change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/scripts/bpf_helpers_doc.py
..
..
@@ -1,7 +1,7 @@
1
-#!/usr/bin/python3
1
+#!/usr/bin/env python3
2
2
 # SPDX-License-Identifier: GPL-2.0-only
3
3
 #
4
-# Copyright (C) 2018 Netronome Systems, Inc.
4
+# Copyright (C) 2018-2019 Netronome Systems, Inc.
5
5
 
6
6
 # In case user attempts to run with Python 2.
7
7
 from __future__ import print_function
..
..
@@ -39,7 +39,7 @@
39
39
         Break down helper function protocol into smaller chunks: return type,
40
40
         name, distincts arguments.
41
41
         """
42
-        arg_re = re.compile('((const )?(struct )?(\w+|...))( (\**)(\w+))?$')
42
+        arg_re = re.compile('((\w+ )*?(\w+|...))( (\**)(\w+))?$')
43
43
         res = {}
44
44
         proto_re = re.compile('(.+) (\**)(\w+)\(((([^,]+)(, )?){1,5})\)$')
45
45
 
..
..
@@ -54,8 +54,8 @@
54
54
             capture = arg_re.match(a)
55
55
             res['args'].append({
56
56
                 'type' : capture.group(1),
57
-                'star' : capture.group(6),
58
-                'name' : capture.group(7)
57
+                'star' : capture.group(5),
58
+                'name' : capture.group(6)
59
59
             })
60
60
 
61
61
         return res
..
..
@@ -158,8 +158,6 @@
158
158
                 break
159
159
 
160
160
         self.reader.close()
161
-        print('Parsed description of %d helper function(s)' % len(self.helpers),
162
-              file=sys.stderr)
163
161
 
164
162
 ###############################################################################
165
163
 
..
..
@@ -320,6 +318,11 @@
320
318
   of eBPF maps are used with a given helper function.
321
319
 * *kernel/bpf/* directory contains other files in which additional helpers are
322
320
   defined (for cgroups, sockmaps, etc.).
321
+* The bpftool utility can be used to probe the availability of helper functions
322
+  on the system (as well as supported program and map types, and a number of
323
+  other parameters). To do so, run **bpftool feature probe** (see
324
+  **bpftool-feature**\ (8) for details). Add the **unprivileged** keyword to
325
+  list features available to unprivileged users.
323
326
 
324
327
 Compatibility between helper functions and program types can generally be found
325
328
 in the files where helper functions are defined. Look for the **struct
..
..
@@ -340,6 +343,7 @@
340
343
 ========
341
344
 
342
345
 **bpf**\ (2),
346
+**bpftool**\ (8),
343
347
 **cgroups**\ (7),
344
348
 **ip**\ (8),
345
349
 **perf_event_open**\ (2),
..
..
@@ -391,6 +395,183 @@
391
395
 
