/*
* net/dccp/ccids/ccid3.h
*
- * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
+ * Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand.
+ * Copyright (c) 2007 The University of Aberdeen, Scotland, UK
*
* An implementation of the DCCP protocol
*
#ifndef _DCCP_CCID3_H_
#define _DCCP_CCID3_H_
+#include <linux/ktime.h>
#include <linux/list.h>
-#include <linux/time.h>
#include <linux/types.h>
#include <linux/tfrc.h>
+#include "lib/tfrc.h"
#include "../ccid.h"
-#define TFRC_MIN_PACKET_SIZE 16
-#define TFRC_STD_PACKET_SIZE 256
-#define TFRC_MAX_PACKET_SIZE 65535
-
-/* Two seconds as per CCID3 spec */
+/* Two seconds as per RFC 3448 4.2 */
#define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC)
-#define TFRC_INITIAL_IPI (USEC_PER_SEC / 4)
-
/* In usecs - half the scheduling granularity as per RFC3448 4.6 */
#define TFRC_OPSYS_HALF_TIME_GRAN (USEC_PER_SEC / (2 * HZ))
-/* In seconds */
-#define TFRC_MAX_BACK_OFF_TIME 64
-
-#define TFRC_SMALLEST_P 40
+/* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
+#define TFRC_T_MBI 64
enum ccid3_options {
TFRC_OPT_LOSS_EVENT_RATE = 192,
u32 ccid3or_receive_rate;
};
-/** struct ccid3_hc_tx_sock - CCID3 sender half connection sock
+/* TFRC sender states */
+enum ccid3_hc_tx_states {
+ TFRC_SSTATE_NO_SENT = 1,
+ TFRC_SSTATE_NO_FBACK,
+ TFRC_SSTATE_FBACK,
+ TFRC_SSTATE_TERM,
+};
+
+/** struct ccid3_hc_tx_sock - CCID3 sender half-connection socket
*
- * @ccid3hctx_state - Sender state
- * @ccid3hctx_x - Current sending rate
- * @ccid3hctx_x_recv - Receive rate
- * @ccid3hctx_x_calc - Calculated send (?) rate
- * @ccid3hctx_s - Packet size
- * @ccid3hctx_rtt - Estimate of current round trip time in usecs
- * @@ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
- * @ccid3hctx_last_win_count - Last window counter sent
- * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
- * with last_win_count value sent
- * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
- * @ccid3hctx_idle - FIXME
- * @ccid3hctx_t_ld - Time last doubled during slow start
- * @ccid3hctx_t_nom - Nominal send time of next packet
- * @ccid3hctx_t_ipi - Interpacket (send) interval
- * @ccid3hctx_delta - Send timer delta
- * @ccid3hctx_hist - Packet history
- */
+ * @ccid3hctx_x - Current sending rate in 64 * bytes per second
+ * @ccid3hctx_x_recv - Receive rate in 64 * bytes per second
+ * @ccid3hctx_x_calc - Calculated rate in bytes per second
+ * @ccid3hctx_rtt - Estimate of current round trip time in usecs
+ * @ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
+ * @ccid3hctx_s - Packet size in bytes
+ * @ccid3hctx_t_rto - Nofeedback Timer setting in usecs
+ * @ccid3hctx_t_ipi - Interpacket (send) interval (RFC 3448, 4.6) in usecs
+ * @ccid3hctx_state - Sender state, one of %ccid3_hc_tx_states
+ * @ccid3hctx_last_win_count - Last window counter sent
+ * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
+ * with last_win_count value sent
+ * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
+ * @ccid3hctx_t_ld - Time last doubled during slow start
+ * @ccid3hctx_t_nom - Nominal send time of next packet
+ * @ccid3hctx_delta - Send timer delta (RFC 3448, 4.6) in usecs
+ * @ccid3hctx_hist - Packet history
+ * @ccid3hctx_options_received - Parsed set of retrieved options
+ */
struct ccid3_hc_tx_sock {
struct tfrc_tx_info ccid3hctx_tfrc;
