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ionic: monitor fw status generation

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The top 4 bits of the fw_status in dev_info_regs is reserved
for the status generation.  This generation number is an
arbitrary value defined when firmware starts up.  If the FW
is killed/crashed/stopped and then restarted, it will create
a different generation number.  With this mechanism, the host
driver can detect that the FW has crashed and restarted, and
the driver can then take steps to re-initialize its connection.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson 2021-07-27 10:43:26 -07:00 committed by David S. Miller
parent c0b03e8399
commit d2662072c0
3 changed files with 31 additions and 3 deletions
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28
drivers/net/ethernet/pensando/ionic/ionic_dev.c
View file

@ -106,6 +106,8 @@ int ionic_dev_setup(struct ionic *ionic)
idev->last_fw_hb = 0;
idev->fw_hb_ready = true;
idev->fw_status_ready = true;
idev->fw_generation = IONIC_FW_STS_F_GENERATION &
ioread8(&idev->dev_info_regs->fw_status);
mod_timer(&ionic->watchdog_timer,
round_jiffies(jiffies + ionic->watchdog_period));
@ -121,7 +123,9 @@ int ionic_heartbeat_check(struct ionic *ionic)
{
struct ionic_dev *idev = &ionic->idev;
unsigned long check_time, last_check_time;
bool fw_status_ready, fw_hb_ready;
bool fw_status_ready = true;
bool fw_hb_ready;
u8 fw_generation;
u8 fw_status;
u32 fw_hb;
@ -140,9 +144,29 @@ int ionic_heartbeat_check(struct ionic *ionic)
/* firmware is useful only if the running bit is set and
* fw_status != 0xff (bad PCI read)
* If fw_status is not ready don't bother with the generation.
*/
fw_status = ioread8(&idev->dev_info_regs->fw_status);
fw_status_ready = (fw_status != 0xff) && (fw_status & IONIC_FW_STS_F_RUNNING);
if (fw_status == 0xff || !(fw_status & IONIC_FW_STS_F_RUNNING)) {
fw_status_ready = false;
} else {
fw_generation = fw_status & IONIC_FW_STS_F_GENERATION;
if (idev->fw_generation != fw_generation) {
dev_info(ionic->dev, "FW generation 0x%02x -> 0x%02x\n",
idev->fw_generation, fw_generation);
idev->fw_generation = fw_generation;
/* If the generation changed, the fw status is not
* ready so we need to trigger a fw-down cycle. After
* the down, the next watchdog will see the fw is up
* and the generation value stable, so will trigger
* the fw-up activity.
*/
fw_status_ready = false;
}
}
/* is this a transition? */
if (fw_status_ready != idev->fw_status_ready) {

1
drivers/net/ethernet/pensando/ionic/ionic_dev.h
View file

@ -143,6 +143,7 @@ struct ionic_dev {
u32 last_fw_hb;
bool fw_hb_ready;
bool fw_status_ready;
u8 fw_generation;
u64 __iomem *db_pages;
dma_addr_t phy_db_pages;

5
drivers/net/ethernet/pensando/ionic/ionic_if.h
View file

@ -2936,6 +2936,8 @@ struct ionic_hwstamp_regs {
* @asic_type: Asic type
* @asic_rev: Asic revision
* @fw_status: Firmware status
* bit 0 - 1 = fw running
* bit 4-7 - 4 bit generation number, changes on fw restart
* @fw_heartbeat: Firmware heartbeat counter
* @serial_num: Serial number
* @fw_version: Firmware version
@ -2949,7 +2951,8 @@ union ionic_dev_info_regs {
u8 version;
u8 asic_type;
u8 asic_rev;
#define IONIC_FW_STS_F_RUNNING 0x1
#define IONIC_FW_STS_F_RUNNING 0x01
#define IONIC_FW_STS_F_GENERATION 0xF0
u8 fw_status;
u32 fw_heartbeat;
char fw_version[IONIC_DEVINFO_FWVERS_BUFLEN];