tcp: introduce tcp_clock_ms()

It delivers current TCP time stamp in ms unit, and is used
in place of confusing tcp_time_stamp_raw()

It is the same family than tcp_clock_ns() and tcp_clock_ms().

tcp_time_stamp_raw() will be replaced later for TSval
contexts with a more descriptive name.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -798,6 +798,11 @@ static inline u64 tcp_clock_us(void)
 	return div_u64(tcp_clock_ns(), NSEC_PER_USEC);
 }
 
+static inline u64 tcp_clock_ms(void)
+{
+	return div_u64(tcp_clock_ns(), NSEC_PER_MSEC);
+}
+
 /* This should only be used in contexts where tp->tcp_mstamp is up to date */
 static inline u32 tcp_time_stamp(const struct tcp_sock *tp)
 {

net/ipv4/tcp.c

@@ -3817,10 +3817,8 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
 	info->tcpi_total_rto = tp->total_rto;
 	info->tcpi_total_rto_recoveries = tp->total_rto_recoveries;
 	info->tcpi_total_rto_time = tp->total_rto_time;
-	if (tp->rto_stamp) {
-		info->tcpi_total_rto_time += tcp_time_stamp_raw() -
-						tp->rto_stamp;
-	}
+	if (tp->rto_stamp)
+		info->tcpi_total_rto_time += tcp_clock_ms() - tp->rto_stamp;
 
 	unlock_sock_fast(sk, slow);
 }

net/ipv4/tcp_minisocks.c

@@ -567,7 +567,7 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
 					       USEC_PER_SEC / TCP_TS_HZ);
 		newtp->total_rto = req->num_timeout;
 		newtp->total_rto_recoveries = 1;
-		newtp->total_rto_time = tcp_time_stamp_raw() -
+		newtp->total_rto_time = tcp_clock_ms() -
 					newtp->retrans_stamp;
 	}
 	newtp->tsoffset = treq->ts_off;

net/netfilter/nf_synproxy_core.c

@@ -153,7 +153,7 @@ void synproxy_init_timestamp_cookie(const struct nf_synproxy_info *info,
 				    struct synproxy_options *opts)
 {
 	opts->tsecr = opts->tsval;
-	opts->tsval = tcp_time_stamp_raw() & ~0x3f;
+	opts->tsval = tcp_clock_ms() & ~0x3f;
 
 	if (opts->options & NF_SYNPROXY_OPT_WSCALE) {
 		opts->tsval |= opts->wscale;

tools/testing/selftests/bpf/progs/xdp_synproxy_kern.c

@@ -177,7 +177,7 @@ static __always_inline __u32 tcp_ns_to_ts(__u64 ns)
 	return ns / (NSEC_PER_SEC / TCP_TS_HZ);
 }
 
-static __always_inline __u32 tcp_time_stamp_raw(void)
+static __always_inline __u32 tcp_clock_ms(void)
 {
 	return tcp_ns_to_ts(tcp_clock_ns());
 }
@@ -274,7 +274,7 @@ static __always_inline bool tscookie_init(struct tcphdr *tcp_header,
 	if (!loop_ctx.option_timestamp)
 		return false;
 
-	cookie = tcp_time_stamp_raw() & ~TSMASK;
+	cookie = tcp_clock_ms() & ~TSMASK;
 	cookie |= loop_ctx.wscale & TS_OPT_WSCALE_MASK;
 	if (loop_ctx.option_sack)
 		cookie |= TS_OPT_SACK;