From: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Thu, 16 Jan 2020 16:14:46 +0100
Subject: devmap: Adjust tracepoint for map-less queue flush
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Patch-mainline: v5.6-rc1
Git-commit: 58aa94f922c1b44e0919d1814d2eab5b9e8bf945
References: bsc#1177028
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
Acked-by: Gary Lin <glin@suse.com>
---
include/trace/events/xdp.h | 29 ++++++++++++-----------------
kernel/bpf/devmap.c | 2 +-
samples/bpf/xdp_monitor_kern.c | 8 +++-----
3 files changed, 16 insertions(+), 23 deletions(-)
--- a/include/trace/events/xdp.h
+++ b/include/trace/events/xdp.h
@@ -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 */
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -340,7 +340,7 @@ static int bq_xmit_all(struct xdp_dev_bu
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;
--- a/samples/bpf/xdp_monitor_kern.c
+++ b/samples/bpf/xdp_monitor_kern.c
@@ -222,14 +222,12 @@ struct bpf_map_def SEC("maps") devmap_xm
*/
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")