[Xen-devel] [PATCH 3 of 6] xl: network-detach command

[Eric Chanudet <eric.chanudet@xxxxxxxxxx>]

This patch adds network-detach command to xl.

Usage: xl network-detach <Domain> <DevId|mac>

diff --git a/tools/libxl/libxl_utils.c b/tools/libxl/libxl_utils.c
--- a/tools/libxl/libxl_utils.c
+++ b/tools/libxl/libxl_utils.c
@@ -356,3 +356,77 @@ int libxl_pipe(struct libxl_ctx *ctx, in
     }
     return 0;
 }
+
+int libxl_mac_to_device_nic(struct libxl_ctx *ctx, uint32_t domid,
+                            const char *mac, libxl_device_nic *nic)
+{
+    libxl_nicinfo *nics;
+    unsigned int nb, i;
+    uint8_t mac_n[6];
+    uint8_t *a, *b;
+    const char *tok;
+    char *endptr;
+
+    nics = libxl_list_nics(ctx, domid, &nb);
+    if (!nics) {
+        return ERROR_FAIL;
+    }
+
+    for (i = 0, tok = mac; *tok && (i < 6); ++i, tok += 3) {
+        mac_n[i] = strtol(tok, &endptr, 16);
+        if (endptr != (tok + 2)) {
+            return ERROR_INVAL;
+        }
+    }
+    memset(nic, 0, sizeof (libxl_device_nic));
+    for (; nb; --nb, ++nics) {
+        for (i = 0, a = nics->mac, b = mac_n;
+             (b < mac_n + 6) && (*a == *b); ++a, ++b)
+            ;
+        if ((b >= mac_n + 6) && (*a == *b)) {
+            nic->backend_domid = nics->backend_id;
+            nic->domid = nics->frontend_id;
+            nic->devid = nics->devid;
+            memcpy(nic->mac, nics->mac, sizeof (nic->mac));
+            nic->script = nics->script;
+            libxl_free(ctx, nics);
+            return 0;
+        }
+    }
+
+    libxl_free(ctx, nics);
+    return 0;
+}
+
+int libxl_devid_to_device_nic(struct libxl_ctx *ctx, uint32_t domid,
+                              const char *devid, libxl_device_nic *nic)
+{
+    char *tok, *val;
+    char *dompath, *nic_path_fe, *nic_path_be;
+    unsigned int i;
+
+    memset(nic, 0, sizeof (libxl_device_nic));
+    dompath = libxl_xs_get_dompath(ctx, domid);
+    if (!dompath) {
+        return ERROR_FAIL;
+    }
+    nic_path_fe = libxl_sprintf(ctx, "%s/device/vif/%s", dompath, devid);
+    nic_path_be = libxl_xs_read(ctx, XBT_NULL,
+                                libxl_sprintf(ctx, "%s/backend", nic_path_fe));
+    val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/backend-id", 
nic_path_fe));
+    nic->backend_domid = strtoul(val, NULL, 10);
+    nic->devid = strtoul(devid, NULL, 10);
+    libxl_free(ctx, val);
+
+    val = libxl_xs_read(ctx, XBT_NULL, libxl_sprintf(ctx, "%s/mac", 
nic_path_fe));
+    for (i = 0, tok = strtok(val, ":"); tok && (i < 6);
+         ++i, tok = strtok(NULL, ":")) {
+        nic->mac[i] = strtoul(tok, NULL, 16);
+    }
+    libxl_free(ctx, val);
+    nic->script = libxl_xs_read(ctx, XBT_NULL,
+                                libxl_sprintf(ctx, "%s/script", nic_path_be));
+    libxl_free(ctx, nic_path_fe);
+    libxl_free(ctx, nic_path_be);
+    return 0;
+}
diff --git a/tools/libxl/libxl_utils.h b/tools/libxl/libxl_utils.h
--- a/tools/libxl/libxl_utils.h
+++ b/tools/libxl/libxl_utils.h
@@ -55,6 +55,12 @@ void libxl_report_child_exitstatus(struc
     /* treats all exit statuses as errors; if that's not what you want,
      * check status yourself first */
 
+
+int libxl_mac_to_device_nic(struct libxl_ctx *ctx, uint32_t domid,
+                            const char *mac, libxl_device_nic *nic);
+int libxl_devid_to_device_nic(struct libxl_ctx *ctx, uint32_t domid,
+                              const char *devid, libxl_device_nic *nic);
+
 /* log levels: */
 #define XL_LOG_DEBUG 3
 #define XL_LOG_INFO 2
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -3189,3 +3189,45 @@ int main_networklist(int argc, char **ar
     }
     exit(0);
 }
+
+int main_networkdetach(int argc, char **argv)
+{
+    int opt;
+    libxl_device_nic nic;
+
+    if (argc != 3) {
+        help("network-detach");
+        exit(0);
+    }
+    while ((opt = getopt(argc, argv, "hl")) != -1) {
+        switch (opt) {
+        case 'h':
+            help("network-detach");
+            exit(0);
+        default:
+            fprintf(stderr, "option `%c' not supported.\n", opt);
+            break;
+        }
+    }
+
+    if (domain_qualifier_to_domid(argv[1], &domid, 0) < 0) {
+        fprintf(stderr, "%s is an invalid domain identifier\n", argv[1]);
+        exit(1);
+    }
+
+    if (!strchr(argv[2], ':')) {
+        if (libxl_devid_to_device_nic(&ctx, domid, argv[2], &nic)) {
+            fprintf(stderr, "Unknown device %s.\n", argv[2]);
+            exit(1);
+        }
+    } else {
+        if (libxl_mac_to_device_nic(&ctx, domid, argv[2], &nic)) {
+            fprintf(stderr, "Unknown device %s.\n", argv[2]);
+            exit(1);
+        }
+    }
+    if (libxl_device_nic_del(&ctx, &nic, 1)) {
+        fprintf(stderr, "libxl_device_nic_del failed.\n");
+    }
+    exit(0);
+}
diff --git a/tools/libxl/xl_cmdimpl.h b/tools/libxl/xl_cmdimpl.h
--- a/tools/libxl/xl_cmdimpl.h
+++ b/tools/libxl/xl_cmdimpl.h
@@ -41,5 +41,6 @@ int main_rename(int argc, char **argv);
 int main_trigger(int argc, char **argv);
 int main_networkattach(int argc, char **argv);
 int main_networklist(int argc, char **argv);
+int main_networkdetach(int argc, char **argv);
 
 void help(char *command);
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -180,6 +180,10 @@ struct cmd_spec cmd_table[] = {
       &main_networklist,
       "List virtual network interfaces for a domain"
     },
+    { "network-detach",
+      &main_networkdetach,
+      "Destroy a domain's virtual network device"
+    },
 };
 
 int cmdtable_len = sizeof(cmd_table)/sizeof(struct cmd_spec);

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