1/*
  2 * Copyright (C) 2017 Netronome Systems, Inc.
  3 *
  4 * This software is licensed under the GNU General License Version 2,
  5 * June 1991 as shown in the file COPYING in the top-level directory of this
  6 * source tree.
  7 *
  8 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
  9 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 10 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 11 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
 12 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 13 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 14 */
 15
 16#include <linux/debugfs.h>
 17#include <linux/device.h>
 18#include <linux/ethtool.h>
 19#include <linux/kernel.h>
 20#include <linux/list.h>
 21#include <linux/netdevice.h>
 22#include <linux/u64_stats_sync.h>
 23#include <net/devlink.h>
 24#include <net/udp_tunnel.h>
 25#include <net/xdp.h>
 26
 27#define DRV_NAME	"netdevsim"
 28
 29#define NSIM_XDP_MAX_MTU	4000
 30
 31#define NSIM_EA(extack, msg)	NL_SET_ERR_MSG_MOD((extack), msg)
 32
 33#define NSIM_IPSEC_MAX_SA_COUNT		33
 34#define NSIM_IPSEC_VALID		BIT(31)
 35#define NSIM_UDP_TUNNEL_N_PORTS		4
 36
 37struct nsim_sa {
 38	struct xfrm_state *xs;
 39	__be32 ipaddr[4];
 40	u32 key[4];
 41	u32 salt;
 42	bool used;
 43	bool crypt;
 44	bool rx;
 45};
 46
 47struct nsim_ipsec {
 48	struct nsim_sa sa[NSIM_IPSEC_MAX_SA_COUNT];
 49	struct dentry *pfile;
 50	u32 count;
 51	u32 tx;
 52	u32 ok;
 53};
 54
 55struct nsim_ethtool_pauseparam {
 56	bool rx;
 57	bool tx;
 58	bool report_stats_rx;
 59	bool report_stats_tx;
 60};
 61
 62struct nsim_ethtool {
 63	u32 get_err;
 64	u32 set_err;
 65	struct nsim_ethtool_pauseparam pauseparam;
 66	struct ethtool_coalesce coalesce;
 67	struct ethtool_ringparam ring;
 68	struct ethtool_fecparam fec;
 69};
 70
 71struct netdevsim {
 72	struct net_device *netdev;
 73	struct nsim_dev *nsim_dev;
 74	struct nsim_dev_port *nsim_dev_port;
 75
 76	u64 tx_packets;
 77	u64 tx_bytes;
 78	struct u64_stats_sync syncp;
 79
 80	struct nsim_bus_dev *nsim_bus_dev;
 81
 82	struct bpf_prog	*bpf_offloaded;
 83	u32 bpf_offloaded_id;
 84
 85	struct xdp_attachment_info xdp;
 86	struct xdp_attachment_info xdp_hw;
 87
 88	bool bpf_tc_accept;
 89	bool bpf_tc_non_bound_accept;
 90	bool bpf_xdpdrv_accept;
 91	bool bpf_xdpoffload_accept;
 92
 93	bool bpf_map_accept;
 94	struct nsim_ipsec ipsec;
 95	struct {
 96		u32 inject_error;
 97		u32 sleep;
 98		u32 __ports[2][NSIM_UDP_TUNNEL_N_PORTS];
 99		u32 (*ports)[NSIM_UDP_TUNNEL_N_PORTS];
100		struct debugfs_u32_array dfs_ports[2];
101	} udp_ports;
102
103	struct nsim_ethtool ethtool;
104};
105
106struct netdevsim *
107nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port);
108void nsim_destroy(struct netdevsim *ns);
109
110void nsim_ethtool_init(struct netdevsim *ns);
111
112void nsim_udp_tunnels_debugfs_create(struct nsim_dev *nsim_dev);
113int nsim_udp_tunnels_info_create(struct nsim_dev *nsim_dev,
114				 struct net_device *dev);
115void nsim_udp_tunnels_info_destroy(struct net_device *dev);
116
117#ifdef CONFIG_BPF_SYSCALL
118int nsim_bpf_dev_init(struct nsim_dev *nsim_dev);
119void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev);
120int nsim_bpf_init(struct netdevsim *ns);
121void nsim_bpf_uninit(struct netdevsim *ns);
122int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
123int nsim_bpf_disable_tc(struct netdevsim *ns);
124int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
125			       void *type_data, void *cb_priv);
