[PATCH net v2] xsk: Return error code if force_zc is set

[PATCH net v2] xsk: Return error code if force_zc is set

[Zhang Changzhong]

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

Fixes: 921b68692abb ("xsk: Enable sharing of dma mappings")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
---
 net/xdp/xsk_buff_pool.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 9287edd..d5adeee 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -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;
-- 
2.9.5

Re: [PATCH net v2] xsk: Return error code if force_zc is set

[Magnus Karlsson]

On Fri, Dec 4, 2020 at 11:18 AM Zhang Changzhong
<zhangchangzhong@huawei.com> wrote:
>
> If force_zc is set, we should exit out with an error, not fall back to
> copy mode.
>
> Fixes: 921b68692abb ("xsk: Enable sharing of dma mappings")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
> ---
>  net/xdp/xsk_buff_pool.c | 1 +
>  1 file changed, 1 insertion(+)

Thank you Changzhong!

Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>

> diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
> index 9287edd..d5adeee 100644
> --- a/net/xdp/xsk_buff_pool.c
> +++ b/net/xdp/xsk_buff_pool.c
> @@ -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;
> --
> 2.9.5
>

Re: [PATCH net v2] xsk: Return error code if force_zc is set

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf.git (refs/heads/master):

On Fri, 4 Dec 2020 18:21:16 +0800 you wrote:
> If force_zc is set, we should exit out with an error, not fall back to
> copy mode.
> 
> Fixes: 921b68692abb ("xsk: Enable sharing of dma mappings")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
> 
> [...]

Here is the summary with links:
  - [net,v2] xsk: Return error code if force_zc is set
    https://git.kernel.org/bpf/bpf/c/12c8a8ca117f

You are awesome, thank you!
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