*/
/*
- * This implementation should follow: draft-ietf-dccp-ccid2-10.txt
+ * This implementation should follow RFC 4341
*
* BUGS:
* - sequence number wrapping
- * - jiffies wrapping
*/
-#include <linux/config.h>
#include "../ccid.h"
#include "../dccp.h"
#include "ccid2.h"
-static int ccid2_debug;
-
-#if 0
-#define CCID2_DEBUG
-#endif
-
-#ifdef CCID2_DEBUG
-#define ccid2_pr_debug(format, a...) \
- do { if (ccid2_debug) \
- printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
- } while (0)
-#else
-#define ccid2_pr_debug(format, a...)
-#endif
-
-static const int ccid2_seq_len = 128;
-static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
-{
- return dccp_sk(sk)->dccps_hc_tx_ccid_private;
-}
-
-static inline struct ccid2_hc_rx_sock *ccid2_hc_rx_sk(const struct sock *sk)
-{
- return dccp_sk(sk)->dccps_hc_rx_ccid_private;
-}
+#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
+static int ccid2_debug;
+#define ccid2_pr_debug(format, a...) DCCP_PR_DEBUG(ccid2_debug, format, ##a)
-#ifdef CCID2_DEBUG
static void ccid2_hc_tx_check_sanity(const struct ccid2_hc_tx_sock *hctx)
{
int len = 0;
- struct ccid2_seq *seqp;
int pipe = 0;
-
- seqp = hctx->ccid2hctx_seqh;
+ struct ccid2_seq *seqp = hctx->ccid2hctx_seqh;
/* there is data in the chain */
if (seqp != hctx->ccid2hctx_seqt) {
pipe++;
while (seqp != hctx->ccid2hctx_seqt) {
- struct ccid2_seq *prev;
+ struct ccid2_seq *prev = seqp->ccid2s_prev;
- prev = seqp->ccid2s_prev;
len++;
if (!prev->ccid2s_acked)
pipe++;
/* packets are sent sequentially */
BUG_ON(seqp->ccid2s_seq <= prev->ccid2s_seq);
- BUG_ON(seqp->ccid2s_sent < prev->ccid2s_sent);
- BUG_ON(len > ccid2_seq_len);
+ BUG_ON(time_before(seqp->ccid2s_sent,
+ prev->ccid2s_sent));
seqp = prev;
}
do {
seqp = seqp->ccid2s_prev;
len++;
- BUG_ON(len > ccid2_seq_len);
- } while(seqp != hctx->ccid2hctx_seqh);
+ } while (seqp != hctx->ccid2hctx_seqh);
- BUG_ON(len != ccid2_seq_len);
ccid2_pr_debug("total len=%d\n", len);
+ BUG_ON(len != hctx->ccid2hctx_seqbufc * CCID2_SEQBUF_LEN);
}
#else
-#define ccid2_hc_tx_check_sanity(hctx) do {} while (0)
+#define ccid2_pr_debug(format, a...)
+#define ccid2_hc_tx_check_sanity(hctx)
#endif
-static int ccid2_hc_tx_send_packet(struct sock *sk,
- struct sk_buff *skb, int len)
+static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx, int num,
+ gfp_t gfp)
+{
+ struct ccid2_seq *seqp;
+ 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*)))
+ return -ENOMEM;
+
+ /* allocate buffer and initialize linked list */
+ seqp = kmalloc(sizeof(*seqp) * num, gfp);
+ if (seqp == NULL)
+ return -ENOMEM;
+
+ for (i = 0; i < (num - 1); i++) {
+ seqp[i].ccid2s_next = &seqp[i + 1];
+ seqp[i + 1].ccid2s_prev = &seqp[i];
+ }
+ seqp[num - 1].ccid2s_next = seqp;
+ seqp->ccid2s_prev = &seqp[num - 1];
+
+ /* This is the first allocation. Initiate the head and tail. */
+ if (hctx->ccid2hctx_seqbufc == 0)
+ hctx->ccid2hctx_seqh = hctx->ccid2hctx_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->ccid2hctx_seqt->ccid2s_prev = &seqp[num - 1];
+ seqp[num - 1].ccid2s_next = hctx->ccid2hctx_seqt;
+ }
+
+ /* store the original pointer to the buffer so we can free it */
+ hctx->ccid2hctx_seqbuf[hctx->ccid2hctx_seqbufc] = seqp;
+ hctx->ccid2hctx_seqbufc++;
+
+ return 0;
+}
+
+static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
{
struct ccid2_hc_tx_sock *hctx;
return 0;
}
- hctx = ccid2_hc_tx_sk(sk);
+ hctx = ccid2_hc_tx_sk(sk);
ccid2_pr_debug("pipe=%d cwnd=%d\n", hctx->ccid2hctx_pipe,
hctx->ccid2hctx_cwnd);
}
}
- return 100; /* XXX */
+ return 1; /* XXX CCID should dequeue when ready instead of polling */
}
static void ccid2_change_l_ack_ratio(struct sock *sk, int val)
* -sorbo.
