Merge pull request #472 from iovisor/ast_dev

get rid of version checks

src/cc/compat/linux/bpf.h

@@ -101,12 +101,15 @@ enum bpf_prog_type {
 #define BPF_NOEXIST	1 /* create new element if it didn't exist */
 #define BPF_EXIST	2 /* update existing element */
 
+#define BPF_F_NO_PREALLOC	(1U << 0)
+
 union bpf_attr {
 	struct { /* anonymous struct used by BPF_MAP_CREATE command */
 		__u32	map_type;	/* one of enum bpf_map_type */
 		__u32	key_size;	/* size of key in bytes */
 		__u32	value_size;	/* size of value in bytes */
 		__u32	max_entries;	/* max number of entries in a map */
+		__u32	map_flags;	/* prealloc or not */
 	};
 
 	struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
@@ -298,6 +301,17 @@ enum bpf_func_id {
 	 * Return: csum result
 	 */
 	BPF_FUNC_csum_diff,
+
+	/**
+	 * bpf_skb_[gs]et_tunnel_opt(skb, opt, size)
+	 * retrieve or populate tunnel options metadata
+	 * @skb: pointer to skb
+	 * @opt: pointer to raw tunnel option data
+	 * @size: size of @opt
+	 * Return: 0 on success for set, option size for get
+	 */
+	BPF_FUNC_skb_get_tunnel_opt,
+	BPF_FUNC_skb_set_tunnel_opt,
 	__BPF_FUNC_MAX_ID,
 };
 
@@ -305,6 +319,7 @@ enum bpf_func_id {
 
 /* BPF_FUNC_skb_store_bytes flags. */
 #define BPF_F_RECOMPUTE_CSUM		(1ULL << 0)
+#define BPF_F_INVALIDATE_HASH		(1ULL << 1)
 
 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags.
  * First 4 bits are for passing the header field size.
@@ -327,6 +342,10 @@ enum bpf_func_id {
 #define BPF_F_FAST_STACK_CMP		(1ULL << 9)
 #define BPF_F_REUSE_STACKID		(1ULL << 10)
 
+/* BPF_FUNC_skb_set_tunnel_key flags. */
+#define BPF_F_ZERO_CSUM_TX		(1ULL << 1)
+#define BPF_F_DONT_FRAGMENT		(1ULL << 2)
+
 /* user accessible mirror of in-kernel sk_buff.
  * new fields can only be added to the end of this structure
  */
@@ -356,6 +375,8 @@ struct bpf_tunnel_key {
 	};
 	__u8 tunnel_tos;
 	__u8 tunnel_ttl;
+	__u16 tunnel_ext;
+	__u32 tunnel_label;
 };
 
 #endif /* _UAPI__LINUX_BPF_H__ */

src/cc/export/helpers.h

@@ -142,7 +142,6 @@ static u32 (*bpf_get_prandom_u32)(void) =
 static int (*bpf_trace_printk_)(const char *fmt, u64 fmt_size, ...) =
   (void *) BPF_FUNC_trace_printk;
 int bpf_trace_printk(const char *fmt, ...) asm("llvm.bpf.extra");
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)
 static void bpf_tail_call_(u64 map_fd, void *ctx, int index) {
   ((void (*)(void *, u64, int))BPF_FUNC_tail_call)(ctx, map_fd, index);
 }
@@ -156,8 +155,6 @@ static u64 (*bpf_get_current_uid_gid)(void) =
   (void *) BPF_FUNC_get_current_uid_gid;
 static int (*bpf_get_current_comm)(void *buf, int buf_size) =
   (void *) BPF_FUNC_get_current_comm;
-#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
 static u64 (*bpf_get_cgroup_classid)(void *ctx) =
   (void *) BPF_FUNC_get_cgroup_classid;
 static u64 (*bpf_skb_vlan_push)(void *ctx, u16 proto, u16 vlan_tci) =
@@ -170,20 +167,14 @@ static int (*bpf_skb_set_tunnel_key)(void *ctx, void *from, u32 size, u64 flags)
   (void *) BPF_FUNC_skb_set_tunnel_key;
 static int (*bpf_perf_event_read)(void *map, u32 index) =
   (void *) BPF_FUNC_perf_event_read;
-#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,4,0)
 static int (*bpf_redirect)(int ifindex, u32 flags) =
   (void *) BPF_FUNC_redirect;
 static u32 (*bpf_get_route_realm)(void *ctx) =
   (void *) BPF_FUNC_get_route_realm;
 static int (*bpf_perf_event_output)(void *ctx, void *map, u32 index, void *data, u32 size) =
   (void *) BPF_FUNC_perf_event_output;
-#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,5,0)
 static int (*bpf_skb_load_bytes)(void *ctx, int offset, void *to, u32 len) =
   (void *) BPF_FUNC_skb_load_bytes;
-#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)
 static int (*bpf_get_stackid_)(void *ctx, void *map, u64 flags) =
   (void *) BPF_FUNC_get_stackid;
 static inline __attribute__((always_inline))
@@ -192,7 +183,6 @@ int bpf_get_stackid(uintptr_t map, void *ctx, u64 flags) {
 }
 static int (*bpf_csum_diff)(void *from, u64 from_size, void *to, u64 to_size, u64 seed) =
   (void *) BPF_FUNC_csum_diff;
-#endif
 