126#else
127
128static inline int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
129{
130	return 0;
131}
132
133static inline void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
134{
135}
136static inline int nsim_bpf_init(struct netdevsim *ns)
137{
138	return 0;
139}
140
141static inline void nsim_bpf_uninit(struct netdevsim *ns)
142{
143}
144
145static inline int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
146{
147	return -EOPNOTSUPP;
148}
149
150static inline int nsim_bpf_disable_tc(struct netdevsim *ns)
151{
152	return 0;
153}
154
155static inline int
156nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
157			   void *cb_priv)
158{
159	return -EOPNOTSUPP;
160}
161#endif
162
163enum nsim_resource_id {
164	NSIM_RESOURCE_NONE,   /* DEVLINK_RESOURCE_ID_PARENT_TOP */
165	NSIM_RESOURCE_IPV4,
166	NSIM_RESOURCE_IPV4_FIB,
167	NSIM_RESOURCE_IPV4_FIB_RULES,
168	NSIM_RESOURCE_IPV6,
169	NSIM_RESOURCE_IPV6_FIB,
170	NSIM_RESOURCE_IPV6_FIB_RULES,
171	NSIM_RESOURCE_NEXTHOPS,
172};
173
174struct nsim_dev_health {
175	struct devlink_health_reporter *empty_reporter;
176	struct devlink_health_reporter *dummy_reporter;
177	struct dentry *ddir;
178	char *recovered_break_msg;
179	u32 binary_len;
180	bool fail_recover;
181};
182
183int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink);
184void nsim_dev_health_exit(struct nsim_dev *nsim_dev);
185
186#if IS_ENABLED(CONFIG_PSAMPLE)
187int nsim_dev_psample_init(struct nsim_dev *nsim_dev);
188void nsim_dev_psample_exit(struct nsim_dev *nsim_dev);
189#else
190static inline int nsim_dev_psample_init(struct nsim_dev *nsim_dev)
191{
192	return 0;
193}
194
195static inline void nsim_dev_psample_exit(struct nsim_dev *nsim_dev)
196{
197}
198#endif
199
200enum nsim_dev_port_type {
201	NSIM_DEV_PORT_TYPE_PF,
202	NSIM_DEV_PORT_TYPE_VF,
203};
204
205#define NSIM_DEV_VF_PORT_INDEX_BASE 128
206#define NSIM_DEV_VF_PORT_INDEX_MAX UINT_MAX
207
208struct nsim_dev_port {
209	struct list_head list;
210	struct devlink_port devlink_port;
211	unsigned int port_index;
212	enum nsim_dev_port_type port_type;
213	struct dentry *ddir;
214	struct dentry *rate_parent;
215	char *parent_name;
216	struct netdevsim *ns;
217};
218
219struct nsim_dev {
220	struct nsim_bus_dev *nsim_bus_dev;
221	struct nsim_fib_data *fib_data;
222	struct nsim_trap_data *trap_data;
223	struct dentry *ddir;
224	struct dentry *ports_ddir;
225	struct dentry *take_snapshot;
226	struct dentry *max_vfs;
227	struct dentry *nodes_ddir;
228	struct bpf_offload_dev *bpf_dev;
229	bool bpf_bind_accept;
230	bool bpf_bind_verifier_accept;
231	u32 bpf_bind_verifier_delay;
232	struct dentry *ddir_bpf_bound_progs;
233	u32 prog_id_gen;
234	struct list_head bpf_bound_progs;
235	struct list_head bpf_bound_maps;
236	struct netdev_phys_item_id switch_id;
237	struct list_head port_list;
238	struct mutex port_list_lock; /* protects port list */
239	bool fw_update_status;
240	u32 fw_update_overwrite_mask;
241	u32 max_macs;
242	bool test1;
243	bool dont_allow_reload;
244	bool fail_reload;
245	struct devlink_region *dummy_region;
246	struct nsim_dev_health health;
247	struct flow_action_cookie *fa_cookie;
248	spinlock_t fa_cookie_lock; /* protects fa_cookie */
249	bool fail_trap_group_set;
250	bool fail_trap_policer_set;
251	bool fail_trap_policer_counter_get;
252	bool fail_trap_drop_counter_get;
253	struct {
254		struct udp_tunnel_nic_shared utn_shared;
255		u32 __ports[2][NSIM_UDP_TUNNEL_N_PORTS];
256		bool sync_all;