*/
if (val != 2) {
- struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+ const struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
int max = hctx->ccid2hctx_cwnd / 2;
/* round up */
dp->dccps_l_ack_ratio = val;
}
-static void ccid2_change_cwnd(struct sock *sk, int val)
+static void ccid2_change_cwnd(struct ccid2_hc_tx_sock *hctx, int val)
{
- struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
-
if (val == 0)
val = 1;
hctx->ccid2hctx_cwnd = 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;
+}
+
+static void ccid2_change_pipe(struct ccid2_hc_tx_sock *hctx, long val)
+{
+ hctx->ccid2hctx_pipe = val;
+}
+
static void ccid2_start_rto_timer(struct sock *sk);
static void ccid2_hc_tx_rto_expire(unsigned long data)
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
long s;
- /* XXX I don't think i'm locking correctly
- * -sorbo.
- */
bh_lock_sock(sk);
if (sock_owned_by_user(sk)) {
sk_reset_timer(sk, &hctx->ccid2hctx_rtotimer,
ccid2_start_rto_timer(sk);
/* adjust pipe, cwnd etc */
- hctx->ccid2hctx_pipe = 0;
+ ccid2_change_pipe(hctx, 0);
hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd >> 1;
if (hctx->ccid2hctx_ssthresh < 2)
hctx->ccid2hctx_ssthresh = 2;
- ccid2_change_cwnd(sk, 1);
+ ccid2_change_cwnd(hctx, 1);
/* clear state about stuff we sent */
hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh;
ccid2_hc_tx_check_sanity(hctx);
out:
bh_unlock_sock(sk);
-/* sock_put(sk); */
+ sock_put(sk);
}
static void ccid2_start_rto_timer(struct sock *sk)
jiffies + hctx->ccid2hctx_rto);
}
-static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, int len)
+static void ccid2_hc_tx_packet_sent(struct sock *sk, int more, unsigned int len)
{
struct dccp_sock *dp = dccp_sk(sk);
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+ struct ccid2_seq *next;
u64 seq;
ccid2_hc_tx_check_sanity(hctx);
BUG_ON(!hctx->ccid2hctx_sendwait);
hctx->ccid2hctx_sendwait = 0;
- hctx->ccid2hctx_pipe++;
+ ccid2_change_pipe(hctx, hctx->ccid2hctx_pipe + 1);
BUG_ON(hctx->ccid2hctx_pipe < 0);
/* There is an issue. What if another packet is sent between
hctx->ccid2hctx_seqh->ccid2s_seq = seq;
hctx->ccid2hctx_seqh->ccid2s_acked = 0;
hctx->ccid2hctx_seqh->ccid2s_sent = jiffies;
- hctx->ccid2hctx_seqh = hctx->ccid2hctx_seqh->ccid2s_next;
- ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->ccid2hctx_cwnd,
- hctx->ccid2hctx_pipe);
+ next = hctx->ccid2hctx_seqh->ccid2s_next;
+ /* check if we need to alloc more space */
+ if (next == hctx->ccid2hctx_seqt) {
+ int rc;
- if (hctx->ccid2hctx_seqh == hctx->ccid2hctx_seqt) {
- /* XXX allocate more space */
- WARN_ON(1);
+ ccid2_pr_debug("allocating more space in history\n");
+ rc = ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, GFP_KERNEL);
+ BUG_ON(rc); /* XXX what do we do? */
+
+ next = hctx->ccid2hctx_seqh->ccid2s_next;
+ BUG_ON(next == hctx->ccid2hctx_seqt);
}
+ hctx->ccid2hctx_seqh = next;
+
+ ccid2_pr_debug("cwnd=%d pipe=%d\n", hctx->ccid2hctx_cwnd,
