Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH net-next 2/6] net: 8021q: vlan_dev: add vid tag to
 addresses of uc and mc lists
To:     Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>, davem@davemloft.net,
        grygorii.strashko@ti.com
Cc:     linux-omap@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, jiri@mellanox.com,
        ilias.apalodimas@linaro.org
References: <20190226184556.16082-1-ivan.khoronzhuk@linaro.org>
 <20190226184556.16082-3-ivan.khoronzhuk@linaro.org>
From:   Florian Fainelli <f.fainelli@gmail.com>
Openpgp: preference=signencrypt
Autocrypt: addr=f.fainelli@gmail.com; keydata=
 mQENBFPAG8ABCAC3EO02urEwipgbUNJ1r6oI2Vr/+uE389lSEShN2PmL3MVnzhViSAtrYxeT
 M0Txqn1tOWoIc4QUl6Ggqf5KP6FoRkCrgMMTnUAINsINYXK+3OLe7HjP10h2jDRX4Ajs4Ghs
 JrZOBru6rH0YrgAhr6O5gG7NE1jhly+EsOa2MpwOiXO4DE/YKZGuVe6Bh87WqmILs9KvnNrQ
 PcycQnYKTVpqE95d4M824M5cuRB6D1GrYovCsjA9uxo22kPdOoQRAu5gBBn3AdtALFyQj9DQ
 KQuc39/i/Kt6XLZ/RsBc6qLs+p+JnEuPJngTSfWvzGjpx0nkwCMi4yBb+xk7Hki4kEslABEB
 AAG0KEZsb3JpYW4gRmFpbmVsbGkgPGZhaW5lbGxpQGJyb2FkY29tLmNvbT6JAccEEAECALEF
 AlPAG9YXCgABv0jL/n0t8VEFmtDa8j7qERo7AN0gFAAAAAAAFgABa2V5LXVzYWdlLW1hc2tA
 cGdwLmNvbY4wFIAAAAAAIAAHcHJlZmVycmVkLWVtYWlsLWVuY29kaW5nQHBncC5jb21wZ3Bt
 aW1lCAsJCAcDAgEKAhkBBReAAAAAGRhsZGFwOi8va2V5cy5icm9hZGNvbS5jb20FGwMAAAAD
 FgIBBR4BAAAABBUICQoACgkQgTG1xCm8ZqD+Dgf9HhhzqvJYIPomNeg+ll7/TbzWb871E+HQ
 TaufJQFQwLEbgdFSZO2uj4UqfDpCyTwtHTVMJogWt3pCAE1sadeIY8OlT6918ofKIl8AiHj2
 BlfL7ASZ5wzkRMt/4TZoinq9O1tPEynb5G6PdZTV3UQtmSGnpt2EOu7KtRJsnThBiXoOO9TJ
 Asg4vXJ0ZM1y/MPhQlZbPCHQZFe1gaVWBPLGnLyWyeprqgSLWHaGqrUhlfK1sLuJK1bjYDCI
 NetK0pS4cA4ZJgogr5FrtV64R19zLl02mt/Yj7rAmjC3ZBuwVi3V35kD8Kd4d9QM2apsiILV
 bzGbtVCSUgvxI+1SsJEm3bkBDQRTwBvBAQgArGvvWip77T4xgJztZp9YRylAcVTC9gtx0Gg6
 eYk/EPANGm9TkuGpI++T/Il2H2TjFQNC7eubWohbYj0+6Tmf8nP+VmyobDxPXcMrK7x4xy9o
 D+Kub2Vf0SXbsM8fL/SqzGbFWZSm73L1L4GZoxvYIz0i7LExYSX2u5YVLaMBaH9HwKt2cvr7
 MuTrRHtcbOZImoXT29g2UnoF1uwxYNeRhZY/lRvVkkY0lDipPuDwg3SpfHMtCybPq1uAswQd
 gEbHzRsEXwCR1OF3pIuGt4I3tSEhH/k1caqi0BlqjbGUOkku44xC2gf1ZU267FBBkdV3yJ/7
 KnrJEnkMCYhS3kII9wARAQABiQJBBBgBAgErBQJTwBvCBRsMAAAAwF0gBBkBCAAGBQJTwBvB
 AAoJEJNgBqiYLw9VDRUIAJaTef6hsUAESnlGDpC+ymL2RZdzAJx9lXjU4hhaFcyhznuyyMJq
 d3mehmLxsqDRvHDiqyD71w2Bnc838MVZw0pwBPdnb/h9Ocmp0lL/9hwSGWvy4az5lYVyoA9u
 14UIzh0YNGu6jr0isd/LJAbHXqwJwWWs3y8PTrpEp68V6lv+aXt5gR03lJEAvIR1Awp4JJ/e
 Z5y12gQISp0X8xal9YhhDWER92YLYrO2b6Hc2S31lAupzfCw8lmZsP1PRz1GmF/KmDD9J9N/
 b8IehhWQqrBQjMjn2K2XkvN75HnAMHKFYfHZR3ZHtK52ZP1crV7THtbtrnPXVDq+vO4QPmdC
 +SEACgkQgTG1xCm8ZqC6BwgAl3kRh7oozpjpG8jpO8en5CBtTl3G+OpKJK9qbQyzdCsuJ0K1
 qe1wZPZbP/Y+VtmqSgnExBzjStt9drjFBK8liPQZalp2sMlS9S7csSy6cMLF1auZubAZEqpm
 tpXagbtgR12YOo57Reb83F5KhtwwiWdoTpXRTx/nM0cHtjjrImONhP8OzVMmjem/B68NY++/
 qt0F5XTsP2zjd+tRLrFh3W4XEcLt1lhYmNmbJR/l6+vVbWAKDAtcbQ8SL2feqbPWV6VDyVKh
 ya/EEq0xtf84qEB+4/+IjCdOzDD3kDZJo+JBkDnU3LBXw4WCw3QhOXY+VnhOn2EcREN7qdAK
 w0j9Sw==
Message-ID: <72ecf925-f818-3d6b-4f96-b01daabd21f2@gmail.com>
Date:   Wed, 27 Feb 2019 20:09:44 -0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.5.2
MIME-Version: 1.0
In-Reply-To: <20190226184556.16082-3-ivan.khoronzhuk@linaro.org>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


