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ca30707dee
linux/net
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Ido Schimmel ca30707dee drop_monitor: Add packet alert mode 
So far drop monitor supported only one alert mode in which a summary of
locations in which packets were recently dropped was sent to user space.

This alert mode is sufficient in order to understand that packets were
dropped, but lacks information to perform a more detailed analysis.

Add a new alert mode in which the dropped packet itself is passed to
user space along with metadata: The drop location (as program counter
and resolved symbol), ingress netdevice and drop timestamp. More
metadata can be added in the future.

To avoid performing expensive operations in the context in which
kfree_skb() is invoked (can be hard IRQ), the dropped skb is cloned and
queued on per-CPU skb drop list. Then, in process context the netlink
message is allocated, prepared and finally sent to user space.

The per-CPU skb drop list is limited to 1000 skbs to prevent exhausting
the system's memory. Subsequent patches will make this limit
configurable and also add a counter that indicates how many skbs were
tail dropped.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-08-11 10:53:30 -07:00
..
6lowpan 6lowpan: no need to check return value of debugfs_create functions 2019-07-06 12:50:01 +02:00
9p 9p pull request for inclusion in 5.13 2019-07-12 17:31:19 -07:00
802 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
8021q Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-22 08:59:24 -04:00
appletalk net: Use skb_frag_off accessors 2019-07-30 14:21:32 -07:00
atm
ax25 ax25: fix inconsistent lock state in ax25_destroy_timer 2019-06-16 14:22:37 -07:00
batman-adv batman-adv: BATMAN_V: aggregate OGMv2 packets 2019-08-04 22:22:00 +02:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
bpf
bpfilter Kbuild updates for v5.3 2019-07-12 16:03:16 -07:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
caif
can Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
ceph Lots of exciting things this time! 2019-07-18 11:05:25 -07:00
core drop_monitor: Add packet alert mode 2019-08-11 10:53:30 -07:00
dcb
dccp proc/sysctl: add shared variables for range check 2019-07-18 17:08:07 -07:00
decnet
dns_resolver Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
dsa Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
ethernet
hsr hsr: switch ->dellink() to ->ndo_uninit() 2019-07-11 14:37:45 -07:00
ieee802154 inet: fix various use-after-free in defrags units 2019-06-19 11:37:47 -04:00
ife
ipv4 tcp: add new tcp_mtu_probe_floor sysctl 2019-08-09 13:03:30 -07:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
iucv net/af_iucv: mark expected switch fall-throughs 2019-07-29 10:26:14 -07:00
kcm net: Use skb_frag_off accessors 2019-07-30 14:21:32 -07:00
key Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-07-08 19:48:57 -07:00
l2tp compat_ioctl: pppoe: fix PPPOEIOCSFWD handling 2019-07-30 14:42:13 -07:00
l3mdev ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF 2019-06-23 13:24:17 -07:00
lapb Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-17 20:20:36 -07:00
llc
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
mac802154
mpls proc/sysctl: add shared variables for range check 2019-07-18 17:08:07 -07:00
ncsi
netfilter netfilter: nf_tables_offload: support indr block call 2019-08-08 18:44:30 -07:00
netlabel
netlink net: remove empty netlink_tap_exit_net 2019-06-14 19:50:33 -07:00
netrom netrom: hold sock when setting skb->destructor 2019-07-24 15:49:05 -07:00
nfc NFC: fix attrs checks in netlink interface 2019-07-29 08:56:26 -07:00
nsh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-27 21:06:39 -07:00
phonet
psample treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
qrtr
rds net: rds: Fix possible null-pointer dereferences in rds_rdma_cm_event_handler_cmn() 2019-07-27 13:58:12 -07:00
rfkill treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
rose
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
sched taprio: remove unused variable 'entry_list_policy' 2019-08-09 13:41:24 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
smc net/smc: avoid fallback in case of non-blocking connect 2019-08-05 13:24:37 -07:00
strparser Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-22 08:59:24 -04:00
sunrpc Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
switchdev
tipc tipc: add loopback device tracking 2019-08-08 22:11:39 -07:00
tls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
unix
vmw_vsock Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
wimax wimax: no need to check return value of debugfs_create functions 2019-08-10 15:25:47 -07:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 18:44:57 -07:00
x25
xdp xdp: fix potential deadlock on socket mutex 2019-07-12 15:02:21 +02:00
xfrm net: Use skb_frag_off accessors 2019-07-30 14:21:32 -07:00
compat.c
Kconfig net: ipv4: move tcp_fastopen server side code to SipHash library 2019-06-17 13:56:26 -07:00
Makefile
socket.c Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
sysctl_net.c