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dccp ccid-2: Overhaul CCID naming convention 1/2

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This patch starts a less problematic naming convention for CCID structs.

The old naming convention used 'hc{tx,rx}->ccid?hc{tx,rx}->...' as
recurring prefixes, which made the code
 * hard to write (not easy to fit into 80 characters);
 * hard to read  (most of the space is occupied by prefixes).

The new naming scheme:
 * struct entries for the TX socket are prefixed by 'tx_';
 * and those for the RX socket are prefixed by 'rx_'.

The identifiers then remain distinguishable when grep-ing through the tree:
 (a) RX/TX sockets are distinguished by the naming scheme,
 (b) individual CCIDs are distinguished by filename (ccid{2,3,4}.{c,h}).

This first patch implements the scheme for CCID-2.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2009-10-05 00:53:10 +00:00 committed by David S. Miller
parent 78122a52b3
commit b1c00fe3cf
2 changed files with 158 additions and 161 deletions
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273
net/dccp/ccids/ccid2.c
View file

@ -37,16 +37,16 @@ static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
{
int len = 0;
int pipe = 0;
struct ccid2_seq *seqp = hctx->ccid2hctx_seqh;
struct ccid2_seq *seqp = hctx->tx_seqh;
/* there is data in the chain */
if (seqp != hctx->ccid2hctx_seqt) {
if (seqp != hctx->tx_seqt) {
seqp = seqp->ccid2s_prev;
len++;
if (!seqp->ccid2s_acked)
pipe++;
while (seqp != hctx->ccid2hctx_seqt) {
while (seqp != hctx->tx_seqt) {
struct ccid2_seq *prev = seqp->ccid2s_prev;
len++;
@ -63,16 +63,16 @@ static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
}
}
BUG_ON(pipe != hctx->ccid2hctx_pipe);
BUG_ON(pipe != hctx->tx_pipe);
ccid2_pr_debug("len of chain=%d\n", len);
do {
seqp = seqp->ccid2s_prev;
len++;
} while (seqp != hctx->ccid2hctx_seqh);
} while (seqp != hctx->tx_seqh);
ccid2_pr_debug("total len=%d\n", len);
BUG_ON(len != hctx->ccid2hctx_seqbufc * CCID2_SEQBUF_LEN);
BUG_ON(len != hctx->tx_seqbufc * CCID2_SEQBUF_LEN);
}
#else
#define ccid2_pr_debug(format, a...)
@ -85,8 +85,8 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx)
int i;
/* check if we have space to preserve the pointer to the buffer */
if (hctx->ccid2hctx_seqbufc >= (sizeof(hctx->ccid2hctx_seqbuf) /
sizeof(struct ccid2_seq*)))
if (hctx->tx_seqbufc >= (sizeof(hctx->tx_seqbuf) /
sizeof(struct ccid2_seq *)))
return -ENOMEM;
/* allocate buffer and initialize linked list */
@ -102,20 +102,20 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx)
seqp->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
/* This is the first allocation. Initiate the head and tail. */
if (hctx->ccid2hctx_seqbufc == 0)
hctx->ccid2hctx_seqh = hctx->ccid2hctx_seqt = seqp;
if (hctx->tx_seqbufc == 0)
hctx->tx_seqh = hctx->tx_seqt = seqp;
else {
/* link the existing list with the one we just created */
hctx->ccid2hctx_seqh->ccid2s_next = seqp;
seqp->ccid2s_prev = hctx->ccid2hctx_seqh;
