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LU-10452 lnet: cleanup YAML output
[fs/lustre-release.git] / lnet / utils / lnetconfig / liblnetconfig.c
index 885ef06..dce0795 100644 (file)
@@ -18,7 +18,7 @@
  *
  * LGPL HEADER END
  *
- * Copyright (c) 2014, 2016, Intel Corporation.
+ * Copyright (c) 2014, 2017, Intel Corporation.
  *
  * Author:
  *   Amir Shehata <amir.shehata@intel.com>
 #include <linux/lnet/lnetctl.h>
 #include "liblnd.h"
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <ifaddrs.h>
 #include "liblnetconfig.h"
-#include "cyaml.h"
 
 #define CONFIG_CMD             "configure"
 #define UNCONFIG_CMD           "unconfigure"
 #define DEL_CMD                        "del"
 #define SHOW_CMD               "show"
 #define DBG_CMD                        "dbg"
+#define MANAGE_CMD              "manage"
+
+#define modparam_path "/sys/module/lnet/parameters/"
+#define gni_nid_path "/proc/cray_xt/"
+
+const char *gmsg_stat_names[] = {"sent_stats", "received_stats",
+                                "dropped_stats"};
 
 /*
  * lustre_lnet_ip_range_descr
@@ -77,6 +85,62 @@ struct lustre_lnet_ip2nets {
        struct list_head ip2nets_ip_ranges;
 };
 
+int open_sysfs_file(const char *path, const char *attr, const int mode)
+{
+       int fd;
+       char filename[LNET_MAX_STR_LEN];
+
+       if (strlen(path) + strlen(attr) >= LNET_MAX_STR_LEN)
+               return -1;
+
+       snprintf(filename, sizeof(filename), "%s%s",
+                path, attr);
+
+       fd = open(filename, mode);
+
+       return fd;
+}
+
+static int read_sysfs_file(const char *path, const char *attr,
+                          void *val, const size_t size, const int nelem)
+{
+       int fd;
+       int rc = LUSTRE_CFG_RC_GENERIC_ERR;
+
+       fd = open_sysfs_file(path, attr, O_RDONLY);
+       if (fd == -1)
+               return LUSTRE_CFG_RC_NO_MATCH;
+
+       if (read(fd, val, size * nelem) == -1)
+               goto close_fd;
+
+       rc = LUSTRE_CFG_RC_NO_ERR;
+
+close_fd:
+       close(fd);
+       return rc;
+}
+
+static int write_sysfs_file(const char *path, const char *attr,
+                           void *val, const size_t size, const int nelem)
+{
+       int fd;
+       int rc = LUSTRE_CFG_RC_GENERIC_ERR;
+
+       fd = open_sysfs_file(path, attr, O_WRONLY | O_TRUNC);
+       if (fd == -1)
+               return LUSTRE_CFG_RC_NO_MATCH;
+
+       if (write(fd, val, size * nelem) == -1)
+               goto close_fd;
+
+       rc = LUSTRE_CFG_RC_NO_ERR;
+
+close_fd:
+       close(fd);
+       return rc;
+}
+
 /*
  * free_intf_descr
  *     frees the memory allocated for an intf descriptor.
@@ -176,6 +240,7 @@ int lustre_lnet_add_intf_descr(struct list_head *list, char *intf, int len)
 void lustre_lnet_init_nw_descr(struct lnet_dlc_network_descr *nw_descr)
 {
        if (nw_descr != NULL) {
+               nw_descr->nw_id = 0;
                INIT_LIST_HEAD(&nw_descr->network_on_rule);
                INIT_LIST_HEAD(&nw_descr->nw_intflist);
        }
@@ -332,8 +397,7 @@ failed:
 
 int lustre_lnet_config_lib_init(void)
 {
-       return register_ioc_dev(LNET_DEV_ID, LNET_DEV_PATH,
-                               LNET_DEV_MAJOR, LNET_DEV_MINOR);
+       return register_ioc_dev(LNET_DEV_ID, LNET_DEV_PATH);
 }
 
 void lustre_lnet_config_lib_uninit(void)
@@ -426,6 +490,198 @@ static int dispatch_peer_ni_cmd(lnet_nid_t pnid, lnet_nid_t nid, __u32 cmd,
        return rc;
 }
 
+static int infra_ping_nid(char *ping_nids, char *oper, int param, int ioc_call,
+                         int seq_no, struct cYAML **show_rc,
+                         struct cYAML **err_rc)
+{
+       void *data = NULL;
+       struct lnet_ioctl_ping_data ping;
+       struct cYAML *root = NULL, *ping_node = NULL, *item = NULL,
+                    *first_seq = NULL, *tmp = NULL, *peer_ni = NULL;
+       struct lnet_process_id id;
+       char err_str[LNET_MAX_STR_LEN] = {0};
+       char *sep, *token, *end;
+       char buf[6];
+       size_t len;
+       int rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+       int i;
+       bool flag = false;
+
+       len = (sizeof(struct lnet_process_id) * LNET_INTERFACES_MAX_DEFAULT);
+
+       data = calloc(1, len);
+       if (data == NULL)
+               goto out;
+
+       /* create struct cYAML root object */
+       root = cYAML_create_object(NULL, NULL);
+       if (root == NULL)
+               goto out;
+
+       ping_node = cYAML_create_seq(root, oper);
+       if (ping_node == NULL)
+               goto out;
+
+       /* tokenise each nid in string ping_nids */
+       token = strtok(ping_nids, ",");
+
+       do {
+               item = cYAML_create_seq_item(ping_node);
+               if (item == NULL)
+                       goto out;
+
+               if (first_seq == NULL)
+                       first_seq = item;
+
+               /* check if '-' is a part of NID, token */
+               sep = strchr(token, '-');
+               if (sep == NULL) {
+                       id.pid = LNET_PID_ANY;
+                       /* if no net is specified, libcfs_str2nid() will assume tcp */
+                       id.nid = libcfs_str2nid(token);
+                       if (id.nid == LNET_NID_ANY) {
+                               snprintf(err_str, sizeof(err_str),
+                                        "\"cannot parse NID '%s'\"",
+                                        token);
+                               rc = LUSTRE_CFG_RC_BAD_PARAM;
+                               cYAML_build_error(rc, seq_no, MANAGE_CMD,
+                                                 oper, err_str, err_rc);
+                               continue;
+                       }
+               } else {
+                       if (token[0] == 'u' || token[0] == 'U')
+                               id.pid = (strtoul(&token[1], &end, 0) |
+                                         (LNET_PID_USERFLAG));
+                       else
+                               id.pid = strtoul(token, &end, 0);
+
+                       /* assuming '-' is part of hostname */
+                       if (end != sep) {
+                               id.pid = LNET_PID_ANY;
+                               id.nid = libcfs_str2nid(token);
+                               if (id.nid == LNET_NID_ANY) {
+                                       snprintf(err_str, sizeof(err_str),
+                                                "\"cannot parse NID '%s'\"",
+                                                token);
+                                       rc = LUSTRE_CFG_RC_BAD_PARAM;
+                                       cYAML_build_error(rc, seq_no, MANAGE_CMD,
+                                                         oper, err_str,
+                                                         err_rc);
+                                       continue;
+                               }
+                       } else {
+                               id.nid = libcfs_str2nid(sep + 1);
+                               if (id.nid == LNET_NID_ANY) {
+                                       snprintf(err_str, sizeof(err_str),
+                                                "\"cannot parse NID '%s'\"",
+                                                token);
+                                       rc = LUSTRE_CFG_RC_BAD_PARAM;
+                                       cYAML_build_error(rc, seq_no, MANAGE_CMD,
+                                                         oper, err_str,
+                                                         err_rc);
+                                       continue;
+                               }
+                       }
+               }
+               LIBCFS_IOC_INIT_V2(ping, ping_hdr);
+               ping.ping_hdr.ioc_len = sizeof(ping);
+               ping.ping_id          = id;
+               ping.op_param         = param;
+               ping.ping_count       = LNET_INTERFACES_MAX_DEFAULT;
+               ping.ping_buf         = data;
+
+               rc = l_ioctl(LNET_DEV_ID, ioc_call, &ping);
+               if (rc != 0) {
+                       snprintf(err_str,
+                                sizeof(err_str), "failed to %s %s: %s\n", oper,
+                                id.pid == LNET_PID_ANY ?
+                                libcfs_nid2str(id.nid) :
+                                libcfs_id2str(id), strerror(errno));
+                       rc = LUSTRE_CFG_RC_BAD_PARAM;
+                       cYAML_build_error(rc, seq_no, MANAGE_CMD,
+                                         oper, err_str, err_rc);
+                       continue;
+               }
+
+               if (cYAML_create_string(item, "primary nid",
+                                       libcfs_nid2str(ping.ping_id.nid)) == NULL)
+                       goto out;
+
+               if (cYAML_create_string(item, "Multi-Rail", ping.mr_info ?
+                                       "True" : "False") == NULL)
+                       goto out;
+
+               tmp = cYAML_create_seq(item, "peer ni");
+               if (tmp == NULL)
+                       goto out;
+
+               for (i = 0; i < ping.ping_count; i++) {
+                       if (!strcmp(libcfs_nid2str(ping.ping_buf[i].nid),
+                                   "0@lo"))
+                               continue;
+                       peer_ni = cYAML_create_seq_item(tmp);
+                       if (peer_ni == NULL)
+                               goto out;
+                       memset(buf, 0, sizeof buf);
+                       snprintf(buf, sizeof buf, "nid");
+                       if (cYAML_create_string(peer_ni, buf,
+                                               libcfs_nid2str(ping.ping_buf[i].nid)) == NULL)
+                               goto out;
+               }
+
+               flag = true;
+
+       } while ((token = strtok(NULL, ",")) != NULL);
+
+       if (flag)
+               rc = LUSTRE_CFG_RC_NO_ERR;
+
+out:
+       if (data)
+               free(data);
+       if (show_rc == NULL || rc != LUSTRE_CFG_RC_NO_ERR) {
+               cYAML_free_tree(root);
+       } else if (show_rc != NULL && *show_rc != NULL) {
+               struct cYAML *show_node;
+               show_node = cYAML_get_object_item(*show_rc, oper);
+               if (show_node != NULL && cYAML_is_sequence(show_node)) {
+                       cYAML_insert_child(show_node, first_seq);
+                       free(ping_node);
+                       free(root);
+               } else if (show_node == NULL) {
+                       cYAML_insert_sibling((*show_rc)->cy_child,
+                                            ping_node);
+                       free(root);
+               } else {
+                       cYAML_free_tree(root);
+               }
+       } else {
+               *show_rc = root;
+       }
+
+       return rc;
+}
+
+int lustre_lnet_ping_nid(char *ping_nids, int timeout, int seq_no,
+                        struct cYAML **show_rc, struct cYAML **err_rc)
+{
+       int rc;
+
+       rc = infra_ping_nid(ping_nids, "ping", timeout, IOC_LIBCFS_PING_PEER,
+                           seq_no, show_rc, err_rc);
+       return rc;
+}
+
+int lustre_lnet_discover_nid(char *ping_nids, int force, int seq_no,
+                        struct cYAML **show_rc, struct cYAML **err_rc)
+{
+       int rc;
+
+       rc = infra_ping_nid(ping_nids, "discover", force, IOC_LIBCFS_DISCOVER,
+                           seq_no, show_rc, err_rc);
+       return rc;
+}
+
 int lustre_lnet_config_peer_nid(char *pnid, char **nid, int num_nids,
                                bool mr, int seq_no, struct cYAML **err_rc)
 {
@@ -567,7 +823,7 @@ int lustre_lnet_config_route(char *nw, char *gw, int hops, int prio,
        if (nw == NULL || gw == NULL) {
                snprintf(err_str,
                         sizeof(err_str),
-                        "\"missing mandatory parameter(s): '%s'\"",
+                        "\"missing mandatory parameter in route config:'%s'\"",
                         (nw == NULL && gw == NULL) ? "network, gateway" :
                         (nw == NULL) ? "network" : "gateway");
                rc = LUSTRE_CFG_RC_MISSING_PARAM;
@@ -650,7 +906,7 @@ int lustre_lnet_del_route(char *nw, char *gw,
        if (nw == NULL || gw == NULL) {
                snprintf(err_str,
                         sizeof(err_str),
-                        "\"missing mandatory parameter(s): '%s'\"",
+                        "\"missing mandatory parameter in route delete: '%s'\"",
                         (nw == NULL && gw == NULL) ? "network, gateway" :
                         (nw == NULL) ? "network" : "gateway");
                rc = LUSTRE_CFG_RC_MISSING_PARAM;
@@ -696,7 +952,7 @@ out:
 
