1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (c) 2023 Isovalent */ 3 #ifndef __NET_TCX_H 4 #define __NET_TCX_H 5 6 #include <linux/bpf.h> 7 #include <linux/bpf_mprog.h> 8 9 #include <net/sch_generic.h> 10 11 struct mini_Qdisc; 12 13 struct tcx_entry { 14 struct mini_Qdisc __rcu *miniq; 15 struct bpf_mprog_bundle bundle; 16 bool miniq_active; 17 struct rcu_head rcu; 18 }; 19 20 struct tcx_link { 21 struct bpf_link link; 22 struct net_device *dev; 23 u32 location; 24 }; 25 26 static inline void tcx_set_ingress(struct sk_buff *skb, bool ingress) 27 { 28 #ifdef CONFIG_NET_XGRESS 29 skb->tc_at_ingress = ingress; 30 #endif 31 } 32 33 #ifdef CONFIG_NET_XGRESS 34 static inline struct tcx_entry *tcx_entry(struct bpf_mprog_entry *entry) 35 { 36 struct bpf_mprog_bundle *bundle = entry->parent; 37 38 return container_of(bundle, struct tcx_entry, bundle); 39 } 40 41 static inline struct tcx_link *tcx_link(const struct bpf_link *link) 42 { 43 return container_of(link, struct tcx_link, link); 44 } 45 46 void tcx_inc(void); 47 void tcx_dec(void); 48 49 static inline void tcx_entry_sync(void) 50 { 51 /* bpf_mprog_entry got a/b swapped, therefore ensure that 52 * there are no inflight users on the old one anymore. 53 */ 54 synchronize_rcu(); 55 } 56 57 static inline void 58 tcx_entry_update(struct net_device *dev, struct bpf_mprog_entry *entry, 59 bool ingress) 60 { 61 ASSERT_RTNL(); 62 if (ingress) 63 rcu_assign_pointer(dev->tcx_ingress, entry); 64 else 65 rcu_assign_pointer(dev->tcx_egress, entry); 66 } 67 68 static inline struct bpf_mprog_entry * 69 tcx_entry_fetch(struct net_device *dev, bool ingress) 70 { 71 ASSERT_RTNL(); 72 if (ingress) 73 return rcu_dereference_rtnl(dev->tcx_ingress); 74 else 75 return rcu_dereference_rtnl(dev->tcx_egress); 76 } 77 78 static inline struct bpf_mprog_entry *tcx_entry_create(void) 79 { 80 struct tcx_entry *tcx = kzalloc(sizeof(*tcx), GFP_KERNEL); 81 82 if (tcx) { 83 bpf_mprog_bundle_init(&tcx->bundle); 84 return &tcx->bundle.a; 85 } 86 return NULL; 87 } 88 89 static inline void tcx_entry_free(struct bpf_mprog_entry *entry) 90 { 91 kfree_rcu(tcx_entry(entry), rcu); 92 } 93 94 static inline struct bpf_mprog_entry * 95 tcx_entry_fetch_or_create(struct net_device *dev, bool ingress, bool *created) 96 { 97 struct bpf_mprog_entry *entry = tcx_entry_fetch(dev, ingress); 98 99 *created = false; 100 if (!entry) { 101 entry = tcx_entry_create(); 102 if (!entry) 103 return NULL; 104 *created = true; 105 } 106 return entry; 107 } 108 109 static inline void tcx_skeys_inc(bool ingress) 110 { 111 tcx_inc(); 112 if (ingress) 113 net_inc_ingress_queue(); 114 else 115 net_inc_egress_queue(); 116 } 117 118 static inline void tcx_skeys_dec(bool ingress) 119 { 120 if (ingress) 121 net_dec_ingress_queue(); 122 else 123 net_dec_egress_queue(); 124 tcx_dec(); 125 } 126 127 static inline void tcx_miniq_set_active(struct bpf_mprog_entry *entry, 128 const bool active) 129 { 130 ASSERT_RTNL(); 131 tcx_entry(entry)->miniq_active = active; 132 } 133 134 static inline bool tcx_entry_is_active(struct bpf_mprog_entry *entry) 135 { 136 ASSERT_RTNL(); 137 return bpf_mprog_total(entry) || tcx_entry(entry)->miniq_active; 138 } 139 140 static inline enum tcx_action_base tcx_action_code(struct sk_buff *skb, 141 int code) 142 { 143 switch (code) { 144 case TCX_PASS: 145 skb->tc_index = qdisc_skb_cb(skb)->tc_classid; 146 fallthrough; 147 case TCX_DROP: 148 case TCX_REDIRECT: 149 return code; 150 case TCX_NEXT: 151 default: 152 return TCX_NEXT; 153 } 154 } 155 #endif /* CONFIG_NET_XGRESS */ 156 157 #if defined(CONFIG_NET_XGRESS) && defined(CONFIG_BPF_SYSCALL) 158 int tcx_prog_attach(const union bpf_attr *attr, struct bpf_prog *prog); 159 int tcx_link_attach(const union bpf_attr *attr, struct bpf_prog *prog); 160 int tcx_prog_detach(const union bpf_attr *attr, struct bpf_prog *prog); 161 void tcx_uninstall(struct net_device *dev, bool ingress); 162 163 int tcx_prog_query(const union bpf_attr *attr, 164 union bpf_attr __user *uattr); 165 166 static inline void dev_tcx_uninstall(struct net_device *dev) 167 { 168 ASSERT_RTNL(); 169 tcx_uninstall(dev, true); 170 tcx_uninstall(dev, false); 171 } 172 #else 173 static inline int tcx_prog_attach(const union bpf_attr *attr, 174 struct bpf_prog *prog) 175 { 176 return -EINVAL; 177 } 178 179 static inline int tcx_link_attach(const union bpf_attr *attr, 180 struct bpf_prog *prog) 181 { 182 return -EINVAL; 183 } 184 185 static inline int tcx_prog_detach(const union bpf_attr *attr, 186 struct bpf_prog *prog) 187 { 188 return -EINVAL; 189 } 190 191 static inline int tcx_prog_query(const union bpf_attr *attr, 192 union bpf_attr __user *uattr) 193 { 194 return -EINVAL; 195 } 196 197 static inline void dev_tcx_uninstall(struct net_device *dev) 198 { 199 } 200 #endif /* CONFIG_NET_XGRESS && CONFIG_BPF_SYSCALL */ 201 #endif /* __NET_TCX_H */ 202