diff mbox

[net-next,5/5] cxgb4: exclude registers with read side effects from register dumps

Message ID 1278885679-3738-6-git-send-email-dm@chelsio.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Dimitris Michailidis July 11, 2010, 10:01 p.m. UTC 
A few registers have side effects on reads, eg FIFO pointers that
auto advance or mailboxes which change ownership when read.  They are
unsafe to read so exclude them from ethtool register dumps.

Signed-off-by: Dimitris Michailidis <dm@chelsio.com>
---
 drivers/net/cxgb4/cxgb4_main.c |   20 +++++++++++---------
 1 files changed, 11 insertions(+), 9 deletions(-)

Comments

Ben Hutchings July 11, 2010, 10:17 p.m. UTC | #1 
On Sun, 2010-07-11 at 15:01 -0700, Dimitris Michailidis wrote:
> A few registers have side effects on reads, eg FIFO pointers that
> auto advance or mailboxes which change ownership when read.  They are
> unsafe to read so exclude them from ethtool register dumps.
[...]

If you change the set of registers in the dump, you need to increment
the version number.

Ben.
David Miller July 12, 2010, 12:03 a.m. UTC | #2 
From: Ben Hutchings <bhutchings@solarflare.com>
Date: Sun, 11 Jul 2010 23:17:06 +0100

> On Sun, 2010-07-11 at 15:01 -0700, Dimitris Michailidis wrote:
>> A few registers have side effects on reads, eg FIFO pointers that
>> auto advance or mailboxes which change ownership when read.  They are
>> unsafe to read so exclude them from ethtool register dumps.
> [...]
> 
> If you change the set of registers in the dump, you need to increment
> the version number.

Agreed.
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diff mbox

Patch

diff --git a/drivers/net/cxgb4/cxgb4_main.c b/drivers/net/cxgb4/cxgb4_main.c
index 110843c..d3a486b 100644
--- a/drivers/net/cxgb4/cxgb4_main.c
+++ b/drivers/net/cxgb4/cxgb4_main.c
@@ -1128,7 +1128,9 @@  static void get_regs(struct net_device *dev, struct ethtool_regs *regs,
 		0xdfc0, 0xdfe0,
 		0xe000, 0xea7c,
 		0xf000, 0x11190,
-		0x19040, 0x19124,
+		0x19040, 0x1906c,
+		0x19078, 0x19080,
+		0x1908c, 0x19124,
 		0x19150, 0x191b0,
 		0x191d0, 0x191e8,
 		0x19238, 0x1924c,
@@ -1141,49 +1143,49 @@  static void get_regs(struct net_device *dev, struct ethtool_regs *regs,
 		0x1a190, 0x1a1c4,
 		0x1a1fc, 0x1a1fc,
 		0x1e040, 0x1e04c,
-		0x1e240, 0x1e28c,
+		0x1e284, 0x1e28c,
 		0x1e2c0, 0x1e2c0,
 		0x1e2e0, 0x1e2e0,
 		0x1e300, 0x1e384,
 		0x1e3c0, 0x1e3c8,
 		0x1e440, 0x1e44c,
-		0x1e640, 0x1e68c,
+		0x1e684, 0x1e68c,
 		0x1e6c0, 0x1e6c0,
 		0x1e6e0, 0x1e6e0,
 		0x1e700, 0x1e784,
 		0x1e7c0, 0x1e7c8,
 		0x1e840, 0x1e84c,
-		0x1ea40, 0x1ea8c,
+		0x1ea84, 0x1ea8c,
 		0x1eac0, 0x1eac0,
 		0x1eae0, 0x1eae0,
 		0x1eb00, 0x1eb84,
 		0x1ebc0, 0x1ebc8,
 		0x1ec40, 0x1ec4c,
-		0x1ee40, 0x1ee8c,
+		0x1ee84, 0x1ee8c,
 		0x1eec0, 0x1eec0,
 		0x1eee0, 0x1eee0,
 		0x1ef00, 0x1ef84,
 		0x1efc0, 0x1efc8,
 		0x1f040, 0x1f04c,
-		0x1f240, 0x1f28c,
+		0x1f284, 0x1f28c,
 		0x1f2c0, 0x1f2c0,
 		0x1f2e0, 0x1f2e0,
 		0x1f300, 0x1f384,
 		0x1f3c0, 0x1f3c8,
 		0x1f440, 0x1f44c,
-		0x1f640, 0x1f68c,
+		0x1f684, 0x1f68c,
 		0x1f6c0, 0x1f6c0,
 		0x1f6e0, 0x1f6e0,
 		0x1f700, 0x1f784,
 		0x1f7c0, 0x1f7c8,
 		0x1f840, 0x1f84c,
-		0x1fa40, 0x1fa8c,
+		0x1fa84, 0x1fa8c,
 		0x1fac0, 0x1fac0,
 		0x1fae0, 0x1fae0,
 		0x1fb00, 0x1fb84,
 		0x1fbc0, 0x1fbc8,
 		0x1fc40, 0x1fc4c,
-		0x1fe40, 0x1fe8c,
+		0x1fe84, 0x1fe8c,
 		0x1fec0, 0x1fec0,
 		0x1fee0, 0x1fee0,
 		0x1ff00, 0x1ff84,