X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fnetdev.c;h=f06742aecb441c67c4f052fc1b9376839cf0f8ca;hb=f7a122fc2457f805fd0906f4368ea42d2ea55584;hp=d108e9ca80669c16c0b3de9f0164c791174241b1;hpb=d76f09ea77e03ee5a3a7bb67bcab1ac4bb54172b;p=sliver-openvswitch.git diff --git a/lib/netdev.c b/lib/netdev.c index d108e9ca8..f06742aec 100644 --- a/lib/netdev.c +++ b/lib/netdev.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -75,6 +75,7 @@ netdev_initialize(void) #ifdef HAVE_NETLINK netdev_register_provider(&netdev_linux_class); + netdev_register_provider(&netdev_internal_class); netdev_register_provider(&netdev_tap_class); netdev_vport_register(); #endif @@ -167,6 +168,13 @@ netdev_unregister_provider(const char *type) return 0; } +const struct netdev_class * +netdev_lookup_provider(const char *type) +{ + netdev_initialize(); + return shash_find_data(&netdev_classes, type && type[0] ? type : "system"); +} + /* Clears 'types' and enumerates the types of all currently registered netdev * providers into it. The caller must first initialize the svec. */ void @@ -183,95 +191,11 @@ netdev_enumerate_types(struct svec *types) } } -/* Compares 'args' to those used to those used by 'dev'. Returns true - * if the arguments are the same, false otherwise. Does not update the - * values stored in 'dev'. */ -static bool -compare_device_args(const struct netdev_dev *dev, const struct shash *args) -{ - const struct shash_node **new_args; - bool result = true; - int i; - - if (shash_count(args) != dev->n_args) { - return false; - } - - new_args = shash_sort(args); - for (i = 0; i < dev->n_args; i++) { - if (strcmp(dev->args[i].key, new_args[i]->name) || - strcmp(dev->args[i].value, new_args[i]->data)) { - result = false; - goto finish; - } - } - -finish: - free(new_args); - return result; -} - -static int -compare_args(const void *a_, const void *b_) -{ - const struct arg *a = a_; - const struct arg *b = b_; - return strcmp(a->key, b->key); -} - void update_device_args(struct netdev_dev *dev, const struct shash *args) { - struct shash_node *node; - int i; - - if (dev->n_args) { - for (i = 0; i < dev->n_args; i++) { - free(dev->args[i].key); - free(dev->args[i].value); - } - - free(dev->args); - dev->n_args = 0; - } - - if (!args || shash_is_empty(args)) { - return; - } - - dev->n_args = shash_count(args); - dev->args = xmalloc(dev->n_args * sizeof *dev->args); - - i = 0; - SHASH_FOR_EACH(node, args) { - dev->args[i].key = xstrdup(node->name); - dev->args[i].value = xstrdup(node->data); - i++; - } - - qsort(dev->args, dev->n_args, sizeof *dev->args, compare_args); -} - -static int -create_device(struct netdev_options *options, struct netdev_dev **netdev_devp) -{ - struct netdev_class *netdev_class; - int error; - - if (!options->type || strlen(options->type) == 0) { - /* Default to system. */ - options->type = "system"; - } - - netdev_class = shash_find_data(&netdev_classes, options->type); - if (!netdev_class) { - return EAFNOSUPPORT; - } - - error = netdev_class->create(netdev_class, options->name, options->args, - netdev_devp); - assert(error || (*netdev_devp)->netdev_class == netdev_class); - return error; + smap_destroy(&dev->args); + smap_clone(&dev->args, args); } /* Opens the network device named 'name' (e.g. "eth0") and returns zero if @@ -302,18 +226,23 @@ netdev_open(struct netdev_options *options, struct netdev **netdevp) netdev_dev = shash_find_data(&netdev_dev_shash, options->name); if (!netdev_dev) { - error = create_device(options, &netdev_dev); + const struct netdev_class *class; + + class = netdev_lookup_provider(options->type); + if (!class) { + VLOG_WARN("could not create netdev %s of unknown type %s", + options->name, options->type); + return EAFNOSUPPORT; + } + error = class->create(class, options->name, options->args, + &netdev_dev); if (error) { - if (error == EAFNOSUPPORT) { - VLOG_WARN("could not create netdev %s of unknown type %s", - options->name, options->type); - } return error; } - update_device_args(netdev_dev, options->args); + assert(netdev_dev->netdev_class == class); } else if (!shash_is_empty(options->args) && - !compare_device_args(netdev_dev, options->args)) { + !smap_equal(&netdev_dev->args, options->args)) { VLOG_WARN("%s: attempted to open already open netdev with " "different arguments", options->name); @@ -349,7 +278,7 @@ netdev_open_default(const char *name, struct netdev **netdevp) /* Reconfigures the device 'netdev' with 'args'. 