From: Menglong Dong <imagedong@tencent.com>
In this series patch, the interface kfree_skb_with_reason() is
introduced(), which is used to collect skb drop reason, and pass
it to 'kfree_skb' tracepoint. Therefor, 'drop_monitor' or eBPF is
able to monitor abnormal skb with detail reason.
In fact, this series patches are out of the intelligence of David
and Steve, I'm just a truck man :/
Previous discussion is here:
https://lore.kernel.org/netdev/20211118105752.1d46e990@gandalf.local.home/
https://lore.kernel.org/netdev/67b36bd8-2477-88ac-83a0-35a1eeaf40c9@gmail.com/
In the first patch, kfree_skb_with_reason() is introduced and
the 'reason' field is added to 'kfree_skb' tracepoint. In the
second patch, 'kfree_skb()' in replaced with 'kfree_skb_with_reason()'
in tcp_v4_rcv(). In the third patch, 'kfree_skb_with_reason()' is
used in __udp4_lib_rcv().
Changes since v3:
- fix some code style problems in skb.h
Changes since v2:
- rename kfree_skb_with_reason() to kfree_skb_reason()
- make kfree_skb() static inline, as Jakub suggested
Changes since v1:
- rename some drop reason, as David suggested
- add the third patch
Menglong Dong (3):
net: bpf: handle return value of
BPF_CGROUP_RUN_PROG_INET{4,6}_POST_BIND()
bpf: selftests: use C99 initializers in test_sock.c
bpf: selftests: add bind retry for post_bind{4, 6}
include/net/sock.h | 1 +
net/ipv4/af_inet.c | 2 +
net/ipv4/ping.c | 1 +
net/ipv4/tcp_ipv4.c | 1 +
net/ipv4/udp.c | 1 +
net/ipv6/af_inet6.c | 2 +
net/ipv6/ping.c | 1 +
net/ipv6/tcp_ipv6.c | 1 +
net/ipv6/udp.c | 1 +
tools/testing/selftests/bpf/test_sock.c | 370 ++++++++++++++----------
10 files changed, 233 insertions(+), 148 deletions(-)
--
2.27.0