Commit 1eaf99fe authored by Alex Maftei (amaftei)'s avatar Alex Maftei (amaftei) Committed by David S. Miller
Browse files

sfc: move some device reset code 



The rest of the reset code will be moved later.
Small code styling fixes included.

Signed-off-by: default avatarAlexandru-Mihai Maftei <amaftei@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7ec3de42

drivers/net/ethernet/sfc/efx.c

+0 −227
Original line number Diff line number Diff line
@@ -2483,184 +2483,6 @@ static void efx_unregister_netdev(struct efx_nic *efx) 
 *

 **************************************************************************/



/* Tears down the entire software state and most of the hardware state

 * before reset.  */

void efx_reset_down(struct efx_nic *efx, enum reset_type method)

{

	EFX_ASSERT_RESET_SERIALISED(efx);



	if (method == RESET_TYPE_MCDI_TIMEOUT)

		efx->type->prepare_flr(efx);



	efx_stop_all(efx);

	efx_disable_interrupts(efx);



	mutex_lock(&efx->mac_lock);

	down_write(&efx->filter_sem);

	mutex_lock(&efx->rss_lock);

	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&

	    method != RESET_TYPE_DATAPATH)

		efx->phy_op->fini(efx);

	efx->type->fini(efx);

}



/* This function will always ensure that the locks acquired in

 * efx_reset_down() are released. A failure return code indicates

 * that we were unable to reinitialise the hardware, and the

 * driver should be disabled. If ok is false, then the rx and tx

 * engines are not restarted, pending a RESET_DISABLE. */

int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)

{

	int rc;



	EFX_ASSERT_RESET_SERIALISED(efx);



	if (method == RESET_TYPE_MCDI_TIMEOUT)

		efx->type->finish_flr(efx);



	/* Ensure that SRAM is initialised even if we're disabling the device */

	rc = efx->type->init(efx);

	if (rc) {

		netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");

		goto fail;

	}



	if (!ok)

		goto fail;



	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&

	    method != RESET_TYPE_DATAPATH) {

		rc = efx->phy_op->init(efx);

		if (rc)

			goto fail;

		rc = efx->phy_op->reconfigure(efx);

		if (rc && rc != -EPERM)

			netif_err(efx, drv, efx->net_dev,

				  "could not restore PHY settings\n");

	}



	rc = efx_enable_interrupts(efx);

	if (rc)

		goto fail;



#ifdef CONFIG_SFC_SRIOV

	rc = efx->type->vswitching_restore(efx);

	if (rc) /* not fatal; the PF will still work fine */

		netif_warn(efx, probe, efx->net_dev,

			   "failed to restore vswitching rc=%d;"

			   " VFs may not function\n", rc);

#endif



	if (efx->type->rx_restore_rss_contexts)

		efx->type->rx_restore_rss_contexts(efx);

	mutex_unlock(&efx->rss_lock);

	efx->type->filter_table_restore(efx);

	up_write(&efx->filter_sem);

	if (efx->type->sriov_reset)

		efx->type->sriov_reset(efx);



	mutex_unlock(&efx->mac_lock);



	efx_start_all(efx);



	if (efx->type->udp_tnl_push_ports)

		efx->type->udp_tnl_push_ports(efx);



	return 0;



fail:

	efx->port_initialized = false;



	mutex_unlock(&efx->rss_lock);

	up_write(&efx->filter_sem);

	mutex_unlock(&efx->mac_lock);



	return rc;

}



/* Reset the NIC using the specified method.  Note that the reset may

 * fail, in which case the card will be left in an unusable state.

 *

 * Caller must hold the rtnl_lock.

 */

int efx_reset(struct efx_nic *efx, enum reset_type method)

{

	int rc, rc2;

	bool disabled;



	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",

		   RESET_TYPE(method));



	efx_device_detach_sync(efx);

	efx_reset_down(efx, method);



	rc = efx->type->reset(efx, method);

	if (rc) {

		netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");

		goto out;

	}



	/* Clear flags for the scopes we covered.  We assume the NIC and

	 * driver are now quiescent so that there is no race here.

