Re: sys/dev/usb/if_axen.c

[sc.dying%gmail.com@localhost]

hi,

On 2023/11/13 13:28, Michael van Elst wrote:
> makoto%ki.nu@localhost (Makoto Fujiwara) writes:
> 
>> I've compared to openbsd: if_axen.c 
>>   https://raw.githubusercontent.com/openbsd/src/master/sys/dev/usb/if_axen.c
>> to N, and there are so many differencies.
> 
>> Does this (N) if_axen.c works on any installation ?
> 
> 
> axen seems to work, but I can see that the code does nonsense if
> you receive something a buffer with pkt_count == 0.
> 
> I suggest to dump the whole buffer as it was received.

My rx_loop now hexdump its buffer.
I perform iperf between 179A and other host.
This is a part of rxbuf dump.

1700366741.414702 axen_uno_rx_loop#0@0: rxbuf: 3064 bytes @ 0xffff0000088da000
1700366741.414702 axen_uno_rx_loop#0@0:  eeee207b d26f4276 00e04c53 44580800
                                  0000   <-- pkt #1
1700366741.414703 axen_uno_rx_loop#0@0:  450005dc 60cb4000 400650f5 c0a80104
1700366741.414703 axen_uno_rx_loop#0@0:  c0a80107 e4c71388 1b8bd508 9f8f2f31
1700366741.414703 axen_uno_rx_loop#0@0:  80102014 18d80000 0101080a 00000004
1700366741.414703 axen_uno_rx_loop#0@0:  00000005 c84e3c5c 8bd907b3 f4adb29d
1700366741.414704 axen_uno_rx_loop#0@0:  6ad24e1d 1e2543ee 32697ee7 0abef55e
1700366741.414704 axen_uno_rx_loop#0@0:  d7c11bca 9d027273 53ec1fbc 6508201b
1700366741.414704 axen_uno_rx_loop#0@0:  5e4e7679 9f9a38fd c0133df9 21a5677c
1700366741.414704 axen_uno_rx_loop#0@0:  0542fadd 562c8053 bb89dc3f f4ed406a
1700366741.414705 axen_uno_rx_loop#0@0:  0011b337 dbb6a8a8 f8d0022c 9983dcda
1700366741.414705 axen_uno_rx_loop#0@0:  b4825199 42f3db4f b4fcdca1 8e3404cc
1700366741.414705 axen_uno_rx_loop#0@0:  4ad71c09 0ea081da 705a6175 2a1b4429
1700366741.414705 axen_uno_rx_loop#0@0:  1ea81312 9604400d 8f468791 fa02bf04
1700366741.414706 axen_uno_rx_loop#0@0:  383ab1b8 e96b3fd4 470641dc 6f2df1a1
1700366741.414706 axen_uno_rx_loop#0@0:  97edf08f 02167f69 213cfd57 debaee5e
1700366741.414706 axen_uno_rx_loop#0@0:  77e46444 a02d18bc 634320d6 5462ddb3
1700366741.414707 axen_uno_rx_loop#0@0:  1d212542 7e6caa36 5ab5b565 510e134b
1700366741.414707 axen_uno_rx_loop#0@0:  4b879893 661868a7 95ae3626 a254c4bc
1700366741.414707 axen_uno_rx_loop#0@0:  04ea0dcf 56c2751f deeee255 5bc31b51
1700366741.414707 axen_uno_rx_loop#0@0:  32d0ef9a b76e5449 9e6868c2 8bce1a04
1700366741.414707 axen_uno_rx_loop#0@0:  a0fbebf5 b2f8cdf1 3d9ff296 2f011dbd
1700366741.414708 axen_uno_rx_loop#0@0:  002b74cd fd378d74 79c0ecbd 6221f4c0
1700366741.414708 axen_uno_rx_loop#0@0:  e0215217 31e35e7c 00a091e9 20c948cc
1700366741.414708 axen_uno_rx_loop#0@0:  7afc3d51 0a4e238a 67c5cc21 7fd62029
1700366741.414708 axen_uno_rx_loop#0@0:  e9a19089 8565e39c e7b42754 f5f77f71
