From: Jacek Piasecki <jacekx.piase...@intel.com>

Extended xstats API in ethdev library to allow grouping of stats
logically so they can be retrieved per logical grouping  managed
by the application.
Changed existing functions rte_eth_xstats_get_names and
rte_eth_xstats_get to use a new list of arguments: array of ids
and array of values. ABI versioning mechanism was used to
support backward compatibility.
Introduced two new functions rte_eth_xstats_get_all and
rte_eth_xstats_get_names_all which keeps functionality of the
previous ones (respectively rte_eth_xstats_get and
rte_eth_xstats_get_names) but use new API inside.
Both functions marked as deprecated.
Introduced new function: rte_eth_xstats_get_id_by_name
to retrieve xstats ids by its names.

test-pmd: add support for new xstats API retrieving by id in
testpmd application: xstats_get() and
xstats_get_names() call with modified parameters.

proc_info: add support for new xstats API retrieving by id to
proc_info application. There is a new argument --xstats-ids
in proc_info command line to retrieve statistics given by ids.
E.g. --xstats-ids="1,3,5,7,8"

doc: add description for modified xstats API
Documentation change for modified extended statistics API functions.
The old API only allows retrieval of *all* of the NIC statistics
at once. Given this requires a MMIO read PCI transaction per statistic
it is an inefficient way of retrieving just a few key statistics.
Often a monitoring agent only has an interest in a few key statistics,
and the old API forces wasting CPU time and PCIe bandwidth in retrieving
*all* statistics; even those that the application didn't explicitly
show an interest in.
The new, more flexible API allow retrieval of statistics per ID.
If a PMD wishes, it can be implemented to read just the required
NIC registers. As a result, the monitoring application no longer wastes
PCIe bandwidth and CPU time.

Signed-off-by: Jacek Piasecki <jacekx.piase...@intel.com>
Signed-off-by: Kuba Kozak <kubax.ko...@intel.com>
Signed-off-by: Tomasz Kulasek <tomaszx.kula...@intel.com>
---
 app/proc_info/main.c                    | 150 ++++++++++-
 app/test-pmd/config.c                   |  19 +-
 doc/guides/prog_guide/poll_mode_drv.rst | 174 +++++++++++--
 lib/librte_ether/rte_ethdev.c           | 430 ++++++++++++++++++++++++--------
 lib/librte_ether/rte_ethdev.h           | 170 ++++++++++++-
 lib/librte_ether/rte_ether_version.map  |   5 +
 6 files changed, 794 insertions(+), 154 deletions(-)

diff --git a/app/proc_info/main.c b/app/proc_info/main.c
index d576b42..d0eae4b 100644
--- a/app/proc_info/main.c
+++ b/app/proc_info/main.c
@@ -86,6 +86,14 @@
 static uint32_t reset_xstats;
 /**< Enable memory info. */
 static uint32_t mem_info;
+/**< Enable displaying xstat name. */
+static uint32_t enable_xstats_name;
+static char *xstats_name;
+
+/**< Enable xstats by ids. */
+#define MAX_NB_XSTATS_IDS 1024
+static uint32_t nb_xstats_ids;
+static uint64_t xstats_ids[MAX_NB_XSTATS_IDS];
 
 /**< display usage */
 static void
@@ -97,8 +105,9 @@
                "  --stats: to display port statistics, enabled by default\n"
                "  --xstats: to display extended port statistics, disabled by "
                        "default\n"
-               "  --metrics: to display derived metrics of the ports, disabled 
by "
-                       "default\n"
+               "  --xstats-name NAME: to display single xstat value by NAME\n"
+               "  --xstats-ids IDLIST: to display xstat values by id. "
+                       "The argument is comma-separated list of xstat ids to 
print out.\n"
                "  --stats-reset: to reset port statistics\n"
                "  --xstats-reset: to reset port extended statistics\n"
                "  --collectd-format: to print statistics to STDOUT in expected 
by collectd format\n"
@@ -132,6 +141,33 @@
 
 }
 
+/*
+ * Parse ids value list into array
+ */
+static int
+parse_xstats_ids(char *list, uint64_t *ids, int limit) {
+       int length;
+       char *token;
+       char *ctx = NULL;
+       char *endptr;
+
+       length = 0;
+       token = strtok_r(list, ",", &ctx);
+       while (token != NULL) {
+               ids[length] = strtoull(token, &endptr, 10);
+               if (*endptr != '\0')
+                       return -EINVAL;
+
+               length++;
+               if (length >= limit)
+                       return -E2BIG;
+
+               token = strtok_r(NULL, ",", &ctx);
+       }
+
+       return length;
+}
+
 static int
 proc_info_preparse_args(int argc, char **argv)
 {
@@ -178,7 +214,9 @@
                {"xstats", 0, NULL, 0},
                {"metrics", 0, NULL, 0},
                {"xstats-reset", 0, NULL, 0},
+               {"xstats-name", required_argument, NULL, 1},
                {"collectd-format", 0, NULL, 0},
+               {"xstats-ids", 1, NULL, 1},
                {"host-id", 0, NULL, 0},
                {NULL, 0, 0, 0}
        };
@@ -224,7 +262,28 @@
                                        MAX_LONG_OPT_SZ))
                                reset_xstats = 1;
                        break;
+               case 1:
+                       /* Print xstat single value given by name*/
+                       if (!strncmp(long_option[option_index].name,
+                                       "xstats-name", MAX_LONG_OPT_SZ)) {
+                               enable_xstats_name = 1;
+                               xstats_name = optarg;
+                               printf("name:%s:%s\n",
+                                               long_option[option_index].name,
+                                               optarg);
+                       } else if (!strncmp(long_option[option_index].name,
+                                       "xstats-ids",
+                                       MAX_LONG_OPT_SZ))       {
+                               nb_xstats_ids = parse_xstats_ids(optarg,
+                                               xstats_ids, MAX_NB_XSTATS_IDS);
+
+                               if (nb_xstats_ids <= 0) {
+                                       printf("xstats-id list parse error.\n");
+                                       return -1;
+                               }
 
