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Commit 9108d5f4 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
Browse files

[TFRC]: Hide tx history details from the CCIDs 



Based on a previous patch by Gerrit Renker.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 95bdfccb

net/dccp/ccids/ccid3.c

+7 −12
Original line number Diff line number Diff line
@@ -399,7 +399,6 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 
{

	struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);

	struct ccid3_options_received *opt_recv;

	struct tfrc_tx_hist_entry *packet;

	ktime_t now;

	unsigned long t_nfb;

	u32 pinv, r_sample;
@@ -414,19 +413,17 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 
	switch (hctx->ccid3hctx_state) {

	case TFRC_SSTATE_NO_FBACK:

	case TFRC_SSTATE_FBACK:

		now = ktime_get_real();



		/* estimate RTT from history if ACK number is valid */

		packet = tfrc_tx_hist_find_entry(hctx->ccid3hctx_hist,

						 DCCP_SKB_CB(skb)->dccpd_ack_seq);

		if (packet == NULL) {

		r_sample = tfrc_tx_hist_rtt(hctx->ccid3hctx_hist,

					    DCCP_SKB_CB(skb)->dccpd_ack_seq, now);

		if (r_sample == 0) {

			DCCP_WARN("%s(%p): %s with bogus ACK-%llu\n", dccp_role(sk), sk,

				  dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type),

				  (unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq);

			return;

		}

		/*

		 * Garbage-collect older (irrelevant) entries

		 */

		tfrc_tx_hist_purge(&packet->next);



		/* Update receive rate in units of 64 * bytes/second */

		hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate;
@@ -438,12 +435,10 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 
			hctx->ccid3hctx_p = 0;

		else				       /* can not exceed 100% */

			hctx->ccid3hctx_p = 1000000 / pinv;



		now = ktime_get_real();

		/*

		 * Calculate new RTT sample and update moving average

		 * Validate new RTT sample and update moving average

		 */

		r_sample = dccp_sample_rtt(sk, ktime_us_delta(now, packet->stamp));

		r_sample = dccp_sample_rtt(sk, r_sample);

		hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9);



		if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {

net/dccp/ccids/lib/packet_history.c

+31 −2
Original line number Diff line number Diff line
@@ -39,12 +39,24 @@ 
#include <linux/string.h>

#include "packet_history.h"



/**

 *  tfrc_tx_hist_entry  -  Simple singly-linked TX history list

 *  @next:  next oldest entry (LIFO order)

 *  @seqno: sequence number of this entry

 *  @stamp: send time of packet with sequence number @seqno

 */

struct tfrc_tx_hist_entry {

	struct tfrc_tx_hist_entry *next;

	u64			  seqno;

	ktime_t			  stamp;

};



/*

 * Transmitter History Routines

 */

static struct kmem_cache *tfrc_tx_hist;



struct tfrc_tx_hist_entry *

static struct tfrc_tx_hist_entry *

	tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 seqno)

{

	while (head != NULL && head->seqno != seqno)
@@ -52,7 +64,6 @@ struct tfrc_tx_hist_entry * 


	return head;

}

EXPORT_SYMBOL_GPL(tfrc_tx_hist_find_entry);



int tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno)

{
@@ -83,6 +94,24 @@ void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp) 
}

EXPORT_SYMBOL_GPL(tfrc_tx_hist_purge);



u32 tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head, const u64 seqno,

		     const ktime_t now)

{

	u32 rtt = 0;

	struct tfrc_tx_hist_entry *packet = tfrc_tx_hist_find_entry(head, seqno);



	if (packet != NULL) {

		rtt = ktime_us_delta(now, packet->stamp);

		/*

		 * Garbage-collect older (irrelevant) entries:

		 */

		tfrc_tx_hist_purge(&packet->next);

	}



	return rtt;

}

EXPORT_SYMBOL_GPL(tfrc_tx_hist_rtt);



/*

 * 	Receiver History Routines

 */

net/dccp/ccids/lib/packet_history.h

+3 −14
Original line number Diff line number Diff line
@@ -48,23 +48,12 @@ 
#define TFRC_WIN_COUNT_PER_RTT	 4

#define TFRC_WIN_COUNT_LIMIT	16



/**

 *  tfrc_tx_hist_entry  -  Simple singly-linked TX history list

 *  @next:  next oldest entry (LIFO order)

 *  @seqno: sequence number of this entry

 *  @stamp: send time of packet with sequence number @seqno

 */

struct tfrc_tx_hist_entry {

	struct tfrc_tx_hist_entry *next;

	u64			  seqno;

	ktime_t			  stamp;

};

struct tfrc_tx_hist_entry;



extern int  tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno);

extern void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp);



extern struct tfrc_tx_hist_entry *

	tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 ackno);

extern u32  tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head,

			     const u64 seqno, const ktime_t now);



/*

 * 	Receiver History data structures and declarations