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/device.h>
17 #include <linux/kernel.h>
18 #include <linux/list.h>
19 #include <linux/netdevice.h>
20 #include <linux/u64_stats_sync.h>
21 #include <net/devlink.h>
22 #include <net/xdp.h>
23 
24 #define DRV_NAME	"netdevsim"
25 
26 #define NSIM_XDP_MAX_MTU	4000
27 
28 #define NSIM_EA(extack, msg)	NL_SET_ERR_MSG_MOD((extack), msg)
29 
30 #define NSIM_IPSEC_MAX_SA_COUNT		33
31 #define NSIM_IPSEC_VALID		BIT(31)
32 
33 struct nsim_sa {
34 	struct xfrm_state *xs;
35 	__be32 ipaddr[4];
36 	u32 key[4];
37 	u32 salt;
38 	bool used;
39 	bool crypt;
40 	bool rx;
41 };
42 
43 struct nsim_ipsec {
44 	struct nsim_sa sa[NSIM_IPSEC_MAX_SA_COUNT];
45 	struct dentry *pfile;
46 	u32 count;
47 	u32 tx;
48 	u32 ok;
49 };
50 
51 struct netdevsim {
52 	struct net_device *netdev;
53 	struct nsim_dev *nsim_dev;
54 	struct nsim_dev_port *nsim_dev_port;
55 
56 	u64 tx_packets;
57 	u64 tx_bytes;
58 	struct u64_stats_sync syncp;
59 
60 	struct nsim_bus_dev *nsim_bus_dev;
61 
62 	struct bpf_prog	*bpf_offloaded;
63 	u32 bpf_offloaded_id;
64 
65 	struct xdp_attachment_info xdp;
66 	struct xdp_attachment_info xdp_hw;
67 
68 	bool bpf_tc_accept;
69 	bool bpf_tc_non_bound_accept;
70 	bool bpf_xdpdrv_accept;
71 	bool bpf_xdpoffload_accept;
72 
73 	bool bpf_map_accept;
74 	struct nsim_ipsec ipsec;
75 };
76 
77 struct netdevsim *
78 nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port);
79 void nsim_destroy(struct netdevsim *ns);
80 
81 #ifdef CONFIG_BPF_SYSCALL
82 int nsim_bpf_dev_init(struct nsim_dev *nsim_dev);
83 void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev);
84 int nsim_bpf_init(struct netdevsim *ns);
85 void nsim_bpf_uninit(struct netdevsim *ns);
86 int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
87 int nsim_bpf_disable_tc(struct netdevsim *ns);
88 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
89 			       void *type_data, void *cb_priv);
90 #else
91 
92 static inline int nsim_bpf_dev_init(struct nsim_dev *nsim_dev)
93 {
94 	return 0;
95 }
96 
97 static inline void nsim_bpf_dev_exit(struct nsim_dev *nsim_dev)
98 {
99 }
100 static inline int nsim_bpf_init(struct netdevsim *ns)
101 {
102 	return 0;
103 }
104 
105 static inline void nsim_bpf_uninit(struct netdevsim *ns)
106 {
107 }
108 
109 static inline int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
110 {
111 	return bpf->command == XDP_QUERY_PROG ? 0 : -EOPNOTSUPP;
112 }
113 
114 static inline int nsim_bpf_disable_tc(struct netdevsim *ns)
115 {
116 	return 0;
117 }
118 
119 static inline int
120 nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
121 			   void *cb_priv)
122 {
123 	return -EOPNOTSUPP;
124 }
125 #endif
126 
127 enum nsim_resource_id {
128 	NSIM_RESOURCE_NONE,   /* DEVLINK_RESOURCE_ID_PARENT_TOP */
129 	NSIM_RESOURCE_IPV4,
130 	NSIM_RESOURCE_IPV4_FIB,
131 	NSIM_RESOURCE_IPV4_FIB_RULES,
132 	NSIM_RESOURCE_IPV6,
133 	NSIM_RESOURCE_IPV6_FIB,
134 	NSIM_RESOURCE_IPV6_FIB_RULES,
135 };
136 
137 struct nsim_dev_port {
138 	struct list_head list;
139 	struct devlink_port devlink_port;
140 	unsigned int port_index;
141 	struct dentry *ddir;
142 	struct netdevsim *ns;
143 };
144 
145 struct nsim_dev {
146 	struct nsim_bus_dev *nsim_bus_dev;
147 	struct nsim_fib_data *fib_data;
148 	struct dentry *ddir;
149 	struct dentry *ports_ddir;
150 	struct bpf_offload_dev *bpf_dev;
151 	bool bpf_bind_accept;
152 	u32 bpf_bind_verifier_delay;
153 	struct dentry *ddir_bpf_bound_progs;
154 	u32 prog_id_gen;
155 	struct list_head bpf_bound_progs;
156 	struct list_head bpf_bound_maps;
157 	struct netdev_phys_item_id switch_id;
158 	struct list_head port_list;
159 	struct mutex port_list_lock; /* protects port list */
160 };
161 
162 int nsim_dev_init(void);
163 void nsim_dev_exit(void);
164 int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev);
165 void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev);
166 int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
167 		      unsigned int port_index);
168 int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
169 		      unsigned int port_index);
170 
171 struct nsim_fib_data *nsim_fib_create(void);
172 void nsim_fib_destroy(struct nsim_fib_data *fib_data);
173 u64 nsim_fib_get_val(struct nsim_fib_data *fib_data,
174 		     enum nsim_resource_id res_id, bool max);
175 int nsim_fib_set_max(struct nsim_fib_data *fib_data,
176 		     enum nsim_resource_id res_id, u64 val,
177 		     struct netlink_ext_ack *extack);
178 
179 #if IS_ENABLED(CONFIG_XFRM_OFFLOAD)
180 void nsim_ipsec_init(struct netdevsim *ns);
181 void nsim_ipsec_teardown(struct netdevsim *ns);
182 bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb);
183 #else
184 static inline void nsim_ipsec_init(struct netdevsim *ns)
185 {
186 }
187 
188 static inline void nsim_ipsec_teardown(struct netdevsim *ns)
189 {
190 }
191 
192 static inline bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb)
193 {
194 	return true;
195 }
196 #endif
197 
198 struct nsim_vf_config {
199 	int link_state;
200 	u16 min_tx_rate;
201 	u16 max_tx_rate;
202 	u16 vlan;
203 	__be16 vlan_proto;
204 	u16 qos;
205 	u8 vf_mac[ETH_ALEN];
206 	bool spoofchk_enabled;
207 	bool trusted;
208 	bool rss_query_enabled;
209 };
210 
211 struct nsim_bus_dev {
212 	struct device dev;
213 	struct list_head list;
214 	unsigned int port_count;
215 	unsigned int num_vfs;
216 	struct nsim_vf_config *vfconfigs;
217 };
218 
219 int nsim_bus_init(void);
220 void nsim_bus_exit(void);
221