From 58aa94f922c1b44e0919d1814d2eab5b9e8bf945 Mon Sep 17 00:00:00 2001 From: Jesper Dangaard Brouer Date: Thu, 16 Jan 2020 16:14:46 +0100 Subject: [PATCH] devmap: Adjust tracepoint for map-less queue flush MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Toke Høiland-Jørgensen Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/157918768613.1458396.9165902403373826572.stgit@toke.dk --- 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(-) diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h index b680973687b4..b95d65e8c628 100644 --- 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 , but not xdp_priv.h */ diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index d5311009953f..de630f980282 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -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; diff --git a/samples/bpf/xdp_monitor_kern.c b/samples/bpf/xdp_monitor_kern.c index ad10fe700d7d..39458a44472e 100644 --- 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_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") -- 2.34.1