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 
22 #define DRV_NAME	"netdevsim"
23 
24 #define NSIM_XDP_MAX_MTU	4000
25 
26 #define NSIM_EA(extack, msg)	NL_SET_ERR_MSG_MOD((extack), msg)
27 
28 struct bpf_prog;
29 struct dentry;
30 struct nsim_vf_config;
31 
32 struct netdevsim {
33 	struct net_device *netdev;
34 
35 	u64 tx_packets;
36 	u64 tx_bytes;
37 	struct u64_stats_sync syncp;
38 
39 	struct device dev;
40 
41 	struct dentry *ddir;
42 
43 	unsigned int num_vfs;
44 	struct nsim_vf_config *vfconfigs;
45 
46 	struct bpf_prog	*bpf_offloaded;
47 	u32 bpf_offloaded_id;
48 
49 	u32 xdp_flags;
50 	int xdp_prog_mode;
51 	struct bpf_prog	*xdp_prog;
52 
53 	u32 prog_id_gen;
54 
55 	bool bpf_bind_accept;
56 	u32 bpf_bind_verifier_delay;
57 	struct dentry *ddir_bpf_bound_progs;
58 	struct list_head bpf_bound_progs;
59 
60 	bool bpf_tc_accept;
61 	bool bpf_tc_non_bound_accept;
62 	bool bpf_xdpdrv_accept;
63 	bool bpf_xdpoffload_accept;
64 
65 	bool bpf_map_accept;
66 	struct list_head bpf_bound_maps;
67 };
68 
69 extern struct dentry *nsim_ddir;
70 
71 #ifdef CONFIG_BPF_SYSCALL
72 int nsim_bpf_init(struct netdevsim *ns);
73 void nsim_bpf_uninit(struct netdevsim *ns);
74 int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf);
75 int nsim_bpf_disable_tc(struct netdevsim *ns);
76 int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
77 			       void *type_data, void *cb_priv);
78 #else
79 static inline int nsim_bpf_init(struct netdevsim *ns)
80 {
81 	return 0;
82 }
83 
84 static inline void nsim_bpf_uninit(struct netdevsim *ns)
85 {
86 }
87 
88 static inline int nsim_bpf(struct net_device *dev, struct netdev_bpf *bpf)
89 {
90 	return bpf->command == XDP_QUERY_PROG ? 0 : -EOPNOTSUPP;
91 }
92 
93 static inline int nsim_bpf_disable_tc(struct netdevsim *ns)
94 {
95 	return 0;
96 }
97 
98 static inline int
99 nsim_bpf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
100 			   void *cb_priv)
101 {
102 	return -EOPNOTSUPP;
103 }
104 #endif
105 
106 static inline struct netdevsim *to_nsim(struct device *ptr)
107 {
108 	return container_of(ptr, struct netdevsim, dev);
109 }
110