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[PATCH] S2io: MSI/MSI-X support (runtime configurable)

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This patch adds support for MSI/MSI-X feature to the driver.  It is
a runtime parameter(for now, loadable parameter).  Default is INTA.

Patch has been tested on IA64 platform with Xframe II adapter,
both of which support MSI-X feature.  An improvement of about 7%
in throughput(both Tx and Rx) was observed and a reduction by 7%
in CPU utilization during Tx test.

Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Ravinandan Arakali
2005-10-04 06:41:24 -04:00
committed by Jeff Garzik
parent d9e34325fd
commit cc6e7c44f4
2 changed files with 556 additions and 37 deletions
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drivers/net/s2io.c
+511 -32
View File
File diff suppressed because it is too large Load Diff
drivers/net/s2io.h
+45 -5
View File
@@ -652,6 +652,30 @@ typedef struct {
#define SMALL_BLK_CNT 30
#define LARGE_BLK_CNT 100
/*
* Structure to keep track of the MSI-X vectors and the corresponding
* argument registered against each vector
*/
#define MAX_REQUESTED_MSI_X 17
struct s2io_msix_entry
{
u16 vector;
u16 entry;
void *arg;
u8 type;
#define MSIX_FIFO_TYPE 1
#define MSIX_RING_TYPE 2
u8 in_use;
#define MSIX_REGISTERED_SUCCESS 0xAA
};
struct msix_info_st {
u64 addr;
u64 data;
};
/* Structure representing one instance of the NIC */
struct s2io_nic {
#ifdef CONFIG_S2IO_NAPI
@@ -719,13 +743,8 @@ struct s2io_nic {
* a schedule task that will set the correct Link state once the
* NIC's PHY has stabilized after a state change.
*/
#ifdef INIT_TQUEUE
struct tq_struct rst_timer_task;
struct tq_struct set_link_task;
#else
struct work_struct rst_timer_task;
struct work_struct set_link_task;
#endif
/* Flag that can be used to turn on or turn off the Rx checksum
* offload feature.
@@ -748,10 +767,23 @@ struct s2io_nic {
atomic_t card_state;
volatile unsigned long link_state;
struct vlan_group *vlgrp;
#define MSIX_FLG 0xA5
struct msix_entry *entries;
struct s2io_msix_entry *s2io_entries;
char desc1[35];
char desc2[35];
struct msix_info_st msix_info[0x3f];
#define XFRAME_I_DEVICE 1
#define XFRAME_II_DEVICE 2
u8 device_type;
#define INTA 0
#define MSI 1
#define MSI_X 2
u8 intr_type;
spinlock_t rx_lock;
atomic_t isr_cnt;
};
@@ -886,6 +918,13 @@ static int s2io_poll(struct net_device *dev, int *budget);
static void s2io_init_pci(nic_t * sp);
int s2io_set_mac_addr(struct net_device *dev, u8 * addr);
static void s2io_alarm_handle(unsigned long data);
static int s2io_enable_msi(nic_t *nic);
static irqreturn_t s2io_msi_handle(int irq, void *dev_id, struct pt_regs *regs);
static irqreturn_t
s2io_msix_ring_handle(int irq, void *dev_id, struct pt_regs *regs);
static irqreturn_t
s2io_msix_fifo_handle(int irq, void *dev_id, struct pt_regs *regs);
int s2io_enable_msi_x(nic_t *nic);
static irqreturn_t s2io_isr(int irq, void *dev_id, struct pt_regs *regs);
static int verify_xena_quiescence(nic_t *sp, u64 val64, int flag);
static struct ethtool_ops netdev_ethtool_ops;
@@ -894,4 +933,5 @@ int s2io_set_swapper(nic_t * sp);
static void s2io_card_down(nic_t *nic);
static int s2io_card_up(nic_t *nic);
int get_xena_rev_id(struct pci_dev *pdev);
void restore_xmsi_data(nic_t *nic);
#endif /* _S2IO_H */