diff options
Diffstat (limited to 'kernel/net/switchdev')
| -rw-r--r-- | kernel/net/switchdev/Kconfig | 13 | ||||
| -rw-r--r-- | kernel/net/switchdev/Makefile | 5 | ||||
| -rw-r--r-- | kernel/net/switchdev/switchdev.c | 404 |
3 files changed, 422 insertions, 0 deletions
diff --git a/kernel/net/switchdev/Kconfig b/kernel/net/switchdev/Kconfig new file mode 100644 index 000000000..86a47e17c --- /dev/null +++ b/kernel/net/switchdev/Kconfig @@ -0,0 +1,13 @@ +# +# Configuration for Switch device support +# + +config NET_SWITCHDEV + bool "Switch (and switch-ish) device support (EXPERIMENTAL)" + depends on INET + ---help--- + This module provides glue between core networking code and device + drivers in order to support hardware switch chips in very generic + meaning of the word "switch". This include devices supporting L2/L3 but + also various flow offloading chips, including switches embedded into + SR-IOV NICs. diff --git a/kernel/net/switchdev/Makefile b/kernel/net/switchdev/Makefile new file mode 100644 index 000000000..5ed63ed32 --- /dev/null +++ b/kernel/net/switchdev/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for the Switch device API +# + +obj-$(CONFIG_NET_SWITCHDEV) += switchdev.o diff --git a/kernel/net/switchdev/switchdev.c b/kernel/net/switchdev/switchdev.c new file mode 100644 index 000000000..055453d48 --- /dev/null +++ b/kernel/net/switchdev/switchdev.c @@ -0,0 +1,404 @@ +/* + * net/switchdev/switchdev.c - Switch device API + * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us> + * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/mutex.h> +#include <linux/notifier.h> +#include <linux/netdevice.h> +#include <net/ip_fib.h> +#include <net/switchdev.h> + +/** + * netdev_switch_parent_id_get - Get ID of a switch + * @dev: port device + * @psid: switch ID + * + * Get ID of a switch this port is part of. + */ +int netdev_switch_parent_id_get(struct net_device *dev, + struct netdev_phys_item_id *psid) +{ + const struct swdev_ops *ops = dev->swdev_ops; + + if (!ops || !ops->swdev_parent_id_get) + return -EOPNOTSUPP; + return ops->swdev_parent_id_get(dev, psid); +} +EXPORT_SYMBOL_GPL(netdev_switch_parent_id_get); + +/** + * netdev_switch_port_stp_update - Notify switch device port of STP + * state change + * @dev: port device + * @state: port STP state + * + * Notify switch device port of bridge port STP state change. + */ +int netdev_switch_port_stp_update(struct net_device *dev, u8 state) +{ + const struct swdev_ops *ops = dev->swdev_ops; + struct net_device *lower_dev; + struct list_head *iter; + int err = -EOPNOTSUPP; + + if (ops && ops->swdev_port_stp_update) + return ops->swdev_port_stp_update(dev, state); + + netdev_for_each_lower_dev(dev, lower_dev, iter) { + err = netdev_switch_port_stp_update(lower_dev, state); + if (err && err != -EOPNOTSUPP) + return err; + } + + return err; +} +EXPORT_SYMBOL_GPL(netdev_switch_port_stp_update); + +static DEFINE_MUTEX(netdev_switch_mutex); +static RAW_NOTIFIER_HEAD(netdev_switch_notif_chain); + +/** + * register_netdev_switch_notifier - Register notifier + * @nb: notifier_block + * + * Register switch device notifier. This should be used by code + * which needs to monitor events happening in particular device. + * Return values are same as for atomic_notifier_chain_register(). + */ +int register_netdev_switch_notifier(struct notifier_block *nb) +{ + int err; + + mutex_lock(&netdev_switch_mutex); + err = raw_notifier_chain_register(&netdev_switch_notif_chain, nb); + mutex_unlock(&netdev_switch_mutex); + return err; +} +EXPORT_SYMBOL_GPL(register_netdev_switch_notifier); + +/** + * unregister_netdev_switch_notifier - Unregister notifier + * @nb: notifier_block + * + * Unregister switch device notifier. + * Return values are same as for atomic_notifier_chain_unregister(). + */ +int unregister_netdev_switch_notifier(struct notifier_block *nb) +{ + int err; + + mutex_lock(&netdev_switch_mutex); + err = raw_notifier_chain_unregister(&netdev_switch_notif_chain, nb); + mutex_unlock(&netdev_switch_mutex); + return err; +} +EXPORT_SYMBOL_GPL(unregister_netdev_switch_notifier); + +/** + * call_netdev_switch_notifiers - Call notifiers + * @val: value passed unmodified to notifier function + * @dev: port device + * @info: notifier information data + * + * Call all network notifier blocks. This should be called by driver + * when it needs to propagate hardware event. + * Return values are same as for atomic_notifier_call_chain(). + */ +int call_netdev_switch_notifiers(unsigned long val, struct net_device *dev, + struct netdev_switch_notifier_info *info) +{ + int err; + + info->dev = dev; + mutex_lock(&netdev_switch_mutex); + err = raw_notifier_call_chain(&netdev_switch_notif_chain, val, info); + mutex_unlock(&netdev_switch_mutex); + return err; +} +EXPORT_SYMBOL_GPL(call_netdev_switch_notifiers); + +/** + * netdev_switch_port_bridge_setlink - Notify switch device port of bridge + * port attributes + * + * @dev: port device + * @nlh: netlink msg with bridge port attributes + * @flags: bridge setlink flags + * + * Notify switch device port of bridge port attributes + */ +int netdev_switch_port_bridge_setlink(struct net_device *dev, + struct nlmsghdr *nlh, u16 flags) +{ + const struct net_device_ops *ops = dev->netdev_ops; + + if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD)) + return 0; + + if (!ops->ndo_bridge_setlink) + return -EOPNOTSUPP; + + return ops->ndo_bridge_setlink(dev, nlh, flags); +} +EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_setlink); + +/** + * netdev_switch_port_bridge_dellink - Notify switch device port of bridge + * port attribute delete + * + * @dev: port device + * @nlh: netlink msg with bridge port attributes + * @flags: bridge setlink flags + * + * Notify switch device port of bridge port attribute delete + */ +int netdev_switch_port_bridge_dellink(struct net_device *dev, + struct nlmsghdr *nlh, u16 flags) +{ + const struct net_device_ops *ops = dev->netdev_ops; + + if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD)) + return 0; + + if (!ops->ndo_bridge_dellink) + return -EOPNOTSUPP; + + return ops->ndo_bridge_dellink(dev, nlh, flags); +} +EXPORT_SYMBOL_GPL(netdev_switch_port_bridge_dellink); + +/** + * ndo_dflt_netdev_switch_port_bridge_setlink - default ndo bridge setlink + * op for master devices + * + * @dev: port device + * @nlh: netlink msg with bridge port attributes + * @flags: bridge setlink flags + * + * Notify master device slaves of bridge port attributes + */ +int ndo_dflt_netdev_switch_port_bridge_setlink(struct net_device *dev, + struct nlmsghdr *nlh, u16 flags) +{ + struct net_device *lower_dev; + struct list_head *iter; + int ret = 0, err = 0; + + if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD)) + return ret; + + netdev_for_each_lower_dev(dev, lower_dev, iter) { + err = netdev_switch_port_bridge_setlink(lower_dev, nlh, flags); + if (err && err != -EOPNOTSUPP) + ret = err; + } + + return ret; +} +EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_setlink); + +/** + * ndo_dflt_netdev_switch_port_bridge_dellink - default ndo bridge dellink + * op for master devices + * + * @dev: port device + * @nlh: netlink msg with bridge port attributes + * @flags: bridge dellink flags + * + * Notify master device slaves of bridge port attribute deletes + */ +int ndo_dflt_netdev_switch_port_bridge_dellink(struct net_device *dev, + struct nlmsghdr *nlh, u16 flags) +{ + struct net_device *lower_dev; + struct list_head *iter; + int ret = 0, err = 0; + + if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD)) + return ret; + + netdev_for_each_lower_dev(dev, lower_dev, iter) { + err = netdev_switch_port_bridge_dellink(lower_dev, nlh, flags); + if (err && err != -EOPNOTSUPP) + ret = err; + } + + return ret; +} +EXPORT_SYMBOL_GPL(ndo_dflt_netdev_switch_port_bridge_dellink); + +static struct net_device *netdev_switch_get_lowest_dev(struct net_device *dev) +{ + const struct swdev_ops *ops = dev->swdev_ops; + struct