+                       }
+                       break;
                default:
                        proc_info_usage(prgname);
                        return -1;
@@ -351,20 +410,82 @@ static void collectd_resolve_cnt_type(char *cnt_type, 
size_t cnt_type_len,
 }
 
 static void
+nic_xstats_by_name_display(uint8_t port_id, char *name)
+{
+       uint64_t id;
+
+       printf("###### NIC statistics for port %-2d, statistic name '%s':\n",
+                          port_id, name);
+
+       if (rte_eth_xstats_get_id_by_name(port_id, name, &id) == 0)
+               printf("%s: %"PRIu64"\n", name, id);
+       else
+               printf("Statistic not found...\n");
+
+}
+
+static void
+nic_xstats_by_ids_display(uint8_t port_id, uint64_t *ids, int len)
+{
+       struct rte_eth_xstat_name *xstats_names;
+       uint64_t *values;
+       int ret, i;
+       static const char *nic_stats_border = "########################";
+
+       values = malloc(sizeof(values) * len);
+       if (values == NULL) {
+               printf("Cannot allocate memory for xstats\n");
+               return;
+       }
+
+       xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+       if (xstats_names == NULL) {
+               printf("Cannot allocate memory for xstat names\n");
+               free(values);
+               return;
+       }
+
+       if (len != rte_eth_xstats_get_names(
+                       port_id, xstats_names, len, ids)) {
+               printf("Cannot get xstat names\n");
+               goto err;
+       }
+
+       printf("###### NIC extended statistics for port %-2d #########\n",
+                          port_id);
+       printf("%s############################\n", nic_stats_border);
+       ret = rte_eth_xstats_get(port_id, ids, values, len);
+       if (ret < 0 || ret > len) {
+               printf("Cannot get xstats\n");
+               goto err;
+       }
+
+       for (i = 0; i < len; i++)
+               printf("%s: %"PRIu64"\n",
+                       xstats_names[i].name,
+                       values[i]);
+
+       printf("%s############################\n", nic_stats_border);
+err:
+       free(values);
+       free(xstats_names);
+}
+
+static void
 nic_xstats_display(uint8_t port_id)
 {
        struct rte_eth_xstat_name *xstats_names;
-       struct rte_eth_xstat *xstats;
+       uint64_t *values;
        int len, ret, i;
        static const char *nic_stats_border = "########################";
 
-       len = rte_eth_xstats_get_names(port_id, NULL, 0);
+       len = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
        if (len < 0) {
                printf("Cannot get xstats count\n");
                return;
        }
-       xstats = malloc(sizeof(xstats[0]) * len);
-       if (xstats == NULL) {
+       values = malloc(sizeof(values) * len);
+       if (values == NULL) {
                printf("Cannot allocate memory for xstats\n");
                return;
        }
@@ -372,11 +493,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, 
size_t cnt_type_len,
        xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
        if (xstats_names == NULL) {
                printf("Cannot allocate memory for xstat names\n");
-               free(xstats);
+               free(values);
                return;
        }
        if (len != rte_eth_xstats_get_names(
-                       port_id, xstats_names, len)) {
+                       port_id, xstats_names, len, NULL)) {
                printf("Cannot get xstat names\n");
                goto err;
        }
@@ -385,7 +506,7 @@ static void collectd_resolve_cnt_type(char *cnt_type, 
size_t cnt_type_len,
                           port_id);
        printf("%s############################\n",
                           nic_stats_border);
-       ret = rte_eth_xstats_get(port_id, xstats, len);
+       ret = rte_eth_xstats_get(port_id, NULL, values, len);
        if (ret < 0 || ret > len) {
                printf("Cannot get xstats\n");
                goto err;
@@ -401,18 +522,18 @@ static void collectd_resolve_cnt_type(char *cnt_type, 
size_t cnt_type_len,
                                                  xstats_names[i].name);
                        sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
                                PRIu64"\n", host_id, port_id, counter_type,
-                               xstats_names[i].name, xstats[i].value);
+                               xstats_names[i].name, values[i]);
                        write(stdout_fd, buf, strlen(buf));
                } else {
                        printf("%s: %"PRIu64"\n", xstats_names[i].name,
-                              xstats[i].value);
+                                       values[i]);
                }
        }
 
        printf("%s############################\n",
                           nic_stats_border);
 err:
-       free(xstats);
+       free(values);
        free(xstats_names);
 }
 
@@ -551,6 +672,11 @@ static void collectd_resolve_cnt_type(char *cnt_type, 
size_t cnt_type_len,
                                nic_stats_clear(i);
                        else if (reset_xstats)
                                nic_xstats_clear(i);
+                       else if (enable_xstats_name)
+                               nic_xstats_by_name_display(i, xstats_name);
+                       else if (nb_xstats_ids > 0)
+                               nic_xstats_by_ids_display(i, xstats_ids,
+                                               nb_xstats_ids);
                        else if (enable_metrics)
                                metrics_display(i);
                }
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 4d873cd..ef07925 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -264,9 +264,9 @@ struct rss_type_info {
 void
 nic_xstats_display(portid_t port_id)
 {
-       struct rte_eth_xstat *xstats;
        int cnt_xstats, idx_xstat;
        struct rte_eth_xstat_name *xstats_names;
+       uint64_t *values;
 
        printf("###### NIC extended statistics for port %-2d\n", port_id);
        if (!rte_eth_dev_is_valid_port(port_id)) {
@@ -275,7 +275,7 @@ struct rss_type_info {
        }
 
        /* Get count */
-       cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0);
+       cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
        if (cnt_xstats  < 0) {
                printf("Error: Cannot get count of xstats\n");
                return;
@@ -288,23 +288,24 @@ struct rss_type_info {
                return;
        }
        if (cnt_xstats != rte_eth_xstats_get_names(
-                       port_id, xstats_names, cnt_xstats)) {
+                       port_id, xstats_names, cnt_xstats, NULL)) {
                printf("Error: Cannot get xstats lookup\n");
                free(xstats_names);
                return;
        }
 
