sfc_ef100: implement ndo_open/close and EVQ probing

Channels are probed, but actual event handling is still stubbed out.

Stub implementation of check_caps is needed because ptp.c will call into
 it from efx_ptp_use_mac_tx_timestamps() to decide if it wants TXQs.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef100_netdev.c

@@ -29,6 +29,147 @@ static void ef100_update_name(struct efx_nic *efx)
 	strcpy(efx->name, efx->net_dev->name);
 }
 
+static int ef100_alloc_vis(struct efx_nic *efx, unsigned int *allocated_vis)
+{
+	/* EF100 uses a single TXQ per channel, as all checksum offloading
+	 * is configured in the TX descriptor, and there is no TX Pacer for
+	 * HIGHPRI queues.
+	 */
+	unsigned int tx_vis = efx->n_tx_channels + efx->n_extra_tx_channels;
+	unsigned int rx_vis = efx->n_rx_channels;
+	unsigned int min_vis, max_vis;
+
+	EFX_WARN_ON_PARANOID(efx->tx_queues_per_channel != 1);
+
+	tx_vis += efx->n_xdp_channels * efx->xdp_tx_per_channel;
+
+	max_vis = max(rx_vis, tx_vis);
+	/* Currently don't handle resource starvation and only accept
+	 * our maximum needs and no less.
+	 */
+	min_vis = max_vis;
+
+	return efx_mcdi_alloc_vis(efx, min_vis, max_vis,
+				  NULL, allocated_vis);
+}
+
+static int ef100_remap_bar(struct efx_nic *efx, int max_vis)
+{
+	unsigned int uc_mem_map_size;
+	void __iomem *membase;
+
+	efx->max_vis = max_vis;
+	uc_mem_map_size = PAGE_ALIGN(max_vis * efx->vi_stride);
+
+	/* Extend the original UC mapping of the memory BAR */
+	membase = ioremap(efx->membase_phys, uc_mem_map_size);
+	if (!membase) {
+		netif_err(efx, probe, efx->net_dev,
+			  "could not extend memory BAR to %x\n",
+			  uc_mem_map_size);
+		return -ENOMEM;
+	}
+	iounmap(efx->membase);
+	efx->membase = membase;
+	return 0;
+}
+
+/* Context: process, rtnl_lock() held.
+ * Note that the kernel will ignore our return code; this method
+ * should really be a void.
+ */
+static int ef100_net_stop(struct net_device *net_dev)
+{
+	struct efx_nic *efx = netdev_priv(net_dev);
+
+	netif_dbg(efx, ifdown, efx->net_dev, "closing on CPU %d\n",
+		  raw_smp_processor_id());
+
+	netif_stop_queue(net_dev);
+	efx_stop_all(efx);
+	efx_disable_interrupts(efx);
+	efx_clear_interrupt_affinity(efx);
+	efx_nic_fini_interrupt(efx);
+	efx_fini_napi(efx);
+	efx_remove_channels(efx);
+	efx_mcdi_free_vis(efx);
+	efx_remove_interrupts(efx);
+
+	return 0;
+}
+
+/* Context: process, rtnl_lock() held. */
+static int ef100_net_open(struct net_device *net_dev)
+{
+	struct efx_nic *efx = netdev_priv(net_dev);
+	unsigned int allocated_vis;
+	int rc;
+
+	ef100_update_name(efx);
+	netif_dbg(efx, ifup, net_dev, "opening device on CPU %d\n",
+		  raw_smp_processor_id());
+
+	rc = efx_check_disabled(efx);
+	if (rc)
+		goto fail;
+
+	rc = efx_probe_interrupts(efx);
+	if (rc)
+		goto fail;
+
+	rc = efx_set_channels(efx);
+	if (rc)
+		goto fail;
+
+	rc = efx_mcdi_free_vis(efx);
+	if (rc)
+		goto fail;
+
+	rc = ef100_alloc_vis(efx, &allocated_vis);
+	if (rc)
+		goto fail;
+
+	rc = efx_probe_channels(efx);
+	if (rc)
+		return rc;
+
+	rc = ef100_remap_bar(efx, allocated_vis);
+	if (rc)
+		goto fail;
+
+	efx_init_napi(efx);
+
+	rc = efx_nic_init_interrupt(efx);
+	if (rc)
+		goto fail;
+	efx_set_interrupt_affinity(efx);
+
+	rc = efx_enable_interrupts(efx);
+	if (rc)
+		goto fail;
+
+	/* in case the MC rebooted while we were stopped, consume the change
+	 * to the warm reboot count
+	 */
+	(void) efx_mcdi_poll_reboot(efx);
+
+	efx_start_all(efx);
+
+	/* Link state detection is normally event-driven; we have
+	 * to poll now because we could have missed a change
+	 */
+	mutex_lock(&efx->mac_lock);
+	if (efx_mcdi_phy_poll(efx))
+		efx_link_status_changed(efx);
+	mutex_unlock(&efx->mac_lock);
+
+	return 0;
+
+fail:
+	ef100_net_stop(net_dev);
+	return rc;
+}
+
 /* Initiate a packet transmission.  We use one channel per CPU
  * (sharing when we have more CPUs than channels).
  *
@@ -64,6 +205,8 @@ err:
 }
 
 static const struct net_device_ops ef100_netdev_ops = {
+	.ndo_open               = ef100_net_open,
+	.ndo_stop               = ef100_net_stop,
 	.ndo_start_xmit         = ef100_hard_start_xmit,
 };