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bnx2x: AER revised
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Revised bnx2x implementation of PCI Express Advanced Error Recovery -
stop and free driver resources according to the AER flow (instead of the
currently implemented `hope-for-the-best' release approach), and do not make
any assumptions on the HW state after slot reset.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@davem330
Yuval Mintz authored and davem330 committed Mar 20, 2013
1 parent 47a5247 commit 7fa6f34
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Showing 4 changed files with 130 additions and 30 deletions.
3 changes: 2 additions & 1 deletion drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1226,10 +1226,11 @@ enum {


struct bnx2x_prev_path_list {
struct list_head list;
u8 bus;
u8 slot;
u8 path;
struct list_head list;
u8 aer;
u8 undi;
};

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4 changes: 2 additions & 2 deletions drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2010,7 +2010,7 @@ static int bnx2x_init_hw(struct bnx2x *bp, u32 load_code)
* Cleans the object that have internal lists without sending
* ramrods. Should be run when interrutps are disabled.
*/
static void bnx2x_squeeze_objects(struct bnx2x *bp)
void bnx2x_squeeze_objects(struct bnx2x *bp)
{
int rc;
unsigned long ramrod_flags = 0, vlan_mac_flags = 0;
Expand Down Expand Up @@ -2775,7 +2775,7 @@ int bnx2x_nic_load(struct bnx2x *bp, int load_mode)
#endif /* ! BNX2X_STOP_ON_ERROR */
}

static int bnx2x_drain_tx_queues(struct bnx2x *bp)
int bnx2x_drain_tx_queues(struct bnx2x *bp)
{
u8 rc = 0, cos, i;

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4 changes: 4 additions & 0 deletions drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1402,4 +1402,8 @@ static inline bool bnx2x_is_valid_ether_addr(struct bnx2x *bp, u8 *addr)
*
*/
void bnx2x_fill_fw_str(struct bnx2x *bp, char *buf, size_t buf_len);

int bnx2x_drain_tx_queues(struct bnx2x *bp);
void bnx2x_squeeze_objects(struct bnx2x *bp);

#endif /* BNX2X_CMN_H */
149 changes: 122 additions & 27 deletions drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9718,6 +9718,31 @@ static struct bnx2x_prev_path_list *
return NULL;
}

static int bnx2x_prev_path_mark_eeh(struct bnx2x *bp)
{
struct bnx2x_prev_path_list *tmp_list;
int rc;

rc = down_interruptible(&bnx2x_prev_sem);
if (rc) {
BNX2X_ERR("Received %d when tried to take lock\n", rc);
return rc;
}

tmp_list = bnx2x_prev_path_get_entry(bp);
if (tmp_list) {
tmp_list->aer = 1;
rc = 0;
} else {
BNX2X_ERR("path %d: Entry does not exist for eeh; Flow occurs before initial insmod is over ?\n",
BP_PATH(bp));
}

up(&bnx2x_prev_sem);

return rc;
}

static bool bnx2x_prev_is_path_marked(struct bnx2x *bp)
{
struct bnx2x_prev_path_list *tmp_list;
Expand All @@ -9726,14 +9751,15 @@ static bool bnx2x_prev_is_path_marked(struct bnx2x *bp)
if (down_trylock(&bnx2x_prev_sem))
return false;

list_for_each_entry(tmp_list, &bnx2x_prev_list, list) {
if (PCI_SLOT(bp->pdev->devfn) == tmp_list->slot &&
bp->pdev->bus->number == tmp_list->bus &&
BP_PATH(bp) == tmp_list->path) {
tmp_list = bnx2x_prev_path_get_entry(bp);
if (tmp_list) {
if (tmp_list->aer) {
DP(NETIF_MSG_HW, "Path %d was marked by AER\n",
BP_PATH(bp));
} else {
rc = true;
BNX2X_DEV_INFO("Path %d was already cleaned from previous drivers\n",
BP_PATH(bp));
break;
}
}