On 2/26/2019 10:45 AM, Ivan Khoronzhuk wrote:
> Update vlan mc and uc addresses with VID tag while propagating
> addresses to lower devices, do this only if address is not synced.
> It allows at end driver level to distinguish addresses belonging
> to vlan devices.
> 
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
> ---

[snip]

>  
> +u16 vlan_dev_get_addr_vid(struct net_device *dev, const u8 *addr)

Having some kernel doc comment here would also be nice.

> +{
> +	u16 vid = 0;
> +
> +	if (dev->vid_len != NET_8021Q_VID_TSIZE)
> +		return vid;
> +
> +	vid = addr[dev->addr_len];
> +	vid |= (addr[dev->addr_len + 1] & 0xf) << 8;

This uses knowledge of the maximum VLAN ID is 4095, which is fine, might
be a good idea to add a check on VID not exceeding the maximum VLAN ID
number instead of doing a silent truncation?

[snip]

> +static void vlan_dev_align_addr_vid(struct net_device *vlan_dev)
> +{
> +	struct net_device *real_dev = vlan_dev_real_dev(vlan_dev);
> +	struct netdev_hw_addr *ha;
> +
> +	if (!real_dev->vid_len)
> +		return;

Should not this check be moved to dev_{mc,uc}_sync? It does not seem to
me like this would scale really well across different stacked devices
(VLAN, bond, macvlan) as well as underlying drivers (cpsw, dsa, etc.).
Or maybe the check should be if vlan_dev->vid_len > real_dev->vid_len ->
error, right?
-- 
Florian