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pping: Add warnings for failing to create map entry

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Send a warning notifying the user that PPing failed to create a
flow/timestamp entry due to the corresponding map being full. To avoid
sending a warning for every packet, only emit warnings every
WARN_MAP_FULL_INTERVAL (which is currently hard-coded to 1s).

Signed-off-by: Simon Sundberg <simon.sundberg@kau.se>
This commit is contained in:
Simon Sundberg
2022-02-03 15:51:22 +01:00
parent 54886c92d9
commit 2647429081
3 changed files with 68 additions and 5 deletions
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19
pping/pping.h
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@@ -14,6 +14,7 @@ typedef __u64 fixpoint64;
/* For the event_type members of rtt_event and flow_event */
#define EVENT_TYPE_FLOW 1
#define EVENT_TYPE_RTT 2
#define EVENT_TYPE_MAP_FULL 3
enum __attribute__((__packed__)) flow_event_type {
FLOW_EVENT_NONE,
@@ -37,6 +38,11 @@ enum __attribute__((__packed__)) flow_event_source {
EVENT_SOURCE_USERSPACE
};
enum __attribute__((__packed__)) pping_map {
PPING_MAP_FLOWSTATE = 0,
PPING_MAP_PACKETTS
};
struct bpf_config {
__u64 rate_limit;
fixpoint64 rtt_rate;
@@ -133,10 +139,23 @@ struct flow_event {
__u8 reserved;
};
/*
* An event indicating that a new entry could not be created the map due to the
* map being full.
*/
struct map_full_event {
__u64 event_type;
__u64 timestamp;
struct network_tuple flow;
enum pping_map map;
__u8 reserved[3];
};
union pping_event {
__u64 event_type;
struct rtt_event rtt_event;
struct flow_event flow_event;
struct map_full_event map_event;
};
/*