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LU-9480 lnet: add enhanced statistics
[fs/lustre-release.git] / lnet / utils / lnetconfig / liblnetconfig.c
index a0ade5f..f172698 100644 (file)
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include <sys/ioctl.h>
 #include <net/if.h>
 #include <libcfs/util/ioctl.h>
-#include <lnet/lnetctl.h>
-#include <lnet/socklnd.h>
+#include <linux/lnet/lnetctl.h>
 #include "liblnd.h"
-#include <lnet/lnet.h>
-#include <libcfs/libcfs_string.h>
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <ifaddrs.h>
 #include "liblnetconfig.h"
 #include "cyaml.h"
 #define DEL_CMD                        "del"
 #define SHOW_CMD               "show"
 #define DBG_CMD                        "dbg"
+#define MANAGE_CMD              "manage"
+
+#define modparam_path "/sys/module/lnet/parameters/"
+
+const char *gmsg_stat_names[] = {"sent_stats", "received_stats",
+                                "dropped_stats"};
 
 /*
  * lustre_lnet_ip_range_descr
@@ -79,6 +85,76 @@ 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.
+ */
+void free_intf_descr(struct lnet_dlc_intf_descr *intf_descr)
+{
+       if (!intf_descr)
+               return;
+
+       if (intf_descr->cpt_expr != NULL)
+               cfs_expr_list_free(intf_descr->cpt_expr);
+       free(intf_descr);
+}
+
 /*
  * lustre_lnet_add_ip_range
  * Formatting:
@@ -311,9 +387,8 @@ int lustre_lnet_parse_interfaces(char *intf_str,
 failed:
        list_for_each_entry_safe(intf_descr, tmp, &nw_descr->nw_intflist,
                                 intf_on_network) {
-               if (intf_descr->cpt_expr != NULL)
-                       cfs_expr_list_free(intf_descr->cpt_expr);
-               free(intf_descr);
+               list_del(&intf_descr->intf_on_network);
+               free_intf_descr(intf_descr);
        }
 
        return rc;
@@ -369,7 +444,7 @@ static lnet_nid_t *allocate_create_nid_array(char **nids, __u32 num_nids,
        lnet_nid_t *array = NULL;
        __u32 i;
 
-       if (!nids) {
+       if (!nids || num_nids == 0) {
                snprintf(err_str, LNET_MAX_STR_LEN, "no NIDs to add");
                return NULL;
        }
@@ -394,13 +469,13 @@ static lnet_nid_t *allocate_create_nid_array(char **nids, __u32 num_nids,
        return array;
 }
 
-static int dispatch_peer_ni_cmd(lnet_nid_t knid, lnet_nid_t nid, __u32 cmd,
+static int dispatch_peer_ni_cmd(lnet_nid_t pnid, lnet_nid_t nid, __u32 cmd,
                                struct lnet_ioctl_peer_cfg *data,
                                char *err_str, char *cmd_str)
 {
        int rc;
 
-       data->prcfg_key_nid = knid;
+       data->prcfg_prim_nid = pnid;
        data->prcfg_cfg_nid = nid;
 
        rc = l_ioctl(LNET_DEV_ID, cmd, data);
@@ -415,23 +490,215 @@ static int dispatch_peer_ni_cmd(lnet_nid_t knid, lnet_nid_t nid, __u32 cmd,
        return rc;
 }
 
-int lustre_lnet_config_peer_nid(char *knid, char **nid, int num_nids,
+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;
+       lnet_process_id_t 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(lnet_process_id_t) * 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)
 {
        struct lnet_ioctl_peer_cfg data;
-       lnet_nid_t key_nid = LNET_NID_ANY;
+       lnet_nid_t prim_nid = LNET_NID_ANY;
        int rc = LUSTRE_CFG_RC_NO_ERR;
        int idx = 0;
        bool nid0_used = false;
        char err_str[LNET_MAX_STR_LEN] = {0};
        lnet_nid_t *nids = allocate_create_nid_array(nid, num_nids, err_str);
 
-       if (knid) {
-               key_nid = libcfs_str2nid(knid);
-               if (key_nid == LNET_NID_ANY) {
+       if (pnid) {
+               prim_nid = libcfs_str2nid(pnid);
+               if (prim_nid == LNET_NID_ANY) {
                        snprintf(err_str, sizeof(err_str),
                                 "bad key NID: '%s'",
-                                knid);
+                                pnid);
                        rc = LUSTRE_CFG_RC_MISSING_PARAM;
                        goto out;
                }
@@ -441,7 +708,7 @@ int lustre_lnet_config_peer_nid(char *knid, char **nid, int num_nids,
                rc = LUSTRE_CFG_RC_MISSING_PARAM;
                goto out;
        } else {
-               key_nid = LNET_NID_ANY;
+               prim_nid = LNET_NID_ANY;
        }
 
        snprintf(err_str, sizeof(err_str), "\"Success\"");
@@ -450,17 +717,17 @@ int lustre_lnet_config_peer_nid(char *knid, char **nid, int num_nids,
        data.prcfg_mr = mr;
 
        /*
-        * if key_nid is not specified use the first nid in the list of
-        * nids provided as the key_nid. NOTE: on entering 'if' we must
+        * if prim_nid is not specified use the first nid in the list of
+        * nids provided as the prim_nid. NOTE: on entering 'if' we must
         * have at least 1 NID
         */
-       if (key_nid == LNET_NID_ANY) {
+       if (prim_nid == LNET_NID_ANY) {
                nid0_used = true;
-               key_nid = nids[0];
+               prim_nid = nids[0];
        }
 
-       /* Create the key_nid first */
-       rc = dispatch_peer_ni_cmd(key_nid, LNET_NID_ANY,
+       /* Create the prim_nid first */
+       rc = dispatch_peer_ni_cmd(prim_nid, LNET_NID_ANY,
                                  IOC_LIBCFS_ADD_PEER_NI,
                                  &data, err_str, "add");
 
