Commit Graph

33 Commits

Author SHA1 Message Date
Arnaldo Carvalho de Melo b0e567806d [DCCP] Introduce dccp_timestamp
To start the timestamps with 0.0ms, easing the integer maths in the CCIDs, this
probably will be reworked to use the to be introduced struct timeval_offset
infrastructure out of skb_get_timestamp, etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:38:35 -03:00
Arnaldo Carvalho de Melo 954ee31f36 [CCID3] Initialize more fields in ccid3_hc_rx_init
The initialization of ccid3hcrx_rtt to 5ms is just a bandaid, I'll continue
auditing the CCID3 HC rx codebase to fix this properly, probably I'll add a
feedback timer as suggested in the CCID3 draft.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:37:05 -03:00
Arnaldo Carvalho de Melo b3a3077d96 [CCID3] Make the ccid3hcrx_rtt calc look more like the ccid3hctx_rtt one
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:34:10 -03:00
Arnaldo Carvalho de Melo 1a28599a2c [CCID3] Use ELAPSED_TIME in the HC TX RTT estimation
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:32:56 -03:00
Arnaldo Carvalho de Melo 27ae543e6f [CCID3] Calculate ccid3hcrx_x_recv using usecs_div
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:31:07 -03:00
Arnaldo Carvalho de Melo 507d37cf26 [CCID] Only call the HC insert_options methods when requested
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:30:07 -03:00
Arnaldo Carvalho de Melo 0ba7a3ba66 [CCID3] Avoid unsigned integer overflows in usecs_div
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-09-09 02:28:47 -03:00
Arnaldo Carvalho de Melo c530cfb1ce [CCID3]: Call sk->sk_write_space(sk) when receiving a feedback packet
This makes the send rate calculations behave way more closely to what
is specified, with the jitter previously seen on x and x_recv
disappearing completely on non lossy setups.

This resembles the tcp_data_snd_check code, that possibly we'll end up
using in DCCP as well, perhaps moving this code to
inet_connection_sock.

For now I'm doing the simplest implementation tho.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:13:46 -07:00
Arnaldo Carvalho de Melo a84ffe4303 [DCCP]: Introduce DCCP_SOCKOPT_PACKET_SIZE
So that applications can set dccp_sock->dccps_pkt_size, that in turn
is used in the CCID3 half connection init routines to set
ccid3hc[tr]x_s and use it in its rate calculations.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:13:37 -07:00
Arnaldo Carvalho de Melo 29e4f8b3c3 [CCID3]: Move ccid3_hc_rx_detect_loss to packet_history.c
Renaming it to dccp_rx_hist_detect_loss.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:13:17 -07:00
Arnaldo Carvalho de Melo 072ab6c68e [CCID3]: Move ccid3_hc_rx_add_hist to packet_history.c
Renaming it to dccp_rx_hist_add_packet.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:13:10 -07:00
Arnaldo Carvalho de Melo 36729c1a73 [DCCP]: Move the calc_X routines to dccp_tfrc_lib
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:12:47 -07:00
Arnaldo Carvalho de Melo 4524b25954 [DCCP]: Just move packet_history.[ch] to net/dccp/ccids/lib/
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:12:25 -07:00
Arnaldo Carvalho de Melo ae6706f067 [CCID3]: Move the loss interval code to loss_interval.[ch]
And put this into net/dccp/ccids/lib/, where packet_history.[ch] will also be
moved and then we'll have a tfrc_lib.ko module that will be used by
dccp_ccid3.ko and other CCIDs that are variations of TFRC (RFC 3448).

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:12:17 -07:00
Arnaldo Carvalho de Melo cfc3c525a3 [CCID3]: Move the CCID3 defines to ccid3.h
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:12:10 -07:00
Arnaldo Carvalho de Melo 6b5e633ab1 [CCID3]: Introduce usecs_div
To avoid open coding this all over the place.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:12:03 -07:00
Arnaldo Carvalho de Melo b6ee3d4ada [CCID3]: Reorganise timeval handling
Introducing functions to add to or subtract from a timeval variable
and renaming now_delta to timeval_new_delta that calls do_gettimeofday
and then timeval_delta, that should be used when there are several
deltas made relative to the current time or setting variables to it,
so as to avoid calling do_gettimeofday excessively.

I'm leaving these "timeval_" prefixed funcions internal to DCCP for a
while till we're sure there are no subtle bugs in it.

It also is more correct as it checks if the number of usecs added to
or subtracted from a tv_usec field is more than 2 seconds.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:11:56 -07:00
Arnaldo Carvalho de Melo 1f2333aea3 [CCID3]: Reflow to mostly fit under 80 columns
No code changes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:11:46 -07:00
Arnaldo Carvalho de Melo d6809c12b3 [DCCP]: Introduce dccp_wait_for_ccid and use it in dccp_write_xmit
This is not quite what I think we should have long term but improves
performance for now, so lets use it till we get CCID3 working well,
then we can think about using sk_write_queue, perhaps using some ideas
from Juwen Lai's old stack for 2.4.20.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:11:38 -07:00
Eric Dumazet ba89966c19 [NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers
This patch puts mostly read only data in the right section
(read_mostly), to help sharing of these data between CPUS without
memory ping pongs.

