[PATCH] libxl: update nic list API to use common device API style

[Roger Pau Monne <roger.pau@entel.upc.edu>]

libxl_device_nic_list returns an array of libxl_device_nic and
libxl_device_nic_getinfo retrieves further information.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Roger Pau Monne <roger.pau@entel.upc.edu>

diff -r 25db0629e338 -r e94763a6bd34 tools/libxl/Makefile
--- a/tools/libxl/Makefile	Fri Sep 30 14:27:27 2011 +0100
+++ b/tools/libxl/Makefile	Fri Sep 30 14:27:27 2011 +0100
@@ -119,7 +119,7 @@ libxlutil.a: $(LIBXLU_OBJS)
 	$(AR) rcs libxlutil.a $^
 
 xl: $(XL_OBJS) libxlutil.so libxenlight.so
-	$(CC) $(LDFLAGS) -o $@ $(XL_OBJS) libxlutil.so $(LDLIBS_libxenlight) $(LDLIBS_libxenctrl)
+	$(CC) $(LDFLAGS) -o $@ $(XL_OBJS) libxlutil.so libxenlight.so $(LDLIBS_libxenlight) $(LDLIBS_libxenctrl)
 
 testidl: testidl.o libxlutil.so libxenlight.so
 	$(CC) $(LDFLAGS) -o $@ testidl.o libxlutil.so $(LDLIBS_libxenlight) $(LDLIBS_libxenctrl)
diff -r 25db0629e338 -r e94763a6bd34 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c	Fri Sep 30 14:27:27 2011 +0100
+++ b/tools/libxl/libxl.c	Fri Sep 30 14:27:27 2011 +0100
@@ -1285,60 +1285,138 @@ int libxl_device_nic_del(libxl_ctx *ctx,
     return rc;
 }
 
-libxl_nicinfo *libxl_list_nics(libxl_ctx *ctx, uint32_t domid, unsigned int *nb)
+static void libxl__device_nic_from_xs_be(libxl__gc *gc,
+                                         const char *be_path,
+                                         libxl_device_nic *nic)
+{
+    libxl_ctx *ctx = libxl__gc_owner(gc);
+    unsigned int len;
+    char *tmp;
+    int rc;
+
+    memset(nic, 0, sizeof(*nic));
+
+    tmp = xs_read(ctx->xsh, XBT_NULL,
+                  libxl__sprintf(gc, "%s/handle", be_path), &len);
+    if ( tmp )
+        nic->devid = atoi(tmp);
+    else
+        nic->devid = 0;
+
+    /* nic->mtu = */
+
+    tmp = xs_read(ctx->xsh, XBT_NULL,
+                  libxl__sprintf(gc, "%s/mac", be_path), &len);
+    rc = libxl__parse_mac(tmp, nic->mac);
+    if (rc)
+            memset(nic->mac, 0, sizeof(nic->mac));
+
+    nic->ip = xs_read(ctx->xsh, XBT_NULL,
+                      libxl__sprintf(gc, "%s/ip", be_path), &len);
+
+    nic->bridge = xs_read(ctx->xsh, XBT_NULL,
+                      libxl__sprintf(gc, "%s/bridge", be_path), &len);
+
+    nic->script = xs_read(ctx->xsh, XBT_NULL,
+                      libxl__sprintf(gc, "%s/script", be_path), &len);
+
+    /* XXX ioemu nics are not in xenstore at all? */
+    nic->nictype = LIBXL_NIC_TYPE_VIF;
+    nic->model = NULL; /* XXX Only for TYPE_IOEMU */
+    nic->ifname = NULL; /* XXX Only for TYPE_IOEMU */
+}
+
+static int libxl__append_nic_list_of_type(libxl__gc *gc,
+                                           uint32_t domid,
+                                           const char *type,
+                                           libxl_device_nic **nics,
+                                           int *nnics)
+{
+    char *be_path = NULL;
+    char **dir = NULL;
+    unsigned int n = 0;
+    libxl_device_nic *pnic = NULL, *pnic_end = NULL;
+
+    be_path = libxl__sprintf(gc, "%s/backend/%s/%d",
+                             libxl__xs_get_dompath(gc, 0), type, domid);
+    dir = libxl__xs_directory(gc, XBT_NULL, be_path, &n);
+    if (dir) {
+        libxl_device_nic *tmp;
+        tmp = realloc(*nics, sizeof (libxl_device_nic) * (*nnics + n));
+        if (tmp == NULL)
+            return ERROR_NOMEM;
+        *nics = tmp;
+        pnic = *nics + *nnics;
+        *nnics += n;
+        pnic_end = *nics + *nnics;
+        for (; pnic < pnic_end; pnic++, dir++) {
+            const char *p;
+            p = libxl__sprintf(gc, "%s/%s", be_path, *dir);
+            libxl__device_nic_from_xs_be(gc, p, pnic);
+            pnic->backend_domid = 0;
+        }
+    }
+    return 0;
+}
+
+libxl_device_nic *libxl_device_nic_list(libxl_ctx *ctx, uint32_t domid, int *num)
 {
     libxl__gc gc = LIBXL_INIT_GC(ctx);
-    char *dompath, *nic_path_fe;
-    char **l, **list;
-    char *val, *tok;
-    unsigned int nb_nics, i;
-    libxl_nicinfo *res, *nics;
+    libxl_device_nic *nics = NULL;
+    int rc;
+
+    *num = 0;
+
+    rc = libxl__append_nic_list_of_type(&gc, domid, "vif", &nics, num);
+    if (rc) goto out_err;
+
+    libxl__free_all(&gc);
+    return nics;
+
+out_err:
+    LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "Unable to list nics");
+    while (*num) {
+        (*num)--;
+        libxl_device_nic_destroy(&nics[*num]);
+    }
+    free(nics);
+    return NULL;
+}
+
+int libxl_device_nic_getinfo(libxl_ctx *ctx, uint32_t domid,
+                              libxl_device_nic *nic, libxl_nicinfo *nicinfo)
+{
+    libxl__gc gc = LIBXL_INIT_GC(ctx);
+    char *dompath, *nicpath;
+    char *val;
 
