linux-kernel - Re: [PATCH v6 RESEND net-next 5/5] net: enetc: add UDP segmentation offload support

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Message-ID: <CANn89i+E+kCZCNBtu=XnyLHsMNF=Ks9BkK1+qTQNxrPDQX-Mcw@mail.gmail.com>
Date: Sun, 8 Dec 2024 16:54:44 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Ido Schimmel <idosch@...sch.org>
Cc: Wei Fang <wei.fang@....com>, claudiu.manoil@....com, vladimir.oltean@....com, 
	xiaoning.wang@....com, andrew+netdev@...n.ch, davem@...emloft.net, 
	kuba@...nel.org, pabeni@...hat.com, frank.li@....com, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH v6 RESEND net-next 5/5] net: enetc: add UDP segmentation
 offload support

On Sun, Dec 8, 2024 at 4:09 PM Ido Schimmel <idosch@...sch.org> wrote:
>
> On Wed, Dec 04, 2024 at 01:29:32PM +0800, Wei Fang wrote:
> > Set NETIF_F_GSO_UDP_L4 bit of hw_features and features because i.MX95
> > enetc and LS1028A driver implements UDP segmentation.
> >
> > - i.MX95 ENETC supports UDP segmentation via LSO.
> > - LS1028A ENETC supports UDP segmentation since the commit 3d5b459ba0e3
> > ("net: tso: add UDP segmentation support").
> >
> > Signed-off-by: Wei Fang <wei.fang@....com>
> > Reviewed-by: Frank Li <Frank.Li@....com>
> > ---
> > v2: rephrase the commit message
> > v3: no changes
> > v4: fix typo in commit message
> > v5: no changes
> > v6: no changes
> > ---
> >  drivers/net/ethernet/freescale/enetc/enetc_pf_common.c | 6 ++++--
> >  drivers/net/ethernet/freescale/enetc/enetc_vf.c        | 6 ++++--
> >  2 files changed, 8 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
> > index 82a67356abe4..76fc3c6fdec1 100644
> > --- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
> > +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
> > @@ -110,11 +110,13 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
> >       ndev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
> >                           NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
> >                           NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_LOOPBACK |
> > -                         NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6;
> > +                         NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6 |
> > +                         NETIF_F_GSO_UDP_L4;
> >       ndev->features = NETIF_F_HIGHDMA | NETIF_F_SG | NETIF_F_RXCSUM |
> >                        NETIF_F_HW_VLAN_CTAG_TX |
> >                        NETIF_F_HW_VLAN_CTAG_RX |
> > -                      NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6;
> > +                      NETIF_F_HW_CSUM | NETIF_F_TSO | NETIF_F_TSO6 |
> > +                      NETIF_F_GSO_UDP_L4;
> >       ndev->vlan_features = NETIF_F_SG | NETIF_F_HW_CSUM |
> >                             NETIF_F_TSO | NETIF_F_TSO6;
>
> I didn't see any wording about it in the commit message / cover letter
> so I will ask: Any reason not to enable UDP segmentation offload on
> upper VLAN devices by setting the feature in 'ndev->vlan_features'?

Going to back to my commit, it stated that net/core/tso.c was only
dealing with basic stuff.

Adding vlan support would need some changes there, I guess this should
be done if there is enough interest and testing.

    commit 3d5b459ba0e3788ab471e8cb98eee89964a9c5e8    net: tso: add
UDP segmentation support

    Note that like TCP, we do not support additional encapsulations,
    and that checksums must be offloaded to the NIC.