        /* Get stats themselves */
-       xstats = malloc(sizeof(struct rte_eth_xstat) * cnt_xstats);
-       if (xstats == NULL) {
+       values = malloc(sizeof(values) * cnt_xstats);
+       if (values == NULL) {
                printf("Cannot allocate memory for xstats\n");
                free(xstats_names);
                return;
        }
-       if (cnt_xstats != rte_eth_xstats_get(port_id, xstats, cnt_xstats)) {
+       if (cnt_xstats != rte_eth_xstats_get(port_id, NULL, values,
+                       cnt_xstats)) {
                printf("Error: Unable to get xstats\n");
                free(xstats_names);
-               free(xstats);
+               free(values);
                return;
        }
 
@@ -312,9 +313,9 @@ struct rss_type_info {
        for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++)
                printf("%s: %"PRIu64"\n",
                        xstats_names[idx_xstat].name,
-                       xstats[idx_xstat].value);
+                       values[idx_xstat]);
        free(xstats_names);
-       free(xstats);
+       free(values);
 }
 
 void
diff --git a/doc/guides/prog_guide/poll_mode_drv.rst 
b/doc/guides/prog_guide/poll_mode_drv.rst
index e48c121..3372f30 100644
--- a/doc/guides/prog_guide/poll_mode_drv.rst
+++ b/doc/guides/prog_guide/poll_mode_drv.rst
@@ -334,24 +334,20 @@ The Ethernet device API exported by the Ethernet PMDs is 
described in the *DPDK
 Extended Statistics API
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-The extended statistics API allows each individual PMD to expose a unique set
-of statistics. Accessing these from application programs is done via two
-functions:
-
-* ``rte_eth_xstats_get``: Fills in an array of ``struct rte_eth_xstat``
-  with extended statistics.
-* ``rte_eth_xstats_get_names``: Fills in an array of
-  ``struct rte_eth_xstat_name`` with extended statistic name lookup
-  information.
-
-Each ``struct rte_eth_xstat`` contains an identifier and value pair, and
-each ``struct rte_eth_xstat_name`` contains a string. Each identifier
-within the ``struct rte_eth_xstat`` lookup array must have a corresponding
-entry in the ``struct rte_eth_xstat_name`` lookup array. Within the latter
-the index of the entry is the identifier the string is associated with.
-These identifiers, as well as the number of extended statistic exposed, must
-remain constant during runtime. Note that extended statistic identifiers are
-driver-specific, and hence might not be the same for different ports.
+The extended statistics API allows a PMD to expose all statistics that are
+available to it, including statistics that are unique to the device.
+Each statistic has three properties ``name``, ``id`` and ``value``:
+
+* ``name``: A human readable string formatted by the scheme detailed below.
+* ``id``: An integer that represents only that statistic.
+* ``value``: A unsigned 64-bit integer that is the value of the statistic.
+
+The API consists of various ``rte_eth_xstats_*()`` functions, and allows an
+application to be flexible in how it retrieves statistics.
+
+
+Scheme for Human Readable Names
+_______________________________
 
 A naming scheme exists for the strings exposed to clients of the API. This is
 to allow scraping of the API for statistics of interest. The naming scheme uses
@@ -363,8 +359,8 @@ strings split by a single underscore ``_``. The scheme is 
as follows:
 * detail n
 * unit
 
-Examples of common statistics xstats strings, formatted to comply to the scheme
-proposed above:
+Examples of common statistics xstats strings, formatted to comply to the
+above scheme:
 
 * ``rx_bytes``
 * ``rx_crc_errors``
@@ -378,7 +374,7 @@ associated with the receive side of the NIC.  The second 
component ``packets``
 indicates that the unit of measure is packets.
 
 A more complicated example: ``tx_size_128_to_255_packets``. In this example,
-``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc are
+``tx`` indicates transmission, ``size``  is the first detail, ``128`` etc. are
 more details, and ``packets`` indicates that this is a packet counter.
 