392
396
         print('')
393
397
 
398
+class PrinterHelpers(Printer):
399
+    """
400
+    A printer for dumping collected information about helpers as C header to
401
+    be included from BPF program.
402
+    @helpers: array of Helper objects to print to standard output
403
+    """
404
+
405
+    type_fwds = [
406
+            'struct bpf_fib_lookup',
407
+            'struct bpf_sk_lookup',
408
+            'struct bpf_perf_event_data',
409
+            'struct bpf_perf_event_value',
410
+            'struct bpf_pidns_info',
411
+            'struct bpf_redir_neigh',
412
+            'struct bpf_sock',
413
+            'struct bpf_sock_addr',
414
+            'struct bpf_sock_ops',
415
+            'struct bpf_sock_tuple',
416
+            'struct bpf_spin_lock',
417
+            'struct bpf_sysctl',
418
+            'struct bpf_tcp_sock',
419
+            'struct bpf_tunnel_key',
420
+            'struct bpf_xfrm_state',
421
+            'struct pt_regs',
422
+            'struct sk_reuseport_md',
423
+            'struct sockaddr',
424
+            'struct tcphdr',
425
+            'struct seq_file',
426
+            'struct tcp6_sock',
427
+            'struct tcp_sock',
428
+            'struct tcp_timewait_sock',
429
+            'struct tcp_request_sock',
430
+            'struct udp6_sock',
431
+            'struct task_struct',
432
+
433
+            'struct __sk_buff',
434
+            'struct sk_msg_md',
435
+            'struct xdp_md',
436
+            'struct path',
437
+            'struct btf_ptr',
438
+    ]
439
+    known_types = {
440
+            '...',
441
+            'void',
442
+            'const void',
443
+            'char',
444
+            'const char',
445
+            'int',
446
+            'long',
447
+            'unsigned long',
448
+
449
+            '__be16',
450
+            '__be32',
451
+            '__wsum',
452
+
453
+            'struct bpf_fib_lookup',
454
+            'struct bpf_perf_event_data',
455
+            'struct bpf_perf_event_value',
456
+            'struct bpf_pidns_info',
457
+            'struct bpf_redir_neigh',
458
+            'struct bpf_sk_lookup',
459
+            'struct bpf_sock',
460
+            'struct bpf_sock_addr',
461
+            'struct bpf_sock_ops',
462
+            'struct bpf_sock_tuple',
463
+            'struct bpf_spin_lock',
464
+            'struct bpf_sysctl',
465
+            'struct bpf_tcp_sock',
466
+            'struct bpf_tunnel_key',
467
+            'struct bpf_xfrm_state',
468
+            'struct pt_regs',
469
+            'struct sk_reuseport_md',
470
+            'struct sockaddr',
471
+            'struct tcphdr',
472
+            'struct seq_file',
473
+            'struct tcp6_sock',
474
+            'struct tcp_sock',
475
+            'struct tcp_timewait_sock',
476
+            'struct tcp_request_sock',
477
+            'struct udp6_sock',
478
+            'struct task_struct',
479
+            'struct path',
480
+            'struct btf_ptr',
481
+    }
482
+    mapped_types = {
483
+            'u8': '__u8',
484
+            'u16': '__u16',
485
+            'u32': '__u32',
486
+            'u64': '__u64',
487
+            's8': '__s8',
488
+            's16': '__s16',
489
+            's32': '__s32',
490
+            's64': '__s64',
491
+            'size_t': 'unsigned long',
492
+            'struct bpf_map': 'void',
493
+            'struct sk_buff': 'struct __sk_buff',
494
+            'const struct sk_buff': 'const struct __sk_buff',
495
+            'struct sk_msg_buff': 'struct sk_msg_md',
496
+            'struct xdp_buff': 'struct xdp_md',
497
+    }
498
+    # Helpers overloaded for different context types.
499
+    overloaded_helpers = [
500
+        'bpf_get_socket_cookie',
501
+        'bpf_sk_assign',
502
+    ]
503
+
504
+    def print_header(self):
505
+        header = '''\
506
+/* This is auto-generated file. See bpf_helpers_doc.py for details. */
507
+
508
+/* Forward declarations of BPF structs */'''
509
+
510
+        print(header)
511
+        for fwd in self.type_fwds:
512
+            print('%s;' % fwd)
513
+        print('')
514
+
515
+    def print_footer(self):
516
+        footer = ''
517
+        print(footer)
518
+
519
+    def map_type(self, t):
520
+        if t in self.known_types:
521
+            return t
522
+        if t in self.mapped_types:
523
+            return self.mapped_types[t]
524
+        print("Unrecognized type '%s', please add it to known types!" % t,
525
+              file=sys.stderr)
526
+        sys.exit(1)
527
+
528
+    seen_helpers = set()
529
+
530
+    def print_one(self, helper):
531
+        proto = helper.proto_break_down()
532
+
533
+        if proto['name'] in self.seen_helpers:
534
+            return
535
+        self.seen_helpers.add(proto['name'])
536
+
537
+        print('/*')
538
+        print(" * %s" % proto['name'])
539
+        print(" *")
540
+        if (helper.desc):
541
+            # Do not strip all newline characters: formatted code at the end of
542
+            # a section must be followed by a blank line.
543
+            for line in re.sub('\n$', '', helper.desc, count=1).split('\n'):
544
+                print(' *{}{}'.format(' \t' if line else '', line))
545
+
546
+        if (helper.ret):
547
+            print(' *')
548
+            print(' * Returns')
549
+            for line in helper.ret.rstrip().split('\n'):
550
+                print(' *{}{}'.format(' \t' if line else '', line))
551
+
552
+        print(' */')
553
+        print('static %s %s(*%s)(' % (self.map_type(proto['ret_type']),
554
+                                      proto['ret_star'], proto['name']), end='')
555
+        comma = ''
556
+        for i, a in enumerate(proto['args']):
557
+            t = a['type']
558
+            n = a['name']
559
+            if proto['name'] in self.overloaded_helpers and i == 0:
560
+                    t = 'void'
561
+                    n = 'ctx'
562
+            one_arg = '{}{}'.format(comma, self.map_type(t))
563
+            if n:
564
+                if a['star']:
565
+                    one_arg += ' {}'.format(a['star'])
566
+                else:
567
+                    one_arg += ' '
568
+                one_arg += '{}'.format(n)
569
+            comma = ', '
570
+            print(one_arg, end='')
571
+
572
+        print(') = (void *) %d;' % len(self.seen_helpers))
573
+        print('')
574
+
394
575
 ###############################################################################
395
576
 
396
577
 # If script is launched from scripts/ from kernel tree and can access
..
..
@@ -405,6 +586,8 @@
405
586
 The RST-formatted output produced can be turned into a manual page with the
406
587
 rst2man utility.
407
588
 """)
589
+argParser.add_argument('--header', action='store_true',
590
+                       help='generate C header file')
408
591
 if (os.path.isfile(bpfh)):
409
592
     argParser.add_argument('--filename', help='path to include/uapi/linux/bpf.h',
410
593
                            default=bpfh)
..
..
@@ -417,5 +600,8 @@
417
600
 headerParser.run()
418
601
 
419
602
 # Print formatted output to standard output.
420
-printer = PrinterRST(headerParser.helpers)
603
+if args.header:
604
+    printer = PrinterHelpers(headerParser.helpers)
605
+else:
606
+    printer = PrinterRST(headerParser.helpers)
421
607
 printer.print_all()