net: tracepoint: exposing sk_family in all tcp:tracepoints

Similar to sock:inet_sock_set_state tracepoint, expose sk_family to
distinguish AF_INET and AF_INET6 families.

The following tcp tracepoints are updated:
tcp:tcp_destroy_sock
tcp:tcp_rcv_space_adjust
tcp:tcp_retransmit_skb
tcp:tcp_send_reset
tcp:tcp_receive_reset
tcp:tcp_retransmit_synack
tcp:tcp_probe
Signed-off-by: Hariharan Ananthakrishnan <hari@netflix.com>
Signed-off-by: Brendan Gregg <bgregg@netflix.com>
Link: https://lore.kernel.org/r/20210129001210.344438-1-hari@netflix.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/trace/events/tcp.h

@@ -59,6 +59,7 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb,
 		__field(int, state)
 		__field(__u16, sport)
 		__field(__u16, dport)
+		__field(__u16, family)
 		__array(__u8, saddr, 4)
 		__array(__u8, daddr, 4)
 		__array(__u8, saddr_v6, 16)
@@ -75,6 +76,7 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb,
 
 		__entry->sport = ntohs(inet->inet_sport);
 		__entry->dport = ntohs(inet->inet_dport);
+		__entry->family = sk->sk_family;
 
 		p32 = (__be32 *) __entry->saddr;
 		*p32 = inet->inet_saddr;
@@ -86,7 +88,8 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb,
 			      sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
 	),
 
-	TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c state=%s",
+	TP_printk("family=%s sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c state=%s",
+		  show_family_name(__entry->family),
 		  __entry->sport, __entry->dport, __entry->saddr, __entry->daddr,
 		  __entry->saddr_v6, __entry->daddr_v6,
 		  show_tcp_state_name(__entry->state))
@@ -125,6 +128,7 @@ DECLARE_EVENT_CLASS(tcp_event_sk,
 		__field(const void *, skaddr)
 		__field(__u16, sport)
 		__field(__u16, dport)
+		__field(__u16, family)
 		__array(__u8, saddr, 4)
 		__array(__u8, daddr, 4)
 		__array(__u8, saddr_v6, 16)
@@ -140,6 +144,7 @@ DECLARE_EVENT_CLASS(tcp_event_sk,
 
 		__entry->sport = ntohs(inet->inet_sport);
 		__entry->dport = ntohs(inet->inet_dport);
+		__entry->family = sk->sk_family;
 
 		p32 = (__be32 *) __entry->saddr;
 		*p32 = inet->inet_saddr;
@@ -153,7 +158,8 @@ DECLARE_EVENT_CLASS(tcp_event_sk,
 		__entry->sock_cookie = sock_gen_cookie(sk);
 	),
 
-	TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c sock_cookie=%llx",
+	TP_printk("family=%s sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c sock_cookie=%llx",
+		  show_family_name(__entry->family),
 		  __entry->sport, __entry->dport,
 		  __entry->saddr, __entry->daddr,
 		  __entry->saddr_v6, __entry->daddr_v6,
@@ -192,6 +198,7 @@ TRACE_EVENT(tcp_retransmit_synack,
 		__field(const void *, req)
 		__field(__u16, sport)
 		__field(__u16, dport)
+		__field(__u16, family)
 		__array(__u8, saddr, 4)
 		__array(__u8, daddr, 4)
 		__array(__u8, saddr_v6, 16)
@@ -207,6 +214,7 @@ TRACE_EVENT(tcp_retransmit_synack,
 
 		__entry->sport = ireq->ir_num;
 		__entry->dport = ntohs(ireq->ir_rmt_port);
+		__entry->family = sk->sk_family;
 
 		p32 = (__be32 *) __entry->saddr;
 		*p32 = ireq->ir_loc_addr;
@@ -218,7 +226,8 @@ TRACE_EVENT(tcp_retransmit_synack,
 			      ireq->ir_v6_loc_addr, ireq->ir_v6_rmt_addr);
 	),
 
-	TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
+	TP_printk("family=%s sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c",
+		  show_family_name(__entry->family),
 		  __entry->sport, __entry->dport,
 		  __entry->saddr, __entry->daddr,
 		  __entry->saddr_v6, __entry->daddr_v6)
@@ -238,6 +247,7 @@ TRACE_EVENT(tcp_probe,
 		__array(__u8, daddr, sizeof(struct sockaddr_in6))
 		__field(__u16, sport)
 		__field(__u16, dport)
+		__field(__u16, family)
 		__field(__u32, mark)
 		__field(__u16, data_len)
 		__field(__u32, snd_nxt)
@@ -264,6 +274,7 @@ TRACE_EVENT(tcp_probe,
 		__entry->sport = ntohs(inet->inet_sport);
 		__entry->dport = ntohs(inet->inet_dport);
 		__entry->mark = skb->mark;
+		__entry->family = sk->sk_family;
 
 		__entry->data_len = skb->len - __tcp_hdrlen(th);
 		__entry->snd_nxt = tp->snd_nxt;
@@ -276,7 +287,8 @@ TRACE_EVENT(tcp_probe,
 		__entry->sock_cookie = sock_gen_cookie(sk);
 	),
 
-	TP_printk("src=%pISpc dest=%pISpc mark=%#x data_len=%d snd_nxt=%#x snd_una=%#x snd_cwnd=%u ssthresh=%u snd_wnd=%u srtt=%u rcv_wnd=%u sock_cookie=%llx",
+	TP_printk("family=%s src=%pISpc dest=%pISpc mark=%#x data_len=%d snd_nxt=%#x snd_una=%#x snd_cwnd=%u ssthresh=%u snd_wnd=%u srtt=%u rcv_wnd=%u sock_cookie=%llx",
+		  show_family_name(__entry->family),
 		  __entry->saddr, __entry->daddr, __entry->mark,
 		  __entry->data_len, __entry->snd_nxt, __entry->snd_una,
 		  __entry->snd_cwnd, __entry->ssthresh, __entry->snd_wnd,