	 */

	if (method < RESET_TYPE_MAX_METHOD)

		efx->reset_pending &= -(1 << (method + 1));

	else /* it doesn't fit into the well-ordered scope hierarchy */

		__clear_bit(method, &efx->reset_pending);



	/* Reinitialise bus-mastering, which may have been turned off before

	 * the reset was scheduled. This is still appropriate, even in the

	 * RESET_TYPE_DISABLE since this driver generally assumes the hardware

	 * can respond to requests. */

	pci_set_master(efx->pci_dev);



out:

	/* Leave device stopped if necessary */

	disabled = rc ||

		method == RESET_TYPE_DISABLE ||

		method == RESET_TYPE_RECOVER_OR_DISABLE;

	rc2 = efx_reset_up(efx, method, !disabled);

	if (rc2) {

		disabled = true;

		if (!rc)

			rc = rc2;

	}



	if (disabled) {

		dev_close(efx->net_dev);

		netif_err(efx, drv, efx->net_dev, "has been disabled\n");

		efx->state = STATE_DISABLED;

	} else {

		netif_dbg(efx, drv, efx->net_dev, "reset complete\n");

		efx_device_attach_if_not_resetting(efx);

	}

	return rc;

}



/* Try recovery mechanisms.

 * For now only EEH is supported.

 * Returns 0 if the recovery mechanisms are unsuccessful.

 * Returns a non-zero value otherwise.

 */

int efx_try_recovery(struct efx_nic *efx)

{

#ifdef CONFIG_EEH

	/* A PCI error can occur and not be seen by EEH because nothing

	 * happens on the PCI bus. In this case the driver may fail and

	 * schedule a 'recover or reset', leading to this recovery handler.

	 * Manually call the eeh failure check function.

	 */

	struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);

	if (eeh_dev_check_failure(eehdev)) {

		/* The EEH mechanisms will handle the error and reset the

		 * device if necessary.

		 */

		return 1;

	}

#endif

	return 0;

}



static void efx_wait_for_bist_end(struct efx_nic *efx)

{

	int i;
@@ -2714,55 +2536,6 @@ static void efx_reset_work(struct work_struct *data) 
	rtnl_unlock();

}



void efx_schedule_reset(struct efx_nic *efx, enum reset_type type)

{

	enum reset_type method;



	if (efx->state == STATE_RECOVERY) {

		netif_dbg(efx, drv, efx->net_dev,

			  "recovering: skip scheduling %s reset\n",

			  RESET_TYPE(type));

		return;

	}



	switch (type) {

	case RESET_TYPE_INVISIBLE:

	case RESET_TYPE_ALL:

	case RESET_TYPE_RECOVER_OR_ALL:

	case RESET_TYPE_WORLD:

	case RESET_TYPE_DISABLE:

	case RESET_TYPE_RECOVER_OR_DISABLE:

	case RESET_TYPE_DATAPATH:

	case RESET_TYPE_MC_BIST:

	case RESET_TYPE_MCDI_TIMEOUT:

		method = type;

		netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",

			  RESET_TYPE(method));

		break;

	default:

		method = efx->type->map_reset_reason(type);

		netif_dbg(efx, drv, efx->net_dev,

			  "scheduling %s reset for %s\n",

			  RESET_TYPE(method), RESET_TYPE(type));

		break;

	}



	set_bit(method, &efx->reset_pending);

	smp_mb(); /* ensure we change reset_pending before checking state */



	/* If we're not READY then just leave the flags set as the cue

	 * to abort probing or reschedule the reset later.

