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Commit e4abce85 authored by Ben Hutchings's avatar Ben Hutchings
Browse files

sfc: Use netif_device_{detach,attach}() around reset and self-test 



We need to keep the TX queues stopped throughout a reset, without
triggering the TX watchdog and regardless of the link state.  The
proper way to do this is to use netif_device_{detach,attach}() just as
we do around suspend/resume, rather than the current bodge of faking
link-down.

Since we also need to do this during an offline self-test and we
perform a reset during that, add these function calls outside of
efx_reset_down() and efx_reset_up().

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
parent 602a5322

drivers/net/sfc/efx.c

+3 −6
Original line number Diff line number Diff line
@@ -798,11 +798,6 @@ void efx_link_status_changed(struct efx_nic *efx) 
	if (!netif_running(efx->net_dev))

		return;



	if (efx->port_inhibited) {

		netif_carrier_off(efx->net_dev);

		return;

	}



	if (link_state->up != netif_carrier_ok(efx->net_dev)) {

		efx->n_link_state_changes++;
@@ -1450,7 +1445,7 @@ static void efx_start_all(struct efx_nic *efx) 
	 * restart the transmit interface early so the watchdog timer stops */

	efx_start_port(efx);



	if (efx_dev_registered(efx) && !efx->port_inhibited)

	if (efx_dev_registered(efx) && netif_device_present(efx->net_dev))

		netif_tx_wake_all_queues(efx->net_dev);



	efx_for_each_channel(channel, efx)
@@ -2114,6 +2109,7 @@ int efx_reset(struct efx_nic *efx, enum reset_type method) 
	netif_info(efx, drv, efx->net_dev, "resetting (%s)\n",

		   RESET_TYPE(method));



	netif_device_detach(efx->net_dev);

	efx_reset_down(efx, method);



	rc = efx->type->reset(efx, method);
@@ -2147,6 +2143,7 @@ int efx_reset(struct efx_nic *efx, enum reset_type method) 
		efx->state = STATE_DISABLED;

	} else {

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

		netif_device_attach(efx->net_dev);

	}

	return rc;

}

drivers/net/sfc/net_driver.h

+1 −3
Original line number Diff line number Diff line
@@ -670,13 +670,12 @@ struct efx_filter_state; 
 * @mtd_list: List of MTDs attached to the NIC

 * @nic_data: Hardware dependent state

 * @mac_lock: MAC access lock. Protects @port_enabled, @phy_mode,

 *	@port_inhibited, efx_monitor() and efx_reconfigure_port()

 *	efx_monitor() and efx_reconfigure_port()

 * @port_enabled: Port enabled indicator.

 *	Serialises efx_stop_all(), efx_start_all(), efx_monitor() and

 *	efx_mac_work() with kernel interfaces. Safe to read under any

 *	one of the rtnl_lock, mac_lock, or netif_tx_lock, but all three must

 *	be held to modify it.

 * @port_inhibited: If set, the netif_carrier is always off. Hold the mac_lock

 * @port_initialized: Port initialized?

 * @net_dev: Operating system network device. Consider holding the rtnl lock

 * @stats_buffer: DMA buffer for statistics
@@ -764,7 +763,6 @@ struct efx_nic { 
	struct mutex mac_lock;

	struct work_struct mac_work;

	bool port_enabled;

	bool port_inhibited;



	bool port_initialized;

	struct net_device *net_dev;

drivers/net/sfc/selftest.c

+5 −6
Original line number Diff line number Diff line
@@ -695,12 +695,12 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests, 
	/* Offline (i.e. disruptive) testing

	 * This checks MAC and PHY loopback on the specified port. */



	/* force the carrier state off so the kernel doesn't transmit during

	 * the loopback test, and the watchdog timeout doesn't fire. Also put

	 * falcon into loopback for the register test.

	/* Detach the device so the kernel doesn't transmit during the

	 * loopback test and the watchdog timeout doesn't fire.

	 */

	netif_device_detach(efx->net_dev);



	mutex_lock(&efx->mac_lock);

	efx->port_inhibited = true;

	if (efx->loopback_modes) {

		/* We need the 312 clock from the PHY to test the XMAC

		 * registers, so move into XGMII loopback if available */
@@ -750,12 +750,11 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests, 
	/* restore the PHY to the previous state */

	mutex_lock(&efx->mac_lock);

	efx->phy_mode = phy_mode;

	efx->port_inhibited = false;

	efx->loopback_mode = loopback_mode;

	__efx_reconfigure_port(efx);

	mutex_unlock(&efx->mac_lock);



	netif_tx_wake_all_queues(efx->net_dev);

	netif_device_attach(efx->net_dev);



	return rc_test;

}

drivers/net/sfc/tx.c

+5 −4
Original line number Diff line number Diff line
@@ -205,7 +205,9 @@ netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb) 
					goto unwind;

				}

				smp_mb();

				netif_tx_start_queue(tx_queue->core_txq);

				if (likely(!efx->loopback_selftest))

					netif_tx_start_queue(

						tx_queue->core_txq);

			}



			insert_ptr = tx_queue->insert_count & tx_queue->ptr_mask;
@@ -338,8 +340,7 @@ netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb, 
	struct efx_tx_queue *tx_queue;

	unsigned index, type;



	if (unlikely(efx->port_inhibited))

		return NETDEV_TX_BUSY;

	EFX_WARN_ON_PARANOID(!netif_device_present(net_dev));



	index = skb_get_queue_mapping(skb);

	type = skb->ip_summed == CHECKSUM_PARTIAL ? EFX_TXQ_TYPE_OFFLOAD : 0;
@@ -436,7 +437,7 @@ void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index) 
	smp_mb();

	if (unlikely(netif_tx_queue_stopped(tx_queue->core_txq)) &&

	    likely(efx->port_enabled) &&

	    likely(!efx->port_inhibited)) {

	    likely(netif_device_present(efx->net_dev))) {

		fill_level = tx_queue->insert_count - tx_queue->read_count;

		if (fill_level < EFX_TXQ_THRESHOLD(efx)) {

			EFX_BUG_ON_PARANOID(!efx_dev_registered(efx));