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dev.c
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dev.c
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/*
* 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"
#define NSIM_DEV_LINECARD_PORT_INDEX_BASE 1024
#define NSIM_DEV_LINECARD_PORT_INDEX_STEP 256
static unsigned int
nsim_dev_port_index(enum nsim_dev_port_type type,
struct nsim_dev_linecard *nsim_dev_linecard,
unsigned int port_index)
{
switch (type) {
case NSIM_DEV_PORT_TYPE_VF:
port_index = NSIM_DEV_VF_PORT_INDEX_BASE + port_index;
break;
case NSIM_DEV_PORT_TYPE_PF:
if (nsim_dev_linecard)
port_index += NSIM_DEV_LINECARD_PORT_INDEX_BASE +
nsim_dev_linecard->linecard_index *
NSIM_DEV_LINECARD_PORT_INDEX_STEP;
break;
}
return port_index;
}
static inline unsigned int nsim_dev_port_index_to_vf_index(unsigned int port_index)
{
return port_index - NSIM_DEV_VF_PORT_INDEX_BASE;
}
static struct dentry *nsim_dev_ddir;
unsigned int nsim_dev_get_vfs(struct nsim_dev *nsim_dev)
{
WARN_ON(!lockdep_rtnl_is_held() &&
!devl_lock_is_held(priv_to_devlink(nsim_dev)));
return nsim_dev->nsim_bus_dev->num_vfs;
}
static void
nsim_bus_dev_set_vfs(struct nsim_bus_dev *nsim_bus_dev, unsigned int num_vfs)
{
rtnl_lock();
nsim_bus_dev->num_vfs = num_vfs;
rtnl_unlock();
}
#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 = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
if (!buf)
return -ENOMEM;
ret = simple_write_to_buffer(buf, count, ppos, data, count);
if (ret < 0)
goto free_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 ssize_t nsim_bus_dev_max_vfs_read(struct file *file, char __user *data,
size_t count, loff_t *ppos)
{
struct nsim_dev *nsim_dev = file->private_data;
char buf[11];
ssize_t len;
len = scnprintf(buf, sizeof(buf), "%u\n",
READ_ONCE(nsim_dev->nsim_bus_dev->max_vfs));
return simple_read_from_buffer(data, count, ppos, buf, len);
}
static ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
const char __user *data,
size_t count, loff_t *ppos)
{
struct nsim_vf_config *vfconfigs;
struct nsim_dev *nsim_dev;
char buf[10];
ssize_t ret;
u32 val;
if (*ppos != 0)
return 0;
if (count >= sizeof(buf))
return -ENOSPC;
ret = copy_from_user(buf, data, count);
if (ret)
return -EFAULT;
buf[count] = '\0';
ret = kstrtouint(buf, 10, &val);
if (ret)
return -EINVAL;
/* max_vfs limited by the maximum number of provided port indexes */
if (val > NSIM_DEV_VF_PORT_INDEX_MAX - NSIM_DEV_VF_PORT_INDEX_BASE)
return -ERANGE;
vfconfigs = kcalloc(val, sizeof(struct nsim_vf_config),
GFP_KERNEL | __GFP_NOWARN);
if (!vfconfigs)
return -ENOMEM;
nsim_dev = file->private_data;
devl_lock(priv_to_devlink(nsim_dev));
/* Reject if VFs are configured */
if (nsim_dev_get_vfs(nsim_dev)) {
ret = -EBUSY;
} else {
swap(nsim_dev->vfconfigs, vfconfigs);
WRITE_ONCE(nsim_dev->nsim_bus_dev->max_vfs, val);
*ppos += count;
ret = count;
}
devl_unlock(priv_to_devlink(nsim_dev));
kfree(vfconfigs);
return ret;
}
static const struct file_operations nsim_dev_max_vfs_fops = {
.open = simple_open,
.read = nsim_bus_dev_max_vfs_read,
.write = nsim_bus_dev_max_vfs_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];
int err;
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);
nsim_dev->linecards_ddir = debugfs_create_dir("linecards",
nsim_dev->ddir);
if (IS_ERR(nsim_dev->linecards_ddir))
return PTR_ERR(nsim_dev->linecards_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);
/* caution, dev_max_vfs write takes devlink lock */
debugfs_create_file("max_vfs", 0600, nsim_dev->ddir,
nsim_dev, &nsim_dev_max_vfs_fops);
nsim_dev->nodes_ddir = debugfs_create_dir("rate_nodes", nsim_dev->ddir);
if (IS_ERR(nsim_dev->nodes_ddir)) {
err = PTR_ERR(nsim_dev->nodes_ddir);
goto err_out;
}
debugfs_create_bool("fail_trap_drop_counter_get", 0600,
nsim_dev->ddir,
&nsim_dev->fail_trap_drop_counter_get);
nsim_udp_tunnels_debugfs_create(nsim_dev);
return 0;
err_out:
debugfs_remove_recursive(nsim_dev->ports_ddir);
debugfs_remove_recursive(nsim_dev->ddir);
return err;
}
static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
{
debugfs_remove_recursive(nsim_dev->nodes_ddir);
debugfs_remove_recursive(nsim_dev->linecards_ddir);
debugfs_remove_recursive(nsim_dev->ports_ddir);
debugfs_remove_recursive(nsim_dev->ddir);
}
static ssize_t nsim_dev_rate_parent_read(struct file *file,
char __user *data,
size_t count, loff_t *ppos)
{
char **name_ptr = file->private_data;
size_t len;
if (!*name_ptr)
return 0;
len = strlen(*name_ptr);
return simple_read_from_buffer(data, count, ppos, *name_ptr, len);
}
static const struct file_operations nsim_dev_rate_parent_fops = {
