sfc: Move details of a Falcon bug workaround out of ethtool.c

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

drivers/net/ethernet/sfc/ethtool.c

@@ -709,7 +709,6 @@ static int efx_ethtool_set_pauseparam(struct net_device *net_dev,
 	struct efx_nic *efx = netdev_priv(net_dev);
 	u8 wanted_fc, old_fc;
 	u32 old_adv;
-	bool reset;
 	int rc = 0;
 
 	mutex_lock(&efx->mac_lock);
@@ -732,24 +731,10 @@ static int efx_ethtool_set_pauseparam(struct net_device *net_dev,
 		goto out;
 	}
 
-	/* TX flow control may automatically turn itself off if the
+	/* Hook for Falcon bug 11482 workaround */
-	 * link partner (intermittently) stops responding to pause
+	if (efx->type->prepare_enable_fc_tx &&
-	 * frames. There isn't any indication that this has happened,
+	    (wanted_fc & EFX_FC_TX) && !(efx->wanted_fc & EFX_FC_TX))
-	 * so the best we do is leave it up to the user to spot this
+		efx->type->prepare_enable_fc_tx(efx);
-	 * and fix it be cycling transmit flow control on this end. */
-	reset = (wanted_fc & EFX_FC_TX) && !(efx->wanted_fc & EFX_FC_TX);
-	if (EFX_WORKAROUND_11482(efx) && reset) {
-		if (efx_nic_rev(efx) == EFX_REV_FALCON_B0) {
-			/* Recover by resetting the EM block */
-			falcon_stop_nic_stats(efx);
-			falcon_drain_tx_fifo(efx);
-			falcon_reconfigure_xmac(efx);
-			falcon_start_nic_stats(efx);
-		} else {
-			/* Schedule a reset to recover */
-			efx_schedule_reset(efx, RESET_TYPE_INVISIBLE);
-		}
-	}
 
 	old_adv = efx->link_advertising;
 	old_fc = efx->wanted_fc;

drivers/net/ethernet/sfc/falcon.c

@@ -497,7 +497,7 @@ static void falcon_reset_macs(struct efx_nic *efx)
 	falcon_setup_xaui(efx);
 }
 
-void falcon_drain_tx_fifo(struct efx_nic *efx)
+static void falcon_drain_tx_fifo(struct efx_nic *efx)
 {
 	efx_oword_t reg;
 
@@ -678,6 +678,28 @@ static int falcon_reconfigure_port(struct efx_nic *efx)
 	return 0;
 }
 
+/* TX flow control may automatically turn itself off if the link
+ * partner (intermittently) stops responding to pause frames. There
+ * isn't any indication that this has happened, so the best we do is
+ * leave it up to the user to spot this and fix it by cycling transmit
+ * flow control on this end.
+ */
+
+static void falcon_a1_prepare_enable_fc_tx(struct efx_nic *efx)
+{
+	/* Schedule a reset to recover */
+	efx_schedule_reset(efx, RESET_TYPE_INVISIBLE);
+}
+
+static void falcon_b0_prepare_enable_fc_tx(struct efx_nic *efx)
+{
+	/* Recover by resetting the EM block */
+	falcon_stop_nic_stats(efx);
+	falcon_drain_tx_fifo(efx);
+	falcon_reconfigure_xmac(efx);
+	falcon_start_nic_stats(efx);
+}
+
 /**************************************************************************
  *
  * PHY access via GMII
@@ -1798,6 +1820,7 @@ const struct efx_nic_type falcon_a1_nic_type = {
 	.set_id_led = falcon_set_id_led,
 	.push_irq_moderation = falcon_push_irq_moderation,
 	.reconfigure_port = falcon_reconfigure_port,
+	.prepare_enable_fc_tx = falcon_a1_prepare_enable_fc_tx,
 	.reconfigure_mac = falcon_reconfigure_xmac,
 	.check_mac_fault = falcon_xmac_check_fault,
 	.get_wol = falcon_get_wol,
@@ -1842,6 +1865,7 @@ const struct efx_nic_type falcon_b0_nic_type = {
 	.set_id_led = falcon_set_id_led,
 	.push_irq_moderation = falcon_push_irq_moderation,
 	.reconfigure_port = falcon_reconfigure_port,
+	.prepare_enable_fc_tx = falcon_b0_prepare_enable_fc_tx,
 	.reconfigure_mac = falcon_reconfigure_xmac,
 	.check_mac_fault = falcon_xmac_check_fault,
 	.get_wol = falcon_get_wol,

drivers/net/ethernet/sfc/net_driver.h

@@ -946,6 +946,7 @@ static inline unsigned int efx_port_num(struct efx_nic *efx)
  * @set_id_led: Set state of identifying LED or revert to automatic function
  * @push_irq_moderation: Apply interrupt moderation value
  * @reconfigure_port: Push loopback/power/txdis changes to the MAC and PHY
+ * @prepare_enable_fc_tx: Prepare MAC to enable pause frame TX (may be %NULL)
  * @reconfigure_mac: Push MAC address, MTU, flow control and filter settings
  *	to the hardware.  Serialised by the mac_lock.
  * @check_mac_fault: Check MAC fault state. True if fault present.
@@ -995,6 +996,7 @@ struct efx_nic_type {
 	void (*set_id_led)(struct efx_nic *efx, enum efx_led_mode mode);
 	void (*push_irq_moderation)(struct efx_channel *channel);
 	int (*reconfigure_port)(struct efx_nic *efx);
+	void (*prepare_enable_fc_tx)(struct efx_nic *efx);
 	int (*reconfigure_mac)(struct efx_nic *efx);
 	bool (*check_mac_fault)(struct efx_nic *efx);
 	void (*get_wol)(struct efx_nic *efx, struct ethtool_wolinfo *wol);

drivers/net/ethernet/sfc/nic.h

@@ -298,7 +298,6 @@ extern void efx_nic_eventq_read_ack(struct efx_channel *channel);
 extern bool efx_nic_event_present(struct efx_channel *channel);
 
 /* MAC/PHY */
-extern void falcon_drain_tx_fifo(struct efx_nic *efx);
 extern void falcon_reconfigure_mac_wrapper(struct efx_nic *efx);
 extern bool falcon_xmac_check_fault(struct efx_nic *efx);
 extern int falcon_reconfigure_xmac(struct efx_nic *efx);

drivers/net/ethernet/sfc/workarounds.h

@@ -30,8 +30,6 @@
 /* TX_EV_PKT_ERR can be caused by a dangling TX descriptor
  * or a PCIe error (bug 11028) */
 #define EFX_WORKAROUND_10727 EFX_WORKAROUND_ALWAYS
-/* Transmit flow control may get disabled */
-#define EFX_WORKAROUND_11482 EFX_WORKAROUND_FALCON_AB
 /* Truncated IPv4 packets can confuse the TX packet parser */
 #define EFX_WORKAROUND_15592 EFX_WORKAROUND_FALCON_AB
 /* Legacy ISR read can return zero once */