diff options
| -rw-r--r-- | drivers/net/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/net/netdevsim/Makefile | 4 | ||||
| -rw-r--r-- | drivers/net/netdevsim/devlink.c | 294 | ||||
| -rw-r--r-- | drivers/net/netdevsim/fib.c | 263 | ||||
| -rw-r--r-- | drivers/net/netdevsim/netdev.c | 12 | ||||
| -rw-r--r-- | drivers/net/netdevsim/netdevsim.h | 43 |
6 files changed, 616 insertions, 1 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 08b85215c2be..891846655000 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -500,6 +500,7 @@ source "drivers/net/hyperv/Kconfig" config NETDEVSIM tristate "Simulated networking device" depends on DEBUG_FS + depends on MAY_USE_DEVLINK help This driver is a developer testing tool and software model that can be used to test various control path networking APIs, especially diff --git a/drivers/net/netdevsim/Makefile b/drivers/net/netdevsim/Makefile index 09388c06171d..449b2a1a1800 100644 --- a/drivers/net/netdevsim/Makefile +++ b/drivers/net/netdevsim/Makefile @@ -9,3 +9,7 @@ ifeq ($(CONFIG_BPF_SYSCALL),y) netdevsim-objs += \ bpf.o endif + +ifneq ($(CONFIG_NET_DEVLINK),) +netdevsim-objs += devlink.o fib.o +endif diff --git a/drivers/net/netdevsim/devlink.c b/drivers/net/netdevsim/devlink.c new file mode 100644 index 000000000000..bbdcf064ba10 --- /dev/null +++ b/drivers/net/netdevsim/devlink.c @@ -0,0 +1,294 @@ +/* + * Copyright (c) 2018 Cumulus Networks. All rights reserved. + * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com> + * + * This software is licensed under the GNU General License Version 2, + * June 1991 as shown in the file COPYING in the top-level directory of this + * source tree. + * + * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" + * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE + * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME + * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + */ + +#include <linux/device.h> +#include <net/devlink.h> +#include <net/netns/generic.h> + +#include "netdevsim.h" + +static unsigned int nsim_devlink_id; + +/* place holder until devlink and namespaces is sorted out */ +static struct net *nsim_devlink_net(struct devlink *devlink) +{ + return &init_net; +} + +/* IPv4 + */ +static u64 nsim_ipv4_fib_resource_occ_get(struct devlink *devlink) +{ + struct net *net = nsim_devlink_net(devlink); + + return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, false); +} + +static struct devlink_resource_ops nsim_ipv4_fib_res_ops = { + .occ_get = nsim_ipv4_fib_resource_occ_get, +}; + +static u64 nsim_ipv4_fib_rules_res_occ_get(struct devlink *devlink) +{ + struct net *net = nsim_devlink_net(devlink); + + return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, false); +} + +static struct devlink_resource_ops nsim_ipv4_fib_rules_res_ops = { + .occ_get = nsim_ipv4_fib_rules_res_occ_get, +}; + +/* IPv6 + */ +static u64 nsim_ipv6_fib_resource_occ_get(struct devlink *devlink) +{ + struct net *net = nsim_devlink_net(devlink); + + return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, false); +} + +static struct devlink_resource_ops nsim_ipv6_fib_res_ops = { + .occ_get = nsim_ipv6_fib_resource_occ_get, +}; + +static u64 nsim_ipv6_fib_rules_res_occ_get(struct devlink *devlink) +{ + struct net *net = nsim_devlink_net(devlink); + + return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, false); +} + +static struct