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xsk: Support allocations of large umems

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When registering a umem area that is sufficiently large (>1G on an
x86), kmalloc cannot be used to allocate one of the internal data
structures, as the size requested gets too large. Use kvmalloc instead
that falls back on vmalloc if the allocation is too large for kmalloc.

Also add accounting for this structure as it is triggered by a user
space action (the XDP_UMEM_REG setsockopt) and it is by far the
largest structure of kernel allocated memory in xsk.

Reported-by: Ryan Goodfellow <rgoodfel@isi.edu>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/bpf/1578995365-7050-1-git-send-email-magnus.karlsson@intel.com
This commit is contained in:
Magnus Karlsson 2020-01-14 10:49:25 +01:00 committed by Alexei Starovoitov
parent 0a29275b63
commit d3a56931f9
1 changed files with 4 additions and 3 deletions
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7
net/xdp/xdp_umem.c
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@ -249,7 +249,7 @@ static void xdp_umem_release(struct xdp_umem *umem)
xdp_umem_unmap_pages(umem);
xdp_umem_unpin_pages(umem);
kfree(umem->pages);
kvfree(umem->pages);
umem->pages = NULL;
xdp_umem_unaccount_pages(umem);
@ -409,7 +409,8 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
if (err)
goto out_account;
umem->pages = kcalloc(umem->npgs, sizeof(*umem->pages), GFP_KERNEL);
umem->pages = kvcalloc(umem->npgs, sizeof(*umem->pages),
GFP_KERNEL_ACCOUNT);
if (!umem->pages) {
err = -ENOMEM;
goto out_pin;
@ -419,7 +420,7 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
if (!err)
return 0;
kfree(umem->pages);
kvfree(umem->pages);
out_pin:
xdp_umem_unpin_pages(umem);