Petr Machata d47230a348 net: bridge: Add a tracepoint for MDB overflows
The following patch will add two more maximum MDB allowances to the global
one, mcast_hash_max, that exists today. In all these cases, attempts to add
MDB entries above the configured maximums through netlink, fail noisily and
obviously. Such visibility is missing when adding entries through the
control plane traffic, by IGMP or MLD packets.

To improve visibility in those cases, add a trace point that reports the
violation, including the relevant netdevice (be it a slave or the bridge
itself), and the MDB entry parameters:

	# perf record -e bridge:br_mdb_full &
	# [...]
	# perf script | cut -d: -f4-
	 dev v2 af 2 src ::ffff:0.0.0.0 grp ::ffff:239.1.1.112/00:00:00:00:00:00 vid 0
	 dev v2 af 10 src :: grp ff0e::112/00:00:00:00:00:00 vid 0
	 dev v2 af 2 src ::ffff:0.0.0.0 grp ::ffff:239.1.1.112/00:00:00:00:00:00 vid 10
	 dev v2 af 10 src 2001:db8:1::1 grp ff0e::1/00:00:00:00:00:00 vid 10
	 dev v2 af 2 src ::ffff:192.0.2.1 grp ::ffff:239.1.1.1/00:00:00:00:00:00 vid 10

CC: Steven Rostedt <rostedt@goodmis.org>
CC: linux-trace-kernel@vger.kernel.org
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-02-06 08:48:25 +00:00

188 lines
4.7 KiB
C

#undef TRACE_SYSTEM
#define TRACE_SYSTEM bridge
#if !defined(_TRACE_BRIDGE_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_BRIDGE_H
#include <linux/netdevice.h>
#include <linux/tracepoint.h>
#include "../../../net/bridge/br_private.h"
TRACE_EVENT(br_fdb_add,
TP_PROTO(struct ndmsg *ndm, struct net_device *dev,
const unsigned char *addr, u16 vid, u16 nlh_flags),
TP_ARGS(ndm, dev, addr, vid, nlh_flags),
TP_STRUCT__entry(
__field(u8, ndm_flags)
__string(dev, dev->name)
__array(unsigned char, addr, ETH_ALEN)
__field(u16, vid)
__field(u16, nlh_flags)
),
TP_fast_assign(
__assign_str(dev, dev->name);
memcpy(__entry->addr, addr, ETH_ALEN);
__entry->vid = vid;
__entry->nlh_flags = nlh_flags;
__entry->ndm_flags = ndm->ndm_flags;
),
TP_printk("dev %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u nlh_flags %04x ndm_flags %02x",
__get_str(dev), __entry->addr[0], __entry->addr[1],
__entry->addr[2], __entry->addr[3], __entry->addr[4],
__entry->addr[5], __entry->vid,
__entry->nlh_flags, __entry->ndm_flags)
);
TRACE_EVENT(br_fdb_external_learn_add,
TP_PROTO(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid),
TP_ARGS(br, p, addr, vid),
TP_STRUCT__entry(
__string(br_dev, br->dev->name)
__string(dev, p ? p->dev->name : "null")
__array(unsigned char, addr, ETH_ALEN)
__field(u16, vid)
),
TP_fast_assign(
__assign_str(br_dev, br->dev->name);
__assign_str(dev, p ? p->dev->name : "null");
memcpy(__entry->addr, addr, ETH_ALEN);
__entry->vid = vid;
),
TP_printk("br_dev %s port %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u",
__get_str(br_dev), __get_str(dev), __entry->addr[0],
__entry->addr[1], __entry->addr[2], __entry->addr[3],
__entry->addr[4], __entry->addr[5], __entry->vid)
);
TRACE_EVENT(fdb_delete,
TP_PROTO(struct net_bridge *br, struct net_bridge_fdb_entry *f),
TP_ARGS(br, f),
TP_STRUCT__entry(
__string(br_dev, br->dev->name)
__string(dev, f->dst ? f->dst->dev->name : "null")
__array(unsigned char, addr, ETH_ALEN)
__field(u16, vid)
),
TP_fast_assign(
__assign_str(br_dev, br->dev->name);
__assign_str(dev, f->dst ? f->dst->dev->name : "null");
memcpy(__entry->addr, f->key.addr.addr, ETH_ALEN);
__entry->vid = f->key.vlan_id;
),
TP_printk("br_dev %s dev %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u",
__get_str(br_dev), __get_str(dev), __entry->addr[0],
__entry->addr[1], __entry->addr[2], __entry->addr[3],
__entry->addr[4], __entry->addr[5], __entry->vid)
);
TRACE_EVENT(br_fdb_update,
TP_PROTO(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid, unsigned long flags),
TP_ARGS(br, source, addr, vid, flags),
TP_STRUCT__entry(
__string(br_dev, br->dev->name)
__string(dev, source->dev->name)
__array(unsigned char, addr, ETH_ALEN)
__field(u16, vid)
__field(unsigned long, flags)
),
TP_fast_assign(
__assign_str(br_dev, br->dev->name);
__assign_str(dev, source->dev->name);
memcpy(__entry->addr, addr, ETH_ALEN);
__entry->vid = vid;
__entry->flags = flags;
),
TP_printk("br_dev %s source %s addr %02x:%02x:%02x:%02x:%02x:%02x vid %u flags 0x%lx",
__get_str(br_dev), __get_str(dev), __entry->addr[0],
__entry->addr[1], __entry->addr[2], __entry->addr[3],
__entry->addr[4], __entry->addr[5], __entry->vid,
__entry->flags)
);
TRACE_EVENT(br_mdb_full,
TP_PROTO(const struct net_device *dev,
const struct br_ip *group),
TP_ARGS(dev, group),
TP_STRUCT__entry(
__string(dev, dev->name)
__field(int, af)
__field(u16, vid)
__array(__u8, src, 16)
__array(__u8, grp, 16)
__array(__u8, grpmac, ETH_ALEN) /* For af == 0. */
),
TP_fast_assign(
struct in6_addr *in6;
__assign_str(dev, dev->name);
__entry->vid = group->vid;
if (!group->proto) {
__entry->af = 0;
memset(__entry->src, 0, sizeof(__entry->src));
memset(__entry->grp, 0, sizeof(__entry->grp));
memcpy(__entry->grpmac, group->dst.mac_addr, ETH_ALEN);
} else if (group->proto == htons(ETH_P_IP)) {
__entry->af = AF_INET;
in6 = (struct in6_addr *)__entry->src;
ipv6_addr_set_v4mapped(group->src.ip4, in6);
in6 = (struct in6_addr *)__entry->grp;
ipv6_addr_set_v4mapped(group->dst.ip4, in6);
memset(__entry->grpmac, 0, ETH_ALEN);
#if IS_ENABLED(CONFIG_IPV6)
} else {
__entry->af = AF_INET6;
in6 = (struct in6_addr *)__entry->src;
*in6 = group->src.ip6;
in6 = (struct in6_addr *)__entry->grp;
*in6 = group->dst.ip6;
memset(__entry->grpmac, 0, ETH_ALEN);
#endif
}
),
TP_printk("dev %s af %u src %pI6c grp %pI6c/%pM vid %u",
__get_str(dev), __entry->af, __entry->src, __entry->grp,
__entry->grpmac, __entry->vid)
);
#endif /* _TRACE_BRIDGE_H */
/* This part must be outside protection */
#include <trace/define_trace.h>