From: Tom Tucker <tom-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
To: roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org
Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: MLX4 Cq Question
Date: Fri, 17 May 2013 14:25:44 -0500 [thread overview]
Message-ID: <51968438.7070907@opengridcomputing.com> (raw)
Hi Roland,
I'm looking at the Linux MLX4 net driver and found something that confuses
me mightily. In particular in the file net/ethernet/mellanox/mlx4/cq.c,
the mlx4_ib_completion function does not take any kind of lock when
looking up the SW CQ in the radix tree, however, the mlx4_cq_event
function does. In addition if I go look at the code paths where cq are
removed from this tree, they are protected by spin_lock_irq. So I am
baffled at this point as to what the locking strategy is and how this is
supposed to work. I'm sure I'm missing something and would greatly
appreciate it if someone would explain this.
Thanks,
Tom
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next reply other threads:[~2013-05-17 19:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-17 19:25 Tom Tucker [this message]
[not found] ` <51968438.7070907-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
2013-05-17 21:37 ` MLX4 Cq Question Roland Dreier
[not found] ` <CAG4TOxNi0PxxskqXgxRhMPG0bmr+sS-x0_RG-zKyvLW1LNzoBg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-05-19 6:09 ` Or Gerlitz
2013-05-20 14:53 ` Jack Morgenstein
[not found] ` <201305201753.10806.jackm-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2013-05-20 16:07 ` Roland Dreier
2013-05-20 19:51 ` Tom Tucker
[not found] ` <519A7EB2.8090206-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
2013-05-20 19:58 ` Hefty, Sean
[not found] ` <1828884A29C6694DAF28B7E6B8A823736FD2955D-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2013-05-20 20:10 ` Tom Tucker
2013-05-20 20:11 ` Or Gerlitz
2013-05-21 9:40 ` Or Gerlitz
[not found] ` <519B4104.4090102-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2013-05-21 10:42 ` Bart Van Assche
[not found] ` <519B4F81.9040108-HInyCGIudOg@public.gmane.org>
2013-05-21 10:43 ` Or Gerlitz
[not found] ` <519B4FEB.5090701-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2013-05-21 14:13 ` Jack Morgenstein
[not found] ` <201305211713.24370.jackm-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2013-05-21 15:10 ` Or Gerlitz
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