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devmap: Adjust tracepoint for map-less queue flush 

Now that we don't have a reference to a devmap when flushing the device
bulk queue, let's change the the devmap_xmit tracepoint to remote the
map_id and map_index fields entirely. Rearrange the fields so 'drops' and
'sent' stay in the same position in the tracepoint struct, to make it
possible for the xdp_monitor utility to read both the old and the new
format.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/157918768613.1458396.9165902403373826572.stgit@toke.dk
This commit is contained in:
Jesper Dangaard Brouer 2020-01-16 16:14:46 +01:00 committed by Alexei Starovoitov
parent 1d233886dd
commit 58aa94f922
3 changed files with 16 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
include/trace/events/xdp.h
View File

@ -246,43 +246,38 @@ TRACE_EVENT(xdp_cpumap_enqueue,
TRACE_EVENT(xdp_devmap_xmit,
TP_PROTO(const struct bpf_map *map, u32 map_index,
int sent, int drops,
const struct net_device *from_dev,
const struct net_device *to_dev, int err),
TP_PROTO(const struct net_device *from_dev,
const struct net_device *to_dev,
int sent, int drops, int err),
TP_ARGS(map, map_index, sent, drops, from_dev, to_dev, err),
TP_ARGS(from_dev, to_dev, sent, drops, err),
TP_STRUCT__entry(
__field(int, map_id)
__field(int, from_ifindex)
__field(u32, act)
__field(u32, map_index)
__field(int, to_ifindex)
__field(int, drops)
__field(int, sent)
__field(int, from_ifindex)
__field(int, to_ifindex)
__field(int, err)
),
TP_fast_assign(
__entry->map_id = map ? map->id : 0;
__entry->from_ifindex = from_dev->ifindex;
__entry->act = XDP_REDIRECT;
__entry->map_index = map_index;
__entry->to_ifindex = to_dev->ifindex;
__entry->drops = drops;
__entry->sent = sent;
__entry->from_ifindex = from_dev->ifindex;
__entry->to_ifindex = to_dev->ifindex;
__entry->err = err;
),
TP_printk("ndo_xdp_xmit"
" map_id=%d map_index=%d action=%s"
" from_ifindex=%d to_ifindex=%d action=%s"
" sent=%d drops=%d"
" from_ifindex=%d to_ifindex=%d err=%d",
__entry->map_id, __entry->map_index,
" err=%d",
__entry->from_ifindex, __entry->to_ifindex,
__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
__entry->sent, __entry->drops,
__entry->from_ifindex, __entry->to_ifindex, __entry->err)
__entry->err)
);
/* Expect users already include <net/xdp.h>, but not xdp_priv.h */

2
kernel/bpf/devmap.c
View File

@ -340,7 +340,7 @@ static int bq_xmit_all(struct xdp_dev_bulk_queue *bq, u32 flags)
out:
bq->count = 0;
trace_xdp_devmap_xmit(NULL, 0, sent, drops, bq->dev_rx, dev, err);
trace_xdp_devmap_xmit(bq->dev_rx, dev, sent, drops, err);
bq->dev_rx = NULL;
__list_del_clearprev(&bq->flush_node);
return 0;

8
samples/bpf/xdp_monitor_kern.c
View File

@ -222,14 +222,12 @@ struct bpf_map_def SEC("maps") devmap_xmit_cnt = {
*/
struct devmap_xmit_ctx {
u64 __pad; // First 8 bytes are not accessible by bpf code
int map_id; // offset:8; size:4; signed:1;
int from_ifindex; // offset:8; size:4; signed:1;
u32 act; // offset:12; size:4; signed:0;
u32 map_index; // offset:16; size:4; signed:0;
int to_ifindex; // offset:16; size:4; signed:1;
int drops; // offset:20; size:4; signed:1;
int sent; // offset:24; size:4; signed:1;
int from_ifindex; // offset:28; size:4; signed:1;
int to_ifindex; // offset:32; size:4; signed:1;
int err; // offset:36; size:4; signed:1;
int err; // offset:28; size:4; signed:1;
};
SEC("tracepoint/xdp/xdp_devmap_xmit")