@@ -470,12 +737,12 @@ int lustre_lnet_config_peer_nid(char *knid, char **nid, int num_nids,
        /* add the rest of the nids to the key nid if any are available */
        for (idx = nid0_used ? 1 : 0 ; nids && idx < num_nids; idx++) {
                /*
-                * If key_nid is not provided then the first nid in the
-                * list becomes the key_nid. First time round the loop use
+                * If prim_nid is not provided then the first nid in the
+                * list becomes the prim_nid. First time round the loop use
                 * LNET_NID_ANY for the first parameter, then use nid[0]
                 * as the key nid after wards
                 */
-               rc = dispatch_peer_ni_cmd(key_nid, nids[idx],
+               rc = dispatch_peer_ni_cmd(prim_nid, nids[idx],
                                          IOC_LIBCFS_ADD_PEER_NI, &data,
                                          err_str, "add");
 
@@ -490,28 +757,28 @@ out:
        return rc;
 }
 
-int lustre_lnet_del_peer_nid(char *knid, char **nid, int num_nids,
+int lustre_lnet_del_peer_nid(char *pnid, char **nid, int num_nids,
                             int seq_no, struct cYAML **err_rc)
 {
        struct lnet_ioctl_peer_cfg data;
-       lnet_nid_t key_nid;
+       lnet_nid_t prim_nid;
        int rc = LUSTRE_CFG_RC_NO_ERR;
        int idx = 0;
        char err_str[LNET_MAX_STR_LEN] = {0};
        lnet_nid_t *nids = allocate_create_nid_array(nid, num_nids, err_str);
 
-       if (knid == NULL) {
+       if (pnid == NULL) {
                snprintf(err_str, sizeof(err_str),
                         "\"Primary nid is not provided\"");
                rc = LUSTRE_CFG_RC_MISSING_PARAM;
                goto out;
        } else {
-               key_nid = libcfs_str2nid(knid);
-               if (key_nid == LNET_NID_ANY) {
+               prim_nid = libcfs_str2nid(pnid);
+               if (prim_nid == LNET_NID_ANY) {
                        rc = LUSTRE_CFG_RC_BAD_PARAM;
                        snprintf(err_str, sizeof(err_str),
                                 "bad key NID: '%s'",
-                                knid);
+                                pnid);
                        goto out;
                }
        }
@@ -520,14 +787,14 @@ int lustre_lnet_del_peer_nid(char *knid, char **nid, int num_nids,
 
        LIBCFS_IOC_INIT_V2(data, prcfg_hdr);
        if (!nids || nids[0] == LNET_NID_ANY) {
-               rc = dispatch_peer_ni_cmd(key_nid, LNET_NID_ANY,
+               rc = dispatch_peer_ni_cmd(prim_nid, LNET_NID_ANY,
                                          IOC_LIBCFS_DEL_PEER_NI,
                                          &data, err_str, "del");
                goto out;
        }
 
        for (idx = 0; nids && idx < num_nids; idx++) {
-               rc = dispatch_peer_ni_cmd(key_nid, nids[idx],
+               rc = dispatch_peer_ni_cmd(prim_nid, nids[idx],
                                          IOC_LIBCFS_DEL_PEER_NI, &data,
                                          err_str, "del");
 
@@ -572,17 +839,6 @@ int lustre_lnet_config_route(char *nw, char *gw, int hops, int prio,
                goto out;
        }
 
-       if (LNET_NETTYP(net) == CIBLND    ||
-           LNET_NETTYP(net) == OPENIBLND ||
-           LNET_NETTYP(net) == IIBLND    ||
-           LNET_NETTYP(net) == VIBLND) {
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"obselete LNet type '%s'\"", libcfs_lnd2str(net));
-               rc = LUSTRE_CFG_RC_BAD_PARAM;
-               goto out;
-       }
-
        gateway_nid = libcfs_str2nid(gw);
        if (gateway_nid == LNET_NID_ANY) {
                snprintf(err_str,
@@ -666,17 +922,6 @@ int lustre_lnet_del_route(char *nw, char *gw,
                goto out;
        }
 
-       if (LNET_NETTYP(net) == CIBLND    ||
-           LNET_NETTYP(net) == OPENIBLND ||
-           LNET_NETTYP(net) == IIBLND    ||
-           LNET_NETTYP(net) == VIBLND) {
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"obselete LNet type '%s'\"", libcfs_lnd2str(net));
-               rc = LUSTRE_CFG_RC_BAD_PARAM;
-               goto out;
-       }
-
        gateway_nid = libcfs_str2nid(gw);
        if (gateway_nid == LNET_NID_ANY) {
                snprintf(err_str,
@@ -733,17 +978,6 @@ int lustre_lnet_show_route(char *nw, char *gw, int hops, int prio, int detail,
                        goto out;
                }
 
-               if (LNET_NETTYP(net) == CIBLND    ||
-                   LNET_NETTYP(net) == OPENIBLND ||
-                   LNET_NETTYP(net) == IIBLND    ||
-                   LNET_NETTYP(net) == VIBLND) {
-                       snprintf(err_str,
-                                sizeof(err_str),
-                                "\"obsolete LNet type '%s'\"",
-                                libcfs_lnd2str(net));
-                       rc = LUSTRE_CFG_RC_BAD_PARAM;
-                       goto out;
-               }
        } else {
                /* show all routes without filtering on net */
                net = LNET_NIDNET(LNET_NID_ANY);
@@ -828,8 +1062,8 @@ int lustre_lnet_show_route(char *nw, char *gw, int hops, int prio, int detail,
 
                if (detail) {
                        if (cYAML_create_number(item, "hop",
-                                               data.cfg_config_u.cfg_route.
-                                                       rtr_hop) ==
+                                               (int) data.cfg_config_u.
+                                               cfg_route.rtr_hop) ==
                            NULL)
                                goto out;
 
@@ -893,7 +1127,7 @@ out:
 static int socket_intf_query(int request, char *intf,
                             struct ifreq *ifr)
 {
-       int rc;
+       int rc = 0;
        int sockfd;
 
        if (strlen(intf) >= IFNAMSIZ || ifr == NULL)
@@ -906,9 +1140,11 @@ static int socket_intf_query(int request, char *intf,
        strcpy(ifr->ifr_name, intf);
        rc = ioctl(sockfd, request, ifr);
        if (rc != 0)
-               return LUSTRE_CFG_RC_BAD_PARAM;
+               rc = LUSTRE_CFG_RC_BAD_PARAM;
 
