This is a note to let you know that I've just added the patch titled
net/tg3: Avoid delay during MMIO access
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-tg3-avoid-delay-during-mmio-access.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6d446ec32f169c6a5d9bc90684a8082a6cbe90f6 Mon Sep 17 00:00:00 2001
From: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx>
Date: Tue, 25 Jun 2013 15:24:32 +0800
Subject: net/tg3: Avoid delay during MMIO access
From: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx>
commit 6d446ec32f169c6a5d9bc90684a8082a6cbe90f6 upstream.
When the EEH error is the result of a fenced host bridge, MMIO accesses
can be very slow (milliseconds) to timeout and return all 1's,
thus causing the driver various timeout loops to take way too long and
trigger soft-lockup warnings (in addition to taking minutes to recover).
It might be worthwhile to check if for any of these cases, ffffffff is
a valid possible value, and if not, bail early since that means the HW
is either gone or isolated. In the meantime, checking that the PCI channel
is offline would be workaround of the problem.
Signed-off-by: Gavin Shan <shangw@xxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/broadcom/tg3.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -689,6 +689,9 @@ static int tg3_ape_lock(struct tg3 *tp,
status = tg3_ape_read32(tp, gnt + off);
if (status == bit)
break;
+ if (pci_channel_offline(tp->pdev))
+ break;
+
udelay(10);
}
@@ -1466,6 +1469,9 @@ static void tg3_wait_for_event_ack(struc
for (i = 0; i < delay_cnt; i++) {
if (!(tr32(GRC_RX_CPU_EVENT) & GRC_RX_CPU_DRIVER_EVENT))
break;
+ if (pci_channel_offline(tp->pdev))
+ break;
+
udelay(8);
}
}
@@ -1636,6 +1642,9 @@ static int tg3_poll_fw(struct tg3 *tp)
for (i = 0; i < 200; i++) {
if (tr32(VCPU_STATUS) & VCPU_STATUS_INIT_DONE)
return 0;
+ if (pci_channel_offline(tp->pdev))
+ return -ENODEV;
+
udelay(100);
}
return -ENODEV;
@@ -1646,6 +1655,15 @@ static int tg3_poll_fw(struct tg3 *tp)
tg3_read_mem(tp, NIC_SRAM_FIRMWARE_MBOX, &val);
if (val == ~NIC_SRAM_FIRMWARE_MBOX_MAGIC1)
break;
+ if (pci_channel_offline(tp->pdev)) {
+ if (!tg3_flag(tp, NO_FWARE_REPORTED)) {
+ tg3_flag_set(tp, NO_FWARE_REPORTED);
+ netdev_info(tp->dev, "No firmware running\n");
+ }
+
+ break;
+ }
+
udelay(10);
}
@@ -3204,6 +3222,8 @@ static int tg3_nvram_write_block_buffere
ret = tg3_nvram_exec_cmd(tp, nvram_cmd);
if (ret)
break;
+ if (pci_channel_offline(tp->pdev))
+ return -EBUSY;
}
return ret;
}
@@ -7674,6 +7694,14 @@ static int tg3_stop_block(struct tg3 *tp
tw32_f(ofs, val);
for (i = 0; i < MAX_WAIT_CNT; i++) {
+ if (pci_channel_offline(tp->pdev)) {
+ dev_err(&tp->pdev->dev,
+ "tg3_stop_block device offline, "
+ "ofs=%lx enable_bit=%x\n",
+ ofs, enable_bit);
+ return -ENODEV;
+ }
+
udelay(100);
val = tr32(ofs);
if ((val & enable_bit) == 0)
@@ -7697,6 +7725,13 @@ static int tg3_abort_hw(struct tg3 *tp,
tg3_disable_ints(tp);
+ if (pci_channel_offline(tp->pdev)) {
+ tp->rx_mode &= ~(RX_MODE_ENABLE | TX_MODE_ENABLE);
+ tp->mac_mode &= ~MAC_MODE_TDE_ENABLE;
+ err = -ENODEV;
+ goto err_no_dev;
+ }
+
tp->rx_mode &= ~RX_MODE_ENABLE;
tw32_f(MAC_RX_MODE, tp->rx_mode);
udelay(10);
@@ -7745,6 +7780,7 @@ static int tg3_abort_hw(struct tg3 *tp,
err |= tg3_stop_block(tp, BUFMGR_MODE, BUFMGR_MODE_ENABLE, silent);
err |= tg3_stop_block(tp, MEMARB_MODE, MEMARB_MODE_ENABLE, silent);
+err_no_dev:
for (i = 0; i < tp->irq_cnt; i++) {
struct tg3_napi *tnapi = &tp->napi[i];
if (tnapi->hw_status)
Patches currently in stable-queue which might be from shangw@xxxxxxxxxxxxxxxxxx are
queue-3.4/net-tg3-avoid-delay-during-mmio-access.patch
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