.open = simple_open,
.read = nsim_dev_rate_parent_read,
.llseek = generic_file_llseek,
.owner = THIS_MODULE,
};
static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
struct nsim_dev_port *nsim_dev_port)
{
struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev;
unsigned int port_index = nsim_dev_port->port_index;
char port_ddir_name[16];
char dev_link_name[32];
sprintf(port_ddir_name, "%u", 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_bus_dev->dev.id);
if (nsim_dev_port_is_vf(nsim_dev_port)) {
unsigned int vf_id = nsim_dev_port_index_to_vf_index(port_index);
debugfs_create_u16("tx_share", 0400, nsim_dev_port->ddir,
&nsim_dev->vfconfigs[vf_id].min_tx_rate);
debugfs_create_u16("tx_max", 0400, nsim_dev_port->ddir,
&nsim_dev->vfconfigs[vf_id].max_tx_rate);
nsim_dev_port->rate_parent = debugfs_create_file("rate_parent",
0400,
nsim_dev_port->ddir,
&nsim_dev_port->parent_name,
&nsim_dev_rate_parent_fops);
}
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_linecard_debugfs_init(struct nsim_dev *nsim_dev,
struct nsim_dev_linecard *nsim_dev_linecard)
{
char linecard_ddir_name[16];
char dev_link_name[32];
sprintf(linecard_ddir_name, "%u", nsim_dev_linecard->linecard_index);
nsim_dev_linecard->ddir = debugfs_create_dir(linecard_ddir_name,
nsim_dev->linecards_ddir);
if (IS_ERR(nsim_dev_linecard->ddir))
return PTR_ERR(nsim_dev_linecard->ddir);
sprintf(dev_link_name, "../../../" DRV_NAME "%u",
nsim_dev->nsim_bus_dev->dev.id);
debugfs_create_symlink("dev", nsim_dev_linecard->ddir, dev_link_name);
return 0;
}
static void
nsim_dev_linecard_debugfs_exit(struct nsim_dev_linecard *nsim_dev_linecard)
{
debugfs_remove_recursive(nsim_dev_linecard->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;
}
/* Resources for nexthops */
err = devlink_resource_register(devlink, "nexthops", (u64)-1,
NSIM_RESOURCE_NEXTHOPS,
DEVLINK_RESOURCE_ID_PARENT_TOP,
¶ms);
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);
}
static int
__nsim_dev_port_add(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
unsigned int port_index);
static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port);
static int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev,
struct netlink_ext_ack *extack)
{
struct devlink *devlink = priv_to_devlink(nsim_dev);
struct nsim_dev_port *nsim_dev_port, *tmp;
devl_rate_nodes_destroy(devlink);
list_for_each_entry_safe(nsim_dev_port, tmp, &nsim_dev->port_list, list)
if (nsim_dev_port_is_vf(nsim_dev_port))
__nsim_dev_port_del(nsim_dev_port);
nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
return 0;
}
static int nsim_esw_switchdev_enable(struct nsim_dev *nsim_dev,
struct netlink_ext_ack *extack)
{
struct nsim_dev_port *nsim_dev_port, *tmp;
int i, err;
for (i = 0; i < nsim_dev_get_vfs(nsim_dev); i++) {
err = __nsim_dev_port_add(nsim_dev, NSIM_DEV_PORT_TYPE_VF,
NULL, i);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed to initialize VFs' netdevsim ports");
pr_err("Failed to initialize VF id=%d. %d.\n", i, err);
goto err_port_add_vfs;
}
}
nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
return 0;
err_port_add_vfs:
list_for_each_entry_safe(nsim_dev_port, tmp, &nsim_dev->port_list, list)
if (nsim_dev_port_is_vf(nsim_dev_port))
__nsim_dev_port_del(nsim_dev_port, NULL, i);
return err;
}
static int nsim_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
struct netlink_ext_ack *extack)
{
struct nsim_dev *nsim_dev = devlink_priv(devlink);
if (mode == nsim_dev->esw_mode)
return 0;
if (mode == DEVLINK_ESWITCH_MODE_LEGACY)
return nsim_esw_legacy_enable(nsim_dev, extack);
if (mode == DEVLINK_ESWITCH_MODE_SWITCHDEV)
return nsim_esw_switchdev_enable(nsim_dev, extack);
return -EINVAL;
}
static int nsim_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)
{
struct nsim_dev *nsim_dev = devlink_priv(devlink);
*mode = nsim_dev->esw_mode;
return 0;
}
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;
u64 trap_pkt_cnt;
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.
*/
devl_lock(priv_to_devlink(nsim_dev));
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);
}
devl_unlock(priv_to_devlink(nsim_dev));
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);
/* caution, trap work takes devlink lock */
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);
struct nsim_bus_dev *nsim_bus_dev;
nsim_bus_dev = nsim_dev->nsim_bus_dev;
if (!mutex_trylock(&nsim_bus_dev->nsim_bus_reload_lock))
return -EOPNOTSUPP;
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");
mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
return -EOPNOTSUPP;
}