-       return 0;
+       close(sockfd);
+
+       return rc;
 }
 
 /*
@@ -996,7 +1232,7 @@ int lustre_lnet_match_ip_to_intf(struct ifaddrs *ifa,
 {
        int rc;
        __u32 ip;
-       struct lnet_dlc_intf_descr *intf_descr;
+       struct lnet_dlc_intf_descr *intf_descr, *tmp;
        struct ifaddrs *ifaddr = ifa;
        struct lustre_lnet_ip_range_descr *ip_range;
        int family;
@@ -1014,7 +1250,8 @@ int lustre_lnet_match_ip_to_intf(struct ifaddrs *ifa,
                                continue;
 
                        family = ifaddr->ifa_addr->sa_family;
-                       if (family == AF_INET) {
+                       if (family == AF_INET &&
+                           strcmp(ifaddr->ifa_name, "lo") != 0) {
                                rc = lustre_lnet_add_intf_descr
                                        (intf_list, ifaddr->ifa_name,
                                        strlen(ifaddr->ifa_name));
@@ -1062,11 +1299,14 @@ int lustre_lnet_match_ip_to_intf(struct ifaddrs *ifa,
 
                                        if (rc != LUSTRE_CFG_RC_NO_ERR)
                                                return rc;
-
-                                       return LUSTRE_CFG_RC_MATCH;
                                }
                        }
                }
+
+               if (!list_empty(intf_list))
+                       return LUSTRE_CFG_RC_MATCH;
+
+               return LUSTRE_CFG_RC_NO_MATCH;
        }
 
        /*
@@ -1077,7 +1317,7 @@ int lustre_lnet_match_ip_to_intf(struct ifaddrs *ifa,
         * If > 1 interfaces all the interfaces must match for the NI to
         * be configured.
         */
-       list_for_each_entry(intf_descr, intf_list, intf_on_network) {
+       list_for_each_entry_safe(intf_descr, tmp, intf_list, intf_on_network) {
                for (ifaddr = ifa; ifaddr != NULL; ifaddr = ifaddr->ifa_next) {
                        if (ifaddr->ifa_addr == NULL)
                                continue;
@@ -1089,20 +1329,31 @@ int lustre_lnet_match_ip_to_intf(struct ifaddrs *ifa,
                                break;
                }
 
-               if (ifaddr == NULL)
-                       return LUSTRE_CFG_RC_NO_MATCH;
+               if (ifaddr == NULL) {
+                       list_del(&intf_descr->intf_on_network);
+                       free_intf_descr(intf_descr);
+                       continue;
+               }
 
-               if ((ifaddr->ifa_flags & IFF_UP) == 0)
-                       return LUSTRE_CFG_RC_NO_MATCH;
+               if ((ifaddr->ifa_flags & IFF_UP) == 0) {
+                       list_del(&intf_descr->intf_on_network);
+                       free_intf_descr(intf_descr);
+                       continue;
+               }
 
                ip = ((struct sockaddr_in *)ifaddr->ifa_addr)->sin_addr.s_addr;
 
+               rc = 1;
                list_for_each_entry(ip_range, ip_ranges, ipr_entry) {
                        rc = cfs_ip_addr_match(bswap_32(ip), &ip_range->ipr_expr);
                        if (rc)
                                break;
-                       else
-                               return LUSTRE_CFG_RC_NO_MATCH;
+               }
+
+               if (!rc) {
+                       /* no match for this interface */
+                       list_del(&intf_descr->intf_on_network);
+                       free_intf_descr(intf_descr);
                }
        }
 
@@ -1156,17 +1407,19 @@ lustre_lnet_ioctl_config_ni(struct list_head *intf_list,
 
        list_for_each_entry(intf_descr, intf_list,
                            intf_on_network) {
-               if (i == 0 && tunables != NULL)
+               if (tunables != NULL)
                        len = sizeof(struct lnet_ioctl_config_ni) +
                              sizeof(struct lnet_ioctl_config_lnd_tunables);
                else
                        len = sizeof(struct lnet_ioctl_config_ni);
 
                data = calloc(1, len);
+               if (!data)
+                       return LUSTRE_CFG_RC_OUT_OF_MEM;
                conf = (struct lnet_ioctl_config_ni*) data;
-               if (i == 0 && tunables != NULL)
+               if (tunables != NULL)
                        tun = (struct lnet_ioctl_config_lnd_tunables*)
-                               (data + sizeof(*conf));
+                               conf->lic_bulk;
 
                LIBCFS_IOC_INIT_V2(*conf, lic_cfg_hdr);
                conf->lic_cfg_hdr.ioc_len = len;
@@ -1198,8 +1451,7 @@ lustre_lnet_ioctl_config_ni(struct list_head *intf_list,
 
                conf->lic_ncpts = count;
 
-               if (i == 0 && tunables != NULL)
-                       /* TODO put in the LND tunables */
+               if (tunables != NULL)
                        memcpy(tun, tunables, sizeof(*tunables));
 
                rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_ADD_LOCAL_NI, data);
@@ -1208,8 +1460,10 @@ lustre_lnet_ioctl_config_ni(struct list_head *intf_list,
                        snprintf(err_str,
                                 LNET_MAX_STR_LEN,
                                 "\"cannot add network: %s\"", strerror(errno));
+                       free(data);
                        return rc;
                }
+               free(data);
                i++;
        }
 
@@ -1229,8 +1483,7 @@ lustre_lnet_config_ip2nets(struct lustre_lnet_ip2nets *ip2nets,
 
        snprintf(err_str, sizeof(err_str), "\"success\"");
 
-       if (ip2nets == NULL ||
-           list_empty(&ip2nets->ip2nets_net.nw_intflist)) {
+       if (!ip2nets) {
                snprintf(err_str,
                         sizeof(err_str),
                         "\"incomplete ip2nets information\"");
@@ -1238,6 +1491,11 @@ lustre_lnet_config_ip2nets(struct lustre_lnet_ip2nets *ip2nets,
                goto out;
        }
 
+       /*
+        * call below function to resolve the rules into a list of nids.
+        * 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,
@@ -1246,11 +1504,18 @@ lustre_lnet_config_ip2nets(struct lustre_lnet_ip2nets *ip2nets,
                goto out;
        }
 