 Some additions in the metadata scheme are as follows:
@@ -392,3 +388,139 @@ Some additions in the metadata scheme are as follows:
 An example where queue numbers are used is as follows: ``tx_q7_bytes`` which
 indicates this statistic applies to queue number 7, and represents the number
 of transmitted bytes on that queue.
+
+API Design
+__________
+
+The xstats API uses the ``name``, ``id``, and ``value`` to allow performant
+lookup of specific statistics. Performant lookup means two things;
+
+* No string comparisons with the ``name`` of the statistic in fast-path
+* Allow requesting of only the statistics of interest
+
+The API ensures these requirements are met by mapping the ``name`` of the
+statistic to a unique ``id``, which is used as a key for lookup in the 
fast-path.
+The API allows applications to request an array of ``id`` values, so that the
+PMD only performs the required calculations. Expected usage is that the
+application scans the ``name`` of each statistic, and caches the ``id``
+if it has an interest in that statistic. On the fast-path, the integer can be 
used
+to retrieve the actual ``value`` of the statistic that the ``id`` represents.
+
+API Functions
+_____________
+
+The API is built out of a small number of functions, which can be used to
+retrieve the number of statistics and the names, IDs and values of those
+statistics.
+
+* ``rte_eth_xstats_get_names()``: returns the names of the statistics. When 
given a
+  ``NULL`` parameter the function returns the number of statistics that are 
available.
+
+* ``rte_eth_xstats_get_id_by_name()``: Searches for the statistic ID that 
matches
+  ``xstat_name``. If found, the ``id`` integer is set.
+
+* ``rte_eth_xstats_get()``: Fills in an array of ``uint64_t`` values
+  with matching the provided ``ids`` array. If the ``ids`` array is NULL, it
+  returns all statistics that are available.
+
+
+Application Usage
+_________________
+
+Imagine an application that wants to view the dropped packet count. If no
+packets are dropped, the application does not read any other metrics for
+performance reasons. If packets are dropped, the application has a particular
+set of statistics that it requests. This "set" of statistics allows the app to
+decide what next steps to perform. The following code-snippets show how the
+xstats API can be used to achieve this goal.
+
+First step is to get all statistics names and list them:
+
+.. code-block:: c
+
+    struct rte_eth_xstat_name *xstats_names;
+    uint64_t *values;
+    int len, i;
+
+    /* Get number of stats */
+    len = rte_eth_xstats_get_names(port_id, NULL, NULL, 0);
+    if (len < 0) {
+        printf("Cannot get xstats count\n");
+        goto err;
+    }
+
+    xstats_names = malloc(sizeof(struct rte_eth_xstat_name) * len);
+    if (xstats_names == NULL) {
+        printf("Cannot allocate memory for xstat names\n");
+        goto err;
+    }
+
+    /* Retrieve xstats names, passing NULL for IDs to return all statistics */
+    if (len != rte_eth_xstats_get_names(port_id, xstats_names, NULL, len)) {
+        printf("Cannot get xstat names\n");
+        goto err;
+    }
+
+    values = malloc(sizeof(values) * len);
+    if (values == NULL) {
+        printf("Cannot allocate memory for xstats\n");
+        goto err;
+    }
+
+    /* Getting xstats values */
+    if (len != rte_eth_xstats_get(port_id, NULL, values, len)) {
+        printf("Cannot get xstat values\n");
+        goto err;
+    }
+
+    /* Print all xstats names and values */
+    for (i = 0; i < len; i++) {
+        printf("%s: %"PRIu64"\n", xstats_names[i].name, values[i]);
+    }
+
+The application has access to the names of all of the statistics that the PMD
+exposes. The application can decide which statistics are of interest, cache the
+ids of those statistics by looking up the name as follows:
+
+.. code-block:: c
+
+    uint64_t id;
+    uint64_t value;
+    const char *xstat_name = "rx_errors";
+
+    if(!rte_eth_xstats_get_id_by_name(port_id, xstat_name, &id)) {
+        rte_eth_xstats_get(port_id, &id, &value, 1);
+        printf("%s: %"PRIu64"\n", xstat_name, value);
+    }
+    else {
+        printf("Cannot find xstats with a given name\n");
+        goto err;
+    }
+
+The API provides flexibility to the application so that it can look up multiple
+statistics using an array containing multiple ``id`` numbers. This reduces the
+function call overhead of retrieving statistics, and makes lookup of multiple
+statistics simpler for the application.
+
+.. code-block:: c
+
+    #define APP_NUM_STATS 4
+    /* application cached these ids previously; see above */
+    uint64_t ids_array[APP_NUM_STATS] = {3,4,7,21};
+    uint64_t value_array[APP_NUM_STATS];
+
+    /* Getting multiple xstats values from array of IDs */
+    rte_eth_xstats_get(port_id, ids_array, value_array, APP_NUM_STATS);
+
+    uint32_t i;
+    for(i = 0; i < APP_NUM_STATS; i++) {
+        printf("%d: %"PRIu64"\n", ids_array[i], value_array[i]);
+    }
+
+
+This array lookup API for xstats allows the application create multiple
+"groups" of statistics, and look up the values of those IDs using a single API
+call. As an end result, the application is able to achieve its goal of
+monitoring a single statistic ("rx_errors" in this case), and if that shows
+packets being dropped, it can easily retrieve a "set" of statistics using the
+IDs array parameter to ``rte_eth_xstats_get`` function.
diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 4e1e6dc..0653cf7 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1454,12 +1454,19 @@ struct rte_eth_dev *
 
        RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
        dev = &rte_eth_devices[port_id];
+       if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+               count = (*dev->dev_ops->xstats_get_names_by_ids)(dev, NULL,
+                               NULL, 0);
+               if (count < 0)
+                       return count;
+       }
        if (dev->dev_ops->xstats_get_names != NULL) {
                count = (*dev->dev_ops->xstats_get_names)(dev, NULL, 0);
                if (count < 0)
                        return count;
        } else
                count = 0;
+
        count += RTE_NB_STATS;
        count += RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS) *
                 RTE_NB_RXQ_STATS;
@@ -1469,150 +1476,367 @@ struct rte_eth_dev *
 }
 
 int
-rte_eth_xstats_get_names(uint8_t port_id,
-       struct rte_eth_xstat_name *xstats_names,
-       unsigned size)
+rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+               uint64_t *id)
 {
-       struct rte_eth_dev *dev;
-       int cnt_used_entries;
-       int cnt_expected_entries;
-       int cnt_driver_entries;
-       uint32_t idx, id_queue;
-       uint16_t num_q;
+       int cnt_xstats, idx_xstat;
 
-       cnt_expected_entries = get_xstats_count(port_id);
-       if (xstats_names == NULL || cnt_expected_entries < 0 ||
-                       (int)size < cnt_expected_entries)
-               return cnt_expected_entries;
+       RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
 
-       /* port_id checked in get_xstats_count() */
-       dev = &rte_eth_devices[port_id];
-       cnt_used_entries = 0;
+       if (!id) {
+               RTE_PMD_DEBUG_TRACE("Error: id pointer is NULL\n");
+               return -1;
+       }
 
