netdev - Re: [bug report] net/mlx5e: TLS, Add Innova TLS TX offload data path

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Date:   Thu, 3 May 2018 15:07:57 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Boris Pismenny <borisp@...lanox.com>
Cc:     linux-rdma@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [bug report] net/mlx5e: TLS, Add Innova TLS TX offload data path

+ Saeed, Boris and netdev

On Thu, May 03, 2018 at 02:23:00PM +0300, Dan Carpenter wrote:
> Hello Ilya Lesokhin,
>
> The patch bf23974104fa: "net/mlx5e: TLS, Add Innova TLS TX offload
> data path" from Apr 30, 2018, leads to the following static checker
> warning:
>
> 	drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls_rxtx.c:63 mlx5e_tls_add_metadata()
> 	warn: struct type mismatch 'ethhdr vs mlx5e_tls_metadata'
>
> drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls_rxtx.c
>     55  static int mlx5e_tls_add_metadata(struct sk_buff *skb, __be32 swid)
>     56  {
>     57          struct mlx5e_tls_metadata *pet;
>     58          struct ethhdr *eth;
>                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>     59
>     60          if (skb_cow_head(skb, sizeof(struct mlx5e_tls_metadata)))
>                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>     61                  return -ENOMEM;
>     62
>     63          eth = (struct ethhdr *)skb_push(skb, sizeof(struct mlx5e_tls_metadata));
>                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> This feels like it should be sizeof(*eth) + sizeof(*pet)?
>
>     64          skb->mac_header -= sizeof(struct mlx5e_tls_metadata);
>     65          pet = (struct mlx5e_tls_metadata *)(eth + 1);
>     66
>     67          memmove(skb->data, skb->data + sizeof(struct mlx5e_tls_metadata),
>     68                  2 * ETH_ALEN);
>     69
>     70          eth->h_proto = cpu_to_be16(MLX5E_METADATA_ETHER_TYPE);
>     71          pet->syndrome_swid = htonl(SYNDROME_OFFLOAD_REQUIRED << 24) | swid;
>     72
>     73          return 0;
>     74  }
>
> regards,
> dan carpenter
> --
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