+       if (list_empty(&ip2nets->ip2nets_net.nw_intflist)) {
+               snprintf(err_str, sizeof(err_str),
+                        "\"no interfaces match ip2nets rules\"");
+               goto free_nids_out;
+       }
+
        rc = lustre_lnet_ioctl_config_ni(&ip2nets->ip2nets_net.nw_intflist,
                                         tunables, global_cpts, nids,
                                         err_str);
-       if (rc != LUSTRE_CFG_RC_NO_ERR)
-               free(nids);
+
+free_nids_out:
+       free(nids);
 
 out:
        cYAML_build_error(rc, seq_no, ADD_CMD, "ip2nets", err_str, err_rc);
@@ -1302,6 +1567,10 @@ int lustre_lnet_config_ni(struct lnet_dlc_network_descr *nw_descr,
                else
                        len = sizeof(struct lnet_ioctl_config_ni);
                data = calloc(1, len);
+               if (!data) {
+                       rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+                       goto out;
+               }
                conf = (struct lnet_ioctl_config_ni*) data;
                if (tunables != NULL)
                        tun = (struct lnet_ioctl_config_lnd_tunables*)
@@ -1344,8 +1613,10 @@ int lustre_lnet_config_ni(struct lnet_dlc_network_descr *nw_descr,
                goto out;
        }
 
-       if (LNET_NETTYP(nw_descr->nw_id) == LOLND)
-               return LUSTRE_CFG_RC_NO_ERR;
+       if (LNET_NETTYP(nw_descr->nw_id) == LOLND) {
+               rc = LUSTRE_CFG_RC_NO_ERR;
+               goto out;
+       }
 
        if (nw_descr->nw_id == LNET_NIDNET(LNET_NID_ANY)) {
                snprintf(err_str,
@@ -1381,9 +1652,8 @@ out:
                list_for_each_entry_safe(intf_descr, tmp,
                                         &nw_descr->nw_intflist,
                                         intf_on_network) {
-                       if (intf_descr->cpt_expr != NULL)
-                               cfs_expr_list_free(intf_descr->cpt_expr);
-                       free(intf_descr);
+                       list_del(&intf_descr->intf_on_network);
+                       free_intf_descr(intf_descr);
                }
        }
 
@@ -1408,9 +1678,6 @@ int lustre_lnet_del_ni(struct lnet_dlc_network_descr *nw_descr,
        __u32 nnids = 0;
        struct lnet_dlc_intf_descr *intf_descr, *tmp;
 
-       if (LNET_NETTYP(nw_descr->nw_id) == LOLND)
-               return LUSTRE_CFG_RC_NO_ERR;
-
        snprintf(err_str, sizeof(err_str), "\"success\"");
 
        if (nw_descr == NULL) {
@@ -1421,6 +1688,9 @@ int lustre_lnet_del_ni(struct lnet_dlc_network_descr *nw_descr,
                goto out;
        }
 
+       if (LNET_NETTYP(nw_descr->nw_id) == LOLND)
+               return LUSTRE_CFG_RC_NO_ERR;
+
        if (nw_descr->nw_id == LNET_NIDNET(LNET_NID_ANY)) {
                snprintf(err_str,
                         sizeof(err_str),
@@ -1468,9 +1738,8 @@ int lustre_lnet_del_ni(struct lnet_dlc_network_descr *nw_descr,
 
        list_for_each_entry_safe(intf_descr, tmp, &nw_descr->nw_intflist,
                                 intf_on_network) {
-               if (intf_descr->cpt_expr != NULL)
-                       cfs_expr_list_free(intf_descr->cpt_expr);
-               free(intf_descr);
+               list_del(&intf_descr->intf_on_network);
+               free_intf_descr(intf_descr);
        }
 
 out:
@@ -1482,6 +1751,47 @@ 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)
 {
@@ -1489,6 +1799,7 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
        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;
@@ -1610,7 +1921,7 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
                        if (interfaces == NULL)
                                goto out;
 
-                       for (j = 0; j < LNET_MAX_INTERFACES; j++) {
+                       for (j = 0; j < LNET_INTERFACES_NUM; j++) {
                                if (strlen(ni_data->lic_ni_intf[j]) > 0) {
                                        snprintf(str_buf,
                                                 sizeof(str_buf), "%d", j);
@@ -1625,26 +1936,61 @@ int lustre_lnet_show_net(char *nw, int detail, int seq_no,
 
                if (detail) {
                        char *limit;
+                       int k;
 
                        statistics = cYAML_create_object(item, "statistics");
                        if (statistics == NULL)
                                goto out;
 
                        if (cYAML_create_number(statistics, "send_count",
-                                               stats->send_count)
+                                               stats->iel_send_count)
                                                        == NULL)
                                goto out;
 
                        if (cYAML_create_number(statistics, "recv_count",
-                                               stats->recv_count)
+                                               stats->iel_recv_count)
                                                        == NULL)
                                goto out;
 
                        if (cYAML_create_number(statistics, "drop_count",
-                                               stats->drop_count)
+                                               stats->iel_drop_count)
                                                        == 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;
@@ -1764,69 +2110,112 @@ 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_buffers(int tiny, int small, int large, int seq_no,
-                              struct cYAML **err_rc)
+int lustre_lnet_config_max_intf(int max, int seq_no, struct cYAML **err_rc)
 {
-       struct lnet_ioctl_config_data data;
        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\"");
 
-       /* -1 indicates to ignore changes to this field */
-       if (tiny < -1 || small < -1 || large < -1) {
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"tiny, small and large must be >= 0\"");
-               rc = LUSTRE_CFG_RC_OUT_OF_RANGE_PARAM;
-               goto out;
-       }
+       snprintf(val, sizeof(val), "%d", max);
 
-       LIBCFS_IOC_INIT_V2(data, cfg_hdr);
-       data.cfg_config_u.cfg_buffers.buf_tiny = tiny;
-       data.cfg_config_u.cfg_buffers.buf_small = small;
-       data.cfg_config_u.cfg_buffers.buf_large = large;
+       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));
 
