sfc_ef100: process events for MCDI completions

Currently RX and TX-completion events are unhandled, as neither the RX
 nor the TX path has been implemented yet.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef100_nic.c

@@ -160,7 +160,62 @@ static void ef100_ev_read_ack(struct efx_channel *channel)
 
 static int ef100_ev_process(struct efx_channel *channel, int quota)
 {
-	return 0;
+	struct efx_nic *efx = channel->efx;
+	struct ef100_nic_data *nic_data;
+	bool evq_phase, old_evq_phase;
+	unsigned int read_ptr;
+	efx_qword_t *p_event;
+	int spent = 0;
+	bool ev_phase;
+	int ev_type;
+
+	if (unlikely(!channel->enabled))
+		return 0;
+
+	nic_data = efx->nic_data;
+	evq_phase = test_bit(channel->channel, nic_data->evq_phases);
+	old_evq_phase = evq_phase;
+	read_ptr = channel->eventq_read_ptr;
+	BUILD_BUG_ON(ESF_GZ_EV_RXPKTS_PHASE_LBN != ESF_GZ_EV_TXCMPL_PHASE_LBN);
+
+	while (spent < quota) {
+		p_event = efx_event(channel, read_ptr);
+
+		ev_phase = !!EFX_QWORD_FIELD(*p_event, ESF_GZ_EV_RXPKTS_PHASE);
+		if (ev_phase != evq_phase)
+			break;
+
+		netif_vdbg(efx, drv, efx->net_dev,
+			   "processing event on %d " EFX_QWORD_FMT "\n",
+			   channel->channel, EFX_QWORD_VAL(*p_event));
+
+		ev_type = EFX_QWORD_FIELD(*p_event, ESF_GZ_E_TYPE);
+
+		switch (ev_type) {
+		case ESE_GZ_EF100_EV_MCDI:
+			efx_mcdi_process_event(channel, p_event);
+			break;
+		case ESE_GZ_EF100_EV_DRIVER:
+			netif_info(efx, drv, efx->net_dev,
+				   "Driver initiated event " EFX_QWORD_FMT "\n",
+				   EFX_QWORD_VAL(*p_event));
+			break;
+		default:
+			netif_info(efx, drv, efx->net_dev,
+				   "Unhandled event " EFX_QWORD_FMT "\n",
+				   EFX_QWORD_VAL(*p_event));
+		}
+
+		++read_ptr;
+		if ((read_ptr & channel->eventq_mask) == 0)
+			evq_phase = !evq_phase;
+	}
+
+	channel->eventq_read_ptr = read_ptr;
+	if (evq_phase != old_evq_phase)
+		change_bit(channel->channel, nic_data->evq_phases);
+
+	return spent;
 }
 
 static irqreturn_t ef100_msi_interrupt(int irq, void *dev_id)