hctx->tx_seqh->ccid2s_next = seqp;
seqp->ccid2s_prev = hctx->tx_seqh;
hctx->ccid2hctx_seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hctx->ccid2hctx_seqt;
hctx->tx_seqt->ccid2s_prev = &seqp[CCID2_SEQBUF_LEN - 1];
seqp[CCID2_SEQBUF_LEN - 1].ccid2s_next = hctx->tx_seqt;
}
/* store the original pointer to the buffer so we can free it */
hctx->ccid2hctx_seqbuf[hctx->ccid2hctx_seqbufc] = seqp;
hctx->ccid2hctx_seqbufc++;
hctx->tx_seqbuf[hctx->tx_seqbufc] = seqp;
hctx->tx_seqbufc++;
return 0;
}
@ -124,7 +124,7 @@ static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
if (hctx->ccid2hctx_pipe < hctx->ccid2hctx_cwnd)
if (hctx->tx_pipe < hctx->tx_cwnd)
return 0;
return 1; /* XXX CCID should dequeue when ready instead of polling */
@ -133,7 +133,7 @@ static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
{
struct dccp_sock *dp = dccp_sk(sk);
u32 max_ratio = DIV_ROUND_UP(ccid2_hc_tx_sk(sk)->ccid2hctx_cwnd, 2);
u32 max_ratio = DIV_ROUND_UP(ccid2_hc_tx_sk(sk)->tx_cwnd, 2);
/*
* Ensure that Ack Ratio does not exceed ceil(cwnd/2), which is (2) from
@ -158,7 +158,7 @@ static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
static void ccid2_change_srtt(struct ccid2_hc_tx_sock *hctx, long val)
{
ccid2_pr_debug("change SRTT to %ld\n", val);
hctx->ccid2hctx_srtt = val;
hctx->tx_srtt = val;
}
static void ccid2_start_rto_timer(struct sock *sk);
@ -171,8 +171,7 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
bh_lock_sock(sk);
if (sock_owned_by_user(sk)) {
sk_reset_timer(sk, &hctx->ccid2hctx_rtotimer,
jiffies + HZ / 5);
sk_reset_timer(sk, &hctx->tx_rtotimer, jiffies + HZ / 5);
goto out;
}
@ -181,28 +180,28 @@ static void ccid2_hc_tx_rto_expire(unsigned long data)
ccid2_hc_tx_check_sanity(hctx);
/* back-off timer */
hctx->ccid2hctx_rto <<= 1;
hctx->tx_rto <<= 1;
s = hctx->ccid2hctx_rto / HZ;
s = hctx->tx_rto / HZ;
if (s > 60)
hctx->ccid2hctx_rto = 60 * HZ;
hctx->tx_rto = 60 * HZ;
ccid2_start_rto_timer(sk);
/* adjust pipe, cwnd etc */
hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd / 2;
if (hctx->ccid2hctx_ssthresh < 2)
hctx->ccid2hctx_ssthresh = 2;
hctx->ccid2hctx_cwnd = 1;
hctx->ccid2hctx_pipe = 0;
hctx->tx_ssthresh = hctx->tx_cwnd / 2;
if (hctx->tx_ssthresh < 2)
hctx->tx_ssthresh = 2;
hctx->tx_cwnd = 1;
hctx->tx_pipe = 0;
/* clear state about stuff we sent */
hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh;
hctx->ccid2hctx_packets_acked = 0;
hctx->tx_seqt = hctx->tx_seqh;
hctx->tx_packets_acked = 0;
/* clear ack ratio state. */
hctx->ccid2hctx_rpseq = 0;
hctx->ccid2hctx_rpdupack = -1;
hctx->tx_rpseq = 0;
hctx->tx_rpdupack = -1;
ccid2_change_l_ack_ratio(sk, 1);
ccid2_hc_tx_check_sanity(hctx);
out:
@ -214,11 +213,10 @@ static void ccid2_start_rto_timer(struct sock *sk)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
ccid2_pr_debug("setting RTO timeout=%ld\n", hctx->ccid2hctx_rto);
ccid2_pr_debug("setting RTO timeout=%ld\n", hctx->tx_rto);
BUG_ON(timer_pending(&hctx->ccid2hctx_rtotimer));
sk_reset_timer(sk, &hctx->ccid2hctx_rtotimer,
jiffies + hctx->ccid2hctx_rto);
