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| author | Dongli Zhang <dongli.zhang@oracle.com> | 2022-03-04 06:55:05 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-03-06 11:04:01 +0000 |
| commit | 736f16de75f9bb32d76f652cb66f04d1bc685057 (patch) | |
| tree | 33f74ce9470d9e00c157e64a1c2e35d2cc5b0fe8 /include | |
| parent | 925a24213b5cc80fcef8858e6dc1f97ea2b17afb (diff) | |
| download | linux-736f16de75f9bb32d76f652cb66f04d1bc685057.tar.gz linux-736f16de75f9bb32d76f652cb66f04d1bc685057.tar.bz2 linux-736f16de75f9bb32d76f652cb66f04d1bc685057.zip | |
net: tap: track dropped skb via kfree_skb_reason()
The TAP can be used as vhost-net backend. E.g., the tap_handle_frame() is
the interface to forward the skb from TAP to vhost-net/virtio-net.
However, there are many "goto drop" in the TAP driver. Therefore, the
kfree_skb_reason() is involved at each "goto drop" to help userspace
ftrace/ebpf to track the reason for the loss of packets.
The below reasons are introduced:
- SKB_DROP_REASON_SKB_CSUM
- SKB_DROP_REASON_SKB_GSO_SEG
- SKB_DROP_REASON_SKB_UCOPY_FAULT
- SKB_DROP_REASON_DEV_HDR
- SKB_DROP_REASON_FULL_RING
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/skbuff.h | 13 | ||||
| -rw-r--r-- | include/trace/events/skb.h | 5 |
2 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 2be263184d1e..67cfff4065b6 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -412,6 +412,19 @@ enum skb_drop_reason { * this means that L3 protocol is * not supported */ + SKB_DROP_REASON_SKB_CSUM, /* sk_buff checksum computation + * error + */ + SKB_DROP_REASON_SKB_GSO_SEG, /* gso segmentation error */ + SKB_DROP_REASON_SKB_UCOPY_FAULT, /* failed to copy data from + * user space, e.g., via + * zerocopy_sg_from_iter() + * or skb_orphan_frags_rx() + */ + SKB_DROP_REASON_DEV_HDR, /* device driver specific + * header/metadata is invalid + */ + SKB_DROP_REASON_FULL_RING, /* ring buffer is full */ SKB_DROP_REASON_MAX, }; diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h index c0769d943f8e..240e7e7591fc 100644 --- a/include/trace/events/skb.h +++ b/include/trace/events/skb.h @@ -51,6 +51,11 @@ EM(SKB_DROP_REASON_XDP, XDP) \ EM(SKB_DROP_REASON_TC_INGRESS, TC_INGRESS) \ EM(SKB_DROP_REASON_PTYPE_ABSENT, PTYPE_ABSENT) \ + EM(SKB_DROP_REASON_SKB_CSUM, SKB_CSUM) \ + EM(SKB_DROP_REASON_SKB_GSO_SEG, SKB_GSO_SEG) \ + EM(SKB_DROP_REASON_SKB_UCOPY_FAULT, SKB_UCOPY_FAULT) \ + EM(SKB_DROP_REASON_DEV_HDR, DEV_HDR) \ + EM(SKB_DROP_REASON_FULL_RING, FULL_RING) \ EMe(SKB_DROP_REASON_MAX, MAX) #undef EM |