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author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2010-10-27 19:16:26 +0000 |
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committer | David S. Miller <davem@davemloft.net> | 2010-10-28 10:27:00 -0700 |
commit | dc841e30eaea9f9f83c9ab1ee0b3ef9e5c95ce8a (patch) | |
tree | 921458d0ea02f1478dbac9305c1925dbea8c0dd9 /drivers | |
parent | fe84f4140f0d24deca8591e38926b95cfd097e62 (diff) | |
download | blackbird-op-linux-dc841e30eaea9f9f83c9ab1ee0b3ef9e5c95ce8a.tar.gz blackbird-op-linux-dc841e30eaea9f9f83c9ab1ee0b3ef9e5c95ce8a.zip |
dccp: Extend CCID packet dequeueing interface
This extends the packet dequeuing interface of dccp_write_xmit() to allow
1. CCIDs to take care of timing when the next packet may be sent;
2. delayed sending (as before, with an inter-packet gap up to 65.535 seconds).
The main purpose is to take CCID-2 out of its polling mode (when it is network-
limited, it tries every millisecond to send, without interruption).
The mode of operation for (2) is as follows:
* new packet is enqueued via dccp_sendmsg() => dccp_write_xmit(),
* ccid_hc_tx_send_packet() detects that it may not send (e.g. window full),
* it signals this condition via `CCID_PACKET_WILL_DEQUEUE_LATER',
* dccp_write_xmit() returns without further action;
* after some time the wait-condition for CCID becomes true,
* that CCID schedules the tasklet,
* tasklet function calls ccid_hc_tx_send_packet() via dccp_write_xmit(),
* since the wait-condition is now true, ccid_hc_tx_packet() returns "send now",
* packet is sent, and possibly more (since dccp_write_xmit() loops).
Code reuse: the taskled function calls dccp_write_xmit(), the timer function
reduces to a wrapper around the same code.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions