[P4] SOS - segfault Encap + Decap

[Sándor Laki]

Parser probléma volt. Egy résznél az inner_ip parsolás is ki lett 
kommentezve. Köszi Máté!

Mindjárt nézem, hogy milyen csomagokat kapunk vissza...

Üdv.

Sanyi


2018.05.31. 0:02 keltezéssel, Sándor Laki írta:
> Nah, a downlink irány megy, elvben az encapsulation-nel, majd holnap 
> ellenőrzöm. Az uplink irányban viszont az a hiba még megoldásra vár...
>
> Üdv.
>
> Sanyi
>
>
> 2018.05.30. 23:34 keltezéssel, Sándor Laki írta:
>> Hi,
>>
>> decapsulation segfaultot dob - a lenti első memcpy sornál kapjuk:
>>
>> void action_code_gtp_decapsulate_0(packet_descriptor_t* pd, 
>> lookup_table_t** tables) { // actions at 41
>>     uint32_t value32, res32, mask32; // actions at 42
>>     (void)value32; (void)res32; (void)mask32; // actions at 43
>>     control_locals_MyIngress_t* control_locals = 
>> (control_locals_MyIngress_t*) pd->control_locals; // actions at 44
>> // TODO make it work properly for non-byte-aligned fields // codegen at 256
>> memcpy(pd->headers[header_instance_ipv4].pointer, 
>> pd->headers[header_instance_inner_ipv4].pointer, 
>> (field_instance_bit_width[header_instance_ipv4]+7)/8); // codegen at 257
>>
>> a debugger alapján:
>>
>> #0  0x00000000004389e8 in memcpy (__len=6, __src=0x0, 
>> __dest=0x7fffda81410e)
>>     at /usr/include/x86_64-linux-gnu/bits/string3.h:53
>> #1  action_code_gtp_decapsulate_0 (pd=pd at entry=0x7fffffffdcd0,
>>     tables=tables at entry=0x858580 <lcore_conf+9600>)
>>     at 
>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/actions.c:93
>> #2  0x000000000043859b in ue_selector_apply (
>>     tables=0x858580 <lcore_conf+9600>, pd=0x7fffffffdcd0)
>>     at 
>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/dataplane.c:67
>>
>>
>> Encapsulation hasonlan segfaultol, de itt a udp fejléces memcpy 
>> csinálja. Ez lehet, hogy kiküszöbölhető pl. az inner_udp eltűntetésével.
>>
>> void action_code_gtp_encapsulate_0(packet_descriptor_t* pd, 
>> lookup_table_t** tables, struct action_gtp_encapsulate_0_params 
>> parameters) { // actions at 41
>>     uint32_t value32, res32, mask32; // actions at 42
>>     (void)value32; (void)res32; (void)mask32; // actions at 43
>>     control_locals_MyIngress_t* control_locals = 
>> (control_locals_MyIngress_t*) pd->control_locals; // actions at 44
>> // setValid called on <Member>[#-2433][expr, header_ref, member, 
>> type] // codegen at 305
>> debug("Setting header instance inner_ipv4 as valid"); // codegen at 331
>> pd->headers[header_instance_inner_ipv4].pointer = 
>> (pd->header_tmp_storage + 
>> header_instance_byte_width_summed[header_instance_inner_ipv4]); // 
>> codegen at 332
>> // TODO initialise header instance contents? // codegen at 333
>> // TODO make it work properly for non-byte-aligned fields // codegen at 256
>> memcpy(pd->headers[header_instance_inner_ipv4].pointer, 
>> pd->headers[header_instance_ipv4].pointer, 
>> (field_instance_bit_width[header_instance_inner_ipv4]+7)/8); // 
>> codegen at 257
>> // TODO make it work properly for non-byte-aligned fields // codegen at 256
>> memcpy(pd->headers[header_instance_inner_udp].pointer, 
>> pd->headers[header_instance_udp].pointer, 
>> (field_instance_bit_width[header_instance_inner_udp]+7)/8);
>>
>> debugger:
>>
>> Thread 1 "vsmgw-no-typede" received signal SIGSEGV, Segmentation fault.
>> action_code_gtp_encapsulate_0 (pd=pd at entry=0x7fffffffdcd0,
>>     tables=tables at entry=0x858580 <lcore_conf+9600>, parameters=...)
>>     at 
>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/actions.c:38
>> 38 memcpy(pd->headers[header_instance_inner_udp].pointer, 
>> pd->headers[header_instance_udp].pointer, 
>> (field_instance_bit_width[header_instance_inner_udp]+7)/8); // 
>> codegen at 257
>> (gdb) bt
>> #0  action_code_gtp_encapsulate_0 (pd=pd at entry=0x7fffffffdcd0,
>>     tables=tables at entry=0x858580 <lcore_conf+9600>, parameters=...)
>>     at 
>> /home/p4/demo/t4p4s-16/build/vsmgw-no-typedef//../src_hardware_indep/actions.c:38
>>
>> Üdv.
>> Sanyi
>>
>

-- 
Sándor Laki, PhD
Assistant professor
Department of Information Systems
Eötvös Loránd University
Pázmány Péter stny. 1/C
H-1117, Budapest, Hungary
Room 2.506
Web: http://lakis.web.elte.hu
Phone: +36 1 372 2869 / 8477
Cell: +36 70 374 2646


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