Commit 12c8a8ca authored by Zhang Changzhong's avatar Zhang Changzhong Committed by Daniel Borkmann
Browse files

xsk: Return error code if force_zc is set 



If force_zc is set, we should exit out with an error, not fall back to
copy mode.

Fixes: 921b6869 ("xsk: Enable sharing of dma mappings")
Reported-by: default avatarHulk Robot <hulkci@huawei.com>
Signed-off-by: default avatarZhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarMagnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/1607077277-41995-1-git-send-email-zhangchangzhong@huawei.com
parent 3413f041

net/xdp/xsk_buff_pool.c

+1 −0
Original line number Diff line number Diff line
@@ -175,6 +175,7 @@ static int __xp_assign_dev(struct xsk_buff_pool *pool, 


	if (!pool->dma_pages) {

		WARN(1, "Driver did not DMA map zero-copy buffers");

		err = -EINVAL;

		goto err_unreg_xsk;

	}

	pool->umem->zc = true;