 int lustre_lnet_show_route(char *nw, char *gw, int hops, int prio, int detail,
                           int seq_no, struct cYAML **show_rc,
-                          struct cYAML **err_rc)
+                          struct cYAML **err_rc, bool backup)
 {
        struct lnet_ioctl_config_data data;
        lnet_nid_t gateway_nid;
@@ -816,7 +1072,8 @@ int lustre_lnet_show_route(char *nw, char *gw, int hops, int prio, int detail,
                                                cfg_route.rtr_priority) == NULL)
                                goto out;
 
-                       if (cYAML_create_string(item, "state",
+                       if (!backup &&
+                           cYAML_create_string(item, "state",
                                                data.cfg_config_u.cfg_route.
                                                        rtr_flags ?
                                                "up" : "down") == NULL)
@@ -891,51 +1148,102 @@ static int socket_intf_query(int request, char *intf,
        return rc;
 }
 
+static int lustre_lnet_queryip(struct lnet_dlc_intf_descr *intf, __u32 *ip)
+{
+       struct ifreq ifr;
+       int rc;
+
+       memset(&ifr, 0, sizeof(ifr));
+       rc = socket_intf_query(SIOCGIFFLAGS, intf->intf_name, &ifr);
+       if (rc != 0)
+               return LUSTRE_CFG_RC_BAD_PARAM;
+
+       if ((ifr.ifr_flags & IFF_UP) == 0)
+               return LUSTRE_CFG_RC_BAD_PARAM;
+
+       memset(&ifr, 0, sizeof(ifr));
+       rc = socket_intf_query(SIOCGIFADDR, intf->intf_name, &ifr);
+       if (rc != 0)
+               return LUSTRE_CFG_RC_BAD_PARAM;
+
+       *ip = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
+       *ip = bswap_32(*ip);
+
+       return LUSTRE_CFG_RC_NO_ERR;
+}
+
 /*
  * for each interface in the array of interfaces find the IP address of
  * that interface, create its nid and add it to an array of NIDs.
  * Stop if any of the interfaces is down
  */
 static int lustre_lnet_intf2nids(struct lnet_dlc_network_descr *nw,
-                                lnet_nid_t **nids, __u32 *nnids)
+                                lnet_nid_t **nids, __u32 *nnids,
+                                char *err_str, size_t str_len)
 {
        int i = 0, count = 0, rc;
-       struct ifreq ifr;
-       __u32 ip;
        struct lnet_dlc_intf_descr *intf;
+       char val[LNET_MAX_STR_LEN];
+       __u32 ip;
+       int gni_num;
+
 
-       if (nw == NULL || nids == NULL)
+       if (nw == NULL || nids == NULL) {
+               snprintf(err_str, str_len,
+                        "\"unexpected parameters to lustre_lnet_intf2nids()\"");
+               err_str[str_len - 1] = '\0';
                return LUSTRE_CFG_RC_BAD_PARAM;
+       }
 
-       list_for_each_entry(intf, &nw->nw_intflist, intf_on_network)
-               count++;
+       if (LNET_NETTYP(nw->nw_id) == GNILND) {
+               count = 1;
+       } else {
+               list_for_each_entry(intf, &nw->nw_intflist, intf_on_network)
+                       count++;
+       }
 
        *nids = calloc(count, sizeof(lnet_nid_t));
-       if (*nids == NULL)
+       if (*nids == NULL) {
+               snprintf(err_str, str_len,
+                        "\"out of memory\"");
+               err_str[str_len - 1] = '\0';
                return LUSTRE_CFG_RC_OUT_OF_MEM;
-
-       list_for_each_entry(intf, &nw->nw_intflist, intf_on_network) {
-               memset(&ifr, 0, sizeof(ifr));
-               rc = socket_intf_query(SIOCGIFFLAGS, intf->intf_name, &ifr);
-               if (rc != 0)
-                       goto failed;
-
-               if ((ifr.ifr_flags & IFF_UP) == 0) {
-                       rc = LUSTRE_CFG_RC_BAD_PARAM;
+       }
+       /*
+        * special case the GNI interface since it doesn't have an IP
+        * address. The assumption is that there can only be one GNI
+        * interface in the system. No interface name is provided.
+        */
+       if (LNET_NETTYP(nw->nw_id) == GNILND) {
+               rc = read_sysfs_file(gni_nid_path, "nid", val,
+                               1, sizeof(val));
+               if (rc) {
+                       snprintf(err_str, str_len,
+                                "\"cannot read gni nid\"");
+                       err_str[str_len - 1] = '\0';
                        goto failed;
                }
+               gni_num = atoi(val);
 
