net/mlx5: fix extended statistics

[dpdk.git] / drivers / net / mlx5 / mlx5_stats.c

diff --git a/drivers/net/mlx5/mlx5_stats.c b/drivers/net/mlx5/mlx5_stats.c
index a211841..1953293 100644 (file)
--- a/drivers/net/mlx5/mlx5_stats.c
+++ b/drivers/net/mlx5/mlx5_stats.c
@@ -175,6 +175,29 @@ priv_read_dev_counters(struct priv *priv, uint64_t *stats)
        return 0;
 }
 
+/**
+ * Query the number of statistics provided by ETHTOOL.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ *
+ * @return
+ *   Number of statistics on success, -1 on error.
+ */
+static int
+priv_ethtool_get_stats_n(struct priv *priv) {
+       struct ethtool_drvinfo drvinfo;
+       struct ifreq ifr;
+
+       drvinfo.cmd = ETHTOOL_GDRVINFO;
+       ifr.ifr_data = (caddr_t)&drvinfo;
+       if (priv_ifreq(priv, SIOCETHTOOL, &ifr) != 0) {
+               WARN("unable to query number of statistics");
+               return -1;
+       }
+       return drvinfo.n_stats;
+}
+
 /**
  * Init the structures to read device counters.
  *
@@ -188,19 +211,11 @@ priv_xstats_init(struct priv *priv)
        unsigned int i;
        unsigned int j;
        struct ifreq ifr;
-       struct ethtool_drvinfo drvinfo;
        struct ethtool_gstrings *strings = NULL;
        unsigned int dev_stats_n;
        unsigned int str_sz;
 
-       /* How many statistics are available. */
-       drvinfo.cmd = ETHTOOL_GDRVINFO;
-       ifr.ifr_data = (caddr_t)&drvinfo;
-       if (priv_ifreq(priv, SIOCETHTOOL, &ifr) != 0) {
-               WARN("unable to get driver info");
-               return;
-       }
-       dev_stats_n = drvinfo.n_stats;
+       dev_stats_n = priv_ethtool_get_stats_n(priv);
        if (dev_stats_n < 1) {
                WARN("no extended statistics available");
                return;
@@ -422,7 +437,15 @@ mlx5_xstats_get(struct rte_eth_dev *dev,
        int ret = xstats_n;
 
        if (n >= xstats_n && stats) {
+               struct mlx5_xstats_ctrl *xstats_ctrl = &priv->xstats_ctrl;
+               int stats_n;
+
                priv_lock(priv);
+               stats_n = priv_ethtool_get_stats_n(priv);
+               if (stats_n < 0)
+                       return -1;
+               if (xstats_ctrl->stats_n != stats_n)
+                       priv_xstats_init(priv);
                ret = priv_xstats_get(priv, stats);
                priv_unlock(priv);
        }
@@ -439,8 +462,15 @@ void
 mlx5_xstats_reset(struct rte_eth_dev *dev)
 {
        struct priv *priv = mlx5_get_priv(dev);
+       struct mlx5_xstats_ctrl *xstats_ctrl = &priv->xstats_ctrl;
+       int stats_n;
 
        priv_lock(priv);
+       stats_n = priv_ethtool_get_stats_n(priv);
+       if (stats_n < 0)
+               return;
+       if (xstats_ctrl->stats_n != stats_n)
+               priv_xstats_init(priv);
        priv_xstats_reset(priv);
        priv_unlock(priv);
 }