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: Allow phy reset to be skipped during chip reset.

PATCH Applied Michael Chan 3 participants 3 messages May 16, 2008 – May 17, 2008

Subsystems (2)
Networking Network drivers
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Michael Chan

author
#0 lore raw

PATCH 1/6 : Allow phy reset to be skipped during chip reset.

[BNX2]: Allow phy reset to be skipped during chip reset.

Andy Gospodarek <[email protected]> found that netconsole would panic when resetting bnx2 devices.

Quoted 1 line

From Andy:

"The issue is the bnx2_set_link in bnx2_init_nic will print a link-status message before we are fully initialized and ready to start polling. Polling is currently disabled in this state, but since the __LINK_STATE_RX_SCHED is overloaded to not only try and disable polling but also to make the system aware there is something waiting to be polled, we really have to fix this in drivers.

The problematic call is the one to netif_rx_complete as it tries to remove an entry from the poll_list when there isn't one."

While this netconsole problem should be fixed separately, we really should not reset the PHY when changing ring sizes, MTU, or other similar settings. The PHY reset causes several seconds of unnecessary link disruptions.

Signed-off-by Michael Chan <[email protected]>
Cc Andy Gospodarek <[email protected]>
---
 drivers/net/bnx2.c |   50 +++++++++++++++++++++++++++-----------------------
 1 files changed, 27 insertions(+), 23 deletions(-)
drivers/net/bnx2.c +27 -23
index 4b46e68..934c2bf 100644
@@ -1875,7 +1875,7 @@ bnx2_setup_phy(struct bnx2 *bp, u8 port)
 }
 
 static int
-bnx2_init_5709s_phy(struct bnx2 *bp)
+bnx2_init_5709s_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 

@@ -1890,7 +1890,8 @@ bnx2_init_5709s_phy(struct bnx2 *bp)
 	bnx2_write_phy(bp, MII_BNX2_AER_AER, MII_BNX2_AER_AER_AN_MMD);
 
 	bnx2_write_phy(bp, MII_BNX2_BLK_ADDR, MII_BNX2_BLK_ADDR_COMBO_IEEEB0);
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	bnx2_write_phy(bp, MII_BNX2_BLK_ADDR, MII_BNX2_BLK_ADDR_SERDES_DIG);
 

@@ -1924,11 +1925,12 @@ bnx2_init_5709s_phy(struct bnx2 *bp)
 }
 
 static int
-bnx2_init_5708s_phy(struct bnx2 *bp)
+bnx2_init_5708s_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	bp->mii_up1 = BCM5708S_UP1;
 

@@ -1981,9 +1983,10 @@ bnx2_init_5708s_phy(struct bnx2 *bp)
 }
 
 static int
-bnx2_init_5706s_phy(struct bnx2 *bp)
+bnx2_init_5706s_phy(struct bnx2 *bp, int reset_phy)
 {
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	bp->phy_flags &= ~BNX2_PHY_FLAG_PARALLEL_DETECT;
 

@@ -2018,11 +2021,12 @@ bnx2_init_5706s_phy(struct bnx2 *bp)
 }
 
 static int
-bnx2_init_copper_phy(struct bnx2 *bp)
+bnx2_init_copper_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 
-	bnx2_reset_phy(bp);
+	if (reset_phy)
+		bnx2_reset_phy(bp);
 
 	if (bp->phy_flags & BNX2_PHY_FLAG_CRC_FIX) {
 		bnx2_write_phy(bp, 0x18, 0x0c00);

@@ -2070,7 +2074,7 @@ bnx2_init_copper_phy(struct bnx2 *bp)
 
 
 static int
-bnx2_init_phy(struct bnx2 *bp)
+bnx2_init_phy(struct bnx2 *bp, int reset_phy)
 {
 	u32 val;
 	int rc = 0;

@@ -2096,14 +2100,14 @@ bnx2_init_phy(struct bnx2 *bp)
 
 	if (bp->phy_flags & BNX2_PHY_FLAG_SERDES) {
 		if (CHIP_NUM(bp) == CHIP_NUM_5706)
-			rc = bnx2_init_5706s_phy(bp);
+			rc = bnx2_init_5706s_phy(bp, reset_phy);
 		else if (CHIP_NUM(bp) == CHIP_NUM_5708)
-			rc = bnx2_init_5708s_phy(bp);
+			rc = bnx2_init_5708s_phy(bp, reset_phy);
 		else if (CHIP_NUM(bp) == CHIP_NUM_5709)
-			rc = bnx2_init_5709s_phy(bp);
+			rc = bnx2_init_5709s_phy(bp, reset_phy);
 	}
 	else {
-		rc = bnx2_init_copper_phy(bp);
+		rc = bnx2_init_copper_phy(bp, reset_phy);
 	}
 
 setup_phy:

@@ -4873,7 +4877,7 @@ bnx2_reset_nic(struct bnx2 *bp, u32 reset_code)
 }
 
 static int
-bnx2_init_nic(struct bnx2 *bp)
+bnx2_init_nic(struct bnx2 *bp, int reset_phy)
 {
 	int rc;
 

@@ -4881,7 +4885,7 @@ bnx2_init_nic(struct bnx2 *bp)
 		return rc;
 
 	spin_lock_bh(&bp->phy_lock);
-	bnx2_init_phy(bp);
+	bnx2_init_phy(bp, reset_phy);
 	bnx2_set_link(bp);
 	if (bp->phy_flags & BNX2_PHY_FLAG_REMOTE_PHY_CAP)
 		bnx2_remote_phy_event(bp);