-               memset(&ifr, 0, sizeof(ifr));
-               rc = socket_intf_query(SIOCGIFADDR, intf->intf_name, &ifr);
-               if (rc != 0)
-                       goto failed;
+               (*nids)[i] = LNET_MKNID(nw->nw_id, gni_num);
 
-               ip = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
-               ip = bswap_32(ip);
+               goto out;
+       }
+
+       /* look at the other interfaces */
+       list_for_each_entry(intf, &nw->nw_intflist, intf_on_network) {
+               rc = lustre_lnet_queryip(intf, &ip);
+               if (rc != LUSTRE_CFG_RC_NO_ERR) {
+                       snprintf(err_str, str_len,
+                                "\"couldn't query intf %s\"", intf->intf_name);
+                       err_str[str_len - 1] = '\0';
+                       goto failed;
+               }
                (*nids)[i] = LNET_MKNID(nw->nw_id, ip);
                i++;
        }
 
+out:
        *nnids = count;
 
        return 0;
@@ -1104,25 +1412,34 @@ int lustre_lnet_match_ip_to_intf(struct ifaddrs *ifa,
        return LUSTRE_CFG_RC_MATCH;
 }
 
-int lustre_lnet_resolve_ip2nets_rule(struct lustre_lnet_ip2nets *ip2nets,
-                                    lnet_nid_t **nids, __u32 *nnids)
+static int lustre_lnet_resolve_ip2nets_rule(struct lustre_lnet_ip2nets *ip2nets,
+                                           lnet_nid_t **nids, __u32 *nnids,
+                                           char *err_str, size_t str_len)
 {
        struct ifaddrs *ifa;
        int rc = LUSTRE_CFG_RC_NO_ERR;
 
        rc = getifaddrs(&ifa);
-       if (rc < 0)
+       if (rc < 0) {
+               snprintf(err_str, str_len,
+                        "\"failed to get interface addresses: %d\"", -errno);
+               err_str[str_len - 1] = '\0';
                return -errno;
+       }
 
        rc = lustre_lnet_match_ip_to_intf(ifa,
                                          &ip2nets->ip2nets_net.nw_intflist,
                                          &ip2nets->ip2nets_ip_ranges);
        if (rc != LUSTRE_CFG_RC_MATCH) {
+               snprintf(err_str, str_len,
+                        "\"couldn't match ip to existing interfaces\"");
+               err_str[str_len - 1] = '\0';
                freeifaddrs(ifa);
                return rc;
        }
 
-       rc = lustre_lnet_intf2nids(&ip2nets->ip2nets_net, nids, nnids);
+       rc = lustre_lnet_intf2nids(&ip2nets->ip2nets_net, nids, nnids,
+                                  err_str, sizeof(err_str));
        if (rc != LUSTRE_CFG_RC_NO_ERR) {
                *nids = NULL;
                *nnids = 0;
@@ -1240,13 +1557,10 @@ lustre_lnet_config_ip2nets(struct lustre_lnet_ip2nets *ip2nets,
         * The memory is allocated in that function then freed here when
         * it's no longer needed.
         */
-       rc = lustre_lnet_resolve_ip2nets_rule(ip2nets, &nids, &nnids);
-       if (rc != LUSTRE_CFG_RC_NO_ERR && rc != LUSTRE_CFG_RC_MATCH) {
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"cannot resolve ip2nets rule\"");
+       rc = lustre_lnet_resolve_ip2nets_rule(ip2nets, &nids, &nnids, err_str,
+                                             sizeof(err_str));
+       if (rc != LUSTRE_CFG_RC_NO_ERR && rc != LUSTRE_CFG_RC_MATCH)
                goto out;
-       }
 
        if (list_empty(&ip2nets->ip2nets_net.nw_intflist)) {
                snprintf(err_str, sizeof(err_str),
@@ -1287,10 +1601,14 @@ int lustre_lnet_config_ni(struct lnet_dlc_network_descr *nw_descr,
 
        snprintf(err_str, sizeof(err_str), "\"success\"");
 
-       if (ip2net == NULL && nw_descr == NULL) {
+       if (ip2net == NULL && (nw_descr == NULL || nw_descr->nw_id == 0 ||
+           (list_empty(&nw_descr->nw_intflist) &&
+            LNET_NETTYP(nw_descr->nw_id) != GNILND))) {
                snprintf(err_str,
                         sizeof(err_str),
-                        "\"mandatory parameters not specified.\"");
+                        "\"missing mandatory parameters in NI config: '%s'\"",
+                        (nw_descr == NULL) ? "network , interface" :
+                        (nw_descr->nw_id == 0) ? "network" : "interface");
                rc = LUSTRE_CFG_RC_MISSING_PARAM;
                goto out;
        }
@@ -1371,7 +1689,11 @@ int lustre_lnet_config_ni(struct lnet_dlc_network_descr *nw_descr,
                goto out;
        }
 
-       if (list_empty(&nw_descr->nw_intflist)) {
+       /*
+        * special case the GNI since no interface name is expected
+        */
+       if (list_empty(&nw_descr->nw_intflist) &&
+           (LNET_NETTYP(nw_descr->nw_id) != GNILND)) {
                snprintf(err_str,
                        sizeof(err_str),
                        "\"no interface name provided\"");
@@ -1379,10 +1701,9 @@ int lustre_lnet_config_ni(struct lnet_dlc_network_descr *nw_descr,
                goto out;
        }
 
-       rc = lustre_lnet_intf2nids(nw_descr, &nids, &nnids);
+       rc = lustre_lnet_intf2nids(nw_descr, &nids, &nnids,
+                                  err_str, sizeof(err_str));
        if (rc != 0) {
-               snprintf(err_str, sizeof(err_str),
-                        "\"bad parameter\"");
                rc = LUSTRE_CFG_RC_BAD_PARAM;
                goto out;
        }
@@ -1424,10 +1745,12 @@ int lustre_lnet_del_ni(struct lnet_dlc_network_descr *nw_descr,
 
        snprintf(err_str, sizeof(err_str), "\"success\"");
 
-       if (nw_descr == NULL) {
+       if (nw_descr == NULL || nw_descr->nw_id == 0) {
                snprintf(err_str,
                         sizeof(err_str),
-                        "\"missing mandatory parameter\"");
+                        "\"missing mandatory parameter in deleting NI: '%s'\"",
+                        (nw_descr == NULL) ? "network , interface" :
+                        (nw_descr->nw_id == 0) ? "network" : "interface");
                rc = LUSTRE_CFG_RC_MISSING_PARAM;
                goto out;
        }
@@ -1444,10 +1767,9 @@ int lustre_lnet_del_ni(struct lnet_dlc_network_descr *nw_descr,
                goto out;
        }
 
-       rc = lustre_lnet_intf2nids(nw_descr, &nids, &nnids);
+       rc = lustre_lnet_intf2nids(nw_descr, &nids, &nnids,
+                                  err_str, sizeof(err_str));
        if (rc != 0) {
-               snprintf(err_str, sizeof(err_str),
-                        "\"bad parameter\"");
                rc = LUSTRE_CFG_RC_BAD_PARAM;
                goto out;
        }
@@ -1495,13 +1817,56 @@ out:
        return rc;
 }
 
+static bool
+add_msg_stats_to_yaml_blk(struct cYAML *yaml,
+                         struct lnet_ioctl_comm_count *counts)
+{
+       if (cYAML_create_number(yaml, "put",
+                               counts->ico_put_count)
+                                       == NULL)
+               return false;
+       if (cYAML_create_number(yaml, "get",
+                               counts->ico_get_count)
+                                       == NULL)
+               return false;
+       if (cYAML_create_number(yaml, "reply",
+                               counts->ico_reply_count)
+                                       == NULL)
+               return false;
+       if (cYAML_create_number(yaml, "ack",
+                               counts->ico_ack_count)
+                                       == NULL)
+               return false;
+       if (cYAML_create_number(yaml, "hello",
+                               counts->ico_hello_count)
+                                       == NULL)
+               return false;
+
+       return true;
+}
+
+static struct lnet_ioctl_comm_count *
+get_counts(struct lnet_ioctl_element_msg_stats *msg_stats, int idx)
+{
+       if (idx == 0)
+               return &msg_stats->im_send_stats;
+       if (idx == 1)
+               return &msg_stats->im_recv_stats;
+       if (idx == 2)
+               return &msg_stats->im_drop_stats;
+
+       return NULL;
+}
+
 int lustre_lnet_show_net(char *nw, int detail, int seq_no,
-                        struct cYAML **show_rc, struct cYAML **err_rc)
+                        struct cYAML **show_rc, struct cYAML **err_rc,
+                        bool backup)
 {
        char *buf;
        struct lnet_ioctl_config_ni *ni_data;
        struct lnet_ioctl_config_lnd_tunables *lnd;
        struct lnet_ioctl_element_stats *stats;
+       struct lnet_ioctl_element_msg_stats msg_stats;
        __u32 net = LNET_NIDNET(LNET_NID_ANY);
        __u32 prev_net = LNET_NIDNET(LNET_NID_ANY);
        int rc = LUSTRE_CFG_RC_OUT_OF_MEM, i, j;
@@ -1572,6 +1937,10 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
                    net != rc_net)
                        continue;
 
