netdev - Re: [PATCH net-next v4 2/6] Define neigh_for

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241015225712.65071-1-kuniyu@amazon.com>
Date: Tue, 15 Oct 2024 15:57:12 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <gnaaman@...venets.com>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<kuniyu@...zon.com>, <netdev@...r.kernel.org>, <pabeni@...hat.com>
Subject: Re: [PATCH net-next v4 2/6] Define neigh_for_each

From: Gilad Naaman <gnaaman@...venets.com>
Date: Tue, 15 Oct 2024 16:59:22 +0000
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> index 800dfb64ec83..0bb46aba2502 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> @@ -3006,6 +3006,27 @@ static void mlxsw_sp_neigh_rif_made_sync_each(struct neighbour *n, void *data)
>  		rms->err = -ENOMEM;
>  }
>  
> +static void mlxsw_sp_neigh_for_each(struct neigh_table *tbl,
> +				    void (*cb)(struct neighbour *, void *),

The function pointer is no longer needed as cb() is always
mlxsw_sp_neigh_rif_made_sync_each().

Also, please CC this driver's maintainers next time.

  git show --format=email | ./scripts/get_maintainer.pl


> +				    void *cookie)
> +{
> +	int chain;
> +	struct neigh_hash_table *nht;

nit: reverse xmas tree order.


> +
> +	rcu_read_lock();
> +	nht = rcu_dereference(tbl->nht);
> +
> +	read_lock_bh(&tbl->lock); /* avoid resizes */
> +	for (chain = 0; chain < (1 << nht->hash_shift); chain++) {
> +		struct neighbour *n;
> +
> +		neigh_for_each(n, &nht->hash_heads[chain])
> +			cb(n, cookie);

This can be a direct call.


> +	}
> +	read_unlock_bh(&tbl->lock);
> +	rcu_read_unlock();
> +}
> +
>  static int mlxsw_sp_neigh_rif_made_sync(struct mlxsw_sp *mlxsw_sp,
>  					struct mlxsw_sp_rif *rif)
>  {
> @@ -3014,12 +3035,12 @@ static int mlxsw_sp_neigh_rif_made_sync(struct mlxsw_sp *mlxsw_sp,
>  		.rif = rif,
>  	};
>  
> -	neigh_for_each(&arp_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
> +	mlxsw_sp_neigh_for_each(&arp_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
>  	if (rms.err)
>  		goto err_arp;
>  
>  #if IS_ENABLED(CONFIG_IPV6)
> -	neigh_for_each(&nd_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
> +	mlxsw_sp_neigh_for_each(&nd_tbl, mlxsw_sp_neigh_rif_made_sync_each, &rms);
>  #endif
>  	if (rms.err)
>  		goto err_nd;