net/sfc: retrieve link info

Signed-off-by: Artem Andreev <artem.andreev@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@solarflare.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

doc/guides/nics/features/sfc_efx.ini

@@ -4,6 +4,7 @@
 ; Refer to default.ini for the full list of available PMD features.
 ;
 [Features]
+Link status          = Y
 BSD nic_uio          = Y
 Linux UIO            = Y
 Linux VFIO           = Y

doc/guides/nics/sfc_efx.rst

@@ -44,6 +44,8 @@ SFC EFX PMD has support for:
 
 - Multiple transmit and receive queues
 
+- Link state information
+
 
 Non-supported Features
 ----------------------

drivers/net/sfc/Makefile

@@ -37,6 +37,8 @@ CFLAGS += -I$(SRCDIR)/base/
 CFLAGS += -I$(SRCDIR)
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS)
+# Strict-aliasing rules are violated by rte_eth_link to uint64_t casts
+CFLAGS += -Wno-strict-aliasing
 
 # Enable extra warnings
 CFLAGS += -Wextra

drivers/net/sfc/sfc.h

@@ -218,6 +218,9 @@ int sfc_port_init(struct sfc_adapter *sa);
 void sfc_port_fini(struct sfc_adapter *sa);
 int sfc_port_start(struct sfc_adapter *sa);
 void sfc_port_stop(struct sfc_adapter *sa);
+void sfc_port_link_mode_to_info(efx_link_mode_t link_mode,
+				struct rte_eth_link *link_info);
+
 
 #ifdef __cplusplus
 }

drivers/net/sfc/sfc_ethdev.c

@@ -37,6 +37,7 @@
 #include "sfc_debug.h"
 #include "sfc_log.h"
 #include "sfc_kvargs.h"
+#include "sfc_ev.h"
 
 
 static void
@@ -99,6 +100,46 @@ sfc_dev_start(struct rte_eth_dev *dev)
 	return -rc;
 }
 
+static int
+sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
+{
+	struct sfc_adapter *sa = dev->data->dev_private;
+	struct rte_eth_link *dev_link = &dev->data->dev_link;
+	struct rte_eth_link old_link;
+	struct rte_eth_link current_link;
+
+	sfc_log_init(sa, "entry");
+
+	if (sa->state != SFC_ADAPTER_STARTED)
+		return 0;
+
+retry:
+	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
+	*(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
+
+	if (wait_to_complete) {
+		efx_link_mode_t link_mode;
+
+		efx_port_poll(sa->nic, &link_mode);
+		sfc_port_link_mode_to_info(link_mode, &current_link);
+
+		if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
+					 *(uint64_t *)&old_link,
+					 *(uint64_t *)&current_link))
+			goto retry;
+	} else {
+		sfc_ev_mgmt_qpoll(sa);
+		*(int64_t *)&current_link =
+			rte_atomic64_read((rte_atomic64_t *)dev_link);
+	}
+
+	if (old_link.link_status != current_link.link_status)
+		sfc_info(sa, "Link status is %s",
+			 current_link.link_status ? "UP" : "DOWN");
+
+	return old_link.link_status == current_link.link_status ? 0 : -1;
+}
+
 static void
 sfc_dev_stop(struct rte_eth_dev *dev)
 {
@@ -146,6 +187,7 @@ static const struct eth_dev_ops sfc_eth_dev_ops = {
 	.dev_start			= sfc_dev_start,
 	.dev_stop			= sfc_dev_stop,
 	.dev_close			= sfc_dev_close,
+	.link_update			= sfc_dev_link_update,
 	.dev_infos_get			= sfc_dev_infos_get,
 };
 

drivers/net/sfc/sfc_ev.c

@@ -181,13 +181,19 @@ sfc_ev_timer(void *arg, uint32_t index)
 }
 
 static boolean_t
-sfc_ev_link_change(void *arg, __rte_unused efx_link_mode_t link_mode)
+sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
 {
 	struct sfc_evq *evq = arg;
+	struct sfc_adapter *sa = evq->sa;
+	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
+	struct rte_eth_link new_link;
 
-	sfc_err(evq->sa, "EVQ %u unexpected link change",
+	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
-		evq->evq_index);
+
-	return B_TRUE;
+	sfc_port_link_mode_to_info(link_mode, &new_link);
+	rte_atomic64_set((rte_atomic64_t *)dev_link, *(uint64_t *)&new_link);
+
+	return B_FALSE;
 }
 
 static const efx_ev_callbacks_t sfc_ev_callbacks = {

drivers/net/sfc/sfc_port.c

@@ -129,3 +129,61 @@ sfc_port_fini(struct sfc_adapter *sa)
 
 	sfc_log_init(sa, "done");
 }
+
+void
+sfc_port_link_mode_to_info(efx_link_mode_t link_mode,
+			   struct rte_eth_link *link_info)
+{
+	SFC_ASSERT(link_mode < EFX_LINK_NMODES);
+
+	memset(link_info, 0, sizeof(*link_info));
+	if ((link_mode == EFX_LINK_DOWN) || (link_mode == EFX_LINK_UNKNOWN))
+		link_info->link_status = ETH_LINK_DOWN;
+	else
+		link_info->link_status = ETH_LINK_UP;
+
+	switch (link_mode) {
+	case EFX_LINK_10HDX:
+		link_info->link_speed  = ETH_SPEED_NUM_10M;
+		link_info->link_duplex = ETH_LINK_HALF_DUPLEX;
+		break;
+	case EFX_LINK_10FDX:
+		link_info->link_speed  = ETH_SPEED_NUM_10M;
+		link_info->link_duplex = ETH_LINK_FULL_DUPLEX;
+		break;
+	case EFX_LINK_100HDX:
+		link_info->link_speed  = ETH_SPEED_NUM_100M;
+		link_info->link_duplex = ETH_LINK_HALF_DUPLEX;
+		break;
+	case EFX_LINK_100FDX:
+		link_info->link_speed  = ETH_SPEED_NUM_100M;
+		link_info->link_duplex = ETH_LINK_FULL_DUPLEX;
+		break;
+	case EFX_LINK_1000HDX:
+		link_info->link_speed  = ETH_SPEED_NUM_1G;
+		link_info->link_duplex = ETH_LINK_HALF_DUPLEX;
+		break;
+	case EFX_LINK_1000FDX:
+		link_info->link_speed  = ETH_SPEED_NUM_1G;
+		link_info->link_duplex = ETH_LINK_FULL_DUPLEX;
+		break;
+	case EFX_LINK_10000FDX:
+		link_info->link_speed  = ETH_SPEED_NUM_10G;
+		link_info->link_duplex = ETH_LINK_FULL_DUPLEX;
+		break;
+	case EFX_LINK_40000FDX:
+		link_info->link_speed  = ETH_SPEED_NUM_40G;
+		link_info->link_duplex = ETH_LINK_FULL_DUPLEX;
+		break;
+	default:
+		SFC_ASSERT(B_FALSE);
+		/* FALLTHROUGH */
+	case EFX_LINK_UNKNOWN:
+	case EFX_LINK_DOWN:
+		link_info->link_speed  = ETH_SPEED_NUM_NONE;
+		link_info->link_duplex = 0;
+		break;
+	}
+
+	link_info->link_autoneg = ETH_LINK_AUTONEG;
+}