+               /* if we're backing up don't store lo */
+               if (backup && LNET_NETTYP(rc_net) == LOLND)
+                       continue;
+
                /* default rc to -1 in case we hit the goto */
                rc = -1;
                exist = true;
@@ -1605,11 +1974,13 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
                if (first_seq == NULL)
                        first_seq = item;
 
-               if (cYAML_create_string(item, "nid",
+               if (!backup &&
+                   cYAML_create_string(item, "nid",
                                        libcfs_nid2str(ni_data->lic_nid)) == NULL)
                        goto out;
 
-               if (cYAML_create_string(item,
+               if (!backup &&
+                   cYAML_create_string(item,
                                        "status",
                                        (ni_data->lic_status ==
                                          LNET_NI_STATUS_UP) ?
@@ -1638,6 +2009,10 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
 
                if (detail) {
                        char *limit;
+                       int k;
+
+                       if (backup)
+                               goto continue_without_msg_stats;
 
                        statistics = cYAML_create_object(item, "statistics");
                        if (statistics == NULL)
@@ -1658,6 +2033,40 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
                                                        == NULL)
                                goto out;
 
+                       if (detail < 2)
+                               goto continue_without_msg_stats;
+
+                       LIBCFS_IOC_INIT_V2(msg_stats, im_hdr);
+                       msg_stats.im_hdr.ioc_len = sizeof(msg_stats);
+                       msg_stats.im_idx = i;
+
+                       rc = l_ioctl(LNET_DEV_ID,
+                                    IOC_LIBCFS_GET_LOCAL_NI_MSG_STATS,
+                                    &msg_stats);
+                       if (rc != 0) {
+                               l_errno = errno;
+                               goto continue_without_msg_stats;
+                       }
+
+                       for (k = 0; k < 3; k++) {
+                               struct lnet_ioctl_comm_count *counts;
+                               struct cYAML *msg_statistics = NULL;
+
+                               msg_statistics = cYAML_create_object(item,
+                                                (char *)gmsg_stat_names[k]);
+                               if (msg_statistics == NULL)
+                                       goto out;
+
+                               counts = get_counts(&msg_stats, k);
+                               if (counts == NULL)
+                                       goto out;
+
+                               if (!add_msg_stats_to_yaml_blk(msg_statistics,
+                                                              counts))
+                                       goto out;
+                       }
+
+continue_without_msg_stats:
                        tunables = cYAML_create_object(item, "tunables");
                        if (!tunables)
                                goto out;
@@ -1666,24 +2075,30 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
                        if (rc != LUSTRE_CFG_RC_NO_ERR)
                                goto out;
 
-                       tunables = cYAML_create_object(item, "lnd tunables");
-                       if (tunables == NULL)
-                               goto out;
-
                        rc = lustre_ni_show_tunables(tunables, LNET_NETTYP(rc_net),
                                                     &lnd->lt_tun);
-                       if (rc != LUSTRE_CFG_RC_NO_ERR)
+                       if (rc != LUSTRE_CFG_RC_NO_ERR &&
+                           rc != LUSTRE_CFG_RC_NO_MATCH)
                                goto out;
 
-                       if (cYAML_create_number(item, "tcp bonding",
-                                               ni_data->lic_tcp_bonding)
-                                                       == NULL)
-                               goto out;
+                       if (rc != LUSTRE_CFG_RC_NO_MATCH) {
+                               tunables = cYAML_create_object(item,
+                                                              "lnd tunables");
+                               if (tunables == NULL)
+                                       goto out;
+                       }
 
-                       if (cYAML_create_number(item, "dev cpt",
+                       if (!backup &&
+                           cYAML_create_number(item, "dev cpt",
                                                ni_data->lic_dev_cpt) == NULL)
                                goto out;
 
+                       if (!backup &&
+                           cYAML_create_number(item, "tcp bonding",
+                                               ni_data->lic_tcp_bonding)
+                                                       == NULL)
+                               goto out;
+
                        /* out put the CPTs in the format: "[x,x,x,...]" */
                        limit = str_buf + str_buf_len - 3;
                        pos += snprintf(pos, limit - pos, "\"[");
@@ -1777,38 +2192,81 @@ out:
        return rc;
 }
 
-int lustre_lnet_config_numa_range(int range, int seq_no, struct cYAML **err_rc)
+int ioctl_set_value(__u32 val, int ioc, char *name,
+                   int seq_no, struct cYAML **err_rc)
 {
-       struct lnet_ioctl_numa_range data;
+       struct lnet_ioctl_set_value data;
        int rc = LUSTRE_CFG_RC_NO_ERR;
        char err_str[LNET_MAX_STR_LEN];
 
        snprintf(err_str, sizeof(err_str), "\"success\"");
 
-       if (range < 0) {
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"range must be >= 0\"");
-               rc = LUSTRE_CFG_RC_OUT_OF_RANGE_PARAM;
-               goto out;
-       }
-
-       LIBCFS_IOC_INIT_V2(data, nr_hdr);
-       data.nr_range = range;
+       LIBCFS_IOC_INIT_V2(data, sv_hdr);
+       data.sv_value = val;
 
-       rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_SET_NUMA_RANGE, &data);
+       rc = l_ioctl(LNET_DEV_ID, ioc , &data);
        if (rc != 0) {
                rc = -errno;
                snprintf(err_str,
                         sizeof(err_str),
-                        "\"cannot configure buffers: %s\"", strerror(errno));
-               goto out;
+                        "\"cannot configure %s to %d: %s\"", name,
+                        val, strerror(errno));
        }
 
-out:
-       cYAML_build_error(rc, seq_no, ADD_CMD, "numa_range", err_str, err_rc);
+       cYAML_build_error(rc, seq_no, ADD_CMD, name, err_str, err_rc);
+
+       return rc;
+}
+
+int lustre_lnet_config_max_intf(int max, int seq_no, struct cYAML **err_rc)
+{
+       int rc = LUSTRE_CFG_RC_NO_ERR;
+       char err_str[LNET_MAX_STR_LEN];
+       char val[LNET_MAX_STR_LEN];
+
+       snprintf(err_str, sizeof(err_str), "\"success\"");
+
+       snprintf(val, sizeof(val), "%d", max);
+
+       rc = write_sysfs_file(modparam_path, "lnet_interfaces_max", val,
+                             1, strlen(val) + 1);
+       if (rc)
+               snprintf(err_str, sizeof(err_str),
+                        "\"cannot configure max interfaces: %s\"",
+                        strerror(errno));
+
+       cYAML_build_error(rc, seq_no, ADD_CMD, "max_interfaces", err_str, err_rc);
+
+       return rc;
+}
+
+int lustre_lnet_config_discovery(int enable, int seq_no, struct cYAML **err_rc)
+{
+       int rc = LUSTRE_CFG_RC_NO_ERR;
+       char err_str[LNET_MAX_STR_LEN];
+       char val[LNET_MAX_STR_LEN];
+
+       snprintf(err_str, sizeof(err_str), "\"success\"");
+
+       snprintf(val, sizeof(val), "%u", (enable) ? 0 : 1);
+
+       rc = write_sysfs_file(modparam_path, "lnet_peer_discovery_disabled", val,
+                             1, strlen(val) + 1);
+       if (rc)
+               snprintf(err_str, sizeof(err_str),
+                        "\"cannot configure discovery: %s\"",
+                        strerror(errno));
+
+       cYAML_build_error(rc, seq_no, ADD_CMD, "discovery", err_str, err_rc);
 
        return rc;
+
+}
+
+int lustre_lnet_config_numa_range(int range, int seq_no, struct cYAML **err_rc)
+{
+       return ioctl_set_value(range, IOC_LIBCFS_SET_NUMA_RANGE,
+                              "numa_range", seq_no, err_rc);
 }
 
 int lustre_lnet_config_buffers(int tiny, int small, int large, int seq_no,
@@ -1850,7 +2308,7 @@ out:
 }
 
 int lustre_lnet_show_routing(int seq_no, struct cYAML **show_rc,
-                            struct cYAML **err_rc)
+                            struct cYAML **err_rc, bool backup)
 {
        struct lnet_ioctl_config_data *data;
        struct lnet_ioctl_pool_cfg *pool_cfg = NULL;
@@ -1879,7 +2337,10 @@ int lustre_lnet_show_routing(int seq_no, struct cYAML **show_rc,
        if (root == NULL)
                goto out;
 