net_device *lower_dev; + struct net_device *port_dev; + struct list_head *iter; + + /* Recusively search down until we find a sw port dev. + * (A sw port dev supports swdev_parent_id_get). + */ + + if (dev->features & NETIF_F_HW_SWITCH_OFFLOAD && + ops && ops->swdev_parent_id_get) + return dev; + + netdev_for_each_lower_dev(dev, lower_dev, iter) { + port_dev = netdev_switch_get_lowest_dev(lower_dev); + if (port_dev) + return port_dev; + } + + return NULL; +} + +static struct net_device *netdev_switch_get_dev_by_nhs(struct fib_info *fi) +{ + struct netdev_phys_item_id psid; + struct netdev_phys_item_id prev_psid; + struct net_device *dev = NULL; + int nhsel; + + /* For this route, all nexthop devs must be on the same switch. */ + + for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) { + const struct fib_nh *nh = &fi->fib_nh[nhsel]; + + if (!nh->nh_dev) + return NULL; + + dev = netdev_switch_get_lowest_dev(nh->nh_dev); + if (!dev) + return NULL; + + if (netdev_switch_parent_id_get(dev, &psid)) + return NULL; + + if (nhsel > 0) { + if (prev_psid.id_len != psid.id_len) + return NULL; + if (memcmp(prev_psid.id, psid.id, psid.id_len)) + return NULL; + } + + prev_psid = psid; + } + + return dev; +} + +/** + * netdev_switch_fib_ipv4_add - Add IPv4 route entry to switch + * + * @dst: route's IPv4 destination address + * @dst_len: destination address length (prefix length) + * @fi: route FIB info structure + * @tos: route TOS + * @type: route type + * @nlflags: netlink flags passed in (NLM_F_*) + * @tb_id: route table ID + * + * Add IPv4 route entry to switch device. + */ +int netdev_switch_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi, + u8 tos, u8 type, u32 nlflags, u32 tb_id) +{ + struct net_device *dev; + const struct swdev_ops *ops; + int err = 0; + + /* Don't offload route if using custom ip rules or if + * IPv4 FIB offloading has been disabled completely. + */ + +#ifdef CONFIG_IP_MULTIPLE_TABLES + if (fi->fib_net->ipv4.fib_has_custom_rules) + return 0; +#endif + + if (fi->fib_net->ipv4.fib_offload_disabled) + return 0; + + dev = netdev_switch_get_dev_by_nhs(fi); + if (!dev) + return 0; + ops = dev->swdev_ops; + + if (ops->swdev_fib_ipv4_add) { + err = ops->swdev_fib_ipv4_add(dev, htonl(dst), dst_len, + fi, tos, type, nlflags, + tb_id); + if (!err) + fi->fib_flags |= RTNH_F_OFFLOAD; + } + + return err; +} +EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_add); + +/** + * netdev_switch_fib_ipv4_del - Delete IPv4 route entry from switch + * + * @dst: route's IPv4 destination address + * @dst_len: destination address length (prefix length) + * @fi: route FIB info structure + * @tos: route TOS + * @type: route type + * @tb_id: route table ID + * + * Delete IPv4 route entry from switch device. + */ +int netdev_switch_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi, + u8 tos, u8 type, u32 tb_id) +{ + struct net_device *dev; + const struct swdev_ops *ops; + int err = 0; + + if (!(fi->fib_flags & RTNH_F_OFFLOAD)) + return 0; + + dev = netdev_switch_get_dev_by_nhs(fi); + if (!dev) + return 0; + ops = dev->swdev_ops; + + if (ops->swdev_fib_ipv4_del) { + err = ops->swdev_fib_ipv4_del(dev, htonl(dst), dst_len, + fi, tos, type, tb_id); + if (!err) + fi->fib_flags &= ~RTNH_F_OFFLOAD; + } + + return err; +} +EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_del); + +/** + * netdev_switch_fib_ipv4_abort - Abort an IPv4 FIB operation + * + * @fi: route FIB info structure + */ +void netdev_switch_fib_ipv4_abort(struct fib_info *fi) +{ + /* There was a problem installing this route to the offload + * device. For now, until we come up with more refined + * policy handling, abruptly end IPv4 fib offloading for + * for entire net by flushing offload device(s) of all + * IPv4 routes, and mark IPv4 fib offloading broken from + * this point forward. + */ + + fib_flush_external(fi->fib_net); + fi->fib_net->ipv4.fib_offload_disabled = true; +} +EXPORT_SYMBOL_GPL(netdev_switch_fib_ipv4_abort); |