diff options
Diffstat (limited to 'drivers/net/netdevsim')
| -rw-r--r-- | drivers/net/netdevsim/Makefile | 15 | ||||
| -rw-r--r-- | drivers/net/netdevsim/bpf.c | 657 | ||||
| -rw-r--r-- | drivers/net/netdevsim/bus.c | 398 | ||||
| -rw-r--r-- | drivers/net/netdevsim/dev.c | 1231 | ||||
| -rw-r--r-- | drivers/net/netdevsim/ethtool.c | 64 | ||||
| -rw-r--r-- | drivers/net/netdevsim/fib.c | 957 | ||||
| -rw-r--r-- | drivers/net/netdevsim/health.c | 320 | ||||
| -rw-r--r-- | drivers/net/netdevsim/ipsec.c | 299 | ||||
| -rw-r--r-- | drivers/net/netdevsim/netdev.c | 396 | ||||
| -rw-r--r-- | drivers/net/netdevsim/netdevsim.h | 293 | ||||
| -rw-r--r-- | drivers/net/netdevsim/udp_tunnels.c | 217 |
11 files changed, 4847 insertions, 0 deletions
diff --git a/drivers/net/netdevsim/Makefile b/drivers/net/netdevsim/Makefile new file mode 100644 index 000000000..ade086eed --- /dev/null +++ b/drivers/net/netdevsim/Makefile @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_NETDEVSIM) += netdevsim.o + +netdevsim-objs := \ + netdev.o dev.o ethtool.o fib.o bus.o health.o udp_tunnels.o + +ifeq ($(CONFIG_BPF_SYSCALL),y) +netdevsim-objs += \ + bpf.o +endif + +ifneq ($(CONFIG_XFRM_OFFLOAD),) +netdevsim-objs += ipsec.o +endif diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c new file mode 100644 index 000000000..508542658 --- /dev/null +++ b/drivers/net/netdevsim/bpf.c @@ -0,0 +1,657 @@ +/* + * Copyright (C) 2017 Netronome Systems, Inc. + * + * 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/bpf.h> +#include <linux/bpf_verifier.h> +#include <linux/debugfs.h> +#include <linux/kernel.h> +#include <linux/mutex.h> +#include <linux/rtnetlink.h> +#include <net/pkt_cls.h> + +#include "netdevsim.h" + +#define pr_vlog(env, fmt, ...) \ + bpf_verifier_log_write(env, "[netdevsim] " fmt, ##__VA_ARGS__) + +struct nsim_bpf_bound_prog { + struct nsim_dev *nsim_dev; + struct bpf_prog *prog; + struct dentry *ddir; + const char *state; + bool is_loaded; + struct list_head l; +}; + +#define NSIM_BPF_MAX_KEYS 2 + +struct nsim_bpf_bound_map { + struct netdevsim *ns; + struct bpf_offloaded_map *map; + struct mutex mutex; + struct nsim_map_entry { + void *key; + void *value; + } entry[NSIM_BPF_MAX_KEYS]; + struct list_head l; +}; + +static int nsim_bpf_string_show(struct seq_file *file, void *data) +{ + const char **str = file->private; + + if (*str) + seq_printf(file, "%s\n", *str); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(nsim_bpf_string); + +static int +nsim_bpf_verify_insn(struct bpf_verifier_env *env, int insn_idx, int prev_insn) +{ + struct nsim_bpf_bound_prog *state; + int ret = 0; + + state = env->prog->aux->offload->dev_priv; + if (state->nsim_dev->bpf_bind_verifier_delay && !insn_idx) + msleep(state->nsim_dev->bpf_bind_verifier_delay); + + if (insn_idx == env->prog->len - 1) { + pr_vlog(env, "Hello from netdevsim!\n"); + + if (!state->nsim_dev->bpf_bind_verifier_accept) + ret = -EOPNOTSUPP; + } + + return ret; +} + +static int nsim_bpf_finalize(struct bpf_verifier_env *env) +{ + return 0; +} + +static bool nsim_xdp_offload_active(struct netdevsim *ns) +{ + return ns->xdp_hw.prog; +} + +static void nsim_prog_set_loaded(struct bpf_prog *prog, bool loaded) +{ + struct nsim_bpf_bound_prog *state; + + if (!prog || !prog->aux->offload) + return; + + state = prog->aux->offload->dev_priv; + state->is_loaded = loaded; +} + +static int +nsim_bpf_offload(struct netdevsim *ns, struct bpf_prog *prog, bool oldprog) +{ + nsim_prog_set_loaded(ns->bpf_offloaded, false); + + WARN(!!ns->bpf_offloaded != oldprog, + "bad offload state, expected offload %sto be active", + oldprog ? "" : "not "); + ns->bpf_offloaded = prog; + ns->bpf_offloaded_id = prog ? prog->aux->id : 0; + nsim_prog_set_loaded(prog, true); + + return 0; +} + +int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, + void *type_data, void *cb_priv) +{ + struct tc_cls_bpf_offload *cls_bpf = type_data; + struct bpf_prog *prog = cls_bpf->prog; + struct netdevsim *ns = cb_priv; + struct bpf_prog *oldprog; + + if (type != TC_SETUP_CLSBPF) { + NSIM_EA(cls_bpf->common.extack, + "only offload of BPF classifiers supported"); + return -EOPNOTSUPP; + } + + if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common)) + return -EOPNOTSUPP; + + if (cls_bpf->common.protocol != htons(ETH_P_ALL)) { + NSIM_EA(cls_bpf->common.extack, + "only ETH_P_ALL supported as filter protocol"); + return -EOPNOTSUPP; + } + + if (!ns->bpf_tc_accept) { + NSIM_EA(cls_bpf->common.extack, + "netdevsim configured to reject BPF TC offload"); + return -EOPNOTSUPP; + } + /* Note: progs without skip_sw will probably not be dev bound */ + if (prog && !prog->aux->offload && !ns->bpf_tc_non_bound_accept) { + NSIM_EA(cls_bpf->common.extack, + "netdevsim configured to reject unbound programs"); + return -EOPNOTSUPP; + } + + if (cls_bpf->command != TC_CLSBPF_OFFLOAD) + return -EOPNOTSUPP; + + oldprog = cls_bpf->oldprog; + + /* Don't remove if oldprog doesn't match driver's state */ + if (ns->bpf_offloaded != oldprog) { + oldprog = NULL; + if (!cls_bpf->prog) + return 0; + if (ns->bpf_offloaded) { + NSIM_EA(cls_bpf->common.extack, + "driver and netdev offload states mismatch"); + return -EBUSY; + } + } + + return nsim_bpf_offload(ns, cls_bpf->prog, oldprog); +} + +int nsim_bpf_disable_tc(struct netdevsim *ns) +{ + if (ns->bpf_offloaded && !nsim_xdp_offload_active(ns)) + return -EBUSY; + return 0; +} + +static int nsim_xdp_offload_prog(struct netdevsim *ns, struct netdev_bpf *bpf) +{ + if (!nsim_xdp_offload_active(ns) && !bpf->prog) + return 0; + if (!nsim_xdp_offload_active(ns) && bpf->prog && ns->bpf_offloaded) { + NSIM_EA(bpf->extack, "TC program is already loaded"); + return -EBUSY; + } + + return nsim_bpf_offload(ns, bpf->prog, nsim_xdp_offload_active(ns)); +} + +static int +nsim_xdp_set_prog(struct netdevsim *ns, struct netdev_bpf *bpf, + struct xdp_attachment_info *xdp) +{ + int err; + + if (bpf->command == XDP_SETUP_PROG && !ns->bpf_xdpdrv_accept) { + NSIM_EA(bpf->extack, "driver XDP disabled in DebugFS"); + return -EOPNOTSUPP; + } + if (bpf->command == XDP_SETUP_PROG_HW && !ns->bpf_xdpoffload_accept) { + NSIM_EA(bpf->extack, "XDP offload disabled in DebugFS"); + return -EOPNOTSUPP; + } + + if (bpf->command == XDP_SETUP_PROG_HW) { + err = nsim_xdp_offload_prog(ns, bpf); + if (err) + return err; + } + + xdp_attachment_setup(xdp, bpf); + + return 0; +} + +static int nsim_bpf_create_prog(struct nsim_dev *nsim_dev, + struct bpf_prog *prog) +{ + struct nsim_bpf_bound_prog *state; + char name[16]; + int ret; + + state = kzalloc(sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + state->nsim_dev = nsim_dev; + state->prog = prog; + state->state = "verify"; + + /* Program id is not populated yet when we create the state. */ + sprintf(name, "%u", nsim_dev->prog_id_gen++); + state->ddir = debugfs_create_dir(name, nsim_dev->ddir_bpf_bound_progs); + if (IS_ERR(state->ddir)) { + ret = PTR_ERR(state->ddir); + kfree(state); + return ret; + } + + debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id); + debugfs_create_file("state", 0400, state->ddir, + &state->state, &nsim_bpf_string_fops); + debugfs_create_bool("loaded", 0400, state->ddir, &state->is_loaded); + + list_add_tail(&state->l, &nsim_dev->bpf_bound_progs); + + prog->aux->offload->dev_priv = state; + + return 0; +} + +static int nsim_bpf_verifier_prep(struct bpf_prog *prog) +{ + struct nsim_dev *nsim_dev = + bpf_offload_dev_priv(prog->aux->offload->offdev); + + if (!nsim_dev->bpf_bind_accept) + return -EOPNOTSUPP; + + return nsim_bpf_create_prog(nsim_dev, prog); +} + +static int nsim_bpf_translate(struct bpf_prog *prog) +{ + struct nsim_bpf_bound_prog *state = prog->aux->offload->dev_priv; + + state->state = "xlated"; + return 0; +} + +static void nsim_bpf_destroy_prog(struct bpf_prog *prog) +{ + struct nsim_bpf_bound_prog *state; + + state = prog->aux->offload->dev_priv; + WARN(state->is_loaded, + "offload state destroyed while program still bound"); + debugfs_remove_recursive(state->ddir); + list_del(&state->l); + kfree(state); +} + +static const struct bpf_prog_offload_ops nsim_bpf_dev_ops = { + .insn_hook = nsim_bpf_verify_insn, + .finalize = nsim_bpf_finalize, + .prepare = nsim_bpf_verifier_prep, + .translate = nsim_bpf_translate, + .destroy = nsim_bpf_destroy_prog, +}; + +static int nsim_setup_prog_checks(struct netdevsim *ns, struct netdev_bpf *bpf) +{ + if (bpf->prog && bpf->prog->aux->offload) { + NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv"); + return -EINVAL; + } + if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) { + NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled"); + return -EINVAL; + } + return 0; +} + +static int +nsim_setup_prog_hw_checks(struct netdevsim *ns, struct netdev_bpf *bpf) +{ + struct nsim_bpf_bound_prog *state; + + if (!bpf->prog) + return 0; + + if (!bpf->prog->aux->offload) { + NSIM_EA(bpf->extack, "xdpoffload of non-bound program"); + return -EINVAL; + } + if (!bpf_offload_dev_match(bpf->prog, ns->netdev)) { + NSIM_EA(bpf->extack, "program bound to different dev"); + return -EINVAL; + } + + state = bpf->prog->aux->offload->dev_priv; + if (WARN_ON(strcmp(state->state, "xlated"))) { + NSIM_EA(bpf->extack, "offloading program in bad state"); + return -EINVAL; + } + return 0; +} + +static bool +nsim_map_key_match(struct bpf_map *map, struct nsim_map_entry *e, void *key) +{ + return e->key && !memcmp(key, e->key, map->key_size); +} + +static int nsim_map_key_find(struct bpf_offloaded_map *offmap, void *key) +{ + struct nsim_bpf_bound_map *nmap = offmap->dev_priv; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) + if (nsim_map_key_match(&offmap->map, &nmap->entry[i], key)) + return i; + + return -ENOENT; +} + +static int +nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx) +{ + struct nsim_bpf_bound_map *nmap = offmap->dev_priv; + + nmap->entry[idx].key = kmalloc(offmap->map.key_size, + GFP_KERNEL_ACCOUNT | __GFP_NOWARN); + if (!nmap->entry[idx].key) + return -ENOMEM; + nmap->entry[idx].value = kmalloc(offmap->map.value_size, + GFP_KERNEL_ACCOUNT | __GFP_NOWARN); + if (!nmap->entry[idx].value) { + kfree(nmap->entry[idx].key); + nmap->entry[idx].key = NULL; + return -ENOMEM; + } + + return 0; +} + +static int +nsim_map_get_next_key(struct bpf_offloaded_map *offmap, + void *key, void *next_key) +{ + struct nsim_bpf_bound_map *nmap = offmap->dev_priv; + int idx = -ENOENT; + + mutex_lock(&nmap->mutex); + + if (key) + idx = nsim_map_key_find(offmap, key); + if (idx == -ENOENT) + idx = 0; + else + idx++; + + for (; idx < ARRAY_SIZE(nmap->entry); idx++) { + if (nmap->entry[idx].key) { + memcpy(next_key, nmap->entry[idx].key, + offmap->map.key_size); + break; + } + } + + mutex_unlock(&nmap->mutex); + + if (idx == ARRAY_SIZE(nmap->entry)) + return -ENOENT; + return 0; +} + +static int +nsim_map_lookup_elem(struct bpf_offloaded_map *offmap, void *key, void *value) +{ + struct nsim_bpf_bound_map *nmap = offmap->dev_priv; + int idx; + + mutex_lock(&nmap->mutex); + + idx = nsim_map_key_find(offmap, key); + if (idx >= 0) + memcpy(value, nmap->entry[idx].value, offmap->map.value_size); + + mutex_unlock(&nmap->mutex); + + return idx < 0 ? idx : 0; +} + +static int +nsim_map_update_elem(struct bpf_offloaded_map *offmap, + void *key, void *value, u64 flags) +{ + struct nsim_bpf_bound_map *nmap = offmap->dev_priv; + int idx, err = 0; + + mutex_lock(&nmap->mutex); + + idx = nsim_map_key_find(offmap, key); + if (idx < 0 && flags == BPF_EXIST) { + err = idx; + goto exit_unlock; + } + if (idx >= 0 && flags == BPF_NOEXIST) { + err = -EEXIST; + goto exit_unlock; + } + + if (idx < 0) { + for (idx = 0; idx < ARRAY_SIZE(nmap->entry); idx++) + if (!nmap->entry[idx].key) + break; + if (idx == ARRAY_SIZE(nmap->entry)) { + err = -E2BIG; + goto exit_unlock; + } + + err = nsim_map_alloc_elem(offmap, idx); + if (err) + goto exit_unlock; + } + + memcpy(nmap->entry[idx].key, key, offmap->map.key_size); + memcpy(nmap->entry[idx].value, value, offmap->map.value_size); +exit_unlock: + mutex_unlock(&nmap->mutex); + + return err; +} + +static int nsim_map_delete_elem(struct bpf_offloaded_map *offmap, void *key) +{ + struct nsim_bpf_bound_map *nmap = offmap->dev_priv; + int idx; + + if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) + return -EINVAL; + + mutex_lock(&nmap->mutex); + + idx = nsim_map_key_find(offmap, key); + if (idx >= 0) { + kfree(nmap->entry[idx].key); + kfree(nmap->entry[idx].value); + memset(&nmap->entry[idx], 0, sizeof(nmap->entry[idx])); + } + + mutex_unlock(&nmap->mutex); + + return idx < 0 ? idx : 0; +} + +static const struct bpf_map_dev_ops nsim_bpf_map_ops = { + .map_get_next_key = nsim_map_get_next_key, + .map_lookup_elem = nsim_map_lookup_elem, + .map_update_elem = nsim_map_update_elem, + .map_delete_elem = nsim_map_delete_elem, +}; + +static int +nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap) +{ + struct nsim_bpf_bound_map *nmap; + int i, err; + + if (WARN_ON(offmap->map.map_type != BPF_MAP_TYPE_ARRAY && + offmap->map.map_type != BPF_MAP_TYPE_HASH)) + return -EINVAL; + if (offmap->map.max_entries > NSIM_BPF_MAX_KEYS) + return -ENOMEM; + if (offmap->map.map_flags) + return -EINVAL; + + nmap = kzalloc(sizeof(*nmap), GFP_KERNEL_ACCOUNT); + if (!nmap) + return -ENOMEM; + + offmap->dev_priv = nmap; + nmap->ns = ns; + nmap->map = offmap; + mutex_init(&nmap->mutex); + + if (offmap->map.map_type == BPF_MAP_TYPE_ARRAY) { + for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) { + u32 *key; + + err = nsim_map_alloc_elem(offmap, i); + if (err) + goto err_free; + key = nmap->entry[i].key; + *key = i; + memset(nmap->entry[i].value, 0, offmap->map.value_size); + } + } + + offmap->dev_ops = &nsim_bpf_map_ops; + list_add_tail(&nmap->l, &ns->nsim_dev->bpf_bound_maps); + + return 0; + +err_free: + while (--i >= 0) { + kfree(nmap->entry[i].key); + kfree(nmap->entry[i].value); + } + kfree(nmap); + return err; +} + +static void nsim_bpf_map_free(struct bpf_offloaded_map *offmap) +{ + struct nsim_bpf_bound_map *nmap = offmap->dev_priv; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(nmap->entry); i++) { + kfree(nmap->entry[i].key); + kfree(nmap->entry[i].value); + } + list_del_init(&nmap->l); + mutex_destroy(&nmap->mutex); + kfree(nmap); +} + +int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf) +{ + struct netdevsim *ns = netdev_priv(dev); + int err; + + ASSERT_RTNL(); + + switch (bpf->command) { + case XDP_SETUP_PROG: + err = nsim_setup_prog_checks(ns, bpf); + if (err) + return err; + + return nsim_xdp_set_prog(ns, bpf, &ns->xdp); + case XDP_SETUP_PROG_HW: + err = nsim_setup_prog_hw_checks(ns, bpf); + if (err) + return err; + + return nsim_xdp_set_prog(ns, bpf, &ns->xdp_hw); + case BPF_OFFLOAD_MAP_ALLOC: + if (!ns->bpf_map_accept) + return -EOPNOTSUPP; + + return nsim_bpf_map_alloc(ns, bpf->offmap); + case BPF_OFFLOAD_MAP_FREE: + nsim_bpf_map_free(bpf->offmap); + return 0; + default: + return -EINVAL; + } +} + +int nsim_bpf_dev_init(struct nsim_dev *nsim_dev) +{ + int err; + + INIT_LIST_HEAD(&nsim_dev->bpf_bound_progs); + INIT_LIST_HEAD(&nsim_dev->bpf_bound_maps); + + nsim_dev->ddir_bpf_bound_progs = debugfs_create_dir("bpf_bound_progs", + nsim_dev->ddir); + if (IS_ERR(nsim_dev->ddir_bpf_bound_progs)) + return PTR_ERR(nsim_dev->ddir_bpf_bound_progs); + + nsim_dev->bpf_dev = bpf_offload_dev_create(&nsim_bpf_dev_ops, nsim_dev); + err = PTR_ERR_OR_ZERO(nsim_dev->bpf_dev); + if (err) + return err; + + nsim_dev->bpf_bind_accept = true; + debugfs_create_bool("bpf_bind_accept", 0600, nsim_dev->ddir, + &nsim_dev->bpf_bind_accept); + debugfs_create_u32("bpf_bind_verifier_delay", 0600, nsim_dev->ddir, + &nsim_dev->bpf_bind_verifier_delay); + nsim_dev->bpf_bind_verifier_accept = true; + debugfs_create_bool("bpf_bind_verifier_accept", 0600, nsim_dev->ddir, + &nsim_dev->bpf_bind_verifier_accept); + return 0; +} + +void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev) +{ + WARN_ON(!list_empty(&nsim_dev->bpf_bound_progs)); + WARN_ON(!list_empty(&nsim_dev->bpf_bound_maps)); + bpf_offload_dev_destroy(nsim_dev->bpf_dev); +} + +int nsim_bpf_init(struct netdevsim *ns) +{ + struct dentry *ddir = ns->nsim_dev_port->ddir; + int err; + + err = bpf_offload_dev_netdev_register(ns->nsim_dev->bpf_dev, + ns->netdev); + if (err) + return err; + + debugfs_create_u32("bpf_offloaded_id", 0400, ddir, + &ns->bpf_offloaded_id); + + ns->bpf_tc_accept = true; + debugfs_create_bool("bpf_tc_accept", 0600, ddir, + &ns->bpf_tc_accept); + debugfs_create_bool("bpf_tc_non_bound_accept", 0600, ddir, + &ns->bpf_tc_non_bound_accept); + ns->bpf_xdpdrv_accept = true; + debugfs_create_bool("bpf_xdpdrv_accept", 0600, ddir, + &ns->bpf_xdpdrv_accept); + ns->bpf_xdpoffload_accept = true; + debugfs_create_bool("bpf_xdpoffload_accept", 0600, ddir, + &ns->bpf_xdpoffload_accept); + + ns->bpf_map_accept = true; + debugfs_create_bool("bpf_map_accept", 0600, ddir, + &ns->bpf_map_accept); + + return 0; +} + +void nsim_bpf_uninit(struct netdevsim *ns) +{ + WARN_ON(ns->xdp.prog); + WARN_ON(ns->xdp_hw.prog); + WARN_ON(ns->bpf_offloaded); + bpf_offload_dev_netdev_unregister(ns->nsim_dev->bpf_dev, ns->netdev); +} diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c new file mode 100644 index 000000000..0e9511661 --- /dev/null +++ b/drivers/net/netdevsim/bus.c @@ -0,0 +1,398 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2017 Netronome Systems, Inc. + * Copyright (C) 2019 Mellanox Technologies. All rights reserved + */ + +#include <linux/device.h> +#include <linux/idr.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/rtnetlink.h> +#include <linux/slab.h> +#include <linux/sysfs.h> + +#include "netdevsim.h" + +static DEFINE_IDA(nsim_bus_dev_ids); +static LIST_HEAD(nsim_bus_dev_list); +static DEFINE_MUTEX(nsim_bus_dev_list_lock); +static bool nsim_bus_enable; + +static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev) +{ + return container_of(dev, struct nsim_bus_dev, dev); +} + +static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev, + unsigned int num_vfs) +{ + nsim_bus_dev->vfconfigs = kcalloc(num_vfs, + sizeof(struct nsim_vf_config), + GFP_KERNEL | __GFP_NOWARN); + if (!nsim_bus_dev->vfconfigs) + return -ENOMEM; + nsim_bus_dev->num_vfs = num_vfs; + + return 0; +} + +static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev) +{ + kfree(nsim_bus_dev->vfconfigs); + nsim_bus_dev->vfconfigs = NULL; + nsim_bus_dev->num_vfs = 0; +} + +static ssize_t +nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + unsigned int num_vfs; + int ret; + + ret = kstrtouint(buf, 0, &num_vfs); + if (ret) + return ret; + + rtnl_lock(); + if (nsim_bus_dev->num_vfs == num_vfs) + goto exit_good; + if (nsim_bus_dev->num_vfs && num_vfs) { + ret = -EBUSY; + goto exit_unlock; + } + + if (num_vfs) { + ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs); + if (ret) + goto exit_unlock; + } else { + nsim_bus_dev_vfs_disable(nsim_bus_dev); + } +exit_good: + ret = count; +exit_unlock: + rtnl_unlock(); + + return ret; +} + +static ssize_t +nsim_bus_dev_numvfs_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + + return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs); +} + +static struct device_attribute nsim_bus_dev_numvfs_attr = + __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show, + nsim_bus_dev_numvfs_store); + +static ssize_t +new_port_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + struct nsim_dev *nsim_dev = dev_get_drvdata(dev); + struct devlink *devlink; + unsigned int port_index; + int ret; + + /* Prevent to use nsim_bus_dev before initialization. */ + if (!smp_load_acquire(&nsim_bus_dev->init)) + return -EBUSY; + ret = kstrtouint(buf, 0, &port_index); + if (ret) + return ret; + + devlink = priv_to_devlink(nsim_dev); + + mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock); + devlink_reload_disable(devlink); + ret = nsim_dev_port_add(nsim_bus_dev, port_index); + devlink_reload_enable(devlink); + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); + return ret ? ret : count; +} + +static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port); + +static ssize_t +del_port_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + struct nsim_dev *nsim_dev = dev_get_drvdata(dev); + struct devlink *devlink; + unsigned int port_index; + int ret; + + /* Prevent to use nsim_bus_dev before initialization. */ + if (!smp_load_acquire(&nsim_bus_dev->init)) + return -EBUSY; + ret = kstrtouint(buf, 0, &port_index); + if (ret) + return ret; + + devlink = priv_to_devlink(nsim_dev); + + mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock); + devlink_reload_disable(devlink); + ret = nsim_dev_port_del(nsim_bus_dev, port_index); + devlink_reload_enable(devlink); + mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock); + return ret ? ret : count; +} + +static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port); + +static struct attribute *nsim_bus_dev_attrs[] = { + &nsim_bus_dev_numvfs_attr.attr, + &nsim_bus_dev_new_port_attr.attr, + &nsim_bus_dev_del_port_attr.attr, + NULL, +}; + +static const struct attribute_group nsim_bus_dev_attr_group = { + .attrs = nsim_bus_dev_attrs, +}; + +static const struct attribute_group *nsim_bus_dev_attr_groups[] = { + &nsim_bus_dev_attr_group, + NULL, +}; + +static void nsim_bus_dev_release(struct device *dev) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + + nsim_bus_dev_vfs_disable(nsim_bus_dev); +} + +static struct device_type nsim_bus_dev_type = { + .groups = nsim_bus_dev_attr_groups, + .release = nsim_bus_dev_release, +}; + +static struct nsim_bus_dev * +nsim_bus_dev_new(unsigned int id, unsigned int port_count); + +static ssize_t +new_device_store(struct bus_type *bus, const char *buf, size_t count) +{ + struct nsim_bus_dev *nsim_bus_dev; + unsigned int port_count; + unsigned int id; + int err; + + err = sscanf(buf, "%u %u", &id, &port_count); + switch (err) { + case 1: + port_count = 1; + fallthrough; + case 2: + if (id > INT_MAX) { + pr_err("Value of \"id\" is too big.\n"); + return -EINVAL; + } + break; + default: + pr_err("Format for adding new device is \"id port_count\" (uint uint).\n"); + return -EINVAL; + } + + mutex_lock(&nsim_bus_dev_list_lock); + /* Prevent to use resource before initialization. */ + if (!smp_load_acquire(&nsim_bus_enable)) { + err = -EBUSY; + goto err; + } + + nsim_bus_dev = nsim_bus_dev_new(id, port_count); + if (IS_ERR(nsim_bus_dev)) { + err = PTR_ERR(nsim_bus_dev); + goto err; + } + + /* Allow using nsim_bus_dev */ + smp_store_release(&nsim_bus_dev->init, true); + + list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list); + mutex_unlock(&nsim_bus_dev_list_lock); + + return count; +err: + mutex_unlock(&nsim_bus_dev_list_lock); + return err; +} +static BUS_ATTR_WO(new_device); + +static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev); + +static ssize_t +del_device_store(struct bus_type *bus, const char *buf, size_t count) +{ + struct nsim_bus_dev *nsim_bus_dev, *tmp; + unsigned int id; + int err; + + err = sscanf(buf, "%u", &id); + switch (err) { + case 1: + if (id > INT_MAX) { + pr_err("Value of \"id\" is too big.\n"); + return -EINVAL; + } + break; + default: + pr_err("Format for deleting device is \"id\" (uint).\n"); + return -EINVAL; + } + + err = -ENOENT; + mutex_lock(&nsim_bus_dev_list_lock); + /* Prevent to use resource before initialization. */ + if (!smp_load_acquire(&nsim_bus_enable)) { + mutex_unlock(&nsim_bus_dev_list_lock); + return -EBUSY; + } + list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) { + if (nsim_bus_dev->dev.id != id) + continue; + list_del(&nsim_bus_dev->list); + nsim_bus_dev_del(nsim_bus_dev); + err = 0; + break; + } + mutex_unlock(&nsim_bus_dev_list_lock); + return !err ? count : err; +} +static BUS_ATTR_WO(del_device); + +static struct attribute *nsim_bus_attrs[] = { + &bus_attr_new_device.attr, + &bus_attr_del_device.attr, + NULL +}; +ATTRIBUTE_GROUPS(nsim_bus); + +static int nsim_bus_probe(struct device *dev) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + + return nsim_dev_probe(nsim_bus_dev); +} + +static int nsim_bus_remove(struct device *dev) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + + nsim_dev_remove(nsim_bus_dev); + return 0; +} + +static int nsim_num_vf(struct device *dev) +{ + struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev); + + return nsim_bus_dev->num_vfs; +} + +static struct bus_type nsim_bus = { + .name = DRV_NAME, + .dev_name = DRV_NAME, + .bus_groups = nsim_bus_groups, + .probe = nsim_bus_probe, + .remove = nsim_bus_remove, + .num_vf = nsim_num_vf, +}; + +static struct nsim_bus_dev * +nsim_bus_dev_new(unsigned int id, unsigned int port_count) +{ + struct nsim_bus_dev *nsim_bus_dev; + int err; + + nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL); + if (!nsim_bus_dev) + return ERR_PTR(-ENOMEM); + + err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL); + if (err < 0) + goto err_nsim_bus_dev_free; + nsim_bus_dev->dev.id = err; + nsim_bus_dev->dev.bus = &nsim_bus; + nsim_bus_dev->dev.type = &nsim_bus_dev_type; + nsim_bus_dev->port_count = port_count; + nsim_bus_dev->initial_net = current->nsproxy->net_ns; + mutex_init(&nsim_bus_dev->nsim_bus_reload_lock); + /* Disallow using nsim_bus_dev */ + smp_store_release(&nsim_bus_dev->init, false); + + err = device_register(&nsim_bus_dev->dev); + if (err) + goto err_nsim_bus_dev_id_free; + return nsim_bus_dev; + +err_nsim_bus_dev_id_free: + ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id); +err_nsim_bus_dev_free: + kfree(nsim_bus_dev); + return ERR_PTR(err); +} + +static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev) +{ + /* Disallow using nsim_bus_dev */ + smp_store_release(&nsim_bus_dev->init, false); + device_unregister(&nsim_bus_dev->dev); + ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id); + kfree(nsim_bus_dev); +} + +static struct device_driver nsim_driver = { + .name = DRV_NAME, + .bus = &nsim_bus, + .owner = THIS_MODULE, +}; + +int nsim_bus_init(void) +{ + int err; + + err = bus_register(&nsim_bus); + if (err) + return err; + err = driver_register(&nsim_driver); + if (err) + goto err_bus_unregister; + /* Allow using resources */ + smp_store_release(&nsim_bus_enable, true); + return 0; + +err_bus_unregister: + bus_unregister(&nsim_bus); + return err; +} + +void nsim_bus_exit(void) +{ + struct nsim_bus_dev *nsim_bus_dev, *tmp; + + /* Disallow using resources */ + smp_store_release(&nsim_bus_enable, false); + + mutex_lock(&nsim_bus_dev_list_lock); + list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) { + list_del(&nsim_bus_dev->list); + nsim_bus_dev_del(nsim_bus_dev); + } + mutex_unlock(&nsim_bus_dev_list_lock); + + driver_unregister(&nsim_driver); + bus_unregister(&nsim_bus); +} diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c new file mode 100644 index 000000000..bcf354719 --- /dev/null +++ b/drivers/net/netdevsim/dev.c @@ -0,0 +1,1231 @@ +/* + * Copyright (c) 2018 Cumulus Networks. All rights reserved. + * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com> + * Copyright (c) 2019 Mellanox Technologies. All rights reserved. + * + * 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/debugfs.h> +#include <linux/device.h> +#include <linux/etherdevice.h> +#include <linux/inet.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/random.h> +#include <linux/rtnetlink.h> +#include <linux/workqueue.h> +#include <net/devlink.h> +#include <net/ip.h> +#include <net/flow_offload.h> +#include <uapi/linux/devlink.h> +#include <uapi/linux/ip.h> +#include <uapi/linux/udp.h> + +#include "netdevsim.h" + +static struct dentry *nsim_dev_ddir; + +#define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32) + +static int +nsim_dev_take_snapshot(struct devlink *devlink, + const struct devlink_region_ops *ops, + struct netlink_ext_ack *extack, + u8 **data) +{ + void *dummy_data; + + dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL); + if (!dummy_data) + return -ENOMEM; + + get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE); + + *data = dummy_data; + + return 0; +} + +static ssize_t nsim_dev_take_snapshot_write(struct file *file, + const char __user *data, + size_t count, loff_t *ppos) +{ + struct nsim_dev *nsim_dev = file->private_data; + struct devlink *devlink; + u8 *dummy_data; + int err; + u32 id; + + devlink = priv_to_devlink(nsim_dev); + + err = nsim_dev_take_snapshot(devlink, NULL, NULL, &dummy_data); + if (err) + return err; + + err = devlink_region_snapshot_id_get(devlink, &id); + if (err) { + pr_err("Failed to get snapshot id\n"); + kfree(dummy_data); + return err; + } + err = devlink_region_snapshot_create(nsim_dev->dummy_region, + dummy_data, id); + devlink_region_snapshot_id_put(devlink, id); + if (err) { + pr_err("Failed to create region snapshot\n"); + kfree(dummy_data); + return err; + } + + return count; +} + +static const struct file_operations nsim_dev_take_snapshot_fops = { + .open = simple_open, + .write = nsim_dev_take_snapshot_write, + .llseek = generic_file_llseek, + .owner = THIS_MODULE, +}; + +static ssize_t nsim_dev_trap_fa_cookie_read(struct file *file, + char __user *data, + size_t count, loff_t *ppos) +{ + struct nsim_dev *nsim_dev = file->private_data; + struct flow_action_cookie *fa_cookie; + unsigned int buf_len; + ssize_t ret; + char *buf; + + spin_lock(&nsim_dev->fa_cookie_lock); + fa_cookie = nsim_dev->fa_cookie; + if (!fa_cookie) { + ret = -EINVAL; + goto errout; + } + buf_len = fa_cookie->cookie_len * 2; + buf = kmalloc(buf_len, GFP_ATOMIC); + if (!buf) { + ret = -ENOMEM; + goto errout; + } + bin2hex(buf, fa_cookie->cookie, fa_cookie->cookie_len); + spin_unlock(&nsim_dev->fa_cookie_lock); + + ret = simple_read_from_buffer(data, count, ppos, buf, buf_len); + + kfree(buf); + return ret; + +errout: + spin_unlock(&nsim_dev->fa_cookie_lock); + return ret; +} + +static ssize_t nsim_dev_trap_fa_cookie_write(struct file *file, + const char __user *data, + size_t count, loff_t *ppos) +{ + struct nsim_dev *nsim_dev = file->private_data; + struct flow_action_cookie *fa_cookie; + size_t cookie_len; + ssize_t ret; + char *buf; + + if (*ppos != 0) + return -EINVAL; + cookie_len = (count - 1) / 2; + if ((count - 1) % 2) + return -EINVAL; + + buf = memdup_user(data, count); + if (IS_ERR(buf)) + return PTR_ERR(buf); + + fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len, + GFP_KERNEL | __GFP_NOWARN); + if (!fa_cookie) { + ret = -ENOMEM; + goto free_buf; + } + + fa_cookie->cookie_len = cookie_len; + ret = hex2bin(fa_cookie->cookie, buf, cookie_len); + if (ret) + goto free_fa_cookie; + kfree(buf); + + spin_lock(&nsim_dev->fa_cookie_lock); + kfree(nsim_dev->fa_cookie); + nsim_dev->fa_cookie = fa_cookie; + spin_unlock(&nsim_dev->fa_cookie_lock); + + return count; + +free_fa_cookie: + kfree(fa_cookie); +free_buf: + kfree(buf); + return ret; +} + +static const struct file_operations nsim_dev_trap_fa_cookie_fops = { + .open = simple_open, + .read = nsim_dev_trap_fa_cookie_read, + .write = nsim_dev_trap_fa_cookie_write, + .llseek = generic_file_llseek, + .owner = THIS_MODULE, +}; + +static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev) +{ + char dev_ddir_name[sizeof(DRV_NAME) + 10]; + + sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id); + nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir); + if (IS_ERR(nsim_dev->ddir)) + return PTR_ERR(nsim_dev->ddir); + nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir); + if (IS_ERR(nsim_dev->ports_ddir)) + return PTR_ERR(nsim_dev->ports_ddir); + debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir, + &nsim_dev->fw_update_status); + debugfs_create_u32("fw_update_overwrite_mask", 0600, nsim_dev->ddir, + &nsim_dev->fw_update_overwrite_mask); + debugfs_create_u32("max_macs", 0600, nsim_dev->ddir, + &nsim_dev->max_macs); + debugfs_create_bool("test1", 0600, nsim_dev->ddir, + &nsim_dev->test1); + nsim_dev->take_snapshot = debugfs_create_file("take_snapshot", + 0200, + nsim_dev->ddir, + nsim_dev, + &nsim_dev_take_snapshot_fops); + debugfs_create_bool("dont_allow_reload", 0600, nsim_dev->ddir, + &nsim_dev->dont_allow_reload); + debugfs_create_bool("fail_reload", 0600, nsim_dev->ddir, + &nsim_dev->fail_reload); + debugfs_create_file("trap_flow_action_cookie", 0600, nsim_dev->ddir, + nsim_dev, &nsim_dev_trap_fa_cookie_fops); + debugfs_create_bool("fail_trap_group_set", 0600, + nsim_dev->ddir, + &nsim_dev->fail_trap_group_set); + debugfs_create_bool("fail_trap_policer_set", 0600, + nsim_dev->ddir, + &nsim_dev->fail_trap_policer_set); + debugfs_create_bool("fail_trap_policer_counter_get", 0600, + nsim_dev->ddir, + &nsim_dev->fail_trap_policer_counter_get); + nsim_udp_tunnels_debugfs_create(nsim_dev); + return 0; +} + +static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev) +{ + debugfs_remove_recursive(nsim_dev->ports_ddir); + debugfs_remove_recursive(nsim_dev->ddir); +} + +static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev, + struct nsim_dev_port *nsim_dev_port) +{ + char port_ddir_name[16]; + char dev_link_name[32]; + + sprintf(port_ddir_name, "%u", nsim_dev_port->port_index); + nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name, + nsim_dev->ports_ddir); + if (IS_ERR(nsim_dev_port->ddir)) + return PTR_ERR(nsim_dev_port->ddir); + + sprintf(dev_link_name, "../../../" DRV_NAME "%u", + nsim_dev->nsim_bus_dev->dev.id); + debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name); + + return 0; +} + +static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port) +{ + debugfs_remove_recursive(nsim_dev_port->ddir); +} + +static int nsim_dev_resources_register(struct devlink *devlink) +{ + struct devlink_resource_size_params params = { + .size_max = (u64)-1, + .size_granularity = 1, + .unit = DEVLINK_RESOURCE_UNIT_ENTRY + }; + int err; + + /* Resources for IPv4 */ + err = devlink_resource_register(devlink, "IPv4", (u64)-1, + NSIM_RESOURCE_IPV4, + DEVLINK_RESOURCE_ID_PARENT_TOP, + ¶ms); + if (err) { + pr_err("Failed to register IPv4 top resource\n"); + goto out; + } + + err = devlink_resource_register(devlink, "fib", (u64)-1, + NSIM_RESOURCE_IPV4_FIB, + NSIM_RESOURCE_IPV4, ¶ms); + if (err) { + pr_err("Failed to register IPv4 FIB resource\n"); + return err; + } + + err = devlink_resource_register(devlink, "fib-rules", (u64)-1, + NSIM_RESOURCE_IPV4_FIB_RULES, + NSIM_RESOURCE_IPV4, ¶ms); + 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); + if (err) { + pr_err("Failed to register IPv6 top resource\n"); + goto out; + } + + err = devlink_resource_register(devlink, "fib", (u64)-1, + NSIM_RESOURCE_IPV6_FIB, + NSIM_RESOURCE_IPV6, ¶ms); + if (err) { + pr_err("Failed to register IPv6 FIB resource\n"); + return err; + } + + err = devlink_resource_register(devlink, "fib-rules", (u64)-1, + NSIM_RESOURCE_IPV6_FIB_RULES, + NSIM_RESOURCE_IPV6, ¶ms); + if (err) { + pr_err("Failed to register IPv6 FIB rules resource\n"); + return err; + } + +out: + return err; +} + +enum nsim_devlink_param_id { + NSIM_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX, + NSIM_DEVLINK_PARAM_ID_TEST1, +}; + +static const struct devlink_param nsim_devlink_params[] = { + DEVLINK_PARAM_GENERIC(MAX_MACS, + BIT(DEVLINK_PARAM_CMODE_DRIVERINIT), + NULL, NULL, NULL), + DEVLINK_PARAM_DRIVER(NSIM_DEVLINK_PARAM_ID_TEST1, + "test1", DEVLINK_PARAM_TYPE_BOOL, + BIT(DEVLINK_PARAM_CMODE_DRIVERINIT), + NULL, NULL, NULL), +}; + +static void nsim_devlink_set_params_init_values(struct nsim_dev *nsim_dev, + struct devlink *devlink) +{ + union devlink_param_value value; + + value.vu32 = nsim_dev->max_macs; + devlink_param_driverinit_value_set(devlink, + DEVLINK_PARAM_GENERIC_ID_MAX_MACS, + value); + value.vbool = nsim_dev->test1; + devlink_param_driverinit_value_set(devlink, + NSIM_DEVLINK_PARAM_ID_TEST1, + value); +} + +static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + union devlink_param_value saved_value; + int err; + + err = devlink_param_driverinit_value_get(devlink, + DEVLINK_PARAM_GENERIC_ID_MAX_MACS, + &saved_value); + if (!err) + nsim_dev->max_macs = saved_value.vu32; + err = devlink_param_driverinit_value_get(devlink, + NSIM_DEVLINK_PARAM_ID_TEST1, + &saved_value); + if (!err) + nsim_dev->test1 = saved_value.vbool; +} + +#define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16 + +static const struct devlink_region_ops dummy_region_ops = { + .name = "dummy", + .destructor = &kfree, + .snapshot = nsim_dev_take_snapshot, +}; + +static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev, + struct devlink *devlink) +{ + nsim_dev->dummy_region = + devlink_region_create(devlink, &dummy_region_ops, + NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX, + NSIM_DEV_DUMMY_REGION_SIZE); + return PTR_ERR_OR_ZERO(nsim_dev->dummy_region); +} + +static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev) +{ + devlink_region_destroy(nsim_dev->dummy_region); +} + +struct nsim_trap_item { + void *trap_ctx; + enum devlink_trap_action action; +}; + +struct nsim_trap_data { + struct delayed_work trap_report_dw; + struct nsim_trap_item *trap_items_arr; + u64 *trap_policers_cnt_arr; + struct nsim_dev *nsim_dev; + spinlock_t trap_lock; /* Protects trap_items_arr */ +}; + +/* All driver-specific traps must be documented in + * Documentation/networking/devlink/netdevsim.rst + */ +enum { + NSIM_TRAP_ID_BASE = DEVLINK_TRAP_GENERIC_ID_MAX, + NSIM_TRAP_ID_FID_MISS, +}; + +#define NSIM_TRAP_NAME_FID_MISS "fid_miss" + +#define NSIM_TRAP_METADATA DEVLINK_TRAP_METADATA_TYPE_F_IN_PORT + +#define NSIM_TRAP_DROP(_id, _group_id) \ + DEVLINK_TRAP_GENERIC(DROP, DROP, _id, \ + DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ + NSIM_TRAP_METADATA) +#define NSIM_TRAP_DROP_EXT(_id, _group_id, _metadata) \ + DEVLINK_TRAP_GENERIC(DROP, DROP, _id, \ + DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ + NSIM_TRAP_METADATA | (_metadata)) +#define NSIM_TRAP_EXCEPTION(_id, _group_id) \ + DEVLINK_TRAP_GENERIC(EXCEPTION, TRAP, _id, \ + DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ + NSIM_TRAP_METADATA) +#define NSIM_TRAP_CONTROL(_id, _group_id, _action) \ + DEVLINK_TRAP_GENERIC(CONTROL, _action, _id, \ + DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ + NSIM_TRAP_METADATA) +#define NSIM_TRAP_DRIVER_EXCEPTION(_id, _group_id) \ + DEVLINK_TRAP_DRIVER(EXCEPTION, TRAP, NSIM_TRAP_ID_##_id, \ + NSIM_TRAP_NAME_##_id, \ + DEVLINK_TRAP_GROUP_GENERIC_ID_##_group_id, \ + NSIM_TRAP_METADATA) + +#define NSIM_DEV_TRAP_POLICER_MIN_RATE 1 +#define NSIM_DEV_TRAP_POLICER_MAX_RATE 8000 +#define NSIM_DEV_TRAP_POLICER_MIN_BURST 8 +#define NSIM_DEV_TRAP_POLICER_MAX_BURST 65536 + +#define NSIM_TRAP_POLICER(_id, _rate, _burst) \ + DEVLINK_TRAP_POLICER(_id, _rate, _burst, \ + NSIM_DEV_TRAP_POLICER_MAX_RATE, \ + NSIM_DEV_TRAP_POLICER_MIN_RATE, \ + NSIM_DEV_TRAP_POLICER_MAX_BURST, \ + NSIM_DEV_TRAP_POLICER_MIN_BURST) + +static const struct devlink_trap_policer nsim_trap_policers_arr[] = { + NSIM_TRAP_POLICER(1, 1000, 128), + NSIM_TRAP_POLICER(2, 2000, 256), + NSIM_TRAP_POLICER(3, 3000, 512), +}; + +static const struct devlink_trap_group nsim_trap_groups_arr[] = { + DEVLINK_TRAP_GROUP_GENERIC(L2_DROPS, 0), + DEVLINK_TRAP_GROUP_GENERIC(L3_DROPS, 1), + DEVLINK_TRAP_GROUP_GENERIC(L3_EXCEPTIONS, 1), + DEVLINK_TRAP_GROUP_GENERIC(BUFFER_DROPS, 2), + DEVLINK_TRAP_GROUP_GENERIC(ACL_DROPS, 3), + DEVLINK_TRAP_GROUP_GENERIC(MC_SNOOPING, 3), +}; + +static const struct devlink_trap nsim_traps_arr[] = { + NSIM_TRAP_DROP(SMAC_MC, L2_DROPS), + NSIM_TRAP_DROP(VLAN_TAG_MISMATCH, L2_DROPS), + NSIM_TRAP_DROP(INGRESS_VLAN_FILTER, L2_DROPS), + NSIM_TRAP_DROP(INGRESS_STP_FILTER, L2_DROPS), + NSIM_TRAP_DROP(EMPTY_TX_LIST, L2_DROPS), + NSIM_TRAP_DROP(PORT_LOOPBACK_FILTER, L2_DROPS), + NSIM_TRAP_DRIVER_EXCEPTION(FID_MISS, L2_DROPS), + NSIM_TRAP_DROP(BLACKHOLE_ROUTE, L3_DROPS), + NSIM_TRAP_EXCEPTION(TTL_ERROR, L3_EXCEPTIONS), + NSIM_TRAP_DROP(TAIL_DROP, BUFFER_DROPS), + NSIM_TRAP_DROP_EXT(INGRESS_FLOW_ACTION_DROP, ACL_DROPS, + DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE), + NSIM_TRAP_DROP_EXT(EGRESS_FLOW_ACTION_DROP, ACL_DROPS, + DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE), + NSIM_TRAP_CONTROL(IGMP_QUERY, MC_SNOOPING, MIRROR), + NSIM_TRAP_CONTROL(IGMP_V1_REPORT, MC_SNOOPING, TRAP), +}; + +#define NSIM_TRAP_L4_DATA_LEN 100 + +static struct sk_buff *nsim_dev_trap_skb_build(void) +{ + int tot_len, data_len = NSIM_TRAP_L4_DATA_LEN; + struct sk_buff *skb; + struct udphdr *udph; + struct ethhdr *eth; + struct iphdr *iph; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); + if (!skb) + return NULL; + tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + data_len; + + skb_reset_mac_header(skb); + eth = skb_put(skb, sizeof(struct ethhdr)); + eth_random_addr(eth->h_dest); + eth_random_addr(eth->h_source); + eth->h_proto = htons(ETH_P_IP); + skb->protocol = htons(ETH_P_IP); + + skb_set_network_header(skb, skb->len); + iph = skb_put(skb, sizeof(struct iphdr)); + iph->protocol = IPPROTO_UDP; + iph->saddr = in_aton("192.0.2.1"); + iph->daddr = in_aton("198.51.100.1"); + iph->version = 0x4; + iph->frag_off = 0; + iph->ihl = 0x5; + iph->tot_len = htons(tot_len); + iph->ttl = 100; + iph->check = 0; + iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); + + skb_set_transport_header(skb, skb->len); + udph = skb_put_zero(skb, sizeof(struct udphdr) + data_len); + get_random_bytes(&udph->source, sizeof(u16)); + get_random_bytes(&udph->dest, sizeof(u16)); + udph->len = htons(sizeof(struct udphdr) + data_len); + + return skb; +} + +static void nsim_dev_trap_report(struct nsim_dev_port *nsim_dev_port) +{ + struct nsim_dev *nsim_dev = nsim_dev_port->ns->nsim_dev; + struct devlink *devlink = priv_to_devlink(nsim_dev); + struct nsim_trap_data *nsim_trap_data; + int i; + + nsim_trap_data = nsim_dev->trap_data; + + spin_lock(&nsim_trap_data->trap_lock); + for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) { + struct flow_action_cookie *fa_cookie = NULL; + struct nsim_trap_item *nsim_trap_item; + struct sk_buff *skb; + bool has_fa_cookie; + + has_fa_cookie = nsim_traps_arr[i].metadata_cap & + DEVLINK_TRAP_METADATA_TYPE_F_FA_COOKIE; + + nsim_trap_item = &nsim_trap_data->trap_items_arr[i]; + if (nsim_trap_item->action == DEVLINK_TRAP_ACTION_DROP) + continue; + + skb = nsim_dev_trap_skb_build(); + if (!skb) + continue; + skb->dev = nsim_dev_port->ns->netdev; + + /* Trapped packets are usually passed to devlink in softIRQ, + * but in this case they are generated in a workqueue. Disable + * softIRQs to prevent lockdep from complaining about + * "incosistent lock state". + */ + + spin_lock_bh(&nsim_dev->fa_cookie_lock); + fa_cookie = has_fa_cookie ? nsim_dev->fa_cookie : NULL; + devlink_trap_report(devlink, skb, nsim_trap_item->trap_ctx, + &nsim_dev_port->devlink_port, fa_cookie); + spin_unlock_bh(&nsim_dev->fa_cookie_lock); + consume_skb(skb); + } + spin_unlock(&nsim_trap_data->trap_lock); +} + +#define NSIM_TRAP_REPORT_INTERVAL_MS 100 + +static void nsim_dev_trap_report_work(struct work_struct *work) +{ + struct nsim_trap_data *nsim_trap_data; + struct nsim_dev_port *nsim_dev_port; + struct nsim_dev *nsim_dev; + + nsim_trap_data = container_of(work, struct nsim_trap_data, + trap_report_dw.work); + nsim_dev = nsim_trap_data->nsim_dev; + + /* For each running port and enabled packet trap, generate a UDP + * packet with a random 5-tuple and report it. + */ + mutex_lock(&nsim_dev->port_list_lock); + list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) { + if (!netif_running(nsim_dev_port->ns->netdev)) + continue; + + nsim_dev_trap_report(nsim_dev_port); + } + mutex_unlock(&nsim_dev->port_list_lock); + + schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw, + msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS)); +} + +static int nsim_dev_traps_init(struct devlink *devlink) +{ + size_t policers_count = ARRAY_SIZE(nsim_trap_policers_arr); + struct nsim_dev *nsim_dev = devlink_priv(devlink); + struct nsim_trap_data *nsim_trap_data; + int err; + + nsim_trap_data = kzalloc(sizeof(*nsim_trap_data), GFP_KERNEL); + if (!nsim_trap_data) + return -ENOMEM; + + nsim_trap_data->trap_items_arr = kcalloc(ARRAY_SIZE(nsim_traps_arr), + sizeof(struct nsim_trap_item), + GFP_KERNEL); + if (!nsim_trap_data->trap_items_arr) { + err = -ENOMEM; + goto err_trap_data_free; + } + + nsim_trap_data->trap_policers_cnt_arr = kcalloc(policers_count, + sizeof(u64), + GFP_KERNEL); + if (!nsim_trap_data->trap_policers_cnt_arr) { + err = -ENOMEM; + goto err_trap_items_free; + } + + /* The lock is used to protect the action state of the registered + * traps. The value is written by user and read in delayed work when + * iterating over all the traps. + */ + spin_lock_init(&nsim_trap_data->trap_lock); + nsim_trap_data->nsim_dev = nsim_dev; + nsim_dev->trap_data = nsim_trap_data; + + err = devlink_trap_policers_register(devlink, nsim_trap_policers_arr, + policers_count); + if (err) + goto err_trap_policers_cnt_free; + + err = devlink_trap_groups_register(devlink, nsim_trap_groups_arr, + ARRAY_SIZE(nsim_trap_groups_arr)); + if (err) + goto err_trap_policers_unregister; + + err = devlink_traps_register(devlink, nsim_traps_arr, + ARRAY_SIZE(nsim_traps_arr), NULL); + if (err) + goto err_trap_groups_unregister; + + INIT_DELAYED_WORK(&nsim_dev->trap_data->trap_report_dw, + nsim_dev_trap_report_work); + schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw, + msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS)); + + return 0; + +err_trap_groups_unregister: + devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr, + ARRAY_SIZE(nsim_trap_groups_arr)); +err_trap_policers_unregister: + devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr, + ARRAY_SIZE(nsim_trap_policers_arr)); +err_trap_policers_cnt_free: + kfree(nsim_trap_data->trap_policers_cnt_arr); +err_trap_items_free: + kfree(nsim_trap_data->trap_items_arr); +err_trap_data_free: + kfree(nsim_trap_data); + return err; +} + +static void nsim_dev_traps_exit(struct devlink *devlink) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + + cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw); + devlink_traps_unregister(devlink, nsim_traps_arr, + ARRAY_SIZE(nsim_traps_arr)); + devlink_trap_groups_unregister(devlink, nsim_trap_groups_arr, + ARRAY_SIZE(nsim_trap_groups_arr)); + devlink_trap_policers_unregister(devlink, nsim_trap_policers_arr, + ARRAY_SIZE(nsim_trap_policers_arr)); + kfree(nsim_dev->trap_data->trap_policers_cnt_arr); + kfree(nsim_dev->trap_data->trap_items_arr); + kfree(nsim_dev->trap_data); +} + +static int nsim_dev_reload_create(struct nsim_dev *nsim_dev, + struct netlink_ext_ack *extack); +static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev); + +static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change, + enum devlink_reload_action action, enum devlink_reload_limit limit, + struct netlink_ext_ack *extack) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + + if (nsim_dev->dont_allow_reload) { + /* For testing purposes, user set debugfs dont_allow_reload + * value to true. So forbid it. + */ + NL_SET_ERR_MSG_MOD(extack, "User forbid the reload for testing purposes"); + return -EOPNOTSUPP; + } + + nsim_dev_reload_destroy(nsim_dev); + return 0; +} + +static int nsim_dev_reload_up(struct devlink *devlink, enum devlink_reload_action action, + enum devlink_reload_limit limit, u32 *actions_performed, + struct netlink_ext_ack *extack) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + + if (nsim_dev->fail_reload) { + /* For testing purposes, user set debugfs fail_reload + * value to true. Fail right away. + */ + NL_SET_ERR_MSG_MOD(extack, "User setup the reload to fail for testing purposes"); + return -EINVAL; + } + + *actions_performed = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT); + return nsim_dev_reload_create(nsim_dev, extack); +} + +static int nsim_dev_info_get(struct devlink *devlink, + struct devlink_info_req *req, + struct netlink_ext_ack *extack) +{ + return devlink_info_driver_name_put(req, DRV_NAME); +} + +#define NSIM_DEV_FLASH_SIZE 500000 +#define NSIM_DEV_FLASH_CHUNK_SIZE 1000 +#define NSIM_DEV_FLASH_CHUNK_TIME_MS 10 + +static int nsim_dev_flash_update(struct devlink *devlink, + struct devlink_flash_update_params *params, + struct netlink_ext_ack *extack) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + int i; + + if ((params->overwrite_mask & ~nsim_dev->fw_update_overwrite_mask) != 0) + return -EOPNOTSUPP; + + if (nsim_dev->fw_update_status) { + devlink_flash_update_begin_notify(devlink); + devlink_flash_update_status_notify(devlink, + "Preparing to flash", + params->component, 0, 0); + } + + for (i = 0; i < NSIM_DEV_FLASH_SIZE / NSIM_DEV_FLASH_CHUNK_SIZE; i++) { + if (nsim_dev->fw_update_status) + devlink_flash_update_status_notify(devlink, "Flashing", + params->component, + i * NSIM_DEV_FLASH_CHUNK_SIZE, + NSIM_DEV_FLASH_SIZE); + msleep(NSIM_DEV_FLASH_CHUNK_TIME_MS); + } + + if (nsim_dev->fw_update_status) { + devlink_flash_update_status_notify(devlink, "Flashing", + params->component, + NSIM_DEV_FLASH_SIZE, + NSIM_DEV_FLASH_SIZE); + devlink_flash_update_timeout_notify(devlink, "Flash select", + params->component, 81); + devlink_flash_update_status_notify(devlink, "Flashing done", + params->component, 0, 0); + devlink_flash_update_end_notify(devlink); + } + + return 0; +} + +static struct nsim_trap_item * +nsim_dev_trap_item_lookup(struct nsim_dev *nsim_dev, u16 trap_id) +{ + struct nsim_trap_data *nsim_trap_data = nsim_dev->trap_data; + int i; + + for (i = 0; i < ARRAY_SIZE(nsim_traps_arr); i++) { + if (nsim_traps_arr[i].id == trap_id) + return &nsim_trap_data->trap_items_arr[i]; + } + + return NULL; +} + +static int nsim_dev_devlink_trap_init(struct devlink *devlink, + const struct devlink_trap *trap, + void *trap_ctx) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + struct nsim_trap_item *nsim_trap_item; + + nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id); + if (WARN_ON(!nsim_trap_item)) + return -ENOENT; + + nsim_trap_item->trap_ctx = trap_ctx; + nsim_trap_item->action = trap->init_action; + + return 0; +} + +static int +nsim_dev_devlink_trap_action_set(struct devlink *devlink, + const struct devlink_trap *trap, + enum devlink_trap_action action, + struct netlink_ext_ack *extack) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + struct nsim_trap_item *nsim_trap_item; + + nsim_trap_item = nsim_dev_trap_item_lookup(nsim_dev, trap->id); + if (WARN_ON(!nsim_trap_item)) + return -ENOENT; + + spin_lock(&nsim_dev->trap_data->trap_lock); + nsim_trap_item->action = action; + spin_unlock(&nsim_dev->trap_data->trap_lock); + + return 0; +} + +static int +nsim_dev_devlink_trap_group_set(struct devlink *devlink, + const struct devlink_trap_group *group, + const struct devlink_trap_policer *policer, + struct netlink_ext_ack *extack) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + + if (nsim_dev->fail_trap_group_set) + return -EINVAL; + + return 0; +} + +static int +nsim_dev_devlink_trap_policer_set(struct devlink *devlink, + const struct devlink_trap_policer *policer, + u64 rate, u64 burst, + struct netlink_ext_ack *extack) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + + if (nsim_dev->fail_trap_policer_set) { + NL_SET_ERR_MSG_MOD(extack, "User setup the operation to fail for testing purposes"); + return -EINVAL; + } + + return 0; +} + +static int +nsim_dev_devlink_trap_policer_counter_get(struct devlink *devlink, + const struct devlink_trap_policer *policer, + u64 *p_drops) +{ + struct nsim_dev *nsim_dev = devlink_priv(devlink); + u64 *cnt; + + if (nsim_dev->fail_trap_policer_counter_get) + return -EINVAL; + + cnt = &nsim_dev->trap_data->trap_policers_cnt_arr[policer->id - 1]; + *p_drops = (*cnt)++; + + return 0; +} + +static const struct devlink_ops nsim_dev_devlink_ops = { + .supported_flash_update_params = DEVLINK_SUPPORT_FLASH_UPDATE_COMPONENT | + DEVLINK_SUPPORT_FLASH_UPDATE_OVERWRITE_MASK, + .reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT), + .reload_down = nsim_dev_reload_down, + .reload_up = nsim_dev_reload_up, + .info_get = nsim_dev_info_get, + .flash_update = nsim_dev_flash_update, + .trap_init = nsim_dev_devlink_trap_init, + .trap_action_set = nsim_dev_devlink_trap_action_set, + .trap_group_set = nsim_dev_devlink_trap_group_set, + .trap_policer_set = nsim_dev_devlink_trap_policer_set, + .trap_policer_counter_get = nsim_dev_devlink_trap_policer_counter_get, +}; + +#define NSIM_DEV_MAX_MACS_DEFAULT 32 +#define NSIM_DEV_TEST1_DEFAULT true + +static int __nsim_dev_port_add(struct nsim_dev *nsim_dev, + unsigned int port_index) +{ + struct devlink_port_attrs attrs = {}; + struct nsim_dev_port *nsim_dev_port; + struct devlink_port *devlink_port; + int err; + + nsim_dev_port = kzalloc(sizeof(*nsim_dev_port), GFP_KERNEL); + if (!nsim_dev_port) + return -ENOMEM; + nsim_dev_port->port_index = port_index; + + devlink_port = &nsim_dev_port->devlink_port; + attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL; + attrs.phys.port_number = port_index + 1; + memcpy(attrs.switch_id.id, nsim_dev->switch_id.id, nsim_dev->switch_id.id_len); + attrs.switch_id.id_len = nsim_dev->switch_id.id_len; + devlink_port_attrs_set(devlink_port, &attrs); + err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port, + port_index); + if (err) + goto err_port_free; + + err = nsim_dev_port_debugfs_init(nsim_dev, nsim_dev_port); + if (err) + goto err_dl_port_unregister; + + nsim_dev_port->ns = nsim_create(nsim_dev, nsim_dev_port); + if (IS_ERR(nsim_dev_port->ns)) { + err = PTR_ERR(nsim_dev_port->ns); + goto err_port_debugfs_exit; + } + + devlink_port_type_eth_set(devlink_port, nsim_dev_port->ns->netdev); + list_add(&nsim_dev_port->list, &nsim_dev->port_list); + + return 0; + +err_port_debugfs_exit: + nsim_dev_port_debugfs_exit(nsim_dev_port); +err_dl_port_unregister: + devlink_port_unregister(devlink_port); +err_port_free: + kfree(nsim_dev_port); + return err; +} + +static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port) +{ + struct devlink_port *devlink_port = &nsim_dev_port->devlink_port; + + list_del(&nsim_dev_port->list); + devlink_port_type_clear(devlink_port); + nsim_destroy(nsim_dev_port->ns); + nsim_dev_port_debugfs_exit(nsim_dev_port); + devlink_port_unregister(devlink_port); + kfree(nsim_dev_port); +} + +static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev) +{ + struct nsim_dev_port *nsim_dev_port, *tmp; + + mutex_lock(&nsim_dev->port_list_lock); + list_for_each_entry_safe(nsim_dev_port, tmp, + &nsim_dev->port_list, list) + __nsim_dev_port_del(nsim_dev_port); + mutex_unlock(&nsim_dev->port_list_lock); +} + +static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev, + unsigned int port_count) +{ + int i, err; + + for (i = 0; i < port_count; i++) { + err = __nsim_dev_port_add(nsim_dev, i); + if (err) + goto err_port_del_all; + } + return 0; + +err_port_del_all: + nsim_dev_port_del_all(nsim_dev); + return err; +} + +static int nsim_dev_reload_create(struct nsim_dev *nsim_dev, + struct netlink_ext_ack *extack) +{ + struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev; + struct devlink *devlink; + int err; + + devlink = priv_to_devlink(nsim_dev); + nsim_dev = devlink_priv(devlink); + INIT_LIST_HEAD(&nsim_dev->port_list); + mutex_init(&nsim_dev->port_list_lock); + nsim_dev->fw_update_status = true; + nsim_dev->fw_update_overwrite_mask = 0; + + nsim_devlink_param_load_driverinit_values(devlink); + + err = nsim_dev_dummy_region_init(nsim_dev, devlink); + if (err) + return err; + + err = nsim_dev_traps_init(devlink); + if (err) + goto err_dummy_region_exit; + + nsim_dev->fib_data = nsim_fib_create(devlink, extack); + if (IS_ERR(nsim_dev->fib_data)) { + err = PTR_ERR(nsim_dev->fib_data); + goto err_traps_exit; + } + + err = nsim_dev_health_init(nsim_dev, devlink); + if (err) + goto err_fib_destroy; + + err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count); + if (err) + goto err_health_exit; + + nsim_dev->take_snapshot = debugfs_create_file("take_snapshot", + 0200, + nsim_dev->ddir, + nsim_dev, + &nsim_dev_take_snapshot_fops); + return 0; + +err_health_exit: + nsim_dev_health_exit(nsim_dev); +err_fib_destroy: + nsim_fib_destroy(devlink, nsim_dev->fib_data); +err_traps_exit: + nsim_dev_traps_exit(devlink); +err_dummy_region_exit: + nsim_dev_dummy_region_exit(nsim_dev); + return err; +} + +int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev) +{ + struct nsim_dev *nsim_dev; + struct devlink *devlink; + int err; + + devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev)); + if (!devlink) + return -ENOMEM; + devlink_net_set(devlink, nsim_bus_dev->initial_net); + nsim_dev = devlink_priv(devlink); + nsim_dev->nsim_bus_dev = nsim_bus_dev; + nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id); + get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len); + INIT_LIST_HEAD(&nsim_dev->port_list); + mutex_init(&nsim_dev->port_list_lock); + nsim_dev->fw_update_status = true; + nsim_dev->fw_update_overwrite_mask = 0; + nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT; + nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT; + spin_lock_init(&nsim_dev->fa_cookie_lock); + + dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev); + + err = nsim_dev_resources_register(devlink); + if (err) + goto err_devlink_free; + + err = devlink_register(devlink, &nsim_bus_dev->dev); + if (err) + goto err_resources_unregister; + + err = devlink_params_register(devlink, nsim_devlink_params, + ARRAY_SIZE(nsim_devlink_params)); + if (err) + goto err_dl_unregister; + nsim_devlink_set_params_init_values(nsim_dev, devlink); + + err = nsim_dev_dummy_region_init(nsim_dev, devlink); + if (err) + goto err_params_unregister; + + err = nsim_dev_traps_init(devlink); + if (err) + goto err_dummy_region_exit; + + err = nsim_dev_debugfs_init(nsim_dev); + if (err) + goto err_traps_exit; + + nsim_dev->fib_data = nsim_fib_create(devlink, NULL); + if (IS_ERR(nsim_dev->fib_data)) { + err = PTR_ERR(nsim_dev->fib_data); + goto err_debugfs_exit; + } + + err = nsim_dev_health_init(nsim_dev, devlink); + if (err) + goto err_fib_destroy; + + err = nsim_bpf_dev_init(nsim_dev); + if (err) + goto err_health_exit; + + err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count); + if (err) + goto err_bpf_dev_exit; + + devlink_params_publish(devlink); + devlink_reload_enable(devlink); + return 0; + +err_bpf_dev_exit: + nsim_bpf_dev_exit(nsim_dev); +err_health_exit: + nsim_dev_health_exit(nsim_dev); +err_fib_destroy: + nsim_fib_destroy(devlink, nsim_dev->fib_data); +err_debugfs_exit: + nsim_dev_debugfs_exit(nsim_dev); +err_traps_exit: + nsim_dev_traps_exit(devlink); +err_dummy_region_exit: + nsim_dev_dummy_region_exit(nsim_dev); +err_params_unregister: + devlink_params_unregister(devlink, nsim_devlink_params, + ARRAY_SIZE(nsim_devlink_params)); +err_dl_unregister: + devlink_unregister(devlink); +err_resources_unregister: + devlink_resources_unregister(devlink, NULL); +err_devlink_free: + devlink_free(devlink); + return err; +} + +static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev) +{ + struct devlink *devlink = priv_to_devlink(nsim_dev); + + if (devlink_is_reload_failed(devlink)) + return; + debugfs_remove(nsim_dev->take_snapshot); + nsim_dev_port_del_all(nsim_dev); + nsim_dev_health_exit(nsim_dev); + nsim_fib_destroy(devlink, nsim_dev->fib_data); + nsim_dev_traps_exit(devlink); + nsim_dev_dummy_region_exit(nsim_dev); + mutex_destroy(&nsim_dev->port_list_lock); +} + +void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev) +{ + struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev); + struct devlink *devlink = priv_to_devlink(nsim_dev); + + devlink_reload_disable(devlink); + + nsim_dev_reload_destroy(nsim_dev); + + nsim_bpf_dev_exit(nsim_dev); + nsim_dev_debugfs_exit(nsim_dev); + devlink_params_unregister(devlink, nsim_devlink_params, + ARRAY_SIZE(nsim_devlink_params)); + devlink_unregister(devlink); + devlink_resources_unregister(devlink, NULL); + devlink_free(devlink); +} + +static struct nsim_dev_port * +__nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index) +{ + struct nsim_dev_port *nsim_dev_port; + + list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) + if (nsim_dev_port->port_index == port_index) + return nsim_dev_port; + return NULL; +} + +int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev, + unsigned int port_index) +{ + struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev); + int err; + + mutex_lock(&nsim_dev->port_list_lock); + if (__nsim_dev_port_lookup(nsim_dev, port_index)) + err = -EEXIST; + else + err = __nsim_dev_port_add(nsim_dev, port_index); + mutex_unlock(&nsim_dev->port_list_lock); + return err; +} + +int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev, + unsigned int port_index) +{ + struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev); + struct nsim_dev_port *nsim_dev_port; + int err = 0; + + mutex_lock(&nsim_dev->port_list_lock); + nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, port_index); + if (!nsim_dev_port) + err = -ENOENT; + else + __nsim_dev_port_del(nsim_dev_port); + mutex_unlock(&nsim_dev->port_list_lock); + return err; +} + +int nsim_dev_init(void) +{ + nsim_dev_ddir = debugfs_create_dir(DRV_NAME, NULL); + return PTR_ERR_OR_ZERO(nsim_dev_ddir); +} + +void nsim_dev_exit(void) +{ + debugfs_remove_recursive(nsim_dev_ddir); +} diff --git a/drivers/net/netdevsim/ethtool.c b/drivers/net/netdevsim/ethtool.c new file mode 100644 index 000000000..f1884d90a --- /dev/null +++ b/drivers/net/netdevsim/ethtool.