-       pools_node = cYAML_create_seq(root, "routing");
+       if (backup)
+               pools_node = cYAML_create_object(root, "routing");
+       else
+               pools_node = cYAML_create_seq(root, "routing");
        if (pools_node == NULL)
                goto out;
 
@@ -1899,6 +2360,9 @@ int lustre_lnet_show_routing(int seq_no, struct cYAML **show_rc,
 
                pool_cfg = (struct lnet_ioctl_pool_cfg *)data->cfg_bulk;
 
+               if (backup)
+                       goto calculate_buffers;
+
                snprintf(node_name, sizeof(node_name), "cpt[%d]", i);
                item = cYAML_create_seq_item(pools_node);
                if (item == NULL)
@@ -1911,24 +2375,31 @@ int lustre_lnet_show_routing(int seq_no, struct cYAML **show_rc,
                if (cpt == NULL)
                        goto out;
 
+calculate_buffers:
                /* create the tree  and print */
                for (j = 0; j < LNET_NRBPOOLS; j++) {
-                       type_node = cYAML_create_object(cpt, pools[j]);
-                       if (type_node == NULL)
-                               goto out;
-                       if (cYAML_create_number(type_node, "npages",
+                       if (!backup) {
+                               type_node = cYAML_create_object(cpt, pools[j]);
+                               if (type_node == NULL)
+                                       goto out;
+                       }
+                       if (!backup &&
+                           cYAML_create_number(type_node, "npages",
                                                pool_cfg->pl_pools[j].pl_npages)
                            == NULL)
                                goto out;
-                       if (cYAML_create_number(type_node, "nbuffers",
+                       if (!backup &&
+                           cYAML_create_number(type_node, "nbuffers",
                                                pool_cfg->pl_pools[j].
                                                  pl_nbuffers) == NULL)
                                goto out;
-                       if (cYAML_create_number(type_node, "credits",
+                       if (!backup &&
+                           cYAML_create_number(type_node, "credits",
                                                pool_cfg->pl_pools[j].
                                                   pl_credits) == NULL)
                                goto out;
-                       if (cYAML_create_number(type_node, "mincredits",
+                       if (!backup &&
+                           cYAML_create_number(type_node, "mincredits",
                                                pool_cfg->pl_pools[j].
                                                   pl_mincredits) == NULL)
                                goto out;
@@ -1939,6 +2410,15 @@ int lustre_lnet_show_routing(int seq_no, struct cYAML **show_rc,
        }
 
        if (pool_cfg != NULL) {
+               if (backup) {
+                       if (cYAML_create_number(pools_node, "enable",
+                                               pool_cfg->pl_routing) ==
+                       NULL)
+                               goto out;
+
+                       goto add_buffer_section;
+               }
+
                item = cYAML_create_seq_item(pools_node);
                if (item == NULL)
                        goto out;
@@ -1948,6 +2428,7 @@ int lustre_lnet_show_routing(int seq_no, struct cYAML **show_rc,
                        goto out;
        }
 
+add_buffer_section:
        /* create a buffers entry in the show. This is necessary so that
         * if the YAML output is used to configure a node, the buffer
         * configuration takes hold */
@@ -2003,7 +2484,8 @@ out:
 }
 
 int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
-                         struct cYAML **show_rc, struct cYAML **err_rc)
+                         struct cYAML **show_rc, struct cYAML **err_rc,
+                         bool backup)
 {
        /*
         * TODO: This function is changing in a future patch to accommodate
@@ -2012,22 +2494,24 @@ int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
        struct lnet_ioctl_peer_cfg peer_info;
        struct lnet_peer_ni_credit_info *lpni_cri;
        struct lnet_ioctl_element_stats *lpni_stats;
-       int rc = LUSTRE_CFG_RC_OUT_OF_MEM, ncpt = 0, i = 0, j = 0;
+       struct lnet_ioctl_element_msg_stats *msg_stats;
+       lnet_nid_t *nidp;
+       int rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+       int i, j, k;
        int l_errno = 0;
+       __u32 count;
+       __u32 size;
        struct cYAML *root = NULL, *peer = NULL, *peer_ni = NULL,
-                    *first_seq = NULL, *peer_root = NULL, *tmp = NULL;
+                    *first_seq = NULL, *peer_root = NULL, *tmp = NULL,
+                    *msg_statistics = NULL, *statistics = NULL;
        char err_str[LNET_MAX_STR_LEN];
-       lnet_nid_t prev_primary_nid = LNET_NID_ANY, primary_nid = LNET_NID_ANY;
-       int data_size = sizeof(*lpni_cri) + sizeof(*lpni_stats);
-       char *data = malloc(data_size);
-       bool new_peer = true;
+       struct lnet_process_id *list = NULL;
+       void *data = NULL;
+       void *lpni_data;
 
        snprintf(err_str, sizeof(err_str),
                 "\"out of memory\"");
 
-       if (data == NULL)
-               goto out;
-
        /* create struct cYAML root object */
        root = cYAML_create_object(NULL, NULL);
        if (root == NULL)
@@ -2037,72 +2521,139 @@ int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
        if (peer_root == NULL)
                goto out;
 
-       if (knid != NULL)
-               primary_nid = libcfs_str2nid(knid);
-
-       do {
-               for (i = 0;; i++) {
-                       memset(data, 0, data_size);
+       count = 1000;
+       size = count * sizeof(struct lnet_process_id);
+       list = malloc(size);
+       if (list == NULL) {
+               l_errno = ENOMEM;
+               goto out;
+       }
+       if (knid != NULL) {
+               list[0].nid = libcfs_str2nid(knid);
+               count = 1;
+       } else {
+               for (;;) {
                        memset(&peer_info, 0, sizeof(peer_info));
                        LIBCFS_IOC_INIT_V2(peer_info, prcfg_hdr);
                        peer_info.prcfg_hdr.ioc_len = sizeof(peer_info);
-                       peer_info.prcfg_count = i;
-                       peer_info.prcfg_bulk = (void *)data;
-                       peer_info.prcfg_size = data_size;
+                       peer_info.prcfg_size = size;
+                       peer_info.prcfg_bulk = list;
+
+                       l_errno = 0;
+                       rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_GET_PEER_LIST,
+                                    &peer_info);
+                       count = peer_info.prcfg_count;
+                       if (rc == 0)
+                               break;
+                       l_errno = errno;
+                       if (l_errno != E2BIG) {
+                               snprintf(err_str,
+                                       sizeof(err_str),
+                                       "\"cannot get peer list: %s\"",
+                                       strerror(l_errno));
+                               rc = -l_errno;
+                               goto out;
+                       }
+                       free(list);
+                       size = peer_info.prcfg_size;
+                       list = malloc(size);
+                       if (list == NULL) {
+                               l_errno = ENOMEM;
+                               goto out;
+                       }
+               }
+       }
 
-                       rc = l_ioctl(LNET_DEV_ID,
-                                    IOC_LIBCFS_GET_PEER_NI, &peer_info);
-                       if (rc != 0) {
-                               l_errno = errno;
+       size = 4096;
+       data = malloc(size);
+       if (data == NULL) {
+               l_errno = ENOMEM;
+               goto out;
+       }
+       for (i = 0; i < count; i++) {
+               for (;;) {
+                       memset(&peer_info, 0, sizeof(peer_info));
+                       LIBCFS_IOC_INIT_V2(peer_info, prcfg_hdr);
+                       peer_info.prcfg_hdr.ioc_len = sizeof(peer_info);
+                       peer_info.prcfg_prim_nid = list[i].nid;
+                       peer_info.prcfg_size = size;
+                       peer_info.prcfg_bulk = data;
+
+                       l_errno = 0;
+                       rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_GET_PEER_NI,
+                                    &peer_info);
+                       if (rc == 0)
                                break;
+                       l_errno = errno;
+                       if (l_errno != E2BIG) {
+                               snprintf(err_str,
+                                       sizeof(err_str),
+                                       "\"cannot get peer information: %s\"",
+                                       strerror(l_errno));
+                               rc = -l_errno;
+                               goto out;
+                       }
+                       free(data);
+                       size = peer_info.prcfg_size;
+                       data = malloc(size);
+                       if (data == NULL) {
+                               l_errno = ENOMEM;
+                               goto out;
                        }
+               }
 
-                       if (primary_nid != LNET_NID_ANY &&
-                           primary_nid != peer_info.prcfg_prim_nid)
-                                       continue;
+               peer = cYAML_create_seq_item(peer_root);
+               if (peer == NULL)
+                       goto out;
 
-                       lpni_cri = peer_info.prcfg_bulk;
-                       lpni_stats = peer_info.prcfg_bulk + sizeof(*lpni_cri);
+               if (first_seq == NULL)
+                       first_seq = peer;
 
