linux-kernel - Re: [BUG] mellanox IB driver fails to load on large config

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Message-ID: <20150721025639.GX58053@asylum.americas.sgi.com>
Date:	Mon, 20 Jul 2015 21:56:39 -0500
From:	Alex Thorlton <athorlton@....com>
To:	Alex Thorlton <athorlton@....com>
Cc:	Or Gerlitz <ogerlitz@...lanox.com>,
	Or Gerlitz <gerlitz.or@...il.com>,
	andrew banman <abanman@....com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Roland Dreier <roland@...estorage.com>,
	Matan Barak <matanb@...lanox.com>,
	Moni Shoua <monis@...lanox.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Yishai Hadas <yishaih@...lanox.com>,
	Eran Ben Elisha <eranbe@...lanox.com>,
	Ira Weiny <ira.weiny@...el.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [BUG] mellanox IB driver fails to load on large config

On Mon, Jul 20, 2015 at 11:28:03AM -0500, Alex Thorlton wrote:
> I've got some time on the large machine later today.  I'll give this a
> try then.

I ran a boot with this patch applied:

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 83e80ab..c84aea0 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -45,7 +45,7 @@
 #include <linux/timecounter.h>

 #define MAX_MSIX_P_PORT                17
-#define MAX_MSIX               64
+#define MAX_MSIX               8192
 #define MSIX_LEGACY_SZ         4
 #define MIN_MSIX_P_PORT                5

I went for a max of 8192, since I was actually booting the machine with
6144 cores (not 4096) for this run.  It doesn't look like this fixed the
problem.  I still saw the same errors during boot.

FWIW, the module does appear to still successfully load:

8<---
# lsmod | grep mlx
mlx4_ib               151552  0
ib_sa                  32768  1 mlx4_ib
ib_mad                 49152  2 ib_sa,mlx4_ib
ib_core               102400  3 ib_sa,mlx4_ib,ib_mad
mlx4_core             278528  1 mlx4_ib
--->8

If the module loading is good enough, and we should just ignore the
errors, then I'm fine with that.  Just wanting to make sure that
everything is behaving correctly.

- Alex
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