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/xdp.h>
22
23 #define DRV_NAME "netdevsim"
24
25 #define NSIM_XDP_MAX_MTU 4000
26
27 #define NSIM_EA(extack, msg) NL_SET_ERR_MSG_MOD((extack), msg)
28
29 struct bpf_prog;
30 struct bpf_offload_dev;
31 struct dentry;
32 struct nsim_vf_config;
33
34 struct netdevsim_shared_dev {
35 unsigned int refcnt;
36 u32 switch_id;
37
38 struct dentry *ddir;
39
40 struct bpf_offload_dev *bpf_dev;
41
42 struct dentry *ddir_bpf_bound_progs;
43 u32 prog_id_gen;
44
45 struct list_head bpf_bound_progs;
46 struct list_head bpf_bound_maps;
47 };
48
49 #define NSIM_IPSEC_MAX_SA_COUNT 33
50 #define NSIM_IPSEC_VALID BIT(31)
51
52 struct nsim_sa {
53 struct xfrm_state *xs;
54 __be32 ipaddr[4];
55 u32 key[4];
56 u32 salt;
57 bool used;
58 bool crypt;
59 bool rx;
60 };
61
62 struct nsim_ipsec {
63 struct nsim_sa sa[NSIM_IPSEC_MAX_SA_COUNT];
64 struct dentry *pfile;
65 u32 count;
66 u32 tx;
67 u32 ok;
68 };
69
70 struct netdevsim {
71 struct net_device *netdev;
72
73 u64 tx_packets;
74 u64 tx_bytes;
75 struct u64_stats_sync syncp;
76
77 struct device dev;
78 struct netdevsim_shared_dev *sdev;
79
80 struct dentry *ddir;
81
82 unsigned int num_vfs;
83 struct nsim_vf_config *vfconfigs;
84
85 struct bpf_prog *bpf_offloaded;
86 u32 bpf_offloaded_id;
87
88 struct xdp_attachment_info xdp;
89 struct xdp_attachment_info xdp_hw;
90
91 bool bpf_bind_accept;
92 u32 bpf_bind_verifier_delay;
93
94 bool bpf_tc_accept;
95 bool bpf_tc_non_bound_accept;
96 bool bpf_xdpdrv_accept;
97 bool bpf_xdpoffload_accept;
98
99 bool bpf_map_accept;
100 #if IS_ENABLED(CONFIG_NET_DEVLINK)
101 struct devlink *devlink;
102 #endif
103 struct nsim_ipsec ipsec;
104 };
105
106 #ifdef CONFIG_BPF_SYSCALL
107 int nsim_bpf_init(struct netdevsim *ns);
108 void nsim_bpf_uninit(struct netdevsim *ns);
109 int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
110 int nsim_bpf_disable_tc(struct netdevsim *ns);
111 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
112 void *type_data, void *cb_priv);
113 #else
nsim_bpf_init(struct netdevsim * ns)114 static inline int nsim_bpf_init(struct netdevsim *ns)
115 {
116 return 0;
117 }
118
nsim_bpf_uninit(struct netdevsim * ns)119 static inline void nsim_bpf_uninit(struct netdevsim *ns)
120 {
121 }
122
nsim_bpf(struct net_device * dev,struct netdev_bpf * bpf)123 static inline int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
124 {
125 return bpf->command == XDP_QUERY_PROG ? 0 : -EOPNOTSUPP;
126 }
127
nsim_bpf_disable_tc(struct netdevsim * ns)128 static inline int nsim_bpf_disable_tc(struct netdevsim *ns)
129 {
130 return 0;
131 }
132
133 static inline int
nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,void * type_data,void * cb_priv)134 nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
135 void *cb_priv)
136 {
137 return -EOPNOTSUPP;
138 }
139 #endif
140
141 #if IS_ENABLED(CONFIG_NET_DEVLINK)
142 enum nsim_resource_id {
143 NSIM_RESOURCE_NONE, /* DEVLINK_RESOURCE_ID_PARENT_TOP */
144 NSIM_RESOURCE_IPV4,
145 NSIM_RESOURCE_IPV4_FIB,
146 NSIM_RESOURCE_IPV4_FIB_RULES,
147 NSIM_RESOURCE_IPV6,
148 NSIM_RESOURCE_IPV6_FIB,
149 NSIM_RESOURCE_IPV6_FIB_RULES,
150 };
151
152 int nsim_devlink_setup(struct netdevsim *ns);
153 void nsim_devlink_teardown(struct netdevsim *ns);
154
155 int nsim_devlink_init(void);
156 void nsim_devlink_exit(void);
157
158 int nsim_fib_init(void);
159 void nsim_fib_exit(void);
160 u64 nsim_fib_get_val(struct net *net, enum nsim_resource_id res_id, bool max);
161 int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val,
162 struct netlink_ext_ack *extack);
163 #else
nsim_devlink_setup(struct netdevsim * ns)164 static inline int nsim_devlink_setup(struct netdevsim *ns)
165 {
166 return 0;
167 }
168
nsim_devlink_teardown(struct netdevsim * ns)169 static inline void nsim_devlink_teardown(struct netdevsim *ns)
170 {
171 }
172
nsim_devlink_init(void)173 static inline int nsim_devlink_init(void)
174 {
175 return 0;
176 }
177
nsim_devlink_exit(void)178 static inline void nsim_devlink_exit(void)
179 {
180 }
181 #endif
182
183 #if IS_ENABLED(CONFIG_XFRM_OFFLOAD)
184 void nsim_ipsec_init(struct netdevsim *ns);
185 void nsim_ipsec_teardown(struct netdevsim *ns);
186 bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb);
187 #else
nsim_ipsec_init(struct netdevsim * ns)188 static inline void nsim_ipsec_init(struct netdevsim *ns)
189 {
190 }
191
nsim_ipsec_teardown(struct netdevsim * ns)192 static inline void nsim_ipsec_teardown(struct netdevsim *ns)
193 {
194 }
195
nsim_ipsec_tx(struct netdevsim * ns,struct sk_buff * skb)196 static inline bool nsim_ipsec_tx(struct netdevsim *ns, struct sk_buff *skb)
197 {
198 return true;
199 }
200 #endif
201
to_nsim(struct device * ptr)202 static inline struct netdevsim *to_nsim(struct device *ptr)
203 {
204 return container_of(ptr, struct netdevsim, dev);
205 }
206