devlink_resource_ops nsim_ipv6_fib_rules_res_ops = { + .occ_get = nsim_ipv6_fib_rules_res_occ_get, +}; + +static int devlink_resources_register(struct devlink *devlink) +{ + struct devlink_resource_size_params params = { + .size_max = (u64)-1, + .size_granularity = 1, + .unit = DEVLINK_RESOURCE_UNIT_ENTRY + }; + struct net *net = nsim_devlink_net(devlink); + int err; + u64 n; + + /* Resources for IPv4 */ + err = devlink_resource_register(devlink, "IPv4", (u64)-1, + NSIM_RESOURCE_IPV4, + DEVLINK_RESOURCE_ID_PARENT_TOP, + ¶ms, NULL); + if (err) { + pr_err("Failed to register IPv4 top resource\n"); + goto out; + } + + n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, true); + err = devlink_resource_register(devlink, "fib", n, + NSIM_RESOURCE_IPV4_FIB, + NSIM_RESOURCE_IPV4, + ¶ms, &nsim_ipv4_fib_res_ops); + if (err) { + pr_err("Failed to register IPv4 FIB resource\n"); + return err; + } + + n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, true); + err = devlink_resource_register(devlink, "fib-rules", n, + NSIM_RESOURCE_IPV4_FIB_RULES, + NSIM_RESOURCE_IPV4, + ¶ms, &nsim_ipv4_fib_rules_res_ops); + if (err) { + pr_err("Failed to register IPv4 FIB rules resource\n"); + return err; + } + + /* Resources for IPv6 */ + err = devlink_resource_register(devlink, "IPv6", (u64)-1, + NSIM_RESOURCE_IPV6, + DEVLINK_RESOURCE_ID_PARENT_TOP, + ¶ms, NULL); + if (err) { + pr_err("Failed to register IPv6 top resource\n"); + goto out; + } + + n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, true); + err = devlink_resource_register(devlink, "fib", n, + NSIM_RESOURCE_IPV6_FIB, + NSIM_RESOURCE_IPV6, + ¶ms, &nsim_ipv6_fib_res_ops); + if (err) { + pr_err("Failed to register IPv6 FIB resource\n"); + return err; + } + + n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, true); + err = devlink_resource_register(devlink, "fib-rules", n, + NSIM_RESOURCE_IPV6_FIB_RULES, + NSIM_RESOURCE_IPV6, + ¶ms, &nsim_ipv6_fib_rules_res_ops); + if (err) { + pr_err("Failed to register IPv6 FIB rules resource\n"); + return err; + } +out: + return err; +} + +static int nsim_devlink_reload(struct devlink *devlink) +{ + enum nsim_resource_id res_ids[] = { + NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES, + NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES + }; + struct net *net = nsim_devlink_net(devlink); + int i; + + for (i = 0; i < ARRAY_SIZE(res_ids); ++i) { + int err; + u64 val; + + err = devlink_resource_size_get(devlink, res_ids[i], &val); + if (!err) { + err = nsim_fib_set_max(net, res_ids[i], val); + if (err) + return err; + } + } + + return 0; +} + +static void nsim_devlink_net_reset(struct net *net) +{ + enum nsim_resource_id res_ids[] = { + NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES, + NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES + }; + int i; + + for (i = 0; i < ARRAY_SIZE(res_ids); ++i) { + if (nsim_fib_set_max(net, res_ids[i], (u64)-1)) { + pr_err("Failed to reset limit for resource %u\n", + res_ids[i]); + } + } +} + +static const struct devlink_ops nsim_devlink_ops = { + .reload = nsim_devlink_reload, +}; + +/* once devlink / namespace issues are sorted out + * this needs to be net in which a devlink instance + * is to be created. e.g., dev_net(ns->netdev) + */ +static struct net *nsim_to_net(struct netdevsim *ns) +{ + return &init_net; +} + +void nsim_devlink_teardown(struct netdevsim *ns) +{ + if (ns->devlink) { + struct net *net = nsim_to_net(ns); + bool *reg_devlink = net_generic(net, nsim_devlink_id); + + devlink_unregister(ns->devlink); + devlink_free(ns->devlink); + ns->devlink = NULL; + + nsim_devlink_net_reset(net); + *reg_devlink = true; + } +} + +void nsim_devlink_setup(struct netdevsim *ns) +{ + struct net *net = nsim_to_net(ns); + bool *reg_devlink = net_generic(net, nsim_devlink_id); + struct devlink *devlink; + int err = -ENOMEM; + + /* only one device per namespace controls devlink */ + if (!