netdev - Re: [PATCH for-next v5 0/7] RDMA/rxe: Make multicast work

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Date: Tue, 5 Dec 2023 13:50:25 +0800
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Bob Pearson <rpearsonhpe@...il.com>, jgg@...dia.com,
 linux-rdma@...r.kernel.org, dsahern@...nel.org,
 "davem@...emloft.net" <davem@...emloft.net>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH for-next v5 0/7] RDMA/rxe: Make multicast work

Add  David S. Miller and  David Ahern.

They are the maintainers in netdev and very familiar with mcast.

Zhu Yanjun

在 2023/12/5 8:23, Bob Pearson 写道:
> After developing a test program which exercises node to node
> testing of RoCE multicast it became clear that there are a
> number of issues with the current rdma_rxe multicast implementation.
>
> The issues seen include:
> 	- There is no support for IPV4 multicast addresses.
> 	- Once a multicast MAC is added it is not removed.
> 	- Multicast packets are sent with the wrong QP number.
> 	- Multicast IP addresses are not created and without
> 	  them no multicast packets received on the interface
> 	  are delivered to the rdma_rxe driver.
> 	- The implementation in rxe_mcast.c is potentially
> 	  racy if multiple simultaneous attach/detach operations
> 	  are issued.
>
> This patch set fixes these issues.
> ---
> v5:
>    Missed previous fix in error path. Add sock lock around
>    ipv6_sock_mm_drop() in rxe_mcast_add6().
> v4:
>    Corrected a lockdep bug reported by Zhu Yanjun.
> v3:
>    Removed rxe_loop_and_send(). It turns out it is not needed.
>    Added module parameters to set mcast limits to small values when
>    driver is loaded to enable mcast limit testing.
>    Rebased to current for-next branch.
> v2:
>    Respond to comments by Zhu.
>    Added more Fixes lines.
>    Added some more explanation in the commit messages.
>    Fixed an error in rxe_lookup_mcg. Should have checked
> 	the return from rxe_get_mcg().
>
> Bob Pearson (7):
>    RDMA/rxe: Cleanup rxe_ah/av_chk_attr
>    RDMA/rxe: Fix sending of mcast packets
>    RDMA/rxe: Register IP mcast address
>    RDMA/rxe: Let rxe_lookup_mcg use rcu_read_lock
>    RDMA/rxe: Split multicast lock
>    RDMA/rxe: Cleanup mcg lifetime
>    RDMA/rxe: Add module parameters for mcast limits
>
>   drivers/infiniband/sw/rxe/Makefile     |   3 +-
>   drivers/infiniband/sw/rxe/rxe.c        |   8 +-
>   drivers/infiniband/sw/rxe/rxe_av.c     |  50 +--
>   drivers/infiniband/sw/rxe/rxe_loc.h    |   6 +-
>   drivers/infiniband/sw/rxe/rxe_mcast.c  | 526 +++++++++++--------------
>   drivers/infiniband/sw/rxe/rxe_net.c    |   6 +-
>   drivers/infiniband/sw/rxe/rxe_net.h    |   1 +
>   drivers/infiniband/sw/rxe/rxe_opcode.h |   2 +-
>   drivers/infiniband/sw/rxe/rxe_param.c  |  23 ++
>   drivers/infiniband/sw/rxe/rxe_param.h  |   4 +
>   drivers/infiniband/sw/rxe/rxe_qp.c     |   4 +-
>   drivers/infiniband/sw/rxe/rxe_recv.c   |  11 +-
>   drivers/infiniband/sw/rxe/rxe_req.c    |  11 +-
>   drivers/infiniband/sw/rxe/rxe_verbs.c  |   5 +-
>   drivers/infiniband/sw/rxe/rxe_verbs.h  |   5 +-
>   15 files changed, 305 insertions(+), 360 deletions(-)
>   create mode 100644 drivers/infiniband/sw/rxe/rxe_param.c
>