1700366741.414708 axen_uno_rx_loop#0@0:  9477e217 ce72eb9e c4021c9a 386c7c40
1700366741.414709 axen_uno_rx_loop#0@0:  98b541d8 bfa940ba 69a0ccb4 38678212
1700366741.414709 axen_uno_rx_loop#0@0:  adef35b9 dc55d6a5 334884c7 77cf9c93
1700366741.414709 axen_uno_rx_loop#0@0:  1083a7b2 078a849e 8f038031 994289cc
1700366741.414709 axen_uno_rx_loop#0@0:  074a50ef a97bc117 9934bdb0 6410c348
1700366741.414709 axen_uno_rx_loop#0@0:  fcd7ab92 29d4fbf3 c1c30b2a 300dbfef
1700366741.414709 axen_uno_rx_loop#0@0:  d52d1b2e 7badbaf4 af5ae320 5ad5936f
1700366741.414710 axen_uno_rx_loop#0@0:  ef16fe32 d6455cd3 856ba821 a4539b52
1700366741.414710 axen_uno_rx_loop#0@0:  18418dc2 7a9e8925 6d79a54d f6f71d0e
1700366741.414710 axen_uno_rx_loop#0@0:  c7d2a831 c1a054d3 3e59661c 311a7f83
1700366741.414710 axen_uno_rx_loop#0@0:  ba687364 570c0e1d 53f36ea8 bd816a70
1700366741.414711 axen_uno_rx_loop#0@0:  1f157011 ae703a5a ceb9f7d8 cbd4d962
1700366741.414711 axen_uno_rx_loop#0@0:  9778087e 8a2690db 10e859b6 f984802d
1700366741.414711 axen_uno_rx_loop#0@0:  8bb30ebd 0899ff0b 0dd2b9f7 d5c51cb7
1700366741.414711 axen_uno_rx_loop#0@0:  953a92a4 794f3950 e135ca54 49c04aa5
1700366741.414711 axen_uno_rx_loop#0@0:  d14ebd93 4a1ab0bd 70ee7c61 121e8be9
1700366741.414712 axen_uno_rx_loop#0@0:  05e58c08 3c081868 9dba7e0c f26e5377
1700366741.414712 axen_uno_rx_loop#0@0:  20851cad 81514d59 3304bae3 7a3f6cd6
1700366741.414712 axen_uno_rx_loop#0@0:  859a62dc b1bbb221 1a49a2a5 1dcc8a54
1700366741.414712 axen_uno_rx_loop#0@0:  b3dd7eca 98ad8b8f 9ca16d9b 5c881cd2
1700366741.414712 axen_uno_rx_loop#0@0:  2624ff79 81848b6e 983f0d7b c436646d
1700366741.414712 axen_uno_rx_loop#0@0:  6e9464b0 53a05afa 8ed06d30 6887e8e4
1700366741.414713 axen_uno_rx_loop#0@0:  f7dd5843 76dd8e43 60d7b7d9 7108bbe4
1700366741.414713 axen_uno_rx_loop#0@0:  9596a085 936ba262 6d700539 a29857da
1700366741.414713 axen_uno_rx_loop#0@0:  2f397e7e 1691e6d8 5d21dd31 5481c337
1700366741.414713 axen_uno_rx_loop#0@0:  802f366c 50e01b37 a15a8760 f6854e94
1700366741.414713 axen_uno_rx_loop#0@0:  53a65f2b f09328f0 c4f533a3 7a96cb62
1700366741.414713 axen_uno_rx_loop#0@0:  ee817bf7 4e41aa80 1a2f4c41 16bc9f98
1700366741.414714 axen_uno_rx_loop#0@0:  abed5728 85eb07a8 26053a16 43ccc2fe
1700366741.414714 axen_uno_rx_loop#0@0:  25476ccb 420f91d0 cf7851f2 6fd78cf7
1700366741.414714 axen_uno_rx_loop#0@0:  49cecb97 47e06724 81b17b42 2b179898
1700366741.414714 axen_uno_rx_loop#0@0:  7a64143f 8e583d44 07e65bc1 5faf89ea
1700366741.414715 axen_uno_rx_loop#0@0:  6f13ee8a 61b2376d f557a5f1 522591e4
1700366741.414715 axen_uno_rx_loop#0@0:  bfc3c6cf 0a5b9c16 097776db 5f9996f1
1700366741.414715 axen_uno_rx_loop#0@0:  7429f979 e81a82de ab82071f bed8d8ca
