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RDMA/nes: Fix SFP+ link down detection issue with switch port disable

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In case of SFP+ PHY, link status check at interrupt processing can
give false results.  For proper link status change detection a delayed
recheck is needed to give nes registers time to settle.  Add a
periodic link status recheck scheduled at interrupt to detect
potential delayed registers state changes.

Addresses: http://bugs.openfabrics.org/bugzilla/show_bug.cgi?id=2117
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Maciej Sosnowski 2010-11-24 17:29:46 +00:00 committed by Roland Dreier
parent ea623455b7
commit 5f61b2c693
4 changed files with 100 additions and 0 deletions
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11
drivers/infiniband/hw/nes/nes.c
View file

@ -674,6 +674,8 @@ static int __devinit nes_probe(struct pci_dev *pcidev, const struct pci_device_i
}
nes_notifiers_registered++;
INIT_DELAYED_WORK(&nesdev->work, nes_recheck_link_status);
/* Initialize network devices */
if ((netdev = nes_netdev_init(nesdev, mmio_regs)) == NULL)
goto bail7;
@ -756,6 +758,7 @@ static void __devexit nes_remove(struct pci_dev *pcidev)
struct nes_device *nesdev = pci_get_drvdata(pcidev);
struct net_device *netdev;
int netdev_index = 0;
unsigned long flags;
if (nesdev->netdev_count) {
netdev = nesdev->netdev[netdev_index];
@ -782,6 +785,14 @@ static void __devexit nes_remove(struct pci_dev *pcidev)
free_irq(pcidev->irq, nesdev);
tasklet_kill(&nesdev->dpc_tasklet);
spin_lock_irqsave(&nesdev->nesadapter->phy_lock, flags);
if (nesdev->link_recheck) {
spin_unlock_irqrestore(&nesdev->nesadapter->phy_lock, flags);
cancel_delayed_work_sync(&nesdev->work);
} else {
spin_unlock_irqrestore(&nesdev->nesadapter->phy_lock, flags);
}
/* Deallocate the Adapter Structure */
nes_destroy_adapter(nesdev->nesadapter);

4
drivers/infiniband/hw/nes/nes.h
View file

@ -268,6 +268,9 @@ struct nes_device {
u8 napi_isr_ran;
u8 disable_rx_flow_control;
u8 disable_tx_flow_control;
struct delayed_work work;
u8 link_recheck;
};
@ -507,6 +510,7 @@ void nes_nic_ce_handler(struct nes_device *, struct nes_hw_nic_cq *);
void nes_iwarp_ce_handler(struct nes_device *, struct nes_hw_cq *);
int nes_destroy_cqp(struct nes_device *);
int nes_nic_cm_xmit(struct sk_buff *, struct net_device *);
void nes_recheck_link_status(struct work_struct *work);
/* nes_nic.c */
struct net_device *nes_netdev_init(struct nes_device *, void __iomem *);

81
drivers/infiniband/hw/nes/nes_hw.c
View file

@ -2650,6 +2650,13 @@ static void nes_process_mac_intr(struct nes_device *nesdev, u32 mac_number)
}
}
}
if (nesadapter->phy_type[mac_index] == NES_PHY_TYPE_SFP_D) {
if (nesdev->link_recheck)
cancel_delayed_work(&nesdev->work);
nesdev->link_recheck = 1;
schedule_delayed_work(&nesdev->work,
NES_LINK_RECHECK_DELAY);
}
}
spin_unlock_irqrestore(&nesadapter->phy_lock, flags);
@ -2657,6 +2664,80 @@ static void nes_process_mac_intr(struct nes_device *nesdev, u32 mac_number)
nesadapter->mac_sw_state[mac_number] = NES_MAC_SW_IDLE;
}
void nes_recheck_link_status(struct work_struct *work)
{
unsigned long flags;
struct nes_device *nesdev = container_of(work, struct nes_device, work.work);
struct nes_adapter *nesadapter = nesdev->nesadapter;
struct nes_vnic *nesvnic;
u32 mac_index = nesdev->mac_index;
u16 phy_data;
u16 temp_phy_data;
spin_lock_irqsave(&nesadapter->phy_lock, flags);
/* check link status */
nes_read_10G_phy_reg(nesdev, nesadapter->phy_index[mac_index], 1, 0x9003);
temp_phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
nes_read_10G_phy_reg(nesdev, nesadapter->phy_index[mac_index], 3, 0x0021);
nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
nes_read_10G_phy_reg(nesdev, nesadapter->phy_index[mac_index], 3, 0x0021);
phy_data = (u16)nes_read_indexed(nesdev, NES_IDX_MAC_MDIO_CONTROL);
phy_data = (!temp_phy_data && (phy_data == 0x8000)) ? 0x4 : 0x0;
nes_debug(NES_DBG_PHY, "%s: Phy data = 0x%04X, link was %s.\n",
__func__, phy_data,
nesadapter->mac_link_down[mac_index] ? "DOWN" : "UP");
if (phy_data & 0x0004) {
nesadapter->mac_link_down[mac_index] = 0;
list_for_each_entry(nesvnic, &nesadapter->nesvnic_list[mac_index], list) {
if (nesvnic->linkup == 0) {
printk(PFX "The Link is now up for port %s, netdev %p.\n",
nesvnic->netdev->name, nesvnic->netdev);
if (netif_queue_stopped(nesvnic->netdev))
netif_start_queue(nesvnic->netdev);
nesvnic->linkup = 1;
netif_carrier_on(nesvnic->netdev);
spin_lock(&nesvnic->port_ibevent_lock);
if (nesdev->iw_status == 0) {
nesdev->iw_status = 1;
nes_port_ibevent(nesvnic);
}
spin_unlock(&nesvnic->port_ibevent_lock);
}
}
} else {
nesadapter->mac_link_down[mac_index] = 1;
list_for_each_entry(nesvnic, &nesadapter->nesvnic_list[mac_index], list) {
if (nesvnic->linkup == 1) {
printk(PFX "The Link is now down for port %s, netdev %p.\n",
nesvnic->netdev->name, nesvnic->netdev);
if (!(netif_queue_stopped(nesvnic->netdev)))
netif_stop_queue(nesvnic->netdev);
nesvnic->linkup = 0;
netif_carrier_off(nesvnic->netdev);
spin_lock(&nesvnic->port_ibevent_lock);
if (nesdev->iw_status == 1) {
nesdev->iw_status = 0;
nes_port_ibevent(nesvnic);
}
spin_unlock(&nesvnic->port_ibevent_lock);
}
}
}
if (nesdev->link_recheck++ < NES_LINK_RECHECK_MAX)
schedule_delayed_work(&nesdev->work, NES_LINK_RECHECK_DELAY);
else
nesdev->link_recheck = 0;
spin_unlock_irqrestore(&nesadapter->phy_lock, flags);
}
static void nes_nic_napi_ce_handler(struct nes_device *nesdev, struct nes_hw_nic_cq *cq)

4
drivers/infiniband/hw/nes/nes_hw.h
View file

@ -1354,6 +1354,10 @@ struct nes_terminate_hdr {
#define BAD_FRAME_OFFSET 64
#define CQE_MAJOR_DRV 0x8000
/* Used for link status recheck after interrupt processing */
#define NES_LINK_RECHECK_DELAY msecs_to_jiffies(50)
#define NES_LINK_RECHECK_MAX 60
#define nes_vlan_rx vlan_hwaccel_receive_skb
#define nes_netif_rx netif_receive_skb