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Date: Fri, 16 Feb 2018 11:40:28 -0200
From: Mauro Rodrigues <maurosr@...ux.vnet.ibm.com>
To: Satish Baddipadige <satish.baddipadige@...adcom.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
michael.chan@...adcom.com, prashant@...adcom.com,
siva.kallam@...adcom.com,
Prashant Sreedharan <prashant.sreedharan@...adcom.com>
Subject: Re: [PATCH net] tg3: APE heartbeat changes
On Fri, Feb 16, 2018 at 11:22:43AM +0530, Satish Baddipadige wrote:
> From: Prashant Sreedharan <prashant.sreedharan@...adcom.com>
>
> In ungraceful host shutdown or driver crash case BMC connectivity is
> lost. APE firmware is missing the driver state in this
> case to keep the BMC connectivity alive.
> This patch has below change to address this issue.
>
> Heartbeat mechanism with APE firmware. This heartbeat mechanism
> is needed to notify the APE firmware about driver state.
>
> This patch also has the change in wait time for APE event from
> 1ms to 20ms as there can be some delay in getting response.
>
> Signed-off-by: Prashant Sreedharan <prashant.sreedharan@...adcom.com>
> Signed-off-by: Satish Baddipadige <satish.baddipadige@...adcom.com>
> Signed-off-by: Siva Reddy Kallam <siva.kallam@...adcom.com>
> Acked-by: Michael Chan <michael.chan@...adcom.com>
Tested-by: Mauro S. M. Rodrigues <maurosr@...ux.vnet.ibm.com>
Thank you very much for the patch Satish.
> ---
> drivers/net/ethernet/broadcom/tg3.c | 35 ++++++++++++++++++++++++-----------
> drivers/net/ethernet/broadcom/tg3.h | 5 +++++
> 2 files changed, 29 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> index a77ee2f..36d8d1e 100644
> --- a/drivers/net/ethernet/broadcom/tg3.c
> +++ b/drivers/net/ethernet/broadcom/tg3.c
> @@ -820,7 +820,7 @@ static int tg3_ape_event_lock(struct tg3 *tp, u32 timeout_us)
>
> tg3_ape_unlock(tp, TG3_APE_LOCK_MEM);
>
> - udelay(10);
> + usleep_range(10, 20);
> timeout_us -= (timeout_us > 10) ? 10 : timeout_us;
> }
>
> @@ -922,8 +922,8 @@ static int tg3_ape_send_event(struct tg3 *tp, u32 event)
> if (!(apedata & APE_FW_STATUS_READY))
> return -EAGAIN;
>
> - /* Wait for up to 1 millisecond for APE to service previous event. */
> - err = tg3_ape_event_lock(tp, 1000);
> + /* Wait for up to 20 millisecond for APE to service previous event. */
> + err = tg3_ape_event_lock(tp, 20000);
> if (err)
> return err;
>
> @@ -946,6 +946,7 @@ static void tg3_ape_driver_state_change(struct tg3 *tp, int kind)
>
> switch (kind) {
> case RESET_KIND_INIT:
> + tg3_ape_write32(tp, TG3_APE_HOST_HEARTBEAT_COUNT, tp->ape_hb++);
> tg3_ape_write32(tp, TG3_APE_HOST_SEG_SIG,
> APE_HOST_SEG_SIG_MAGIC);
> tg3_ape_write32(tp, TG3_APE_HOST_SEG_LEN,
> @@ -962,13 +963,6 @@ static void tg3_ape_driver_state_change(struct tg3 *tp, int kind)
> event = APE_EVENT_STATUS_STATE_START;
> break;
> case RESET_KIND_SHUTDOWN:
> - /* With the interface we are currently using,
> - * APE does not track driver state. Wiping
> - * out the HOST SEGMENT SIGNATURE forces
> - * the APE to assume OS absent status.