*reg_devlink) { + ns->devlink = NULL; + return; + } + + devlink = devlink_alloc(&nsim_devlink_ops, 0); + if (!devlink) + return; + + err = devlink_register(devlink, &ns->dev); + if (err) + goto err_devlink_free; + + err = devlink_resources_register(devlink); + if (err) + goto err_dl_unregister; + + ns->devlink = devlink; + + *reg_devlink = false; + + return; + +err_dl_unregister: + devlink_unregister(devlink); +err_devlink_free: + devlink_free(devlink); +} + +/* Initialize per network namespace state */ +static int __net_init nsim_devlink_netns_init(struct net *net) +{ + bool *reg_devlink = net_generic(net, nsim_devlink_id); + + *reg_devlink = true; + + return 0; +} + +static struct pernet_operations nsim_devlink_net_ops __net_initdata = { + .init = nsim_devlink_netns_init, + .id = &nsim_devlink_id, + .size = sizeof(bool), +}; + +void nsim_devlink_exit(void) +{ + unregister_pernet_subsys(&nsim_devlink_net_ops); + nsim_fib_exit(); +} + +int nsim_devlink_init(void) +{ + int err; + + err = nsim_fib_init(); + if (err) + goto err_out; + + err = register_pernet_subsys(&nsim_devlink_net_ops); + if (err) + nsim_fib_exit(); + +err_out: + return err; +} diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c new file mode 100644 index 000000000000..0d105bafa261 --- /dev/null +++ b/drivers/net/netdevsim/fib.c @@ -0,0 +1,263 @@ +/* + * Copyright (c) 2018 Cumulus Networks. All rights reserved. + * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com> + * + * This software is licensed under the GNU General License Version 2, + * June 1991 as shown in the file COPYING in the top-level directory of this + * source tree. + * + * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" + * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE + * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME + * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + */ + +#include <net/fib_notifier.h> +#include <net/ip_fib.h> +#include <net/ip6_fib.h> +#include <net/fib_rules.h> +#include <net/netns/generic.h> + +#include "netdevsim.h" + +struct nsim_fib_entry { + u64 max; + u64 num; +}; + +struct nsim_per_fib_data { + struct nsim_fib_entry fib; + struct nsim_fib_entry rules; +}; + +struct nsim_fib_data { + struct nsim_per_fib_data ipv4; + struct nsim_per_fib_data ipv6; +}; + +static unsigned int nsim_fib_net_id; + +u64 nsim_fib_get_val(struct net *net, enum nsim_resource_id res_id, bool max) +{ + struct nsim_fib_data *fib_data = net_generic(net, nsim_fib_net_id); + struct nsim_fib_entry *entry; + + switch (res_id) { + case NSIM_RESOURCE_IPV4_FIB: + entry = &fib_data->ipv4.fib; + break; + case NSIM_RESOURCE_IPV4_FIB_RULES: + entry = &fib_data->ipv4.rules; + break; + case NSIM_RESOURCE_IPV6_FIB: + entry = &fib_data->ipv6.fib; + break; + case NSIM_RESOURCE_IPV6_FIB_RULES: + entry = &fib_data->ipv6.rules; + break; + default: + return 0; + } + + return max ? entry->max : entry->num; +} + +int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val) +{ + struct nsim_fib_data *fib_data = net_generic(net, nsim_fib_net_id); + struct nsim_fib_entry *entry; + int err = 0; + + switch (res_id) { + case NSIM_RESOURCE_IPV4_FIB: + entry = &fib_data->ipv4.fib; + break; + case NSIM_RESOURCE_IPV4_FIB_RULES: + entry = &fib_data->ipv4.rules; + break; + case NSIM_RESOURCE_IPV6_FIB: + entry = &fib_data->ipv6.fib; + break; + case NSIM_RESOURCE_IPV6_FIB_RULES: + entry = &fib_data->ipv6.rules; + break; + default: + return 0; + } + + /* not allowing a new max to be less than curren occupancy + * --> no means of evicting entries + */ + if (val < entry->num) + err = -EINVAL; + else + entry->max = val; + + return err; +} + +static int nsim_fib_rule_account(struct nsim_fib_entry *entry, bool add, + struct netlink_ext_ack *extack) +{ + int err = 0; + + if (add) { + if (entry->num < entry->max) { + entry->num++; + } else { + err = -ENOSPC; + NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib rule entries"); + } + } else { + entry->num--; + } + + return err; +} + +static int nsim_fib_rule_event(struct fib_notifier_info *info, bool add) +{ + struct nsim_fib_data *data = net_generic(info->net, nsim_fib_net_id); + struct netlink_ext_ack *extack = info->extack; + int err = 0; + + switch (info->family) { + case AF_INET: + err = nsim_fib_rule_account(&data->ipv4.rules, add, extack); + break; + case AF_INET6: + err = nsim_fib_rule_account(&data->ipv6.rules, add, extack); + break; + } + + return err; +} + +static int nsim_fib_account(struct nsim_fib_entry *entry, bool add, + struct netlink_ext_ack *extack) +{ + int err = 0; + + if (add) { + if (entry->num < entry->max) { + entry->num++; + } else { + err = -ENOSPC; + NL_SET_ERR_MSG_MOD(extack, "Exceeded number of supported fib entries"); + } + } else { + entry->num--; + } + + return err; +} + +static int nsim_fib_event(struct fib_notifier_info *info, bool add) +{ + struct nsim_fib_data *data = net_generic(info->net, nsim_fib_net_id); + struct netlink_ext_ack *extack = info->extack; + int err = 0; + + switch (info->family) { + case AF_INET: + err = nsim_fib_account(&data->ipv4.fib, add, extack); + break; + case AF_INET6: + err = nsim_fib_account(&data->ipv6.fib, add, extack); + break; + } + + return err; +} + +static int nsim_fib_event_nb(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct fib_notifier_info *info = ptr; + int err = 0; + + switch (event) { + case FIB_EVENT_RULE_ADD: /* fall through */ + case FIB_EVENT_RULE_DEL: + err = nsim_fib_rule_event(info, event == FIB_EVENT_RULE_ADD); + break; + + case FIB_EVENT_ENTRY_ADD: /* fall through */ + case FIB_EVENT_ENTRY_DEL: + err = nsim_fib_event(info, event == FIB_EVENT_ENTRY_ADD); + break; + } + + return notifier_from_errno(err); +} + +/* inconsistent dump, trying again */ +static void nsim_fib_dump_inconsistent(struct notifier_block *nb) +{ + struct nsim_fib_data *data; + struct net *net; + + rcu_read_lock(); + for_each_net_rcu(net) { + data = net_generic(net, nsim_fib_net_id); + + data->ipv4.fib.num = 0ULL; + data->ipv4.rules.num = 0ULL; + + data->ipv6.fib.num = 0ULL; + data->ipv6.rules.num = 0ULL; + } + rcu_read_unlock(); +} + +static struct notifier_block nsim_fib_nb = { + .notifier_call = nsim_fib_event_nb, +}; + +/* Initialize per network namespace state */ +static int __net_init nsim_fib_netns_init(struct net *net) +{ + struct nsim_fib_data *data = net_generic(net, nsim_fib_net_id); + + data->ipv4.fib.max = (u64)-1; + data->ipv4.rules.max = (u64)-1; + + data->ipv6.fib.max = (u64)-1; + data->ipv6.rules.max = (u64)-1; + + return 0; +} + +static struct pernet_operations nsim_fib_net_ops __net_initdata = { + .init = nsim_fib_netns_init, + .id = &nsim_fib_net_id, + .size = sizeof(struct nsim_fib_data), +}; + +void nsim_fib_exit(void) +{ + unregister_pernet_subsys(&nsim_fib_net_ops); + unregister_fib_notifier(&nsim_fib_nb); +} + +int nsim_fib_init(void) +{ + int err; + + err = register_pernet_subsys(&nsim_fib_net_ops); + if (err < 0) { + pr_err("Failed to register pernet subsystem\n"); + goto err_out; + } + + err = register_fib_notifier(&nsim_fib_nb, nsim_fib_dump_inconsistent); + if (err < 0) { + pr_err("Failed to register fib notifier\n"); + goto err_out; + } + +err_out: + return err; +} diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index 3fd567928f3d..8b30ab3ea2c2 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -167,6 +167,8 @@ static int nsim_init(struct net_device *dev) SET_NETDEV_DEV(dev, &ns->dev); + nsim_devlink_setup(ns); + return 0; err_bpf_uninit: @@ -180,6 +182,7 @@ static void nsim_uninit(struct net_device *dev) { struct netdevsim *ns = netdev_priv(dev); + nsim_devlink_teardown(ns); debugfs_remove_recursive(ns->ddir); nsim_bpf_uninit(ns); } @@ -478,12 +481,18 @@ static int __init nsim_module_init(void) if (err) goto err_debugfs_destroy; - err = rtnl_link_register(&nsim_link_ops); + err = nsim_devlink_init(); if (err) goto err_unreg_bus; + err = rtnl_link_register(&nsim_link_ops); + if (err) + goto err_dl_fini; + return 0; +err_dl_fini: + nsim_devlink_exit(); err_unreg_bus: bus_unregister(&nsim_bus); err_debugfs_destroy: @@ -494,6 +503,7 @@ err_debugfs_destroy: static void __exit nsim_module_exit(void) { rtnl_link_unregister(&nsim_link_ops); + nsim_devlink_exit(); bus_unregister(&nsim_bus); debugfs_remove_recursive(nsim_ddir); } diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index ea081c10efb8..afb8cf90c0fd 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -64,6 +64,9 @@ struct netdevsim { bool bpf_map_accept; struct list_head bpf_bound_maps; +#if IS_ENABLED(CONFIG_NET_DEVLINK) + struct devlink *devlink; +#endif }; extern struct dentry *nsim_ddir; @@ -103,6 +106,46 @@ nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data, } #endif +#if IS_ENABLED(CONFIG_NET_DEVLINK) +enum nsim_resource_id { + NSIM_RESOURCE_NONE, /* DEVLINK_RESOURCE_ID_PARENT_TOP */ + NSIM_RESOURCE_IPV4, + NSIM_RESOURCE_IPV4_FIB, + NSIM_RESOURCE_IPV4_FIB_RULES, + NSIM_RESOURCE_IPV6, + NSIM_RESOURCE_IPV6_FIB, + NSIM_RESOURCE_IPV6_FIB_RULES, +}; + +void nsim_devlink_setup(struct netdevsim *ns); +void nsim_devlink_teardown(struct netdevsim *ns); + +int nsim_devlink_init(void); +void nsim_devlink_exit(void); + +int nsim_fib_init(void); +void nsim_fib_exit(void); +u64 nsim_fib_get_val(struct net *net, enum nsim_resource_id res_id, bool max); +int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val); +#else +static inline void nsim_devlink_setup(struct netdevsim *ns) +{ +} + +static inline void nsim_devlink_teardown(struct netdevsim *ns) +{ +} + +static inline int nsim_devlink_init(void) +{ + return 0; +} + +static inline void nsim_devlink_exit(void) +{ +} +#endif + static inline struct netdevsim *to_nsim(struct device *ptr) { return container_of(ptr, struct netdevsim, dev); |