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fb529e62d3
linux/net
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Florian Westphal fb529e62d3 mptcp: break and restart in case mptcp sndbuf is full 
Its not enough to check for available tcp send space.

We also hold on to transmitted data for mptcp-level retransmits.
Right now we will send more and more data if the peer can ack data
at the tcp level fast enough, since that frees up tcp send buffer space.

But we also need to check that data was acked and reclaimed at the mptcp
level.

Therefore add needed check in mptcp_sendmsg, flush tcp data and
wait until more mptcp snd space becomes available if we are over the
limit.  Before we wait for more data, also make sure we start the
retransmit timer if we ran out of sndbuf space.

Otherwise there is a very small chance that we wait forever:

 * receiver is waiting for data
 * sender is blocked because mptcp socket buffer is full
 * at tcp level, all data was acked
 * mptcp-level snd_una was not updated, because last ack
   that acknowledged the last data packet carried an older
   MPTCP-ack.

Restarting the retransmit timer avoids this problem: if TCP
subflow is idle, data is retransmitted from the RTX queue.

New data will make the peer send a new, updated MPTCP-Ack.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-17 12:35:34 -07:00
..
6lowpan
9p 9pnet: allow making incomplete read requests 2020-03-27 09:29:56 +00:00
802 net: 802: psnap.c: Use built-in RCU list checking 2020-02-24 13:02:53 -08:00
8021q netpoll: accept NULL np argument in netpoll_send_skb() 2020-05-07 18:11:07 -07:00
appletalk
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-06 22:10:13 -07:00
ax25 docs: networking: convert ax25.txt to ReST 2020-04-28 14:38:38 -07:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-06 22:10:13 -07:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next 2020-05-13 12:20:12 -07:00
bpf bpf: Add xdp.frame_sz in bpf_prog_test_run_xdp(). 2020-05-14 21:21:56 -07:00
bpfilter SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
bridge net: bridge: allow enslaving some DSA master network devices 2020-05-10 19:52:33 -07:00
caif net: caif: Fix use correct return type for ndo_start_xmit() 2020-04-30 12:13:07 -07:00
can
ceph docs: networking: convert dns_resolver.txt to ReST 2020-04-28 14:39:46 -07:00
core netns: enable to inherit devconf from current netns 2020-05-16 13:46:37 -07:00
dcb
dccp dccp: remove unused inline function dccp_set_seqno 2020-04-25 20:42:57 -07:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2020-05-01 17:02:27 -07:00
dns_resolver docs: networking: convert dns_resolver.txt to ReST 2020-04-28 14:39:46 -07:00
dsa net: dsa: tag_sja1105: appease sparse checks for ethertype accessors 2020-05-12 18:02:42 -07:00
ethernet net: remove eth_change_mtu 2020-01-27 11:09:31 +01:00
ethtool ethtool: don't call set_channels in drivers if config didn't change 2020-05-16 13:56:30 -07:00
hsr hsr: remove WARN_ONCE() in hsr_fill_frame_info() 2020-05-07 17:40:02 -07:00
ieee802154 ieee802154: 6lowpan: remove unnecessary comparison 2020-05-08 22:25:10 -07:00
ife
ipv4 netns: enable to inherit devconf from current netns 2020-05-16 13:46:37 -07:00
ipv6 netns: enable to inherit devconf from current netns 2020-05-16 13:46:37 -07:00
iucv
kcm net: kcm: kcmproc.c: Fix RCU list suspicious usage warning 2020-03-16 17:14:02 -07:00
key
l2tp net: partially revert dynamic lockdep key changes 2020-05-04 12:05:56 -07:00
l3mdev
lapb docs: networking: convert lapb-module.txt to ReST 2020-04-30 12:56:35 -07:00
llc af_llc: fix if-statement empty body warning 2020-02-26 20:38:13 -08:00
mac80211 docs: networking: convert mac80211-injection.txt to ReST 2020-04-30 12:56:36 -07:00
mac802154
mpls sysctl: pass kernel pointers to ->proc_handler 2020-04-27 02:07:40 -04:00
mptcp mptcp: break and restart in case mptcp sndbuf is full 2020-05-17 12:35:34 -07:00
ncsi net/ncsi: Support for multi host mellanox card 2020-01-09 18:36:22 -08:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:48:59 -07:00
netlabel netlabel: cope with NULL catmap 2020-05-12 18:12:40 -07:00
netlink bpf: Enable bpf_iter targets registering ctx argument types 2020-05-13 12:30:50 -07:00
netrom net: partially revert dynamic lockdep key changes 2020-05-04 12:05:56 -07:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-03-12 22:34:48 -07:00
nsh
openvswitch net: openvswitch: use div_u64() for 64-by-32 divisions 2020-04-25 20:48:21 -07:00
packet net/packet: tpacket_rcv: avoid a producer race condition 2020-03-15 00:25:25 -07:00
phonet sysctl: pass kernel pointers to ->proc_handler 2020-04-27 02:07:40 -04:00
psample
qrtr net: qrtr: Do not depend on ARCH_QCOM 2020-05-07 13:21:12 -07:00
rds Merge branch 'work.sysctl' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-04-28 21:23:38 +02:00
rfkill
rose net: partially revert dynamic lockdep key changes 2020-05-04 12:05:56 -07:00
rxrpc docs: networking: convert rxrpc.txt to ReST 2020-04-30 12:56:38 -07:00
sched net: sched: cls_flower: implement terse dump support 2020-05-15 10:23:11 -07:00
sctp Merge branch 'work.sysctl' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-04-28 21:23:38 +02:00
smc net/smc: remove set but not used variables 'del_llc, del_llc_resp' 2020-05-07 18:05:07 -07:00
strparser
sunrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-15 13:48:59 -07:00
switchdev net: switchdev: do not propagate bridge updates across bridges 2020-02-26 20:58:33 -08:00
tipc tipc: fix failed service subscription deletion 2020-05-13 12:33:19 -07:00
tls net/tls: Fix sk_psock refcnt leak when in tls_data_ready() 2020-04-27 11:22:38 -07:00
unix net: datagram: drop 'destructor' argument from several helpers 2020-02-28 12:12:53 -08:00
vmw_vsock vsock/virtio: fix multiple packet delivery to monitoring devices 2020-04-27 10:18:01 -07:00
wimax
wireless netlink: remove NLA_EXACT_LEN_WARN 2020-04-30 17:51:42 -07:00
x25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-06 22:10:13 -07:00
xdp xsk: Remove unnecessary member in xdp_umem 2020-05-04 22:56:26 +02:00
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2020-03-30 10:59:20 -07:00
compat.c net: cleanly handle kernel vs user buffers for ->msg_control 2020-05-11 16:59:16 -07:00
Kconfig net: ethtool: netlink: Add support for triggering a cable test 2020-05-10 12:28:41 -07:00
Makefile mptcp: Add MPTCP socket stubs 2020-01-24 13:44:07 +01:00
socket.c net: cleanly handle kernel vs user buffers for ->msg_control 2020-05-11 16:59:16 -07:00
sysctl_net.c