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2020 Facebook + +#include <linux/debugfs.h> +#include <linux/ethtool.h> +#include <linux/random.h> + +#include "netdevsim.h" + +static void +nsim_get_pause_stats(struct net_device *dev, + struct ethtool_pause_stats *pause_stats) +{ + struct netdevsim *ns = netdev_priv(dev); + + if (ns->ethtool.report_stats_rx) + pause_stats->rx_pause_frames = 1; + if (ns->ethtool.report_stats_tx) + pause_stats->tx_pause_frames = 2; +} + +static void +nsim_get_pauseparam(struct net_device *dev, struct ethtool_pauseparam *pause) +{ + struct netdevsim *ns = netdev_priv(dev); + + pause->autoneg = 0; /* We don't support ksettings, so can't pretend */ + pause->rx_pause = ns->ethtool.rx; + pause->tx_pause = ns->ethtool.tx; +} + +static int +nsim_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam *pause) +{ + struct netdevsim *ns = netdev_priv(dev); + + if (pause->autoneg) + return -EINVAL; + + ns->ethtool.rx = pause->rx_pause; + ns->ethtool.tx = pause->tx_pause; + return 0; +} + +static const struct ethtool_ops nsim_ethtool_ops = { + .get_pause_stats = nsim_get_pause_stats, + .get_pauseparam = nsim_get_pauseparam, + .set_pauseparam = nsim_set_pauseparam, +}; + +void nsim_ethtool_init(struct netdevsim *ns) +{ + struct dentry *ethtool, *dir; + + ns->netdev->ethtool_ops = &nsim_ethtool_ops; + + ethtool = debugfs_create_dir("ethtool", ns->nsim_dev_port->ddir); + + dir = debugfs_create_dir("pause", ethtool); + debugfs_create_bool("report_stats_rx", 0600, dir, + &ns->ethtool.report_stats_rx); + debugfs_create_bool("report_stats_tx", 0600, dir, + &ns->ethtool.report_stats_tx); +} diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c new file mode 100644 index 000000000..deea17a0e --- /dev/null +++ b/drivers/net/netdevsim/fib.c @@ -0,0 +1,957 @@ +/* + * 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/in6.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/rhashtable.h> +#include <linux/spinlock_types.h> +#include <linux/types.h> +#include <net/fib_notifier.h> +#include <net/ip_fib.h> +#include <net/ip6_fib.h> +#include <net/fib_rules.h> +#include <net/net_namespace.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 notifier_block fib_nb; + struct nsim_per_fib_data ipv4; + struct nsim_per_fib_data ipv6; + struct rhashtable fib_rt_ht; + struct list_head fib_rt_list; + spinlock_t fib_lock; /* Protects hashtable, list and accounting */ + struct devlink *devlink; +}; + +struct nsim_fib_rt_key { + unsigned char addr[sizeof(struct in6_addr)]; + unsigned char prefix_len; + int family; + u32 tb_id; +}; + +struct nsim_fib_rt { + struct nsim_fib_rt_key key; + struct rhash_head ht_node; + struct list_head list; /* Member of fib_rt_list */ +}; + +struct nsim_fib4_rt { + struct nsim_fib_rt common; + struct fib_info *fi; + u8 tos; + u8 type; +}; + +struct nsim_fib6_rt { + struct nsim_fib_rt common; + struct list_head nh_list; + unsigned int nhs; +}; + +struct nsim_fib6_rt_nh { + struct list_head list; /* Member of nh_list */ + struct fib6_info *rt; +}; + +static const struct rhashtable_params nsim_fib_rt_ht_params = { + .key_offset = offsetof(struct nsim_fib_rt, key), + .head_offset = offsetof(struct nsim_fib_rt, ht_node), + .key_len = sizeof(struct nsim_fib_rt_key), + .automatic_shrinking = true, +}; + +u64 nsim_fib_get_val(struct nsim_fib_data *fib_data, + enum nsim_resource_id res_id, bool max) +{ + 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; +} + +static void nsim_fib_set_max(struct nsim_fib_data *fib_data, + enum nsim_resource_id res_id, u64 val) +{ + 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: + WARN_ON(1); + return; + } + entry->max = val; +} + +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 nsim_fib_data *data, + struct fib_notifier_info *info, bool add) +{ + 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 void nsim_fib_rt_init(struct nsim_fib_data *data, + struct nsim_fib_rt *fib_rt, const void *addr, + size_t addr_len, unsigned int prefix_len, + int family, u32 tb_id) +{ + memcpy(fib_rt->key.addr, addr, addr_len); + fib_rt->key.prefix_len = prefix_len; + fib_rt->key.family = family; + fib_rt->key.tb_id = tb_id; + list_add(&fib_rt->list, &data->fib_rt_list); +} + +static void nsim_fib_rt_fini(struct nsim_fib_rt *fib_rt) +{ + list_del(&fib_rt->list); +} + +static struct nsim_fib_rt *nsim_fib_rt_lookup(struct rhashtable *fib_rt_ht, + const void *addr, size_t addr_len, + unsigned int prefix_len, + int family, u32 tb_id) +{ + struct nsim_fib_rt_key key; + + memset(&key, 0, sizeof(key)); + memcpy(key.addr, addr, addr_len); + key.prefix_len = prefix_len; + key.family = family; + key.tb_id = tb_id; + + return rhashtable_lookup_fast(fib_rt_ht, &key, nsim_fib_rt_ht_params); +} + +static struct nsim_fib4_rt * +nsim_fib4_rt_create(struct nsim_fib_data *data, + struct fib_entry_notifier_info *fen_info) +{ + struct nsim_fib4_rt *fib4_rt; + + fib4_rt = kzalloc(sizeof(*fib4_rt), GFP_ATOMIC); + if (!fib4_rt) + return NULL; + + nsim_fib_rt_init(data, &fib4_rt->common, &fen_info->dst, sizeof(u32), + fen_info->dst_len, AF_INET, fen_info->tb_id); + + fib4_rt->fi = fen_info->fi; + fib_info_hold(fib4_rt->fi); + fib4_rt->tos = fen_info->tos; + fib4_rt->type = fen_info->type; + + return fib4_rt; +} + +static void nsim_fib4_rt_destroy(struct nsim_fib4_rt *fib4_rt) +{ + fib_info_put(fib4_rt->fi); + nsim_fib_rt_fini(&fib4_rt->common); + kfree(fib4_rt); +} + +static struct nsim_fib4_rt * +nsim_fib4_rt_lookup(struct rhashtable *fib_rt_ht, + const struct fib_entry_notifier_info *fen_info) +{ + struct nsim_fib_rt *fib_rt; + + fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &fen_info->dst, sizeof(u32), + fen_info->dst_len, AF_INET, + fen_info->tb_id); + if (!fib_rt) + return NULL; + + return container_of(fib_rt, struct nsim_fib4_rt, common); +} + +static void nsim_fib4_rt_hw_flags_set(struct net *net, + const struct nsim_fib4_rt *fib4_rt, + bool trap) +{ + u32 *p_dst = (u32 *) fib4_rt->common.key.addr; + int dst_len = fib4_rt->common.key.prefix_len; + struct fib_rt_info fri; + + fri.fi = fib4_rt->fi; + fri.tb_id = fib4_rt->common.key.tb_id; + fri.dst = cpu_to_be32(*p_dst); + fri.dst_len = dst_len; + fri.tos = fib4_rt->tos; + fri.type = fib4_rt->type; + fri.offload = false; + fri.trap = trap; + fib_alias_hw_flags_set(net, &fri); +} + +static int nsim_fib4_rt_add(struct nsim_fib_data *data, + struct nsim_fib4_rt *fib4_rt, + struct netlink_ext_ack *extack) +{ + struct net *net = devlink_net(data->devlink); + int err; + + err = nsim_fib_account(&data->ipv4.fib, true, extack); + if (err) + return err; + + err = rhashtable_insert_fast(&data->fib_rt_ht, + &fib4_rt->common.ht_node, + nsim_fib_rt_ht_params); + if (err) { + NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv4 route"); + goto err_fib_dismiss; + } + + nsim_fib4_rt_hw_flags_set(net, fib4_rt, true); + + return 0; + +err_fib_dismiss: + nsim_fib_account(&data->ipv4.fib, false, extack); + return err; +} + +static int nsim_fib4_rt_replace(struct nsim_fib_data *data, + struct nsim_fib4_rt *fib4_rt, + struct nsim_fib4_rt *fib4_rt_old, + struct netlink_ext_ack *extack) +{ + struct net *net = devlink_net(data->devlink); + int err; + + /* We are replacing a route, so no need to change the accounting. */ + err = rhashtable_replace_fast(&data->fib_rt_ht, + &fib4_rt_old->common.ht_node, + &fib4_rt->common.ht_node, + nsim_fib_rt_ht_params); + if (err) { + NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv4 route"); + return err; + } + + nsim_fib4_rt_hw_flags_set(net, fib4_rt, true); + + nsim_fib4_rt_hw_flags_set(net, fib4_rt_old, false); + nsim_fib4_rt_destroy(fib4_rt_old); + + return 0; +} + +static int nsim_fib4_rt_insert(struct nsim_fib_data *data, + struct fib_entry_notifier_info *fen_info) +{ + struct netlink_ext_ack *extack = fen_info->info.extack; + struct nsim_fib4_rt *fib4_rt, *fib4_rt_old; + int err; + + fib4_rt = nsim_fib4_rt_create(data, fen_info); + if (!fib4_rt) + return -ENOMEM; + + fib4_rt_old = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info); + if (!fib4_rt_old) + err = nsim_fib4_rt_add(data, fib4_rt, extack); + else + err = nsim_fib4_rt_replace(data, fib4_rt, fib4_rt_old, extack); + + if (err) + nsim_fib4_rt_destroy(fib4_rt); + + return err; +} + +static void nsim_fib4_rt_remove(struct nsim_fib_data *data, + const struct fib_entry_notifier_info *fen_info) +{ + struct netlink_ext_ack *extack = fen_info->info.extack; + struct nsim_fib4_rt *fib4_rt; + + fib4_rt = nsim_fib4_rt_lookup(&data->fib_rt_ht, fen_info); + if (WARN_ON_ONCE(!fib4_rt)) + return; + + rhashtable_remove_fast(&data->fib_rt_ht, &fib4_rt->common.ht_node, + nsim_fib_rt_ht_params); + nsim_fib_account(&data->ipv4.fib, false, extack); + nsim_fib4_rt_destroy(fib4_rt); +} + +static int nsim_fib4_event(struct nsim_fib_data *data, + struct fib_notifier_info *info, + unsigned long event) +{ + struct fib_entry_notifier_info *fen_info; + int err = 0; + + fen_info = container_of(info, struct fib_entry_notifier_info, info); + + if (fen_info->fi->nh) { + NL_SET_ERR_MSG_MOD(info->extack, "IPv4 route with nexthop objects is not supported"); + return 0; + } + + switch (event) { + case FIB_EVENT_ENTRY_REPLACE: + err = nsim_fib4_rt_insert(data, fen_info); + break; + case FIB_EVENT_ENTRY_DEL: + nsim_fib4_rt_remove(data, fen_info); + break; + default: + break; + } + + return err; +} + +static struct nsim_fib6_rt_nh * +nsim_fib6_rt_nh_find(const struct nsim_fib6_rt *fib6_rt, + const struct fib6_info *rt) +{ + struct nsim_fib6_rt_nh *fib6_rt_nh; + + list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list) { + if (fib6_rt_nh->rt == rt) + return fib6_rt_nh; + } + + return NULL; +} + +static int nsim_fib6_rt_nh_add(struct nsim_fib6_rt *fib6_rt, + struct fib6_info *rt) +{ + struct nsim_fib6_rt_nh *fib6_rt_nh; + + fib6_rt_nh = kzalloc(sizeof(*fib6_rt_nh), GFP_ATOMIC); + if (!fib6_rt_nh) + return -ENOMEM; + + fib6_info_hold(rt); + fib6_rt_nh->rt = rt; + list_add_tail(&fib6_rt_nh->list, &fib6_rt->nh_list); + fib6_rt->nhs++; + + return 0; +} + +static void nsim_fib6_rt_nh_del(struct nsim_fib6_rt *fib6_rt, + const struct fib6_info *rt) +{ + struct nsim_fib6_rt_nh *fib6_rt_nh; + + fib6_rt_nh = nsim_fib6_rt_nh_find(fib6_rt, rt); + if (WARN_ON_ONCE(!fib6_rt_nh)) + return; + + fib6_rt->nhs--; + list_del(&fib6_rt_nh->list); +#if IS_ENABLED(CONFIG_IPV6) + fib6_info_release(fib6_rt_nh->rt); +#endif + kfree(fib6_rt_nh); +} + +static struct nsim_fib6_rt * +nsim_fib6_rt_create(struct nsim_fib_data *data, + struct fib6_entry_notifier_info *fen6_info) +{ + struct fib6_info *iter, *rt = fen6_info->rt; + struct nsim_fib6_rt *fib6_rt; + int i = 0; + int err; + + fib6_rt = kzalloc(sizeof(*fib6_rt), GFP_ATOMIC); + if (!fib6_rt) + return ERR_PTR(-ENOMEM); + + nsim_fib_rt_init(data, &fib6_rt->common, &rt->fib6_dst.addr, + sizeof(rt->fib6_dst.addr), rt->fib6_dst.plen, AF_INET6, + rt->fib6_table->tb6_id); + + /* We consider a multipath IPv6 route as one entry, but it can be made + * up from several fib6_info structs (one for each nexthop), so we + * add them all to the same list under the entry. + */ + INIT_LIST_HEAD(&fib6_rt->nh_list); + + err = nsim_fib6_rt_nh_add(fib6_rt, rt); + if (err) + goto err_fib_rt_fini; + + if (!fen6_info->nsiblings) + return fib6_rt; + + list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { + if (i == fen6_info->nsiblings) + break; + + err = nsim_fib6_rt_nh_add(fib6_rt, iter); + if (err) + goto err_fib6_rt_nh_del; + i++; + } + WARN_ON_ONCE(i != fen6_info->nsiblings); + + return fib6_rt; + +err_fib6_rt_nh_del: + list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings, + fib6_siblings) + nsim_fib6_rt_nh_del(fib6_rt, iter); + nsim_fib6_rt_nh_del(fib6_rt, rt); +err_fib_rt_fini: + nsim_fib_rt_fini(&fib6_rt->common); + kfree(fib6_rt); + return ERR_PTR(err); +} + +static void nsim_fib6_rt_destroy(struct nsim_fib6_rt *fib6_rt) +{ + struct nsim_fib6_rt_nh *iter, *tmp; + + list_for_each_entry_safe(iter, tmp, &fib6_rt->nh_list, list) + nsim_fib6_rt_nh_del(fib6_rt, iter->rt); + WARN_ON_ONCE(!list_empty(&fib6_rt->nh_list)); + nsim_fib_rt_fini(&fib6_rt->common); + kfree(fib6_rt); +} + +static struct nsim_fib6_rt * +nsim_fib6_rt_lookup(struct rhashtable *fib_rt_ht, const struct fib6_info *rt) +{ + struct nsim_fib_rt *fib_rt; + + fib_rt = nsim_fib_rt_lookup(fib_rt_ht, &rt->fib6_dst.addr, + sizeof(rt->fib6_dst.addr), + rt->fib6_dst.plen, AF_INET6, + rt->fib6_table->tb6_id); + if (!fib_rt) + return NULL; + + return container_of(fib_rt, struct nsim_fib6_rt, common); +} + +static int nsim_fib6_rt_append(struct nsim_fib_data *data, + struct fib6_entry_notifier_info *fen6_info) +{ + struct fib6_info *iter, *rt = fen6_info->rt; + struct nsim_fib6_rt *fib6_rt; + int i = 0; + int err; + + fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, rt); + if (WARN_ON_ONCE(!fib6_rt)) + return -EINVAL; + + err = nsim_fib6_rt_nh_add(fib6_rt, rt); + if (err) + return err; + rt->trap = true; + + if (!fen6_info->nsiblings) + return 0; + + list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { + if (i == fen6_info->nsiblings) + break; + + err = nsim_fib6_rt_nh_add(fib6_rt, iter); + if (err) + goto err_fib6_rt_nh_del; + iter->trap = true; + i++; + } + WARN_ON_ONCE(i != fen6_info->nsiblings); + + return 0; + +err_fib6_rt_nh_del: + list_for_each_entry_continue_reverse(iter, &rt->fib6_siblings, + fib6_siblings) { + iter->trap = false; + nsim_fib6_rt_nh_del(fib6_rt, iter); + } + rt->trap = false; + nsim_fib6_rt_nh_del(fib6_rt, rt); + return err; +} + +static void nsim_fib6_rt_hw_flags_set(const struct nsim_fib6_rt *fib6_rt, + bool trap) +{ + struct nsim_fib6_rt_nh *fib6_rt_nh; + + list_for_each_entry(fib6_rt_nh, &fib6_rt->nh_list, list) + fib6_info_hw_flags_set(fib6_rt_nh->rt, false, trap); +} + +static int nsim_fib6_rt_add(struct nsim_fib_data *data, + struct nsim_fib6_rt *fib6_rt, + struct netlink_ext_ack *extack) +{ + int err; + + err = nsim_fib_account(&data->ipv6.fib, true, extack); + if (err) + return err; + + err = rhashtable_insert_fast(&data->fib_rt_ht, + &fib6_rt->common.ht_node, + nsim_fib_rt_ht_params); + if (err) { + NL_SET_ERR_MSG_MOD(extack, "Failed to insert IPv6 route"); + goto err_fib_dismiss; + } + + nsim_fib6_rt_hw_flags_set(fib6_rt, true); + + return 0; + +err_fib_dismiss: + nsim_fib_account(&data->ipv6.fib, false, extack); + return err; +} + +static int nsim_fib6_rt_replace(struct nsim_fib_data *data, + struct nsim_fib6_rt *fib6_rt, + struct nsim_fib6_rt *fib6_rt_old, + struct netlink_ext_ack *extack) +{ + int err; + + /* We are replacing a route, so no need to change the accounting. */ + err = rhashtable_replace_fast(&data->fib_rt_ht, + &fib6_rt_old->common.ht_node, + &fib6_rt->common.ht_node, + nsim_fib_rt_ht_params); + if (err) { + NL_SET_ERR_MSG_MOD(extack, "Failed to replace IPv6 route"); + return err; + } + + nsim_fib6_rt_hw_flags_set(fib6_rt, true); + + nsim_fib6_rt_hw_flags_set(fib6_rt_old, false); + nsim_fib6_rt_destroy(fib6_rt_old); + + return 0; +} + +static int nsim_fib6_rt_insert(struct nsim_fib_data *data, + struct fib6_entry_notifier_info *fen6_info) +{ + struct netlink_ext_ack *extack = fen6_info->info.extack; + struct nsim_fib6_rt *fib6_rt, *fib6_rt_old; + int err; + + fib6_rt = nsim_fib6_rt_create(data, fen6_info); + if (IS_ERR(fib6_rt)) + return PTR_ERR(fib6_rt); + + fib6_rt_old = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt); + if (!fib6_rt_old) + err = nsim_fib6_rt_add(data, fib6_rt, extack); + else + err = nsim_fib6_rt_replace(data, fib6_rt, fib6_rt_old, extack); + + if (err) + nsim_fib6_rt_destroy(fib6_rt); + + return err; +} + +static void +nsim_fib6_rt_remove(struct nsim_fib_data *data, + const struct fib6_entry_notifier_info *fen6_info) +{ + struct netlink_ext_ack *extack = fen6_info->info.extack; + struct nsim_fib6_rt *fib6_rt; + + /* Multipath routes are first added to the FIB trie and only then + * notified. If we vetoed the addition, we will get a delete + * notification for a route we do not have. Therefore, do not warn if + * route was not found. + */ + fib6_rt = nsim_fib6_rt_lookup(&data->fib_rt_ht, fen6_info->rt); + if (!fib6_rt) + return; + + /* If not all the nexthops are deleted, then only reduce the nexthop + * group. + */ + if (fen6_info->nsiblings + 1 != fib6_rt->nhs) { + nsim_fib6_rt_nh_del(fib6_rt, fen6_info->rt); + return; + } + + rhashtable_remove_fast(&data->fib_rt_ht, &fib6_rt->common.ht_node, + nsim_fib_rt_ht_params); + nsim_fib_account(&data->ipv6.fib, false, extack); + nsim_fib6_rt_destroy(fib6_rt); +} + +static int nsim_fib6_event(struct nsim_fib_data *data, + struct fib_notifier_info *info, + unsigned long event) +{ + struct fib6_entry_notifier_info *fen6_info; + int err = 0; + + fen6_info = container_of(info, struct fib6_entry_notifier_info, info); + + if (fen6_info->rt->nh) { + NL_SET_ERR_MSG_MOD(info->extack, "IPv6 route with nexthop objects is not supported"); + return 0; + } + + if (fen6_info->rt->fib6_src.plen) { + NL_SET_ERR_MSG_MOD(info->extack, "IPv6 source-specific route is not supported"); + return 0; + } + + switch (event) { + case FIB_EVENT_ENTRY_REPLACE: + err = nsim_fib6_rt_insert(data, fen6_info); + break; + case FIB_EVENT_ENTRY_APPEND: + err = nsim_fib6_rt_append(data, fen6_info); + break; + case FIB_EVENT_ENTRY_DEL: + nsim_fib6_rt_remove(data, fen6_info); + break; + default: + break; + } + + return err; +} + +static int nsim_fib_event(struct nsim_fib_data *data, + struct fib_notifier_info *info, unsigned long event) +{ + int err = 0; + + switch (info->family) { + case AF_INET: + err = nsim_fib4_event(data, info, event); + break; + case AF_INET6: + err = nsim_fib6_event(data, info, event); + break; + } + + return err; +} + +static int nsim_fib_event_nb(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data, + fib_nb); + struct fib_notifier_info *info = ptr; + int err = 0; + + /* IPv6 routes can be added via RAs from softIRQ. */ + spin_lock_bh(&data->fib_lock); + + switch (event) { + case FIB_EVENT_RULE_ADD: + case FIB_EVENT_RULE_DEL: + err = nsim_fib_rule_event(data, info, + event == FIB_EVENT_RULE_ADD); + break; + + case FIB_EVENT_ENTRY_REPLACE: + case FIB_EVENT_ENTRY_APPEND: + case FIB_EVENT_ENTRY_DEL: + err = nsim_fib_event(data, info, event); + break; + } + + spin_unlock_bh(&data->fib_lock); + + return notifier_from_errno(err); +} + +static void nsim_fib4_rt_free(struct nsim_fib_rt *fib_rt, + struct nsim_fib_data *data) +{ + struct devlink *devlink = data->devlink; + struct nsim_fib4_rt *fib4_rt; + + fib4_rt = container_of(fib_rt, struct nsim_fib4_rt, common); + nsim_fib4_rt_hw_flags_set(devlink_net(devlink), fib4_rt, false); + nsim_fib_account(&data->ipv4.fib, false, NULL); + nsim_fib4_rt_destroy(fib4_rt); +} + +static void nsim_fib6_rt_free(struct nsim_fib_rt *fib_rt, + struct nsim_fib_data *data) +{ + struct nsim_fib6_rt *fib6_rt; + + fib6_rt = container_of(fib_rt, struct nsim_fib6_rt, common); + nsim_fib6_rt_hw_flags_set(fib6_rt, false); + nsim_fib_account(&data->ipv6.fib, false, NULL); + nsim_fib6_rt_destroy(fib6_rt); +} + +static void nsim_fib_rt_free(void *ptr, void *arg) +{ + struct nsim_fib_rt *fib_rt = ptr; + struct nsim_fib_data *data = arg; + + switch (fib_rt->key.family) { + case AF_INET: + nsim_fib4_rt_free(fib_rt, data); + break; + case AF_INET6: + nsim_fib6_rt_free(fib_rt, data); + break; + default: + WARN_ON_ONCE(1); + } +} + +/* inconsistent dump, trying again */ +static void nsim_fib_dump_inconsistent(struct notifier_block *nb) +{ + struct nsim_fib_data *data = container_of(nb, struct nsim_fib_data, + fib_nb); + struct nsim_fib_rt *fib_rt, *fib_rt_tmp; + + /* The notifier block is still not registered, so we do not need to + * take any locks here. + */ + list_for_each_entry_safe(fib_rt, fib_rt_tmp, &data->fib_rt_list, list) { + rhashtable_remove_fast(&data->fib_rt_ht, &fib_rt->ht_node, + nsim_fib_rt_ht_params); + nsim_fib_rt_free(fib_rt, data); + } + + data->ipv4.rules.num = 0ULL; + data->ipv6.rules.num = 0ULL; +} + +static u64 nsim_fib_ipv4_resource_occ_get(void *priv) +{ + struct nsim_fib_data *data = priv; + + return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB, false); +} + +static u64 nsim_fib_ipv4_rules_res_occ_get(void *priv) +{ + struct nsim_fib_data *data = priv; + + return nsim_fib_get_val(data, NSIM_RESOURCE_IPV4_FIB_RULES, false); +} + +static u64 nsim_fib_ipv6_resource_occ_get(void *priv) +{ + struct nsim_fib_data *data = priv; + + return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB, false); +} + +static u64 nsim_fib_ipv6_rules_res_occ_get(void *priv) +{ + struct nsim_fib_data *data = priv; + + return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB_RULES, false); +} + +static void nsim_fib_set_max_all(struct nsim_fib_data *data, + 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 + }; + 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) + val = (u64) -1; + nsim_fib_set_max(data, res_ids[i], val); + } +} + +struct nsim_fib_data *nsim_fib_create(struct devlink *devlink, + struct netlink_ext_ack *extack) +{ + struct nsim_fib_data *data; + int err; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return ERR_PTR(-ENOMEM); + data->devlink = devlink; + + spin_lock_init(&data->fib_lock); + INIT_LIST_HEAD(&data->fib_rt_list); + err = rhashtable_init(&data->fib_rt_ht, &nsim_fib_rt_ht_params); + if (err) + goto err_data_free; + + nsim_fib_set_max_all(data, devlink); + + data->fib_nb.notifier_call = nsim_fib_event_nb; + err = register_fib_notifier(devlink_net(devlink), &data->fib_nb, + nsim_fib_dump_inconsistent, extack); + if (err) { + pr_err("Failed to register fib notifier\n"); + goto err_rhashtable_destroy; + } + + devlink_resource_occ_get_register(devlink, + NSIM_RESOURCE_IPV4_FIB, + nsim_fib_ipv4_resource_occ_get, + data); + devlink_resource_occ_get_register(devlink, + NSIM_RESOURCE_IPV4_FIB_RULES, + nsim_fib_ipv4_rules_res_occ_get, + data); + devlink_resource_occ_get_register(devlink, + NSIM_RESOURCE_IPV6_FIB, + nsim_fib_ipv6_resource_occ_get, + data); + devlink_resource_occ_get_register(devlink, + NSIM_RESOURCE_IPV6_FIB_RULES, + nsim_fib_ipv6_rules_res_occ_get, + data); + return data; + +err_rhashtable_destroy: + rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free, + data); +err_data_free: + kfree(data); + return ERR_PTR(err); +} + +void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *data) +{ + devlink_resource_occ_get_unregister(devlink, + NSIM_RESOURCE_IPV6_FIB_RULES); + devlink_resource_occ_get_unregister(devlink, + NSIM_RESOURCE_IPV6_FIB); + devlink_resource_occ_get_unregister(devlink, + NSIM_RESOURCE_IPV4_FIB_RULES); + devlink_resource_occ_get_unregister(devlink, + NSIM_RESOURCE_IPV4_FIB); + unregister_fib_notifier(devlink_net(devlink), &data->fib_nb); + rhashtable_free_and_destroy(&data->fib_rt_ht, nsim_fib_rt_free, + data); + WARN_ON_ONCE(!list_empty(&data->fib_rt_list)); + kfree(data); +} diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c new file mode 100644 index 000000000..21e297466 --- /dev/null +++ b/drivers/net/netdevsim/health.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */ + +#include <linux/debugfs.h> +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/slab.h> + +#include "netdevsim.h" + +static int +nsim_dev_empty_reporter_dump(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, void *priv_ctx, + struct netlink_ext_ack *extack) +{ + return 0; +} + +static int +nsim_dev_empty_reporter_diagnose(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, + struct netlink_ext_ack *extack) +{ + return 0; +} + +static const +struct devlink_health_reporter_ops nsim_dev_empty_reporter_ops = { + .name = "empty", + .dump = nsim_dev_empty_reporter_dump, + .diagnose = nsim_dev_empty_reporter_diagnose, +}; + +struct nsim_dev_dummy_reporter_ctx { + char *break_msg; +}; + +static int +nsim_dev_dummy_reporter_recover(struct devlink_health_reporter *reporter, + void *priv_ctx, + struct netlink_ext_ack *extack) +{ + struct nsim_dev_health *health = devlink_health_reporter_priv(reporter); + struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx; + + if (health->fail_recover) { + /* For testing purposes, user set debugfs fail_recover + * value to true. Fail right away. + */ + NL_SET_ERR_MSG_MOD(extack, "User setup the recover to fail for testing purposes"); + return -EINVAL; + } + if (ctx) { + kfree(health->recovered_break_msg); + health->recovered_break_msg = kstrdup(ctx->break_msg, + GFP_KERNEL); + if (!health->recovered_break_msg) + return -ENOMEM; + } + return 0; +} + +static int nsim_dev_dummy_fmsg_put(struct devlink_fmsg *fmsg, u32 binary_len) +{ + char *binary; + int err; + int i; + + err = devlink_fmsg_bool_pair_put(fmsg, "test_bool", true); + if (err) + return err; + err = devlink_fmsg_u8_pair_put(fmsg, "test_u8", 1); + if (err) + return err; + err = devlink_fmsg_u32_pair_put(fmsg, "test_u32", 3); + if (err) + return err; + err = devlink_fmsg_u64_pair_put(fmsg, "test_u64", 4); + if (err) + return err; + err = devlink_fmsg_string_pair_put(fmsg, "test_string", "somestring"); + if (err) + return err; + + binary = kmalloc(binary_len, GFP_KERNEL | __GFP_NOWARN); + if (!binary) + return -ENOMEM; + get_random_bytes(binary, binary_len); + err = devlink_fmsg_binary_pair_put(fmsg, "test_binary", binary, binary_len); + kfree(binary); + if (err) + return err; + + err = devlink_fmsg_pair_nest_start(fmsg, "test_nest"); + if (err) + return err; + err = devlink_fmsg_obj_nest_start(fmsg); + if (err) + return err; + err = devlink_fmsg_bool_pair_put(fmsg, "nested_test_bool", false); + if (err) + return err; + err = devlink_fmsg_u8_pair_put(fmsg, "nested_test_u8", false); + if (err) + return err; + err = devlink_fmsg_obj_nest_end(fmsg); + if (err) + return err; + err = devlink_fmsg_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_bool_array"); + if (err) + return err; + for (i = 0; i < 10; i++) { + err = devlink_fmsg_bool_put(fmsg, true); + if (err) + return err; + } + err = devlink_fmsg_arr_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_u8_array"); + if (err) + return err; + for (i = 0; i < 10; i++) { + err = devlink_fmsg_u8_put(fmsg, i); + if (err) + return err; + } + err = devlink_fmsg_arr_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_u32_array"); + if (err) + return err; + for (i = 0; i < 10; i++) { + err = devlink_fmsg_u32_put(fmsg, i); + if (err) + return err; + } + err = devlink_fmsg_arr_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_u64_array"); + if (err) + return err; + for (i = 0; i < 10; i++) { + err = devlink_fmsg_u64_put(fmsg, i); + if (err) + return err; + } + err = devlink_fmsg_arr_pair_nest_end(fmsg); + if (err) + return err; + + err = devlink_fmsg_arr_pair_nest_start(fmsg, "test_array_of_objects"); + if (err) + return err; + for (i = 0; i < 10; i++) { + err = devlink_fmsg_obj_nest_start(fmsg); + if (err) + return err; + err = devlink_fmsg_bool_pair_put(fmsg, + "in_array_nested_test_bool", + false); + if (err) + return err; + err = devlink_fmsg_u8_pair_put(fmsg, + "in_array_nested_test_u8", + i); + if (err) + return err; + err = devlink_fmsg_obj_nest_end(fmsg); + if (err) + return err; + } + return devlink_fmsg_arr_pair_nest_end(fmsg); +} + +static int +nsim_dev_dummy_reporter_dump(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, void *priv_ctx, + struct netlink_ext_ack *extack) +{ + struct nsim_dev_health *health = devlink_health_reporter_priv(reporter); + struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx; + int err; + + if (ctx) { + err = devlink_fmsg_string_pair_put(fmsg, "break_message", + ctx->break_msg); + if (err) + return err; + } + return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len); +} + +static int +nsim_dev_dummy_reporter_diagnose(struct devlink_health_reporter *reporter, + struct devlink_fmsg *fmsg, + struct netlink_ext_ack *extack) +{ + struct nsim_dev_health *health = devlink_health_reporter_priv(reporter); + int err; + + if (health->recovered_break_msg) { + err = devlink_fmsg_string_pair_put(fmsg, + "recovered_break_message", + health->recovered_break_msg); + if (err) + return err; + } + return nsim_dev_dummy_fmsg_put(fmsg, health->binary_len); +} + +static const +struct devlink_health_reporter_ops nsim_dev_dummy_reporter_ops = { + .name = "dummy", + .recover = nsim_dev_dummy_reporter_recover, + .dump = nsim_dev_dummy_reporter_dump, + .diagnose = nsim_dev_dummy_reporter_diagnose, +}; + +static ssize_t nsim_dev_health_break_write(struct file *file, + const char __user *data, + size_t count, loff_t *ppos) +{ + struct nsim_dev_health *health = file->private_data; + struct nsim_dev_dummy_reporter_ctx ctx; + char *break_msg; + int err; + + break_msg = kmalloc(count + 1, GFP_KERNEL); + if (!break_msg) + return -ENOMEM; + + if (copy_from_user(break_msg, data, count)) { + err = -EFAULT; + goto out; + } + break_msg[count] = '\0'; + if (break_msg[count - 1] == '\n') + break_msg[count - 1] = '\0'; + + ctx.break_msg = break_msg; + err = devlink_health_report(health->dummy_reporter, break_msg, &ctx); + if (err) + goto out; + +out: + kfree(break_msg); + return err ?: count; +} + +static const struct file_operations nsim_dev_health_break_fops = { + .open = simple_open, + .write = nsim_dev_health_break_write, + .llseek = generic_file_llseek, + .owner = THIS_MODULE, +}; + +int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink) +{ + struct nsim_dev_health *health = &nsim_dev->health; + int err; + + health->empty_reporter = + devlink_health_reporter_create(devlink, + &nsim_dev_empty_reporter_ops, + 0, health); + if (IS_ERR(health->empty_reporter)) + return PTR_ERR(health->empty_reporter); + + health->dummy_reporter = + devlink_health_reporter_create(devlink, + &nsim_dev_dummy_reporter_ops, + 0, health); + if (IS_ERR(health->dummy_reporter)) { + err = PTR_ERR(health->dummy_reporter); + goto err_empty_reporter_destroy; + } + + health->ddir = debugfs_create_dir("health", nsim_dev->ddir); + if (IS_ERR(health->ddir)) { + err = PTR_ERR(health->ddir); + goto err_dummy_reporter_destroy; + } + + health->recovered_break_msg = NULL; + debugfs_create_file("break_health", 0200, health->ddir, health, + &nsim_dev_health_break_fops); + health->binary_len = 16; + debugfs_create_u32("binary_len", 0600, health->ddir, + &health->binary_len); + health->fail_recover = false; + debugfs_create_bool("fail_recover", 0600, health->ddir, + &health->fail_recover); + return 0; + +err_dummy_reporter_destroy: + devlink_health_reporter_destroy(health->dummy_reporter); +err_empty_reporter_destroy: + devlink_health_reporter_destroy(health->empty_reporter); + return err; +} + +void nsim_dev_health_exit(struct nsim_dev *nsim_dev) +{ + struct nsim_dev_health *health = &nsim_dev->health; + + debugfs_remove_recursive(health->ddir); + kfree(health->recovered_break_msg); + devlink_health_reporter_destroy(health->dummy_reporter); + devlink_health_reporter_destroy(health->empty_reporter); +} diff --git a/drivers/net/netdevsim/ipsec.c b/drivers/net/netdevsim/ipsec.c new file mode 100644 index 000000000..b80ed2ffd --- /dev/null +++ b/drivers/net/netdevsim/ipsec.c @@ -0,0 +1,299 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2018 Oracle and/or its affiliates. All rights reserved. */ + +#include <crypto/aead.h> +#include <linux/debugfs.h> +#include <net/xfrm.h> + +#include "netdevsim.h" + +#define NSIM_IPSEC_AUTH_BITS 128 + +static ssize_t nsim_dbg_netdev_ops_read(struct file *filp, + char __user *buffer, + size_t count, loff_t *ppos) +{ + struct netdevsim *ns = filp->private_data; + struct nsim_ipsec *ipsec = &ns->ipsec; + size_t bufsize; + char *buf, *p; + int len; + int i; + + /* the buffer needed is + * (num SAs * 3 lines each * ~60 bytes per line) + one more line + */ + bufsize = (ipsec->count * 4 * 60) + 60; + buf = kzalloc(bufsize, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + p = buf; + p += scnprintf(p, bufsize - (p - buf), + "SA count=%u tx=%u\n", + ipsec->count, ipsec->tx); + + for (i = 0; i < NSIM_IPSEC_MAX_SA_COUNT; i++) { + struct nsim_sa *sap = &ipsec->sa[i]; + + if (!sap->used) + continue; + + p += scnprintf(p, bufsize - (p - buf), + "sa[%i] %cx ipaddr=0x%08x %08x %08x %08x\n", + i, (sap->rx ? 