-                       peer = cYAML_create_seq_item(peer_root);
-                       if (peer == NULL)
+               lnet_nid_t pnid = peer_info.prcfg_prim_nid;
+               if (cYAML_create_string(peer, "primary nid",
+                                       libcfs_nid2str(pnid))
+                   == NULL)
+                       goto out;
+               if (cYAML_create_string(peer, "Multi-Rail",
+                                       peer_info.prcfg_mr ? "True" : "False")
+                   == NULL)
+                       goto out;
+               /*
+                * print out the state of the peer only if details are
+                * requested
+                */
+               if (detail >= 3) {
+                       if (!backup &&
+                           cYAML_create_number(peer, "peer state",
+                                               peer_info.prcfg_state)
+                               == NULL)
                                goto out;
+               }
 
-                       if (peer_info.prcfg_prim_nid != prev_primary_nid) {
-                               prev_primary_nid = peer_info.prcfg_prim_nid;
-                               new_peer = true;
-                       }
-
-                       if (new_peer) {
-                               lnet_nid_t pnid = peer_info.prcfg_prim_nid;
-                               if (cYAML_create_string(peer, "primary nid",
-                                                       libcfs_nid2str(pnid))
-                                   == NULL)
-                                       goto out;
-                               if (cYAML_create_string(peer, "Multi-Rail",
-                                                       peer_info.prcfg_mr ?
-                                                       "True" : "False")
-                                   == NULL)
-                                       goto out;
-                               tmp = cYAML_create_seq(peer, "peer ni");
-                               if (tmp == NULL)
-                                       goto out;
-                               new_peer = false;
-                       }
+               tmp = cYAML_create_seq(peer, "peer ni");
+               if (tmp == NULL)
+                       goto out;
 
-                       if (first_seq == NULL)
-                               first_seq = peer;
+               lpni_data = data;
+               for (j = 0; j < peer_info.prcfg_count; j++) {
+                       nidp = lpni_data;
+                       lpni_cri = (void*)nidp + sizeof(nidp);
+                       lpni_stats = (void *)lpni_cri + sizeof(*lpni_cri);
+                       msg_stats = (void *)lpni_stats + sizeof(*lpni_stats);
+                       lpni_data = (void *)msg_stats + sizeof(*msg_stats);
 
                        peer_ni = cYAML_create_seq_item(tmp);
                        if (peer_ni == NULL)
                                goto out;
 
                        if (cYAML_create_string(peer_ni, "nid",
-                                               libcfs_nid2str
-                                                (peer_info.prcfg_cfg_nid))
+                                               libcfs_nid2str(*nidp))
                            == NULL)
                                goto out;
 
+                       if (backup)
+                               continue;
+
                        if (cYAML_create_string(peer_ni, "state",
                                                lpni_cri->cr_aliveness)
                            == NULL)
@@ -2141,37 +2692,162 @@ int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
                            == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "send_count",
+                       if (cYAML_create_number(peer_ni, "refcount",
+                                               lpni_cri->cr_refcount) == NULL)
+                               goto out;
+
+                       statistics = cYAML_create_object(peer_ni, "statistics");
+                       if (statistics == NULL)
+                               goto out;
+
+                       if (cYAML_create_number(statistics, "send_count",
                                                lpni_stats->iel_send_count)
                            == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "recv_count",
+                       if (cYAML_create_number(statistics, "recv_count",
                                                lpni_stats->iel_recv_count)
                            == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "drop_count",
+                       if (cYAML_create_number(statistics, "drop_count",
                                                lpni_stats->iel_drop_count)
                            == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "refcount",
-                                               lpni_cri->cr_refcount) == NULL)
-                               goto out;
+                       if (detail < 2)
+                               continue;
+
+                       for (k = 0; k < 3; k++) {
+                               struct lnet_ioctl_comm_count *counts;
+
+                               msg_statistics = cYAML_create_object(peer_ni,
+                                                (char *) gmsg_stat_names[k]);
+                               if (msg_statistics == NULL)
+                                       goto out;
+
+                               counts = get_counts(msg_stats, k);
+                               if (counts == NULL)
+                                       goto out;
+
+                               if (!add_msg_stats_to_yaml_blk(msg_statistics,
+                                                              counts))
+                                       goto out;
+                       }
+
                }
+       }
 
-               if (l_errno != ENOENT) {
+       /* print output iff show_rc is not provided */
+       if (show_rc == NULL)
+               cYAML_print_tree(root);
+
+       snprintf(err_str, sizeof(err_str), "\"success\"");
+       rc = LUSTRE_CFG_RC_NO_ERR;
+
+out:
+       free(list);
+       free(data);
+       if (show_rc == NULL || rc != LUSTRE_CFG_RC_NO_ERR) {
+               cYAML_free_tree(root);
+       } else if (show_rc != NULL && *show_rc != NULL) {
+               struct cYAML *show_node;
+               /* find the peer node, if one doesn't exist then
+                * insert one.  Otherwise add to the one there
+                */
+               show_node = cYAML_get_object_item(*show_rc,
+                                                 "peer");
+               if (show_node != NULL && cYAML_is_sequence(show_node)) {
+                       cYAML_insert_child(show_node, first_seq);
+                       free(peer_root);
+                       free(root);
+               } else if (show_node == NULL) {
+                       cYAML_insert_sibling((*show_rc)->cy_child,
+                                            peer_root);
+                       free(root);
+               } else {
+                       cYAML_free_tree(root);
+               }
+       } else {
+               *show_rc = root;
+       }
+
+       cYAML_build_error(rc, seq_no, SHOW_CMD, "peer", err_str,
+                         err_rc);
+
+       return rc;
+}
+
+int lustre_lnet_list_peer(int seq_no,
+                         struct cYAML **show_rc, struct cYAML **err_rc)
+{
+       struct lnet_ioctl_peer_cfg peer_info;
+       int rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+       __u32 count;
+       __u32 size;
+       int i = 0;
+       int l_errno = 0;
+       struct cYAML *root = NULL, *list_root = NULL, *first_seq = NULL;
+       char err_str[LNET_MAX_STR_LEN];
+       struct lnet_process_id *list = NULL;
+
+       snprintf(err_str, sizeof(err_str),
+                "\"out of memory\"");
+
+       memset(&peer_info, 0, sizeof(peer_info));
+
+       /* create struct cYAML root object */
+       root = cYAML_create_object(NULL, NULL);
+       if (root == NULL)
+               goto out;
+
+       list_root = cYAML_create_seq(root, "peer list");
+       if (list_root == NULL)
+               goto out;
+
+       count = 1000;
+       size = count * sizeof(struct lnet_process_id);
+       list = malloc(size);
+       if (list == NULL) {
+               l_errno = ENOMEM;
+               goto out;
+       }
+       for (;;) {
+               LIBCFS_IOC_INIT_V2(peer_info, prcfg_hdr);
+               peer_info.prcfg_hdr.ioc_len = sizeof(peer_info);
+               peer_info.prcfg_size = size;
+               peer_info.prcfg_bulk = list;
+
+               l_errno = 0;
+               rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_GET_PEER_LIST, &peer_info);
+               count = peer_info.prcfg_count;
+               if (rc == 0)
+                       break;
+               l_errno = errno;
+               if (l_errno != E2BIG) {
                        snprintf(err_str,
                                sizeof(err_str),
-                               "\"cannot get peer information: %s\"",
+                               "\"cannot get peer list: %s\"",
                                strerror(l_errno));
                        rc = -l_errno;
                        goto out;
                }
+               free(list);
+               size = peer_info.prcfg_size;
+               list = malloc(size);
+               if (list == NULL) {
+                       l_errno = ENOMEM;
+                       goto out;
+               }
+       }
 
-               j++;
-       } while (j < ncpt);
+       /* count is now the actual number of ids in the list. */
+       for (i = 0; i < count; i++) {
+               if (cYAML_create_string(list_root, "nid",
+                                       libcfs_nid2str(list[i].nid))
+                   == NULL)
+                       goto out;
+       }
 
        /* print output iff show_rc is not provided */
        if (show_rc == NULL)
@@ -2181,6 +2857,8 @@ int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
        rc = LUSTRE_CFG_RC_NO_ERR;
 
 out:
+       if (list != NULL)
+               free(list);
        if (show_rc == NULL || rc != LUSTRE_CFG_RC_NO_ERR) {
                cYAML_free_tree(root);
        } else if (show_rc != NULL && *show_rc != NULL) {
@@ -2192,11 +2870,11 @@ out:
                                                  "peer");
                if (show_node != NULL && cYAML_is_sequence(show_node)) {
                        cYAML_insert_child(show_node, first_seq);
-                       free(peer_root);
+                       free(list_root);
                        free(root);
                } else if (show_node == NULL) {
                        cYAML_insert_sibling((*show_rc)->cy_child,
-                                            peer_root);
+                                            list_root);
                        free(root);
                } else {
                        cYAML_free_tree(root);
@@ -2211,65 +2889,155 @@ out:
        return rc;
 }
 
