netdev - Re: [PATCH net-next 05/10] net/mlx5e: Support IPsec RX packet offload in tunnel mode

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Date:   Tue, 11 Apr 2023 18:37:03 +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>,
        Leon Romanovsky <leonro@...dia.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 05/10] net/mlx5e: Support IPsec RX packet
 offload in tunnel mode

On Mon, Apr 10, 2023 at 09:19:07AM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> Extend mlx5 driver with logic to support IPsec RX packet offload
> in tunnel mode.
> 
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>

...

> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c
> index 980583fb1e52..8ecaf4100b9c 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_fs.c
> @@ -836,6 +836,60 @@ static int setup_modify_header(struct mlx5_core_dev *mdev, u32 val, u8 dir,
>  	return 0;
>  }
>  
> +static int
> +setup_pkt_tunnel_reformat(struct mlx5_core_dev *mdev,
> +			  struct mlx5_accel_esp_xfrm_attrs *attrs,
> +			  struct mlx5_pkt_reformat_params *reformat_params)
> +{
> +	union {
> +		struct {
> +			u8 dmac[6];
> +			u8 smac[6];
> +			__be16 ethertype;
> +		} __packed;
> +		u8 raw[ETH_HLEN];
> +	} __packed *mac_hdr;

Can struct ethhrd be used here?
I think it has the same layout as the fields of the inner structure above.
And I don't think the union is giving us much: the raw field seems unused.

> +	char *reformatbf;
> +	size_t bfflen;
> +
> +	bfflen = sizeof(*mac_hdr);
> +
> +	reformatbf = kzalloc(bfflen, GFP_KERNEL);

I'm not sure that reformatbf is providing much value.
Perhaps:

	mac_hdr = kzalloc(bfflen, GFP_KERNEL);

> +	if (!reformatbf)
> +		return -ENOMEM;
> +
> +	mac_hdr = (void *)reformatbf;

If you must cast, perhaps to the type of mac_hdr, which is not void *.

> +	switch (attrs->family) {
> +	case AF_INET:
> +		mac_hdr->ethertype = htons(ETH_P_IP);
> +		break;
> +	case AF_INET6:
> +		mac_hdr->ethertype = htons(ETH_P_IPV6);
> +		break;
> +	default:
> +		goto free_reformatbf;
> +	}
> +
> +	ether_addr_copy(mac_hdr->dmac, attrs->dmac);
> +	ether_addr_copy(mac_hdr->smac, attrs->smac);
> +
> +	switch (attrs->dir) {
> +	case XFRM_DEV_OFFLOAD_IN:
> +		reformat_params->type = MLX5_REFORMAT_TYPE_L3_ESP_TUNNEL_TO_L2;
> +		break;
> +	default:
> +		goto free_reformatbf;
> +	}
> +
> +	reformat_params->size = bfflen;
> +	reformat_params->data = reformatbf;
> +	return 0;
> +
> +free_reformatbf:
> +	kfree(reformatbf);
> +	return -EINVAL;
> +}

...