Expand All @@ -9747,6 +9773,28 @@ static int bnx2x_prev_mark_path(struct bnx2x *bp, bool after_undi)
struct bnx2x_prev_path_list *tmp_list;
int rc;

rc = down_interruptible(&bnx2x_prev_sem);
if (rc) {
BNX2X_ERR("Received %d when tried to take lock\n", rc);
return rc;
}

/* Check whether the entry for this path already exists */
tmp_list = bnx2x_prev_path_get_entry(bp);
if (tmp_list) {
if (!tmp_list->aer) {
BNX2X_ERR("Re-Marking the path.\n");
} else {
DP(NETIF_MSG_HW, "Removing AER indication from path %d\n",
BP_PATH(bp));
tmp_list->aer = 0;
}
up(&bnx2x_prev_sem);
return 0;
}
up(&bnx2x_prev_sem);

/* Create an entry for this path and add it */
tmp_list = kmalloc(sizeof(struct bnx2x_prev_path_list), GFP_KERNEL);
if (!tmp_list) {
BNX2X_ERR("Failed to allocate 'bnx2x_prev_path_list'\n");
Expand All @@ -9756,15 +9804,16 @@ static int bnx2x_prev_mark_path(struct bnx2x *bp, bool after_undi)
tmp_list->bus = bp->pdev->bus->number;
tmp_list->slot = PCI_SLOT(bp->pdev->devfn);
tmp_list->path = BP_PATH(bp);
tmp_list->aer = 0;
tmp_list->undi = after_undi ? (1 << BP_PORT(bp)) : 0;

rc = down_interruptible(&bnx2x_prev_sem);
if (rc) {
BNX2X_ERR("Received %d when tried to take lock\n", rc);
kfree(tmp_list);
} else {
BNX2X_DEV_INFO("Marked path [%d] - finished previous unload\n",
BP_PATH(bp));
DP(NETIF_MSG_HW, "Marked path [%d] - finished previous unload\n",
BP_PATH(bp));
list_add(&tmp_list->list, &bnx2x_prev_list);
up(&bnx2x_prev_sem);
}
Expand Down Expand Up @@ -10003,6 +10052,7 @@ static int bnx2x_prev_unload(struct bnx2x *bp)
}

do {
int aer = 0;
/* Lock MCP using an unload request */
fw = bnx2x_fw_command(bp, DRV_MSG_CODE_UNLOAD_REQ_WOL_DIS, 0);
if (!fw) {
Expand All @@ -10011,7 +10061,18 @@ static int bnx2x_prev_unload(struct bnx2x *bp)
break;
}

if (fw == FW_MSG_CODE_DRV_UNLOAD_COMMON) {
rc = down_interruptible(&bnx2x_prev_sem);
if (rc) {
BNX2X_ERR("Cannot check for AER; Received %d when tried to take lock\n",
rc);
} else {
/* If Path is marked by EEH, ignore unload status */
aer = !!(bnx2x_prev_path_get_entry(bp) &&
bnx2x_prev_path_get_entry(bp)->aer);
}
up(&bnx2x_prev_sem);

if (fw == FW_MSG_CODE_DRV_UNLOAD_COMMON || aer) {
rc = bnx2x_prev_unload_common(bp);
break;
}
Expand Down Expand Up @@ -12632,9 +12693,7 @@ static void bnx2x_remove_one(struct pci_dev *pdev)

static int bnx2x_eeh_nic_unload(struct bnx2x *bp)
{
int i;

bp->state = BNX2X_STATE_ERROR;
bp->state = BNX2X_STATE_CLOSING_WAIT4_HALT;

bp->rx_mode = BNX2X_RX_MODE_NONE;

Expand All @@ -12643,29 +12702,21 @@ static int bnx2x_eeh_nic_unload(struct bnx2x *bp)

/* Stop Tx */
bnx2x_tx_disable(bp);

bnx2x_netif_stop(bp, 0);
/* Delete all NAPI objects */
bnx2x_del_all_napi(bp);
if (CNIC_LOADED(bp))
bnx2x_del_all_napi_cnic(bp);
netdev_reset_tc(bp->dev);

del_timer_sync(&bp->timer);
cancel_delayed_work(&bp->sp_task);
cancel_delayed_work(&bp->period_task);

bnx2x_stats_handle(bp, STATS_EVENT_STOP);

