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Message-ID: <78C9135A3D2ECE4B8162EBDCE82CAD77DC1C9B@nekter>
Date: Wed, 25 Oct 2006 02:29:33 -0400
From: "Ananda Raju" <Ananda.Raju@...erion.com>
To: "Linas Vepstas" <linas@...tin.ibm.com>,
"Wen Xiong" <wenxiong@...ibm.com>
Cc: <linux-kernel@...r.kernel.org>,
<linux-pci@...ey.karlin.mff.cuni.cz>, <netdev@...r.kernel.org>,
"Jeff Garzik" <jgarzik@...ox.com>, "Andrew Morton" <akpm@...l.org>
Subject: RE: [PATCH] s2io: add PCI error recovery support
Hi,
s2io_card_down() will do few BAR0 read/write. As per
pci-error-recovery.txt Documentation we are not supposed to do any new
IO in error_detected().
Can you try using
atomic_set(&sp->card_state, CARD_DOWN);
instead of s2io_card_down().
Also we have to add following if statement in beginning of s2io_isr().
if (atomic_read(&nic->card_state) == CARD_DOWN)
return IRQ_NOTHANDLED.
If it is ok to do BAR0 read/write in error_detected() then patch is OK.
Ananda
-----Original Message-----
From: Linas Vepstas [mailto:linas@...tin.ibm.com]
Sent: Tuesday, October 24, 2006 2:55 PM
To: Raghavendra Koushik; Ananda Raju; Wen Xiong
Cc: linux-kernel@...r.kernel.org; linux-pci@...ey.karlin.mff.cuni.cz;
netdev@...r.kernel.org; Jeff Garzik; Andrew Morton
Subject: [PATCH] s2io: add PCI error recovery support
Koushik, Raju,
Please review, comment, and if you find this acceptable,
please forward upstream.
--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@...tin.ibm.com>
Cc: Raghavendra Koushik <raghavendra.koushik@...erion.com>
Cc: Ananda Raju <Ananda.Raju@...erion.com>
Cc: Wen Xiong <wenxiong@...ibm.com>
----
drivers/net/s2io.c | 77
+++++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/net/s2io.h | 5 +++
2 files changed, 82 insertions(+)
Index: linux-2.6.19-rc1-git11/drivers/net/s2io.c
===================================================================
--- linux-2.6.19-rc1-git11.orig/drivers/net/s2io.c 2006-10-20
12:24:17.000000000 -0500
+++ linux-2.6.19-rc1-git11/drivers/net/s2io.c 2006-10-24
16:19:49.000000000 -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(). */
@@ -7564,3 +7571,73 @@ 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)) {
+ /* Reset card */
+ s2io_card_down(sp);
+ 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 2006-10-20
12:24:17.000000000 -0500
+++ linux-2.6.19-rc1-git11/drivers/net/s2io.h 2006-10-20
12:41:39.000000000 -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
-
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