linux-kernel - Re: [PATCH resend net] net: ethtool: add missing NETIF_F_GSO

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Date:   Wed, 17 Jun 2020 21:38:47 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Aya Levin <ayal@...lanox.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Willem de Bruijn <willemb@...gle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH resend net] net: ethtool: add missing NETIF_F_GSO_FRAGLIST feature string

Hi Michal,

On Thursday, 18 June 2020, 0:18, Michal Kubecek <mkubecek@...e.cz> wrote:

> On Wed, Jun 17, 2020 at 08:42:47PM +0000, Alexander Lobakin wrote:
>
> > Commit 3b33583265ed ("net: Add fraglist GRO/GSO feature flags") missed
> > an entry for NETIF_F_GSO_FRAGLIST in netdev_features_strings array. As
> > a result, fraglist GSO feature is not shown in 'ethtool -k' output and
> > can't be toggled on/off.
> > The fix is trivial.
> >
> > Fixes: 3b33583265ed ("net: Add fraglist GRO/GSO feature flags")
> > Signed-off-by: Alexander Lobakin alobakin@...me
> >
> > ----------------------------------------------------------------------------------------------------------------
> >
> > net/ethtool/common.c | 1 +
> > 1 file changed, 1 insertion(+)
> > diff --git a/net/ethtool/common.c b/net/ethtool/common.c
> > index 423e640e3876..47f63526818e 100644
> > --- a/net/ethtool/common.c
> > +++ b/net/ethtool/common.c
> > @@ -43,6 +43,7 @@ const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
> > [NETIF_F_GSO_SCTP_BIT] = "tx-sctp-segmentation",
> > [NETIF_F_GSO_ESP_BIT] = "tx-esp-segmentation",
> > [NETIF_F_GSO_UDP_L4_BIT] = "tx-udp-segmentation",
> >
> > -   [NETIF_F_GSO_FRAGLIST_BIT] = "tx-gso-list",
> >     [NETIF_F_FCOE_CRC_BIT] = "tx-checksum-fcoe-crc",
> >     [NETIF_F_SCTP_CRC_BIT] = "tx-checksum-sctp",
> >
>
> Reviewed-by: Michal Kubecekmkubecek@...e.cz

Thanks!

> AFAICS the name for NETIF_F_GSO_TUNNEL_REMCSUM_BIT is also missing but
> IMHO it will be better to fix that by a separate patch with its own
> Fixes tag.

Oh, nice catch! I'll make a separate for this one.
I also wanted to add any sort of static_assert() / BUILD_BUG_ON() to
prevent such misses, but don't see any easy pattern to check for now,
as netdev_features_strings[] is always NETDEV_FEATURE_COUNT-sized.

> Michal