netdev - Re: [PATCH net-next 1/6] flow_offload: add flow_rule_no_unsupp_control

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Message-ID: <e35f1f15-9c39-4e9c-a4af-bfa59e0e1a6f@fiberby.net>
Date: Tue, 9 Apr 2024 11:27:53 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: Baowen Zheng <baowen.zheng@...igine.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Louis Peens <louis.peens@...igine.com>,
 Taras Chornyi <taras.chornyi@...ision.eu>,
 Woojung Huh <woojung.huh@...rochip.com>,
 "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Yanguo Li <yanguo.li@...hogine.com>, oss-drivers <oss-drivers@...igine.com>,
 Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>,
 Vladimir Oltean <olteanv@...il.com>, Edward Cree <ecree.xilinx@...il.com>,
 Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>,
 Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH net-next 1/6] flow_offload: add
 flow_rule_no_unsupp_control_flags()

Hi Baowen,

On 4/9/24 1:56 AM, Baowen Zheng wrote:
> On April 8, 2024 9:09 PM,  Asbjørn wrote:
> 
>> This helper can be used by drivers to check for the presence of unsupported
>> control flags.
>>
>> It mirrors the existing check done in sfc:
>>   drivers/net/ethernet/sfc/tc.c +276
>>
>> This is aimed at drivers, which implements some control flags.
>>
>> This should also be used by drivers that implement all current flags, so that
>> future flags will be unsupported by default.
>>
>> Only compile-tested.
>>
>> Signed-off-by: Asbjørn Sloth Tønnesen <ast@...erby.net>
>> ---
>> include/net/flow_offload.h | 22 ++++++++++++++++++++++
>> 1 file changed, 22 insertions(+)
>>
>> diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h index
>> 314087a5e1818..c1317b14da08c 100644
>> --- a/include/net/flow_offload.h
>> +++ b/include/net/flow_offload.h
>> @@ -449,6 +449,28 @@ static inline bool flow_rule_match_key(const struct
>> flow_rule *rule,
>>         return dissector_uses_key(rule->match.dissector, key);  }
>>
>> +/**
>> + * flow_rule_no_unsupp_control_flags() - check for unsupported control
>> +flags
>> + * @supp_flags: flags supported by driver
>> + * @flags: flags present in rule
>> + * @extack: The netlink extended ACK for reporting errors.
>> + *
>> + * Returns true if only supported control flags are set, false otherwise.
>> + */
>> +static inline bool flow_rule_no_unsupp_control_flags(const u32 supp_flags,
>> +                                                    const u32 flags,
>> +
> Hi Asbjørn, thanks for your work, it makes sense for driver check. Will it better to name flags as "ctrl_flags" to make it more clear since it indicates the ctrl_flags in rule and you name it as control.flags in the following print message.

Good point, I will rename that argument in v2.

I copied the error message verbatim from sfc.

>                                                     struct
>> +netlink_ext_ack *extack) {
>> +       if (likely((flags & ~supp_flags) == 0))
>> +               return true;
>> +
>> +       NL_SET_ERR_MSG_FMT_MOD(extack,
>> +                              "Unsupported match on control.flags %#x",
>> +                              flags);
>> +
>> +       return false;
>> +}
>> +
>> struct flow_stats {
>>         u64     pkts;
>>         u64     bytes;
>> --
> This should not be included in this patch.

It's the default 3 lines of context, as is default in git format-patch.

-- 
Best regards
Asbjørn Sloth Tønnesen
Network Engineer
Fiberby - AS42541