> - */
> - tg3_ape_write32(tp, TG3_APE_HOST_SEG_SIG, 0x0);
> -
> if (device_may_wakeup(&tp->pdev->dev) &&
> tg3_flag(tp, WOL_ENABLE)) {
> tg3_ape_write32(tp, TG3_APE_HOST_WOL_SPEED,
> @@ -990,6 +984,18 @@ static void tg3_ape_driver_state_change(struct tg3 *tp, int kind)
> tg3_ape_send_event(tp, event);
> }
>
> +static inline void tg3_send_ape_heartbeat(struct tg3 *tp,
> + unsigned long interval)
> +{
> + /* Check if hb interval has exceeded */
> + if (!tg3_flag(tp, ENABLE_APE) ||
> + time_before(jiffies, tp->ape_hb_jiffies + interval))
> + return;
> +
> + tg3_ape_write32(tp, TG3_APE_HOST_HEARTBEAT_COUNT, tp->ape_hb++);
> + tp->ape_hb_jiffies = jiffies;
> +}
> +
> static void tg3_disable_ints(struct tg3 *tp)
> {
> int i;
> @@ -7262,6 +7268,7 @@ static int tg3_poll_msix(struct napi_struct *napi, int budget)
> }
> }
>
> + tg3_send_ape_heartbeat(tp, TG3_APE_HB_INTERVAL << 1);
> return work_done;
>
> tx_recovery:
> @@ -7344,6 +7351,7 @@ static int tg3_poll(struct napi_struct *napi, int budget)
> }
> }
>
> + tg3_send_ape_heartbeat(tp, TG3_APE_HB_INTERVAL << 1);
> return work_done;
>
> tx_recovery:
> @@ -10732,7 +10740,7 @@ static int tg3_reset_hw(struct tg3 *tp, bool reset_phy)
> if (tg3_flag(tp, ENABLE_APE))
> /* Write our heartbeat update interval to APE. */
> tg3_ape_write32(tp, TG3_APE_HOST_HEARTBEAT_INT_MS,
> - APE_HOST_HEARTBEAT_INT_DISABLE);
> + APE_HOST_HEARTBEAT_INT_5SEC);
>
> tg3_write_sig_post_reset(tp, RESET_KIND_INIT);
>
> @@ -11077,6 +11085,9 @@ static void tg3_timer(struct timer_list *t)
> tp->asf_counter = tp->asf_multiplier;
> }
>
> + /* Update the APE heartbeat every 5 seconds.*/
> + tg3_send_ape_heartbeat(tp, TG3_APE_HB_INTERVAL);
> +
> spin_unlock(&tp->lock);
>
> restart_timer:
> @@ -16653,6 +16664,8 @@ static int tg3_get_invariants(struct tg3 *tp, const struct pci_device_id *ent)
> pci_state_reg);
>
> tg3_ape_lock_init(tp);
> + tp->ape_hb_interval =
> + msecs_to_jiffies(APE_HOST_HEARTBEAT_INT_5SEC);
> }
>
> /* Set up tp->grc_local_ctrl before calling
> diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
> index 47f51cc..1d61aa3 100644
> --- a/drivers/net/ethernet/broadcom/tg3.h
> +++ b/drivers/net/ethernet/broadcom/tg3.h
> @@ -2508,6 +2508,7 @@
> #define TG3_APE_LOCK_PHY3 5
> #define TG3_APE_LOCK_GPIO 7
>
> +#define TG3_APE_HB_INTERVAL (tp->ape_hb_interval)
> #define TG3_EEPROM_SB_F1R2_MBA_OFF 0x10
>
>
> @@ -3423,6 +3424,10 @@ struct tg3 {
> struct device *hwmon_dev;
> bool link_up;
> bool pcierr_recovery;
> +
> + u32 ape_hb;
> + unsigned long ape_hb_interval;
> + unsigned long ape_hb_jiffies;
> };
>
> /* Accessor macros for chip and asic attributes
> --
> 2.1.0
>
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