linux-kernel - [PATCH 3.14 040/130] bnx2x: Dont notify about scratchpad parities

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Message-Id: <20160301234501.166449911@linuxfoundation.org>
Date:	Tue, 01 Mar 2016 23:51:04 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Manish Chopra <Manish.Chopra@...gic.com>,
	Yuval Mintz <Yuval.Mintz@...gic.com>,
	Ariel Elior <Ariel.Elior@...gic.com>,
	"David S. Miller" <davem@...emloft.net>,
	Patrick Schaaf <netdev@....de>
Subject: [PATCH 3.14 040/130] bnx2x: Dont notify about scratchpad parities

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Manish Chopra <Manish.Chopra@...gic.com>

commit ad6afbe9578d1fa26680faf78c846bd8c00d1d6e upstream.

The scratchpad is a shared block between all functions of a given device.
Due to HW limitations, we can't properly close its parity notifications
to all functions on legal flows.
E.g., it's possible that while taking a register dump from one function
a parity error would be triggered on other functions.

Today driver doesn't consider this parity as a 'real' parity unless its
being accompanied by additional indications [which would happen in a real
parity scenario]; But it does print notifications for such events in the
system logs.

This eliminates such prints - in case of real parities driver would have
additional indications; But if this is the only signal user will not even
see a parity being logged in the system.

Signed-off-by: Manish Chopra <Manish.Chopra@...gic.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@...gic.com>
Signed-off-by: Ariel Elior <Ariel.Elior@...gic.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Patrick Schaaf <netdev@....de>
Tested-by: Patrick Schaaf <netdev@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>


---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x.h      |   11 +++++++----
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c |   20 ++++++++++++++------
 2 files changed, 21 insertions(+), 10 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
@@ -2401,10 +2401,13 @@ void bnx2x_igu_clear_sb_gen(struct bnx2x
 				 AEU_INPUTS_ATTN_BITS_IGU_PARITY_ERROR | \
 				 AEU_INPUTS_ATTN_BITS_MISC_PARITY_ERROR)
 
-#define HW_PRTY_ASSERT_SET_3 (AEU_INPUTS_ATTN_BITS_MCP_LATCHED_ROM_PARITY | \
-		AEU_INPUTS_ATTN_BITS_MCP_LATCHED_UMP_RX_PARITY | \
-		AEU_INPUTS_ATTN_BITS_MCP_LATCHED_UMP_TX_PARITY | \
-		AEU_INPUTS_ATTN_BITS_MCP_LATCHED_SCPAD_PARITY)
+#define HW_PRTY_ASSERT_SET_3_WITHOUT_SCPAD \
+		(AEU_INPUTS_ATTN_BITS_MCP_LATCHED_ROM_PARITY | \
+		 AEU_INPUTS_ATTN_BITS_MCP_LATCHED_UMP_RX_PARITY | \
+		 AEU_INPUTS_ATTN_BITS_MCP_LATCHED_UMP_TX_PARITY)
+
+#define HW_PRTY_ASSERT_SET_3 (HW_PRTY_ASSERT_SET_3_WITHOUT_SCPAD | \
+			      AEU_INPUTS_ATTN_BITS_MCP_LATCHED_SCPAD_PARITY)
 
 #define HW_PRTY_ASSERT_SET_4 (AEU_INPUTS_ATTN_BITS_PGLUE_PARITY_ERROR | \
 			      AEU_INPUTS_ATTN_BITS_ATC_PARITY_ERROR)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -4631,9 +4631,7 @@ static bool bnx2x_check_blocks_with_pari
 				res |= true;
 				break;
 			case AEU_INPUTS_ATTN_BITS_MCP_LATCHED_SCPAD_PARITY:
-				if (print)
-					_print_next_block((*par_num)++,
-							  "MCP SCPAD");
+				(*par_num)++;
 				/* clear latched SCPAD PATIRY from MCP */
 				REG_WR(bp, MISC_REG_AEU_CLR_LATCH_SIGNAL,
 				       1UL << 10);
@@ -4695,6 +4693,7 @@ static bool bnx2x_parity_attn(struct bnx
 	    (sig[3] & HW_PRTY_ASSERT_SET_3) ||
 	    (sig[4] & HW_PRTY_ASSERT_SET_4)) {
 		int par_num = 0;
+
 		DP(NETIF_MSG_HW, "Was parity error: HW block parity attention:\n"
 				 "[0]:0x%08x [1]:0x%08x [2]:0x%08x [3]:0x%08x [4]:0x%08x\n",
 			  sig[0] & HW_PRTY_ASSERT_SET_0,
@@ -4702,9 +4701,18 @@ static bool bnx2x_parity_attn(struct bnx
 			  sig[2] & HW_PRTY_ASSERT_SET_2,
 			  sig[3] & HW_PRTY_ASSERT_SET_3,
 			  sig[4] & HW_PRTY_ASSERT_SET_4);
-		if (print)
-			netdev_err(bp->dev,
-				   "Parity errors detected in blocks: ");
+		if (print) {
+			if (((sig[0] & HW_PRTY_ASSERT_SET_0) ||
+			     (sig[1] & HW_PRTY_ASSERT_SET_1) ||
+			     (sig[2] & HW_PRTY_ASSERT_SET_2) ||
+			     (sig[4] & HW_PRTY_ASSERT_SET_4)) ||
+			     (sig[3] & HW_PRTY_ASSERT_SET_3_WITHOUT_SCPAD)) {
+				netdev_err(bp->dev,
+					   "Parity errors detected in blocks: ");
+			} else {
+				print = false;
+			}
+		}
 		res |= bnx2x_check_blocks_with_parity0(bp,
 			sig[0] & HW_PRTY_ASSERT_SET_0, &par_num, print);
 		res |= bnx2x_check_blocks_with_parity1(bp,