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/kernel.h>
 19#include <linux/list.h>
 20#include <linux/netdevice.h>
 21#include <linux/u64_stats_sync.h>
 22#include <net/devlink.h>
 23#include <net/xdp.h>
 24
 25#define DRV_NAME	"netdevsim"
 26
 27#define NSIM_XDP_MAX_MTU	4000
 28
 29#define NSIM_EA(extack, msg)	NL_SET_ERR_MSG_MOD((extack), msg)
 30
 31#define NSIM_IPSEC_MAX_SA_COUNT		33
 32#define NSIM_IPSEC_VALID		BIT(31)
 33#define NSIM_UDP_TUNNEL_N_PORTS		4
 34
 35struct nsim_sa {
 36	struct xfrm_state *xs;
 37	__be32 ipaddr[4];
 38	u32 key[4];
 39	u32 salt;
 40	bool used;
 41	bool crypt;
 42	bool rx;
 43};
 44
 45struct nsim_ipsec {
 46	struct nsim_sa sa[NSIM_IPSEC_MAX_SA_COUNT];
 47	struct dentry *pfile;
 48	u32 count;
 49	u32 tx;
 50	u32 ok;
 51};
 52
 53struct netdevsim {
 54	struct net_device *netdev;
 55	struct nsim_dev *nsim_dev;
 56	struct nsim_dev_port *nsim_dev_port;
 57
 58	u64 tx_packets;
 59	u64 tx_bytes;
 60	struct u64_stats_sync syncp;
 61
 62	struct nsim_bus_dev *nsim_bus_dev;
 63
 64	struct bpf_prog	*bpf_offloaded;
 65	u32 bpf_offloaded_id;
 66
 67	struct xdp_attachment_info xdp;
 68	struct xdp_attachment_info xdp_hw;
 69
 70	bool bpf_tc_accept;
 71	bool bpf_tc_non_bound_accept;
 72	bool bpf_xdpdrv_accept;
 73	bool bpf_xdpoffload_accept;
 74
 75	bool bpf_map_accept;
 76	struct nsim_ipsec ipsec;
 77	struct {
 78		u32 inject_error;
 79		u32 sleep;
 80		u32 ports[2][NSIM_UDP_TUNNEL_N_PORTS];
 81		struct debugfs_u32_array dfs_ports[2];
 82	} udp_ports;
 83};
 84
 85struct netdevsim *
 86nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port);
 87void nsim_destroy(struct netdevsim *ns);
 88
 89void nsim_udp_tunnels_debugfs_create(struct nsim_dev *nsim_dev);
 90int nsim_udp_tunnels_info_create(struct nsim_dev *nsim_dev,
 91				 struct net_device *dev);
 92void nsim_udp_tunnels_info_destroy(struct net_device *dev);
 93
 94#ifdef CONFIG_BPF_SYSCALL
 95int nsim_bpf_dev_init(struct nsim_dev *nsim_dev);
 96void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev);
 97int nsim_bpf_init(struct netdevsim *ns);
 98void nsim_bpf_uninit(struct netdevsim *ns);
 99int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
100int nsim_bpf_disable_tc(struct netdevsim *ns);
101int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
102			       void *type_data, void *cb_priv);
103#else
104
105static inline int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
106{
107	return 0;
108}
109
110static inline void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
111{
112}
113static inline int nsim_bpf_init(struct netdevsim *ns)
114{
115	return 0;
116}
117
118static inline void nsim_bpf_uninit(struct netdevsim *ns)
119{
120}
121
122static inline int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
123{
124	return -EOPNOTSUPP;
125}
126
127static inline int nsim_bpf_disable_tc(struct netdevsim *ns)
128{
129	return 0;
130}
131
132static inline int
133nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
134			   void *cb_priv)
135{
136	return -EOPNOTSUPP;
137}
138#endif
139
140enum nsim_resource_id {
141	NSIM_RESOURCE_NONE,   /* DEVLINK_RESOURCE_ID_PARENT_TOP */
142	NSIM_RESOURCE_IPV4,
143	NSIM_RESOURCE_IPV4_FIB,
144	NSIM_RESOURCE_IPV4_FIB_RULES,
145	NSIM_RESOURCE_IPV6,
146	NSIM_RESOURCE_IPV6_FIB,
147	NSIM_RESOURCE_IPV6_FIB_RULES,
148};
149
150struct nsim_dev_health {
151	struct devlink_health_reporter *empty_reporter;
152	struct devlink_health_reporter *dummy_reporter;
153	struct dentry *ddir;
