[P4] SOS - segfault Encap + Decap

[Sándor Laki]

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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