[DCCP] Introduce dccp_timestamp
Arnaldo Carvalho de Melo [Fri, 9 Sep 2005 05:38:35 +0000 (02:38 -0300)]
To start the timestamps with 0.0ms, easing the integer maths in the CCIDs, this
probably will be reworked to use the to be introduced struct timeval_offset
infrastructure out of skb_get_timestamp, etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

include/linux/dccp.h
net/dccp/ccids/ccid3.c
net/dccp/ccids/ccid3.h
net/dccp/ccids/lib/packet_history.h
net/dccp/dccp.h
net/dccp/input.c
net/dccp/ipv4.c
net/dccp/minisocks.c
net/dccp/options.c

index 5e0af0d..8bf4bac 100644 (file)
@@ -432,6 +432,7 @@ struct dccp_sock {
        struct ccid                     *dccps_hc_rx_ccid;
        struct ccid                     *dccps_hc_tx_ccid;
        struct dccp_options_received    dccps_options_received;
+       struct timeval                  dccps_epoch;
        enum dccp_role                  dccps_role:2;
        __u8                            dccps_hc_rx_insert_options:1;
        __u8                            dccps_hc_tx_insert_options:1;
index 145aafa..348e6fb 100644 (file)
@@ -169,7 +169,7 @@ static void ccid3_hc_tx_update_x(struct sock *sk)
        } else {
                struct timeval now;
 
-               do_gettimeofday(&now);
+               dccp_timestamp(sk, &now);
                if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
                    hctx->ccid3hctx_rtt) {
                        hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
@@ -317,7 +317,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
                dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
        }
 
-       do_gettimeofday(&now);
+       dccp_timestamp(sk, &now);
 
        switch (hctx->ccid3hctx_state) {
        case TFRC_SSTATE_NO_SENT:
@@ -382,7 +382,7 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
                return;
        }
 
-       do_gettimeofday(&now);
+       dccp_timestamp(sk, &now);
 
        /* check if we have sent a data packet */
        if (len > 0) {
@@ -461,6 +461,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
        struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
        struct ccid3_options_received *opt_recv;
        struct dccp_tx_hist_entry *packet;
+       struct timeval now;
        unsigned long next_tmout; 
        u32 t_elapsed;
        u32 pinv;
@@ -508,7 +509,8 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
                }
 
                /* Update RTT */
-               r_sample = timeval_now_delta(&packet->dccphtx_tstamp);
+               dccp_timestamp(sk, &now);
+               r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
                if (unlikely(r_sample <= t_elapsed))
                        LIMIT_NETDEBUG(KERN_WARNING
                                       "%s: r_sample=%uus, t_elapsed=%uus\n",
@@ -774,7 +776,7 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
 
        ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
 
-       do_gettimeofday(&now);
+       dccp_timestamp(sk, &now);
 
        switch (hcrx->ccid3hcrx_state) {
        case TFRC_RSTATE_NO_DATA:
@@ -903,10 +905,9 @@ found:
        if (rtt == 0)
                rtt = 1;
 
-       delta = timeval_now_delta(&hcrx->ccid3hcrx_tstamp_last_feedback);
-       x_recv = hcrx->ccid3hcrx_bytes_recv * USEC_PER_SEC;
-       if (likely(delta > 1))
-               x_recv /= delta;
+       dccp_timestamp(sk, &tstamp);
+       delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
+       x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
 
        tmp1 = (u64)x_recv * (u64)rtt;
        do_div(tmp1,10000000);
@@ -981,7 +982,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
                if (opt_recv->dccpor_timestamp_echo == 0)
                        break;
                p_prev = hcrx->ccid3hcrx_rtt;
-               do_gettimeofday(&now);
+               dccp_timestamp(sk, &now);
                timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
                r_sample = timeval_usecs(&now);
                t_elapsed = opt_recv->dccpor_elapsed_time * 10;
@@ -1013,7 +1014,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
                return;
        }
 
-       packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp,
+       packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, opt_recv->dccpor_ndp,
                                        skb, SLAB_ATOMIC);
        if (packet == NULL) {
                ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet "
@@ -1045,7 +1046,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
                if (ins != 0)
                        break;
 