/* Release IRQs */
bnx2x_free_irq(bp);

/* Free SKBs, SGEs, TPA pool and driver internals */
bnx2x_free_skbs(bp);

for_each_rx_queue(bp, i)
bnx2x_free_rx_sge_range(bp, bp->fp + i, NUM_RX_SGE);

bnx2x_free_mem(bp);
spin_lock_bh(&bp->stats_lock);
bp->stats_state = STATS_STATE_DISABLED;
spin_unlock_bh(&bp->stats_lock);

bp->state = BNX2X_STATE_CLOSED;
bnx2x_save_statistics(bp);

netif_carrier_off(bp->dev);

Expand Down Expand Up @@ -12701,6 +12752,8 @@ static pci_ers_result_t bnx2x_io_error_detected(struct pci_dev *pdev,

rtnl_lock();

BNX2X_ERR("IO error detected\n");

netif_device_detach(dev);

if (state == pci_channel_io_perm_failure) {
Expand All @@ -12711,6 +12764,8 @@ static pci_ers_result_t bnx2x_io_error_detected(struct pci_dev *pdev,
if (netif_running(dev))
bnx2x_eeh_nic_unload(bp);

bnx2x_prev_path_mark_eeh(bp);

pci_disable_device(pdev);

rtnl_unlock();
Expand All @@ -12729,9 +12784,10 @@ static pci_ers_result_t bnx2x_io_slot_reset(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev);
struct bnx2x *bp = netdev_priv(dev);
int i;

rtnl_lock();

BNX2X_ERR("IO slot reset initializing...\n");
if (pci_enable_device(pdev)) {
dev_err(&pdev->dev,
"Cannot re-enable PCI device after reset\n");
Expand All @@ -12745,6 +12801,42 @@ static pci_ers_result_t bnx2x_io_slot_reset(struct pci_dev *pdev)
if (netif_running(dev))
bnx2x_set_power_state(bp, PCI_D0);

if (netif_running(dev)) {
BNX2X_ERR("IO slot reset --> driver unload\n");
if (IS_PF(bp) && SHMEM2_HAS(bp, drv_capabilities_flag)) {
u32 v;

v = SHMEM2_RD(bp,
drv_capabilities_flag[BP_FW_MB_IDX(bp)]);
SHMEM2_WR(bp, drv_capabilities_flag[BP_FW_MB_IDX(bp)],
v & ~DRV_FLAGS_CAPABILITIES_LOADED_L2);
}
bnx2x_drain_tx_queues(bp);
bnx2x_send_unload_req(bp, UNLOAD_RECOVERY);
bnx2x_netif_stop(bp, 1);
bnx2x_free_irq(bp);

/* Report UNLOAD_DONE to MCP */
bnx2x_send_unload_done(bp, true);

bp->sp_state = 0;
bp->port.pmf = 0;

bnx2x_prev_unload(bp);

/* We should have resetted the engine, so It's fair to
* assume the FW will no longer write to the bnx2x driver.
*/
bnx2x_squeeze_objects(bp);
bnx2x_free_skbs(bp);
for_each_rx_queue(bp, i)
bnx2x_free_rx_sge_range(bp, bp->fp + i, NUM_RX_SGE);
bnx2x_free_fp_mem(bp);
bnx2x_free_mem(bp);

bp->state = BNX2X_STATE_CLOSED;
}

rtnl_unlock();

return PCI_ERS_RESULT_RECOVERED;
Expand All @@ -12771,6 +12863,9 @@ static void bnx2x_io_resume(struct pci_dev *pdev)

bnx2x_eeh_recover(bp);

bp->fw_seq = SHMEM_RD(bp, func_mb[BP_FW_MB_IDX(bp)].drv_mb_header) &
DRV_MSG_SEQ_NUMBER_MASK;

if (netif_running(dev))
bnx2x_nic_load(bp, LOAD_NORMAL);

Expand Down

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