	 */

	if (READ_ONCE(efx->state) != STATE_READY)

		return;



	/* efx_process_channel() will no longer read events once a

	 * reset is scheduled. So switch back to poll'd MCDI completions. */

	efx_mcdi_mode_poll(efx);



	efx_queue_reset_work(efx);

}



/**************************************************************************

 *

 * List of NICs we support

drivers/net/ethernet/sfc/efx_common.c

+237 −0
Original line number Diff line number Diff line
@@ -429,3 +429,240 @@ int efx_reconfigure_port(struct efx_nic *efx) 


	return rc;

}



/**************************************************************************

 *

 * Device reset and suspend

 *

 **************************************************************************/



/* Try recovery mechanisms.

 * For now only EEH is supported.

 * Returns 0 if the recovery mechanisms are unsuccessful.

 * Returns a non-zero value otherwise.

 */

int efx_try_recovery(struct efx_nic *efx)

{

#ifdef CONFIG_EEH

	/* A PCI error can occur and not be seen by EEH because nothing

	 * happens on the PCI bus. In this case the driver may fail and

	 * schedule a 'recover or reset', leading to this recovery handler.

	 * Manually call the eeh failure check function.

	 */

	struct eeh_dev *eehdev = pci_dev_to_eeh_dev(efx->pci_dev);

	if (eeh_dev_check_failure(eehdev)) {

		/* The EEH mechanisms will handle the error and reset the

		 * device if necessary.

		 */

		return 1;

	}

#endif

	return 0;

}



/* Tears down the entire software state and most of the hardware state

 * before reset.

 */

void efx_reset_down(struct efx_nic *efx, enum reset_type method)

{

	EFX_ASSERT_RESET_SERIALISED(efx);



	if (method == RESET_TYPE_MCDI_TIMEOUT)

		efx->type->prepare_flr(efx);



	efx_stop_all(efx);

	efx_disable_interrupts(efx);



	mutex_lock(&efx->mac_lock);

	down_write(&efx->filter_sem);

	mutex_lock(&efx->rss_lock);

	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&

	    method != RESET_TYPE_DATAPATH)

		efx->phy_op->fini(efx);

	efx->type->fini(efx);

}



/* This function will always ensure that the locks acquired in

 * efx_reset_down() are released. A failure return code indicates

 * that we were unable to reinitialise the hardware, and the

 * driver should be disabled. If ok is false, then the rx and tx

 * engines are not restarted, pending a RESET_DISABLE.

 */

int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok)

{

	int rc;



	EFX_ASSERT_RESET_SERIALISED(efx);



	if (method == RESET_TYPE_MCDI_TIMEOUT)

		efx->type->finish_flr(efx);



	/* Ensure that SRAM is initialised even if we're disabling the device */

	rc = efx->type->init(efx);

	if (rc) {

		netif_err(efx, drv, efx->net_dev, "failed to initialise NIC\n");

		goto fail;

	}



	if (!ok)

		goto fail;



	if (efx->port_initialized && method != RESET_TYPE_INVISIBLE &&

	    method != RESET_TYPE_DATAPATH) {

		rc = efx->phy_op->init(efx);

		if (rc)

			goto fail;

		rc = efx->phy_op->reconfigure(efx);

		if (rc && rc != -EPERM)

			netif_err(efx, drv, efx->net_dev,

				  "could not restore PHY settings\n");

	}



	rc = efx_enable_interrupts(efx);

	if (rc)

		goto fail;



#ifdef CONFIG_SFC_SRIOV

	rc = efx->type->vswitching_restore(efx);

	if (rc) /* not fatal; the PF will still work fine */

		netif_warn(efx, probe, efx->net_dev,

			   "failed to restore vswitching rc=%d;"

			   " VFs may not function\n", rc);

#endif



	if (efx->type->rx_restore_rss_contexts)

		efx->type->rx_restore_rss_contexts(efx);

	mutex_unlock(&efx->rss_lock);

	efx->type->filter_table_restore(efx);

	up_write(&efx->filter_sem);

	if (efx->type->sriov_reset)

		efx->type->sriov_reset(efx);



	mutex_unlock(&efx->mac_lock);



	efx_start_all(efx);



	if (efx->type->udp_tnl_push_ports)

		efx->type->udp_tnl_push_ports(efx);



	return 0;



fail:

	efx->port_initialized = false;



	mutex_unlock(&efx->rss_lock);

	up_write(&efx->filter_sem);

	mutex_unlock(&efx->mac_lock);



	return rc;

}



/* Reset the NIC using the specified method.  Note that the reset may

 * fail, in which case the card will be left in an unusable state.