-       rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_ADD_BUF, &data);
-       if (rc != 0) {
-               rc = -errno;
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"cannot configure buffers: %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,
+                              struct cYAML **err_rc)
+{
+       struct lnet_ioctl_config_data data;
+       int rc = LUSTRE_CFG_RC_NO_ERR;
+       char err_str[LNET_MAX_STR_LEN];
+
+       snprintf(err_str, sizeof(err_str), "\"success\"");
+
+       /* -1 indicates to ignore changes to this field */
+       if (tiny < -1 || small < -1 || large < -1) {
+               snprintf(err_str,
+                        sizeof(err_str),
+                        "\"tiny, small and large must be >= 0\"");
+               rc = LUSTRE_CFG_RC_OUT_OF_RANGE_PARAM;
+               goto out;
+       }
+
+       LIBCFS_IOC_INIT_V2(data, cfg_hdr);
+       data.cfg_config_u.cfg_buffers.buf_tiny = tiny;
+       data.cfg_config_u.cfg_buffers.buf_small = small;
+       data.cfg_config_u.cfg_buffers.buf_large = large;
+
+       rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_ADD_BUF, &data);
+       if (rc != 0) {
+               rc = -errno;
+               snprintf(err_str,
+                        sizeof(err_str),
+                        "\"cannot configure buffers: %s\"", strerror(errno));
                goto out;
        }
 
@@ -1992,28 +2381,31 @@ out:
 int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
                          struct cYAML **show_rc, struct cYAML **err_rc)
 {
-       struct lnet_ioctl_peer_cfg *peer_info;
+       /*
+        * TODO: This function is changing in a future patch to accommodate
+        * PEER_LIST and proper filtering on any nid of the peer
+        */
+       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(*peer_info) + sizeof(*lpni_cri) +
-                       sizeof(*lpni_stats);
-       char *data = calloc(data_size, 1);
-       bool new_peer = true;
+       lnet_process_id_t *list = NULL;
+       void *data = NULL;
+       void *lpni_data;
 
        snprintf(err_str, sizeof(err_str),
                 "\"out of memory\"");
 
-       if (data == NULL)
-               goto out;
-
-       peer_info = (struct lnet_ioctl_peer_cfg *)data;
-
        /* create struct cYAML root object */
        root = cYAML_create_object(NULL, NULL);
        if (root == NULL)
@@ -2023,68 +2415,122 @@ 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);
+       count = 1000;
+       size = count * sizeof(lnet_process_id_t);
+       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_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;
+                       }
+               }
+       }
 
-       do {
-               for (i = 0;; i++) {
-                       memset(data, 0, data_size);
-                       LIBCFS_IOC_INIT_V2(*peer_info, prcfg_hdr);
-                       peer_info->prcfg_hdr.ioc_len = data_size;
-                       peer_info->prcfg_idx = i;
+       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;
 
-                       rc = l_ioctl(LNET_DEV_ID,
-                                    IOC_LIBCFS_GET_PEER_NI, peer_info);
-                       if (rc != 0) {
-                               l_errno = errno;
+                       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_key_nid)
-                                       continue;
-
-                       lpni_cri = (struct lnet_peer_ni_credit_info*)peer_info->prcfg_bulk;
-                       lpni_stats = (struct lnet_ioctl_element_stats *)
-                                    (peer_info->prcfg_bulk +
-                                    sizeof(*lpni_cri));
+               peer = cYAML_create_seq_item(peer_root);
+               if (peer == NULL)
+                       goto out;
 
-                       peer = cYAML_create_seq_item(peer_root);
-                       if (peer == NULL)
-                               goto out;
+               if (first_seq == NULL)
+                       first_seq = peer;
 
-                       if (peer_info->prcfg_key_nid != prev_primary_nid) {
-                               prev_primary_nid = peer_info->prcfg_key_nid;
-                               new_peer = true;
-                       }
+               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;
 
-                       if (new_peer) {
-                               lnet_nid_t pnid = peer_info->prcfg_key_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;
 
@@ -2106,6 +2552,16 @@ int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
                            == NULL)
                                goto out;
 
+                       if (cYAML_create_number(peer_ni, "min_tx_credits",
+                                               lpni_cri->cr_peer_min_tx_credits)
+                           == NULL)
+                               goto out;
+
+                       if (cYAML_create_number(peer_ni, "tx_q_num_of_buf",
+                                               lpni_cri->cr_peer_tx_qnob)
+                           == NULL)
+                               goto out;
+
                        if (cYAML_create_number(peer_ni, "available_rtr_credits",
                                                lpni_cri->cr_peer_rtr_credits)
                            == NULL)
@@ -2116,42 +2572,162 @@ int lustre_lnet_show_peer(char *knid, int detail, int seq_no,
                            == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "tx_q_num_of_buf",
-                                               lpni_cri->cr_peer_tx_qnob)
-                           == NULL)
+                       if (cYAML_create_number(peer_ni, "refcount",
+                                               lpni_cri->cr_refcount) == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "send_count",
-                                               lpni_stats->send_count)
-                           == NULL)
+                       statistics = cYAML_create_object(peer_ni, "statistics");
+                       if (statistics == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "recv_count",
-                                               lpni_stats->recv_count)
+                       if (cYAML_create_number(statistics, "send_count",
+                                               lpni_stats->iel_send_count)
                            == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "drop_count",
-                                               lpni_stats->drop_count)
+                       if (cYAML_create_number(statistics, "recv_count",
+                                               lpni_stats->iel_recv_count)
                            == NULL)
                                goto out;
 
-                       if (cYAML_create_number(peer_ni, "refcount",
-                                               lpni_cri->cr_refcount) == NULL)
+                       if (cYAML_create_number(statistics, "drop_count",
+                                               lpni_stats->iel_drop_count)
+                           == 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;
+                       }
+
+               }
+       }
+
+       /* 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;
+       }
 
-               if (l_errno != ENOENT) {
+       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];
+       lnet_process_id_t *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(lnet_process_id_t);
+       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)
@@ -2161,6 +2737,8 @@ 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) {
@@ -2172,11 +2750,11 @@ 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);
@@ -2191,27 +2769,31 @@ 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 = LUSTRE_CFG_RC_OUT_OF_MEM;
-       int l_errno;
-       char err_str[LNET_MAX_STR_LEN];
-       struct cYAML *root = NULL, *range = NULL;
-
-       snprintf(err_str, sizeof(err_str), "\"out of memory\"");
+       struct cYAML *show_node;
+
+       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;
        }
 
