Hello,
I'm getting loads of "CRC error in an AAL5 frame" message in my system log
- sometimes one every few minutes. Applying this patch made no difference.
Everything seems to be working OK, so should I just ignore these errors, or
is there someone looking for help to debug this problem? I would be happy
to provide extra diagnostic output if anyone wanted it.
John
At 19:42 10/03/03 +0100, you wrote:
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>
>Edouard Gomez ([EMAIL PROTECTED]) wrote:
> > I'll do that tonight.
>
>Quick hack that could be the start of a smarter junk byte skipping.
>
>My approach is now to look for the next cell beginning in a [0..ATM cell si=
>ze]
>range. To achieve that, i look for a vpi, vci matching the ones we
>expect and finally the HEC (header CRC) just to be sure.=20
>
>--=20
>Edouard Gomez
>
>-- Attached file included as plaintext by Listar --
>
>Index: atm.c
>===================================================================
>RCS file: /cvsroot/speedtouch/speedtouch/src/atm.c,v
>retrieving revision 1.8
>diff -u -r1.8 atm.c
>--- atm.c 28 Dec 2002 13:42:21 -0000 1.8
>+++ atm.c 10 Mar 2003 18:36:02 -0000
>@@ -302,13 +302,29 @@
> src = atm_cells;
> dst = aal5_frame + *cur_pos;
>
>- /* There's sometimes junk bytes at the beginning of
>atm_cells_buffer */
>+ /* There's sometimes junk bytes in atm_cells_buffer */
> tmp = length % ATM_CELL_TOTAL_SIZE;
>
>- /* Skip the junk bytes at the beginning */
>- if(!tmp) {
>- src += tmp;
>- length -= tmp;
>+ /* We skip junk bytes until the next ATM cell */
>+ if(tmp) {
>+
>+ int i;
>+
>+ /*
>+ * We should find a cell's beginning before an ATM cell size
>+ * byte range from current position
>+ */
>+ for(i=0; i<ATM_CELL_TOTAL_SIZE; i++) {
>+
>+ /* First we try finding VPI/VCI */
>+ if(atm_header_get_vpi(src + i) == vpi &&
>+ atm_header_get_vci(src + i) == vci &&
>+ atm_calc_hec(src + i) == *(src + i + 4)) {
>+ src += i;
>+ length -= i;
>+ break;
>+ }
>+ }
> }
>
>
>Index: crc.c
>===================================================================
>RCS file: /cvsroot/speedtouch/speedtouch/src/crc.c,v
>retrieving revision 1.4
>diff -u -r1.4 crc.c
>--- crc.c 28 Dec 2002 13:42:21 -0000 1.4
>+++ crc.c 10 Mar 2003 18:36:03 -0000
>@@ -114,7 +114,6 @@
> * Precomputed ATM CRC8 lookup table
>
>******************************************************************************/
>
>-#ifdef DEBUG
> unsigned char hec_table[256]=
> {
>
>@@ -152,7 +151,6 @@
> 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3
>
> };
>-#endif
>
>
>/******************************************************************************
> * Functions
>@@ -185,7 +183,6 @@
>
> }
>
>-#ifdef DEBUG
> unsigned char atm_calc_hec(unsigned char *header)
> {
>
>@@ -199,6 +196,5 @@
> return(hec^ATM_HEADER_COSET_LEADER);
>
> }
>-#endif
>
> #endif
>Index: crc.h
>===================================================================
>RCS file: /cvsroot/speedtouch/speedtouch/src/crc.h,v
>retrieving revision 1.4
>diff -u -r1.4 crc.h
>--- crc.h 28 Dec 2002 13:42:21 -0000 1.4
>+++ crc.h 10 Mar 2003 18:36:03 -0000
>@@ -40,8 +40,6 @@
>
>******************************************************************************/
>
> extern unsigned int aal5_calc_crc(unsigned char *mem, int len, unsigned
> int initial);
>-#ifdef DEBUG
> extern unsigned char atm_calc_hec(unsigned char *header);
>-#endif
>
> #endif
>
>
>-- Attached file included as plaintext by Listar --
>
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>qPkehSiPd/K8y6oVhgLeo9M=
>=5xLY
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>
>
>Liste de diffusion modem ALCATEL SpeedTouch USB
>Pour se désinscrire : mailto:[EMAIL PROTECTED]
>
>
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