netdev - Re: [RFCv5 PATCH net-next 04/20] net: replace multiple feature bits with netdev features array

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Date:   Thu, 24 Mar 2022 18:22:35 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jian Shen <shenjian15@...wei.com>
Cc:     <davem@...emloft.net>, <andrew@...n.ch>, <ecree.xilinx@...il.com>,
        <hkallweit1@...il.com>, <alexandr.lobakin@...el.com>,
        <saeed@...nel.org>, <leon@...nel.org>, <netdev@...r.kernel.org>,
        <linuxarm@...neuler.org>, <lipeng321@...wei.com>
Subject: Re: [RFCv5 PATCH net-next 04/20] net: replace multiple feature bits
 with netdev features array

On Thu, 24 Mar 2022 23:49:16 +0800 Jian Shen wrote:
> There are many netdev_features bits group used in drivers, replace them
> with netdev features array.

Maybe we can avoid the ARRAY_SIZE calls by doing something like:

struct netdev_feature_set {
	unsigned int cnt;
	unsigned short feature_bits[];
};

#define DECLARE_NETDEV_FEATURE_SET(name, features...)    \                               
        static unsigned short __ ## name ## _s [] = {features}; \                               
        struct netdev_feature_set name = {               \                               
                .cnt = ARRAY_SIZE(__ ## name ## _s),     \                               
                .feature_bits = {features},              \                               
        }                                                                       

Then:

DECLARE_NETDEV_FEATURE_SET(siena_offload_features,
			   NETIF_F_IP_CSUM_BIT,
			   NETIF_F_IPV6_CSUM_BIT,
			   NETIF_F_RXHASH_BIT,
			   NETIF_F_NTUPLE_BIT);

etc.?