@@ -2219,39 +2801,128 @@ int lustre_lnet_show_numa_range(int seq_no, struct cYAML **show_rc,
        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)
 {
        struct lnet_ioctl_lnet_stats data;
-       int rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+       int rc;
        int l_errno;
        char err_str[LNET_MAX_STR_LEN];
        struct cYAML *root = NULL, *stats = NULL;
@@ -2271,6 +2942,8 @@ int lustre_lnet_show_stats(int seq_no, struct cYAML **show_rc,
                goto out;
        }
 
+       rc = LUSTRE_CFG_RC_OUT_OF_MEM;
+
        root = cYAML_create_object(NULL, NULL);
        if (root == NULL)
                goto out;
@@ -2327,6 +3000,7 @@ int lustre_lnet_show_stats(int seq_no, struct cYAML **show_rc,
                cYAML_print_tree(root);
 
        snprintf(err_str, sizeof(err_str), "\"success\"");
+       rc = LUSTRE_CFG_RC_NO_ERR;
 out:
        if (show_rc == NULL || rc != LUSTRE_CFG_RC_NO_ERR) {
                cYAML_free_tree(root);
@@ -2424,9 +3098,8 @@ static int yaml_copy_intf_info(struct cYAML *intf_tree,
 failed:
        list_for_each_entry_safe(intf_descr, tmp, &nw_descr->nw_intflist,
                                 intf_on_network) {
-               if (intf_descr->cpt_expr != NULL)
-                       cfs_expr_list_free(intf_descr->cpt_expr);
-               free(intf_descr);
+               list_del(&intf_descr->intf_on_network);
+               free_intf_descr(intf_descr);
        }
 
        return rc;
@@ -2435,10 +3108,10 @@ failed:
 static bool
 yaml_extract_cmn_tunables(struct cYAML *tree,
                          struct lnet_ioctl_config_lnd_cmn_tunables *tunables,
-                         int *num_global_cpts,
                          struct cfs_expr_list **global_cpts)
 {
        struct cYAML *tun, *item, *smp;
+       int rc;
 
        tun = cYAML_get_object_item(tree, "tunables");
        if (tun != NULL) {
@@ -2456,10 +3129,11 @@ yaml_extract_cmn_tunables(struct cYAML *tree,
                        tunables->lct_max_tx_credits = item->cy_valueint;
                smp = cYAML_get_object_item(tun, "CPT");
                if (smp != NULL) {
-                       *num_global_cpts =
-                               cfs_expr_list_parse(smp->cy_valuestring,
+                       rc = cfs_expr_list_parse(smp->cy_valuestring,
                                                 strlen(smp->cy_valuestring),
                                                 0, UINT_MAX, global_cpts);
+                       if (rc != 0)
+                               *global_cpts = NULL;
                }
 
                return true;
@@ -2471,14 +3145,13 @@ yaml_extract_cmn_tunables(struct cYAML *tree,
 static bool
 yaml_extract_tunables(struct cYAML *tree,
                      struct lnet_ioctl_config_lnd_tunables *tunables,
-                     int *num_global_cpts,
                      struct cfs_expr_list **global_cpts,
                      __u32 net_type)
 {
        bool rc;
 
        rc = yaml_extract_cmn_tunables(tree, &tunables->lt_cmn,
-                                      num_global_cpts, global_cpts);
+                                      global_cpts);
 
        if (!rc)
                return rc;
@@ -2519,7 +3192,7 @@ static int handle_yaml_config_ni(struct cYAML *tree, struct cYAML **show_rc,
 {
        struct cYAML *net, *intf, *seq_no, *ip2net = NULL, *local_nis = NULL,
                     *item = NULL;
-       int num_entries = 0, num_global_cpts = 0, rc;
+       int num_entries = 0, rc;
        struct lnet_dlc_network_descr nw_descr;
        struct cfs_expr_list *global_cpts = NULL;
        struct lnet_ioctl_config_lnd_tunables tunables;
@@ -2534,6 +3207,8 @@ static int handle_yaml_config_ni(struct cYAML *tree, struct cYAML **show_rc,
        net = cYAML_get_object_item(tree, "net type");
        if (net)
                nw_descr.nw_id = libcfs_str2net(net->cy_valuestring);
+       else
+               nw_descr.nw_id = LOLND;
 
        /*
         * if neither net nor ip2nets are present, then we can not
@@ -2562,13 +3237,12 @@ static int handle_yaml_config_ni(struct cYAML *tree, struct cYAML **show_rc,
                }
        }
 
-       found = yaml_extract_tunables(tree, &tunables, &num_global_cpts,
-                                     &global_cpts,
+       found = yaml_extract_tunables(tree, &tunables, &global_cpts,
                                      LNET_NETTYP(nw_descr.nw_id));
        seq_no = cYAML_get_object_item(tree, "seq_no");
 
        rc = lustre_lnet_config_ni(&nw_descr,
-                                  (num_global_cpts > 0) ? global_cpts: NULL,
+                                  global_cpts,
                                   (ip2net) ? ip2net->cy_valuestring : NULL,
                                   (found) ? &tunables: NULL,
                                   (seq_no) ? seq_no->cy_valueint : -1,
@@ -2599,7 +3273,7 @@ static int handle_yaml_config_ip2nets(struct cYAML *tree,
        struct lustre_lnet_ip2nets ip2nets;
        struct lustre_lnet_ip_range_descr *ip_range_descr = NULL,
                                          *tmp = NULL;
-       int rc = LUSTRE_CFG_RC_NO_ERR, num_global_cpts = 0;
+       int rc = LUSTRE_CFG_RC_NO_ERR;
        struct cfs_expr_list *global_cpts = NULL;
        struct cfs_expr_list *el, *el_tmp;
        struct lnet_ioctl_config_lnd_tunables tunables;
@@ -2653,13 +3327,12 @@ static int handle_yaml_config_ip2nets(struct cYAML *tree,
                }
        }
 
-       found = yaml_extract_tunables(tree, &tunables, &num_global_cpts,
-                                     &global_cpts,
+       found = yaml_extract_tunables(tree, &tunables, &global_cpts,
                                      LNET_NETTYP(ip2nets.ip2nets_net.nw_id));
 
        rc = lustre_lnet_config_ip2nets(&ip2nets,
                        (found) ? &tunables : NULL,
-                       (num_global_cpts > 0) ? global_cpts : NULL,
+                       global_cpts,
                        (seq_no) ? seq_no->cy_valueint : -1,
                        err_rc);
 
