net/cnxk: support link status update

Add link status update callback to get current
link status.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>

doc/guides/nics/cnxk.rst

@@ -20,6 +20,7 @@ Features of the CNXK Ethdev PMD are:
 - Lock-free Tx queue
 - Multiple queues for TX and RX
 - Receiver Side Scaling (RSS)
+- Link state information
 
 Prerequisites
 -------------

doc/guides/nics/features/cnxk.ini

@@ -8,6 +8,8 @@ Speed capabilities   = Y
 Lock-free Tx queue   = Y
 SR-IOV               = Y
 Multiprocess aware   = Y
+Link status          = Y
+Link status event    = Y
 RSS hash             = Y
 Inner RSS            = Y
 Linux                = Y

doc/guides/nics/features/cnxk_vec.ini

@@ -8,6 +8,8 @@ Speed capabilities   = Y
 Lock-free Tx queue   = Y
 SR-IOV               = Y
 Multiprocess aware   = Y
+Link status          = Y
+Link status event    = Y
 RSS hash             = Y
 Inner RSS            = Y
 Linux                = Y

doc/guides/nics/features/cnxk_vf.ini

@@ -7,6 +7,8 @@
 Speed capabilities   = Y
 Lock-free Tx queue   = Y
 Multiprocess aware   = Y
+Link status          = Y
+Link status event    = Y
 RSS hash             = Y
 Inner RSS            = Y
 Linux                = Y

drivers/net/cnxk/cnxk_ethdev.c

@@ -601,6 +601,7 @@ fail_configure:
 /* CNXK platform independent eth dev ops */
 struct eth_dev_ops cnxk_eth_dev_ops = {
 	.dev_infos_get = cnxk_nix_info_get,
+	.link_update = cnxk_nix_link_update,
 };
 
 static int
@@ -635,6 +636,9 @@ cnxk_eth_dev_init(struct rte_eth_dev *eth_dev)
 		goto error;
 	}
 
+	/* Register up msg callbacks */
+	roc_nix_mac_link_cb_register(nix, cnxk_eth_dev_link_status_cb);
+
 	dev->eth_dev = eth_dev;
 	dev->configured = 0;
 
@@ -723,6 +727,9 @@ cnxk_eth_dev_uninit(struct rte_eth_dev *eth_dev, bool mbox_close)
 
 	roc_nix_npc_rx_ena_dis(nix, false);
 
+	/* Disable link status events */
+	roc_nix_mac_link_event_start_stop(nix, false);
+
 	/* Free up SQs */
 	for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
 		dev_ops->tx_queue_release(eth_dev->data->tx_queues[i]);

drivers/net/cnxk/cnxk_ethdev.h

@@ -15,6 +15,9 @@
 
 #define CNXK_ETH_DEV_PMD_VERSION "1.0"
 
+/* Used for struct cnxk_eth_dev::flags */
+#define CNXK_LINK_CFG_IN_PROGRESS_F BIT_ULL(0)
+
 /* VLAN tag inserted by NIX_TX_VTAG_ACTION.
  * In Tx space is always reserved for this in FRS.
  */
@@ -196,6 +199,11 @@ int cnxk_nix_configure(struct rte_eth_dev *eth_dev);
 uint32_t cnxk_rss_ethdev_to_nix(struct cnxk_eth_dev *dev, uint64_t ethdev_rss,
 				uint8_t rss_level);
 
+/* Link */
+void cnxk_eth_dev_link_status_cb(struct roc_nix *nix,
+				 struct roc_nix_link_info *link);
+int cnxk_nix_link_update(struct rte_eth_dev *eth_dev, int wait_to_complete);
+
 /* Devargs */
 int cnxk_ethdev_parse_devargs(struct rte_devargs *devargs,
 			      struct cnxk_eth_dev *dev);

drivers/net/cnxk/cnxk_link.c

@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2021 Marvell.
+ */
+
+#include "cnxk_ethdev.h"
+
+static inline int
+nix_wait_for_link_cfg(struct cnxk_eth_dev *dev)
+{
+	uint16_t wait = 1000;
+
+	do {
+		rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
+		if (!(dev->flags & CNXK_LINK_CFG_IN_PROGRESS_F))
+			break;
+		wait--;
+		rte_delay_ms(1);
+	} while (wait);
+
+	return wait ? 0 : -1;
+}
+
+static void
+nix_link_status_print(struct rte_eth_dev *eth_dev, struct rte_eth_link *link)
+{
+	if (link && link->link_status)
+		plt_info("Port %d: Link Up - speed %u Mbps - %s",
+			 (int)(eth_dev->data->port_id),
+			 (uint32_t)link->link_speed,
+			 link->link_duplex == ETH_LINK_FULL_DUPLEX
+				 ? "full-duplex"
+				 : "half-duplex");
+	else
+		plt_info("Port %d: Link Down", (int)(eth_dev->data->port_id));
+}
+
+void
+cnxk_eth_dev_link_status_cb(struct roc_nix *nix, struct roc_nix_link_info *link)
+{
+	struct cnxk_eth_dev *dev = (struct cnxk_eth_dev *)nix;
+	struct rte_eth_link eth_link;
+	struct rte_eth_dev *eth_dev;
+
+	if (!link || !nix)
+		return;
+
+	eth_dev = dev->eth_dev;
+	if (!eth_dev || !eth_dev->data->dev_conf.intr_conf.lsc)
+		return;
+
+	if (nix_wait_for_link_cfg(dev)) {
+		plt_err("Timeout waiting for link_cfg to complete");
+		return;
+	}
+
+	eth_link.link_status = link->status;
+	eth_link.link_speed = link->speed;
+	eth_link.link_autoneg = ETH_LINK_AUTONEG;
+	eth_link.link_duplex = link->full_duplex;
+
+	/* Print link info */
+	nix_link_status_print(eth_dev, &eth_link);
+
+	/* Update link info */
+	rte_eth_linkstatus_set(eth_dev, &eth_link);
+
+	/* Set the flag and execute application callbacks */
+	rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC, NULL);
+}
+
+int
+cnxk_nix_link_update(struct rte_eth_dev *eth_dev, int wait_to_complete)
+{
+	struct cnxk_eth_dev *dev = cnxk_eth_pmd_priv(eth_dev);
+	struct roc_nix_link_info info;
+	struct rte_eth_link link;
+	int rc;
+
+	RTE_SET_USED(wait_to_complete);
+	memset(&link, 0, sizeof(struct rte_eth_link));
+
+	if (roc_nix_is_sdp(&dev->nix))
+		return 0;
+
+	if (roc_nix_is_lbk(&dev->nix)) {
+		link.link_status = ETH_LINK_UP;
+		link.link_speed = ETH_SPEED_NUM_100G;
+		link.link_autoneg = ETH_LINK_FIXED;
+		link.link_duplex = ETH_LINK_FULL_DUPLEX;
+	} else {
+		rc = roc_nix_mac_link_info_get(&dev->nix, &info);
+		if (rc)
+			return rc;
+		link.link_status = info.status;
+		link.link_speed = info.speed;
+		link.link_autoneg = ETH_LINK_AUTONEG;
+		if (info.full_duplex)
+			link.link_duplex = info.full_duplex;
+	}
+
+	return rte_eth_linkstatus_set(eth_dev, &link);
+}

drivers/net/cnxk/meson.build

@@ -12,6 +12,7 @@ sources = files(
         'cnxk_ethdev.c',
         'cnxk_ethdev_devargs.c',
         'cnxk_ethdev_ops.c',
+        'cnxk_link.c',
 )
 
 # CN9K