#define ccid3hctx_x ccid3hctx_tfrc.tfrctx_x
#define ccid3hctx_t_rto ccid3hctx_tfrc.tfrctx_rto
#define ccid3hctx_t_ipi ccid3hctx_tfrc.tfrctx_ipi
u16 ccid3hctx_s;
- u8 ccid3hctx_state;
+ enum ccid3_hc_tx_states ccid3hctx_state:8;
u8 ccid3hctx_last_win_count;
- u8 ccid3hctx_idle;
- struct timeval ccid3hctx_t_last_win_count;
+ ktime_t ccid3hctx_t_last_win_count;
struct timer_list ccid3hctx_no_feedback_timer;
- struct timeval ccid3hctx_t_ld;
- struct timeval ccid3hctx_t_nom;
+ ktime_t ccid3hctx_t_ld;
+ ktime_t ccid3hctx_t_nom;
u32 ccid3hctx_delta;
- struct list_head ccid3hctx_hist;
+ struct tfrc_tx_hist_entry *ccid3hctx_hist;
struct ccid3_options_received ccid3hctx_options_received;
};
-struct ccid3_hc_rx_sock {
- struct tfrc_rx_info ccid3hcrx_tfrc;
-#define ccid3hcrx_x_recv ccid3hcrx_tfrc.tfrcrx_x_recv
-#define ccid3hcrx_rtt ccid3hcrx_tfrc.tfrcrx_rtt
-#define ccid3hcrx_p ccid3hcrx_tfrc.tfrcrx_p
- u64 ccid3hcrx_seqno_nonloss:48,
- ccid3hcrx_ccval_nonloss:4,
- ccid3hcrx_state:8,
- ccid3hcrx_ccval_last_counter:4;
- u32 ccid3hcrx_bytes_recv;
- struct timeval ccid3hcrx_tstamp_last_feedback;
- struct timeval ccid3hcrx_tstamp_last_ack;
- struct list_head ccid3hcrx_hist;
- struct list_head ccid3hcrx_li_hist;
- u16 ccid3hcrx_s;
- u32 ccid3hcrx_pinv;
- u32 ccid3hcrx_elapsed_time;
-};
-
static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
{
- return ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
+ struct ccid3_hc_tx_sock *hctx = ccid_priv(dccp_sk(sk)->dccps_hc_tx_ccid);
+ BUG_ON(hctx == NULL);
+ return hctx;
}
+/* TFRC receiver states */
+enum ccid3_hc_rx_states {
+ TFRC_RSTATE_NO_DATA = 1,
+ TFRC_RSTATE_DATA,
+ TFRC_RSTATE_TERM = 127,
+};
+
+/** struct ccid3_hc_rx_sock - CCID3 receiver half-connection socket
+ *
+ * @ccid3hcrx_x_recv - Receiver estimate of send rate (RFC 3448 4.3)
+ * @ccid3hcrx_rtt - Receiver estimate of rtt (non-standard)
+ * @ccid3hcrx_p - Current loss event rate (RFC 3448 5.4)
+ * @ccid3hcrx_last_counter - Tracks window counter (RFC 4342, 8.1)
+ * @ccid3hcrx_state - Receiver state, one of %ccid3_hc_rx_states
+ * @ccid3hcrx_bytes_recv - Total sum of DCCP payload bytes
+ * @ccid3hcrx_x_recv - Receiver estimate of send rate (RFC 3448, sec. 4.3)
+ * @ccid3hcrx_rtt - Receiver estimate of RTT
+ * @ccid3hcrx_tstamp_last_feedback - Time at which last feedback was sent
+ * @ccid3hcrx_tstamp_last_ack - Time at which last feedback was sent
+ * @ccid3hcrx_hist - Packet history (loss detection + RTT sampling)
+ * @ccid3hcrx_li_hist - Loss Interval database
+ * @ccid3hcrx_s - Received packet size in bytes
+ * @ccid3hcrx_pinv - Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
+ */
+struct ccid3_hc_rx_sock {
+ u8 ccid3hcrx_last_counter:4;
+ enum ccid3_hc_rx_states ccid3hcrx_state:8;
+ u32 ccid3hcrx_bytes_recv;
+ u32 ccid3hcrx_x_recv;
+ u32 ccid3hcrx_rtt;
+ ktime_t ccid3hcrx_tstamp_last_feedback;
+ struct tfrc_rx_hist ccid3hcrx_hist;
+ struct tfrc_loss_hist ccid3hcrx_li_hist;
+ u16 ccid3hcrx_s;
+#define ccid3hcrx_pinv ccid3hcrx_li_hist.i_mean
+};
+
static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
{
- return ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
+ struct ccid3_hc_rx_sock *hcrx = ccid_priv(dccp_sk(sk)->dccps_hc_rx_ccid);
+ BUG_ON(hcrx == NULL);
+ return hcrx;
}
#endif /* _DCCP_CCID3_H_ */
projects / linux-2.6-omap-h63xx.git / blobdiff