> -----Original Message-----
> From: YueHaibing <yuehaibing@xxxxxxxxxx>
> Sent: Thursday, September 20, 2018 8:33 AM
> To: davem@xxxxxxxxxxxxx; dmitry.tarnyagin@xxxxxxxxxxx;
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> Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>; wei.liu2@xxxxxxxxxx;
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> YueHaibing <yuehaibing@xxxxxxxxxx>
> Subject: [PATCH net-next 17/22] hv_netvsc: fix return type of ndo_start_xmit
> function
>
> 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.
>
> Found by coccinelle.
>
> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
> ---
> drivers/net/hyperv/netvsc_drv.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
> index 3af6d8d..056c472 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 +529,11 @@
> 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)) {
> + ret = netvsc_vf_xmit(net, vf_netdev, skb);
> + if (ret)
> + return NETDEV_TX_BUSY;
For error case, please just return NETDEV_TX_OK. We are not sure if the
error can go away after retrying, returning NETDEV_TX_BUSY may cause
infinite retry from the upper layer.
Thanks,
- Haiyang
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