     dompath = libxl__xs_get_dompath(&gc, domid);
-    if (!dompath)
-        goto err;
-    list = l = libxl__xs_directory(&gc, XBT_NULL,
-                           libxl__sprintf(&gc, "%s/device/vif", dompath), &nb_nics);
-    if (!l)
-        goto err;
-    nics = res = calloc(nb_nics, sizeof (libxl_nicinfo));
-    if (!res)
-        goto err;
-    for (*nb = nb_nics; nb_nics > 0; --nb_nics, ++l, ++nics) {
-        nic_path_fe = libxl__sprintf(&gc, "%s/device/vif/%s", dompath, *l);
-
-        nics->backend = xs_read(ctx->xsh, XBT_NULL,
-                                libxl__sprintf(&gc, "%s/backend", nic_path_fe), NULL);
-        val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/backend-id", nic_path_fe));
-        nics->backend_id = val ? strtoul(val, NULL, 10) : -1;
-
-        nics->devid = strtoul(*l, NULL, 10);
-        val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/state", nic_path_fe));
-        nics->state = val ? strtoul(val, NULL, 10) : -1;
-        val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/mac", nic_path_fe));
-        for (i = 0, tok = strtok(val, ":"); tok && (i < 6);
-             ++i, tok = strtok(NULL, ":")) {
-            nics->mac[i] = strtoul(tok, NULL, 16);
-        }
-        val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/event-channel", nic_path_fe));
-        nics->evtch = val ? strtol(val, NULL, 10) : -1;
-        val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/tx-ring-ref", nic_path_fe));
-        nics->rref_tx = val ? strtol(val, NULL, 10) : -1;
-        val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/rx-ring-ref", nic_path_fe));
-        nics->rref_rx = val ? strtol(val, NULL, 10) : -1;
-        nics->frontend = xs_read(ctx->xsh, XBT_NULL,
-                                 libxl__sprintf(&gc, "%s/frontend", nics->backend), NULL);
-        val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/frontend-id", nics->backend));
-        nics->frontend_id = val ? strtoul(val, NULL, 10) : -1;
-        nics->script = xs_read(ctx->xsh, XBT_NULL,
-                               libxl__sprintf(&gc, "%s/script", nics->backend), NULL);
+    nicinfo->devid = nic->devid;
+
+    nicpath = libxl__sprintf(&gc, "%s/device/vif/%d", dompath, nicinfo->devid);
+    nicinfo->backend = xs_read(ctx->xsh, XBT_NULL,
+                                libxl__sprintf(&gc, "%s/backend", nicpath), NULL);
+    if (!nicinfo->backend) {
+        libxl__free_all(&gc);
+        return ERROR_FAIL;
     }
+    val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/backend-id", nicpath));
+    nicinfo->backend_id = val ? strtoul(val, NULL, 10) : -1;
+    val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/state", nicpath));
+    nicinfo->state = val ? strtoul(val, NULL, 10) : -1;
+    val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/event-channel", nicpath));
+    nicinfo->evtch = val ? strtoul(val, NULL, 10) : -1;
+    val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/tx-ring-ref", nicpath));
+    nicinfo->rref_tx = val ? strtoul(val, NULL, 10) : -1;
+    val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/rx-ring-ref", nicpath));
+    nicinfo->rref_rx = val ? strtoul(val, NULL, 10) : -1;
+    nicinfo->frontend = xs_read(ctx->xsh, XBT_NULL,
+                                 libxl__sprintf(&gc, "%s/frontend", nicinfo->backend), NULL);
+    val = libxl__xs_read(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/frontend-id", nicinfo->backend));
+    nicinfo->frontend_id = val ? strtoul(val, NULL, 10) : -1;
 