 /* llvm builtin functions that eBPF C program may use to
  * emit BPF_LD_ABS and BPF_LD_IND instructions

src/cc/exported_files.cc

@@ -25,6 +25,10 @@ namespace ebpf {
 // see http://www.stroustrup.com/C++11FAQ.html#raw-strings
 
 map<string, const char *> ExportedFiles::headers_ = {
+  {
+    "/virtual/include/bcc/bpf.h",
+    #include "compat/linux/virtual_bpf.h"
+  },
   {
     "/virtual/include/bcc/proto.h",
     #include "export/proto.h"

src/cc/frontends/clang/b_frontend_action.cc

@@ -585,17 +585,14 @@ bool BTypeVisitor::VisitVarDecl(VarDecl *Decl) {
         diag_.Report(Decl->getLocStart(), diag_id) << table.leaf_desc;
       }
     } else if (A->getName() == "maps/prog") {
-      if (KERNEL_VERSION(major,minor,0) >= KERNEL_VERSION(4,2,0))
       map_type = BPF_MAP_TYPE_PROG_ARRAY;
     } else if (A->getName() == "maps/perf_output") {
-      if (KERNEL_VERSION(major,minor,0) >= KERNEL_VERSION(4,3,0))
       map_type = BPF_MAP_TYPE_PERF_EVENT_ARRAY;
       int numcpu = sysconf(_SC_NPROCESSORS_ONLN);
       if (numcpu <= 0)
         numcpu = 1;
       table.max_entries = numcpu;
     } else if (A->getName() == "maps/perf_array") {
-      if (KERNEL_VERSION(major,minor,0) >= KERNEL_VERSION(4,3,0))
       map_type = BPF_MAP_TYPE_PERF_EVENT_ARRAY;
     } else if (A->getName() == "maps/stacktrace") {
       map_type = BPF_MAP_TYPE_STACK_TRACE;

src/cc/frontends/clang/loader.cc

@@ -77,8 +77,6 @@ int ClangLoader::parse(unique_ptr<llvm::Module> *mod, unique_ptr<vector<TableDes
   using namespace clang;
 
   string main_path = "/virtual/main.c";
-  string proto_path = "/virtual/include/bcc/proto.h";
-  string helpers_path = "/virtual/include/bcc/helpers.h";
   unique_ptr<llvm::MemoryBuffer> main_buf;
   struct utsname un;
   uname(&un);
@@ -110,6 +108,8 @@ int ClangLoader::parse(unique_ptr<llvm::Module> *mod, unique_ptr<vector<TableDes
   if (kbuild_helper.get_flags(un.machine, &kflags))
     return -1;
   kflags.push_back("-include");
+  kflags.push_back("/virtual/include/bcc/bpf.h");
+  kflags.push_back("-include");
   kflags.push_back("/virtual/include/bcc/helpers.h");
   kflags.push_back("-isystem");
   kflags.push_back("/virtual/include");