[dpdk-dev] [PATCH 2/2] net/mlx5: fix support for newer link speeds

[Nelio Laranjeiro <nelio.laranjeiro@6wind.com>]

Not all speed capabilities can be reported properly before Linux 4.8 (25G,
50G and 100G speeds are missing), moreover the API to retrieve them only
exists since Linux 4.5, this commit thus implements compatibility code for
all versions.

Fixes: e274f5732225 ("ethdev: add speed capabilities")

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
---
 drivers/net/mlx5/Makefile      |  15 +++++
 drivers/net/mlx5/mlx5_ethdev.c | 123 ++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 135 insertions(+), 3 deletions(-)

diff --git a/drivers/net/mlx5/Makefile b/drivers/net/mlx5/Makefile
index 2c13c30..cf87f0b 100644
--- a/drivers/net/mlx5/Makefile
+++ b/drivers/net/mlx5/Makefile
@@ -121,6 +121,21 @@ mlx5_autoconf.h.new: $(RTE_SDK)/scripts/auto-config-h.sh
 		infiniband/mlx5_hw.h \
 		enum MLX5_OPCODE_TSO \
 		$(AUTOCONF_OUTPUT)
+	$Q sh -- '$<' '$@' \
+		HAVE_ETHTOOL_LINK_MODE_25G \
+		/usr/include/linux/ethtool.h \
+		enum ETHTOOL_LINK_MODE_25000baseCR_Full_BIT \
+		$(AUTOCONF_OUTPUT)
+	$Q sh -- '$<' '$@' \
+		HAVE_ETHTOOL_LINK_MODE_50G \
+		/usr/include/linux/ethtool.h \
+		enum ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT \
+		$(AUTOCONF_OUTPUT)
+	$Q sh -- '$<' '$@' \
+		HAVE_ETHTOOL_LINK_MODE_100G \
+		/usr/include/linux/ethtool.h \
+		enum ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT \
+		$(AUTOCONF_OUTPUT)
 
 # Create mlx5_autoconf.h or update it in case it differs from the new one.
 
diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index 042c9bc..2d49f86 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -627,15 +627,15 @@ mlx5_dev_supported_ptypes_get(struct rte_eth_dev *dev)
 }
 
 /**
- * DPDK callback to retrieve physical link information (unlocked version).
+ * Retrieve physical link information (unlocked version using legacy ioctl).
  *
  * @param dev
  *   Pointer to Ethernet device structure.
  * @param wait_to_complete
  *   Wait for request completion (ignored).
  */
-int
-mlx5_link_update_unlocked(struct rte_eth_dev *dev, int wait_to_complete)
+static int
+mlx5_link_update_unlocked_gset(struct rte_eth_dev *dev, int wait_to_complete)
 {
 	struct priv *priv = mlx5_get_priv(dev);
 	struct ethtool_cmd edata = {
@@ -691,6 +691,123 @@ mlx5_link_update_unlocked(struct rte_eth_dev *dev, int wait_to_complete)
 }
 
 /**
+ * Retrieve physical link information (unlocked version using new ioctl from
+ * Linux 4.5).
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param wait_to_complete
+ *   Wait for request completion (ignored).
+ */
+static int
+mlx5_link_update_unlocked_gs(struct rte_eth_dev *dev, int wait_to_complete)
+{
+#ifdef ETHTOOL_GLINKSETTINGS
+	struct priv *priv = mlx5_get_priv(dev);
+	struct ethtool_link_settings edata = {
+		.cmd = ETHTOOL_GLINKSETTINGS,
+	};
+	struct ifreq ifr;
+	struct rte_eth_link dev_link;
+	uint64_t sc;
+
+	(void)wait_to_complete;
+	if (priv_ifreq(priv, SIOCGIFFLAGS, &ifr)) {
+		WARN("ioctl(SIOCGIFFLAGS) failed: %s", strerror(errno));
+		return -1;
+	}
+	memset(&dev_link, 0, sizeof(dev_link));
+	dev_link.link_status = ((ifr.ifr_flags & IFF_UP) &&
+				(ifr.ifr_flags & IFF_RUNNING));
+	ifr.ifr_data = (void *)&edata;
+	if (priv_ifreq(priv, SIOCETHTOOL, &ifr)) {
+		DEBUG("ioctl(SIOCETHTOOL, ETHTOOL_GLINKSETTINGS) failed: %s",
+		      strerror(errno));
+		return -1;
+	}
+	dev_link.link_speed = edata.speed;
+	sc = edata.link_mode_masks[0] |
+		((uint64_t)edata.link_mode_masks[1] << 32);
+	priv->link_speed_capa = 0;
+	/* Link speeds available in kernel v4.5. */
+	if (sc & ETHTOOL_LINK_MODE_Autoneg_BIT)
+		priv->link_speed_capa |= ETH_LINK_SPEED_AUTONEG;
+	if (sc & (ETHTOOL_LINK_MODE_1000baseT_Full_BIT |
+		  ETHTOOL_LINK_MODE_1000baseKX_Full_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_1G;
+	if (sc & (ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT |
+		  ETHTOOL_LINK_MODE_10000baseKR_Full_BIT |
+		  ETHTOOL_LINK_MODE_10000baseR_FEC_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_10G;
+	if (sc & (ETHTOOL_LINK_MODE_20000baseMLD2_Full_BIT |
+		  ETHTOOL_LINK_MODE_20000baseKR2_Full_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_20G;
+	if (sc & (ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_40G;
+	if (sc & (ETHTOOL_LINK_MODE_56000baseKR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_56000baseCR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_56000baseSR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_56G;
+	/* Link speeds available in kernel v4.6. */
+#ifdef HAVE_ETHTOOL_LINK_MODE_25G
+	if (sc & (ETHTOOL_LINK_MODE_25000baseCR_Full_BIT |
+		  ETHTOOL_LINK_MODE_25000baseKR_Full_BIT |
+		  ETHTOOL_LINK_MODE_25000baseSR_Full_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_25G;
+#endif
+#ifdef HAVE_ETHTOOL_LINK_MODE_50G
+	if (sc & (ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT |
+		  ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_50G;
+#endif
+#ifdef HAVE_ETHTOOL_LINK_MODE_100G
+	if (sc & (ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT |
+		  ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT))
+		priv->link_speed_capa |= ETH_LINK_SPEED_100G;
+#endif
+	dev_link.link_duplex = ((edata.duplex == DUPLEX_HALF) ?
+				ETH_LINK_HALF_DUPLEX : ETH_LINK_FULL_DUPLEX);
+	dev_link.link_autoneg = !(dev->data->dev_conf.link_speeds &
+				  ETH_LINK_SPEED_FIXED);
+	if (memcmp(&dev_link, &dev->data->dev_link, sizeof(dev_link))) {
+		/* Link status changed. */
+		dev->data->dev_link = dev_link;
+		return 0;
+	}
+#else
+	(void)dev;
+	(void)wait_to_complete;
+#endif
+	/* Link status is still the same. */
+	return -1;
+}
+
+/**
+ * DPDK callback to retrieve physical link information (unlocked version).
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param wait_to_complete
+ *   Wait for request completion (ignored).
+ */
+int
+mlx5_link_update_unlocked(struct rte_eth_dev *dev, int wait_to_complete)
+{
+	int ret;
+
+	ret = mlx5_link_update_unlocked_gs(dev, wait_to_complete);
+	if (ret < 0)
+		ret = mlx5_link_update_unlocked_gset(dev, wait_to_complete);
+	return ret;
+}
+
+/**
  * DPDK callback to retrieve physical link information.
  *
  * @param dev
-- 
2.1.4