     libxl__free_all(&gc);
-    return res;
-err:
-    libxl__free_all(&gc);
-    return NULL;
+    return 0;
 }
 
 /******************************************************************************/
diff -r 25db0629e338 -r e94763a6bd34 tools/libxl/libxl.h
--- a/tools/libxl/libxl.h	Fri Sep 30 14:27:27 2011 +0100
+++ b/tools/libxl/libxl.h	Fri Sep 30 14:27:27 2011 +0100
@@ -467,7 +467,9 @@ int libxl_device_disk_local_detach(libxl
 int libxl_device_nic_init(libxl_device_nic *nic, int dev_num);
 int libxl_device_nic_add(libxl_ctx *ctx, uint32_t domid, libxl_device_nic *nic);
 int libxl_device_nic_del(libxl_ctx *ctx, uint32_t domid, libxl_device_nic *nic, int wait);
-libxl_nicinfo *libxl_list_nics(libxl_ctx *ctx, uint32_t domid, unsigned int *nb);
+libxl_device_nic *libxl_device_nic_list(libxl_ctx *ctx, uint32_t domid, int *num);
+int libxl_device_nic_getinfo(libxl_ctx *ctx, uint32_t domid,
+                              libxl_device_nic *nic, libxl_nicinfo *nicinfo);
 
 int libxl_device_console_add(libxl_ctx *ctx, uint32_t domid, libxl_device_console *console);
 
diff -r 25db0629e338 -r e94763a6bd34 tools/libxl/libxl_types.idl
--- a/tools/libxl/libxl_types.idl	Fri Sep 30 14:27:27 2011 +0100
+++ b/tools/libxl/libxl_types.idl	Fri Sep 30 14:27:27 2011 +0100
@@ -330,8 +330,6 @@ libxl_nicinfo = Struct("nicinfo", [
     ("frontend_id", uint32),
     ("devid", integer),
     ("state", integer),
-    ("script", string),
-    ("mac", libxl_mac),
     ("evtch", integer),
     ("rref_tx", integer),
     ("rref_rx", integer),
diff -r 25db0629e338 -r e94763a6bd34 tools/libxl/libxl_utils.c
--- a/tools/libxl/libxl_utils.c	Fri Sep 30 14:27:27 2011 +0100
+++ b/tools/libxl/libxl_utils.c	Fri Sep 30 14:27:27 2011 +0100
@@ -451,15 +451,15 @@ int libxl_pipe(libxl_ctx *ctx, int pipes
 int libxl_mac_to_device_nic(libxl_ctx *ctx, uint32_t domid,
                             const char *mac, libxl_device_nic *nic)
 {
-    libxl_nicinfo *nics;
-    unsigned int nb, rc, i;
+    libxl_device_nic *nics;
+    int nb, rc, i;
     libxl_mac mac_n;
 
     rc = libxl__parse_mac(mac, mac_n);
     if (rc)
         return rc;
 