-               do_gettimeofday(&now);
+               dccp_timestamp(sk, &now);
                if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
                    hcrx->ccid3hcrx_rtt) {
                        hcrx->ccid3hcrx_tstamp_last_ack = now;
@@ -1100,7 +1101,7 @@ static int ccid3_hc_rx_init(struct sock *sk)
        hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
        INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
        INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
-       do_gettimeofday(&hcrx->ccid3hcrx_tstamp_last_ack);
+       dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
        hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
        hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
        return 0;
index ee8cbac..58be612 100644 (file)
@@ -115,7 +115,7 @@ struct ccid3_hc_rx_sock {
        u64                     ccid3hcrx_seqno_last_counter:48,
                                ccid3hcrx_state:8,
                                ccid3hcrx_last_counter:4;
-       unsigned long           ccid3hcrx_rtt;
+       u32                     ccid3hcrx_rtt;
        u32                     ccid3hcrx_p;
        u32                     ccid3hcrx_bytes_recv;
        struct timeval          ccid3hcrx_tstamp_last_feedback;
index fb90a91..b375ebd 100644 (file)
@@ -134,6 +134,7 @@ static inline struct dccp_tx_hist_entry *
 
 static inline struct dccp_rx_hist_entry *
                     dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
+                                           const struct sock *sk, 
                                            const u32 ndp, 
                                            const struct sk_buff *skb,
                                            const unsigned int __nocast prio)
@@ -148,7 +149,7 @@ static inline struct dccp_rx_hist_entry *
                entry->dccphrx_ccval = dh->dccph_ccval;
                entry->dccphrx_type  = dh->dccph_type;
                entry->dccphrx_ndp   = ndp;
-               do_gettimeofday(&(entry->dccphrx_tstamp));
+               dccp_timestamp(sk, &entry->dccphrx_tstamp);
        }
 
        return entry;
index 33456c0..95c4630 100644 (file)
@@ -426,10 +426,13 @@ extern struct dccp_ackpkts *
                dccp_ackpkts_alloc(unsigned int len,
                                  const unsigned int __nocast priority);
 extern void dccp_ackpkts_free(struct dccp_ackpkts *ap);
-extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state);
+extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
+                           u64 ackno, u8 state);
 extern void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap,
                                         struct sock *sk, u64 ackno);
 
+extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
+
 static inline suseconds_t timeval_usecs(const struct timeval *tv)
 {
        return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
@@ -468,17 +471,6 @@ static inline void timeval_sub_usecs(struct timeval *tv,
        }
 }
 
-/*
- * Returns the difference in usecs between timeval
- * passed in and current time
- */
-static inline suseconds_t timeval_now_delta(const struct timeval *tv)
-{
-       struct timeval now;
-       do_gettimeofday(&now);
-       return timeval_delta(&now, tv);
-}
-
 #ifdef CONFIG_IP_DCCP_DEBUG
 extern void dccp_ackvector_print(const u64 ackno,
                                 const unsigned char *vector, int len);
index ef29cef..c60bc34 100644 (file)
@@ -170,7 +170,7 @@ int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
        if (dp->dccps_options.dccpo_send_ack_vector) {
                struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
 
-               if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts,
+               if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts, sk,
                                     DCCP_SKB_CB(skb)->dccpd_seq,
                                     DCCP_ACKPKTS_STATE_RECEIVED)) {
                        LIMIT_NETDEBUG(KERN_WARNING "DCCP: acknowledgeable "
@@ -498,7 +498,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
                 * DCCP_ACKPKTS_STATE_ECN_MARKED
                 */
                if (dp->dccps_options.dccpo_send_ack_vector) {
-                       if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts,
+                       if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts, sk,
                                             DCCP_SKB_CB(skb)->dccpd_seq,
                                             DCCP_ACKPKTS_STATE_RECEIVED))
                                goto discard;
index 3fc75db..fee9a8c 100644 (file)
@@ -1243,6 +1243,7 @@ static int dccp_v4_init_sock(struct sock *sk)
        static int dccp_ctl_socket_init = 1;
 
        dccp_options_init(&dp->dccps_options);
+       do_gettimeofday(&dp->dccps_epoch);
 