-       for (idx = 0; idx < RTE_NB_STATS; idx++) {
-               snprintf(xstats_names[cnt_used_entries].name,
-                       sizeof(xstats_names[0].name),
-                       "%s", rte_stats_strings[idx].name);
-               cnt_used_entries++;
+       if (!xstat_name) {
+               RTE_PMD_DEBUG_TRACE("Error: xstat_name pointer is NULL\n");
+               return -1;
        }
-       num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-       for (id_queue = 0; id_queue < num_q; id_queue++) {
-               for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+
+       /* Get count */
+       cnt_xstats = rte_eth_xstats_get_names(port_id, NULL, 0, NULL);
+       if (cnt_xstats  < 0) {
+               RTE_PMD_DEBUG_TRACE("Error: Cannot get count of xstats\n");
+               return -1;
+       }
+
+       /* Get id-name lookup table */
+       struct rte_eth_xstat_name xstats_names[cnt_xstats];
+
+       if (cnt_xstats != rte_eth_xstats_get_names(
+                       port_id, xstats_names, cnt_xstats, NULL)) {
+               RTE_PMD_DEBUG_TRACE("Error: Cannot get xstats lookup\n");
+               return -1;
+       }
+
+       for (idx_xstat = 0; idx_xstat < cnt_xstats; idx_xstat++) {
+               if (!strcmp(xstats_names[idx_xstat].name, xstat_name)) {
+                       *id = idx_xstat;
+                       return 0;
+               };
+       }
+
+       return -EINVAL;
+}
+
+int
+rte_eth_xstats_get_names_v1607(uint8_t port_id,
+       struct rte_eth_xstat_name *xstats_names,
+       unsigned int size)
+{
+       return rte_eth_xstats_get_names(port_id, xstats_names, size, NULL);
+}
+VERSION_SYMBOL(rte_eth_xstats_get_names, _v1607, 16.07);
+
+int
+rte_eth_xstats_get_names_v1705(uint8_t port_id,
+       struct rte_eth_xstat_name *xstats_names, unsigned int size,
+       uint64_t *ids)
+{
+       /* Get all xstats */
+       if (!ids) {
+               struct rte_eth_dev *dev;
+               int cnt_used_entries;
+               int cnt_expected_entries;
+               int cnt_driver_entries;
+               uint32_t idx, id_queue;
+               uint16_t num_q;
+
+               cnt_expected_entries = get_xstats_count(port_id);
+               if (xstats_names == NULL || cnt_expected_entries < 0 ||
+                               (int)size < cnt_expected_entries)
+                       return cnt_expected_entries;
+
+               /* port_id checked in get_xstats_count() */
+               dev = &rte_eth_devices[port_id];
+               cnt_used_entries = 0;
+
+               for (idx = 0; idx < RTE_NB_STATS; idx++) {
                        snprintf(xstats_names[cnt_used_entries].name,
                                sizeof(xstats_names[0].name),
-                               "rx_q%u%s",
-                               id_queue, rte_rxq_stats_strings[idx].name);
+                               "%s", rte_stats_strings[idx].name);
                        cnt_used_entries++;
                }
+               num_q = RTE_MIN(dev->data->nb_rx_queues,
+                               RTE_ETHDEV_QUEUE_STAT_CNTRS);
+               for (id_queue = 0; id_queue < num_q; id_queue++) {
+                       for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
+                               snprintf(xstats_names[cnt_used_entries].name,
+                                       sizeof(xstats_names[0].name),
+                                       "rx_q%u%s",
+                                       id_queue,
+                                       rte_rxq_stats_strings[idx].name);
+                               cnt_used_entries++;
+                       }
+
+               }
+               num_q = RTE_MIN(dev->data->nb_tx_queues,
+                               RTE_ETHDEV_QUEUE_STAT_CNTRS);
+               for (id_queue = 0; id_queue < num_q; id_queue++) {
+                       for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
+                               snprintf(xstats_names[cnt_used_entries].name,
+                                       sizeof(xstats_names[0].name),
+                                       "tx_q%u%s",
+                                       id_queue,
+                                       rte_txq_stats_strings[idx].name);
+                               cnt_used_entries++;
+                       }
+               }
+
+               if (dev->dev_ops->xstats_get_names_by_ids != NULL) {
+                       /* If there are any driver-specific xstats, append them
+                        * to end of list.
+                        */
+                       cnt_driver_entries =
+                               (*dev->dev_ops->xstats_get_names_by_ids)(
+                               dev,
+                               xstats_names + cnt_used_entries,
+                               NULL,
+                               size - cnt_used_entries);
+                       if (cnt_driver_entries < 0)
+                               return cnt_driver_entries;
+                       cnt_used_entries += cnt_driver_entries;
+
+               } else if (dev->dev_ops->xstats_get_names != NULL) {
+                       /* If there are any driver-specific xstats, append them
+                        * to end of list.
+                        */
+                       cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
+                               dev,
+                               xstats_names + cnt_used_entries,
+                               size - cnt_used_entries);
+                       if (cnt_driver_entries < 0)
+                               return cnt_driver_entries;
+                       cnt_used_entries += cnt_driver_entries;
+               }
 
+               return cnt_used_entries;
        }
-       num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-       for (id_queue = 0; id_queue < num_q; id_queue++) {
-               for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
-                       snprintf(xstats_names[cnt_used_entries].name,
-                               sizeof(xstats_names[0].name),
-                               "tx_q%u%s",
-                               id_queue, rte_txq_stats_strings[idx].name);
-                       cnt_used_entries++;
+       /* Get only xstats given by IDS */
+       else {
+               uint16_t len, i;
+               struct rte_eth_xstat_name *xstats_names_copy;
+
+               len = rte_eth_xstats_get_names_v1705(port_id, NULL, 0, NULL);
+
+               xstats_names_copy =
+                               malloc(sizeof(struct rte_eth_xstat_name) * len);
+               if (!xstats_names_copy) {
+                       RTE_PMD_DEBUG_TRACE(
+                            "ERROR: can't allocate memory for values_copy\n");
+                       free(xstats_names_copy);
+                       return -1;
                }
+
+               rte_eth_xstats_get_names_v1705(port_id, xstats_names_copy,
+                               len, NULL);
+
+               for (i = 0; i < size; i++) {
+                       if (ids[i] >= len) {
+                               RTE_PMD_DEBUG_TRACE(
+                                       "ERROR: id value isn't valid\n");
+                               return -1;
+                       }
+                       strcpy(xstats_names[i].name,
+                                       xstats_names_copy[ids[i]].name);
+               }
+               free(xstats_names_copy);
+               return size;
        }
+}
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get_names, _v1705, 17.05);
 
