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[S2IO]: Making MSIX as default intr_type

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- 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@neterion.com>
Signed-off-by: Ramkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sivakumar Subramani 2007-09-15 13:11:34 -07:00 committed by David S. Miller
parent 28006c65a7
commit 8abc4d5b84
3 changed files with 98 additions and 3 deletions
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2
drivers/net/s2io-regs.h
View File

@ -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;

93
drivers/net/s2io.c
View File

@ -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,
@ -3773,6 +3773,59 @@ static int s2io_enable_msi_x(struct s2io_nic *nic)
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 *
* ********************************************************* */
@ -3803,6 +3856,42 @@ static int s2io_open(struct net_device *dev)
napi_enable(&sp->napi);
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) {

6
drivers/net/s2io.h
View File

@ -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 */
@ -862,6 +866,8 @@ 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];