'args' may be empty * or NULL if none are needed. */ int -netdev_reconfigure(struct netdev *netdev, const struct shash *args) +netdev_set_config(struct netdev *netdev, const struct shash *args) { struct shash empty_args = SHASH_INITIALIZER(&empty_args); struct netdev_dev *netdev_dev = netdev_get_dev(netdev); @@ -358,19 +287,31 @@ netdev_reconfigure(struct netdev *netdev, const struct shash *args) args = &empty_args; } - if (netdev_dev->netdev_class->reconfigure) { - if (!compare_device_args(netdev_dev, args)) { + if (netdev_dev->netdev_class->set_config) { + if (!smap_equal(&netdev_dev->args, args)) { update_device_args(netdev_dev, args); - return netdev_dev->netdev_class->reconfigure(netdev_dev, args); + return netdev_dev->netdev_class->set_config(netdev_dev, args); } } else if (!shash_is_empty(args)) { - VLOG_WARN("%s: arguments provided to device that does not have a " - "reconfigure function", netdev_get_name(netdev)); + VLOG_WARN("%s: arguments provided to device whose configuration " + "cannot be changed", netdev_get_name(netdev)); } return 0; } +/* Returns the current configuration for 'netdev'. This is either the + * configuration passed to netdev_open() or netdev_set_config(), or it is a + * configuration retrieved from the device itself if no configuration was + * passed to those functions. + * + * 'netdev' retains ownership of the returned configuration. */ +const struct shash * +netdev_get_config(const struct netdev *netdev) +{ + return &netdev_get_dev(netdev)->args; +} + /* Closes and destroys 'netdev'. */ void netdev_close(struct netdev *netdev) @@ -580,8 +521,9 @@ netdev_get_name(const struct netdev *netdev) * (and received) packets, in bytes, not including the hardware header; thus, * this is typically 1500 bytes for Ethernet devices. * - * If successful, returns 0 and stores the MTU size in '*mtup'. On failure, - * returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in + * If successful, returns 0 and stores the MTU size in '*mtup'. Stores INT_MAX + * in '*mtup' if 'netdev' does not have an MTU (as e.g. some tunnels do not).On + * failure, returns a positive errno value and stores ETH_PAYLOAD_MAX (1500) in * '*mtup'. */ int netdev_get_mtu(const struct netdev *netdev, int *mtup) @@ -626,11 +568,11 @@ netdev_get_ifindex(const struct netdev *netdev) * Some network devices may not implement support for this function. In such * cases this function will always return EOPNOTSUPP. */ int -netdev_get_features(struct netdev *netdev, +netdev_get_features(const struct netdev *netdev, uint32_t *current, uint32_t *advertised, uint32_t *supported, uint32_t *peer) { - int (*get_features)(struct netdev *netdev, + int (*get_features)(const struct netdev *netdev, uint32_t *current, uint32_t *advertised, uint32_t *supported, uint32_t *peer); uint32_t dummy[4]; @@ -777,6 +719,21 @@ netdev_get_next_hop(const struct netdev *netdev, return error; } +/* Populates 'sh' with status information. + * + * Populates 'sh' with 'netdev' specific status information. This information + * may be used to populate the status column of the Interface table as defined + * in ovs-vswitchd.conf.db(5). */ +int +netdev_get_status(const struct netdev *netdev, struct shash *sh) +{ + struct netdev_dev *dev = netdev_get_dev(netdev); + + return (dev->netdev_class->get_status + ? dev->netdev_class->get_status(netdev, sh) + : EOPNOTSUPP); +} + /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address and * returns 0. Otherwise, returns a positive errno value and sets '*in6' to * all-zero-bits (in6addr_any). @@ -928,6 +885,34 @@ netdev_get_carrier(const struct netdev *netdev) return carrier; } +/* Returns true if 'netdev' is up according to its MII. */ +bool +netdev_get_miimon(const struct netdev *netdev) +{ + int error; + enum netdev_flags flags; + bool miimon; + + netdev_get_flags(netdev, &flags); + if (!(flags & NETDEV_UP)) { + return false; + } + + if (!netdev_get_dev(netdev)->netdev_class->get_miimon) { + return true; + } + + error = netdev_get_dev(netdev)->netdev_class->get_miimon(netdev, &miimon); + + if (error) { + VLOG_DBG("%s: failed to get network device MII status, assuming " + "down: %s", netdev_get_name(netdev), strerror(error)); + miimon = false; + } + + return miimon; +} + /* Retrieves current device stats for 'netdev'. */ int netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats) @@ -1294,14 +1279,21 @@ exit: return netdev; } -/* Initializes 'netdev_dev' as a netdev device named 'name' of the - * specified 'netdev_class'. +/* Initializes 'netdev_dev' as a netdev device named 'name' of the specified + * 'netdev_class'. This function is ordinarily called from a netdev provider's + * 'create' function. + * + * 'args' should be the arguments that were passed to the netdev provider's + * 'create'. If an empty set of arguments was passed, and 'name' is the name + * of a network device that existed before the 'create' call, then 'args' may + * instead be the configuration for that existing device. * * This function adds 'netdev_dev' to a netdev-owned shash, so it is * very important that 'netdev_dev' only be freed after calling * the refcount drops to zero. */ void netdev_dev_init(struct netdev_dev *netdev_dev, const char *name, + const struct shash *args, const struct netdev_class *netdev_class) { assert(!shash_find(&netdev_dev_shash, name)); @@ -1310,6 +1302,7 @@ netdev_dev_init(struct netdev_dev *netdev_dev, const char *name, netdev_dev->netdev_class = netdev_class; netdev_dev->name = xstrdup(name); netdev_dev->node = shash_add(&netdev_dev_shash, name, netdev_dev); + smap_clone(&netdev_dev->args, args); } /* Undoes the results of initialization. @@ -1327,7 +1320,7 @@ netdev_dev_uninit(struct netdev_dev *netdev_dev, bool destroy) assert(!netdev_dev->ref_cnt); shash_delete(&netdev_dev_shash, netdev_dev->node); - update_device_args(netdev_dev, NULL); + smap_destroy(&netdev_dev->args); if (destroy) { netdev_dev->netdev_class->destroy(netdev_dev);