netdev - Re: [PATCH v2 bpf-next 2/8] drivers: net: turn on XDP features

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Message-ID: <Y9L37bVacFMYdqVv@lore-desk>
Date:   Thu, 26 Jan 2023 23:00:13 +0100
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Gerhard Engleder <gerhard@...leder-embedded.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, toke@...hat.com, memxor@...il.com,
        alardam@...il.com, saeedm@...dia.com, anthony.l.nguyen@...el.com,
        gospo@...adcom.com, vladimir.oltean@....com, nbd@....name,
        john@...ozen.org, leon@...nel.org, simon.horman@...igine.com,
        aelior@...vell.com, christophe.jaillet@...adoo.fr,
        ecree.xilinx@...il.com, mst@...hat.com, bjorn@...nel.org,
        magnus.karlsson@...el.com, maciej.fijalkowski@...el.com,
        intel-wired-lan@...ts.osuosl.org, lorenzo.bianconi@...hat.com,
        martin.lau@...ux.dev
Subject: Re: [PATCH v2 bpf-next 2/8] drivers: net: turn on XDP features

> On 25.01.23 01:33, Lorenzo Bianconi wrote:
> > From: Marek Majtyka <alardam@...il.com>
> > 
> > A summary of the flags being set for various drivers is given below.
> > Note that XDP_F_REDIRECT_TARGET and XDP_F_FRAG_TARGET are features
> > that can be turned off and on at runtime. This means that these flags
> > may be set and unset under RTNL lock protection by the driver. Hence,
> > READ_ONCE must be used by code loading the flag value.
> > 
> > Also, these flags are not used for synchronization against the availability
> > of XDP resources on a device. It is merely a hint, and hence the read
> > may race with the actual teardown of XDP resources on the device. This
> > may change in the future, e.g. operations taking a reference on the XDP
> > resources of the driver, and in turn inhibiting turning off this flag.
> > However, for now, it can only be used as a hint to check whether device
> > supports becoming a redirection target.
> > 
> > Turn 'hw-offload' feature flag on for:
> >   - netronome (nfp)
> >   - netdevsim.
> > 
> > Turn 'native' and 'zerocopy' features flags on for:
> >   - intel (i40e, ice, ixgbe, igc)
> >   - mellanox (mlx5).
> >   - stmmac
> > 
> > Turn 'native' features flags on for:
> >   - amazon (ena)
> >   - broadcom (bnxt)
> >   - freescale (dpaa, dpaa2, enetc)
> >   - funeth
> >   - intel (igb)
> >   - marvell (mvneta, mvpp2, octeontx2)
> >   - mellanox (mlx4)
> >   - qlogic (qede)
> >   - sfc
> >   - socionext (netsec)
> >   - ti (cpsw)
> >   - tap
> >   - veth
> >   - xen
> >   - virtio_net.
> > 
> > Turn 'basic' (tx, pass, aborted and drop) features flags on for:
> >   - netronome (nfp)
> >   - cavium (thunder)
> >   - hyperv.
> > 
> > Turn 'redirect_target' feature flag on for:
> >   - amanzon (ena)
> >   - broadcom (bnxt)
> >   - freescale (dpaa, dpaa2)
> >   - intel (i40e, ice, igb, ixgbe)
> >   - ti (cpsw)
> >   - marvell (mvneta, mvpp2)
> >   - sfc
> >   - socionext (netsec)
> >   - qlogic (qede)
> >   - mellanox (mlx5)
> >   - tap
> >   - veth
> >   - virtio_net
> >   - xen
> 
> XDP support for tsnep was merged to net-next last week. So this driver
> cannot get XDP feature support in bpf-next as it is not there currently.
> Should I add these flags with a fix afterwards? Or would net-next be the
> better target for this patch series?

It is better to target this series to bpf-next I guess since there are some
libbpf and bpf changes.
I would say we can fix tsnep with a follow-up patch or I can add it to the
series if bpf-next will be rebased before the series is merged, it depends on
the upstream discussion.

Regards,
Lorenzo

> 
> Gerhard

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