BUG_ON(timer_pending(&hctx->tx_rtotimer));
sk_reset_timer(sk, &hctx->tx_rtotimer, jiffies + hctx->tx_rto);
}
static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
@ -227,27 +225,26 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
struct ccid2_seq *next;
hctx->ccid2hctx_pipe++;
hctx->tx_pipe++;
hctx->ccid2hctx_seqh->ccid2s_seq = dp->dccps_gss;
hctx->ccid2hctx_seqh->ccid2s_acked = 0;
hctx->ccid2hctx_seqh->ccid2s_sent = jiffies;
hctx->tx_seqh->ccid2s_seq = dp->dccps_gss;
hctx->tx_seqh->ccid2s_acked = 0;
hctx->tx_seqh->ccid2s_sent = jiffies;
next = hctx->ccid2hctx_seqh->ccid2s_next;
next = hctx->tx_seqh->ccid2s_next;
/* check if we need to alloc more space */
if (next == hctx->ccid2hctx_seqt) {
if (next == hctx->tx_seqt) {
if (ccid2_hc_tx_alloc_seq(hctx)) {
DCCP_CRIT("packet history - out of memory!");
/* FIXME: find a more graceful way to bail out */
return;
}
next = hctx->ccid2hctx_seqh->ccid2s_next;
BUG_ON(next == hctx->ccid2hctx_seqt);
next = hctx->tx_seqh->ccid2s_next;
BUG_ON(next == hctx->tx_seqt);
}
hctx->ccid2hctx_seqh = next;
hctx->tx_seqh = next;
ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->ccid2hctx_cwnd,
hctx->ccid2hctx_pipe);
ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->tx_cwnd, hctx->tx_pipe);
/*
* FIXME: The code below is broken and the variables have been removed
@ -270,12 +267,12 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
*/
#if 0
/* Ack Ratio. Need to maintain a concept of how many windows we sent */
hctx->ccid2hctx_arsent++;
hctx->tx_arsent++;
/* We had an ack loss in this window... */
if (hctx->ccid2hctx_ackloss) {
if (hctx->ccid2hctx_arsent >= hctx->ccid2hctx_cwnd) {
hctx->ccid2hctx_arsent = 0;
hctx->ccid2hctx_ackloss = 0;
if (hctx->tx_ackloss) {
if (hctx->tx_arsent >= hctx->tx_cwnd) {
hctx->tx_arsent = 0;
hctx->tx_ackloss = 0;
}
} else {
/* No acks lost up to now... */
@ -285,28 +282,28 @@ static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
int denom = dp->dccps_l_ack_ratio * dp->dccps_l_ack_ratio -
dp->dccps_l_ack_ratio;
denom = hctx->ccid2hctx_cwnd * hctx->ccid2hctx_cwnd / denom;
denom = hctx->tx_cwnd * hctx->tx_cwnd / denom;
if (hctx->ccid2hctx_arsent >= denom) {
if (hctx->tx_arsent >= denom) {
ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio - 1);
hctx->ccid2hctx_arsent = 0;
hctx->tx_arsent = 0;
}
} else {
/* we can't increase ack ratio further [1] */
hctx->ccid2hctx_arsent = 0; /* or maybe set it to cwnd*/
hctx->tx_arsent = 0; /* or maybe set it to cwnd*/
}
}
#endif
/* setup RTO timer */
if (!timer_pending(&hctx->ccid2hctx_rtotimer))
if (!timer_pending(&hctx->tx_rtotimer))
ccid2_start_rto_timer(sk);
#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
do {
struct ccid2_seq *seqp = hctx->ccid2hctx_seqt;
struct ccid2_seq *seqp = hctx->tx_seqt;
while (seqp != hctx->ccid2hctx_seqh) {
while (seqp != hctx->tx_seqh) {
ccid2_pr_debug("out seq=%llu acked=%d time=%lu\n",
(unsigned long long)seqp->ccid2s_seq,
seqp->ccid2s_acked, seqp->ccid2s_sent);
