linux-kernel - Re: [PATCH RFC net-next 1/7] netdev_features: remove unused __UNUSED_NETIF_F

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Date: Fri, 5 Apr 2024 17:15:58 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, David Ahern <dsahern@...nel.org>, Xuan Zhuo
	<xuanzhuo@...ux.alibaba.com>, <nex.sw.ncis.osdt.itp.upstreaming@...el.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC net-next 1/7] netdev_features: remove unused
 __UNUSED_NETIF_F_1

From: Andrew Lunn <andrew@...n.ch>
Date: Fri, 5 Apr 2024 16:12:50 +0200

> On Fri, Apr 05, 2024 at 03:37:25PM +0200, Alexander Lobakin wrote:
>> NETIF_F_NO_CSUM was removed in 3.2-rc2 by commit 34324dc2bf27
>> ("net: remove NETIF_F_NO_CSUM feature bit") and became
>> __UNUSED_NETIF_F_1. It's not used anywhere in the code.
>> Remove this bit waste.
>>
>> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
>> ---
>>  include/linux/netdev_features.h | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
>> index 7c2d77d75a88..44c428d62db4 100644
>> --- a/include/linux/netdev_features.h
>> +++ b/include/linux/netdev_features.h
>> @@ -14,7 +14,6 @@ typedef u64 netdev_features_t;
>>  enum {
>>  	NETIF_F_SG_BIT,			/* Scatter/gather IO. */
>>  	NETIF_F_IP_CSUM_BIT,		/* Can checksum TCP/UDP over IPv4. */
>> -	__UNUSED_NETIF_F_1,
>>  	NETIF_F_HW_CSUM_BIT,		/* Can checksum all the packets. */
>>  	NETIF_F_IPV6_CSUM_BIT,		/* Can checksum TCP/UDP over IPV6 */
>>  	NETIF_F_HIGHDMA_BIT,		/* Can DMA to high memory. */
> 
> Are you sure this enum is not ABI?

Why should this be ABI? It's not a part of UAPI and Ethtool receives
these bits together with string names.

> 
> It would be good to add an explanation why it is not ABI to the cover
> letter.
> 
> 	Andrew

Thanks,
Olek