257		bool open_only;
258		bool ipv4_only;
259		bool shared;
260		bool static_iana_vxlan;
261		u32 sleep;
262	} udp_ports;
263	struct nsim_dev_psample *psample;
264	u16 esw_mode;
265};
266
267int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev, struct netlink_ext_ack *extack);
268int nsim_esw_switchdev_enable(struct nsim_dev *nsim_dev, struct netlink_ext_ack *extack);
269
270static inline bool nsim_esw_mode_is_legacy(struct nsim_dev *nsim_dev)
271{
272	return nsim_dev->esw_mode == DEVLINK_ESWITCH_MODE_LEGACY;
273}
274
275static inline bool nsim_esw_mode_is_switchdev(struct nsim_dev *nsim_dev)
276{
277	return nsim_dev->esw_mode == DEVLINK_ESWITCH_MODE_SWITCHDEV;
278}
279
280static inline struct net *nsim_dev_net(struct nsim_dev *nsim_dev)
281{
282	return devlink_net(priv_to_devlink(nsim_dev));
283}
284
285int nsim_dev_init(void);
286void nsim_dev_exit(void);
287int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev);
288void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev);
289int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
290		      enum nsim_dev_port_type type,
291		      unsigned int port_index);
292int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
293		      enum nsim_dev_port_type type,
294		      unsigned int port_index);
295
296struct nsim_fib_data *nsim_fib_create(struct devlink *devlink,
297				      struct netlink_ext_ack *extack);
298void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *fib_data);
299u64 nsim_fib_get_val(struct nsim_fib_data *fib_data,
300		     enum nsim_resource_id res_id, bool max);
301
302ssize_t nsim_bus_dev_max_vfs_read(struct file *file,
303				  char __user *data,
304				  size_t count, loff_t *ppos);
305ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
306				   const char __user *data,
307				   size_t count, loff_t *ppos);
308void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev);
309
310static inline bool nsim_dev_port_is_pf(struct nsim_dev_port *nsim_dev_port)
311{
312	return nsim_dev_port->port_type == NSIM_DEV_PORT_TYPE_PF;
313}
314
315static inline bool nsim_dev_port_is_vf(struct nsim_dev_port *nsim_dev_port)
316{
317	return nsim_dev_port->port_type == NSIM_DEV_PORT_TYPE_VF;
318}
319#if IS_ENABLED(CONFIG_XFRM_OFFLOAD)
320void nsim_ipsec_init(struct netdevsim *ns);
321void nsim_ipsec_teardown(struct netdevsim *ns);
322bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb);
323#else
324static inline void nsim_ipsec_init(struct netdevsim *ns)
325{
326}
327
328static inline void nsim_ipsec_teardown(struct netdevsim *ns)
329{
330}
331
332static inline bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb)
333{
334	return true;
335}
336#endif
337
338struct nsim_vf_config {
339	int link_state;
340	u16 min_tx_rate;
341	u16 max_tx_rate;
342	u16 vlan;
343	__be16 vlan_proto;
344	u16 qos;
345	u8 vf_mac[ETH_ALEN];
346	bool spoofchk_enabled;
347	bool trusted;
348	bool rss_query_enabled;
349};
350
351struct nsim_bus_dev {
352	struct device dev;
353	struct list_head list;
354	unsigned int port_count;
355	struct net *initial_net; /* Purpose of this is to carry net pointer
356				  * during the probe time only.
357				  */
358	unsigned int max_vfs;
359	unsigned int num_vfs;
360	struct mutex vfs_lock;  /* Protects vfconfigs */
361	struct nsim_vf_config *vfconfigs;
362	/* Lock for devlink->reload_enabled in netdevsim module */
363	struct mutex nsim_bus_reload_lock;
364	bool init;
365};
366
367int nsim_bus_init(void);
368void nsim_bus_exit(void);