linux-kernel - Re: [PATCH net-next] net/packet: Add getsockopt support for PACKET_COPY

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Message-ID:
 <AM6PR03MB58489E6E890BA4A20D429DDC99272@AM6PR03MB5848.eurprd03.prod.outlook.com>
Date: Fri, 8 Mar 2024 20:08:01 +0800
From: Juntong Deng <juntong.deng@...look.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net/packet: Add getsockopt support for
 PACKET_COPY_THRESH

On 2024/3/8 19:43, Willem de Bruijn wrote:
> Juntong Deng wrote:
>> Currently getsockopt does not support PACKET_COPY_THRESH,
>> and we are unable to get the value of PACKET_COPY_THRESH
>> socket option through getsockopt.
>>
>> This patch adds getsockopt support for PACKET_COPY_THRESH.
>>
>> Signed-off-by: Juntong Deng <juntong.deng@...look.com>
>> ---
>>   net/packet/af_packet.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
>> index 0db31ca4982d..65042edd1a97 100644
>> --- a/net/packet/af_packet.c
>> +++ b/net/packet/af_packet.c
>> @@ -4090,6 +4090,9 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
>>   	case PACKET_VNET_HDR_SZ:
>>   		val = READ_ONCE(po->vnet_hdr_sz);
>>   		break;
>> +	case PACKET_COPY_THRESH:
>> +		val = pkt_sk(sk)->copy_thresh;
>> +		break;
> 
> This is probably a good opportunity to use READ_ONCE/WRITE_ONCE for
> this variable that can be modified and read concurrently.
> 
> Alternatively I can fix up all three locations in a follow-on patch.
> 
> No concerns with adding the getsockopt itself.
> 
>>   	case PACKET_VERSION:
>>   		val = po->tp_version;
>>   		break;
>> -- 
>> 2.39.2
>>
> 
> 

Thanks for reviewing.

So, do I need to send PATCH V2 to add READ_ONCE?

Or do you want you to use a follow-on patch to fix all three locations 
at once?