[dpdk-dev] [PATCH v2] net/mlx5: fix link status query

[Shahaf Shuler <shahafs@mellanox.com>]

Trying to query the link status through new kernel ioctl API
ETHTOOL_GLINKSETTINGS was always failing due to kernel bug.
The bug was fixed on version 4.9
this patch uses the legacy ioctl API for lower kernels.

Fixes: 188408719888 ("net/mlx5: fix support for newer link speeds")
CC: stable@dpdk.org

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
---
on v2:
* remove HAVE_ETHTOOL_LINK_MODE_*

---
 drivers/net/mlx5/Makefile      | 15 ---------------
 drivers/net/mlx5/mlx5_ethdev.c | 12 +++---------
 2 files changed, 3 insertions(+), 24 deletions(-)

diff --git a/drivers/net/mlx5/Makefile b/drivers/net/mlx5/Makefile
index 671089c..0b8f7ba 100644
--- a/drivers/net/mlx5/Makefile
+++ b/drivers/net/mlx5/Makefile
@@ -122,21 +122,6 @@ mlx5_autoconf.h.new: $(RTE_SDK)/buildtools/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 8efdff7..53599fa 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -46,6 +46,7 @@
 #include <netinet/in.h>
 #include <linux/ethtool.h>
 #include <linux/sockios.h>
+#include <linux/version.h>
 #include <fcntl.h>
 
 /* DPDK headers don't like -pedantic. */
@@ -697,7 +698,7 @@ struct priv *
 
 /**
  * Retrieve physical link information (unlocked version using new ioctl from
- * Linux 4.5).
+ * Linux 4.9).
  *
  * @param dev
  *   Pointer to Ethernet device structure.
@@ -707,7 +708,7 @@ struct priv *
 static int
 mlx5_link_update_unlocked_gs(struct rte_eth_dev *dev, int wait_to_complete)
 {
-#ifdef ETHTOOL_GLINKSETTINGS
+#if KERNEL_VERSION(4, 9, 0) <= LINUX_VERSION_CODE
 	struct priv *priv = mlx5_get_priv(dev);
 	struct ethtool_link_settings edata = {
 		.cmd = ETHTOOL_GLINKSETTINGS,
@@ -757,25 +758,18 @@ struct priv *
 		  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 &
-- 
1.8.3.1