+ hctx->ccid2hctx_pipe);
hctx->ccid2hctx_sent++;
/* 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;
+ hctx->ccid2hctx_arsent = 0;
+ hctx->ccid2hctx_ackloss = 0;
}
- }
- /* No acks lost up to now... */
- else {
+ } else {
+ /* No acks lost up to now... */
/* decrease ack ratio if enough packets were sent */
if (dp->dccps_l_ack_ratio > 1) {
/* XXX don't calculate denominator each time */
- int denom;
+ int denom = dp->dccps_l_ack_ratio * dp->dccps_l_ack_ratio -
+ dp->dccps_l_ack_ratio;
- denom = dp->dccps_l_ack_ratio * dp->dccps_l_ack_ratio -
- dp->dccps_l_ack_ratio;
denom = hctx->ccid2hctx_cwnd * hctx->ccid2hctx_cwnd / denom;
if (hctx->ccid2hctx_arsent >= denom) {
ccid2_change_l_ack_ratio(sk, dp->dccps_l_ack_ratio - 1);
hctx->ccid2hctx_arsent = 0;
}
- }
- /* we can't increase ack ratio further [1] */
- else {
+ } else {
+ /* we can't increase ack ratio further [1] */
hctx->ccid2hctx_arsent = 0; /* or maybe set it to cwnd*/
}
}
/* setup RTO timer */
- if (!timer_pending(&hctx->ccid2hctx_rtotimer)) {
+ if (!timer_pending(&hctx->ccid2hctx_rtotimer))
ccid2_start_rto_timer(sk);
- }
-#ifdef CCID2_DEBUG
+
+#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
ccid2_pr_debug("pipe=%d\n", hctx->ccid2hctx_pipe);
- ccid2_pr_debug("Sent: seq=%llu\n", seq);
+ ccid2_pr_debug("Sent: seq=%llu\n", (unsigned long long)seq);
do {
struct ccid2_seq *seqp = hctx->ccid2hctx_seqt;
while (seqp != hctx->ccid2hctx_seqh) {
ccid2_pr_debug("out seq=%llu acked=%d time=%lu\n",
- seqp->ccid2s_seq, seqp->ccid2s_acked,
- seqp->ccid2s_sent);
+ (unsigned long long)seqp->ccid2s_seq,
+ seqp->ccid2s_acked, seqp->ccid2s_sent);
seqp = seqp->ccid2s_next;
}
- } while(0);
+ } while (0);
ccid2_pr_debug("=========\n");
ccid2_hc_tx_check_sanity(hctx);
#endif
static int ccid2_ackvector(struct sock *sk, struct sk_buff *skb, int offset,
unsigned char **vec, unsigned char *veclen)
{
- const struct dccp_hdr *dh = dccp_hdr(skb);
- unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
- unsigned char *opt_ptr;
- const unsigned char *opt_end = (unsigned char *)dh +
- (dh->dccph_doff * 4);
- unsigned char opt, len;
- unsigned char *value;
+ const struct dccp_hdr *dh = dccp_hdr(skb);
+ unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
+ unsigned char *opt_ptr;
+ const unsigned char *opt_end = (unsigned char *)dh +
+ (dh->dccph_doff * 4);
+ unsigned char opt, len;
+ unsigned char *value;
BUG_ON(offset < 0);
options += offset;
return -1;
while (opt_ptr != opt_end) {
- opt = *opt_ptr++;
- len = 0;
- value = NULL;
-
- /* Check if this isn't a single byte option */
- if (opt > DCCPO_MAX_RESERVED) {
- if (opt_ptr == opt_end)
- goto out_invalid_option;
-
- len = *opt_ptr++;
- if (len < 3)
- goto out_invalid_option;
- /*
- * Remove the type and len fields, leaving
- * just the value size
- */
- len -= 2;
- value = opt_ptr;
- opt_ptr += len;
-
- if (opt_ptr > opt_end)
- goto out_invalid_option;
- }
+ opt = *opt_ptr++;