        if (dp->dccps_options.dccpo_send_ack_vector) {
                dp->dccps_hc_rx_ackpkts =
index ce5dff4..18461bc 100644 (file)
@@ -96,6 +96,7 @@ struct sock *dccp_create_openreq_child(struct sock *sk,
                newdp->dccps_hc_rx_ackpkts = NULL;
                newdp->dccps_role = DCCP_ROLE_SERVER;
                newicsk->icsk_rto = DCCP_TIMEOUT_INIT;
+               do_gettimeofday(&newdp->dccps_epoch);
 
                if (newdp->dccps_options.dccpo_send_ack_vector) {
                        newdp->dccps_hc_rx_ackpkts =
index 34b230a..d4c4242 100644 (file)
@@ -140,7 +140,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
                        opt_recv->dccpor_timestamp = ntohl(*(u32 *)value);
 
                        dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
-                       do_gettimeofday(&dp->dccps_timestamp_time);
+                       dccp_timestamp(sk, &dp->dccps_timestamp_time);
 
                        dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n",
                                      debug_prefix, opt_recv->dccpor_timestamp,
@@ -361,9 +361,13 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
 #endif
        struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
        int len = ap->dccpap_buf_vector_len + 2;
-       const u32 elapsed_time = timeval_now_delta(&ap->dccpap_time) / 10;
+       struct timeval now;
+       u32 elapsed_time;
        unsigned char *to, *from;
 
+       dccp_timestamp(sk, &now);
+       elapsed_time = timeval_delta(&now, &ap->dccpap_time) / 10;
+
        if (elapsed_time != 0)
                dccp_insert_option_elapsed_time(sk, skb, elapsed_time);
 
@@ -428,13 +432,29 @@ static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)
                      (unsigned long long) ap->dccpap_ack_ackno);
 }
 
+void dccp_timestamp(const struct sock *sk, struct timeval *tv)
+{
+       const struct dccp_sock *dp = dccp_sk(sk);
+
+       do_gettimeofday(tv);
+       tv->tv_sec  -= dp->dccps_epoch.tv_sec;
+       tv->tv_usec -= dp->dccps_epoch.tv_usec;
+
+       while (tv->tv_usec < 0) {
+               tv->tv_sec--;
+               tv->tv_usec += USEC_PER_SEC;
+       }
+}
+
+EXPORT_SYMBOL_GPL(dccp_timestamp);
+
 void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
 {
        struct timeval tv;
        u32 now;
        
-       do_gettimeofday(&tv);
-       now = (tv.tv_sec * USEC_PER_SEC + tv.tv_usec) / 10;
+       dccp_timestamp(sk, &tv);
+       now = timeval_usecs(&tv) / 10;
        /* yes this will overflow but that is the point as we want a
         * 10 usec 32 bit timer which mean it wraps every 11.9 hours */
 
@@ -452,13 +472,17 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk,
        const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
                                        "CLIENT TX opt: " : "server TX opt: ";
 #endif
+       struct timeval now;
        u32 tstamp_echo;
-       const u32 elapsed_time =
-                       timeval_now_delta(&dp->dccps_timestamp_time) / 10;
-       const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
-       const int len = 6 + elapsed_time_len;
+       u32 elapsed_time;
+       int len, elapsed_time_len;
        unsigned char *to;
 
+       dccp_timestamp(sk, &now);
+       elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10;
+       elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
+       len = 6 + elapsed_time_len;
+
        if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
                LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
                                         "timestamp echo!\n");
@@ -623,7 +647,8 @@ static inline int dccp_ackpkts_set_buf_head_state(struct dccp_ackpkts *ap,
 /*
  * Implements the draft-ietf-dccp-spec-11.txt Appendix A
  */
-int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
+int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
+                    u64 ackno, u8 state)
 {
        /*
         * Check at the right places if the buffer is full, if it is, tell the
@@ -704,7 +729,7 @@ int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
        }
 
        ap->dccpap_buf_ackno = ackno;
-       do_gettimeofday(&ap->dccpap_time);
+       dccp_timestamp(sk, &ap->dccpap_time);
 out:
        dccp_pr_debug("");
        dccp_ackpkts_print(ap);