- 28 Jan, 2008 40 commits
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Pavel Emelyanov authored
The sock_wake_async() performs a bit different actions depending on "how" argument. Unfortunately this argument ony has numerical magic values. I propose to give names to their constants to help people reading this function callers understand what's going on without looking into this function all the time. I suppose this is 2.6.25 material, but if it's not (or the naming seems poor/bad/awful), I can rework it against the current net-2.6 tree. Signed-off-by:
Pavel Emelyanov <xemul@openvz.org> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Gerrit Renker authored
This continues from the previous patch and adds support for actively aborting a DCCP connection, using a Reset Code 2, "Aborted" to inform the peer of an abortive release. I have tried this in various client/server settings and it works as expected. Signed-off-by:
Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by:
Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
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Gerrit Renker authored
This removes one FIXME with regard to close when there is still unread data. The mechanism is implemented similar to TCP: with regard to DCCP-specifics, a Reset with Code 2, "Aborted" is sent to the peer. This corresponds in part to RFC 4340, 8.1.1 and 8.1.5. Signed-off-by:
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Gerrit Renker authored
This removes a comment which identifies an `issue' with dccp_write_xmit() where there is none. The comment assumes it is possible that a packet is sent between the calls to ccid_hc_tx_send_packet(), dccp_transmit_skb(), ccid_hc_tx_packet_sent() (in the above order) in dccp_write_xmit(). I think that this is impossible, since dccp_write_xmit() is always called under lock: * when called as dccp_write_xmit(sk, 1) from dccp_send_close(), the socket is locked (see code comment above dccp_send_close()); * when called as dccp_write_xmit(sk, 0) from dccp_send_msg(), it is after lock_sock() has been called; * when called as dccp_write_xmit(sk, 0) from dccp_write_xmit_timer(), bh_lock_sock() has been called and the if/else statement has made sure that sk_lock.owner is not set; * there are no other places where dccp_write_xmit() is called. Furthermore, the debug statement for printing the sequence number of the packet just sent has been removed, since the entire list is being printed anyway and so the entry of that number appears last. Signed-off-by:
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Gerrit Renker authored
The code used two different variables to count Acks, one of them redundant. This patch reduces the number of Ack counters to one. The type of the Ack counter has also been changed to u32 (twice the range of int); and the variable has been renamed into `packets_acked' - for consistency with RFC 3465 (and similarly named variables are used by TCP and SCTP). Lastly, a slightly less aggressive `maxincr' increment is used (for even Ack Ratios, maxincr was Ack Ratio/2 + 1 instead of Ack Ratio/2). Signed-off-by:
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Gerrit Renker authored
This removes the synchronisation variable `ccid2hctx_sendwait', which is set to 1 when the CCID2 sender may send a new packet, and which is set to 0 otherwise The variable is redundant, since it is only used in combination with the hc_tx_send_packet/ hc_tx_packet_sent function pair. Both functions are called under socket lock, so the following happens when the CCID2 may send a new packet: * it sets sendwait = 1 in tx_send_packet and returns 0; * the subsequent call to tx_packet_sent clears the sendwait flag; * since tx_send_packet returns 0 if and only if sendwait == 1, the BUG_ON condition in tx_packet_sent is never satisfied, since that function is never called when tx_send_packet returns a value different from 0 (cf. dccp_write_xmit); * the call to tx_packet_sent clears the flag so that the condition "!sendwait" is true the next time tx_packet_sent is called. In other words, it is sufficient to just return 0 / not-0 to synchronise tx_send_packet and tx_packet_sent -- which is what the patch does. Signed-off-by:
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Gerrit Renker authored
This reduces the amount of redundant debugging messages: * pipe/cwnd are printed in both tx_send_packet() and tx_packet_sent(). Both functions are called immediately after one another, so one occurrence is sufficient. * Since tx_packet_sent() prints pipe/cwnd already, the second printk for pipe is redundant. * In tx_packet_sent() the check_sanity function is called twice (at the begin and at the end). Signed-off-by:
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Gerrit Renker authored
The function ccid2_change_pipe only does an assignment. This patch simplifies the code by replacing the function with the assignment it performs. Furthermore, the type of pipe is promoted from `signed' to unsigned (increasing the range). As a result, a BUG_ON test for negative values now becomes obsolete (for safety not removed, but replaced with a less annoying `DCCP_BUG'). Signed-off-by:
