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Message-ID: <20240408193806.18e227c8@kernel.org>
Date: Mon, 8 Apr 2024 19:38:06 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
<edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, David Ahern
<dsahern@...nel.org>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Andrew Lunn
<andrew@...n.ch>, nex.sw.ncis.osdt.itp.upstreaming@...el.com,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 7/7] netdev_features: convert
NETIF_F_FCOE_MTU to IFF_FCOE_MTU
On Fri, 5 Apr 2024 15:37:31 +0200 Alexander Lobakin wrote:
> Ability to handle maximum FCoE frames of 2158 bytes can never be changed
> and thus more of an attribute, not a toggleable feature.
> Move it from netdev_features_t to netdev_priv_flags and free one more
> feature bit.
> @@ -1700,6 +1701,7 @@ enum netdev_priv_flags {
> IFF_NETNS_LOCAL = BIT_ULL(35),
> IFF_HIGHDMA = BIT_ULL(36),
> IFF_VLAN_CHALLENGED = BIT_ULL(37),
> + IFF_FCOE_MTU = BIT_ULL(38),
> IFF_LOGICAL = IFF_NO_QUEUE | IFF_LLTX,
> IFF_ONE_FOR_ALL = IFF_HIGHDMA | IFF_VLAN_CHALLENGED,
> IFF_ALL_FOR_ALL = IFF_XMIT_DST_RELEASE |
Any reason not to make it a bitfield? I haven't looked at the longer
patches but this one seems to be used like a basic bool.
> diff --git a/net/ethtool/common.c b/net/ethtool/common.c
> index 2de4dd5a30de..71e36e1a1b15 100644
> --- a/net/ethtool/common.c
> +++ b/net/ethtool/common.c
> @@ -47,7 +47,6 @@ const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN] = {
>
> [NETIF_F_FCOE_CRC_BIT] = "tx-checksum-fcoe-crc",
> [NETIF_F_SCTP_CRC_BIT] = "tx-checksum-sctp",
> - [NETIF_F_FCOE_MTU_BIT] = "fcoe-mtu",
But this definitely _is_ a uAPI change, right?
Some analysis why this is fine and why avoiding the problem isn't worth
it in the cover letter would be great.
> [NETIF_F_NTUPLE_BIT] = "rx-ntuple-filter",
> [NETIF_F_RXHASH_BIT] = "rx-hashing",
> [NETIF_F_RXCSUM_BIT] = "rx-checksum",
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