-       if (dev->dev_ops->xstats_get_names != NULL) {
-               /* If there are any driver-specific xstats, append them
-                * to end of list.
-                */
-               cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
-                       dev,
-                       xstats_names + cnt_used_entries,
-                       size - cnt_used_entries);
-               if (cnt_driver_entries < 0)
-                       return cnt_driver_entries;
-               cnt_used_entries += cnt_driver_entries;
+MAP_STATIC_SYMBOL(int
+               rte_eth_xstats_get_names(uint8_t port_id,
+                       struct rte_eth_xstat_name *xstats_names,
+                       unsigned int size,
+                       uint64_t *ids), rte_eth_xstats_get_names_v1705);
+
+/* retrieve ethdev extended statistics */
+int
+rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+       unsigned int n)
+{
+       uint64_t *values_copy;
+       uint16_t size, i;
+
+       values_copy = malloc(sizeof(values_copy) * n);
+       if (!values_copy) {
+               RTE_PMD_DEBUG_TRACE(
+                               "ERROR: Cannot allocate memory for xstats\n");
+               return -1;
        }
+       size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-       return cnt_used_entries;
+       for (i = 0; i < n; i++) {
+               xstats[i].id = i;
+               xstats[i].value = values_copy[i];
+       }
+       free(values_copy);
+       return size;
 }
+VERSION_SYMBOL(rte_eth_xstats_get, _v22, 2.2);
 
 /* retrieve ethdev extended statistics */
 int
-rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-       unsigned n)
+rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+       unsigned int n)
 {
-       struct rte_eth_stats eth_stats;
-       struct rte_eth_dev *dev;
-       unsigned count = 0, i, q;
-       signed xcount = 0;
-       uint64_t val, *stats_ptr;
-       uint16_t nb_rxqs, nb_txqs;
+       /* If need all xstats */
+       if (!ids) {
+               struct rte_eth_stats eth_stats;
+               struct rte_eth_dev *dev;
+               unsigned int count = 0, i, q;
+               signed int xcount = 0;
+               uint64_t val, *stats_ptr;
+               uint16_t nb_rxqs, nb_txqs;
 
-       RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
+               RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+               dev = &rte_eth_devices[port_id];
 
-       dev = &rte_eth_devices[port_id];
+               nb_rxqs = RTE_MIN(dev->data->nb_rx_queues,
+                               RTE_ETHDEV_QUEUE_STAT_CNTRS);
+               nb_txqs = RTE_MIN(dev->data->nb_tx_queues,
+                               RTE_ETHDEV_QUEUE_STAT_CNTRS);
 
-       nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
-       nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+               /* Return generic statistics */
+               count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
+                       (nb_txqs * RTE_NB_TXQ_STATS);
 
-       /* Return generic statistics */
-       count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
-               (nb_txqs * RTE_NB_TXQ_STATS);
 
-       /* implemented by the driver */
-       if (dev->dev_ops->xstats_get != NULL) {
-               /* Retrieve the xstats from the driver at the end of the
-                * xstats struct.
-                */
-               xcount = (*dev->dev_ops->xstats_get)(dev,
-                                    xstats ? xstats + count : NULL,
-                                    (n > count) ? n - count : 0);
+               /* implemented by the driver */
+               if (dev->dev_ops->xstats_get_by_ids != NULL) {
+                       /* Retrieve the xstats from the driver at the end of the
+                        * xstats struct. Retrieve all xstats.
+                        */
+                       xcount = (*dev->dev_ops->xstats_get_by_ids)(dev,
+                                       NULL,
+                                       values ? values + count : NULL,
+                                       (n > count) ? n - count : 0);
+
+                       if (xcount < 0)
+                               return xcount;
+               /* implemented by the driver */
+               } else if (dev->dev_ops->xstats_get != NULL) {
+                       /* Retrieve the xstats from the driver at the end of the
+                        * xstats struct. Retrieve all xstats.
+                        * Compatibility for PMD without xstats_get_by_ids
+                        */
+                       unsigned int size = (n > count) ? n - count : 1;
+                       struct rte_eth_xstat xstats[size];
 
-               if (xcount < 0)
-                       return xcount;
-       }
+                       xcount = (*dev->dev_ops->xstats_get)(dev,
+                                       values ? xstats : NULL, size);
 
-       if (n < count + xcount || xstats == NULL)
-               return count + xcount;
+                       if (xcount < 0)
+                               return xcount;
+
+                       if (values != NULL)
+                               for (i = 0 ; i < (unsigned int)xcount; i++)
+                                       values[i + count] = xstats[i].value;
+               }
 
-       /* now fill the xstats structure */
-       count = 0;
-       rte_eth_stats_get(port_id, &eth_stats);
+               if (n < count + xcount || values == NULL)
+                       return count + xcount;
 
-       /* global stats */
-       for (i = 0; i < RTE_NB_STATS; i++) {
-               stats_ptr = RTE_PTR_ADD(&eth_stats,
-                                       rte_stats_strings[i].offset);
-               val = *stats_ptr;
-               xstats[count++].value = val;
-       }
+               /* now fill the xstats structure */
+               count = 0;
+               rte_eth_stats_get(port_id, &eth_stats);
 
-       /* per-rxq stats */
-       for (q = 0; q < nb_rxqs; q++) {
-               for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+               /* global stats */
+               for (i = 0; i < RTE_NB_STATS; i++) {
                        stats_ptr = RTE_PTR_ADD(&eth_stats,
-                                       rte_rxq_stats_strings[i].offset +
-                                       q * sizeof(uint64_t));
+                                               rte_stats_strings[i].offset);
                        val = *stats_ptr;
-                       xstats[count++].value = val;
+                       values[count++] = val;
                }
+
+               /* per-rxq stats */
+               for (q = 0; q < nb_rxqs; q++) {
+                       for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
+                               stats_ptr = RTE_PTR_ADD(&eth_stats,
+                                           rte_rxq_stats_strings[i].offset +
+                                           q * sizeof(uint64_t));
+                               val = *stats_ptr;
+                               values[count++] = val;
+                       }
+               }
+
+               /* per-txq stats */
+               for (q = 0; q < nb_txqs; q++) {
+                       for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
+                               stats_ptr = RTE_PTR_ADD(&eth_stats,
+                                           rte_txq_stats_strings[i].offset +
+                                           q * sizeof(uint64_t));
+                               val = *stats_ptr;
+                               values[count++] = val;
+                       }
+               }
+
+               return count + xcount;
        }
+       /* Need only xstats given by IDS array */
+       else {
+               uint16_t i, size;
+               uint64_t *values_copy;
 