@@ -5269,7 +5273,7 @@ bnx2_test_loopback(struct bnx2 *bp)
 
 	bnx2_reset_nic(bp, BNX2_DRV_MSG_CODE_RESET);
 	spin_lock_bh(&bp->phy_lock);
-	bnx2_init_phy(bp);
+	bnx2_init_phy(bp, 1);
 	spin_unlock_bh(&bp->phy_lock);
 	if (bnx2_run_loopback(bp, BNX2_MAC_LOOPBACK))
 		rc |= BNX2_MAC_LOOPBACK_FAILED;

@@ -5659,7 +5663,7 @@ bnx2_open(struct net_device *dev)
 		return rc;
 	}
 
-	rc = bnx2_init_nic(bp);
+	rc = bnx2_init_nic(bp, 1);
 
 	if (rc) {
 		bnx2_napi_disable(bp);

@@ -5691,7 +5695,7 @@ bnx2_open(struct net_device *dev)
 
 			bnx2_setup_int_mode(bp, 1);
 
-			rc = bnx2_init_nic(bp);
+			rc = bnx2_init_nic(bp, 0);
 
 			if (!rc)
 				rc = bnx2_request_irq(bp);

@@ -5727,7 +5731,7 @@ bnx2_reset_task(struct work_struct *work)
 	bp->in_reset_task = 1;
 	bnx2_netif_stop(bp);
 
-	bnx2_init_nic(bp);
+	bnx2_init_nic(bp, 1);
 
 	atomic_set(&bp->intr_sem, 1);
 	bnx2_netif_start(bp);

@@ -6421,7 +6425,7 @@ bnx2_set_coalesce(struct net_device *dev, struct ethtool_coalesce *coal)
 
 	if (netif_running(bp->dev)) {
 		bnx2_netif_stop(bp);
-		bnx2_init_nic(bp);
+		bnx2_init_nic(bp, 0);
 		bnx2_netif_start(bp);
 	}
 

@@ -6464,7 +6468,7 @@ bnx2_change_ring_size(struct bnx2 *bp, u32 rx, u32 tx)
 		rc = bnx2_alloc_mem(bp);
 		if (rc)
 			return rc;
-		bnx2_init_nic(bp);
+		bnx2_init_nic(bp, 0);
 		bnx2_netif_start(bp);
 	}
 	return 0;

@@ -6732,7 +6736,7 @@ bnx2_self_test(struct net_device *dev, struct ethtool_test *etest, u64 *buf)
 			bnx2_reset_chip(bp, BNX2_DRV_MSG_CODE_RESET);
 		}
 		else {
-			bnx2_init_nic(bp);
+			bnx2_init_nic(bp, 1);
 			bnx2_netif_start(bp);
 		}
 

@@ -7619,7 +7623,7 @@ bnx2_resume(struct pci_dev *pdev)
 
 	bnx2_set_power_state(bp, PCI_D0);
 	netif_device_attach(dev);
-	bnx2_init_nic(bp);
+	bnx2_init_nic(bp, 1);
 	bnx2_netif_start(bp);
 	return 0;
 }
Signature · 1 line
1.5.5.GIT
Acked-by on v1 1/6
#1 lore raw
Quoted 16 lines · Michael Chan

[BNX2]: Allow phy reset to be skipped during chip reset.

Andy Gospodarek <[email protected]> found that netconsole would panic when resetting bnx2 devices.

Quoted 1 line

From Andy:

"The issue is the bnx2_set_link in bnx2_init_nic will print a link-status message before we are fully initialized and ready to start polling. Polling is currently disabled in this state, but since the __LINK_STATE_RX_SCHED is overloaded to not only try and disable polling but also to make the system aware there is something waiting to be polled, we really have to fix this in drivers.

The problematic call is the one to netif_rx_complete as it tries to remove an entry from the poll_list when there isn't one."

Quoted 7 lines

While this netconsole problem should be fixed separately, we really should not reset the PHY when changing ring sizes, MTU, or other similar settings. The PHY reset causes several seconds of unnecessary link disruptions.

Signed-off-by Michael Chan <[email protected]>
Cc Andy Gospodarek <[email protected]>
Acked-by Andy Gospodarek <[email protected]>
maintainer Applied
#2 lore raw

From: Andy Gospodarek <[email protected]>
Date: Fri, 16 May 2008 17:34:30 -0400

Quoted 22 lines · Michael Chan
Quoted 21 lines

[BNX2]: Allow phy reset to be skipped during chip reset.

Andy Gospodarek <[email protected]> found that netconsole would panic when resetting bnx2 devices.

Quoted 1 line

From Andy:

"The issue is the bnx2_set_link in bnx2_init_nic will print a link-status message before we are fully initialized and ready to start polling. Polling is currently disabled in this state, but since the __LINK_STATE_RX_SCHED is overloaded to not only try and disable polling but also to make the system aware there is something waiting to be polled, we really have to fix this in drivers.

The problematic call is the one to netif_rx_complete as it tries to remove an entry from the poll_list when there isn't one."

While this netconsole problem should be fixed separately, we really should not reset the PHY when changing ring sizes, MTU, or other similar settings. The PHY reset causes several seconds of unnecessary link disruptions.

Quoted 4 lines
Quoted 2 lines
Signed-off-by Michael Chan <[email protected]>
Cc Andy Gospodarek <[email protected]>
Acked-by Andy Gospodarek <[email protected]>

Applied, thanks everyone.