 *

 * Caller must hold the rtnl_lock.

 */

int efx_reset(struct efx_nic *efx, enum reset_type method)

{

	bool disabled;

	int rc, rc2;



	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",

		   RESET_TYPE(method));



	efx_device_detach_sync(efx);

	efx_reset_down(efx, method);



	rc = efx->type->reset(efx, method);

	if (rc) {

		netif_err(efx, drv, efx->net_dev, "failed to reset hardware\n");

		goto out;

	}



	/* Clear flags for the scopes we covered.  We assume the NIC and

	 * driver are now quiescent so that there is no race here.

	 */

	if (method < RESET_TYPE_MAX_METHOD)

		efx->reset_pending &= -(1 << (method + 1));

	else /* it doesn't fit into the well-ordered scope hierarchy */

		__clear_bit(method, &efx->reset_pending);



	/* Reinitialise bus-mastering, which may have been turned off before

	 * the reset was scheduled. This is still appropriate, even in the

	 * RESET_TYPE_DISABLE since this driver generally assumes the hardware

	 * can respond to requests.

	 */

	pci_set_master(efx->pci_dev);



out:

	/* Leave device stopped if necessary */

	disabled = rc ||

		method == RESET_TYPE_DISABLE ||

		method == RESET_TYPE_RECOVER_OR_DISABLE;

	rc2 = efx_reset_up(efx, method, !disabled);

	if (rc2) {

		disabled = true;

		if (!rc)

			rc = rc2;

	}



	if (disabled) {

		dev_close(efx->net_dev);

		netif_err(efx, drv, efx->net_dev, "has been disabled\n");

		efx->state = STATE_DISABLED;

	} else {

		netif_dbg(efx, drv, efx->net_dev, "reset complete\n");

		efx_device_attach_if_not_resetting(efx);

	}

	return rc;

}



void efx_schedule_reset(struct efx_nic *efx, enum reset_type type)

{

	enum reset_type method;



	if (efx->state == STATE_RECOVERY) {

		netif_dbg(efx, drv, efx->net_dev,

			  "recovering: skip scheduling %s reset\n",

			  RESET_TYPE(type));

		return;

	}



	switch (type) {

	case RESET_TYPE_INVISIBLE:

	case RESET_TYPE_ALL:

	case RESET_TYPE_RECOVER_OR_ALL:

	case RESET_TYPE_WORLD:

	case RESET_TYPE_DISABLE:

	case RESET_TYPE_RECOVER_OR_DISABLE:

	case RESET_TYPE_DATAPATH:

	case RESET_TYPE_MC_BIST:

	case RESET_TYPE_MCDI_TIMEOUT:

		method = type;

		netif_dbg(efx, drv, efx->net_dev, "scheduling %s reset\n",

			  RESET_TYPE(method));

		break;

	default:

		method = efx->type->map_reset_reason(type);

		netif_dbg(efx, drv, efx->net_dev,

			  "scheduling %s reset for %s\n",

			  RESET_TYPE(method), RESET_TYPE(type));

		break;

	}



	set_bit(method, &efx->reset_pending);

	smp_mb(); /* ensure we change reset_pending before checking state */



	/* If we're not READY then just leave the flags set as the cue

	 * to abort probing or reschedule the reset later.

	 */

	if (READ_ONCE(efx->state) != STATE_READY)

		return;



	/* efx_process_channel() will no longer read events once a

	 * reset is scheduled. So switch back to poll'd MCDI completions.

	 */

	efx_mcdi_mode_poll(efx);



	efx_queue_reset_work(efx);

}

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