'r' : 't'), sap->ipaddr[0], + sap->ipaddr[1], sap->ipaddr[2], sap->ipaddr[3]); + p += scnprintf(p, bufsize - (p - buf), + "sa[%i] spi=0x%08x proto=0x%x salt=0x%08x crypt=%d\n", + i, be32_to_cpu(sap->xs->id.spi), + sap->xs->id.proto, sap->salt, sap->crypt); + p += scnprintf(p, bufsize - (p - buf), + "sa[%i] key=0x%08x %08x %08x %08x\n", + i, sap->key[0], sap->key[1], + sap->key[2], sap->key[3]); + } + + len = simple_read_from_buffer(buffer, count, ppos, buf, p - buf); + + kfree(buf); + return len; +} + +static const struct file_operations ipsec_dbg_fops = { + .owner = THIS_MODULE, + .open = simple_open, + .read = nsim_dbg_netdev_ops_read, +}; + +static int nsim_ipsec_find_empty_idx(struct nsim_ipsec *ipsec) +{ + u32 i; + + if (ipsec->count == NSIM_IPSEC_MAX_SA_COUNT) + return -ENOSPC; + + /* search sa table */ + for (i = 0; i < NSIM_IPSEC_MAX_SA_COUNT; i++) { + if (!ipsec->sa[i].used) + return i; + } + + return -ENOSPC; +} + +static int nsim_ipsec_parse_proto_keys(struct xfrm_state *xs, + u32 *mykey, u32 *mysalt) +{ + const char aes_gcm_name[] = "rfc4106(gcm(aes))"; + struct net_device *dev = xs->xso.real_dev; + unsigned char *key_data; + char *alg_name = NULL; + int key_len; + + if (!xs->aead) { + netdev_err(dev, "Unsupported IPsec algorithm\n"); + return -EINVAL; + } + + if (xs->aead->alg_icv_len != NSIM_IPSEC_AUTH_BITS) { + netdev_err(dev, "IPsec offload requires %d bit authentication\n", + NSIM_IPSEC_AUTH_BITS); + return -EINVAL; + } + + key_data = &xs->aead->alg_key[0]; + key_len = xs->aead->alg_key_len; + alg_name = xs->aead->alg_name; + + if (strcmp(alg_name, aes_gcm_name)) { + netdev_err(dev, "Unsupported IPsec algorithm - please use %s\n", + aes_gcm_name); + return -EINVAL; + } + + /* 160 accounts for 16 byte key and 4 byte salt */ + if (key_len > NSIM_IPSEC_AUTH_BITS) { + *mysalt = ((u32 *)key_data)[4]; + } else if (key_len == NSIM_IPSEC_AUTH_BITS) { + *mysalt = 0; + } else { + netdev_err(dev, "IPsec hw offload only supports 128 bit keys with optional 32 bit salt\n"); + return -EINVAL; + } + memcpy(mykey, key_data, 16); + + return 0; +} + +static int nsim_ipsec_add_sa(struct xfrm_state *xs) +{ + struct nsim_ipsec *ipsec; + struct net_device *dev; + struct netdevsim *ns; + struct nsim_sa sa; + u16 sa_idx; + int ret; + + dev = xs->xso.real_dev; + ns = netdev_priv(dev); + ipsec = &ns->ipsec; + + if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) { + netdev_err(dev, "Unsupported protocol 0x%04x for ipsec offload\n", + xs->id.proto); + return -EINVAL; + } + + if (xs->calg) { + netdev_err(dev, "Compression offload not supported\n"); + return -EINVAL; + } + + /* find the first unused index */ + ret = nsim_ipsec_find_empty_idx(ipsec); + if (ret < 0) { + netdev_err(dev, "No space for SA in Rx table!\n"); + return ret; + } + sa_idx = (u16)ret; + + memset(&sa, 0, sizeof(sa)); + sa.used = true; + sa.xs = xs; + + if (sa.xs->id.proto & IPPROTO_ESP) + sa.crypt = xs->ealg || xs->aead; + + /* get the key and salt */ + ret = nsim_ipsec_parse_proto_keys(xs, sa.key, &sa.salt); + if (ret) { + netdev_err(dev, "Failed to get key data for SA table\n"); + return ret; + } + + if (xs->xso.flags & XFRM_OFFLOAD_INBOUND) { + sa.rx = true; + + if (xs->props.family == AF_INET6) + memcpy(sa.ipaddr, &xs->id.daddr.a6, 16); + else + memcpy(&sa.ipaddr[3], &xs->id.daddr.a4, 4); + } + + /* the preparations worked, so save the info */ + memcpy(&ipsec->sa[sa_idx], &sa, sizeof(sa)); + + /* the XFRM stack doesn't like offload_handle == 0, + * so add a bitflag in case our array index is 0 + */ + xs->xso.offload_handle = sa_idx | NSIM_IPSEC_VALID; + ipsec->count++; + + return 0; +} + +static void nsim_ipsec_del_sa(struct xfrm_state *xs) +{ + struct netdevsim *ns = netdev_priv(xs->xso.real_dev); + struct nsim_ipsec *ipsec = &ns->ipsec; + u16 sa_idx; + + sa_idx = xs->xso.offload_handle & ~NSIM_IPSEC_VALID; + if (!ipsec->sa[sa_idx].used) { + netdev_err(ns->netdev, "Invalid SA for delete sa_idx=%d\n", + sa_idx); + return; + } + + memset(&ipsec->sa[sa_idx], 0, sizeof(struct nsim_sa)); + ipsec->count--; +} + +static bool nsim_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) +{ + struct netdevsim *ns = netdev_priv(xs->xso.real_dev); + struct nsim_ipsec *ipsec = &ns->ipsec; + + ipsec->ok++; + + return true; +} + +static const struct xfrmdev_ops nsim_xfrmdev_ops = { + .xdo_dev_state_add = nsim_ipsec_add_sa, + .xdo_dev_state_delete = nsim_ipsec_del_sa, + .xdo_dev_offload_ok = nsim_ipsec_offload_ok, +}; + +bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb) +{ + struct sec_path *sp = skb_sec_path(skb); + struct nsim_ipsec *ipsec = &ns->ipsec; + struct xfrm_state *xs; + struct nsim_sa *tsa; + u32 sa_idx; + + /* do we even need to check this packet? */ + if (!sp) + return true; + + if (unlikely(!sp->len)) { + netdev_err(ns->netdev, "no xfrm state len = %d\n", + sp->len); + return false; + } + + xs = xfrm_input_state(skb); + if (unlikely(!xs)) { + netdev_err(ns->netdev, "no xfrm_input_state() xs = %p\n", xs); + return false; + } + + sa_idx = xs->xso.offload_handle & ~NSIM_IPSEC_VALID; + if (unlikely(sa_idx >= NSIM_IPSEC_MAX_SA_COUNT)) { + netdev_err(ns->netdev, "bad sa_idx=%d max=%d\n", + sa_idx, NSIM_IPSEC_MAX_SA_COUNT); + return false; + } + + tsa = &ipsec->sa[sa_idx]; + if (unlikely(!tsa->used)) { + netdev_err(ns->netdev, "unused sa_idx=%d\n", sa_idx); + return false; + } + + if (xs->id.proto != IPPROTO_ESP && xs->id.proto != IPPROTO_AH) { + netdev_err(ns->netdev, "unexpected proto=%d\n", xs->id.proto); + return false; + } + + ipsec->tx++; + + return true; +} + +void nsim_ipsec_init(struct netdevsim *ns) +{ + ns->netdev->xfrmdev_ops = &nsim_xfrmdev_ops; + +#define NSIM_ESP_FEATURES (NETIF_F_HW_ESP | \ + NETIF_F_HW_ESP_TX_CSUM | \ + NETIF_F_GSO_ESP) + + ns->netdev->features |= NSIM_ESP_FEATURES; + ns->netdev->hw_enc_features |= NSIM_ESP_FEATURES; + + ns->ipsec.pfile = debugfs_create_file("ipsec", 0400, + ns->nsim_dev_port->ddir, ns, + &ipsec_dbg_fops); +} + +void nsim_ipsec_teardown(struct netdevsim *ns) +{ + struct nsim_ipsec *ipsec = &ns->ipsec; + + if (ipsec->count) + netdev_err(ns->netdev, "tearing down IPsec offload with %d SAs left\n", + ipsec->count); + debugfs_remove_recursive(ipsec->pfile); +} diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c new file mode 100644 index 000000000..4fb0638a5 --- /dev/null +++ b/drivers/net/netdevsim/netdev.c @@ -0,0 +1,396 @@ +/* + * Copyright (C) 2017 Netronome Systems, Inc. + * + * 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/debugfs.h> +#include <linux/etherdevice.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/slab.h> +#include <net/netlink.h> +#include <net/pkt_cls.h> +#include <net/rtnetlink.h> +#include <net/udp_tunnel.h> + +#include "netdevsim.h" + +static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct netdevsim *ns = netdev_priv(dev); + + if (!nsim_ipsec_tx(ns, skb)) + goto out; + + u64_stats_update_begin(&ns->syncp); + ns->tx_packets++; + ns->tx_bytes += skb->len; + u64_stats_update_end(&ns->syncp); + +out: + dev_kfree_skb(skb); + + return NETDEV_TX_OK; +} + +static void nsim_set_rx_mode(struct net_device *dev) +{ +} + +static int nsim_change_mtu(struct net_device *dev, int new_mtu) +{ + struct netdevsim *ns = netdev_priv(dev); + + if (ns->xdp.prog && new_mtu > NSIM_XDP_MAX_MTU) + return -EBUSY; + + dev->mtu = new_mtu; + + return 0; +} + +static void +nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) +{ + struct netdevsim *ns = netdev_priv(dev); + unsigned int start; + + do { + start = u64_stats_fetch_begin_irq(&ns->syncp); + stats->tx_bytes = ns->tx_bytes; + stats->tx_packets = ns->tx_packets; + } while (u64_stats_fetch_retry_irq(&ns->syncp, start)); +} + +static int +nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv) +{ + return nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv); +} + +static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + /* Only refuse multicast addresses, zero address can mean unset/any. */ + if (vf >= nsim_bus_dev->num_vfs || is_multicast_ether_addr(mac)) + return -EINVAL; + memcpy(nsim_bus_dev->vfconfigs[vf].vf_mac, mac, ETH_ALEN); + + return 0; +} + +static int nsim_set_vf_vlan(struct net_device *dev, int vf, + u16 vlan, u8 qos, __be16 vlan_proto) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + if (vf >= nsim_bus_dev->num_vfs || vlan > 4095 || qos > 7) + return -EINVAL; + + nsim_bus_dev->vfconfigs[vf].vlan = vlan; + nsim_bus_dev->vfconfigs[vf].qos = qos; + nsim_bus_dev->vfconfigs[vf].vlan_proto = vlan_proto; + + return 0; +} + +static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + if (vf >= nsim_bus_dev->num_vfs) + return -EINVAL; + + nsim_bus_dev->vfconfigs[vf].min_tx_rate = min; + nsim_bus_dev->vfconfigs[vf].max_tx_rate = max; + + return 0; +} + +static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + if (vf >= nsim_bus_dev->num_vfs) + return -EINVAL; + nsim_bus_dev->vfconfigs[vf].spoofchk_enabled = val; + + return 0; +} + +static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + if (vf >= nsim_bus_dev->num_vfs) + return -EINVAL; + nsim_bus_dev->vfconfigs[vf].rss_query_enabled = val; + + return 0; +} + +static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + if (vf >= nsim_bus_dev->num_vfs) + return -EINVAL; + nsim_bus_dev->vfconfigs[vf].trusted = val; + + return 0; +} + +static int +nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + if (vf >= nsim_bus_dev->num_vfs) + return -EINVAL; + + ivi->vf = vf; + ivi->linkstate = nsim_bus_dev->vfconfigs[vf].link_state; + ivi->min_tx_rate = nsim_bus_dev->vfconfigs[vf].min_tx_rate; + ivi->max_tx_rate = nsim_bus_dev->vfconfigs[vf].max_tx_rate; + ivi->vlan = nsim_bus_dev->vfconfigs[vf].vlan; + ivi->vlan_proto = nsim_bus_dev->vfconfigs[vf].vlan_proto; + ivi->qos = nsim_bus_dev->vfconfigs[vf].qos; + memcpy(&ivi->mac, nsim_bus_dev->vfconfigs[vf].vf_mac, ETH_ALEN); + ivi->spoofchk = nsim_bus_dev->vfconfigs[vf].spoofchk_enabled; + ivi->trusted = nsim_bus_dev->vfconfigs[vf].trusted; + ivi->rss_query_en = nsim_bus_dev->vfconfigs[vf].rss_query_enabled; + + return 0; +} + +static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state) +{ + struct netdevsim *ns = netdev_priv(dev); + struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev; + + if (vf >= nsim_bus_dev->num_vfs) + return -EINVAL; + + switch (state) { + case IFLA_VF_LINK_STATE_AUTO: + case IFLA_VF_LINK_STATE_ENABLE: + case IFLA_VF_LINK_STATE_DISABLE: + break; + default: + return -EINVAL; + } + + nsim_bus_dev->vfconfigs[vf].link_state = state; + + return 0; +} + +static LIST_HEAD(nsim_block_cb_list); + +static int +nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data) +{ + struct netdevsim *ns = netdev_priv(dev); + + switch (type) { + case TC_SETUP_BLOCK: + return flow_block_cb_setup_simple(type_data, + &nsim_block_cb_list, + nsim_setup_tc_block_cb, + ns, ns, true); + default: + return -EOPNOTSUPP; + } +} + +static int +nsim_set_features(struct net_device *dev, netdev_features_t features) +{ + struct netdevsim *ns = netdev_priv(dev); + + if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC)) + return nsim_bpf_disable_tc(ns); + + return 0; +} + +static struct devlink_port *nsim_get_devlink_port(struct net_device *dev) +{ + struct netdevsim *ns = netdev_priv(dev); + + return &ns->nsim_dev_port->devlink_port; +} + +static const struct net_device_ops nsim_netdev_ops = { + .ndo_start_xmit = nsim_start_xmit, + .ndo_set_rx_mode = nsim_set_rx_mode, + .ndo_set_mac_address = eth_mac_addr, + .ndo_validate_addr = eth_validate_addr, + .ndo_change_mtu = nsim_change_mtu, + .ndo_get_stats64 = nsim_get_stats64, + .ndo_set_vf_mac = nsim_set_vf_mac, + .ndo_set_vf_vlan = nsim_set_vf_vlan, + .ndo_set_vf_rate = nsim_set_vf_rate, + .ndo_set_vf_spoofchk = nsim_set_vf_spoofchk, + .ndo_set_vf_trust = nsim_set_vf_trust, + .ndo_get_vf_config = nsim_get_vf_config, + .ndo_set_vf_link_state = nsim_set_vf_link_state, + .