udev: net_setup_link - open ethtool and rtnl connections lazily

3 files changed, 39 insertions, 47 deletions

diff --git a/src/udev/net/ethtool-util.c b/src/udev/net/ethtool-util.c
index 3ec245ecab..54cb928091 100644
--- a/src/udev/net/ethtool-util.c
+++ b/src/udev/net/ethtool-util.c
@@ -63,7 +63,7 @@ int ethtool_connect(int *ret) {
         return 0;
 }
 
-int ethtool_get_driver(int fd, const char *ifname, char **ret) {
+int ethtool_get_driver(int *fd, const char *ifname, char **ret) {
         struct ethtool_drvinfo ecmd = {
                 .cmd = ETHTOOL_GDRVINFO
         };
@@ -73,9 +73,17 @@ int ethtool_get_driver(int fd, const char *ifname, char **ret) {
         char *d;
         int r;
 
+        if (*fd < 0) {
+                r = ethtool_connect(fd);
+                if (r < 0) {
+                        log_warning("link_config: could not connect to ethtool: %s", strerror(-r));
+                        return r;
+                }
+        }
+
         strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
 
-        r = ioctl(fd, SIOCETHTOOL, &ifr);
+        r = ioctl(*fd, SIOCETHTOOL, &ifr);
         if (r < 0)
                 return -errno;
 
@@ -87,7 +95,7 @@ int ethtool_get_driver(int fd, const char *ifname, char **ret) {
         return 0;
 }
 
-int ethtool_set_speed(int fd, const char *ifname, unsigned int speed, Duplex duplex)
+int ethtool_set_speed(int *fd, const char *ifname, unsigned int speed, Duplex duplex)
 {
         struct ethtool_cmd ecmd = {
                 .cmd = ETHTOOL_GSET
@@ -101,9 +109,17 @@ int ethtool_set_speed(int fd, const char *ifname, unsigned int speed, Duplex dup
         if (speed == 0 && duplex == _DUP_INVALID)
                 return 0;
 
+        if (*fd < 0) {
+                r = ethtool_connect(fd);
+                if (r < 0) {
+                        log_warning("link_config: could not connect to ethtool: %s", strerror(-r));
+                        return r;
+                }
+        }
+
         strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
 
-        r = ioctl(fd, SIOCETHTOOL, &ifr);
+        r = ioctl(*fd, SIOCETHTOOL, &ifr);
         if (r < 0)
                 return -errno;
 
@@ -132,7 +148,7 @@ int ethtool_set_speed(int fd, const char *ifname, unsigned int speed, Duplex dup
         if (need_update) {
                 ecmd.cmd = ETHTOOL_SSET;
 
-                r = ioctl(fd, SIOCETHTOOL, &ifr);
+                r = ioctl(*fd, SIOCETHTOOL, &ifr);
                 if (r < 0)
                         return -errno;
         }
@@ -140,7 +156,7 @@ int ethtool_set_speed(int fd, const char *ifname, unsigned int speed, Duplex dup
         return 0;
 }
 
-int ethtool_set_wol(int fd, const char *ifname, WakeOnLan wol) {
+int ethtool_set_wol(int *fd, const char *ifname, WakeOnLan wol) {
         struct ethtool_wolinfo ecmd = {
                 .cmd = ETHTOOL_GWOL
         };
@@ -153,9 +169,17 @@ int ethtool_set_wol(int fd, const char *ifname, WakeOnLan wol) {
         if (wol == _WOL_INVALID)
                 return 0;
 
+        if (*fd < 0) {
+                r = ethtool_connect(fd);
+                if (r < 0) {
+                        log_warning("link_config: could not connect to ethtool: %s", strerror(-r));
+                        return r;
+                }
+        }
+
         strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
 
-        r = ioctl(fd, SIOCETHTOOL, &ifr);
+        r = ioctl(*fd, SIOCETHTOOL, &ifr);
         if (r < 0)
                 return -errno;
 
@@ -185,7 +209,7 @@ int ethtool_set_wol(int fd, const char *ifname, WakeOnLan wol) {
         if (need_update) {
                 ecmd.cmd = ETHTOOL_SWOL;
 
