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ipv6, trace: fix tos reporting on fib6_table_lookup 

flowi6_tos of struct flowi6 is unused in IPv6, therefore dumping tos on
that tracepoint will also give incorrect information wrt traffic class.

If we want to fix it, we need to extract it via ip6_tclass(flp->flowlabel).
While for the same test case I get a count of 0 non-zero tos values before
the change, they now start to show up after the change:

  # ./perf record -e fib6:fib6_table_lookup -a sleep 10
  # ./perf script | grep -v "tos 0" | wc -l
  60

Since there's no user in the kernel tree anymore of flowi6_tos, remove the
define to avoid any future confusion on this.

Fixes: b811580d91 ("net: IPv6 fib lookup tracepoint")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Daniel Borkmann 2016-03-18 18:37:59 +01:00 committed by David S. Miller
parent 95caf6f71a
commit 69716a2b51
2 changed files with 2 additions and 2 deletions
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2
include/net/flow.h
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@ -127,7 +127,6 @@ struct flowi6 {
#define flowi6_oif __fl_common.flowic_oif
#define flowi6_iif __fl_common.flowic_iif
#define flowi6_mark __fl_common.flowic_mark
#define flowi6_tos __fl_common.flowic_tos
#define flowi6_scope __fl_common.flowic_scope
#define flowi6_proto __fl_common.flowic_proto
#define flowi6_flags __fl_common.flowic_flags
@ -135,6 +134,7 @@ struct flowi6 {
#define flowi6_tun_key __fl_common.flowic_tun_key
struct in6_addr daddr;
struct in6_addr saddr;
/* Note: flowi6_tos is encoded in flowlabel, too. */
__be32 flowlabel;
union flowi_uli uli;
#define fl6_sport uli.ports.sport

2
include/trace/events/fib6.h
View File

@ -37,7 +37,7 @@ TRACE_EVENT(fib6_table_lookup,
__entry->tb_id = tb_id;
__entry->oif = flp->flowi6_oif;
__entry->iif = flp->flowi6_iif;
__entry->tos = flp->flowi6_tos;
__entry->tos = ip6_tclass(flp->flowlabel);
__entry->scope = flp->flowi6_scope;
__entry->flags = flp->flowi6_flags;