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en, + .ndo_setup_tc = nsim_setup_tc, + .ndo_set_features = nsim_set_features, + .ndo_bpf = nsim_bpf, + .ndo_udp_tunnel_add = udp_tunnel_nic_add_port, + .ndo_udp_tunnel_del = udp_tunnel_nic_del_port, + .ndo_get_devlink_port = nsim_get_devlink_port, +}; + +static void nsim_setup(struct net_device *dev) +{ + ether_setup(dev); + eth_hw_addr_random(dev); + + dev->tx_queue_len = 0; + dev->flags |= IFF_NOARP; + dev->flags &= ~IFF_MULTICAST; + dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | + IFF_NO_QUEUE; + dev->features |= NETIF_F_HIGHDMA | + NETIF_F_SG | + NETIF_F_FRAGLIST | + NETIF_F_HW_CSUM | + NETIF_F_TSO; + dev->hw_features |= NETIF_F_HW_TC; + dev->max_mtu = ETH_MAX_MTU; +} + +struct netdevsim * +nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port) +{ + struct net_device *dev; + struct netdevsim *ns; + int err; + + dev = alloc_netdev(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup); + if (!dev) + return ERR_PTR(-ENOMEM); + + dev_net_set(dev, nsim_dev_net(nsim_dev)); + ns = netdev_priv(dev); + ns->netdev = dev; + u64_stats_init(&ns->syncp); + ns->nsim_dev = nsim_dev; + ns->nsim_dev_port = nsim_dev_port; + ns->nsim_bus_dev = nsim_dev->nsim_bus_dev; + SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev); + dev->netdev_ops = &nsim_netdev_ops; + nsim_ethtool_init(ns); + + err = nsim_udp_tunnels_info_create(nsim_dev, dev); + if (err) + goto err_free_netdev; + + rtnl_lock(); + err = nsim_bpf_init(ns); + if (err) + goto err_utn_destroy; + + nsim_ipsec_init(ns); + + err = register_netdevice(dev); + if (err) + goto err_ipsec_teardown; + rtnl_unlock(); + + return ns; + +err_ipsec_teardown: + nsim_ipsec_teardown(ns); + nsim_bpf_uninit(ns); +err_utn_destroy: + rtnl_unlock(); + nsim_udp_tunnels_info_destroy(dev); +err_free_netdev: + free_netdev(dev); + return ERR_PTR(err); +} + +void nsim_destroy(struct netdevsim *ns) +{ + struct net_device *dev = ns->netdev; + + rtnl_lock(); + unregister_netdevice(dev); + nsim_ipsec_teardown(ns); + nsim_bpf_uninit(ns); + rtnl_unlock(); + nsim_udp_tunnels_info_destroy(dev); + free_netdev(dev); +} + +static int nsim_validate(struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + NL_SET_ERR_MSG_MOD(extack, "Please use: echo \"[ID] [PORT_COUNT]\" > /sys/bus/netdevsim/new_device"); + return -EOPNOTSUPP; +} + +static struct rtnl_link_ops nsim_link_ops __read_mostly = { + .kind = DRV_NAME, + .validate = nsim_validate, +}; + +static int __init nsim_module_init(void) +{ + int err; + + err = nsim_dev_init(); + if (err) + return err; + + err = nsim_bus_init(); + if (err) + goto err_dev_exit; + + err = rtnl_link_register(&nsim_link_ops); + if (err) + goto err_bus_exit; + + return 0; + +err_bus_exit: + nsim_bus_exit(); +err_dev_exit: + nsim_dev_exit(); + return err; +} + +static void __exit nsim_module_exit(void) +{ + rtnl_link_unregister(&nsim_link_ops); + nsim_bus_exit(); + nsim_dev_exit(); +} + +module_init(nsim_module_init); +module_exit(nsim_module_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_RTNL_LINK(DRV_NAME); diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h new file mode 100644 index 000000000..c4e7ad2a1 --- /dev/null +++ b/drivers/net/netdevsim/netdevsim.h @@ -0,0 +1,293 @@ +/* + * Copyright (C) 2017 Netronome Systems, Inc. + * + * 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/debugfs.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/netdevice.h> +#include <linux/u64_stats_sync.h> +#include <net/devlink.h> +#include <net/udp_tunnel.h> +#include <net/xdp.h> + +#define DRV_NAME "netdevsim" + +#define NSIM_XDP_MAX_MTU 4000 + +#define NSIM_EA(extack, msg) NL_SET_ERR_MSG_MOD((extack), msg) + +#define NSIM_IPSEC_MAX_SA_COUNT 33 +#define NSIM_IPSEC_VALID BIT(31) +#define NSIM_UDP_TUNNEL_N_PORTS 4 + +struct nsim_sa { + struct xfrm_state *xs; + __be32 ipaddr[4]; + u32 key[4]; + u32 salt; + bool used; + bool crypt; + bool rx; +}; + +struct nsim_ipsec { + struct nsim_sa sa[NSIM_IPSEC_MAX_SA_COUNT]; + struct dentry *pfile; + u32 count; + u32 tx; + u32 ok; +}; + +struct nsim_ethtool { + bool rx; + bool tx; + bool report_stats_rx; + bool report_stats_tx; +}; + +struct netdevsim { + struct net_device *netdev; + struct nsim_dev *nsim_dev; + struct nsim_dev_port *nsim_dev_port; + + u64 tx_packets; + u64 tx_bytes; + struct u64_stats_sync syncp; + + struct nsim_bus_dev *nsim_bus_dev; + + struct bpf_prog *bpf_offloaded; + u32 bpf_offloaded_id; + + struct xdp_attachment_info xdp; + struct xdp_attachment_info xdp_hw; + + bool bpf_tc_accept; + bool bpf_tc_non_bound_accept; + bool bpf_xdpdrv_accept; + bool bpf_xdpoffload_accept; + + bool bpf_map_accept; + struct nsim_ipsec ipsec; + struct { + u32 inject_error; + u32 sleep; + u32 __ports[2][NSIM_UDP_TUNNEL_N_PORTS]; + u32 (*ports)[NSIM_UDP_TUNNEL_N_PORTS]; + struct debugfs_u32_array dfs_ports[2]; + } udp_ports; + + struct nsim_ethtool ethtool; +}; + +struct netdevsim * +nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port); +void nsim_destroy(struct netdevsim *ns); + +void nsim_ethtool_init(struct netdevsim *ns); + +void nsim_udp_tunnels_debugfs_create(struct nsim_dev *nsim_dev); +int nsim_udp_tunnels_info_create(struct nsim_dev *nsim_dev, + struct net_device *dev); +void nsim_udp_tunnels_info_destroy(struct net_device *dev); + +#ifdef CONFIG_BPF_SYSCALL +int nsim_bpf_dev_init(struct nsim_dev *nsim_dev); +void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev); +int nsim_bpf_init(struct netdevsim *ns); +void nsim_bpf_uninit(struct netdevsim *ns); +int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf); +int nsim_bpf_disable_tc(struct netdevsim *ns); +int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, + void *type_data, void *cb_priv); +#else + +static inline int nsim_bpf_dev_init(struct nsim_dev *nsim_dev) +{ + return 0; +} + +static inline void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev) +{ +} +static inline int nsim_bpf_init(struct netdevsim *ns) +{ + return 0; +} + +static inline void nsim_bpf_uninit(struct netdevsim *ns) +{ +} + +static inline int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf) +{ + return -EOPNOTSUPP; +} + +static inline int nsim_bpf_disable_tc(struct netdevsim *ns) +{ + return 0; +} + +static inline int +nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data, + void *cb_priv) +{ + return -EOPNOTSUPP; +} +#endif + +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, +}; + +struct nsim_dev_health { + struct devlink_health_reporter *empty_reporter; + struct devlink_health_reporter *dummy_reporter; + struct dentry *ddir; + char *recovered_break_msg; + u32 binary_len; + bool fail_recover; +}; + +int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink); +void nsim_dev_health_exit(struct nsim_dev *nsim_dev); + +struct nsim_dev_port { + struct list_head list; + struct devlink_port devlink_port; + unsigned int port_index; + struct dentry *ddir; + struct netdevsim *ns; +}; + +struct nsim_dev { + struct nsim_bus_dev *nsim_bus_dev; + struct nsim_fib_data *fib_data; + struct nsim_trap_data *trap_data; + struct dentry *ddir; + struct dentry *ports_ddir; + struct dentry *take_snapshot; + struct bpf_offload_dev *bpf_dev; + bool bpf_bind_accept; + bool bpf_bind_verifier_accept; + u32 bpf_bind_verifier_delay; + struct dentry *ddir_bpf_bound_progs; + u32 prog_id_gen; + struct list_head bpf_bound_progs; + struct list_head bpf_bound_maps; + struct netdev_phys_item_id switch_id; + struct list_head port_list; + struct mutex port_list_lock; /* protects port list */ + bool fw_update_status; + u32 fw_update_overwrite_mask; + u32 max_macs; + bool test1; + bool dont_allow_reload; + bool fail_reload; + struct devlink_region *dummy_region; + struct nsim_dev_health health; + struct flow_action_cookie *fa_cookie; + spinlock_t fa_cookie_lock; /* protects fa_cookie */ + bool fail_trap_group_set; + bool fail_trap_policer_set; + bool fail_trap_policer_counter_get; + struct { + struct udp_tunnel_nic_shared utn_shared; + u32 __ports[2][NSIM_UDP_TUNNEL_N_PORTS]; + bool sync_all; + bool open_only; + bool ipv4_only; + bool shared; + bool static_iana_vxlan; + u32 sleep; + } udp_ports; +}; + +static inline struct net *nsim_dev_net(struct nsim_dev *nsim_dev) +{ + return devlink_net(priv_to_devlink(nsim_dev)); +} + +int nsim_dev_init(void); +void nsim_dev_exit(void); +int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev); +void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev); +int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev, + unsigned int port_index); +int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev, + unsigned int port_index); + +struct nsim_fib_data *nsim_fib_create(struct devlink *devlink, + struct netlink_ext_ack *extack); +void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *fib_data); +u64 nsim_fib_get_val(struct nsim_fib_data *fib_data, + enum nsim_resource_id res_id, bool max); + +#if IS_ENABLED(CONFIG_XFRM_OFFLOAD) +void nsim_ipsec_init(struct netdevsim *ns); +void nsim_ipsec_teardown(struct netdevsim *ns); +bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb); +#else +static inline void nsim_ipsec_init(struct netdevsim *ns) +{ +} + +static inline void nsim_ipsec_teardown(struct netdevsim *ns) +{ +} + +static inline bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb) +{ + return true; +} +#endif + +struct nsim_vf_config { + int link_state; + u16 min_tx_rate; + u16 max_tx_rate; + u16 vlan; + __be16 vlan_proto; + u16 qos; + u8 vf_mac[ETH_ALEN]; + bool spoofchk_enabled; + bool trusted; + bool rss_query_enabled; +}; + +struct nsim_bus_dev { + struct device dev; + struct list_head list; + unsigned int port_count; + struct net *initial_net; /* Purpose of this is to carry net pointer + * during the probe time only. + */ + unsigned int num_vfs; + struct nsim_vf_config *vfconfigs; + /* Lock for devlink->reload_enabled in netdevsim module */ + struct mutex nsim_bus_reload_lock; + bool init; +}; + +int nsim_bus_init(void); +void nsim_bus_exit(void); diff --git a/drivers/net/netdevsim/udp_tunnels.c b/drivers/net/netdevsim/udp_tunnels.c new file mode 100644 index 000000000..02dc3123e --- /dev/null +++ b/drivers/net/netdevsim/udp_tunnels.c @@ -0,0 +1,217 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (c) 2020 Facebook Inc. + +#include <linux/debugfs.h> +#include <linux/netdevice.h> +#include <linux/slab.h> +#include <net/udp_tunnel.h> + +#include "netdevsim.h" + +static int +nsim_udp_tunnel_set_port(struct net_device *dev, unsigned int table, + unsigned int entry, struct udp_tunnel_info *ti) +{ + struct netdevsim *ns = netdev_priv(dev); + int ret; + + ret = -ns->udp_ports.inject_error; + ns->udp_ports.inject_error = 0; + + if (ns->udp_ports.sleep) + msleep(ns->udp_ports.sleep); + + if (!ret) { + if (ns->udp_ports.ports[table][entry]) { + WARN(1, "entry already in use\n"); + ret = -EBUSY; + } else { + ns->udp_ports.ports[table][entry] = + be16_to_cpu(ti->port) << 16 | ti->type; + } + } + + netdev_info(dev, "set [%d, %d] type %d family %d port %d - %d\n", + table, entry, ti->type, ti->sa_family, ntohs(ti->port), + ret); + return ret; +} + +static int +nsim_udp_tunnel_unset_port(struct net_device *dev, unsigned int table, + unsigned int entry, struct udp_tunnel_info *ti) +{ + struct netdevsim *ns = netdev_priv(dev); + int ret; + + ret = -ns->udp_ports.inject_error; + ns->udp_ports.inject_error = 0; + + if (ns->udp_ports.sleep) + msleep(ns->udp_ports.sleep); + if (!ret) { + u32 val = be16_to_cpu(ti->port) << 16 | ti->type; + + if (val == ns->udp_ports.ports[table][entry]) { + ns->udp_ports.ports[table][entry] = 0; + } else { + WARN(1, "entry not installed %x vs %x\n", + val, ns->udp_ports.ports[table][entry]); + ret = -ENOENT; + } + } + + netdev_info(dev, "unset [%d, %d] type %d family %d port %d - %d\n", + table, entry, ti->type, ti->sa_family, ntohs(ti->port), + ret); + return ret; +} + +static int +nsim_udp_tunnel_sync_table(struct net_device *dev, unsigned int table) +{ + struct netdevsim *ns = netdev_priv(dev); + struct udp_tunnel_info ti; + unsigned int i; + int ret; + + ret = -ns->udp_ports.inject_error; + ns->udp_ports.inject_error = 0; + + for (i = 0; i < NSIM_UDP_TUNNEL_N_PORTS; i++) { + udp_tunnel_nic_get_port(dev, table, i, &ti); + ns->udp_ports.ports[table][i] = + be16_to_cpu(ti.port) << 16 | ti.type; + } + + return ret; +} + +static const struct udp_tunnel_nic_info nsim_udp_tunnel_info = { + .set_port = nsim_udp_tunnel_set_port, + .unset_port = nsim_udp_tunnel_unset_port, + .sync_table = nsim_udp_tunnel_sync_table, + + .tables = { + { + .n_entries = NSIM_UDP_TUNNEL_N_PORTS, + .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, + }, + { + .n_entries = NSIM_UDP_TUNNEL_N_PORTS, + .tunnel_types = UDP_TUNNEL_TYPE_GENEVE | + UDP_TUNNEL_TYPE_VXLAN_GPE, + }, + }, +}; + +static ssize_t +nsim_udp_tunnels_info_reset_write(struct file *file, const char __user *data, + size_t count, loff_t *ppos) +{ + struct net_device *dev = file->private_data; + struct netdevsim *ns = netdev_priv(dev); + + memset(ns->udp_ports.ports, 0, sizeof(ns->udp_ports.__ports)); + rtnl_lock(); + udp_tunnel_nic_reset_ntf(dev); + rtnl_unlock(); + + return count; +} + +static const struct file_operations nsim_udp_tunnels_info_reset_fops = { + .open = simple_open, + .write = nsim_udp_tunnels_info_reset_write, + .llseek = generic_file_llseek, + .owner = THIS_MODULE, +}; + +int nsim_udp_tunnels_info_create(struct nsim_dev *nsim_dev, + struct net_device *dev) +{ + struct netdevsim *ns = netdev_priv(dev); + struct udp_tunnel_nic_info *info; + + if (nsim_dev->udp_ports.shared && nsim_dev->udp_ports.open_only) { + dev_err(&nsim_dev->nsim_bus_dev->dev, + "shared can't be used in conjunction with open_only\n"); + return -EINVAL; + } + + if (!nsim_dev->udp_ports.shared) + ns->udp_ports.ports = ns->udp_ports.__ports; + else + ns->udp_ports.ports = nsim_dev->udp_ports.__ports; + + debugfs_create_u32("udp_ports_inject_error", 0600, + ns->nsim_dev_port->ddir, + &ns->udp_ports.inject_error); + + ns->udp_ports.dfs_ports[0].array = ns->udp_ports.ports[0]; + ns->udp_ports.dfs_ports[0].n_elements = NSIM_UDP_TUNNEL_N_PORTS; + debugfs_create_u32_array("udp_ports_table0", 0400, + ns->nsim_dev_port->ddir, + &ns->udp_ports.dfs_ports[0]); + + ns->udp_ports.dfs_ports[1].array = ns->udp_ports.ports[1]; + ns->udp_ports.dfs_ports[1].n_elements = NSIM_UDP_TUNNEL_N_PORTS; + debugfs_create_u32_array("udp_ports_table1", 0400, + ns->nsim_dev_port->ddir, + &ns->udp_ports.dfs_ports[1]); + + debugfs_create_file("udp_ports_reset", 0200, ns->nsim_dev_port->ddir, + dev, &nsim_udp_tunnels_info_reset_fops); + + /* Note: it's not normal to allocate the info struct like this! + * Drivers are expected to use a static const one, here we're testing. + */ + info = kmemdup(&nsim_udp_tunnel_info, sizeof(nsim_udp_tunnel_info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + ns->udp_ports.sleep = nsim_dev->udp_ports.sleep; + + if (nsim_dev->udp_ports.sync_all) { + info->set_port = NULL; + info->unset_port = NULL; + } else { + info->sync_table = NULL; + } + + if (ns->udp_ports.sleep) + info->flags |= UDP_TUNNEL_NIC_INFO_MAY_SLEEP; + if (nsim_dev->udp_ports.open_only) + info->flags |= UDP_TUNNEL_NIC_INFO_OPEN_ONLY; + if (nsim_dev->udp_ports.ipv4_only) + info->flags |= UDP_TUNNEL_NIC_INFO_IPV4_ONLY; + if (nsim_dev->udp_ports.shared) + info->shared = &nsim_dev->udp_ports.utn_shared; + if (nsim_dev->udp_ports.static_iana_vxlan) + info->flags |= UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN; + + dev->udp_tunnel_nic_info = info; + return 0; +} + +void nsim_udp_tunnels_info_destroy(struct net_device *dev) +{ + kfree(dev->udp_tunnel_nic_info); + dev->udp_tunnel_nic_info = NULL; +} + +void nsim_udp_tunnels_debugfs_create(struct nsim_dev *nsim_dev) +{ + debugfs_create_bool("udp_ports_sync_all", 0600, nsim_dev->ddir, + &nsim_dev->udp_ports.sync_all); + debugfs_create_bool("udp_ports_open_only", 0600, nsim_dev->ddir, + &nsim_dev->udp_ports.open_only); + debugfs_create_bool("udp_ports_ipv4_only", 0600, nsim_dev->ddir, + &nsim_dev->udp_ports.ipv4_only); + debugfs_create_bool("udp_ports_shared", 0600, nsim_dev->ddir, + &nsim_dev->udp_ports.shared); + debugfs_create_bool("udp_ports_static_iana_vxlan", 0600, nsim_dev->ddir, + &nsim_dev->udp_ports.static_iana_vxlan); + debugfs_create_u32("udp_ports_sleep", 0600, nsim_dev->ddir, + &nsim_dev->udp_ports.sleep); +} |