-       /* per-txq stats */
-       for (q = 0; q < nb_txqs; q++) {
-               for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
-                       stats_ptr = RTE_PTR_ADD(&eth_stats,
-                                       rte_txq_stats_strings[i].offset +
-                                       q * sizeof(uint64_t));
-                       val = *stats_ptr;
-                       xstats[count++].value = val;
+               size = rte_eth_xstats_get_v1705(port_id, NULL, NULL, 0);
+
+               values_copy = malloc(sizeof(values_copy) * size);
+               if (!values_copy) {
+                       RTE_PMD_DEBUG_TRACE(
+                           "ERROR: can't allocate memory for values_copy\n");
+                       return -1;
+               }
+
+               rte_eth_xstats_get_v1705(port_id, NULL, values_copy, size);
+
+               for (i = 0; i < n; i++) {
+                       if (ids[i] >= size) {
+                               RTE_PMD_DEBUG_TRACE(
+                                       "ERROR: id value isn't valid\n");
+                               return -1;
+                       }
+                       values[i] = values_copy[ids[i]];
                }
+               free(values_copy);
+               return n;
+       }
+}
+BIND_DEFAULT_SYMBOL(rte_eth_xstats_get, _v1705, 17.05);
+
+MAP_STATIC_SYMBOL(int
+               rte_eth_xstats_get(uint8_t port_id, uint64_t *ids,
+               uint64_t *values, unsigned int n), rte_eth_xstats_get_v1705);
+
+__rte_deprecated int
+rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+       unsigned int n)
+{
+       uint64_t *values_copy;
+       uint16_t size, i;
+
+       values_copy = malloc(sizeof(values_copy) * n);
+       if (!values_copy) {
+               RTE_PMD_DEBUG_TRACE(
+                               "ERROR: Cannot allocate memory for xstats\n");
+               return -1;
        }
+       size = rte_eth_xstats_get(port_id, 0, values_copy, n);
 
-       for (i = 0; i < count; i++)
+       for (i = 0; i < n; i++) {
                xstats[i].id = i;
-       /* add an offset to driver-specific stats */
-       for ( ; i < count + xcount; i++)
-               xstats[i].id += count;
+               xstats[i].value = values_copy[i];
+       }
+       free(values_copy);
+       return size;
+}
 
-       return count + xcount;
+__rte_deprecated int
+rte_eth_xstats_get_names_all(uint8_t port_id,
+               struct rte_eth_xstat_name *xstats_names, unsigned int n)
+{
+       return rte_eth_xstats_get_names(port_id, xstats_names, n, NULL);
 }
 
 /* reset ethdev extended statistics */
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index d072538..0ef9d20 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -186,6 +186,7 @@
 #include "rte_ether.h"
 #include "rte_eth_ctrl.h"
 #include "rte_dev_info.h"
+#include "rte_compat.h"
 
 struct rte_mbuf;
 
@@ -1118,6 +1119,10 @@ typedef int (*eth_xstats_get_t)(struct rte_eth_dev *dev,
        struct rte_eth_xstat *stats, unsigned n);
 /**< @internal Get extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_by_ids_t)(struct rte_eth_dev *dev,
+               uint64_t *ids, uint64_t *values, unsigned int n);
+/**< @internal Get extended stats of an Ethernet device. */
+
 typedef void (*eth_xstats_reset_t)(struct rte_eth_dev *dev);
 /**< @internal Reset extended stats of an Ethernet device. */
 
@@ -1125,6 +1130,17 @@ typedef int (*eth_xstats_get_names_t)(struct rte_eth_dev 
*dev,
        struct rte_eth_xstat_name *xstats_names, unsigned size);
 /**< @internal Get names of extended stats of an Ethernet device. */
 
+typedef int (*eth_xstats_get_names_by_ids_t)(struct rte_eth_dev *dev,
+       struct rte_eth_xstat_name *xstats_names, uint64_t *ids,
+       unsigned int size);
+/**< @internal Get names of extended stats of an Ethernet device. */
+
+typedef int (*eth_xstats_get_by_name_t)(struct rte_eth_dev *dev,
+               struct rte_eth_xstat_name *xstats_names,
+               struct rte_eth_xstat *xstat,
+               const char *name);
+/**< @internal Get xstat specified by name of an Ethernet device. */
+
 typedef int (*eth_queue_stats_mapping_set_t)(struct rte_eth_dev *dev,
                                             uint16_t queue_id,
                                             uint8_t stat_idx,
@@ -1466,8 +1482,8 @@ struct eth_dev_ops {
        eth_stats_reset_t          stats_reset;   /**< Reset generic device 
statistics. */
        eth_xstats_get_t           xstats_get;    /**< Get extended device 
statistics. */
        eth_xstats_reset_t         xstats_reset;  /**< Reset extended device 
statistics. */
-       eth_xstats_get_names_t     xstats_get_names;
-       /**< Get names of extended statistics. */
+       eth_xstats_get_names_t     xstats_get_names;
+       /**< Get names of extended device statistics. */
        eth_queue_stats_mapping_set_t queue_stats_mapping_set;
        /**< Configure per queue stat counter mapping. */
 
