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Willem de Bruijn 09c2d251b7 net-timestamp: add key to disambiguate concurrent datagrams 
Datagrams timestamped on transmission can coexist in the kernel stack
and be reordered in packet scheduling. When reading looped datagrams
from the socket error queue it is not always possible to unique
correlate looped data with original send() call (for application
level retransmits). Even if possible, it may be expensive and complex,
requiring packet inspection.

Introduce a data-independent ID mechanism to associate timestamps with
send calls. Pass an ID alongside the timestamp in field ee_data of
sock_extended_err.

The ID is a simple 32 bit unsigned int that is associated with the
socket and incremented on each send() call for which software tx
timestamp generation is enabled.

The feature is enabled only if SOF_TIMESTAMPING_OPT_ID is set, to
avoid changing ee_data for existing applications that expect it 0.
The counter is reset each time the flag is reenabled. Reenabling
does not change the ID of already submitted data. It is possible
to receive out of order IDs if the timestamp stream is not quiesced
first.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-05 16:35:54 -07:00
..
6lowpan Merge tag 'master-2014-07-31' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-08-05 13:18:20 -07:00
9p 9P: remove unnecessary break after return 2014-07-15 16:27:00 -07:00
802 net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
8021q vlan: fail early when creating netdev named config 2014-07-29 11:43:50 -07:00
appletalk Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-07-16 14:09:34 -07:00
atm net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
ax25 net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-07-22 00:44:59 -07:00
bluetooth Merge tag 'master-2014-07-31' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-08-05 13:18:20 -07:00
bridge bridge: remove a useless comment 2014-08-04 12:46:51 -07:00
caif caif: remove unnecessary break after goto 2014-07-15 16:27:01 -07:00
can can: add hash based access to single EFF frame filters 2014-05-19 09:38:24 +02:00
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2014-06-12 23:06:23 -07:00
core net-timestamp: add key to disambiguate concurrent datagrams 2014-08-05 16:35:54 -07:00
dcb dcbnl : Fix misleading dcb_app->priority explanation 2014-07-30 17:21:05 -07:00
dccp inet: move ipv6only in sock_common 2014-07-01 23:46:21 -07:00
decnet net: Split sk_no_check into sk_no_check_{rx,tx} 2014-05-23 16:28:53 -04:00
dns_resolver dns_resolver: Null-terminate the right string 2014-07-20 22:33:32 -07:00
dsa net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
ethernet net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
hsr net/hsr: Remove left-over never-true conditional code. 2014-07-11 15:04:40 -07:00
ieee802154 inet: frags: use kmem_cache for inet_frag_queue 2014-08-02 15:31:31 -07:00
ipv4 net-timestamp: add key to disambiguate concurrent datagrams 2014-08-05 16:35:54 -07:00
ipv6 net-timestamp: add key to disambiguate concurrent datagrams 2014-08-05 16:35:54 -07:00
ipx net: Split sk_no_check into sk_no_check_{rx,tx} 2014-05-23 16:28:53 -04:00
irda irda: remove unnecessary break after return 2014-07-15 16:27:01 -07:00
iucv af_iucv: avoid path quiesce of severed path in shutdown() 2014-07-21 20:21:40 -07:00
key af_key: remove unnecessary break after return 2014-07-15 16:27:00 -07:00
l2tp net: use inet6_iif instead of IP6CB()->iif 2014-07-31 22:37:06 -07:00
lapb
llc
mac80211 Merge tag 'master-2014-07-25' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-07-28 17:36:25 -07:00
mac802154 net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
mpls gre: Call gso_make_checksum 2014-06-04 22:46:38 -07:00
netfilter nftables: Convert nft_hash to use generic rhashtable 2014-08-02 19:49:38 -07:00
netlabel netlabel: remove unnecessary break after goto 2014-07-15 16:27:00 -07:00
netlink netlink: fix lockdep splats 2014-08-04 22:58:06 -07:00
netrom net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
nfc Merge tag 'master-2014-07-31' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-08-05 13:18:20 -07:00
openvswitch net: Remove unlikely() for WARN_ON() conditions 2014-07-30 17:41:47 -07:00
packet packet: remove deprecated syststamp timestamp 2014-07-29 11:39:50 -07:00
phonet net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
rfkill Merge git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next 2014-05-22 13:58:36 -04:00
rose net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
rxrpc net/rxrpc/ar-key.c: drop negativity check on unsigned value 2014-07-20 21:25:56 -07:00
sched net: filter: split 'struct sk_filter' into socket and bpf parts 2014-08-02 15:03:58 -07:00
sctp net: fix the counter ICMP_MIB_INERRORS/ICMP6_MIB_INERRORS 2014-07-31 22:04:18 -07:00
sunrpc NFSv4: test SECINFO RPC_AUTH_GSS pseudoflavors for support 2014-06-24 18:46:58 -04:00
tipc tipc: remove duplicated include from socket.c 2014-07-29 15:51:14 -07:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
vmw_vsock vsock: Make transport the proto owner 2014-05-05 13:13:50 -04:00
wimax
wireless Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless 2014-07-25 10:22:36 -04:00
x25 net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
xfrm xfrm: Fix installation of AH IPsec SAs 2014-06-30 07:42:12 +02:00
compat.c net: sendmsg: fix NULL pointer dereference 2014-07-29 12:20:22 -07:00
Kconfig 6lowpan: introduce new net/6lowpan directory 2014-07-12 01:53:30 +02:00
Makefile 6lowpan: introduce new net/6lowpan directory 2014-07-12 01:53:30 +02:00
nonet.c
socket.c net-timestamp: move timestamp flags out of sk_flags 2014-08-05 16:35:54 -07:00
sysctl_net.c