netdev - Re: [PATCH net-next v1 06/10] net/mlx5e: Support IPsec TX packet offload in tunnel mode

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Date:   Tue, 18 Apr 2023 09:09:13 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Raed Salem <raeds@...dia.com>, Emeel Hakim <ehakim@...dia.com>
Subject: Re: [PATCH net-next v1 06/10] net/mlx5e: Support IPsec TX packet
 offload in tunnel mode

On Tue, Apr 18, 2023 at 09:48:27AM +0300, Leon Romanovsky wrote:
> On Mon, Apr 17, 2023 at 03:23:55PM +0200, Simon Horman wrote:
> > On Thu, Apr 13, 2023 at 03:29:24PM +0300, Leon Romanovsky wrote:
> > > From: Leon Romanovsky <leonro@...dia.com>
> > > 
> > > Extend mlx5 driver with logic to support IPsec TX packet offload
> > > in tunnel mode.
> > > 
> > > Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> 
> <...>
> 
> > > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
> > > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
> > > @@ -271,6 +271,18 @@ static void mlx5e_ipsec_init_macs(struct mlx5e_ipsec_sa_entry *sa_entry,
> > >  		neigh_ha_snapshot(addr, n, netdev);
> > >  		ether_addr_copy(attrs->smac, addr);
> > >  		break;
> > > +	case XFRM_DEV_OFFLOAD_OUT:
> > > +		ether_addr_copy(attrs->smac, addr);
> > > +		n = neigh_lookup(&arp_tbl, &attrs->daddr.a4, netdev);
> > > +		if (!n) {
> > > +			n = neigh_create(&arp_tbl, &attrs->daddr.a4, netdev);
> > > +			if (IS_ERR(n))
> > > +				return;
> > > +			neigh_event_send(n, NULL);
> > > +		}
> > > +		neigh_ha_snapshot(addr, n, netdev);
> > > +		ether_addr_copy(attrs->dmac, addr);
> > > +		break;
> > 
> > I see no problem with the above code.
> > However, it does seem very similar to the code for the previous case,
> > XFRM_DEV_OFFLOAD_IN. Perhaps this could be refactored somehow.
> 
> Yes, it can be refactored to something like this:

Thanks Leon,

this looks good to me.

> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
> index 59b9927ac90f..55b38544422f 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
> @@ -252,6 +252,8 @@ static void mlx5e_ipsec_init_macs(struct mlx5e_ipsec_sa_entry *sa_entry,
>  	struct net_device *netdev;
>  	struct neighbour *n;
>  	u8 addr[ETH_ALEN];
> +	const void *pkey;
> +	u8 *dst, *src;
>  
>  	if (attrs->mode != XFRM_MODE_TUNNEL ||
>  	    attrs->type != XFRM_DEV_OFFLOAD_PACKET)
> @@ -262,36 +264,31 @@ static void mlx5e_ipsec_init_macs(struct mlx5e_ipsec_sa_entry *sa_entry,
>  	mlx5_query_mac_address(mdev, addr);
>  	switch (attrs->dir) {
>  	case XFRM_DEV_OFFLOAD_IN:
> -		ether_addr_copy(attrs->dmac, addr);
> -		n = neigh_lookup(&arp_tbl, &attrs->saddr.a4, netdev);
> -		if (!n) {
> -			n = neigh_create(&arp_tbl, &attrs->saddr.a4, netdev);
> -			if (IS_ERR(n))
> -				return;
> -			neigh_event_send(n, NULL);
> -			attrs->drop = true;
> -			break;
> -		}
> -		neigh_ha_snapshot(addr, n, netdev);
> -		ether_addr_copy(attrs->smac, addr);
> +		src = attrs->dmac;
> +		dst = attrs->smac;
> +		pkey = &attrs->saddr.a4;
>  		break;
>  	case XFRM_DEV_OFFLOAD_OUT:
> -		ether_addr_copy(attrs->smac, addr);
> -		n = neigh_lookup(&arp_tbl, &attrs->daddr.a4, netdev);
> -		if (!n) {
> -			n = neigh_create(&arp_tbl, &attrs->daddr.a4, netdev);
> -			if (IS_ERR(n))
> -				return;
> -			neigh_event_send(n, NULL);
> -			attrs->drop = true;
> -			break;
> -		}
> -		neigh_ha_snapshot(addr, n, netdev);
> -		ether_addr_copy(attrs->dmac, addr);
> +		src = attrs->smac;
> +		dst = attrs->dmac;
> +		pkey = &attrs->daddr.a4;
>  		break;
>  	default:
>  		return;
>  	}
> +
> +	ether_addr_copy(src, addr);
> +	n = neigh_lookup(&arp_tbl, pkey, netdev);
> +	if (!n) {
> +		n = neigh_create(&arp_tbl, pkey, netdev);
> +		if (IS_ERR(n))
> +			return;
> +		neigh_event_send(n, NULL);
> +		attrs->drop = true;
> +	} else {
> +		neigh_ha_snapshot(addr, n, netdev);
> +		ether_addr_copy(dst, addr);
> +	}
>  	neigh_release(n);
>  }
>  
> 
> Thanks