-    nics = libxl_list_nics(ctx, domid, &nb);
+    nics = libxl_device_nic_list(ctx, domid, &nb);
     if (!nics)
         return ERROR_FAIL;
 
@@ -468,17 +468,17 @@ int libxl_mac_to_device_nic(libxl_ctx *c
     rc = ERROR_INVAL;
     for (i = 0; i < nb; ++i) {
         if (!libxl__compare_macs(&mac_n, &nics[i].mac)) {
-            nic->backend_domid = nics[i].backend_id;
-            nic->devid = nics[i].devid;
-            memcpy(nic->mac, nics[i].mac, sizeof (nic->mac));
-            nic->script = strdup(nics[i].script);
+            *nic = nics[i];
             rc = 0;
+            i++; /* Do not destroy this NIC on exit path */
             break;
         }
+        libxl_device_nic_destroy(&nics[i]);
     }
 
-    for (i=0; i<nb; i++)
-        libxl_nicinfo_destroy(&nics[i]);
+    for (; i<nb; i++)
+        libxl_device_nic_destroy(&nics[i]);
+
     free(nics);
     return rc;
 }
diff -r 25db0629e338 -r e94763a6bd34 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c	Fri Sep 30 14:27:27 2011 +0100
+++ b/tools/libxl/xl_cmdimpl.c	Fri Sep 30 14:27:27 2011 +0100
@@ -4022,8 +4022,9 @@ int main_networkattach(int argc, char **
 int main_networklist(int argc, char **argv)
 {
     int opt;
-    libxl_nicinfo *nics;
-    unsigned int nb, i;
+    libxl_device_nic *nics;
+    libxl_nicinfo nicinfo;
+    int nb, i;
 
     if ((opt = def_getopt(argc, argv, "", "network-list", 1)) != -1)
         return opt;
@@ -4036,19 +4037,23 @@ int main_networklist(int argc, char **ar
             fprintf(stderr, "%s is an invalid domain identifier\n", *argv);
             continue;
         }
-        if (!(nics = libxl_list_nics(ctx, domid, &nb))) {
+        nics = libxl_device_nic_list(ctx, domid, &nb);
+        if (!nics) {
             continue;
         }
         for (i = 0; i < nb; ++i) {
-            /* Idx BE */
-            printf("%-3d %-2d ", nics[i].devid, nics[i].backend_id);
-            /* MAC */
-            printf(LIBXL_MAC_FMT, LIBXL_MAC_BYTES(nics[i].mac));
-            /* Hdl  Sta  evch txr/rxr  BE-path */
-            printf("%6d %5d %6d %5d/%-11d %-30s\n",
-                   nics[i].devid, nics[i].state, nics[i].evtch,
-                   nics[i].rref_tx, nics[i].rref_rx, nics[i].backend);
-            libxl_nicinfo_destroy(&nics[i]);
+            if (!libxl_device_nic_getinfo(ctx, domid, &nics[i], &nicinfo)) {
+                /* Idx BE */
+                printf("%-3d %-2d ", nicinfo.devid, nicinfo.backend_id);
+                /* MAC */
+                printf(LIBXL_MAC_FMT, LIBXL_MAC_BYTES(nics[i].mac));
+                /* Hdl  Sta  evch txr/rxr  BE-path */
+                printf("%6d %5d %6d %5d/%-11d %-30s\n",
+                       nicinfo.devid, nicinfo.state, nicinfo.evtch,
+                       nicinfo.rref_tx, nicinfo.rref_rx, nicinfo.backend);
+                libxl_nicinfo_destroy(&nicinfo);
+            }
+            libxl_device_nic_destroy(&nics[i]);
         }
         free(nics);
     }