scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 191 insertions, 0 deletions

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
new file mode 100644
index 000000000..2cc5d416b
--- /dev/null
+++ b/include/net/inet6_hashtables.h
@@ -0,0 +1,191 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ * Authors:	Lotsa people, from code originally in tcp
+ */
+
+#ifndef _INET6_HASHTABLES_H
+#define _INET6_HASHTABLES_H
+
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/types.h>
+#include <linux/jhash.h>
+
+#include <net/inet_sock.h>
+
+#include <net/ipv6.h>
+#include <net/netns/hash.h>
+
+struct inet_hashinfo;
+
+void inet6_init_ehash_secret(void);
+
+static inline unsigned int __inet6_ehashfn(const u32 lhash,
+				    const u16 lport,
+				    const u32 fhash,
+				    const __be16 fport,
+				    const u32 initval)
+{
+	const u32 ports = (((u32)lport) << 16) | (__force u32)fport;
+	return jhash_3words(lhash, fhash, ports, initval);
+}
+
+/*
+ * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
+ * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
+ *
+ * The sockhash lock must be held as a reader here.
+ */
+struct sock *__inet6_lookup_established(const struct net *net,
+					const struct in6_addr *saddr,
+					const __be16 sport,
+					const struct in6_addr *daddr,
+					const u16 hnum, const int dif,
+					const int sdif);
+
+typedef u32 (inet6_ehashfn_t)(const struct net *net,
+			       const struct in6_addr *laddr, const u16 lport,
+			       const struct in6_addr *faddr, const __be16 fport);
+
+inet6_ehashfn_t inet6_ehashfn;
+
+INDIRECT_CALLABLE_DECLARE(inet6_ehashfn_t udp6_ehashfn);
+
+struct sock *inet6_lookup_reuseport(const struct net *net, struct sock *sk,
+				    struct sk_buff *skb, int doff,
+				    const struct in6_addr *saddr,
+				    __be16 sport,
+				    const struct in6_addr *daddr,
+				    unsigned short hnum,
+				    inet6_ehashfn_t *ehashfn);
+
+struct sock *inet6_lookup_listener(const struct net *net,
+				   struct sk_buff *skb, int doff,
+				   const struct in6_addr *saddr,
+				   const __be16 sport,
+				   const struct in6_addr *daddr,
+				   const unsigned short hnum,
+				   const int dif, const int sdif);
+
+struct sock *inet6_lookup_run_sk_lookup(const struct net *net,
+					int protocol,
+					struct sk_buff *skb, int doff,
+					const struct in6_addr *saddr,
+					const __be16 sport,
+					const struct in6_addr *daddr,
+					const u16 hnum, const int dif,
+					inet6_ehashfn_t *ehashfn);
+
+static inline struct sock *__inet6_lookup(const struct net *net,
+					  struct sk_buff *skb, int doff,
+					  const struct in6_addr *saddr,
+					  const __be16 sport,
+					  const struct in6_addr *daddr,
+					  const u16 hnum,
+					  const int dif, const int sdif,
+					  bool *refcounted)
+{
+	struct sock *sk = __inet6_lookup_established(net, saddr, sport,
+						     daddr, hnum,
+						     dif, sdif);
+	*refcounted = true;
+	if (sk)
+		return sk;
+	*refcounted = false;
+	return inet6_lookup_listener(net, skb, doff, saddr, sport,
+				     daddr, hnum, dif, sdif);
+}
+
+static inline
+struct sock *inet6_steal_sock(struct net *net, struct sk_buff *skb, int doff,
+			      const struct in6_addr *saddr, const __be16 sport,
+			      const struct in6_addr *daddr, const __be16 dport,
+			      bool *refcounted, inet6_ehashfn_t *ehashfn)
+{
+	struct sock *sk, *reuse_sk;
+	bool prefetched;
+
+	sk = skb_steal_sock(skb, refcounted, &prefetched);
+	if (!sk)
+		return NULL;
+
+	if (!prefetched || !sk_fullsock(sk))
+		return sk;
+
+	if (sk->sk_protocol == IPPROTO_TCP) {
+		if (sk->sk_state != TCP_LISTEN)
+			return sk;
+	} else if (sk->sk_protocol == IPPROTO_UDP) {
+		if (sk->sk_state != TCP_CLOSE)
+			return sk;
+	} else {
+		return sk;
+	}
+
+	reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
+					  saddr, sport, daddr, ntohs(dport),
+					  ehashfn);
+	if (!reuse_sk)
+		return sk;
+
+	/* We've chosen a new reuseport sock which is never refcounted. This
+	 * implies that sk also isn't refcounted.
+	 */
+	WARN_ON_ONCE(*refcounted);
+
+	return reuse_sk;
+}
+
+static inline struct sock *__inet6_lookup_skb(struct sk_buff *skb, int doff,
+					      const __be16 sport,
+					      const __be16 dport,
+					      int iif, int sdif,
+					      bool *refcounted)
+{
+	struct net *net = skb_dst_dev_net_rcu(skb);
+	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+	struct sock *sk;
+
+	sk = inet6_steal_sock(net, skb, doff, &ip6h->saddr, sport, &ip6h->daddr, dport,
+			      refcounted, inet6_ehashfn);
+	if (IS_ERR(sk))
+		return NULL;
+	if (sk)
+		return sk;
+
+	return __inet6_lookup(net, skb, doff, &ip6h->saddr, sport,
+			      &ip6h->daddr, ntohs(dport),
+			      iif, sdif, refcounted);
+}
+
+struct sock *inet6_lookup(const struct net *net, struct sk_buff *skb, int doff,
+			  const struct in6_addr *saddr, const __be16 sport,
+			  const struct in6_addr *daddr, const __be16 dport,
+			  const int dif);
+
+static inline bool inet6_match(const struct net *net, const struct sock *sk,
+			       const struct in6_addr *saddr,
+			       const struct in6_addr *daddr,
+			       const __portpair ports,
+			       const int dif, const int sdif)
+{
+	if (!net_eq(sock_net(sk), net) ||
+	    sk->sk_family != AF_INET6 ||
+	    READ_ONCE(sk->sk_portpair) != ports ||
+	    !ipv6_addr_equal(&sk->sk_v6_daddr, saddr) ||
+	    !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
+		return false;
+
+	/* READ_ONCE() paired with WRITE_ONCE() in sock_bindtoindex_locked() */
+	return inet_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif,
+				    sdif);
+}
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+
+#endif /* _INET6_HASHTABLES_H */