+ len = 0;
+ value = NULL;
+
+ /* Check if this isn't a single byte option */
+ if (opt > DCCPO_MAX_RESERVED) {
+ if (opt_ptr == opt_end)
+ goto out_invalid_option;
+
+ len = *opt_ptr++;
+ if (len < 3)
+ goto out_invalid_option;
+ /*
+ * Remove the type and len fields, leaving
+ * just the value size
+ */
+ len -= 2;
+ value = opt_ptr;
+ opt_ptr += len;
+
+ if (opt_ptr > opt_end)
+ goto out_invalid_option;
+ }
switch (opt) {
case DCCPO_ACK_VECTOR_0:
*vec = value;
*veclen = len;
return offset + (opt_ptr - options);
- break;
}
}
return -1;
out_invalid_option:
- BUG_ON(1); /* should never happen... options were previously parsed ! */
+ DCCP_BUG("Invalid option - this should not happen (previous parsing)!");
return -1;
}
-static void ccid2_hc_tx_kill_rto_timer(struct ccid2_hc_tx_sock *hctx)
+static void ccid2_hc_tx_kill_rto_timer(struct sock *sk)
{
- if (del_timer(&hctx->ccid2hctx_rtotimer))
- ccid2_pr_debug("deleted RTO timer\n");
+ struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+
+ sk_stop_timer(sk, &hctx->ccid2hctx_rtotimer);
+ ccid2_pr_debug("deleted RTO timer\n");
}
static inline void ccid2_new_ack(struct sock *sk,
- struct ccid2_seq *seqp,
+ struct ccid2_seq *seqp,
unsigned int *maxincr)
{
struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
/* increase every 2 acks */
hctx->ccid2hctx_ssacks++;
if (hctx->ccid2hctx_ssacks == 2) {
- ccid2_change_cwnd(sk, hctx->ccid2hctx_cwnd + 1);
+ ccid2_change_cwnd(hctx, hctx->ccid2hctx_cwnd+1);
hctx->ccid2hctx_ssacks = 0;
*maxincr = *maxincr - 1;
}
- }
- /* increased cwnd enough for this single ack */
- else {
+ } else {
+ /* increased cwnd enough for this single ack */
hctx->ccid2hctx_ssacks = 0;
}
- }
- else {
+ } else {
hctx->ccid2hctx_ssacks = 0;
hctx->ccid2hctx_acks++;
if (hctx->ccid2hctx_acks >= hctx->ccid2hctx_cwnd) {
- ccid2_change_cwnd(sk, hctx->ccid2hctx_cwnd + 1);
+ ccid2_change_cwnd(hctx, hctx->ccid2hctx_cwnd + 1);
hctx->ccid2hctx_acks = 0;
}
}
/* update RTO */
if (hctx->ccid2hctx_srtt == -1 ||
- (jiffies - hctx->ccid2hctx_lastrtt) >= hctx->ccid2hctx_srtt) {
- unsigned long r = jiffies - seqp->ccid2s_sent;
+ time_after(jiffies, hctx->ccid2hctx_lastrtt + hctx->ccid2hctx_srtt)) {
+ unsigned long r = (long)jiffies - (long)seqp->ccid2s_sent;
int s;
/* first measurement */
if (hctx->ccid2hctx_srtt == -1) {
ccid2_pr_debug("R: %lu Time=%lu seq=%llu\n",
- r, jiffies, seqp->ccid2s_seq);
- hctx->ccid2hctx_srtt = r;
+ r, jiffies,
+ (unsigned long long)seqp->ccid2s_seq);
+ ccid2_change_srtt(hctx, r);
hctx->ccid2hctx_rttvar = r >> 1;
- }
- else {
+ } else {
/* RTTVAR */
long tmp = hctx->ccid2hctx_srtt - r;
+ long srtt;
+
if (tmp < 0)
tmp *= -1;
hctx->ccid2hctx_rttvar += tmp;
/* SRTT */
- hctx->ccid2hctx_srtt *= 7;
- hctx->ccid2hctx_srtt >>= 3;
+ srtt = hctx->ccid2hctx_srtt;
+ srtt *= 7;
+ srtt >>= 3;
tmp = r >> 3;
- hctx->ccid2hctx_srtt += tmp;
+ srtt += tmp;
+ ccid2_change_srtt(hctx, srtt);
}
s = hctx->ccid2hctx_rttvar << 2;
