dpdk: Add debug appctl to get malloc statistics.

New appctl 'dpdk/get-malloc-stats' implemented to get result of
'rte_malloc_dump_stats()' function.

Could be used for debugging.

Signed-off-by: Eli Britstein <elibr@nvidia.com>
Reviewed-by: Salem Sol <salems@nvidia.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

NEWS

@@ -16,6 +16,7 @@ Post-v2.15.0
    - DPDK:
      * OVS validated with DPDK 20.11.1. It is recommended to use this version
        until further releases.
+     * New debug appctl command 'dpdk/get-malloc-stats'.
    - ovsdb-tool:
      * New option '--election-timer' to the 'create-cluster' command to set the
        leader election timer during cluster creation.

lib/dpdk-unixctl.man

@@ -10,5 +10,7 @@ list of words separated by spaces: a word can be either a logging \fBlevel\fR
 \fBnotice\fR, \fBinfo\fR or \fBdebug\fR) or a \fBpattern\fR matching DPDK
 components (see \fBdpdk/log-list\fR command on \fBovs\-appctl\fR(8)) separated
 by a colon from the logging \fBlevel\fR to apply.
+.IP "\fBdpdk/get-malloc-stats\fR"
+Prints the heap information statistics about DPDK malloc.
 .RE
 .

lib/dpdk.c

@@ -25,6 +25,7 @@
 #include <rte_cpuflags.h>
 #include <rte_errno.h>
 #include <rte_log.h>
+#include <rte_malloc.h>
 #include <rte_memzone.h>
 #include <rte_version.h>
 
@@ -356,6 +357,12 @@ dpdk_unixctl_log_set(struct unixctl_conn *conn, int argc, const char *argv[],
     unixctl_command_reply(conn, NULL);
 }
 
+static void
+malloc_dump_stats_wrapper(FILE *stream)
+{
+    rte_malloc_dump_stats(stream, NULL);
+}
+
 static bool
 dpdk_init__(const struct smap *ovs_other_config)
 {
@@ -525,6 +532,9 @@ dpdk_init__(const struct smap *ovs_other_config)
                              dpdk_unixctl_mem_stream, rte_log_dump);
     unixctl_command_register("dpdk/log-set", "{level | pattern:level}", 0,
                              INT_MAX, dpdk_unixctl_log_set, NULL);
+    unixctl_command_register("dpdk/get-malloc-stats", "", 0, 0,
+                             dpdk_unixctl_mem_stream,
+                             malloc_dump_stats_wrapper);
 
     /* We are called from the main thread here */
     RTE_PER_LCORE(_lcore_id) = NON_PMD_CORE_ID;