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tty: n_gsm: add debug bit for user payload 

A debug bit to output a complete transmission dump exists. Sometimes only
the user frames are relevant. Add an additional bit which limits the
transmission dump output to user data frames if set.

Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220831073800.7459-6-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Starke 2022-08-31 09:38:00 +02:00 committed by Greg Kroah-Hartman
parent c07da737af
commit c22d054f1e
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/n_gsm.c
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@ -69,6 +69,7 @@ module_param(debug, int, 0600);
#define DBG_DATA BIT(2) /* Data transmission details. */
#define DBG_ERRORS BIT(3) /* Details for fail conditions. */
#define DBG_TTY BIT(4) /* Transmission statistics for DLCI TTYs. */
#define DBG_PAYLOAD BIT(5) /* Limits DBG_DUMP to payload frames. */
/* Defaults: these are from the specification */
@ -598,6 +599,10 @@ static void gsm_print_packet(const char *hdr, int addr, int cr,
{
if (!(debug & DBG_DUMP))
return;
/* Only show user payload frames if debug & DBG_PAYLOAD */
if (!(debug & DBG_PAYLOAD) && addr != 0)
if ((control & ~PF) == UI || (control & ~PF) == UIH)
return;
pr_info("%s %d) %c: ", hdr, addr, "RC"[cr]);