netdev - Re: [PATCH xfrm-next v9 4/8] xfrm: add TX datapath support for IPsec packet offload mode

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Date:   Fri, 2 Dec 2022 10:30:28 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Leon Romanovsky <leonro@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        Bharat Bhushan <bbhushan2@...vell.com>
Subject: Re: [PATCH xfrm-next v9 4/8] xfrm: add TX datapath support for IPsec
 packet offload mode

On Sun, Nov 27, 2022 at 01:18:14PM +0200, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> In IPsec packet mode, the device is going to encrypt and encapsulate
> packets that are associated with offloaded policy. After successful
> policy lookup to indicate if packets should be offloaded or not,
> the stack forwards packets to the device to do the magic.
> 
> Signed-off-by: Raed Salem <raeds@...dia.com>
> Signed-off-by: Huy Nguyen <huyn@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
>  net/xfrm/xfrm_device.c |  15 +++++-
>  net/xfrm/xfrm_output.c |  12 ++++-
>  net/xfrm/xfrm_state.c  | 120 +++++++++++++++++++++++++++++++++++++++--
>  3 files changed, 141 insertions(+), 6 deletions(-)
...
> @@ -1161,7 +1240,31 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
>  			x = NULL;
>  			goto out;
>  		}
> -
> +#ifdef CONFIG_XFRM_OFFLOAD
> +		if (pol->xdo.type == XFRM_DEV_OFFLOAD_PACKET) {
> +			struct xfrm_dev_offload *xdo = &pol->xdo;
> +			struct xfrm_dev_offload *xso = &x->xso;
> +
> +			xso->type = XFRM_DEV_OFFLOAD_PACKET;
> +			xso->dir = xdo->dir;
> +			xso->dev = xdo->dev;
> +			xso->real_dev = xdo->real_dev;
> +			netdev_tracker_alloc(xso->dev, &xso->dev_tracker,
> +					     GFP_ATOMIC);
> +			error = xso->dev->xfrmdev_ops->xdo_dev_state_add(x);
> +			if (error) {
> +				xso->dir = 0;
> +				netdev_put(xso->dev, &xso->dev_tracker);
> +				xso->dev = NULL;
> +				xso->real_dev = NULL;
> +				xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
> +				x->km.state = XFRM_STATE_DEAD;
> +				to_put = x;
> +				x = NULL;
> +				goto out;
> +			}
> +		}
> +#endif
>  		if (km_query(x, tmpl, pol) == 0) {
>  			spin_lock_bh(&net->xfrm.xfrm_state_lock);
>  			x->km.state = XFRM_STATE_ACQ;
> @@ -1185,6 +1288,17 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
>  			xfrm_hash_grow_check(net, x->bydst.next != NULL);
>  			spin_unlock_bh(&net->xfrm.xfrm_state_lock);
>  		} else {
> +#ifdef CONFIG_XFRM_OFFLOAD
> +			struct xfrm_dev_offload *xso = &x->xso;
> +
> +			if (xso->type == XFRM_DEV_OFFLOAD_PACKET) {
> +				xso->dir = 0;
> +				netdev_put(xso->dev, &xso->dev_tracker);
> +				xso->dev = NULL;
> +				xso->real_dev = NULL;
> +				xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
> +			}

You do a xdo_dev_state_add call to add an acquire state to HW above.
Maybe we should do a xdo_dev_state_del call here when deleting the
acquire state.

> +#endif
>  			x->km.state = XFRM_STATE_DEAD;
>  			to_put = x;
>  			x = NULL;
> -- 
> 2.38.1