netdev - Re: [RFC 3/7] net: ethernet: mtk_eth_soc: implement flow offloading to WED devices

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Message-ID: <544dcb50-a661-f230-5149-ec1a356b7665@nbd.name>
Date:   Wed, 14 Jul 2021 10:21:08 +0200
From:   Felix Fietkau <nbd@....name>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        ryder.lee@...iatek.com
Subject: Re: [RFC 3/7] net: ethernet: mtk_eth_soc: implement flow offloading
 to WED devices


On 2021-07-13 20:40, Pablo Neira Ayuso wrote:
> On Tue, Jul 13, 2021 at 06:07:41PM +0200, Felix Fietkau wrote:
> [...]
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index c253c2aafe97..7ea6a1db0338 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -885,6 +885,10 @@ int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr,
>>  		if (WARN_ON_ONCE(last_dev == ctx.dev))
>>  			return -1;
>>  	}
>> +
>> +	if (!ctx.dev)
>> +		return ret;
> 
> This is not a safety check, right? After this update ctx.dev might be NULL?
Right. I added this check to be able to prevent dev_fill_forward_path
from adding an extra DEV_PATH_ETHERNET entry, which is not applicable
for wlan devices.

- Felix