[dpdk-dev] [RFC 4/6] ethdev: add callback support for process-info

[Ciara Power]

From: Bruce Richardson <bruce.richard...@intel.com>

The ethdev library now registers commands with process_info, and
implements the callback functions. These commands allow the list of
ethdev ports and the stats for a port to be queried.

Signed-off-by: Bruce Richardson <bruce.richard...@intel.com>
Signed-off-by: Ciara Power <ciara.po...@intel.com>
---
 lib/librte_ethdev/Makefile     |  2 +-
 lib/librte_ethdev/rte_ethdev.c | 73 ++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/lib/librte_ethdev/Makefile b/lib/librte_ethdev/Makefile
index b627e4e23..f586f83de 100644
--- a/lib/librte_ethdev/Makefile
+++ b/lib/librte_ethdev/Makefile
@@ -12,7 +12,7 @@ CFLAGS += -DALLOW_EXPERIMENTAL_API
 CFLAGS += -O3
 CFLAGS += $(WERROR_FLAGS)
 LDLIBS += -lrte_net -lrte_eal -lrte_mempool -lrte_ring
-LDLIBS += -lrte_mbuf -lrte_kvargs -lrte_meter
+LDLIBS += -lrte_mbuf -lrte_kvargs -lrte_meter -lrte_process_info
 
 EXPORT_MAP := rte_ethdev_version.map
 
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 6e9cb243e..b0b5ceec5 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -38,6 +38,7 @@
 #include <rte_kvargs.h>
 #include <rte_class.h>
 #include <rte_ether.h>
+#include <rte_process_info.h>
 
 #include "rte_ethdev.h"
 #include "rte_ethdev_driver.h"
@@ -5190,9 +5191,81 @@ rte_eth_devargs_parse(const char *dargs, struct 
rte_eth_devargs *eth_da)
        return result;
 }
 
+static int
+handle_port_list(const char *cmd __rte_unused,
+               const char *params __rte_unused,
+               char *buffer, int buf_len)
+{
+       int used = 0;
+       int port_id;
+
+       used = strlcpy(buffer, "[", buf_len);
+       RTE_ETH_FOREACH_DEV(port_id)
+               used += snprintf(buffer + used, buf_len - used, "%d,", port_id);
+       buffer[used - 1] = ']';
+       return used;
+}
+
+static int
+handle_port_stats(const char *cmd __rte_unused,
+               const char *params,
+               char *buffer, int buf_len)
+{
+       struct rte_eth_xstat *eth_xstats;
+       struct rte_eth_xstat_name *xstat_names;
+       int port_id, num_xstats;
+       int i, ret;
+       int used = 0;
+
+       if (params == NULL || strlen(params) == 0 || !isdigit(*params))
+               return -1;
+
+       port_id = atoi(params);
+       if (!rte_eth_dev_is_valid_port(port_id))
+               return -1;
+
+       used = strlcpy(buffer, "{", buf_len);
+
+       num_xstats = rte_eth_xstats_get(port_id, NULL, 0);
+       if (num_xstats < 0)
+               return -1;
+
+       /* use one malloc for both names and stats */
+       eth_xstats = malloc((sizeof(struct rte_eth_xstat) +
+                       sizeof(struct rte_eth_xstat_name)) * num_xstats);
+       if (eth_xstats == NULL)
+               return -1;
+       xstat_names = (void *)&eth_xstats[num_xstats];
+
+       ret = rte_eth_xstats_get_names(port_id, xstat_names, num_xstats);
+       if (ret < 0 || ret > num_xstats) {
+               free(eth_xstats);
+               return -1;
+       }
+
+       ret = rte_eth_xstats_get(port_id, eth_xstats, num_xstats);
+       if (ret < 0 || ret > num_xstats) {
+               free(eth_xstats);
+               return -1;
+       }
+
+       for (i = 0; i < num_xstats; i++) {
+               ret = snprintf(buffer + used, buf_len - used, 
"\"%s\":%"PRIu64",",
+                               xstat_names[i].name, eth_xstats[i].value);
+               if (ret + used >= buf_len)
+                       break;
+               used += ret;
+       }
+
+       buffer[used - 1] = '}';
+       return used;
+}
+
 RTE_INIT(ethdev_init_log)
 {
        rte_eth_dev_logtype = rte_log_register("lib.ethdev");
        if (rte_eth_dev_logtype >= 0)
                rte_log_set_level(rte_eth_dev_logtype, RTE_LOG_INFO);
+       rte_process_info_register("/ethdev:list", handle_port_list);
+       rte_process_info_register("/ethdev:stats", handle_port_stats);
 }
-- 
2.17.1