/* clock granularity is 1 when based on jiffies */
hctx->ccid2hctx_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->ccid2hctx_srtt, hctx->ccid2hctx_rttvar,
+ hctx->ccid2hctx_rto, HZ, r);
hctx->ccid2hctx_sent = 0;
}
/* we got a new ack, so re-start RTO timer */
- ccid2_hc_tx_kill_rto_timer(hctx);
+ ccid2_hc_tx_kill_rto_timer(sk);
ccid2_start_rto_timer(sk);
}
-static void ccid2_hc_tx_dec_pipe(struct ccid2_hc_tx_sock *hctx)
+static void ccid2_hc_tx_dec_pipe(struct sock *sk)
{
- hctx->ccid2hctx_pipe--;
+ struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+
+ ccid2_change_pipe(hctx, hctx->ccid2hctx_pipe-1);
BUG_ON(hctx->ccid2hctx_pipe < 0);
if (hctx->ccid2hctx_pipe == 0)
- ccid2_hc_tx_kill_rto_timer(hctx);
+ ccid2_hc_tx_kill_rto_timer(sk);
+}
+
+static void ccid2_congestion_event(struct ccid2_hc_tx_sock *hctx,
+ struct ccid2_seq *seqp)
+{
+ if (time_before(seqp->ccid2s_sent, hctx->ccid2hctx_last_cong)) {
+ ccid2_pr_debug("Multiple losses in an RTT---treating as one\n");
+ return;
+ }
+
+ hctx->ccid2hctx_last_cong = jiffies;
+
+ ccid2_change_cwnd(hctx, hctx->ccid2hctx_cwnd >> 1);
+ hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd;
+ if (hctx->ccid2hctx_ssthresh < 2)
+ hctx->ccid2hctx_ssthresh = 2;
}
static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
unsigned char veclen;
int offset = 0;
int done = 0;
- int loss = 0;
unsigned int maxincr = 0;
ccid2_hc_tx_check_sanity(hctx);
if (hctx->ccid2hctx_rpdupack == -1) {
hctx->ccid2hctx_rpdupack = 0;
hctx->ccid2hctx_rpseq = seqno;
- }
- else {
+ } else {
/* check if packet is consecutive */
- if ((hctx->ccid2hctx_rpseq + 1) == seqno) {
+ if ((hctx->ccid2hctx_rpseq + 1) == seqno)
hctx->ccid2hctx_rpseq++;
- }
/* it's a later packet */
else if (after48(seqno, hctx->ccid2hctx_rpseq)) {
hctx->ccid2hctx_rpdupack++;
/* check if we got enough dupacks */
if (hctx->ccid2hctx_rpdupack >=
hctx->ccid2hctx_numdupack) {
-
hctx->ccid2hctx_rpdupack = -1; /* XXX lame */
hctx->ccid2hctx_rpseq = 0;
case DCCP_PKT_ACK:
case DCCP_PKT_DATAACK:
break;
-
default:
return;
}
ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
- seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
+ if (after48(ackno, hctx->ccid2hctx_high_ack))
+ hctx->ccid2hctx_high_ack = ackno;
+
+ seqp = hctx->ccid2hctx_seqt;
+ while (before48(seqp->ccid2s_seq, ackno)) {
+ seqp = seqp->ccid2s_next;
+ if (seqp == hctx->ccid2hctx_seqh) {
+ seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
+ break;
+ }
+ }
/* If in slow-start, cwnd can increase at most Ack Ratio / 2 packets for
* this single ack. I round up.
u64 ackno_end_rl;
dccp_set_seqno(&ackno_end_rl, ackno - rl);
- ccid2_pr_debug("ackvec start:%llu end:%llu\n", ackno,
- ackno_end_rl);
+ ccid2_pr_debug("ackvec start:%llu end:%llu\n",
+ (unsigned long long)ackno,
+ (unsigned long long)ackno_end_rl);
/* if the seqno we are analyzing is larger than the
* current ackno, then move towards the tail of our
* seqnos.