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Gerrit Renker authored
The current function ccid2_change_cwnd in effect makes only an assignment, as the test whether cwnd has reached 0 is only required when cwnd is halved. This patch simplifies the code by replacing the function with the assignment it performs. Furthermore, since ssthresh derives from cwnd and appears in many assignments and comparisons, the type of ssthresh has also been changed to match that of cwnd. Signed-off-by:
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Gerrit Renker authored
This replaces the field member `numdupack', which was used as a read-only constant in the code, with a #define. Signed-off-by:
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Gerrit Renker authored
This removes a variable `ccid2hctx_sent' which is incremented but never referenced/read (i.e., dead code). Signed-off-by:
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Gerrit Renker authored
This comments out a problematic section comprising a half-finished algorithm: - The variable `ccid2hctx_ackloss' is never initialised to a value different from 0 and hence in fact is a read-only constant. - The `arsent' variable counts packets other than Acks (it is incremented for every packet), and there is no test for Ack Loss. - The concept of counting Acks as such leads to a complex calculation, and the calculation at the moment is inconsistent with this concept. The problem is that the number of Acks - rather than the number of windows - is counted, which leads to a complex (cubic/quadratic) expression - this is not even implemented. In its current state, the commented-out algorithm interfers with normal processing by changing Ack Ratio incorrectly, and at the wrong times. A new algorithm is necessary, which will not necessarily use the same variables as used by the unfinished one; hence the old variables have been removed. Signed-off-by:
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Gerrit Renker authored
RFC 4341, sec. 5 states that "The cwnd parameter is initialized to at most four packets for new connections, following the rules from [RFC3390]", which is implemented by this patch. Signed-off-by:
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Arnaldo Carvalho de Melo authored
This is because in the next patch CCID2 will assume that dccps_mss_cache is non-zero. Signed-off-by:
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Gerrit Renker authored
This patch removes a bug in the current code. I agree with Andrea's comment that there is a problem here but the way it is treated does not fix it. The problem is that whenever Ack Ratio > cwnd, starvation/deadlock occurs: * the receiver will not send an Ack until (Ack Ratio - cwnd) data packets have arrived; * the sender will not send any data packet before the receipt of an Ack advances the send window. The only way that the connection then progresses was via RTO timeout. In one extreme case (bulk transfer), it was observed that this happened for every single packet; i.e. hundreds of packets, each a RTO timeout of 1..3 seconds apart: a transfer which normally would take a fraction of a second thus grew to several minutes. The solution taken by this approach is to observe the relation "Ack Ratio <= cwnd" by using the constraint (1) from RFC 4341, 6.1.2; i.e. set Ack Ratio = ceil(cwnd / 2) and update it whenever either Ack Ratio or cwnd change. This ensures that the deadlock problem can not arise. Signed-off-by: -
Gerrit Renker authored
Since it makes not sense to assign negative values to Ack Ratio, this patch disallows this possibility. As a consequence, a Bug test for negative Ack Ratio values becomes obsolete. Furthermore, a check against overflow (as Ack Ratio may not exceed 2 bytes, due to RFC 4340, 11.3) has been added. Signed-off-by:
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Gerrit Renker authored
This replaces use of normal subtraction with modulo-48 subtraction. Signed-off-by:
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Gerrit Renker authored
In CCID2 the receiver-history is sorted in ascending order of sequence number, but the processing of received Ack Vectors requires the list traversal in the opposite direction. The current code has a bug in this regard: the list traversal is upwards. As a consequence, only Ack Vectors with a run length of 1 will pass, in all other Ack Vectors the remaining (acked) sequence numbers are missed, and may later falsely be identified as lost. Note: This bug is only visible when Ack Ratio > 1, since otherwise the run lengths of Ack Vectors are 0. Signed-off-by: -
Gerrit Renker authored
This is reduces the length of the struct ackvec/ackvec_record fields. It is a purely text-based replacement: s#dccpavr_#avr_#g; s#dccpav_#av_#g; and increases readability somewhat. Signed-off-by:
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Ilpo Järvinen authored
