Merge branch 'mptcp-misc-features-for-v6-20-7-0'

Matthieu Baerts says:

====================
mptcp: misc. features for v6.20/7.0

This series contains a few independent new features, and small fixes for
net-next:

 - Patches 1-2: two small fixes linked to the MPTCP receive buffer that
   are not urgent, requiring code that has been recently changed, and is
   needed for the next patch. Because we are at the end of the cycle, it
   seems easier to send them to net-next, instead of dealing with
   conflicts between net and net-next.

 - Patch 3: a refactoring to simplify the code around MPTCP DRS.

 - Patch 4: a new trace event for MPTCP to help debugging receive buffer
   auto-tuning issues.

 - Patch 5: align internal MPTCP PM structure with NL specs, just to
   manipulate the same thing.

 - Patch 6: convert some min_t(int, ...) to min(): cleaner, and to avoid
   future warnings.

 - Patch 7: [removed]

 - Patch 8: sort all #include in MPTCP Diag tool in the selftests to
   prevent future potential conflicts and ease the reading.

 - Patches 9-11: improve the MPTCP Join selftest by waiting for an event
   instead of a "random" sleep.

 - Patches 12-14: some small cleanups in the selftests, seen while
   working on the previous patches.

 - Patch 15: avoid marking subtests as skipped while still validating
   most checks when executing the last MPTCP selftests on older kernels.
====================

Link: https://patch.msgid.link/20260203-net-next-mptcp-misc-feat-6-20-v1-0-31ec8bfc56d1@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 80 insertions, 0 deletions

diff --git a/include/trace/events/mptcp.h b/include/trace/events/mptcp.h
index 085b749cdd97..269d949b2025 100644
--- a/include/trace/events/mptcp.h
+++ b/include/trace/events/mptcp.h
@@ -5,7 +5,13 @@
 #if !defined(_TRACE_MPTCP_H) || defined(TRACE_HEADER_MULTI_READ)
 #define _TRACE_MPTCP_H
 
+#include <linux/ipv6.h>
+#include <linux/tcp.h>
 #include <linux/tracepoint.h>
+#include <net/ipv6.h>
+#include <net/tcp.h>
+#include <linux/sock_diag.h>
+#include <net/rstreason.h>
 
 #define show_mapping_status(status)					\
 	__print_symbolic(status,					\
@@ -178,6 +184,80 @@ TRACE_EVENT(subflow_check_data_avail,
 		  __entry->skb)
 );
 
+#include <trace/events/net_probe_common.h>
+
+TRACE_EVENT(mptcp_rcvbuf_grow,
+
+	TP_PROTO(struct sock *sk, int time),
+
+	TP_ARGS(sk, time),
+
+	TP_STRUCT__entry(
+		__field(int, time)
+		__field(__u32, rtt_us)
+		__field(__u32, copied)
+		__field(__u32, inq)
+		__field(__u32, space)
+		__field(__u32, ooo_space)
+		__field(__u32, rcvbuf)
+		__field(__u32, rcv_wnd)
+		__field(__u8, scaling_ratio)
+		__field(__u16, sport)
+		__field(__u16, dport)
+		__field(__u16, family)
+		__array(__u8, saddr, 4)
+		__array(__u8, daddr, 4)
+		__array(__u8, saddr_v6, 16)
+		__array(__u8, daddr_v6, 16)
+		__field(const void *, skaddr)
+	),
+
+	TP_fast_assign(
+		struct mptcp_sock *msk = mptcp_sk(sk);
+		struct inet_sock *inet = inet_sk(sk);
+		bool ofo_empty;
+		__be32 *p32;
+
+		__entry->time = time;
+		__entry->rtt_us = msk->rcvq_space.rtt_us >> 3;
+		__entry->copied = msk->rcvq_space.copied;
+		__entry->inq = mptcp_inq_hint(sk);
+		__entry->space = msk->rcvq_space.space;
+		ofo_empty = RB_EMPTY_ROOT(&msk->out_of_order_queue);
+		__entry->ooo_space = ofo_empty ? 0 :
+				     MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq -
+				     msk->ack_seq;
+
+		__entry->rcvbuf = sk->sk_rcvbuf;
+		__entry->rcv_wnd = atomic64_read(&msk->rcv_wnd_sent) -
+				   msk->ack_seq;
+		__entry->scaling_ratio = msk->scaling_ratio;
+		__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;
+
+		p32 = (__be32 *)__entry->daddr;
+		*p32 = inet->inet_daddr;
+
+		TP_STORE_ADDRS(__entry, inet->inet_saddr, inet->inet_daddr,
+			       sk->sk_v6_rcv_saddr, sk->sk_v6_daddr);
+
+		__entry->skaddr = sk;
+	),
+
+	TP_printk("time=%u rtt_us=%u copied=%u inq=%u space=%u ooo=%u scaling_ratio=%u "
+		  "rcvbuf=%u rcv_wnd=%u family=%d sport=%hu dport=%hu saddr=%pI4 "
+		  "daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c skaddr=%p",
+		  __entry->time, __entry->rtt_us, __entry->copied,
+		  __entry->inq, __entry->space, __entry->ooo_space,
+		  __entry->scaling_ratio, __entry->rcvbuf, __entry->rcv_wnd,
+		  __entry->family, __entry->sport, __entry->dport,
+		  __entry->saddr, __entry->daddr, __entry->saddr_v6,
+		  __entry->daddr_v6, __entry->skaddr)
+);
 #endif /* _TRACE_MPTCP_H */
 
 /* This part must be outside protection */