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xsk: Return error code if force_zc is set

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

Fixes: 921b68692a ("xsk: Enable sharing of dma mappings")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/1607077277-41995-1-git-send-email-zhangchangzhong@huawei.com
This commit is contained in:
Zhang Changzhong 2020-12-04 18:21:16 +08:00 committed by Daniel Borkmann
parent 3413f04141
commit 12c8a8ca11
1 changed files with 1 additions and 0 deletions
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1
net/xdp/xsk_buff_pool.c
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@ -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;