@ -384,7 +381,7 @@ static void ccid2_hc_tx_kill_rto_timer(struct sock *sk)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
sk_stop_timer(sk, &hctx->ccid2hctx_rtotimer);
sk_stop_timer(sk, &hctx->tx_rtotimer);
ccid2_pr_debug("deleted RTO timer\n");
}
@ -394,73 +391,73 @@ static inline void ccid2_new_ack(struct sock *sk,
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
if (hctx->ccid2hctx_cwnd < hctx->ccid2hctx_ssthresh) {
if (*maxincr > 0 && ++hctx->ccid2hctx_packets_acked == 2) {
hctx->ccid2hctx_cwnd += 1;
*maxincr -= 1;
hctx->ccid2hctx_packets_acked = 0;
if (hctx->tx_cwnd < hctx->tx_ssthresh) {
if (*maxincr > 0 && ++hctx->tx_packets_acked == 2) {
hctx->tx_cwnd += 1;
*maxincr -= 1;
hctx->tx_packets_acked = 0;
}
} else if (++hctx->ccid2hctx_packets_acked >= hctx->ccid2hctx_cwnd) {
hctx->ccid2hctx_cwnd += 1;
hctx->ccid2hctx_packets_acked = 0;
} else if (++hctx->tx_packets_acked >= hctx->tx_cwnd) {
hctx->tx_cwnd += 1;
hctx->tx_packets_acked = 0;
}
/* update RTO */
if (hctx->ccid2hctx_srtt == -1 ||
time_after(jiffies, hctx->ccid2hctx_lastrtt + hctx->ccid2hctx_srtt)) {
if (hctx->tx_srtt == -1 ||
time_after(jiffies, hctx->tx_lastrtt + hctx->tx_srtt)) {
unsigned long r = (long)jiffies - (long)seqp->ccid2s_sent;
int s;
/* first measurement */
if (hctx->ccid2hctx_srtt == -1) {
if (hctx->tx_srtt == -1) {
ccid2_pr_debug("R: %lu Time=%lu seq=%llu\n",
r, jiffies,
(unsigned long long)seqp->ccid2s_seq);
ccid2_change_srtt(hctx, r);
hctx->ccid2hctx_rttvar = r >> 1;
hctx->tx_rttvar = r >> 1;
} else {
/* RTTVAR */
long tmp = hctx->ccid2hctx_srtt - r;
long tmp = hctx->tx_srtt - r;
long srtt;
if (tmp < 0)
tmp *= -1;
tmp >>= 2;
hctx->ccid2hctx_rttvar *= 3;
hctx->ccid2hctx_rttvar >>= 2;
hctx->ccid2hctx_rttvar += tmp;
hctx->tx_rttvar *= 3;
hctx->tx_rttvar >>= 2;
hctx->tx_rttvar += tmp;
/* SRTT */
srtt = hctx->ccid2hctx_srtt;
srtt = hctx->tx_srtt;
srtt *= 7;
srtt >>= 3;
tmp = r >> 3;
srtt += tmp;
ccid2_change_srtt(hctx, srtt);
}
s = hctx->ccid2hctx_rttvar << 2;
s = hctx->tx_rttvar << 2;
/* clock granularity is 1 when based on jiffies */
if (!s)
s = 1;
hctx->ccid2hctx_rto = hctx->ccid2hctx_srtt + s;
hctx->tx_rto = hctx->tx_srtt + s;
/* must be at least a second */
s = hctx->ccid2hctx_rto / HZ;
s = hctx->tx_rto / HZ;
/* DCCP doesn't require this [but I like it cuz my code sux] */
#if 1
if (s < 1)
hctx->ccid2hctx_rto = HZ;
hctx->tx_rto = HZ;
#endif
/* max 60 seconds */
if (s > 60)
hctx->ccid2hctx_rto = HZ * 60;
hctx->tx_rto = HZ * 60;
hctx->ccid2hctx_lastrtt = jiffies;
hctx->tx_lastrtt = jiffies;
ccid2_pr_debug("srtt: %ld rttvar: %ld rto: %ld (HZ=%d) R=%lu\n",
hctx->ccid2hctx_srtt, hctx->ccid2hctx_rttvar,
hctx->ccid2hctx_rto, HZ, r);
hctx->tx_srtt, hctx->tx_rttvar,
hctx->tx_rto, HZ, r);
}
/* we got a new ack, so re-start RTO timer */
@ -472,12 +469,12 @@ static void ccid2_hc_tx_dec_pipe(struct sock *sk)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
if (hctx->ccid2hctx_pipe == 0)
if (hctx->tx_pipe == 0)
DCCP_BUG("pipe == 0");
else
hctx->ccid2hctx_pipe--;
hctx->tx_pipe--;
if (hctx->ccid2hctx_pipe == 0)
