this helper to check whether the page list is OK. If the helper does not
return true, the driver should remove MSG_SPLICE_PAGES flag.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Ofir Gal <ofir.gal@volumez.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20240718084515.3833733-2-ofir.gal@volumez.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ofir Gal 2024-07-18 11:45:12 +03:00 committed by Jens Axboe
parent 79c6c60a6c
commit 23a55f4492
1 changed files with 19 additions and 0 deletions
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19
include/linux/net.h
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@ -322,6 +322,25 @@ static inline bool sendpage_ok(struct page *page)
return !PageSlab(page) && page_count(page) >= 1;
}
/*
* Check sendpage_ok on contiguous pages.
*/
static inline bool sendpages_ok(struct page *page, size_t len, size_t offset)
{
struct page *p = page + (offset >> PAGE_SHIFT);
size_t count = 0;
while (count < len) {
if (!sendpage_ok(p))
return false;
p++;
count += PAGE_SIZE;
}
return true;
}
int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
size_t num, size_t len);
int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,