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iplink_can: print brp and dbrp bittiming variables 

Report the value of the bit-rate prescaler (brp) for both the nominal
and the data bittiming.

Currently, only the constant brp values (brp_{min,max,inc}) are being
reported. Also, brp is the only member of struct can_bittiming not
being reported.

Noticeably, brp could be calculated by hand from the other bittiming
parameters with below formula:

        brp = clock * tq / 1000000000

with clock in hertz and tq in nano second (thus the need of a 1
billion factor to convert it back to second).

But because above formula is not so trivial to remember and is
subjected to rounding errors, it makes sense to directly output
{d,}bpr.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: David Ahern <dsahern@kernel.org>
This commit is contained in:
Vincent Mailhol 2021-11-04 01:44:27 +09:00 committed by David Ahern
parent 67f3c7a5cc
commit 0f7bb8d842
1 changed files with 2 additions and 0 deletions
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2
ip/iplink_can.c
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@ -344,6 +344,7 @@ static void can_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
print_uint(PRINT_ANY, "phase_seg2", " phase-seg2 %u",
bt->phase_seg2);
print_uint(PRINT_ANY, "sjw", " sjw %u", bt->sjw);
print_uint(PRINT_ANY, "brp", " brp %u", bt->brp);
close_json_object();
}
@ -419,6 +420,7 @@ static void can_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
print_uint(PRINT_ANY, "phase_seg2", " dphase-seg2 %u",
dbt->phase_seg2);
print_uint(PRINT_ANY, "sjw", " dsjw %u", dbt->sjw);
print_uint(PRINT_ANY, "brp", " dbrp %u", dbt->brp);
close_json_object();
}