@@ -1563,6 +1579,12 @@ struct eth_dev_ops {
        eth_timesync_adjust_time   timesync_adjust_time; /** Adjust the device 
clock. */
        eth_timesync_read_time     timesync_read_time; /** Get the device clock 
time. */
        eth_timesync_write_time    timesync_write_time; /** Set the device 
clock time. */
+       eth_xstats_get_by_ids_t    xstats_get_by_ids;
+       /**< Get extended device statistics by ID. */
+       eth_xstats_get_names_by_ids_t xstats_get_names_by_ids;
+       /**< Get name of extended device statistics by ID. */
+       eth_xstats_get_by_name_t   xstats_get_by_name;
+       /**< Get extended device statistics by name. */
 };
 
 /**
@@ -2324,8 +2346,55 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t 
tx_queue_id,
  */
 void rte_eth_stats_reset(uint8_t port_id);
 
+
 /**
- * Retrieve names of extended statistics of an Ethernet device.
+* Gets the ID of a statistic from its name.
+*
+* Note this function searches for the statistics using string compares, and
+* as such should not be used on the fast-path. For fast-path retrieval of
+* specific statistics, store the ID as provided in *id* from this function,
+* and pass the ID to rte_eth_xstats_get()
+*
+* @param port_id The port to look up statistics from
+* @param xstat_name The name of the statistic to return
+* @param[out] id A pointer to an app-supplied uint64_t which should be
+*                set to the ID of the stat if the stat exists.
+* @return
+*    0 on success
+*    -ENODEV for invalid port_id,
+*    -EINVAL if the xstat_name doesn't exist in port_id
+*/
+int rte_eth_xstats_get_id_by_name(uint8_t port_id, const char *xstat_name,
+               uint64_t *id);
+
+/**
+ * Retrieve all extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+__rte_deprecated
+int rte_eth_xstats_get_all(uint8_t port_id, struct rte_eth_xstat *xstats,
+       unsigned int n);
+
+/**
+ * Retrieve names of all extended statistics of an Ethernet device.
  *
  * @param port_id
  *   The port identifier of the Ethernet device.
@@ -2333,7 +2402,7 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t 
tx_queue_id,
  *   An rte_eth_xstat_name array of at least *size* elements to
  *   be filled. If set to NULL, the function returns the required number
  *   of elements.
- * @param size
+ * @param n
  *   The size of the xstats_names array (number of elements).
  * @return
  *   - A positive value lower or equal to size: success. The return value
@@ -2344,9 +2413,8 @@ int rte_eth_tx_queue_setup(uint8_t port_id, uint16_t 
tx_queue_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get_names(uint8_t port_id,
-               struct rte_eth_xstat_name *xstats_names,
-               unsigned size);
+__rte_deprecated int rte_eth_xstats_get_names_all(uint8_t port_id,
+               struct rte_eth_xstat_name *xstats_names, unsigned int n);
 
 /**
  * Retrieve extended statistics of an Ethernet device.
@@ -2370,8 +2438,92 @@ int rte_eth_xstats_get_names(uint8_t port_id,
  *     shall not be used by the caller.
  *   - A negative value on error (invalid port id).
  */
-int rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
-               unsigned n);
+int rte_eth_xstats_get_v22(uint8_t port_id, struct rte_eth_xstat *xstats,
+       unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param ids
+ *   A pointer to an ids array passed by application. This tells wich
+ *   statistics values function should retrieve. This parameter
+ *   can be set to NULL if n is 0. In this case function will retrieve
+ *   all avalible statistics.
+ * @param values
+ *   A pointer to a table to be filled with device statistics values.
+ * @param n
+ *   The size of the ids array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_v1705(uint8_t port_id, uint64_t *ids, uint64_t *values,
+       unsigned int n);
+
+int rte_eth_xstats_get(uint8_t port_id, uint64_t *ids, uint64_t *values,
+       unsigned int n);
+
+/**
+ * Retrieve extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   A pointer to a table of structure of type *rte_eth_xstat*
+ *   to be filled with device statistics ids and values: id is the
+ *   index of the name string in xstats_names (see rte_eth_xstats_get_names()),
+ *   and value is the statistic counter.
+ *   This parameter can be set to NULL if n is 0.
+ * @param n
+ *   The size of the xstats array (number of elements).
+ * @return
+ *   - A positive value lower or equal to n: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than n: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1607(uint8_t port_id,
+               struct rte_eth_xstat_name *xstats_names, unsigned int n);
+
+/**
+ * Retrieve names of extended statistics of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param xstats_names
+ *   An rte_eth_xstat_name array of at least *size* elements to
+ *   be filled. If set to NULL, the function returns the required number
+ *   of elements.
+ * @param ids
+ *   IDs array given by app to retrieve specific statistics
+ * @param size
+ *   The size of the xstats_names array (number of elements).
+ * @return
+ *   - A positive value lower or equal to size: success. The return value
+ *     is the number of entries filled in the stats table.
+ *   - A positive value higher than size: error, the given statistics table
+ *     is too small. The return value corresponds to the size that should
+ *     be given to succeed. The entries in the table are not valid and
+ *     shall not be used by the caller.
+ *   - A negative value on error (invalid port id).
+ */
+int rte_eth_xstats_get_names_v1705(uint8_t port_id,
+       struct rte_eth_xstat_name *xstats_names, unsigned int size,
+       uint64_t *ids);
+
+int rte_eth_xstats_get_names(uint8_t port_id,
+       struct rte_eth_xstat_name *xstats_names, unsigned int size,
+       uint64_t *ids);
 
 /**
  * Reset extended statistics of an Ethernet device.
diff --git a/lib/librte_ether/rte_ether_version.map 
b/lib/librte_ether/rte_ether_version.map
index 0ea3856..f4d0136 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -159,5 +159,10 @@ DPDK_17.05 {
        global:
 
        rte_eth_find_next;
+       rte_eth_xstats_get_names;
+       rte_eth_xstats_get;
+       rte_eth_xstats_get_all;
+       rte_eth_xstats_get_names_all;
+       rte_eth_xstats_get_id_by_name;
 
 } DPDK_17.02;
-- 
1.9.1

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