net: ngbe: add sriov function support

Add sriov_configure for driver ops.
Add mailbox handler wx_msg_task for ngbe in
the interrupt handler.
Add the notification flow when the vfs exist.

Signed-off-by: Mengyuan Lou <mengyuanlou@net-swift.com>
Link: https://patch.msgid.link/C9A0A43732966022+20250408091556.9640-6-mengyuanlou@net-swift.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/wangxun/libwx/wx_sriov.c

@@ -834,3 +834,34 @@ void wx_msg_task(struct wx *wx)
 	}
 }
 EXPORT_SYMBOL(wx_msg_task);
+
+void wx_disable_vf_rx_tx(struct wx *wx)
+{
+	wr32(wx, WX_TDM_VFTE_CLR(0), U32_MAX);
+	wr32(wx, WX_RDM_VFRE_CLR(0), U32_MAX);
+	if (wx->mac.type != wx_mac_em) {
+		wr32(wx, WX_TDM_VFTE_CLR(1), U32_MAX);
+		wr32(wx, WX_RDM_VFRE_CLR(1), U32_MAX);
+	}
+}
+EXPORT_SYMBOL(wx_disable_vf_rx_tx);
+
+void wx_ping_all_vfs_with_link_status(struct wx *wx, bool link_up)
+{
+	u32 msgbuf[2] = {0, 0};
+	u16 i;
+
+	if (!wx->num_vfs)
+		return;
+	msgbuf[0] = WX_PF_NOFITY_VF_LINK_STATUS | WX_PF_CONTROL_MSG;
+	if (link_up)
+		msgbuf[1] = FIELD_PREP(GENMASK(31, 1), wx->speed) | link_up;
+	if (wx->notify_down)
+		msgbuf[1] |= WX_PF_NOFITY_VF_NET_NOT_RUNNING;
+	for (i = 0; i < wx->num_vfs; i++) {
+		if (wx->vfinfo[i].clear_to_send)
+			msgbuf[0] |= WX_VT_MSGTYPE_CTS;
+		wx_write_mbx_pf(wx, msgbuf, 2, i);
+	}
+}
+EXPORT_SYMBOL(wx_ping_all_vfs_with_link_status);

drivers/net/ethernet/wangxun/libwx/wx_sriov.h

@@ -11,5 +11,7 @@
 void wx_disable_sriov(struct wx *wx);
 int wx_pci_sriov_configure(struct pci_dev *pdev, int num_vfs);
 void wx_msg_task(struct wx *wx);
+void wx_disable_vf_rx_tx(struct wx *wx);
+void wx_ping_all_vfs_with_link_status(struct wx *wx, bool link_up);
 
 #endif /* _WX_SRIOV_H_ */

drivers/net/ethernet/wangxun/libwx/wx_type.h

@@ -92,6 +92,7 @@
 /************************* Port Registers ************************************/
 /* port cfg Registers */
 #define WX_CFG_PORT_CTL              0x14400
+#define WX_CFG_PORT_CTL_PFRSTD       BIT(14)
 #define WX_CFG_PORT_CTL_DRV_LOAD     BIT(3)
 #define WX_CFG_PORT_CTL_QINQ         BIT(2)
 #define WX_CFG_PORT_CTL_D_VLAN       BIT(0) /* double vlan*/
@@ -1231,6 +1232,7 @@ struct wx {
 	u8 swfw_index;
 
 	/* PHY stuff */
+	bool notify_down;
 	unsigned int link;
 	int speed;
 	int duplex;

drivers/net/ethernet/wangxun/ngbe/ngbe_main.c

@@ -15,6 +15,8 @@
 #include "../libwx/wx_hw.h"
 #include "../libwx/wx_lib.h"
 #include "../libwx/wx_ptp.h"
+#include "../libwx/wx_mbx.h"
+#include "../libwx/wx_sriov.h"
 #include "ngbe_type.h"
 #include "ngbe_mdio.h"
 #include "ngbe_hw.h"
@@ -129,6 +131,10 @@ static int ngbe_sw_init(struct wx *wx)
 	wx->tx_work_limit = NGBE_DEFAULT_TX_WORK;
 	wx->rx_work_limit = NGBE_DEFAULT_RX_WORK;
 
+	wx->mbx.size = WX_VXMAILBOX_SIZE;
+	wx->setup_tc = ngbe_setup_tc;
+	set_bit(0, &wx->fwd_bitmask);
+
 	return 0;
 }
 
