netdev - Re: [PATCH net-next] net: ethtool: Allow parsing ETHER_FLOW types when using flow

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Date:   Wed, 26 Jun 2019 11:23:55 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     davem@...emloft.net, Florian Fainelli <f.fainelli@...il.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        thomas.petazzoni@...tlin.com
Subject: Re: [PATCH net-next] net: ethtool: Allow parsing ETHER_FLOW types
 when using flow_rule

Hi Pablo,

On Wed, 26 Jun 2019 10:58:46 +0200
Pablo Neira Ayuso <pablo@...filter.org> wrote:

>On Wed, Jun 26, 2019 at 10:44:03AM +0200, Maxime Chevallier wrote:
>> When parsing an ethtool_rx_flow_spec, users can specify an ethernet flow
>> which could contain matches based on the ethernet header, such as the
>> MAC address, the VLAN tag or the ethertype.
>> 
>> Only the ethtype field is specific to the ether flow, the MAC and vlan
>> fields are processed using the special FLOW_EXT and FLOW_MAC_EXT flags.
>> 
>> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
>> ---
>>  net/core/ethtool.c | 12 ++++++++++++
>>  1 file changed, 12 insertions(+)
>> 
>> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
>> index 4d1011b2e24f..01ceba556341 100644
>> --- a/net/core/ethtool.c
>> +++ b/net/core/ethtool.c
>> @@ -2883,6 +2883,18 @@ ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
>>  	match->mask.basic.n_proto = htons(0xffff);
>>  
>>  	switch (fs->flow_type & ~(FLOW_EXT | FLOW_MAC_EXT | FLOW_RSS)) {
>> +	case ETHER_FLOW: {
>> +		const struct ethhdr *ether_spec, *ether_m_spec;
>> +
>> +		ether_spec = &fs->h_u.ether_spec;
>> +		ether_m_spec = &fs->m_u.ether_spec;
>> +
>> +		if (ether_m_spec->h_proto) {
>> +			match->key.basic.n_proto = ether_spec->h_proto;
>> +			match->mask.basic.n_proto = ether_m_spec->h_proto;
>> +		}  
>
>I see some drivers in the tree also interpret the h_source and h_dest
>fields?

Ah yes you're right. I assumed these fields were specific to the
FLOW_MAC_EXT flags, but by looking into the ethtool code, it seems we
do need to handle the h_source and h_dest fields.

I'll respin with these fields added.

Thanks for the review,

Maxime