154	char *recovered_break_msg;
155	u32 binary_len;
156	bool fail_recover;
157};
158
159int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink);
160void nsim_dev_health_exit(struct nsim_dev *nsim_dev);
161
162struct nsim_dev_port {
163	struct list_head list;
164	struct devlink_port devlink_port;
165	unsigned int port_index;
166	struct dentry *ddir;
167	struct netdevsim *ns;
168};
169
170struct nsim_dev {
171	struct nsim_bus_dev *nsim_bus_dev;
172	struct nsim_fib_data *fib_data;
173	struct nsim_trap_data *trap_data;
174	struct dentry *ddir;
175	struct dentry *ports_ddir;
176	struct dentry *take_snapshot;
177	struct bpf_offload_dev *bpf_dev;
178	bool bpf_bind_accept;
179	u32 bpf_bind_verifier_delay;
180	struct dentry *ddir_bpf_bound_progs;
181	u32 prog_id_gen;
182	struct list_head bpf_bound_progs;
183	struct list_head bpf_bound_maps;
184	struct netdev_phys_item_id switch_id;
185	struct list_head port_list;
186	struct mutex port_list_lock; /* protects port list */
187	bool fw_update_status;
188	u32 max_macs;
189	bool test1;
190	bool dont_allow_reload;
191	bool fail_reload;
192	struct devlink_region *dummy_region;
193	struct nsim_dev_health health;
194	struct flow_action_cookie *fa_cookie;
195	spinlock_t fa_cookie_lock; /* protects fa_cookie */
196	bool fail_trap_group_set;
197	bool fail_trap_policer_set;
198	bool fail_trap_policer_counter_get;
199	struct {
200		bool sync_all;
201		bool open_only;
202		bool ipv4_only;
203		u32 sleep;
204	} udp_ports;
205};
206
207static inline struct net *nsim_dev_net(struct nsim_dev *nsim_dev)
208{
209	return devlink_net(priv_to_devlink(nsim_dev));
210}
211
212int nsim_dev_init(void);
213void nsim_dev_exit(void);
214int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev);
215void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev);
216int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
217		      unsigned int port_index);
218int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
219		      unsigned int port_index);
220
221struct nsim_fib_data *nsim_fib_create(struct devlink *devlink,
222				      struct netlink_ext_ack *extack);
223void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *fib_data);
224u64 nsim_fib_get_val(struct nsim_fib_data *fib_data,
225		     enum nsim_resource_id res_id, bool max);
226
227#if IS_ENABLED(CONFIG_XFRM_OFFLOAD)
228void nsim_ipsec_init(struct netdevsim *ns);
229void nsim_ipsec_teardown(struct netdevsim *ns);
230bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb);
231#else
232static inline void nsim_ipsec_init(struct netdevsim *ns)
233{
234}
235
236static inline void nsim_ipsec_teardown(struct netdevsim *ns)
237{
238}
239
240static inline bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb)
241{
242	return true;
243}
244#endif
245
246struct nsim_vf_config {
247	int link_state;
248	u16 min_tx_rate;
249	u16 max_tx_rate;
250	u16 vlan;
251	__be16 vlan_proto;
252	u16 qos;
253	u8 vf_mac[ETH_ALEN];
254	bool spoofchk_enabled;
255	bool trusted;
256	bool rss_query_enabled;
257};
258
259struct nsim_bus_dev {
260	struct device dev;
261	struct list_head list;
262	unsigned int port_count;
263	struct net *initial_net; /* Purpose of this is to carry net pointer
264				  * during the probe time only.
265				  */
266	unsigned int num_vfs;
267	struct nsim_vf_config *vfconfigs;
268	/* Lock for devlink->reload_enabled in netdevsim module */
269	struct mutex nsim_bus_reload_lock;
270	bool init;
271};
272
273int nsim_bus_init(void);
274void nsim_bus_exit(void);