net/e1000: support xstats by ID

To achieve functionality of retrieving only specific statistics
given by application there are two new functions added:
eth_igb_xstats_get_by_ids() which retrieve
values of statistics specified by ids array
and eth_igb_xstats_get_names_by_ids() which retrieve
names of statistics specified by ids array.

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Signed-off-by: Kuba Kozak <kubax.kozak@intel.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

diff --git a/drivers/net/e1000/igb_ethdev.c b/drivers/net/e1000/igb_ethdev.c
index 2bda4b3..ca9f98c 100644 (file)
--- a/drivers/net/e1000/igb_ethdev.c
+++ b/drivers/net/e1000/igb_ethdev.c
@@ -116,9 +116,13 @@ static void eth_igb_stats_get(struct rte_eth_dev *dev,
                                struct rte_eth_stats *rte_stats);
 static int eth_igb_xstats_get(struct rte_eth_dev *dev,
                              struct rte_eth_xstat *xstats, unsigned n);
+static int eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+               uint64_t *values, unsigned int n);
 static int eth_igb_xstats_get_names(struct rte_eth_dev *dev,
-                                   struct rte_eth_xstat_name *xstats_names,
-                                   unsigned limit);
+               struct rte_eth_xstat_name *xstats_names, unsigned int limit);
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+               struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+               unsigned int limit);
 static void eth_igb_stats_reset(struct rte_eth_dev *dev);
 static void eth_igb_xstats_reset(struct rte_eth_dev *dev);
 static int eth_igb_fw_version_get(struct rte_eth_dev *dev,
@@ -389,6 +393,8 @@ static const struct eth_dev_ops eth_igb_ops = {
        .link_update          = eth_igb_link_update,
        .stats_get            = eth_igb_stats_get,
        .xstats_get           = eth_igb_xstats_get,
+       .xstats_get_by_ids    = eth_igb_xstats_get_by_ids,
+       .xstats_get_names_by_ids = eth_igb_xstats_get_names_by_ids,
        .xstats_get_names     = eth_igb_xstats_get_names,
        .stats_reset          = eth_igb_stats_reset,
        .xstats_reset         = eth_igb_xstats_reset,
@@ -1862,6 +1868,41 @@ static int eth_igb_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
        return IGB_NB_XSTATS;
 }
 
+static int eth_igb_xstats_get_names_by_ids(struct rte_eth_dev *dev,
+               struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+               unsigned int limit)
+{
+       unsigned int i;
+
+       if (!ids) {
+               if (xstats_names == NULL)
+                       return IGB_NB_XSTATS;
+
+               for (i = 0; i < IGB_NB_XSTATS; i++)
+                       snprintf(xstats_names[i].name,
+                                       sizeof(xstats_names[i].name),
+                                       "%s", rte_igb_stats_strings[i].name);
+
+               return IGB_NB_XSTATS;
+
+       } else {
+               struct rte_eth_xstat_name xstats_names_copy[IGB_NB_XSTATS];
+
+               eth_igb_xstats_get_names_by_ids(dev, xstats_names_copy, NULL,
+                               IGB_NB_XSTATS);
+
+               for (i = 0; i < limit; i++) {
+                       if (ids[i] >= IGB_NB_XSTATS) {
+                               PMD_INIT_LOG(ERR, "id value isn't valid");
+                               return -1;
+                       }
+                       strcpy(xstats_names[i].name,
+                                       xstats_names_copy[ids[i]].name);
+               }
+               return limit;
+       }
+}
+
 static int
 eth_igb_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
                   unsigned n)
@@ -1892,6 +1933,53 @@ eth_igb_xstats_get(struct rte_eth_dev *dev, struct rte_eth_xstat *xstats,
        return IGB_NB_XSTATS;
 }
 
+static int
+eth_igb_xstats_get_by_ids(struct rte_eth_dev *dev, uint64_t *ids,
+               uint64_t *values, unsigned int n)
+{
+       unsigned int i;
+
+       if (!ids) {
+               struct e1000_hw *hw =
+                       E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+               struct e1000_hw_stats *hw_stats =
+                       E1000_DEV_PRIVATE_TO_STATS(dev->data->dev_private);
+
+               if (n < IGB_NB_XSTATS)
+                       return IGB_NB_XSTATS;
+
+               igb_read_stats_registers(hw, hw_stats);
+
+               /* If this is a reset xstats is NULL, and we have cleared the
+                * registers by reading them.
+                */
+               if (!values)
+                       return 0;
+
+               /* Extended stats */
+               for (i = 0; i < IGB_NB_XSTATS; i++)
+                       values[i] = *(uint64_t *)(((char *)hw_stats) +
+                                       rte_igb_stats_strings[i].offset);
+
+               return IGB_NB_XSTATS;
+
+       } else {
+               uint64_t values_copy[IGB_NB_XSTATS];
+
+               eth_igb_xstats_get_by_ids(dev, NULL, values_copy,
+                               IGB_NB_XSTATS);
+
+               for (i = 0; i < n; i++) {
+                       if (ids[i] >= IGB_NB_XSTATS) {
+                               PMD_INIT_LOG(ERR, "id value isn't valid");
+                               return -1;
+                       }
+                       values[i] = values_copy[ids[i]];
+               }
+               return n;
+       }
+}
+
 static void
 igbvf_read_stats_registers(struct e1000_hw *hw, struct e1000_vf_stats *hw_stats)
 {