On Wed, 26 Sep 2018 18:25:10 +0800
YueHaibing <yuehaibing@xxxxxxxxxx> wrote:
> The method ndo_start_xmit() is defined as returning an 'netdev_tx_t',
> which is a typedef for an enum type, so make sure the implementation in
> this driver has returns 'netdev_tx_t' value, and change the function
> return type to netdev_tx_t.
>
> As suggestion from Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, if netvsc_vf_xmit
> fails, We are not sure if the error can go away after retrying, returning
> NETDEV_TX_BUSY may cause infinite retry from the upper layer.
> so just return NETDEV_TX_OK at there.
>
> Found by coccinelle.
>
> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
> ---
> drivers/net/hyperv/netvsc_drv.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
> index ec69974..a1d44b4 100644
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -511,7 +511,8 @@ static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
> return rc;
> }
>
> -static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
> +static netdev_tx_t
> +netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
> {
> struct net_device_context *net_device_ctx = netdev_priv(net);
> struct hv_netvsc_packet *packet = NULL;
> @@ -528,8 +529,10 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
> */
> vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
> if (vf_netdev && netif_running(vf_netdev) &&
> - !netpoll_tx_running(net))
> - return netvsc_vf_xmit(net, vf_netdev, skb);
> + !netpoll_tx_running(net)) {
> + netvsc_vf_xmit(net, vf_netdev, skb);
> + return NETDEV_TX_OK;
> + }
>
> /* We will atmost need two pages to describe the rndis
> * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
Your patch loses the possible return values of netvsc_vf_xmit.
A suggested better fix would be to make netvsc_vf_xmit return netdev_tx_t type.
And this means the return value of dev_queue_xmit needs to be netdev_tx_t.
Please don't merge this as is.
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