@@ -200,12 +206,10 @@ static irqreturn_t ngbe_intr(int __always_unused irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t ngbe_msix_other(int __always_unused irq, void *data)
+static irqreturn_t __ngbe_msix_misc(struct wx *wx, u32 eicr)
 {
-	struct wx *wx = data;
-	u32 eicr;
-
-	eicr = wx_misc_isb(wx, WX_ISB_MISC);
+	if (eicr & NGBE_PX_MISC_IC_VF_MBOX)
+		wx_msg_task(wx);
 
 	if (unlikely(eicr & NGBE_PX_MISC_IC_TIMESYNC))
 		wx_ptp_check_pps_event(wx);
@@ -217,6 +221,35 @@ static irqreturn_t ngbe_msix_other(int __always_unused irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t ngbe_msix_misc(int __always_unused irq, void *data)
+{
+	struct wx *wx = data;
+	u32 eicr;
+
+	eicr = wx_misc_isb(wx, WX_ISB_MISC);
+
+	return __ngbe_msix_misc(wx, eicr);
+}
+
+static irqreturn_t ngbe_misc_and_queue(int __always_unused irq, void *data)
+{
+	struct wx_q_vector *q_vector;
+	struct wx *wx = data;
+	u32 eicr;
+
+	eicr = wx_misc_isb(wx, WX_ISB_MISC);
+	if (!eicr) {
+		/* queue */
+		q_vector = wx->q_vector[0];
+		napi_schedule_irqoff(&q_vector->napi);
+		if (netif_running(wx->netdev))
+			ngbe_irq_enable(wx, true);
+		return IRQ_HANDLED;
+	}
+
+	return __ngbe_msix_misc(wx, eicr);
+}
+
 /**
  * ngbe_request_msix_irqs - Initialize MSI-X interrupts
  * @wx: board private structure
@@ -249,8 +282,16 @@ static int ngbe_request_msix_irqs(struct wx *wx)
 		}
 	}
 
-	err = request_irq(wx->msix_entry->vector,
-			  ngbe_msix_other, 0, netdev->name, wx);
+	/* Due to hardware design, when num_vfs < 7, pf can use 0 for misc and 1
+	 * for queue. But when num_vfs == 7, vector[1] is assigned to vf6.
+	 * Misc and queue should reuse interrupt vector[0].
+	 */
+	if (wx->num_vfs == 7)
+		err = request_irq(wx->msix_entry->vector,
+				  ngbe_misc_and_queue, 0, netdev->name, wx);
+	else
+		err = request_irq(wx->msix_entry->vector,
+				  ngbe_msix_misc, 0, netdev->name, wx);
 
 	if (err) {
 		wx_err(wx, "request_irq for msix_other failed: %d\n", err);
@@ -302,6 +343,22 @@ static void ngbe_disable_device(struct wx *wx)
 	struct net_device *netdev = wx->netdev;
 	u32 i;
 
+	if (wx->num_vfs) {
+		/* Clear EITR Select mapping */
+		wr32(wx, WX_PX_ITRSEL, 0);
+
+		/* Mark all the VFs as inactive */
+		for (i = 0; i < wx->num_vfs; i++)
+			wx->vfinfo[i].clear_to_send = 0;
+		wx->notify_down = true;
+		/* ping all the active vfs to let them know we are going down */
+		wx_ping_all_vfs_with_link_status(wx, false);
+		wx->notify_down = false;
+
+		/* Disable all VFTE/VFRE TX/RX */
+		wx_disable_vf_rx_tx(wx);
+	}
+
 	/* disable all enabled rx queues */
 	for (i = 0; i < wx->num_rx_queues; i++)
 		/* this call also flushes the previous write */
@@ -324,12 +381,19 @@ static void ngbe_disable_device(struct wx *wx)
 	wx_update_stats(wx);
 }
 
+static void ngbe_reset(struct wx *wx)
+{
+	wx_flush_sw_mac_table(wx);
+	wx_mac_set_default_filter(wx, wx->mac.addr);
+	if (test_bit(WX_STATE_PTP_RUNNING, wx->state))
+		wx_ptp_reset(wx);
+}
+
 void ngbe_down(struct wx *wx)
 {
 	phylink_stop(wx->phylink);
 	ngbe_disable_device(wx);
-	if (test_bit(WX_STATE_PTP_RUNNING, wx->state))
-		wx_ptp_reset(wx);
+	ngbe_reset(wx);
 	wx_clean_all_tx_rings(wx);
 	wx_clean_all_rx_rings(wx);
 }
@@ -352,6 +416,11 @@ void ngbe_up(struct wx *wx)
 		ngbe_sfp_modules_txrx_powerctl(wx, true);
 
 	phylink_start(wx->phylink);
+	/* Set PF Reset Done bit so PF/VF Mail Ops can work */
+	wr32m(wx, WX_CFG_PORT_CTL,
+	      WX_CFG_PORT_CTL_PFRSTD, WX_CFG_PORT_CTL_PFRSTD);
+	if (wx->num_vfs)
+		wx_ping_all_vfs_with_link_status(wx, false);
 }
 