* run length
*/
while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) {
- const u8 state = (*vector &
- DCCP_ACKVEC_STATE_MASK) >> 6;
+ const u8 state = *vector &
+ DCCP_ACKVEC_STATE_MASK;
/* new packet received or marked */
if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED &&
!seqp->ccid2s_acked) {
- if (state ==
+ if (state ==
DCCP_ACKVEC_STATE_ECN_MARKED) {
- loss = 1;
- }
- else {
+ ccid2_congestion_event(hctx,
+ seqp);
+ } else
ccid2_new_ack(sk, seqp,
&maxincr);
- }
seqp->ccid2s_acked = 1;
ccid2_pr_debug("Got ack for %llu\n",
- seqp->ccid2s_seq);
- ccid2_hc_tx_dec_pipe(hctx);
+ (unsigned long long)seqp->ccid2s_seq);
+ ccid2_hc_tx_dec_pipe(sk);
}
if (seqp == hctx->ccid2hctx_seqt) {
done = 1;
/* The state about what is acked should be correct now
* Check for NUMDUPACK
*/
- seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
+ seqp = hctx->ccid2hctx_seqt;
+ while (before48(seqp->ccid2s_seq, hctx->ccid2hctx_high_ack)) {
+ seqp = seqp->ccid2s_next;
+ if (seqp == hctx->ccid2hctx_seqh) {
+ seqp = hctx->ccid2hctx_seqh->ccid2s_prev;
+ break;
+ }
+ }
done = 0;
while (1) {
if (seqp->ccid2s_acked) {
done++;
- if (done == hctx->ccid2hctx_numdupack) {
+ if (done == hctx->ccid2hctx_numdupack)
break;
- }
}
- if (seqp == hctx->ccid2hctx_seqt) {
+ if (seqp == hctx->ccid2hctx_seqt)
break;
- }
seqp = seqp->ccid2s_prev;
}
/* check for lost packets */
while (1) {
if (!seqp->ccid2s_acked) {
- loss = 1;
- ccid2_hc_tx_dec_pipe(hctx);
+ ccid2_pr_debug("Packet lost: %llu\n",
+ (unsigned long long)seqp->ccid2s_seq);
+ /* XXX need to traverse from tail -> head in
+ * order to detect multiple congestion events in
+ * one ack vector.
+ */
+ ccid2_congestion_event(hctx, seqp);
+ ccid2_hc_tx_dec_pipe(sk);
}
if (seqp == hctx->ccid2hctx_seqt)
break;
hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqt->ccid2s_next;
}
- if (loss) {
- /* XXX do bit shifts guarantee a 0 as the new bit? */
- ccid2_change_cwnd(sk, hctx->ccid2hctx_cwnd >> 1);
- hctx->ccid2hctx_ssthresh = hctx->ccid2hctx_cwnd;
- if (hctx->ccid2hctx_ssthresh < 2)
- hctx->ccid2hctx_ssthresh = 2;
- }
-
ccid2_hc_tx_check_sanity(hctx);
}
-static int ccid2_hc_tx_init(struct sock *sk)
+static int ccid2_hc_tx_init(struct ccid *ccid, struct sock *sk)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid2_hc_tx_sock *hctx;
- int seqcount = ccid2_seq_len;
- int i;
-
- dp->dccps_hc_tx_ccid_private = kzalloc(sizeof(*hctx), gfp_any());
- if (dp->dccps_hc_tx_ccid_private == NULL)
- return -ENOMEM;
-
- hctx = ccid2_hc_tx_sk(sk);
+ struct ccid2_hc_tx_sock *hctx = ccid_priv(ccid);
- /* XXX init variables with proper values */
- hctx->ccid2hctx_cwnd = 1;
- hctx->ccid2hctx_ssthresh = 10;
+ ccid2_change_cwnd(hctx, 1);
+ /* Initialize ssthresh to infinity. This means that we will exit the
+ * initial slow-start after the first packet loss. This is what we
+ * want.
