From eeeaaf185eca5790529fa184c89452ead7c8c859 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 17 Jul 2018 10:53:20 -0700 Subject: [PATCH] netdevsim: add shared netdevsim devices Factor out sharable netdevsim sub-object and use IFLA_LINK to link netdevsims together at creation time. Sharable object will have its own DebugFS directory. Signed-off-by: Jakub Kicinski Reviewed-by: Quentin Monnet Signed-off-by: Daniel Borkmann --- drivers/net/netdevsim/netdev.c | 87 ++++++++++++++++++++++++++++--- drivers/net/netdevsim/netdevsim.h | 10 +++- 2 files changed, 90 insertions(+), 7 deletions(-) diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index 9125637ef5d8..2d244551298b 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -152,8 +152,8 @@ nsim_port_attr_get(struct net_device *dev, struct switchdev_attr *attr) switch (attr->id) { case SWITCHDEV_ATTR_ID_PORT_PARENT_ID: - attr->u.ppid.id_len = sizeof(ns->switch_id); - memcpy(&attr->u.ppid.id, &ns->switch_id, + attr->u.ppid.id_len = sizeof(ns->sdev->switch_id); + memcpy(&attr->u.ppid.id, &ns->sdev->switch_id, attr->u.ppid.id_len); return 0; default: @@ -167,19 +167,41 @@ static const struct switchdev_ops nsim_switchdev_ops = { static int nsim_init(struct net_device *dev) { + char sdev_ddir_name[10], sdev_link_name[32]; struct netdevsim *ns = netdev_priv(dev); int err; ns->netdev = dev; - ns->switch_id = nsim_dev_id; - ns->ddir = debugfs_create_dir(netdev_name(dev), nsim_ddir); if (IS_ERR_OR_NULL(ns->ddir)) return -ENOMEM; + if (!ns->sdev) { + ns->sdev = kzalloc(sizeof(*ns->sdev), GFP_KERNEL); + if (!ns->sdev) { + err = -ENOMEM; + goto err_debugfs_destroy; + } + ns->sdev->refcnt = 1; + ns->sdev->switch_id = nsim_dev_id; + sprintf(sdev_ddir_name, "%u", ns->sdev->switch_id); + ns->sdev->ddir = debugfs_create_dir(sdev_ddir_name, + nsim_sdev_ddir); + if (IS_ERR_OR_NULL(ns->sdev->ddir)) { + err = PTR_ERR_OR_ZERO(ns->sdev->ddir) ?: -EINVAL; + goto err_sdev_free; + } + } else { + sprintf(sdev_ddir_name, "%u", ns->sdev->switch_id); + ns->sdev->refcnt++; + } + + sprintf(sdev_link_name, "../../" DRV_NAME "_sdev/%s", sdev_ddir_name); + debugfs_create_symlink("sdev", ns->ddir, sdev_link_name); + err = nsim_bpf_init(ns); if (err) - goto err_debugfs_destroy; + goto err_sdev_destroy; ns->dev.id = nsim_dev_id++; ns->dev.bus = &nsim_bus; @@ -203,6 +225,12 @@ err_unreg_dev: device_unregister(&ns->dev); err_bpf_uninit: nsim_bpf_uninit(ns); +err_sdev_destroy: + if (!--ns->sdev->refcnt) { + debugfs_remove_recursive(ns->sdev->ddir); +err_sdev_free: + kfree(ns->sdev); + } err_debugfs_destroy: debugfs_remove_recursive(ns->ddir); return err; @@ -216,6 +244,10 @@ static void nsim_uninit(struct net_device *dev) nsim_devlink_teardown(ns); debugfs_remove_recursive(ns->ddir); nsim_bpf_uninit(ns); + if (!--ns->sdev->refcnt) { + debugfs_remove_recursive(ns->sdev->ddir); + kfree(ns->sdev); + } } static void nsim_free(struct net_device *dev) @@ -494,14 +526,48 @@ static int nsim_validate(struct nlattr *tb[], struct nlattr *data[], return 0; } +static int nsim_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + struct netdevsim *ns = netdev_priv(dev); + + if (tb[IFLA_LINK]) { + struct net_device *joindev; + struct netdevsim *joinns; + + joindev = __dev_get_by_index(src_net, + nla_get_u32(tb[IFLA_LINK])); + if (!joindev) + return -ENODEV; + if (joindev->netdev_ops != &nsim_netdev_ops) + return -EINVAL; + + joinns = netdev_priv(joindev); + if (!joinns->sdev || !joinns->sdev->refcnt) + return -EINVAL; + ns->sdev = joinns->sdev; + } + + return register_netdevice(dev); +} + +static void nsim_dellink(struct net_device *dev, struct list_head *head) +{ + unregister_netdevice_queue(dev, head); +} + static struct rtnl_link_ops nsim_link_ops __read_mostly = { .kind = DRV_NAME, .priv_size = sizeof(struct netdevsim), .setup = nsim_setup, .validate = nsim_validate, + .newlink = nsim_newlink, + .dellink = nsim_dellink, }; struct dentry *nsim_ddir; +struct dentry *nsim_sdev_ddir; static int __init nsim_module_init(void) { @@ -511,9 +577,15 @@ static int __init nsim_module_init(void) if (IS_ERR_OR_NULL(nsim_ddir)) return -ENOMEM; + nsim_sdev_ddir = debugfs_create_dir(DRV_NAME "_sdev", NULL); + if (IS_ERR_OR_NULL(nsim_sdev_ddir)) { + err = -ENOMEM; + goto err_debugfs_destroy; + } + err = bus_register(&nsim_bus); if (err) - goto err_debugfs_destroy; + goto err_sdir_destroy; err = nsim_devlink_init(); if (err) @@ -529,6 +601,8 @@ err_dl_fini: nsim_devlink_exit(); err_unreg_bus: bus_unregister(&nsim_bus); +err_sdir_destroy: + debugfs_remove_recursive(nsim_sdev_ddir); err_debugfs_destroy: debugfs_remove_recursive(nsim_ddir); return err; @@ -539,6 +613,7 @@ static void __exit nsim_module_exit(void) rtnl_link_unregister(&nsim_link_ops); nsim_devlink_exit(); bus_unregister(&nsim_bus); + debugfs_remove_recursive(nsim_sdev_ddir); debugfs_remove_recursive(nsim_ddir); } diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index e2f232325259..8743ce74d2d9 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -30,6 +30,13 @@ struct bpf_prog; struct dentry; struct nsim_vf_config; +struct netdevsim_shared_dev { + unsigned int refcnt; + u32 switch_id; + + struct dentry *ddir; +}; + #define NSIM_IPSEC_MAX_SA_COUNT 33 #define NSIM_IPSEC_VALID BIT(31) @@ -59,7 +66,7 @@ struct netdevsim { struct u64_stats_sync syncp; struct device dev; - u32 switch_id; + struct netdevsim_shared_dev *sdev; struct dentry *ddir; @@ -93,6 +100,7 @@ struct netdevsim { }; extern struct dentry *nsim_ddir; +extern struct dentry *nsim_sdev_ddir; #ifdef CONFIG_BPF_SYSCALL int nsim_bpf_init(struct netdevsim *ns);