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: Ben Hutchings <bhutchings@solarflare.com>
diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c
index 796c47e..05502b3 100644
--- a/drivers/net/sfc/efx.c
+++ b/drivers/net/sfc/efx.c
@@ -798,11 +798,6 @@
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 @@
* 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 @@
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 @@
efx->state = STATE_DISABLED;
} else {
netif_dbg(efx, drv, efx->net_dev, "reset complete\n");
+ netif_device_attach(efx->net_dev);
}
return rc;
}
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h
index 5718260..ce9697b 100644
--- a/drivers/net/sfc/net_driver.h
+++ b/drivers/net/sfc/net_driver.h
@@ -670,13 +670,12 @@
* @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 mutex mac_lock;
struct work_struct mac_work;
bool port_enabled;
- bool port_inhibited;
bool port_initialized;
struct net_device *net_dev;
diff --git a/drivers/net/sfc/selftest.c b/drivers/net/sfc/selftest.c
index 50ad3bc..822f6c2 100644
--- a/drivers/net/sfc/selftest.c
+++ b/drivers/net/sfc/selftest.c
@@ -695,12 +695,12 @@
/* 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 @@
/* 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;
}
diff --git a/drivers/net/sfc/tx.c b/drivers/net/sfc/tx.c
index d2c85df..84eb99e 100644
--- a/drivers/net/sfc/tx.c
+++ b/drivers/net/sfc/tx.c
@@ -205,7 +205,9 @@
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 @@
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 @@
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));