@@ -2673,17 +3346,19 @@ out:
        list_for_each_entry_safe(intf_descr, intf_tmp,
                                 &ip2nets.ip2nets_net.nw_intflist,
                                 intf_on_network) {
-               if (intf_descr->cpt_expr != NULL)
-                       cfs_expr_list_free(intf_descr->cpt_expr);
-               free(intf_descr);
+               list_del(&intf_descr->intf_on_network);
+               free_intf_descr(intf_descr);
        }
 
        list_for_each_entry_safe(ip_range_descr, tmp,
                                 &ip2nets.ip2nets_ip_ranges,
                                 ipr_entry) {
+               list_del(&ip_range_descr->ipr_entry);
                list_for_each_entry_safe(el, el_tmp, &ip_range_descr->ipr_expr,
-                                        el_link)
+                                        el_link) {
+                       list_del(&el->el_link);
                        cfs_expr_list_free(el);
+               }
                free(ip_range_descr);
        }
 
@@ -2734,16 +3409,38 @@ static int handle_yaml_del_ni(struct cYAML *tree, struct cYAML **show_rc,
        return rc;
 }
 
-static int yaml_copy_peer_nids(struct cYAML *tree, char ***nidsppp)
+static int yaml_copy_peer_nids(struct cYAML *tree, char ***nidsppp, bool del)
 {
-       struct cYAML *nids_entry = NULL, *child = NULL, *entry = NULL;
+       struct cYAML *nids_entry = NULL, *child = NULL, *entry = NULL,
+                    *prim_nid = NULL;
        char **nids = NULL;
        int num = 0, rc = LUSTRE_CFG_RC_NO_ERR;
 
+       prim_nid = cYAML_get_object_item(tree, "primary nid");
+       if (!prim_nid || !prim_nid->cy_valuestring)
+               return LUSTRE_CFG_RC_MISSING_PARAM;
+
        nids_entry = cYAML_get_object_item(tree, "peer ni");
        if (cYAML_is_sequence(nids_entry)) {
-               while (cYAML_get_next_seq_item(nids_entry, &child))
+               while (cYAML_get_next_seq_item(nids_entry, &child)) {
+                       entry = cYAML_get_object_item(child, "nid");
+                       /* don't count an empty entry */
+                       if (!entry || !entry->cy_valuestring)
+                               continue;
+
+                       if ((strcmp(entry->cy_valuestring, prim_nid->cy_valuestring)
+                                       == 0) && del) {
+                               /*
+                                * primary nid is present in the list of
+                                * nids so that means we want to delete
+                                * the entire peer, so no need to go
+                                * further. Just delete the entire peer.
+                                */
+                               return 0;
+                       }
+
                        num++;
+               }
        }
 
        if (num == 0)
@@ -2758,8 +3455,9 @@ static int yaml_copy_peer_nids(struct cYAML *tree, char ***nidsppp)
        child = NULL;
        while (cYAML_get_next_seq_item(nids_entry, &child)) {
                entry = cYAML_get_object_item(child, "nid");
-               if (!entry)
+               if (!entry || !entry->cy_valuestring)
                        continue;
+
                nids[num] = calloc(strlen(entry->cy_valuestring) + 1, 1);
                if (!nids[num]) {
                        rc = LUSTRE_CFG_RC_OUT_OF_MEM;
@@ -2786,17 +3484,17 @@ static int handle_yaml_config_peer(struct cYAML *tree, struct cYAML **show_rc,
 {
        char **nids = NULL;
        int num, rc;
-       struct cYAML *seq_no, *key_nid, *non_mr;
+       struct cYAML *seq_no, *prim_nid, *non_mr;
 
-       num = yaml_copy_peer_nids(tree, &nids);
+       num = yaml_copy_peer_nids(tree, &nids, false);
        if (num < 0)
                return num;
 
        seq_no = cYAML_get_object_item(tree, "seq_no");
-       key_nid = cYAML_get_object_item(tree, "primary nid");
+       prim_nid = cYAML_get_object_item(tree, "primary nid");
        non_mr = cYAML_get_object_item(tree, "non_mr");
 
-       rc = lustre_lnet_config_peer_nid((key_nid) ? key_nid->cy_valuestring : NULL,
+       rc = lustre_lnet_config_peer_nid((prim_nid) ? prim_nid->cy_valuestring : NULL,
                                         nids, num,
                                         (non_mr) ? false : true,
                                         (seq_no) ? seq_no->cy_valueint : -1,
@@ -2811,16 +3509,16 @@ static int handle_yaml_del_peer(struct cYAML *tree, struct cYAML **show_rc,
 {
        char **nids = NULL;
        int num, rc;
-       struct cYAML *seq_no, *key_nid;
+       struct cYAML *seq_no, *prim_nid;
 
-       num = yaml_copy_peer_nids(tree, &nids);
+       num = yaml_copy_peer_nids(tree, &nids, true);
        if (num < 0)
                return num;
 
        seq_no = cYAML_get_object_item(tree, "seq_no");
-       key_nid = cYAML_get_object_item(tree, "primary nid");
+       prim_nid = cYAML_get_object_item(tree, "primary nid");
 
-       rc = lustre_lnet_del_peer_nid((key_nid) ? key_nid->cy_valuestring : NULL,
+       rc = lustre_lnet_del_peer_nid((prim_nid) ? prim_nid->cy_valuestring : NULL,
                                      nids, num,
                                      (seq_no) ? seq_no->cy_valueint : -1,
                                      err_rc);
@@ -2953,16 +3651,16 @@ static int handle_yaml_show_routing(struct cYAML *tree, struct cYAML **show_rc,
                                        show_rc, err_rc);
 }
 
-static int handle_yaml_show_credits(struct cYAML *tree, struct cYAML **show_rc,
-                                   struct cYAML **err_rc)
+static int handle_yaml_show_peers(struct cYAML *tree, struct cYAML **show_rc,
+                                 struct cYAML **err_rc)
 {
-       struct cYAML *seq_no, *key_nid, *detail;
+       struct cYAML *seq_no, *nid, *detail;
 
        seq_no = cYAML_get_object_item(tree, "seq_no");
        detail = cYAML_get_object_item(tree, "detail");
-       key_nid = cYAML_get_object_item(tree, "key_nid");
+       nid = cYAML_get_object_item(tree, "nid");
 