1700366741.414715 axen_uno_rx_loop#0@0:  b78629fb 0226ff9e 3309d149 477120c4
1700366741.414715 axen_uno_rx_loop#0@0:  8b1b0fca e961ffe5 0cb2225c 9990e39c
1700366741.414716 axen_uno_rx_loop#0@0:  a025e3b5 418e4f2c 3b1d48e6 19a4ff48
1700366741.414716 axen_uno_rx_loop#0@0:  5f48b30e 1f0547d5 38780165 5a1429a3
1700366741.414716 axen_uno_rx_loop#0@0:  410a2351 3786ac7a 7725d781 76f3b56b
1700366741.414716 axen_uno_rx_loop#0@0:  e08e2217 8c3d8fa2 3c8c41d2 39475d1f
1700366741.414716 axen_uno_rx_loop#0@0:  5e93901d 5c33d027 1a3f7a49 b305771e
1700366741.414716 axen_uno_rx_loop#0@0:  45a98e14 1a961dcd 62ffd2b5 bc0a3f38
1700366741.414717 axen_uno_rx_loop#0@0:  a5a9dfa4 23d1360e 4ebcf27e 01e11362
1700366741.414717 axen_uno_rx_loop#0@0:  73d478e4 09996d02 35b032da ded03a97
1700366741.414717 axen_uno_rx_loop#0@0:  55ccbdbf 9de61e4f 8811ad4f 3c504081
1700366741.414717 axen_uno_rx_loop#0@0:  a75751f1 59e54533 30ea1fd8 1aa3298e
1700366741.414717 axen_uno_rx_loop#0@0:  c38100ab 268667a6 fae11ffc bc430be9
1700366741.414718 axen_uno_rx_loop#0@0:  a57d01f1 4527edae 71b27342 d593f5e3
1700366741.414718 axen_uno_rx_loop#0@0:  9e560bd3 ce1fd2dd 136ec12e fc1ba31e
1700366741.414718 axen_uno_rx_loop#0@0:  6d89444f 8f7c34be 493c94b2 34101b46
1700366741.414718 axen_uno_rx_loop#0@0:  2f1dfe3a 37ea59b2 b0e80141 2e92e495
1700366741.414718 axen_uno_rx_loop#0@0:  f33b572e cf350368 1e7037a9 4ebd761d
1700366741.414718 axen_uno_rx_loop#0@0:  1b088eff 77041c30 94b00794 94558aaa
1700366741.414719 axen_uno_rx_loop#0@0:  55382e1e c8b039a5 9d30093c 4f2cc83e
1700366741.414719 axen_uno_rx_loop#0@0:  54ab074c 75a08d83 1098cfda 565f4a21
1700366741.414719 axen_uno_rx_loop#0@0:  9127447c f38c58fd cdc002b8 4fbf3f3d
1700366741.414719 axen_uno_rx_loop#0@0:  87cec9b5 d886f303 ab30a607 f99a49d2
1700366741.414719 axen_uno_rx_loop#0@0:  831c154a d1a621ee 970c2d2a 54902057
1700366741.414720 axen_uno_rx_loop#0@0:  79fd3021 c071cb04 dbb5a8ab 35a6bf7c
1700366741.414720 axen_uno_rx_loop#0@0:  e6623d29 6924bd25 c9772dd5 dc655ed9
1700366741.414720 axen_uno_rx_loop#0@0:  137ade12 832e33f5 d108df42 1eff4ee0
1700366741.414720 axen_uno_rx_loop#0@0:  416565bf 18a73a5f a8dfa6b9 3d549733
1700366741.414720 axen_uno_rx_loop#0@0:  f1c77692 0cf01cf7 30c4fd44 9811a65b
1700366741.414721 axen_uno_rx_loop#0@0:  5dd770b2 e2db5fbc 5372ca65 555868b0
1700366741.414721 axen_uno_rx_loop#0@0:  ef5cab24 486462c2 cc487a54 78987723
1700366741.414721 axen_uno_rx_loop#0@0:  16c8cc52 08612fa7 3201f729 9ce568ac
1700366741.414721 axen_uno_rx_loop#0@0:  03662a37 d92ae79d cf488f51 ab69c553
1700366741.414721 axen_uno_rx_loop#0@0:  f7652ce7 012b435e c34f298d 1d91de5c
1700366741.414722 axen_uno_rx_loop#0@0:  a88e9532 194555b5 f377bd2e 0413f0e8
