netdev - Re: [PATCH net-next] net: rmnet: set NETIF_F

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Date:   Sun, 08 Mar 2020 18:28:11 -0600
From:   subashab@...eaurora.org
To:     Taehee Yoo <ap420073@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, stranche@...eaurora.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: rmnet: set NETIF_F_LLTX flag

On 2020-03-08 07:47, Taehee Yoo wrote:
> The rmnet_vnd_setup(), which is the callback of ->ndo_start_xmit() is
> allowed to call concurrently because it uses RCU protected data.
> So, it doesn't need tx lock.
> 
> Signed-off-by: Taehee Yoo <ap420073@...il.com>
> ---
>  drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
> b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
> index d7c52e398e4a..d58b51d277f1 100644
> --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
> +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
> @@ -212,6 +212,8 @@ void rmnet_vnd_setup(struct net_device *rmnet_dev)
>  	rmnet_dev->needs_free_netdev = true;
>  	rmnet_dev->ethtool_ops = &rmnet_ethtool_ops;
> 
> +	rmnet_dev->features |= NETIF_F_LLTX;
> +
>  	/* This perm addr will be used as interface identifier by IPv6 */
>  	rmnet_dev->addr_assign_type = NET_ADDR_RANDOM;
>  	eth_random_addr(rmnet_dev->perm_addr);

Hi Taehee

It seems the flag is deprecated per documentation.

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/tree/Documentation/networking/netdevices.txt#n73