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Date: Mon, 6 Aug 2007 05:33:40 -0400 (EDT)
From: Sivakumar Subramani <Sivakumar.Subramani@...erion.com>
To: netdev@...r.kernel.org, jeff@...zik.org
cc: support@...erion.com
Subject: [PATCH 2.6.23 1/3]S2IO: Making MSIX as default intr_type
- Making MSIX as default intr_type
- Driver will test MSI-X by issuing test MSI-X vector and if fails it will
fallback to INTA
Signed-off-by: Sivakumar Subramani <sivakumar.subramani@...erion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@...erion.com>
---
diff -urpN org/drivers/net/s2io.c patch1/drivers/net/s2io.c
--- org/drivers/net/s2io.c 2007-07-31 10:50:04.000000000 +0530
+++ patch1/drivers/net/s2io.c 2007-07-31 11:04:50.000000000 +0530
@@ -37,7 +37,7 @@
* tx_fifo_len: This too is an array of 8. Each element defines the number of
* Tx descriptors that can be associated with each corresponding FIFO.
* intr_type: This defines the type of interrupt. The values can be 0(INTA),
- * 2(MSI_X). Default value is '0(INTA)'
+ * 2(MSI_X). Default value is '2(MSI_X)'
* lro: Specifies whether to enable Large Receive Offload (LRO) or not.
* Possible values '1' for enable '0' for disable. Default is '0'
* lro_max_pkts: This parameter defines maximum number of packets can be
@@ -428,7 +428,7 @@ S2IO_PARM_INT(l3l4hdr_size, 128);
/* Frequency of Rx desc syncs expressed as power of 2 */
S2IO_PARM_INT(rxsync_frequency, 3);
/* Interrupt type. Values can be 0(INTA), 2(MSI_X) */
-S2IO_PARM_INT(intr_type, 0);
+S2IO_PARM_INT(intr_type, 2);
/* Large receive offload feature */
S2IO_PARM_INT(lro, 0);
/* Max pkts to be aggregated by LRO at one time. If not specified,
@@ -3781,6 +3781,59 @@ static int s2io_enable_msi_x(struct s2io
return 0;
}
+/* Handle software interrupt used during MSI(X) test */
+static irqreturn_t __devinit s2io_test_intr(int irq, void *dev_id)
+{
+ struct s2io_nic *sp = dev_id;
+
+ sp->msi_detected = 1;
+ wake_up(&sp->msi_wait);
+
+ return IRQ_HANDLED;
+}
+
+/* Test interrupt path by forcing a a software IRQ */
+static int __devinit s2io_test_msi(struct s2io_nic *sp)
+{
+ struct pci_dev *pdev = sp->pdev;
+ struct XENA_dev_config __iomem *bar0 = sp->bar0;
+ int err;
+ u64 val64, saved64;
+
+ err = request_irq(sp->entries[1].vector, s2io_test_intr, 0,
+ sp->name, sp);
+ if (err) {
+ DBG_PRINT(ERR_DBG, "%s: PCI %s: cannot assign irq %d\n",
+ sp->dev->name, pci_name(pdev), pdev->irq);
+ return err;
+ }
+
+ init_waitqueue_head (&sp->msi_wait);
+ sp->msi_detected = 0;
+
+ saved64 = val64 = readq(&bar0->scheduled_int_ctrl);
+ val64 |= SCHED_INT_CTRL_ONE_SHOT;
+ val64 |= SCHED_INT_CTRL_TIMER_EN;
+ val64 |= SCHED_INT_CTRL_INT2MSI(1);
+ writeq(val64, &bar0->scheduled_int_ctrl);
+
+ wait_event_timeout(sp->msi_wait, sp->msi_detected, HZ/10);
+
+ if (!sp->msi_detected) {
