From: Magnus Karlsson Date: Tue, 14 Jan 2020 09:49:25 +0000 (+0100) Subject: xsk: Support allocations of large umems X-Git-Tag: v5.6-rc1~151^2~46^2~27 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=d3a56931f9c8644a52e7a6735954c84ea895e8c3;p=linux.git xsk: Support allocations of large umems 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 Signed-off-by: Magnus Karlsson Signed-off-by: Alexei Starovoitov Acked-by: Jonathan Lemon Link: https://lore.kernel.org/bpf/1578995365-7050-1-git-send-email-magnus.karlsson@intel.com --- diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c index 3049af269fbf..f93e917e0929 100644 --- a/net/xdp/xdp_umem.c +++ b/net/xdp/xdp_umem.c @@ -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);