netdev - Re: [PATCH for-next v6 3/7] RDMA/rxe: Register IP mcast address

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Date: Sun, 10 Dec 2023 18:56:26 -0600
From: Bob Pearson <rpearsonhpe@...il.com>
To: David Ahern <dsahern@...nel.org>, jgg@...dia.com, yanjun.zhu@...ux.dev,
 linux-rdma@...r.kernel.org, netdev@...r.kernel.org, rain.1986.08.12@...il.com
Subject: Re: [PATCH for-next v6 3/7] RDMA/rxe: Register IP mcast address



On 12/8/23 09:50, David Ahern wrote:
> On 12/7/23 12:29 PM, Bob Pearson wrote:
>> diff --git a/drivers/infiniband/sw/rxe/rxe_mcast.c b/drivers/infiniband/sw/rxe/rxe_mcast.c
>> index 86cc2e18a7fd..5236761892dd 100644
>> --- a/drivers/infiniband/sw/rxe/rxe_mcast.c
>> +++ b/drivers/infiniband/sw/rxe/rxe_mcast.c
>> @@ -19,38 +19,116 @@
>>    * mcast packets in the rxe receive path.
>>    */
>>   
>> +#include <linux/igmp.h>
>> +
>>   #include "rxe.h"
>>   
>> -/**
>> - * rxe_mcast_add - add multicast address to rxe device
>> - * @rxe: rxe device object
>> - * @mgid: multicast address as a gid
>> - *
>> - * Returns 0 on success else an error
>> - */
>> -static int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
>> +static int rxe_mcast_add6(struct rxe_dev *rxe, union ib_gid *mgid)
>>   {
>> +	struct in6_addr *addr6 = (struct in6_addr *)mgid;
>> +	struct sock *sk = recv_sockets.sk6->sk;
>>   	unsigned char ll_addr[ETH_ALEN];
>> +	int err;
>> +
>> +	lock_sock(sk);
>> +	rtnl_lock();
> 
> reverse the order. rtnl is always taken first, then socket lock.
> 
> Actually, I think it would be better to avoid burying this logic in the
> rxe driver. Can you try using the setsockopt API? I think it is now
> usable within the kernel again after the refactoring for io_uring.
> 
> 
David,

Thanks for looking at this. What is the in kernel setsock api? I'll give 
it a try but I am not sure what to call.

Bob
> 
>