+ /* MSI(X) test failed, go back to INTx mode */
+ DBG_PRINT(ERR_DBG, "%s: PCI %s: No interrupt was generated"
+ "using MSI(X) during test\n", sp->dev->name,
+ pci_name(pdev));
+
+ err = -EOPNOTSUPP;
+ }
+
+ free_irq(sp->entries[1].vector, sp);
+
+ writeq(saved64, &bar0->scheduled_int_ctrl);
+
+ return err;
+}
/* ********************************************************* *
* Functions defined below concern the OS part of the driver *
* ********************************************************* */
@@ -3809,6 +3862,42 @@ static int s2io_open(struct net_device *
netif_carrier_off(dev);
sp->last_link_state = 0;
+ if (sp->intr_type == MSI_X) {
+ int ret = s2io_enable_msi_x(sp);
+
+ if (!ret) {
+ u16 msi_control;
+
+ ret = s2io_test_msi(sp);
+
+ /* rollback MSI-X, will re-enable during add_isr() */
+ kfree(sp->entries);
+ sp->mac_control.stats_info->sw_stat.mem_freed +=
+ (MAX_REQUESTED_MSI_X *
+ sizeof(struct msix_entry));
+ kfree(sp->s2io_entries);
+ sp->mac_control.stats_info->sw_stat.mem_freed +=
+ (MAX_REQUESTED_MSI_X *
+ sizeof(struct s2io_msix_entry));
+ sp->entries = NULL;
+ sp->s2io_entries = NULL;
+
+ pci_read_config_word(sp->pdev, 0x42, &msi_control);
+ msi_control &= 0xFFFE; /* Disable MSI */
+ pci_write_config_word(sp->pdev, 0x42, msi_control);
+
+ pci_disable_msix(sp->pdev);
+
+ }
+ if (ret) {
+
+ DBG_PRINT(ERR_DBG,
+ "%s: MSI-X requested but failed to enable\n",
+ dev->name);
+ sp->intr_type = INTA;
+ }
+ }
+
/* Initialize H/W and enable interrupts */
err = s2io_card_up(sp);
if (err) {
diff -urpN org/drivers/net/s2io.h patch1/drivers/net/s2io.h
--- org/drivers/net/s2io.h 2007-07-31 10:50:04.000000000 +0530
+++ patch1/drivers/net/s2io.h 2007-07-31 10:47:06.000000000 +0530
@@ -412,6 +412,10 @@ struct config_param {
struct tx_fifo_config tx_cfg[MAX_TX_FIFOS]; /*Per-Tx FIFO config */
u32 max_txds; /*Max no. of Tx buffer descriptor per TxDL */
u64 tx_intr_type;
+#define INTA 0
+#define MSI_X 2
+ u8 intr_type;
+
/* Specifies if Tx Intr is UTILZ or PER_LIST type. */
/* Rx Side */
@@ -861,6 +865,8 @@ struct s2io_nic {
struct vlan_group *vlgrp;
#define MSIX_FLG 0xA5
struct msix_entry *entries;
+ int msi_detected;
+ wait_queue_head_t msi_wait;
struct s2io_msix_entry *s2io_entries;
char desc[MAX_REQUESTED_MSI_X][25];
diff -urpN org/drivers/net/s2io-regs.h patch1/drivers/net/s2io-regs.h
--- org/drivers/net/s2io-regs.h 2007-07-31 10:50:04.000000000 +0530
+++ patch1/drivers/net/s2io-regs.h 2007-07-31 10:47:32.000000000 +0530
@@ -220,7 +220,7 @@ struct XENA_dev_config {
u64 scheduled_int_ctrl;
#define SCHED_INT_CTRL_TIMER_EN BIT(0)
#define SCHED_INT_CTRL_ONE_SHOT BIT(1)
-#define SCHED_INT_CTRL_INT2MSI TBD
+#define SCHED_INT_CTRL_INT2MSI(val) vBIT(val,10,6)
#define SCHED_INT_PERIOD TBD
u64 txreqtimeout;
-
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