-int lustre_lnet_show_numa_range(int seq_no, struct cYAML **show_rc,
-                               struct cYAML **err_rc)
+static void add_to_global(struct cYAML *show_rc, struct cYAML *node,
+                         struct cYAML *root)
 {
-       struct lnet_ioctl_numa_range data;
-       int rc;
-       int l_errno;
-       char err_str[LNET_MAX_STR_LEN];
-       struct cYAML *root = NULL, *range = NULL;
+       struct cYAML *show_node;
 
-       snprintf(err_str, sizeof(err_str), "\"out of memory\"");
+       show_node = cYAML_get_object_item(show_rc, "global");
+       if (show_node != NULL)
+               cYAML_insert_sibling(show_node->cy_child,
+                                    node->cy_child);
+       else
+               cYAML_insert_sibling(show_rc->cy_child,
+                                    node);
+       free(root);
+}
 
-       LIBCFS_IOC_INIT_V2(data, nr_hdr);
+static int build_global_yaml_entry(char *err_str, int err_len, int seq_no,
+                                  char *name, __u32 value,
+                                  struct cYAML **show_rc,
+                                  struct cYAML **err_rc, int err)
+{
+       int rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+       struct cYAML *root = NULL, *global = NULL;
 
-       rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_GET_NUMA_RANGE, &data);
-       if (rc != 0) {
-               l_errno = errno;
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"cannot get numa range: %s\"",
-                        strerror(l_errno));
-               rc = -l_errno;
+       if (err) {
+               rc = err;
                goto out;
        }
 
-       rc = LUSTRE_CFG_RC_OUT_OF_MEM;
-
        root = cYAML_create_object(NULL, NULL);
        if (root == NULL)
                goto out;
 
-       range = cYAML_create_object(root, "numa");
-       if (range == NULL)
+       global = cYAML_create_object(root, "global");
+       if (global == NULL)
                goto out;
 
-       if (cYAML_create_number(range, "range",
-                               data.nr_range) == NULL)
+       if (cYAML_create_number(global, name,
+                               value) == NULL)
                goto out;
 
        if (show_rc == NULL)
                cYAML_print_tree(root);
 
-       snprintf(err_str, sizeof(err_str), "\"success\"");
+       snprintf(err_str, err_len, "\"success\"");
+
        rc = LUSTRE_CFG_RC_NO_ERR;
+
 out:
        if (show_rc == NULL || rc != LUSTRE_CFG_RC_NO_ERR) {
                cYAML_free_tree(root);
        } else if (show_rc != NULL && *show_rc != NULL) {
-               cYAML_insert_sibling((*show_rc)->cy_child,
-                                       root->cy_child);
-               free(root);
+               add_to_global(*show_rc, global, root);
        } else {
                *show_rc = root;
        }
 
-       cYAML_build_error(rc, seq_no, SHOW_CMD, "numa", err_str, err_rc);
+       cYAML_build_error(rc, seq_no, SHOW_CMD, "global", err_str, err_rc);
 
        return rc;
 }
 
+static int ioctl_show_global_values(int ioc, int seq_no, char *name,
+                                   struct cYAML **show_rc,
+                                   struct cYAML **err_rc)
+{
+       struct lnet_ioctl_set_value data;
+       int rc;
+       int l_errno = 0;
+       char err_str[LNET_MAX_STR_LEN];
+
+       snprintf(err_str, sizeof(err_str), "\"out of memory\"");
+
+       LIBCFS_IOC_INIT_V2(data, sv_hdr);
+
+       rc = l_ioctl(LNET_DEV_ID, ioc, &data);
+       if (rc != 0) {
+               l_errno = -errno;
+               snprintf(err_str,
+                        sizeof(err_str),
+                        "\"cannot get %s: %s\"",
+                        name, strerror(l_errno));
+       }
+
+       return build_global_yaml_entry(err_str, sizeof(err_str), seq_no, name,
+                                      data.sv_value, show_rc, err_rc, l_errno);
+}
+
+int lustre_lnet_show_max_intf(int seq_no, struct cYAML **show_rc,
+                             struct cYAML **err_rc)
+{
+       int rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+       char val[LNET_MAX_STR_LEN];
+       int max_intf = -1, l_errno = 0;
+       char err_str[LNET_MAX_STR_LEN];
+
+       snprintf(err_str, sizeof(err_str), "\"out of memory\"");
+
+       rc = read_sysfs_file(modparam_path, "lnet_interfaces_max", val,
+                            1, sizeof(val));
+       if (rc) {
+               l_errno = -errno;
+               snprintf(err_str, sizeof(err_str),
+                        "\"cannot get max interfaces: %d\"", rc);
+       } else {
+               max_intf = atoi(val);
+       }
+
+       return build_global_yaml_entry(err_str, sizeof(err_str), seq_no,
+                                      "max_intf", max_intf, show_rc,
+                                      err_rc, l_errno);
+}
+
+int lustre_lnet_show_discovery(int seq_no, struct cYAML **show_rc,
+                              struct cYAML **err_rc)
+{
+       int rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+       char val[LNET_MAX_STR_LEN];
+       int discovery = -1, l_errno = 0;
+       char err_str[LNET_MAX_STR_LEN];
+
+       snprintf(err_str, sizeof(err_str), "\"out of memory\"");
+
+       rc = read_sysfs_file(modparam_path, "lnet_peer_discovery_disabled", val,
+                            1, sizeof(val));
+       if (rc) {
+               l_errno = -errno;
+               snprintf(err_str, sizeof(err_str),
+                        "\"cannot get discovery setting: %d\"", rc);
+       } else {
+               /*
+                * The kernel stores a discovery disabled value. User space
+                * shows whether discovery is enabled. So the value must be
+                * inverted.
+                */
+               discovery = !atoi(val);
+       }
+
+       return build_global_yaml_entry(err_str, sizeof(err_str), seq_no,
+                                      "discovery", discovery, show_rc,
+                                      err_rc, l_errno);
+}
+
+int lustre_lnet_show_numa_range(int seq_no, struct cYAML **show_rc,
+                               struct cYAML **err_rc)
+{
+       return ioctl_show_global_values(IOC_LIBCFS_GET_NUMA_RANGE, seq_no,
+                                       "numa_range", show_rc, err_rc);
+}
+
 int lustre_lnet_show_stats(int seq_no, struct cYAML **show_rc,
                           struct cYAML **err_rc)
 {
@@ -2972,8 +3740,7 @@ static int handle_yaml_show_route(struct cYAML *tree, struct cYAML **show_rc,
                                      (prio) ? prio->cy_valueint : -1,
                                      (detail) ? detail->cy_valueint : 0,
                                      (seq_no) ? seq_no->cy_valueint : -1,
-                                     show_rc,
-                                     err_rc);
+                                     show_rc, err_rc, false);
 }
 
 static int handle_yaml_show_net(struct cYAML *tree, struct cYAML **show_rc,
@@ -2988,8 +3755,7 @@ static int handle_yaml_show_net(struct cYAML *tree, struct cYAML **show_rc,
        return lustre_lnet_show_net((net) ? net->cy_valuestring : NULL,
                                    (detail) ? detail->cy_valueint : 0,
                                    (seq_no) ? seq_no->cy_valueint : -1,
-                                   show_rc,
-                                   err_rc);
+                                   show_rc, err_rc, false);
 }
 
 static int handle_yaml_show_routing(struct cYAML *tree, struct cYAML **show_rc,
@@ -3000,7 +3766,7 @@ static int handle_yaml_show_routing(struct cYAML *tree, struct cYAML **show_rc,
        seq_no = cYAML_get_object_item(tree, "seq_no");
 
        return lustre_lnet_show_routing((seq_no) ? seq_no->cy_valueint : -1,
-                                       show_rc, err_rc);
+                                       show_rc, err_rc, false);
 }
 
 static int handle_yaml_show_peers(struct cYAML *tree, struct cYAML **show_rc,
@@ -3015,7 +3781,7 @@ static int handle_yaml_show_peers(struct cYAML *tree, struct cYAML **show_rc,
        return lustre_lnet_show_peer((nid) ? nid->cy_valuestring : NULL,
                                     (detail) ? detail->cy_valueint : 0,
                                     (seq_no) ? seq_no->cy_valueint : -1,
-                                    show_rc, err_rc);
+                                    show_rc, err_rc, false);
 }
 
 static int handle_yaml_show_stats(struct cYAML *tree, struct cYAML **show_rc,
@@ -3064,6 +3830,135 @@ static int handle_yaml_show_numa(struct cYAML *tree, struct cYAML **show_rc,
                                           show_rc, err_rc);
 }
 
