netdev - [PATCH net 1/6] bnx2x: Prevent mistaken hangup between driver & FW

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Date:	Mon, 23 Sep 2013 10:12:50 +0300
From:	"Yuval Mintz" <yuvalmin@...adcom.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
cc:	ariele@...adcom.com, eilong@...adcom.com,
	"Yuval Mintz" <yuvalmin@...adcom.com>
Subject: [PATCH net 1/6] bnx2x: Prevent mistaken hangup between driver &
 FW

From: Eilon Greenstein <eilong@...adcom.com>

When system CPU is stressed it's possible that the driver will not be able
to pulse the FW every second, which will cause the log to be filled with
error messages.

Increasing the threshold to 5 seconds seems to be enough to eliminate the
issue.

Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
Signed-off-by: Yuval Mintz <yuvalmin@...adcom.com>
Signed-off-by: Ariel Elior <ariele@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index a6704b5..f403c6b 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -5447,26 +5447,24 @@ static void bnx2x_timer(unsigned long data)
 	if (IS_PF(bp) &&
 	    !BP_NOMCP(bp)) {
 		int mb_idx = BP_FW_MB_IDX(bp);
-		u32 drv_pulse;
-		u32 mcp_pulse;
+		u16 drv_pulse;
+		u16 mcp_pulse;
 
 		++bp->fw_drv_pulse_wr_seq;
 		bp->fw_drv_pulse_wr_seq &= DRV_PULSE_SEQ_MASK;
-		/* TBD - add SYSTEM_TIME */
 		drv_pulse = bp->fw_drv_pulse_wr_seq;
 		bnx2x_drv_pulse(bp);
 
 		mcp_pulse = (SHMEM_RD(bp, func_mb[mb_idx].mcp_pulse_mb) &
 			     MCP_PULSE_SEQ_MASK);
 		/* The delta between driver pulse and mcp response
-		 * should be 1 (before mcp response) or 0 (after mcp response)
+		 * should not get too big. If the MFW is more than 5 pulses
+		 * behind, we should worry about it enough to generate an error
+		 * log.
 		 */
-		if ((drv_pulse != mcp_pulse) &&
-		    (drv_pulse != ((mcp_pulse + 1) & MCP_PULSE_SEQ_MASK))) {
-			/* someone lost a heartbeat... */
-			BNX2X_ERR("drv_pulse (0x%x) != mcp_pulse (0x%x)\n",
+		if (((drv_pulse - mcp_pulse) & MCP_PULSE_SEQ_MASK) > 5)
+			BNX2X_ERR("MFW seems hanged: drv_pulse (0x%x) != mcp_pulse (0x%x)\n",
 				  drv_pulse, mcp_pulse);
-		}
 	}
 
 	if (bp->state == BNX2X_STATE_OPEN)
-- 
1.8.1.4


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