-       return lustre_lnet_show_peer((key_nid) ? key_nid->cy_valuestring : NULL,
+       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);
@@ -2979,39 +3677,133 @@ static int handle_yaml_show_stats(struct cYAML *tree, struct cYAML **show_rc,
                                      show_rc, err_rc);
 }
 
-static int handle_yaml_config_numa(struct cYAML *tree, struct cYAML **show_rc,
-                                 struct cYAML **err_rc)
+static int handle_yaml_config_global_settings(struct cYAML *tree,
+                                             struct cYAML **show_rc,
+                                             struct cYAML **err_rc)
 {
-       struct cYAML *seq_no, *range;
+       struct cYAML *max_intf, *numa, *discovery, *seq_no;
+       int rc = 0;
 
        seq_no = cYAML_get_object_item(tree, "seq_no");
-       range = cYAML_get_object_item(tree, "range");
+       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 lustre_lnet_config_numa_range(range ? range->cy_valueint : -1,
-                                            seq_no ? seq_no->cy_valueint : -1,
-                                            err_rc);
+       return rc;
 }
 
-static int handle_yaml_del_numa(struct cYAML *tree, struct cYAML **show_rc,
-                              struct cYAML **err_rc)
+static int handle_yaml_del_global_settings(struct cYAML *tree,
+                                          struct cYAML **show_rc,
+                                          struct cYAML **err_rc)
 {
-       struct cYAML *seq_no;
+       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 lustre_lnet_config_numa_range(0, seq_no ? seq_no->cy_valueint : -1,
-                                            err_rc);
+       return rc;
 }
 
-static int handle_yaml_show_numa(struct cYAML *tree, struct cYAML **show_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;
+       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_show_numa_range(seq_no ? seq_no->cy_valueint : -1,
-                                          show_rc, err_rc);
+       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 {
@@ -3020,35 +3812,56 @@ struct lookup_cmd_hdlr_tbl {
 };
 
 static struct lookup_cmd_hdlr_tbl lookup_config_tbl[] = {
-       {"route", handle_yaml_config_route},
-       {"net", handle_yaml_config_ni},
-       {"ip2nets", handle_yaml_config_ip2nets},
-       {"peer", handle_yaml_config_peer},
-       {"routing", handle_yaml_config_routing},
-       {"buffers", handle_yaml_config_buffers},
-       {"numa", handle_yaml_config_numa},
-       {NULL, NULL}
-};
+       { .name = "route",      .cb = handle_yaml_config_route },
+       { .name = "net",        .cb = handle_yaml_config_ni },
+       { .name = "ip2nets",    .cb = handle_yaml_config_ip2nets },
+       { .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 = "ping",       .cb = handle_yaml_no_op },
+       { .name = "discover",   .cb = handle_yaml_no_op },
+       { .name = NULL } };
 
 static struct lookup_cmd_hdlr_tbl lookup_del_tbl[] = {
-       {"route", handle_yaml_del_route},
-       {"net", handle_yaml_del_ni},
-       {"peer", handle_yaml_del_peer},
-       {"routing", handle_yaml_del_routing},
-       {"numa", handle_yaml_del_numa},
-       {NULL, NULL}
-};
+       { .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 = "ping",       .cb = handle_yaml_no_op },
+       { .name = "discover",   .cb = handle_yaml_no_op },
+       { .name = NULL } };
 
 static struct lookup_cmd_hdlr_tbl lookup_show_tbl[] = {
-       {"route", handle_yaml_show_route},
-       {"net", handle_yaml_show_net},
-       {"buffers", handle_yaml_show_routing},
-       {"routing", handle_yaml_show_routing},
-       {"credits", handle_yaml_show_credits},
-       {"statistics", handle_yaml_show_stats},
-       {"numa", handle_yaml_show_numa},
-       {NULL, NULL}
-};
+       { .name = "route",      .cb = handle_yaml_show_route },
+       { .name = "net",        .cb = handle_yaml_show_net },
+       { .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 = "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 = "ping",       .cb = handle_yaml_ping },
+       { .name = "discover",   .cb = handle_yaml_discover },
+       { .name = NULL } };
 
 static cmd_handler_t lookup_fn(char *key,
                               struct lookup_cmd_hdlr_tbl *tbl)
@@ -3129,46 +3942,8 @@ int lustre_yaml_show(char *f, struct cYAML **show_rc, struct cYAML **err_rc)
                                     show_rc, err_rc);
 }
 
-int lustre_lnet_send_dbg_task(enum lnet_dbg_task dbg_task,
-                             struct lnet_dbg_task_info *dbg_info,
-                             struct cYAML **show_rc,
-                             struct cYAML **err_rc)
+int lustre_yaml_exec(char *f, struct cYAML **show_rc, struct cYAML **err_rc)
 {
-       struct lnet_ioctl_dbg *dbg;
-       struct lnet_dbg_task_info *info;
-       int rc = LUSTRE_CFG_RC_NO_ERR;
-       char err_str[LNET_MAX_STR_LEN];
-
-       snprintf(err_str, sizeof(err_str), "\"success\"");
-
-       dbg = calloc(1, sizeof(*dbg) + sizeof(*info));
-       if (!dbg) {
-               snprintf(err_str, sizeof(err_str), "\"out of memory\"");
-               rc = LUSTRE_CFG_RC_OUT_OF_MEM;
-               goto out;
-       }
-
-       info = (struct lnet_dbg_task_info *)dbg->dbg_bulk;
-
-       LIBCFS_IOC_INIT_V2(*dbg, dbg_hdr);
-
-       dbg->dbg_task = dbg_task;
-       if (dbg_info)
-               memcpy(info, dbg_info, sizeof(*info));
-
-       rc = l_ioctl(LNET_DEV_ID, IOC_LIBCFS_DBG, dbg);
-       if (rc != 0) {
-               rc = -errno;
-               snprintf(err_str,
-                        sizeof(err_str),
-                        "\"debug task failed %s\"", strerror(errno));
-               goto out;
-       }
-
-out:
-       cYAML_build_error(rc, -1, DBG_CMD,
-                        "debug", err_str, err_rc);
-
-       return rc;
+       return lustre_yaml_cb_helper(f, lookup_exec_tbl,
+                                    show_rc, err_rc);
 }
-