+static int handle_yaml_config_global_settings(struct cYAML *tree,
+                                             struct cYAML **show_rc,
+                                             struct cYAML **err_rc)
+{
+       struct cYAML *max_intf, *numa, *discovery, *seq_no;
+       int rc = 0;
+
+       seq_no = cYAML_get_object_item(tree, "seq_no");
+       max_intf = cYAML_get_object_item(tree, "max_intf");
+       if (max_intf)
+               rc = lustre_lnet_config_max_intf(max_intf->cy_valueint,
+                                                seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                                err_rc);
+
+       numa = cYAML_get_object_item(tree, "numa_range");
+       if (numa)
+               rc = lustre_lnet_config_numa_range(numa->cy_valueint,
+                                                  seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                                  err_rc);
+
+       discovery = cYAML_get_object_item(tree, "discovery");
+       if (discovery)
+               rc = lustre_lnet_config_discovery(discovery->cy_valueint,
+                                                 seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                                 err_rc);
+
+       return rc;
+}
+
+static int handle_yaml_del_global_settings(struct cYAML *tree,
+                                          struct cYAML **show_rc,
+                                          struct cYAML **err_rc)
+{
+       struct cYAML *max_intf, *numa, *discovery, *seq_no;
+       int rc = 0;
+
+       seq_no = cYAML_get_object_item(tree, "seq_no");
+       max_intf = cYAML_get_object_item(tree, "max_intf");
+       if (max_intf)
+               rc = lustre_lnet_config_max_intf(LNET_INTERFACES_MAX_DEFAULT,
+                                                seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                                err_rc);
+
+       numa = cYAML_get_object_item(tree, "numa_range");
+       if (numa)
+               rc = lustre_lnet_config_numa_range(0,
+                                                  seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                                  err_rc);
+
+       /* peer discovery is enabled by default */
+       discovery = cYAML_get_object_item(tree, "discovery");
+       if (discovery)
+               rc = lustre_lnet_config_discovery(1,
+                                                 seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                                 err_rc);
+
+       return rc;
+}
+
+static int handle_yaml_show_global_settings(struct cYAML *tree,
+                                           struct cYAML **show_rc,
+                                           struct cYAML **err_rc)
+{
+       struct cYAML *max_intf, *numa, *discovery, *seq_no;
+       int rc = 0;
+
+       seq_no = cYAML_get_object_item(tree, "seq_no");
+       max_intf = cYAML_get_object_item(tree, "max_intf");
+       if (max_intf)
+               rc = lustre_lnet_show_max_intf(seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                               show_rc, err_rc);
+
+       numa = cYAML_get_object_item(tree, "numa_range");
+       if (numa)
+               rc = lustre_lnet_show_numa_range(seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                                show_rc, err_rc);
+
+       discovery = cYAML_get_object_item(tree, "discovery");
+       if (discovery)
+               rc = lustre_lnet_show_discovery(seq_no ? seq_no->cy_valueint
+                                                       : -1,
+                                               show_rc, err_rc);
+
+       return rc;
+}
+
+static int handle_yaml_ping(struct cYAML *tree, struct cYAML **show_rc,
+                           struct cYAML **err_rc)
+{
+       struct cYAML *seq_no, *nid, *timeout;
+
+       seq_no = cYAML_get_object_item(tree, "seq_no");
+       nid = cYAML_get_object_item(tree, "primary nid");
+       timeout = cYAML_get_object_item(tree, "timeout");
+
+       return lustre_lnet_ping_nid((nid) ? nid->cy_valuestring : NULL,
+                                   (timeout) ? timeout->cy_valueint : 1000,
+                                   (seq_no) ? seq_no->cy_valueint : -1,
+                                   show_rc, err_rc);
+}
+
+static int handle_yaml_discover(struct cYAML *tree, struct cYAML **show_rc,
+                               struct cYAML **err_rc)
+{
+       struct cYAML *seq_no, *nid, *force;
+
+       seq_no = cYAML_get_object_item(tree, "seq_no");
+       nid = cYAML_get_object_item(tree, "primary nid");
+       force = cYAML_get_object_item(tree, "force");
+
+       return lustre_lnet_discover_nid((nid) ? nid->cy_valuestring : NULL,
+                                       (force) ? force->cy_valueint : 0,
+                                       (seq_no) ? seq_no->cy_valueint : -1,
+                                       show_rc, err_rc);
+}
+
+static int handle_yaml_no_op()
+{
+       return LUSTRE_CFG_RC_NO_ERR;
+}
+
 struct lookup_cmd_hdlr_tbl {
        char *name;
        cmd_handler_t cb;
@@ -3076,25 +3971,53 @@ static struct lookup_cmd_hdlr_tbl lookup_config_tbl[] = {
        { .name = "peer",       .cb = handle_yaml_config_peer },
        { .name = "routing",    .cb = handle_yaml_config_routing },
        { .name = "buffers",    .cb = handle_yaml_config_buffers },
+       { .name = "statistics", .cb = handle_yaml_no_op },
+       { .name = "global",     .cb = handle_yaml_config_global_settings},
        { .name = "numa",       .cb = handle_yaml_config_numa },
+       { .name = "ping",       .cb = handle_yaml_no_op },
+       { .name = "discover",   .cb = handle_yaml_no_op },
        { .name = NULL } };
 
 static struct lookup_cmd_hdlr_tbl lookup_del_tbl[] = {
        { .name = "route",      .cb = handle_yaml_del_route },
        { .name = "net",        .cb = handle_yaml_del_ni },
+       { .name = "ip2nets",    .cb = handle_yaml_no_op },
        { .name = "peer",       .cb = handle_yaml_del_peer },
        { .name = "routing",    .cb = handle_yaml_del_routing },
+       { .name = "buffers",    .cb = handle_yaml_no_op },
+       { .name = "statistics", .cb = handle_yaml_no_op },
+       { .name = "global",     .cb = handle_yaml_del_global_settings},
        { .name = "numa",       .cb = handle_yaml_del_numa },
+       { .name = "ping",       .cb = handle_yaml_no_op },
+       { .name = "discover",   .cb = handle_yaml_no_op },
        { .name = NULL } };
 
 static struct lookup_cmd_hdlr_tbl lookup_show_tbl[] = {
        { .name = "route",      .cb = handle_yaml_show_route },
        { .name = "net",        .cb = handle_yaml_show_net },
-       { .name = "buffers",    .cb = handle_yaml_show_routing },
-       { .name = "routing",    .cb = handle_yaml_show_routing },
        { .name = "peer",       .cb = handle_yaml_show_peers },
+       { .name = "ip2nets",    .cb = handle_yaml_no_op },
+       { .name = "routing",    .cb = handle_yaml_show_routing },
+       { .name = "buffers",    .cb = handle_yaml_show_routing },
        { .name = "statistics", .cb = handle_yaml_show_stats },
+       { .name = "global",     .cb = handle_yaml_show_global_settings},
        { .name = "numa",       .cb = handle_yaml_show_numa },
+       { .name = "ping",       .cb = handle_yaml_no_op },
+       { .name = "discover",   .cb = handle_yaml_no_op },
+       { .name = NULL } };
+
+static struct lookup_cmd_hdlr_tbl lookup_exec_tbl[] = {
+       { .name = "route",      .cb = handle_yaml_no_op },
+       { .name = "net",        .cb = handle_yaml_no_op },
+       { .name = "peer",       .cb = handle_yaml_no_op },
+       { .name = "ip2nets",    .cb = handle_yaml_no_op },
+       { .name = "routing",    .cb = handle_yaml_no_op },
+       { .name = "buffers",    .cb = handle_yaml_no_op },
+       { .name = "statistics", .cb = handle_yaml_no_op },
+       { .name = "global",     .cb = handle_yaml_no_op },
+       { .name = "numa",       .cb = handle_yaml_no_op },
+       { .name = "ping",       .cb = handle_yaml_ping },
+       { .name = "discover",   .cb = handle_yaml_discover },
        { .name = NULL } };
 
 static cmd_handler_t lookup_fn(char *key,
@@ -3176,3 +4099,8 @@ int lustre_yaml_show(char *f, struct cYAML **show_rc, struct cYAML **err_rc)
                                     show_rc, err_rc);
 }
 
+int lustre_yaml_exec(char *f, struct cYAML **show_rc, struct cYAML **err_rc)
+{
+       return lustre_yaml_cb_helper(f, lookup_exec_tbl,
+                                    show_rc, err_rc);
+}