From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net] act_ife: Add support for machines with
 hard_header_len != mac_len
Date: Fri, 23 Sep 2016 07:05:36 -0400 (EDT)
Message-ID: <20160923.070536.1880911510074184857.davem@davemloft.net>
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From: Yotam Gigi <yotamg@mellanox.com>
Date: Wed, 21 Sep 2016 15:54:13 +0300

> Without that fix, the following could occur:
 ...

I don't think what you are doing in mlxsw is valid.

You can't set hard_header_len arbitrarily, it's the MAC length.

If you need to prepend special headers or whatever, set
->needed_headroom which is designed for this purpose.

Thanks.