if (hctx->tx_pipe == 0)
ccid2_hc_tx_kill_rto_timer(sk);
}
@ -485,19 +482,19 @@ static void ccid2_congestion_event(struct sock *sk, struct ccid2_seq *seqp)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
if (time_before(seqp->ccid2s_sent, hctx->ccid2hctx_last_cong)) {
if (time_before(seqp->ccid2s_sent, hctx->tx_last_cong)) {
ccid2_pr_debug("Multiple losses in an RTT---treating as one\n");
return;
}
hctx->ccid2hctx_last_cong = jiffies;
hctx->tx_last_cong = jiffies;
hctx->ccid2hctx_cwnd = hctx->ccid2hctx_cwnd / 2 ? : 1U;
hctx->ccid2hctx_ssthresh = max(hctx->ccid2hctx_cwnd, 2U);
hctx->tx_cwnd = hctx->tx_cwnd / 2 ? : 1U;
hctx->tx_ssthresh = max(hctx->tx_cwnd, 2U);
/* Avoid spurious timeouts resulting from Ack Ratio > cwnd */
if (dccp_sk(sk)->dccps_l_ack_ratio > hctx->ccid2hctx_cwnd)
ccid2_change_l_ack_ratio(sk, hctx->ccid2hctx_cwnd);
if (dccp_sk(sk)->dccps_l_ack_ratio > hctx->tx_cwnd)
ccid2_change_l_ack_ratio(sk, hctx->tx_cwnd);
}
static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
@ -521,21 +518,21 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
* -sorbo.
*/
/* need to bootstrap */
if (hctx->ccid2hctx_rpdupack == -1) {
hctx->ccid2hctx_rpdupack = 0;
hctx->ccid2hctx_rpseq = seqno;
if (hctx->tx_rpdupack == -1) {
hctx->tx_rpdupack = 0;
hctx->tx_rpseq = seqno;
} else {
/* check if packet is consecutive */
if (dccp_delta_seqno(hctx->ccid2hctx_rpseq, seqno) == 1)
hctx->ccid2hctx_rpseq = seqno;
if (dccp_delta_seqno(hctx->tx_rpseq, seqno) == 1)
hctx->tx_rpseq = seqno;
/* it's a later packet */
else if (after48(seqno, hctx->ccid2hctx_rpseq)) {
hctx->ccid2hctx_rpdupack++;
else if (after48(seqno, hctx->tx_rpseq)) {
hctx->tx_rpdupack++;
/* check if we got enough dupacks */
if (hctx->ccid2hctx_rpdupack >= NUMDUPACK) {
hctx->ccid2hctx_rpdupack = -1; /* XXX lame */
hctx->ccid2hctx_rpseq = 0;
if (hctx->tx_rpdupack >= NUMDUPACK) {
hctx->tx_rpdupack = -1; /* XXX lame */
hctx->tx_rpseq = 0;
ccid2_change_l_ack_ratio(sk, 2 * dp->dccps_l_ack_ratio);
}
@ -544,7 +541,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
/* check forward path congestion */
/* still didn't send out new data packets */
if (hctx->ccid2hctx_seqh == hctx->ccid2hctx_seqt)
if (hctx->tx_seqh == hctx->tx_seqt)
return;
switch (DCCP_SKB_CB(skb)->dccpd_type) {
@ -556,14 +553,14 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
}
ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
if (after48(ackno, hctx->ccid2hctx_high_ack))
hctx->ccid2hctx_high_ack = ackno;
if (after48(ackno, hctx->tx_high_ack))
hctx->tx_high_ack = ackno;
seqp = hctx->ccid2hctx_seqt;
seqp = hctx->tx_seqt;
while (before48(seqp->ccid2s_seq, ackno)) {
seqp = seqp->ccid2s_next;
if (seqp == hctx->ccid2hctx_seqh) {
seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
if (seqp == hctx->tx_seqh) {
seqp = hctx->tx_seqh->ccid2s_prev;
break;
}
}
@ -573,7 +570,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
* packets per acknowledgement. Rounding up avoids that cwnd is not
* advanced when Ack Ratio is 1 and gives a slight edge otherwise.