                                  0ec0                pkt #1    --> <garbage>
1700366741.414722 axen_uno_rx_loop#0@0:  eeee207b d26f4276 00e04c53 44580800
                                  0ed0   <-- pkt #2
1700366741.414722 axen_uno_rx_loop#0@0:  450005dc 56b64000 40065b0a c0a80104
1700366741.414722 axen_uno_rx_loop#0@0:  c0a80107 e4c71388 1b8bdab0 9f8f2f31
1700366741.414722 axen_uno_rx_loop#0@0:  80102014 6ad90000 0101080a 00000004
1700366741.414722 axen_uno_rx_loop#0@0:  00000005 7870e5e4 7ba53e1e 47a5a470
1700366741.414723 axen_uno_rx_loop#0@0:  45b6f7f9 ab6d3009 01368208 e791d237
1700366741.414723 axen_uno_rx_loop#0@0:  bee4d3a3 7f66686d 8c4a9cba aa249276
1700366741.414723 axen_uno_rx_loop#0@0:  edb48f58 959045e1 824fe1a4 e19d2a38
1700366741.414723 axen_uno_rx_loop#0@0:  11c89d13 453be8bd 1b067dfd aa31a44b
1700366741.414723 axen_uno_rx_loop#0@0:  dda666d3 de8ed86a fa2dfc64 715122ae
1700366741.414724 axen_uno_rx_loop#0@0:  32597ada 702072e4 97ca323f b091a79f
1700366741.414724 axen_uno_rx_loop#0@0:  8bb7c2cf 3cc1704e 1d794978 2a279cf0
1700366741.414724 axen_uno_rx_loop#0@0:  bdf48d62 37a4c38e 0b468463 eeee668c
1700366741.414724 axen_uno_rx_loop#0@0:  7593e4d6 cbaea8d2 91f1afb2 4d97fcd2
1700366741.414724 axen_uno_rx_loop#0@0:  23fa8389 b88a9185 927382c1 32fd2403
1700366741.414724 axen_uno_rx_loop#0@0:  5b1c9f7b 4b6de8b5 db7b5bb9 ef752bcc
1700366741.414725 axen_uno_rx_loop#0@0:  d53ad036 27e4fe97 a1e4a1c0 a2e9147a
1700366741.414725 axen_uno_rx_loop#0@0:  b9a7b6ab 0d541939 34c16606 cf87835f
1700366741.414725 axen_uno_rx_loop#0@0:  2b6a9e6b cae57899 e5e37722 fde3d957
1700366741.414725 axen_uno_rx_loop#0@0:  30594240 5e1621df 775ef1be e083d46d
1700366741.414725 axen_uno_rx_loop#0@0:  6c7c5570 beeac6e8 956869d0 639e586b
1700366741.414725 axen_uno_rx_loop#0@0:  e5e3c4e3 a1ebf8bb 03817386 c5223ba9
1700366741.414726 axen_uno_rx_loop#0@0:  e8c26420 94df0ae8 0871314d 77ed04ad
1700366741.414726 axen_uno_rx_loop#0@0:  1d3d5812 4f72bdc0 6bd4c2af 314acfaf
1700366741.414726 axen_uno_rx_loop#0@0:  2955c6cc df45ef17 48e6127e 09806bbb
1700366741.414726 axen_uno_rx_loop#0@0:  f6a30d5f d3c7a708 e22bc64c 1ad78871
1700366741.414727 axen_uno_rx_loop#0@0:  ce54b693 a314a692 63b7ef42 5dbd3051
1700366741.414727 axen_uno_rx_loop#0@0:  8a0b5ade 5950db7f bf0a73a0 eeb7a030
1700366741.414727 axen_uno_rx_loop#0@0:  d1aa615b 615a67e5 fd9d3d3f ca9a1d9b
1700366741.414727 axen_uno_rx_loop#0@0:  38cc3f4d cdaec28f 370aa0be c39be753
1700366741.414727 axen_uno_rx_loop#0@0:  ba6a9e67 acc84fe7 71a3955e 6f2c7bfa
1700366741.414727 axen_uno_rx_loop#0@0:  19ed74fc 70b4ea02 f8b324e9 670f66d4
1700366741.414728 axen_uno_rx_loop#0@0:  3ed73c00 12dad6cf 5b7a8eda 9f6b6779
1700366741.414728 axen_uno_rx_loop#0@0:  3c5a2585 8970e6d5 3010a761 d50e1212