+ */
+ hctx->ccid2hctx_ssthresh = ~0;
hctx->ccid2hctx_numdupack = 3;
+ hctx->ccid2hctx_seqbufc = 0;
/* XXX init ~ to window size... */
- hctx->ccid2hctx_seqbuf = kmalloc(sizeof(*hctx->ccid2hctx_seqbuf) *
- seqcount, gfp_any());
- if (hctx->ccid2hctx_seqbuf == NULL) {
- kfree(dp->dccps_hc_tx_ccid_private);
- dp->dccps_hc_tx_ccid_private = NULL;
+ if (ccid2_hc_tx_alloc_seq(hctx, CCID2_SEQBUF_LEN, GFP_ATOMIC) != 0)
return -ENOMEM;
- }
- for (i = 0; i < (seqcount - 1); i++) {
- hctx->ccid2hctx_seqbuf[i].ccid2s_next =
- &hctx->ccid2hctx_seqbuf[i + 1];
- hctx->ccid2hctx_seqbuf[i + 1].ccid2s_prev =
- &hctx->ccid2hctx_seqbuf[i];
- }
- hctx->ccid2hctx_seqbuf[seqcount - 1].ccid2s_next =
- hctx->ccid2hctx_seqbuf;
- hctx->ccid2hctx_seqbuf->ccid2s_prev =
- &hctx->ccid2hctx_seqbuf[seqcount - 1];
- hctx->ccid2hctx_seqh = hctx->ccid2hctx_seqbuf;
- hctx->ccid2hctx_seqt = hctx->ccid2hctx_seqh;
hctx->ccid2hctx_sent = 0;
hctx->ccid2hctx_rto = 3 * HZ;
- hctx->ccid2hctx_srtt = -1;
+ ccid2_change_srtt(hctx, -1);
hctx->ccid2hctx_rttvar = -1;
hctx->ccid2hctx_lastrtt = 0;
hctx->ccid2hctx_rpdupack = -1;
+ hctx->ccid2hctx_last_cong = jiffies;
+ hctx->ccid2hctx_high_ack = 0;
hctx->ccid2hctx_rtotimer.function = &ccid2_hc_tx_rto_expire;
hctx->ccid2hctx_rtotimer.data = (unsigned long)sk;
static void ccid2_hc_tx_exit(struct sock *sk)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid2_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
-
- ccid2_hc_tx_kill_rto_timer(hctx);
+ struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);
+ int i;
- kfree(hctx->ccid2hctx_seqbuf);
+ ccid2_hc_tx_kill_rto_timer(sk);
- kfree(dp->dccps_hc_tx_ccid_private);
- dp->dccps_hc_tx_ccid_private = NULL;
+ for (i = 0; i < hctx->ccid2hctx_seqbufc; i++)
+ kfree(hctx->ccid2hctx_seqbuf[i]);
+ hctx->ccid2hctx_seqbufc = 0;
}
static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
}
}
-static int ccid2_hc_rx_init(struct sock *sk)
-{
- struct dccp_sock *dp = dccp_sk(sk);
- dp->dccps_hc_rx_ccid_private = kzalloc(sizeof(struct ccid2_hc_rx_sock),
- gfp_any());
- return dp->dccps_hc_rx_ccid_private == NULL ? -ENOMEM : 0;
-}
-
-static void ccid2_hc_rx_exit(struct sock *sk)
-{
- struct dccp_sock *dp = dccp_sk(sk);
-
- kfree(dp->dccps_hc_rx_ccid_private);
- dp->dccps_hc_rx_ccid_private = NULL;
-}
-
-static struct ccid ccid2 = {
- .ccid_id = 2,
+static struct ccid_operations ccid2 = {
+ .ccid_id = DCCPC_CCID2,
.ccid_name = "ccid2",
.ccid_owner = THIS_MODULE,
+ .ccid_hc_tx_obj_size = sizeof(struct ccid2_hc_tx_sock),
.ccid_hc_tx_init = ccid2_hc_tx_init,
.ccid_hc_tx_exit = ccid2_hc_tx_exit,
.ccid_hc_tx_send_packet = ccid2_hc_tx_send_packet,
.ccid_hc_tx_packet_sent = ccid2_hc_tx_packet_sent,
.ccid_hc_tx_packet_recv = ccid2_hc_tx_packet_recv,
- .ccid_hc_rx_init = ccid2_hc_rx_init,
- .ccid_hc_rx_exit = ccid2_hc_rx_exit,
+ .ccid_hc_rx_obj_size = sizeof(struct ccid2_hc_rx_sock),
.ccid_hc_rx_packet_recv = ccid2_hc_rx_packet_recv,
};
+#ifdef CONFIG_IP_DCCP_CCID2_DEBUG
module_param(ccid2_debug, int, 0444);
MODULE_PARM_DESC(ccid2_debug, "Enable debug messages");
+#endif
static __init int ccid2_module_init(void)
{
module_exit(ccid2_module_exit);
MODULE_AUTHOR("Andrea Bittau <a.bittau@cs.ucl.ac.uk>");
-MODULE_DESCRIPTION("DCCP TCP CCID2 CCID");
+MODULE_DESCRIPTION("DCCP TCP-Like (CCID2) CCID");
MODULE_LICENSE("GPL");
MODULE_ALIAS("net-dccp-ccid-2");
projects / linux-drm-fsl-dcu.git / blobdiff