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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2010-10-27 19:16:26 +0000
committerDavid S. Miller <davem@davemloft.net>2010-10-28 10:27:00 -0700
commitdc841e30eaea9f9f83c9ab1ee0b3ef9e5c95ce8a (patch)
tree921458d0ea02f1478dbac9305c1925dbea8c0dd9 /net/dccp/proto.c
parentdccp: Return-value convention of hc_tx_send_packet() (diff)
downloadlinux-dev-dc841e30eaea9f9f83c9ab1ee0b3ef9e5c95ce8a.tar.xz
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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 'net/dccp/proto.c')
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