1700366741.414728 axen_uno_rx_loop#0@0:  b27e0a9e 75db07b8 7b1092c3 5a625fea
1700366741.414728 axen_uno_rx_loop#0@0:  cdff500e 185202fb ca5c5629 582b1de6
1700366741.414728 axen_uno_rx_loop#0@0:  e59b504e 6146e59a 8e8cb57d 303b0962
1700366741.414728 axen_uno_rx_loop#0@0:  f239f8a0 3d8b0acb 51dca239 31ec9294
1700366741.414728 axen_uno_rx_loop#0@0:  5b2579ea 6ef5d6d9 ae846092 703ffec1
1700366741.414729 axen_uno_rx_loop#0@0:  10ec0d4d 97d61997 e9535d9c f707e887
1700366741.414729 axen_uno_rx_loop#0@0:  db40b4ba bfee1a94 1ff03e9c 8c8ff1d3
1700366741.414729 axen_uno_rx_loop#0@0:  445f335f 7c6074bf 179db38a 1d6f0ab1
1700366741.414729 axen_uno_rx_loop#0@0:  4924a8c5 806561f2 5f5755f2 3b69173c
1700366741.414729 axen_uno_rx_loop#0@0:  d280445a cd6a5379 ac2abc85 ff3e9eda
1700366741.414729 axen_uno_rx_loop#0@0:  b284dabc c6b1177b 24722b43 86b6daf2
1700366741.414730 axen_uno_rx_loop#0@0:  9f7093ef 69cf98b1 e448f383 9a21e03b
1700366741.414730 axen_uno_rx_loop#0@0:  a962e113 fbebb9f8 3fe1124e b3ee4eb0
1700366741.414730 axen_uno_rx_loop#0@0:  b00d003e fb077b08 ca61da5b 42356d3e
1700366741.414730 axen_uno_rx_loop#0@0:  a1d4562b 4d37686c 1789f417 98c23c8e
1700366741.414730 axen_uno_rx_loop#0@0:  71e8d342 459911bf e4d235aa 74e3312b
1700366741.414730 axen_uno_rx_loop#0@0:  d4d22c5b 4cf62df8 89906c3b 13f29ab3
1700366741.414730 axen_uno_rx_loop#0@0:  6059786e 66e816c4 36714b65 53082ccf
1700366741.414731 axen_uno_rx_loop#0@0:  9a9c4284 d3c6ab5a b3604225 a9ce255f
1700366741.414731 axen_uno_rx_loop#0@0:  0aea82f0 f0fc689e 837b712b 5b4e2c38
1700366741.414731 axen_uno_rx_loop#0@0:  bb1b2278 4cf92544 86962c00 70e66f9a
1700366741.414731 axen_uno_rx_loop#0@0:  e5da3412 f12da685 3ee42e95 7ed0653e
1700366741.414731 axen_uno_rx_loop#0@0:  9b4615ef b64c72d5 07afdaf5 f8fe0d5d
1700366741.414732 axen_uno_rx_loop#0@0:  0436e821 10abbb22 754b54f9 20f4e51b
1700366741.414732 axen_uno_rx_loop#0@0:  b929ea36 87e27710 6d5ed5d7 6f83c952
1700366741.414732 axen_uno_rx_loop#0@0:  e8b0b7c9 f43aaa1a 236497b7 5c1209b5
1700366741.414732 axen_uno_rx_loop#0@0:  80738fa6 0799ee86 93d83b29 544ff202
1700366741.414732 axen_uno_rx_loop#0@0:  b47a571c f4af0f00 d271bd7b 02f7b9c5
1700366741.414732 axen_uno_rx_loop#0@0:  3de4a322 d61129b8 59b9951b 5b8f61e5
1700366741.414733 axen_uno_rx_loop#0@0:  8a3eb341 a0ddc9b1 f8688df6 e0943798
1700366741.414733 axen_uno_rx_loop#0@0:  862f34f9 2e619ca6 08cead83 df680dc5
1700366741.414733 axen_uno_rx_loop#0@0:  d6a11694 ea335f37 30a4ac29 e604ade4
1700366741.414733 axen_uno_rx_loop#0@0:  bb273e40 16721d36 e9764012 1e10b07d
1700366741.414733 axen_uno_rx_loop#0@0:  414a5405 6f86d53d 697288e4 7de5ccbc
1700366741.414734 axen_uno_rx_loop#0@0:  8441d68b 1bc7b30b ac7173de 3c08e5d5
