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xsk: Use kvcalloc to support large umems 

Use kvcalloc() instead of kcalloc() to support large umems with, on my
server, one million pages or more in the umem.

Reported-by: Dan Siemon <dan@coverfire.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Björn Töpel <bjorn@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210521083301.26921-1-magnus.karlsson@gmail.com
This commit is contained in:
Magnus Karlsson 2021-05-21 10:33:01 +02:00 committed by Daniel Borkmann
parent 8fb33b6055
commit a720a2a0ad
1 changed files with 3 additions and 4 deletions
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7
net/xdp/xdp_umem.c
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@ -27,7 +27,7 @@ static void xdp_umem_unpin_pages(struct xdp_umem *umem)
{
unpin_user_pages_dirty_lock(umem->pgs, umem->npgs, true);
kfree(umem->pgs);
kvfree(umem->pgs);
umem->pgs = NULL;
}
@ -99,8 +99,7 @@ static int xdp_umem_pin_pages(struct xdp_umem *umem, unsigned long address)
long npgs;
int err;
umem->pgs = kcalloc(umem->npgs, sizeof(*umem->pgs),
GFP_KERNEL | __GFP_NOWARN);
umem->pgs = kvcalloc(umem->npgs, sizeof(*umem->pgs), GFP_KERNEL | __GFP_NOWARN);
if (!umem->pgs)
return -ENOMEM;
@ -123,7 +122,7 @@ static int xdp_umem_pin_pages(struct xdp_umem *umem, unsigned long address)
out_pin:
xdp_umem_unpin_pages(umem);
out_pgs:
kfree(umem->pgs);
kvfree(umem->pgs);
umem->pgs = NULL;
return err;
}