*/
if (hctx->ccid2hctx_cwnd < hctx->ccid2hctx_ssthresh)
if (hctx->tx_cwnd < hctx->tx_ssthresh)
maxincr = DIV_ROUND_UP(dp->dccps_l_ack_ratio, 2);
/* go through all ack vectors */
@ -592,7 +589,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
* seqnos.
*/
while (after48(seqp->ccid2s_seq, ackno)) {
if (seqp == hctx->ccid2hctx_seqt) {
if (seqp == hctx->tx_seqt) {
done = 1;
break;
}
@ -624,7 +621,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
(unsigned long long)seqp->ccid2s_seq);
ccid2_hc_tx_dec_pipe(sk);
}
if (seqp == hctx->ccid2hctx_seqt) {
if (seqp == hctx->tx_seqt) {
done = 1;
break;
}
@ -643,11 +640,11 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
/* The state about what is acked should be correct now
* Check for NUMDUPACK
*/
seqp = hctx->ccid2hctx_seqt;
while (before48(seqp->ccid2s_seq, hctx->ccid2hctx_high_ack)) {
seqp = hctx->tx_seqt;
while (before48(seqp->ccid2s_seq, hctx->tx_high_ack)) {
seqp = seqp->ccid2s_next;
if (seqp == hctx->ccid2hctx_seqh) {
seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
if (seqp == hctx->tx_seqh) {
seqp = hctx->tx_seqh->ccid2s_prev;
break;
}
}
@ -658,7 +655,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
if (done == NUMDUPACK)
break;
}
if (seqp == hctx->ccid2hctx_seqt)
if (seqp == hctx->tx_seqt)
break;
seqp = seqp->ccid2s_prev;
}
@ -681,20 +678,20 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
ccid2_congestion_event(sk, seqp);
ccid2_hc_tx_dec_pipe(sk);
}
if (seqp == hctx->ccid2hctx_seqt)
if (seqp == hctx->tx_seqt)
break;
seqp = seqp->ccid2s_prev;
}
hctx->ccid2hctx_seqt = last_acked;
hctx->tx_seqt = last_acked;
}
/* trim acked packets in tail */
while (hctx->ccid2hctx_seqt != hctx->ccid2hctx_seqh) {
if (!hctx->ccid2hctx_seqt->ccid2s_acked)
while (hctx->tx_seqt != hctx->tx_seqh) {
if (!hctx->tx_seqt->ccid2s_acked)
break;
hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqt->ccid2s_next;
hctx->tx_seqt = hctx->tx_seqt->ccid2s_next;
}
ccid2_hc_tx_check_sanity(hctx);
@ -707,17 +704,17 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
u32 max_ratio;
/* RFC 4341, 5: initialise ssthresh to arbitrarily high (max) value */
hctx->ccid2hctx_ssthresh = ~0U;
hctx->tx_ssthresh = ~0U;
/*
* RFC 4341, 5: "The cwnd parameter is initialized to at most four
* packets for new connections, following the rules from [RFC3390]".
* We need to convert the bytes of RFC3390 into the packets of RFC 4341.
