selftests/bpf: Retire bpf_tcp_helpers.h

The previous patches have consolidated the tests to use
bpf_tracing_net.h (i.e. vmlinux.h) instead of bpf_tcp_helpers.h.

This patch can finally retire the bpf_tcp_helpers.h from
the repository.
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240509175026.3423614-11-martin.lau@linux.devSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/bpf_tcp_helpers.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __BPF_TCP_HELPERS_H
-#define __BPF_TCP_HELPERS_H
-
-#include <stdbool.h>
-#include <linux/types.h>
-#include <bpf/bpf_helpers.h>
-#include <bpf/bpf_core_read.h>
-#include <bpf/bpf_tracing.h>
-
-#define BPF_STRUCT_OPS(name, args...) \
-SEC("struct_ops/"#name) \
-BPF_PROG(name, args)
-
-#ifndef SOL_TCP
-#define SOL_TCP 6
-#endif
-
-#ifndef TCP_CA_NAME_MAX
-#define TCP_CA_NAME_MAX	16
-#endif
-
-#define tcp_jiffies32 ((__u32)bpf_jiffies64())
-
-struct sock_common {
-	unsigned char	skc_state;
-	__u16		skc_num;
-} __attribute__((preserve_access_index));
-
-enum sk_pacing {
-	SK_PACING_NONE		= 0,
-	SK_PACING_NEEDED	= 1,
-	SK_PACING_FQ		= 2,
-};
-
-struct sock {
-	struct sock_common	__sk_common;
-#define sk_state		__sk_common.skc_state
-	unsigned long		sk_pacing_rate;
-	__u32			sk_pacing_status; /* see enum sk_pacing */
-} __attribute__((preserve_access_index));
-
-struct inet_sock {
-	struct sock		sk;
-} __attribute__((preserve_access_index));
-
-struct inet_connection_sock {
-	struct inet_sock	  icsk_inet;
-	__u8			  icsk_ca_state:6,
-				  icsk_ca_setsockopt:1,
-				  icsk_ca_dst_locked:1;
-	struct {
-		__u8		  pending;
-	} icsk_ack;
-	__u64			  icsk_ca_priv[104 / sizeof(__u64)];
-} __attribute__((preserve_access_index));
-
-struct request_sock {
-	struct sock_common		__req_common;
-} __attribute__((preserve_access_index));
-
-struct tcp_sock {
-	struct inet_connection_sock	inet_conn;
-
-	__u32	rcv_nxt;
-	__u32	snd_nxt;
-	__u32	snd_una;
-	__u32	window_clamp;
-	__u8	ecn_flags;
-	__u32	delivered;
-	__u32	delivered_ce;
-	__u32	snd_cwnd;
-	__u32	snd_cwnd_cnt;
-	__u32	snd_cwnd_clamp;
-	__u32	snd_ssthresh;
-	__u8	syn_data:1,	/* SYN includes data */
-		syn_fastopen:1,	/* SYN includes Fast Open option */
-		syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */
-		syn_fastopen_ch:1, /* Active TFO re-enabling probe */
-		syn_data_acked:1,/* data in SYN is acked by SYN-ACK */
-		save_syn:1,	/* Save headers of SYN packet */
-		is_cwnd_limited:1,/* forward progress limited by snd_cwnd? */
-		syn_smc:1;	/* SYN includes SMC */
-	__u32	max_packets_out;
-	__u32	lsndtime;
-	__u32	prior_cwnd;
-	__u64	tcp_mstamp;	/* most recent packet received/sent */
-	bool	is_mptcp;
-} __attribute__((preserve_access_index));
-
-static __always_inline struct inet_connection_sock *inet_csk(const struct sock *sk)
-{
-	return (struct inet_connection_sock *)sk;
-}
-
-static __always_inline void *inet_csk_ca(const struct sock *sk)
-{
-	return (void *)inet_csk(sk)->icsk_ca_priv;
-}
-
-static __always_inline struct tcp_sock *tcp_sk(const struct sock *sk)
-{
-	return (struct tcp_sock *)sk;
-}
-
-static __always_inline bool before(__u32 seq1, __u32 seq2)
-{
-	return (__s32)(seq1-seq2) < 0;
-}
-#define after(seq2, seq1) 	before(seq1, seq2)
-
-#define	TCP_ECN_OK		1
-#define	TCP_ECN_QUEUE_CWR	2
-#define	TCP_ECN_DEMAND_CWR	4
-#define	TCP_ECN_SEEN		8
-
-enum inet_csk_ack_state_t {
-	ICSK_ACK_SCHED	= 1,
-	ICSK_ACK_TIMER  = 2,
-	ICSK_ACK_PUSHED = 4,
-	ICSK_ACK_PUSHED2 = 8,
-	ICSK_ACK_NOW = 16	/* Send the next ACK immediately (once) */
-};
-
-enum tcp_ca_event {
-	CA_EVENT_TX_START = 0,
-	CA_EVENT_CWND_RESTART = 1,
-	CA_EVENT_COMPLETE_CWR = 2,
-	CA_EVENT_LOSS = 3,
-	CA_EVENT_ECN_NO_CE = 4,
-	CA_EVENT_ECN_IS_CE = 5,
-};
-
-struct ack_sample {
-	__u32 pkts_acked;
-	__s32 rtt_us;
-	__u32 in_flight;
-} __attribute__((preserve_access_index));
-
-struct rate_sample {
-	__u64  prior_mstamp; /* starting timestamp for interval */
-	__u32  prior_delivered;	/* tp->delivered at "prior_mstamp" */
-	__s32  delivered;		/* number of packets delivered over interval */
-	long interval_us;	/* time for tp->delivered to incr "delivered" */
-	__u32 snd_interval_us;	/* snd interval for delivered packets */
-	__u32 rcv_interval_us;	/* rcv interval for delivered packets */
-	long rtt_us;		/* RTT of last (S)ACKed packet (or -1) */
-	int  losses;		/* number of packets marked lost upon ACK */
-	__u32  acked_sacked;	/* number of packets newly (S)ACKed upon ACK */
-	__u32  prior_in_flight;	/* in flight before this ACK */
-	bool is_app_limited;	/* is sample from packet with bubble in pipe? */
-	bool is_retrans;	/* is sample from retransmission? */
-	bool is_ack_delayed;	/* is this (likely) a delayed ACK? */
-} __attribute__((preserve_access_index));
-
-#define TCP_CA_NAME_MAX		16
-#define TCP_CONG_NEEDS_ECN	0x2
-
-struct tcp_congestion_ops {
-	char name[TCP_CA_NAME_MAX];
-	__u32 flags;
-
-	/* initialize private data (optional) */
-	void (*init)(struct sock *sk);
-	/* cleanup private data  (optional) */
-	void (*release)(struct sock *sk);
-
-	/* return slow start threshold (required) */
-	__u32 (*ssthresh)(struct sock *sk);
-	/* do new cwnd calculation (required) */
-	void (*cong_avoid)(struct sock *sk, __u32 ack, __u32 acked);
-	/* call before changing ca_state (optional) */
-	void (*set_state)(struct sock *sk, __u8 new_state);
-	/* call when cwnd event occurs (optional) */
-	void (*cwnd_event)(struct sock *sk, enum tcp_ca_event ev);
-	/* call when ack arrives (optional) */
-	void (*in_ack_event)(struct sock *sk, __u32 flags);
-	/* new value of cwnd after loss (required) */
-	__u32  (*undo_cwnd)(struct sock *sk);
-	/* hook for packet ack accounting (optional) */
-	void (*pkts_acked)(struct sock *sk, const struct ack_sample *sample);
-	/* override sysctl_tcp_min_tso_segs */
-	__u32 (*min_tso_segs)(struct sock *sk);
-	/* returns the multiplier used in tcp_sndbuf_expand (optional) */
-	__u32 (*sndbuf_expand)(struct sock *sk);
-	/* call when packets are delivered to update cwnd and pacing rate,
-	 * after all the ca_state processing. (optional)
-	 */
-	void (*cong_control)(struct sock *sk, const struct rate_sample *rs);
-	void *owner;
-};
-
-#define min(a, b) ((a) < (b) ? (a) : (b))
-#define max(a, b) ((a) > (b) ? (a) : (b))
-#define min_not_zero(x, y) ({			\
-	typeof(x) __x = (x);			\
-	typeof(y) __y = (y);			\
-	__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
-
-static __always_inline bool tcp_in_slow_start(const struct tcp_sock *tp)
-{
-	return tp->snd_cwnd < tp->snd_ssthresh;
-}
-
-static __always_inline bool tcp_is_cwnd_limited(const struct sock *sk)
-{
-	const struct tcp_sock *tp = tcp_sk(sk);
-
-	/* If in slow start, ensure cwnd grows to twice what was ACKed. */
-	if (tcp_in_slow_start(tp))
-		return tp->snd_cwnd < 2 * tp->max_packets_out;
-
-	return !!BPF_CORE_READ_BITFIELD(tp, is_cwnd_limited);
-}
-
-static __always_inline bool tcp_cc_eq(const char *a, const char *b)
-{
-	int i;
-
-	for (i = 0; i < TCP_CA_NAME_MAX; i++) {
-		if (a[i] != b[i])
-			return false;
-		if (!a[i])
-			break;
-	}
-
-	return true;
-}
-
-extern __u32 tcp_slow_start(struct tcp_sock *tp, __u32 acked) __ksym;
-extern void tcp_cong_avoid_ai(struct tcp_sock *tp, __u32 w, __u32 acked) __ksym;
-
-struct mptcp_sock {
-	struct inet_connection_sock	sk;
-
-	__u32		token;
-	struct sock	*first;
-	char		ca_name[TCP_CA_NAME_MAX];
-} __attribute__((preserve_access_index));
-
-#endif