-                r = ioctl(fd, SIOCETHTOOL, &ifr);
+                r = ioctl(*fd, SIOCETHTOOL, &ifr);
                 if (r < 0)
                         return -errno;
         }
diff --git a/src/udev/net/ethtool-util.h b/src/udev/net/ethtool-util.h
index f44de5076a..690b1a65aa 100644
--- a/src/udev/net/ethtool-util.h
+++ b/src/udev/net/ethtool-util.h
@@ -42,9 +42,9 @@ typedef enum WakeOnLan {
 
 int ethtool_connect(int *ret);
 
-int ethtool_get_driver(int fd, const char *ifname, char **ret);
-int ethtool_set_speed(int fd, const char *ifname, unsigned int speed, Duplex duplex);
-int ethtool_set_wol(int fd, const char *ifname, WakeOnLan wol);
+int ethtool_get_driver(int *fd, const char *ifname, char **ret);
+int ethtool_set_speed(int *fd, const char *ifname, unsigned int speed, Duplex duplex);
+int ethtool_set_wol(int *fd, const char *ifname, WakeOnLan wol);
 
 const char *duplex_to_string(Duplex d) _const_;
 Duplex duplex_from_string(const char *d) _pure_;
diff --git a/src/udev/net/link-config.c b/src/udev/net/link-config.c
index 64ff00dc0d..ee2865a863 100644
--- a/src/udev/net/link-config.c
+++ b/src/udev/net/link-config.c
@@ -88,30 +88,6 @@ int link_config_ctx_new(link_config_ctx **ret) {
         return 0;
 }
 
-static int link_config_ctx_connect(link_config_ctx *ctx) {
-        int r;
-
-        if (ctx->ethtool_fd == -1) {
-                r = ethtool_connect(&ctx->ethtool_fd);
-                if (r < 0) {
-                        log_warning("link_config: could not connect to ethtool: %s",
-                                    strerror(-r));
-                        return r;
-                }
-        }
-
-        if (!ctx->rtnl) {
-                r = sd_rtnl_open(&ctx->rtnl, 0);
-                if (r < 0) {
-                        log_warning("link_config: could not connect to rtnl: %s",
-                                    strerror(-r));
-                        return r;
-                }
-        }
-
-        return 0;
-}
-
 static void link_configs_free(link_config_ctx *ctx) {
         link_config *link, *link_next;
 
@@ -361,22 +337,18 @@ int link_config_apply(link_config_ctx *ctx, link_config *config,
         assert(device);
         assert(name);
 
-        r = link_config_ctx_connect(ctx);
-        if (r < 0)
-                return r;
-
         old_name = udev_device_get_sysname(device);
         if (!old_name)
                 return -EINVAL;
 
-        r = ethtool_set_speed(ctx->ethtool_fd, old_name, config->speed / 1024,
+        r = ethtool_set_speed(&ctx->ethtool_fd, old_name, config->speed / 1024,
                               config->duplex);
         if (r < 0)
                 log_warning("Could not set speed or duplex of %s to %u Mbps (%s): %s",
                             old_name, config->speed / 1024,
                             duplex_to_string(config->duplex), strerror(-r));
 
-        r = ethtool_set_wol(ctx->ethtool_fd, old_name, config->wol);
+        r = ethtool_set_wol(&ctx->ethtool_fd, old_name, config->wol);
         if (r < 0)
                 log_warning("Could not set WakeOnLan of %s to %s: %s",
                             old_name, wol_to_string(config->wol), strerror(-r));
@@ -449,7 +421,7 @@ int link_config_apply(link_config_ctx *ctx, link_config *config,
                         mac = config->mac;
         }
 
-        r = rtnl_set_link_properties(ctx->rtnl, ifindex, config->alias, mac,
+        r = rtnl_set_link_properties(&ctx->rtnl, ifindex, config->alias, mac,
                                      config->mtu);
         if (r < 0) {
                 log_warning("Could not set Alias, MACAddress or MTU on %s: %s",
@@ -467,15 +439,11 @@ int link_get_driver(link_config_ctx *ctx, struct udev_device *device, char **ret
         char *driver;
         int r;
 
-        r = link_config_ctx_connect(ctx);
-        if (r < 0)
-                return r;
-
         name = udev_device_get_sysname(device);
         if (!name)
                 return -EINVAL;
 
-        r = ethtool_get_driver(ctx->ethtool_fd, name, &driver);
+        r = ethtool_get_driver(&ctx->ethtool_fd, name, &driver);
         if (r < 0)
                 return r;