1700366741.414734 axen_uno_rx_loop#0@0:  ae4e24e8 a8dbfc5e b490a8aa cde79fd7
1700366741.414734 axen_uno_rx_loop#0@0:  e996dad0 c0307194 15ea7045 2234293f
1700366741.414734 axen_uno_rx_loop#0@0:  2a5d16bc 2651da88 cb50489f 70ee9329
1700366741.414734 axen_uno_rx_loop#0@0:  6a1a8134 b60bb294 8de25162 736e32d7
1700366741.414734 axen_uno_rx_loop#0@0:  6ca20975 d0f7ff3d 0e49baab e9868522
1700366741.414735 axen_uno_rx_loop#0@0:  5927d4c9 a12ba793 ccc39489 fdc6865a
1700366741.414735 axen_uno_rx_loop#0@0:  f0db951a c943a4c4 03ede0ce f00509ad
1700366741.414735 axen_uno_rx_loop#0@0:  634b1607 92b164a3 d06c2dbc 780200c8
1700366741.414735 axen_uno_rx_loop#0@0:  31dc0b23 96ba0c50 348f276e e380a69c
1700366741.414736 axen_uno_rx_loop#0@0:  a72fce8e 35612ee3 852a3010 936ce3b3
1700366741.414736 axen_uno_rx_loop#0@0:  1b262da5 c386becc 392ad7d3 2be79e80
1700366741.414736 axen_uno_rx_loop#0@0:  7c6e3240 f0335b74 b6a629f4 e5d783dd
1700366741.414736 axen_uno_rx_loop#0@0:  6c460388 b471bfab 8e5761ce 90036db6
1700366741.414736 axen_uno_rx_loop#0@0:  013bea51 039800b4 cb874d4b 6cb4a2d7
1700366741.414736 axen_uno_rx_loop#0@0:  cec655cc b9ad434e 23aa297c 675e9b88
1700366741.414737 axen_uno_rx_loop#0@0:  d026b4e0 bfeaabaf 8c03704e 891bb174
1700366741.414737 axen_uno_rx_loop#0@0:  b8830307 a24380d6 25a79861 fc694e7c
1700366741.414737 axen_uno_rx_loop#0@0:  6197102c 8a27c980 1aadc7ac 02daed17
1700366741.414737 axen_uno_rx_loop#0@0:  a1026503 6190fbd8 e9195786 805c2a4f
1700366741.414737 axen_uno_rx_loop#0@0:  59b5ece4 292e9313 c4d5f04d 2c1f8c9e
1700366741.414738 axen_uno_rx_loop#0@0:  31e631c3 3bc8a7a8 d1db03da 1662fe35
1700366741.414738 axen_uno_rx_loop#0@0:  ace05ec1 9946d9c0 578b38e8 96d31fc5
1700366741.414738 axen_uno_rx_loop#0@0:  5a486de6 fc47240c b952877d f1135a69
1700366741.414738 axen_uno_rx_loop#0@0:  30679159 18227ae1 ed42e6a7 9741b099
1700366741.414738 axen_uno_rx_loop#0@0:  c50fac75 09400219 34a159f9 d55caa10
1700366741.414739 axen_uno_rx_loop#0@0:  64b37ba4 4d8bcd3a 3380d6f1 d02d86c4
                                  0bd0                pkt #2    --> <garbage>
1700366741.414739 axen_uno_rx_loop#0@0:  0008ec05 00000080 0008ec05 00000080
                                  0be0   <  pkt_hdr #1   > <  pkt_hdr #2   >
1700366741.414739 axen_uno_rx_loop#0@0:  00000000 0400e00b 400657b9 c0a80104
                                  0bf0  <garbage><recv_hdr><--  garbage  -->

Receive buffer map of AX88179A resembles 179 map in each frame has
0xeeee header, but 179A pkt_count in recv_hdr looks like twice of 179.
179A pkt_hdr looks having new field `0x80000000'.
I'm not sure what this means.
In addition, each 179A frame doesn't contain FCS.
It's correct increasing pkt_length by 4 if chip is 179A.