*/
hctx->ccid2hctx_cwnd = clamp(4380U / dp->dccps_mss_cache, 2U, 4U);
hctx->tx_cwnd = clamp(4380U / dp->dccps_mss_cache, 2U, 4U);
/* Make sure that Ack Ratio is enabled and within bounds. */
max_ratio = DIV_ROUND_UP(hctx->ccid2hctx_cwnd, 2);
max_ratio = DIV_ROUND_UP(hctx->tx_cwnd, 2);
if (dp->dccps_l_ack_ratio == 0 || dp->dccps_l_ack_ratio > max_ratio)
dp->dccps_l_ack_ratio = max_ratio;
@ -725,12 +722,12 @@ static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
if (ccid2_hc_tx_alloc_seq(hctx))
return -ENOMEM;
hctx->ccid2hctx_rto = 3 * HZ;
hctx->tx_rto = 3 * HZ;
ccid2_change_srtt(hctx, -1);
hctx->ccid2hctx_rttvar = -1;
hctx->ccid2hctx_rpdupack = -1;
hctx->ccid2hctx_last_cong = jiffies;
setup_timer(&hctx->ccid2hctx_rtotimer, ccid2_hc_tx_rto_expire,
hctx->tx_rttvar = -1;
hctx->tx_rpdupack = -1;
hctx->tx_last_cong = jiffies;
setup_timer(&hctx->tx_rtotimer, ccid2_hc_tx_rto_expire,
(unsigned long)sk);
ccid2_hc_tx_check_sanity(hctx);
@ -744,9 +741,9 @@ static void ccid2_hc_tx_exit(struct sock *sk)
ccid2_hc_tx_kill_rto_timer(sk);
for (i = 0; i < hctx->ccid2hctx_seqbufc; i++)
kfree(hctx->ccid2hctx_seqbuf[i]);
hctx->ccid2hctx_seqbufc = 0;
for (i = 0; i < hctx->tx_seqbufc; i++)
kfree(hctx->tx_seqbuf[i]);
hctx->tx_seqbufc = 0;
}
static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
@ -757,10 +754,10 @@ static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
switch (DCCP_SKB_CB(skb)->dccpd_type) {
case DCCP_PKT_DATA:
case DCCP_PKT_DATAACK:
hcrx->ccid2hcrx_data++;
if (hcrx->ccid2hcrx_data >= dp->dccps_r_ack_ratio) {
hcrx->rx_data++;
if (hcrx->rx_data >= dp->dccps_r_ack_ratio) {
dccp_send_ack(sk);
hcrx->ccid2hcrx_data = 0;
hcrx->rx_data = 0;
}
break;
}

46
net/dccp/ccids/ccid2.h
View file

@ -40,34 +40,34 @@ struct ccid2_seq {
/**
* struct ccid2_hc_tx_sock - CCID2 TX half connection
* @ccid2hctx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
* @ccid2hctx_packets_acked - Ack counter for deriving cwnd growth (RFC 3465)
* @ccid2hctx_lastrtt -time RTT was last measured
* @ccid2hctx_rpseq - last consecutive seqno
* @ccid2hctx_rpdupack - dupacks since rpseq
* @tx_{cwnd,ssthresh,pipe}: as per RFC 4341, section 5
* @tx_packets_acked: Ack counter for deriving cwnd growth (RFC 3465)
* @tx_lastrtt: time RTT was last measured
* @tx_rpseq: last consecutive seqno
* @tx_rpdupack: dupacks since rpseq
*/
struct ccid2_hc_tx_sock {
u32 ccid2hctx_cwnd;
u32 ccid2hctx_ssthresh;
u32 ccid2hctx_pipe;
u32 ccid2hctx_packets_acked;
struct ccid2_seq *ccid2hctx_seqbuf[CCID2_SEQBUF_MAX];
int ccid2hctx_seqbufc;
struct ccid2_seq *ccid2hctx_seqh;
struct ccid2_seq *ccid2hctx_seqt;
long ccid2hctx_rto;
long ccid2hctx_srtt;
long ccid2hctx_rttvar;
unsigned long ccid2hctx_lastrtt;
struct timer_list ccid2hctx_rtotimer;
u64 ccid2hctx_rpseq;
int ccid2hctx_rpdupack;
unsigned long ccid2hctx_last_cong;
u64 ccid2hctx_high_ack;
u32 tx_cwnd;
u32 tx_ssthresh;
u32 tx_pipe;
u32 tx_packets_acked;
struct ccid2_seq *tx_seqbuf[CCID2_SEQBUF_MAX];
int tx_seqbufc;
struct ccid2_seq *tx_seqh;
struct ccid2_seq *tx_seqt;
long tx_rto;
long tx_srtt;
long tx_rttvar;
unsigned long tx_lastrtt;
struct timer_list tx_rtotimer;
u64 tx_rpseq;
int tx_rpdupack;
unsigned long tx_last_cong;
u64 tx_high_ack;
};
struct ccid2_hc_rx_sock {
int ccid2hcrx_data;
int rx_data;
};
static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)