netdev - Re: [PATCH net v1] ixgbe: ensure IPsec VF<->PF compatibility

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Date:   Thu, 31 Mar 2022 09:14:47 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Leon Romanovsky <leon@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        intel-wired-lan@...ts.osuosl.org,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>, Raed Salem <raeds@...dia.com>,
        Shannon Nelson <shannon.nelson@...cle.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH net v1] ixgbe: ensure IPsec VF<->PF compatibility

On 3/31/22 1:20 AM, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
>
> The VF driver can forward any IPsec flags and such makes the function
> is not extendable and prone to backward/forward incompatibility.
>
> If new software runs on VF, it won't know that PF configured something
> completely different as it "knows" only XFRM_OFFLOAD_INBOUND flag.
>
> Fixes: eda0333ac293 ("ixgbe: add VF IPsec management")
> Reviewed-by: Raed Salem <raeds@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>a


Thanks!

Reviewed-by: Shannon Nelson <snelson@...sando.io>


> ---
> Chaagelog:
> v1:
>   * Replaced bits arithmetic with more simple expression
> v0: https://lore.kernel.org/all/3702fad8a016170947da5f3c521a9251cf0f4a22.1648637865.git.leonro@nvidia.com
> ---
>   drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> index e596e1a9fc75..69d11ff7677d 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
> @@ -903,7 +903,8 @@ int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
>   	/* Tx IPsec offload doesn't seem to work on this
>   	 * device, so block these requests for now.
>   	 */
> -	if (!(sam->flags & XFRM_OFFLOAD_INBOUND)) {
> +	sam->flags = sam->flags & ~XFRM_OFFLOAD_IPV6;
> +	if (sam->flags != XFRM_OFFLOAD_INBOUND) {
>   		err = -EOPNOTSUPP;
>   		goto err_out;
>   	}