lkml.org 
[lkml]   [2006]   [Oct]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRE: [PATCH] s2io: add PCI error recovery support
Date
From
Hi, 
Can you try attached patch. The attached patch is simple. We set card
state as down in error_detecct() so that all entry points return error
and don't proceed further.

In slot_reset() we do s2io_card_down() will reset adapter.
In io_resume() we bringup the driver.

Ananda

-----Original Message-----
From: Linas Vepstas [mailto:linas@austin.ibm.com]
Sent: Wednesday, October 25, 2006 1:55 PM
To: Ananda Raju
Cc: Wen Xiong; linux-kernel@vger.kernel.org;
linux-pci@atrey.karlin.mff.cuni.cz; netdev@vger.kernel.org; Jeff Garzik;
Andrew Morton
Subject: Re: [PATCH] s2io: add PCI error recovery support

On Wed, Oct 25, 2006 at 10:11:24AM -0500, Linas Vepstas wrote:
>
> > Also we have to add following if statement in beginning of
s2io_isr().

Done, below,

> > If it is ok to do BAR0 read/write in error_detected() then patch is
OK.

I re-wrote that section to avoid doing I/O. It seems to work well,
and generates a few less messages in the process. New, improved patch
below, please ack and send upstream if you like it.

--linas

This patch adds PCI error recovery support to the
s2io 10-Gigabit ethernet device driver.

Tested, seems to work well.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: Raghavendra Koushik <raghavendra.koushik@neterion.com>
Cc: Ananda Raju <Ananda.Raju@neterion.com>
Cc: Wen Xiong <wenxiong@us.ibm.com>

----
drivers/net/s2io.c | 103
+++++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/net/s2io.h | 5 ++
2 files changed, 108 insertions(+)

Index: linux-2.6.19-rc1-git11/drivers/net/s2io.c
===================================================================
--- linux-2.6.19-rc1-git11.orig/drivers/net/s2io.c 2006-10-25
14:09:47.000000000 -0500
+++ linux-2.6.19-rc1-git11/drivers/net/s2io.c 2006-10-25
15:18:25.000000000 -0500
@@ -434,11 +434,18 @@ static struct pci_device_id s2io_tbl[] _

MODULE_DEVICE_TABLE(pci, s2io_tbl);

+static struct pci_error_handlers s2io_err_handler = {
+ .error_detected = s2io_io_error_detected,
+ .slot_reset = s2io_io_slot_reset,
+ .resume = s2io_io_resume,
+};
+
static struct pci_driver s2io_driver = {
.name = "S2IO",
.id_table = s2io_tbl,
.probe = s2io_init_nic,
.remove = __devexit_p(s2io_rem_nic),
+ .err_handler = &s2io_err_handler,
};

/* A simplifier macro used both by init and free shared_mem Fns(). */
@@ -4171,6 +4178,11 @@ static irqreturn_t s2io_isr(int irq, voi
mac_info_t *mac_control;
struct config_param *config;

+ if ((sp->pdev->error_state != pci_channel_io_normal) &&
+ (sp->pdev->error_state != 0)) {
+ return IRQ_HANDLED;
+ }
+
atomic_inc(&sp->isr_cnt);
mac_control = &sp->mac_control;
config = &sp->config;
@@ -7564,3 +7576,94 @@ static void lro_append_pkt(nic_t *sp, lr
sp->mac_control.stats_info->sw_stat.clubbed_frms_cnt++;
return;
}
+
+/**
+ * s2io_io_error_detected - called when PCI error is detected
+ * @pdev: Pointer to PCI device
+ * @state: The current pci conneection state
+ *
+ * This function is called after a PCI bus error affecting
+ * this device has been detected.
+ */
+static pci_ers_result_t s2io_io_error_detected(struct pci_dev *pdev,
pci_channel_state_t state)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ nic_t *sp = netdev->priv;
+
+ netif_device_detach(netdev);
+
+ if (netif_running(netdev)) {
+ unsigned long flags;
+
+ /* The folowing is an abreviated subset of the
+ * steps taken by s2io_card_down(), avoiding
+ * steps that touch the card itself.
+ */
+ del_timer_sync(&sp->alarm_timer);
+ atomic_set(&sp->card_state, CARD_DOWN);
+
+ /* Kill tasklet. */
+ tasklet_kill(&sp->task);
+
+ /* Free all Tx buffers */
+ spin_lock_irqsave(&sp->tx_lock, flags);
+ free_tx_buffers(sp);
+ spin_unlock_irqrestore(&sp->tx_lock, flags);
+
+ /* Free all Rx buffers */
+ spin_lock_irqsave(&sp->rx_lock, flags);
+ free_rx_buffers(sp);
+ spin_unlock_irqrestore(&sp->rx_lock, flags);
+
+ clear_bit(0, &(sp->link_state));
+ sp->device_close_flag = TRUE; /* Device is shut down.
*/
+ }
+ pci_disable_device(pdev);
+
+ return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * s2io_io_slot_reset - called after the pci bus has been reset.
+ * @pdev: Pointer to PCI device
+ *
+ * Restart the card from scratch, as if from a cold-boot.
+ */
+static pci_ers_result_t s2io_io_slot_reset(struct pci_dev *pdev)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ nic_t *sp = netdev->priv;
+
+ if (pci_enable_device(pdev)) {
+ printk(KERN_ERR "s2io: Cannot re-enable PCI device after
reset.\n");
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+
+ pci_set_master(pdev);
+ s2io_reset(sp);
+
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * s2io_io_resume - called when traffic can start flowing again.
+ * @pdev: Pointer to PCI device
+ *
+ * This callback is called when the error recovery driver tells us that
+ * its OK to resume normal operation.
+ */
+static void s2io_io_resume(struct pci_dev *pdev)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ nic_t *sp = netdev->priv;
+
+ if (netif_running(netdev)) {
+ if (s2io_card_up(sp)) {
+ printk(KERN_ERR "s2io: can't bring device back
up after reset\n");
+ return;
+ }
+ }
+
+ netif_device_attach(netdev);
+ netif_wake_queue(netdev);
+}
Index: linux-2.6.19-rc1-git11/drivers/net/s2io.h
===================================================================
--- linux-2.6.19-rc1-git11.orig/drivers/net/s2io.h 2006-10-25
14:09:47.000000000 -0500
+++ linux-2.6.19-rc1-git11/drivers/net/s2io.h 2006-10-25
14:11:05.000000000 -0500
@@ -1013,6 +1013,11 @@ static void queue_rx_frame(struct sk_buf
static void update_L3L4_header(nic_t *sp, lro_t *lro);
static void lro_append_pkt(nic_t *sp, lro_t *lro, struct sk_buff *skb,
u32 tcp_len);

+static pci_ers_result_t s2io_io_error_detected(struct pci_dev *pdev,
+ pci_channel_state_t
state);
+static pci_ers_result_t s2io_io_slot_reset(struct pci_dev *pdev);
+static void s2io_io_resume(struct pci_dev *pdev);
+
#define s2io_tcp_mss(skb) skb_shinfo(skb)->gso_size
#define s2io_udp_mss(skb) skb_shinfo(skb)->gso_size
#define s2io_offload_type(skb) skb_shinfo(skb)->gso_type
[unhandled content-type:application/octet-stream]
\
 
 \ /
  Last update: 2006-10-26 12:01    [W:0.035 / U:15.776 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site