I keep getting this build error and couldn't find anyone fixing it in archives. ...Maybe all net developers except me build just SMP kernels :-). In file included from include/net/sock.h:50, from ipc/mqueue.c:35: include/linux/pcounter.h: In function 'pcounter_add': include/linux/pcounter.h:87: error: 'struct pcounter' has no member named 'value' make[1]: *** [ipc/mqueue.o] Error 1 make: *** [ipc] Error 2 Signed-off-by:Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Acked-by:
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Pavel Emelyanov authored
It seems that net/ipv6/af_inet6.c was copied from net/ipv4/af_inet.c, but one comment was not fixed. Signed-off-by:
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Pavel Emelyanov authored
The first_unix_socket() and next_unix_sockets() are now used in proc file and in forall_unix_socets macro only. The forall_unix_sockets is not used in this file at all so remove it. After this move the helpers to where they really belong, i.e. closer to proc code under the #ifdef CONFIG_PROC_FS option. Signed-off-by:
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Gerrit Renker authored
Signed-off-by:
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Gerrit Renker authored
Small update with regard to RFC 4340 (references added as documentation): on Requests, Ack Vectors / Elapsed Time should be ignored. Length handling of Elapsed Time also simplified. Signed-off-by:
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Gerrit Renker authored
This cleans up the consequences of an earlier patch which introduced the `if IP_DCCP' clause into net/dccp/Kconfig. The CCID Kconfig menu is sourced within this clause; as a consequence, all tests of type `depends on IP_DCCP' are now redundant. Signed-off-by:
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Gerrit Renker authored
This patch addresses the following problems: 1. DCCP relies for its proper functioning on having at least one CCID module enabled (as in TCP plugable congestion control). Currently it is possible to disable both CCIDs and thus leave the DCCP module in a compiled, but entirely non-functional state: no sockets can be created when no CCID is available. Furthermore, the protocol is (again like TCP) not intended to be used without CCIDs. Last, a non-empty CCID list is needed for doing CCID feature negotiation. 2. Internally the default CCID that is advertised by the Linux host is set to CCID2 (DCCPF_INITIAL_CCID in include/linux/dccp.h). Disabling CCID2 in the Kconfig menu without changing the defaults leads to a failure `module not found' when trying to load the dccp module (which internally tries to load the default CCID). 3. The specification (RFC 4340, sec. 10) treats CCID2 somewhat like a `minimum common denominator'; the specification says that: * "New connections start with CCID 2 for both endpoints" * "A DCCP implementation intended for general use, such as an implementation in a general-purpose operating system kernel, SHOULD implement at least CCID 2. The intent is to make CCID 2 broadly available for interoperability [...]" Providing CCID2 as minimum-required CCID (like Reno/Cubic in TCP) thus seems reasonable. Hence this patch automatically selects CCID2 when DCCP is enabled. Documentation also added. Discussions with Ian McDonald on this subject are gratefully acknowledged. Signed-off-by: -
Gerrit Renker authored
This updates the DCCP documentation, following input from Ian McDonald, clarifiying the status of DCCP, and adding a note about the test tree. Signed-off-by:
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Gerrit Renker authored
This extends the DCCP socket API by honouring any shutdown(2) option set by the user. The behaviour is, as much as possible, made consistent with the API for TCP's shutdown. This patch exploits the information provided by the user via the socket API to reduce processing costs: * if the read end is closed (SHUT_RD), it is not necessary to deliver to input CCID; * if the write end is closed (SHUT_WR), the same idea applies, but with a difference - as long as the TX queue has not been drained, we need to receive feedback to keep congestion-control rates up to date. Hence SHUT_WR is honoured only after the last packet (under congestion control) has been sent; * although SHUT_RDWR seems nonsensical, it is nevertheless supported in the same manner as for TCP (and agrees with test for SHUTDOWN_MASK in dccp_poll() in net/dccp/proto.c). Furthermore, most of the code already honours the sk_shutdown flags (dccp_recvmsg() for instance sets the read length to 0 if SHUT_RD had been called); CCID handling is now added to this by the present patch. There will also no longer be any delivery when the socket is in the final stages, i.e. when one of dccp_close(), dccp_fin(), or dccp_done() has been called - which is fine since at that stage the connection is its final stages. Motivation and background are on http://www.erg.abdn.ac.uk/users/gerrit/dccp/notes/shutdown A FIXME has been added to notify the other end if SHUT_RD has been set (RFC 4340, 11.7). Note: There is a comment in inet_shutdown() in net/ipv4/af_inet.c which asks to "make sure the socket is a TCP socket". This should probably be extended to mean `TCP or DCCP socket' (the code is also used by UDP and raw sockets). Signed-off-by:
