netdev - Re: [PATCH V2 net-next 4/6] tun: Add support for SCTP checksum offload

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Message-ID: <20180502145347.GG5105@localhost.localdomain>
Date:   Wed, 2 May 2018 11:53:47 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Vladislav Yasevich <vyasevich@...il.com>
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org, mst@...hat.com,
        jasowang@...hat.com, nhorman@...driver.com,
        Vladislav Yasevich <vyasevic@...hat.com>
Subject: Re: [PATCH V2 net-next 4/6] tun: Add support for SCTP checksum
 offload

On Tue, May 01, 2018 at 10:07:37PM -0400, Vladislav Yasevich wrote:
> Adds a new tun offload flag to allow for SCTP checksum offload.
> The flag has to be set by the user and defaults to "no offload".

I'm confused here:

> +++ b/drivers/net/tun.c
> @@ -216,7 +216,7 @@ struct tun_struct {
>  	struct net_device	*dev;
>  	netdev_features_t	set_features;
>  #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \
> -			  NETIF_F_TSO6)
> +			  NETIF_F_TSO6|NETIF_F_SCTP_CRC)

Doesn't adding it here mean it defaults to "offload", instead?

later on, it does:
                dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST |
                                   TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX |
                                   NETIF_F_HW_VLAN_STAG_TX;