 /**
@@ -596,6 +665,10 @@ static int ngbe_probe(struct pci_dev *pdev,
 		goto err_pci_release_regions;
 	}
 
+	/* The emerald supports up to 8 VFs per pf, but physical
+	 * function also need one pool for basic networking.
+	 */
+	pci_sriov_set_totalvfs(pdev, NGBE_MAX_VFS_DRV_LIMIT);
 	wx->driver_name = ngbe_driver_name;
 	ngbe_set_ethtool_ops(netdev);
 	netdev->netdev_ops = &ngbe_netdev_ops;
@@ -743,6 +816,7 @@ static void ngbe_remove(struct pci_dev *pdev)
 	struct net_device *netdev;
 
 	netdev = wx->netdev;
+	wx_disable_sriov(wx);
 	unregister_netdev(netdev);
 	phylink_destroy(wx->phylink);
 	pci_release_selected_regions(pdev,
@@ -802,6 +876,7 @@ static struct pci_driver ngbe_driver = {
 	.suspend  = ngbe_suspend,
 	.resume   = ngbe_resume,
 	.shutdown = ngbe_shutdown,
+	.sriov_configure = wx_pci_sriov_configure,
 };
 
 module_pci_driver(ngbe_driver);

drivers/net/ethernet/wangxun/ngbe/ngbe_mdio.c

@@ -9,6 +9,7 @@
 #include "../libwx/wx_type.h"
 #include "../libwx/wx_ptp.h"
 #include "../libwx/wx_hw.h"
+#include "../libwx/wx_sriov.h"
 #include "ngbe_type.h"
 #include "ngbe_mdio.h"
 
@@ -70,6 +71,8 @@ static void ngbe_mac_link_down(struct phylink_config *config,
 	wx->speed = SPEED_UNKNOWN;
 	if (test_bit(WX_STATE_PTP_RUNNING, wx->state))
 		wx_ptp_reset_cyclecounter(wx);
+	/* ping all the active vfs to let them know we are going down */
+	wx_ping_all_vfs_with_link_status(wx, false);
 }
 
 static void ngbe_mac_link_up(struct phylink_config *config,
@@ -114,6 +117,8 @@ static void ngbe_mac_link_up(struct phylink_config *config,
 	wx->last_rx_ptp_check = jiffies;
 	if (test_bit(WX_STATE_PTP_RUNNING, wx->state))
 		wx_ptp_reset_cyclecounter(wx);
+	/* ping all the active vfs to let them know we are going up */
+	wx_ping_all_vfs_with_link_status(wx, true);
 }
 
 static const struct phylink_mac_ops ngbe_mac_ops = {

drivers/net/ethernet/wangxun/ngbe/ngbe_type.h

@@ -73,12 +73,14 @@
 #define NGBE_PX_MISC_IEN_TIMESYNC		BIT(11)
 #define NGBE_PX_MISC_IEN_ETH_LK			BIT(18)
 #define NGBE_PX_MISC_IEN_INT_ERR		BIT(20)
+#define NGBE_PX_MISC_IC_VF_MBOX			BIT(23)
 #define NGBE_PX_MISC_IEN_GPIO			BIT(26)
 #define NGBE_PX_MISC_IEN_MASK ( \
 				NGBE_PX_MISC_IEN_DEV_RST | \
 				NGBE_PX_MISC_IEN_TIMESYNC | \
 				NGBE_PX_MISC_IEN_ETH_LK | \
 				NGBE_PX_MISC_IEN_INT_ERR | \
+				NGBE_PX_MISC_IC_VF_MBOX | \
 				NGBE_PX_MISC_IEN_GPIO)
 
 /* Extended Interrupt Cause Read */
@@ -134,6 +136,7 @@
 #define NGBE_MAX_RXD				8192
 #define NGBE_MIN_RXD				128
 
+#define NGBE_MAX_VFS_DRV_LIMIT			7
 extern char ngbe_driver_name[];
 
 void ngbe_down(struct wx *wx);