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SubjectRE: [PATCH net-next 17/22] hv_netvsc: fix return type of ndo_start_xmit function
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> -----Original Message-----
> From: YueHaibing <yuehaibing@huawei.com>
> Sent: Thursday, September 20, 2018 8:33 AM
> To: davem@davemloft.net; dmitry.tarnyagin@lockless.no;
> wg@grandegger.com; mkl@pengutronix.de; michal.simek@xilinx.com;
> hsweeten@visionengravers.com; madalin.bucur@nxp.com;
> pantelis.antoniou@gmail.com; claudiu.manoil@nxp.com; leoyang.li@nxp.com;
> linux@armlinux.org.uk; sammy@sammy.net; ralf@linux-mips.org;
> nico@fluxnic.net; steve.glendinning@shawell.net; f.fainelli@gmail.com;
> grygorii.strashko@ti.com; w-kwok2@ti.com; m-karicheri2@ti.com;
> t.sailer@alumni.ethz.ch; jreuter@yaina.de; KY Srinivasan <kys@microsoft.com>;
> Haiyang Zhang <haiyangz@microsoft.com>; wei.liu2@citrix.com;
> paul.durrant@citrix.com; arvid.brodin@alten.se; pshelar@ovn.org
> Cc: linux-kernel@vger.kernel.org; netdev@vger.kernel.org; linux-
> can@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linuxppc-
> dev@lists.ozlabs.org; linux-mips@linux-mips.org; linux-omap@vger.kernel.org;
> linux-hams@vger.kernel.org; devel@linuxdriverproject.org; linux-
> usb@vger.kernel.org; xen-devel@lists.xenproject.org; dev@openvswitch.org;
> YueHaibing <yuehaibing@huawei.com>
> 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@huawei.com>
> ---
> 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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