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

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Message-ID: <20180502145607.GH5105@localhost.localdomain>
Date:   Wed, 2 May 2018 11:56:07 -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 Wed, May 02, 2018 at 11:53:47AM -0300, Marcelo Ricardo Leitner wrote:
> 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;

Missed to paste the next line too:
                dev->features = dev->hw_features | NETIF_F_LLTX;