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Gerrit Renker authored
This decouples PARTOPEN from TCP-specific stream-states. It thus addresses the FIXME. The code has been checked with regard to dependency on PARTOPEN and FIN_WAIT1 states (to which PARTOPEN previously was mapped): there is no difference, as PARTOPEN is always referred to directly (i.e. not via the mapping to TCP state). Signed-off-by:
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Gerrit Renker authored
The moving average computation occurs so frequently in the CCID 3 code that it merits an inline function of its own. This is uses a suggestion by Arnaldo as per http://www.mail-archive.com/dccp@vger.kernel.org/msg01662.htmlSigned-off-by:
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Gerrit Renker authored
This fixes/updates the handling of idle and application-limited periods in CCID3, which currently is broken: there is no detection as to how long a sender has been idle - there is only one flag which is toggled in between function calls. Being obsolete now, the `idle' flag is removed. Signed-off-by:
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Gerrit Renker authored
This patch fixes a previously undiscovered bug; the problem is in computing the elapsed time as the time between `receiving' the packet (i.e. skb enters CCID module) and sending feedback: - there is no layer-processing, queueing, or delay involved, - hence the elapsed time is in the order of 1 function call - this is in the dimension of maximally 50..100usec - which renders the use of elapsed time almost entirely useless. The fix is simply to ignore such trivial amounts of elapsed time. As a further advantage, the now useless elapsed_time field can be removed from the socket, which reduces the socket structure by another four bytes. Signed-off-by: -
Gerrit Renker authored
This updates the CCID3 code with regard to two instances of using `MSS' in place of `s': 1. The RFC3390-based initial rate: both rfc3448bis as well as the Faster Restart draft now consistently use `s' instead of MSS. 2. Now agrees with section 4.2 of rfc3448bis: "If the sender is ready to send data when it does not yet have a round trip sample, the value of X is set to s bytes per second, for segment size s [...]" Signed-off-by: -
Arnaldo Carvalho de Melo authored
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Arnaldo Carvalho de Melo authored
This just generalises what was introduced by Eric Dumazet for the struct proto inuse field in 286ab3d4: [NET]: Define infrastructure to keep 'inuse' changes in an efficent SMP/NUMA way. Please look at the comment in there to see the rationale. Signed-off-by:
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Johannes Berg authored
Hopefully that's the rest. Seems I didn't do a very thorough job removing the management interface. Signed-off-by:
Johannes Berg <johannes@sipsolutions.net> Signed-off-by:
John W. Linville <linville@tuxdriver.com> Signed-off-by:
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Ron Rindjunsky authored
This patch adds several structs and definitions to ieee80211.h to support 802.11n draft specifications. As 802.11n depends on and extends the 802.11e standard in several issues, there are also several definitions that belong to 802.11e. Signed-off-by:
Ron Rindjunsky <ron.rindjunsky@intel.com> Signed-off-by:
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Helmut Schaa authored
This patch removes all references to local->scan_flags as these are not used anymore since the removal of prism2 ioctls. Signed-off-by:
Helmut Schaa <hschaa@suse.de> Signed-off-by:
Jiri Benc <jbenc@suse.cz> Signed-off-by:
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Johannes Berg authored
Sometimes drivers need to know which interfaces are associated with their hardware. Rather than forcing those drivers to keep track of the interfaces that were added, this adds an iteration function to mac80211. As it is intended to be used from the interface add/remove callbacks, the iteration function may currently only be called under RTNL. Signed-off-by:
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Pavel Emelyanov authored
This function references sk->sk_prot->xxx for many times. It turned out, that there's so many code in it, that gcc cannot always optimize access to sk->sk_prot's fields. After saving the sk->sk_prot on the stack and comparing disassembled code, it turned out that the function became ~10 bytes shorter and made less dereferences (on i386 and x86_64). Stack consumption didn't grow. Besides, this patch drives most of this function into the 80 columns limit. Signed-off-by:
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