On one of my production machine, tcp_statistics was sitting in a
heavily modified cache line, so *every* SNMP update had to force a
reload.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:11:18 -07:00
Arnaldo Carvalho de Melo 2babe1f6fe [DCCP]: Introduce dccp_get_info
And also hc_tx and hc_rx get_info functions for the CCIDs to fill in
information that is specific to them.

For now reusing struct tcp_info, later I'll try to figure out a better
solution, for now its really nice to get this kind of info:

[root@qemu ~]# ./ss -danemi
State       Recv-Q Send-Q  Local Addr:Port  Peer Addr:Port
LISTEN      0      0                *:5001          *:*     ino:628 sk:c1340040
         mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
ESTAB       0      0       172.20.0.2:5001 172.20.0.1:32785 ino:629 sk:c13409a0
         mem:(r0,w0,f0,t0) ts rto:1000 rtt:0.004/0 cwnd:0 ssthresh:0 rcv_rtt:61.377

This, for instance, shows that we're not congestion controlling ACKs,
as the above output is in the ttcp receiving host, and ttcp is a one
way app, i.e. the received never calls sendmsg, so
ccid_hc_tx_send_packet is never called, so the TX half connection
stays in TFRC_SSTATE_NO_SENT state and hctx_rtt is never calculated,
stays with the value set in ccid3_hc_tx_init, 4us, as show above in
milliseconds (0.004ms), upcoming patches will fix this.

rcv_rtt seems sane tho, matching ping results :-)

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:05:07 -07:00
Arnaldo Carvalho de Melo 4fded33b3e [CCID3]: Calculate the RTT in the RX half connection
Using TIMESTAMP_ECHO and ELAPSED_TIME options received.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:05:01 -07:00
Arnaldo Carvalho de Melo c68e64cfb5 [CCID3]: Reintroduce ccid3hctx_t_rto
CCID3 keeps this variable in usecs, inet_connection_socks in jiffies,
so to avoid Mars orbiter losses lets reintroduce ccid3hctx_t_rto 8)

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:03:18 -07:00
Ian McDonald 1bc0986957 [DCCP]: Fix the timestamp options
This changes timestamp, timestamp echo, and elapsed time to use units of 10
usecs as per DCCP spec. This has been tested to verify that times are correct.
Also fixed up length and used hton/ntoh more.

Still to add in later patches:
- actually use elapsed time to adjust RTT
(commented out as was prior to this patch)
- send options at times more closely following the spec
(content is now correct)

Signed-off-by: Ian McDonald <iam4@cs.waikato.ac.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:02:34 -07:00
Patrick McHardy a10cedd4b9 [DCCP]: Fix compiler warnings
may be a false warning if there always is something on ccid3hcrx_hist:

net/dccp/ccids/ccid3.c: In function 'ccid3_hc_rx_packet_recv':
net/dccp/ccids/ccid3.c:1634: warning: 'tstamp.tv_usec' may be used uninitialized in this function
net/dccp/ccids/ccid3.c:1634: warning: 'tstamp.tv_sec' may be used uninitialized in this function

const on inline functions doesn't have any effect:

net/dccp/dccp.h:64: warning: type qualifiers ignored on function return type
net/dccp/dccp.h:70: warning: type qualifiers ignored on function return type
net/dccp/dccp.h:76: warning: type qualifiers ignored on function return type

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:00:12 -07:00
Arnaldo Carvalho de Melo a1d3a35518 [DCCP]: Fix sparse warnings
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:59:59 -07:00
Arnaldo Carvalho de Melo 725ba8eee3 [DCCP]: Introduce the DCCP Kernel hacking menu
Only available if CONFIG_DEBUG_KERNEL is enabled in the "Kernel
Hacking" Menu.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:59:43 -07:00
Arnaldo Carvalho de Melo c173437669 [PACKET_HISTORY]: Add dccphtx_rtt and rename the win_count fields
As requested by Ian.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: Ian McDonald <iam4@cs.waikato.ac.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:59:17 -07:00
Arnaldo Carvalho de Melo cef07fd602 [CCID3]: Ditch USEC_IN_SEC as time.h has USEC_PER_SEC
That is equivalent, no need to have a private one.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-08-29 15:56:33 -07:00
Arnaldo Carvalho de Melo 8c60f3fab5 [CCID3]: Separate most of the packet history code
This also changes the list_for_each_entry_safe_continue behaviour to match its
kerneldoc comment, that is, to start after the pos passed.

Also adds several helper functions from previously open coded fragments, making
the code more clear.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
2005-08-29 15:56:28 -07:00
Arnaldo Carvalho de Melo 27258ee54f [DCCP]: Introduce dccp_write_xmit from code in dccp_sendmsg
This way it gets closer to the TCP flow, where congestion window
checks are done, it seems we can map ccid_hc_tx_send_packet in
dccp_write_xmit to tcp_snd_wnd_test in tcp_write_xmit, a CCID2
decision should just fit in here as well...

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:55:18 -07:00
Arnaldo Carvalho de Melo 757f612e09 [CCID3]: Reenable list_for_each_entry_safe_continue usage
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:50:08 -07:00
Arnaldo Carvalho de Melo 7c657876b6 [DCCP]: Initial implementation
Development to this point was done on a subversion repository at:

http://oops.ghostprotocols.net:81/cgi-bin/viewcvs.cgi/dccp-2.6/

This repository will be kept at this site for the foreseable future,
so that interested parties can see the history of this code,
attributions, etc.

If I ever decide to take this offline I'll provide the full history at
some other suitable place.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:49:46 -07:00