Merge branch 'selftests-bpf-retire-bpf_tcp_helpers-h'

Martin KaFai Lau says:

====================
selftests/bpf: Retire bpf_tcp_helpers.h

From: Martin KaFai Lau <martin.lau@kernel.org>

The earlier commit 8e6d9ae ("selftests/bpf: Use bpf_tracing.h instead of bpf_tcp_helpers.h")
removed the bpf_tcp_helpers.h usages from the non networking tests.

This patch set is a continuation of this effort to retire
the bpf_tcp_helpers.h from the networking tests (mostly tcp-cc related).

The main usage of the bpf_tcp_helpers.h is the partial kernel
socket definitions (e.g. sock, tcp_sock). New fields are kept adding
back to those partial socket definitions while everything is available
in the vmlinux.h. The recent bpf_cc_cubic.c test tried to extend
bpf_tcp_helpers.c but eventually used the vmlinux.h instead. To avoid
this unnecessary detour for new tests and have one consistent way
of using the kernel sockets, this patch set retires the bpf_tcp_helpers.h
usages and consolidates the tests to use vmlinux.h instead.
====================

Link: https://lore.kernel.org/r/20240509175026.3423614-1-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Author: Alexei Starovoitov

tools/testing/selftests/bpf/bpf_tcp_helpers.h

@@ -13,15 +13,9 @@
  *    kernel functions.
  */
 
-#include "vmlinux.h"
-
+#include "bpf_tracing_net.h"
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
-#include "bpf_tracing_net.h"
-
-#define BPF_STRUCT_OPS(name, args...) \
-SEC("struct_ops/"#name) \
-BPF_PROG(name, args)
 
 #define USEC_PER_SEC 1000000UL
 #define TCP_PACING_SS_RATIO (200)
@@ -40,16 +34,6 @@ extern __u32 tcp_reno_undo_cwnd(struct sock *sk) __ksym;
 extern void cubictcp_acked(struct sock *sk, const struct ack_sample *sample) __ksym;
 extern void cubictcp_cong_avoid(struct sock *sk, __u32 ack, __u32 acked) __ksym;
 
-static struct inet_connection_sock *inet_csk(const struct sock *sk)
-{
-	return (struct inet_connection_sock *)sk;
-}
-
-static struct tcp_sock *tcp_sk(const struct sock *sk)
-{
-	return (struct tcp_sock *)sk;
-}
-
 static bool before(__u32 seq1, __u32 seq2)
 {
 	return (__s32)(seq1-seq2) < 0;
@@ -126,18 +110,21 @@ static bool tcp_may_raise_cwnd(const struct sock *sk, const int flag)
 	return flag & FLAG_DATA_ACKED;
 }
 
-void BPF_STRUCT_OPS(bpf_cubic_init, struct sock *sk)
+SEC("struct_ops")
+void BPF_PROG(bpf_cubic_init, struct sock *sk)
 {
 	cubictcp_init(sk);
 }
 
-void BPF_STRUCT_OPS(bpf_cubic_cwnd_event, struct sock *sk, enum tcp_ca_event event)
+SEC("struct_ops")
+void BPF_PROG(bpf_cubic_cwnd_event, struct sock *sk, enum tcp_ca_event event)
 {
 	cubictcp_cwnd_event(sk, event);
 }
 
-void BPF_STRUCT_OPS(bpf_cubic_cong_control, struct sock *sk, __u32 ack, int flag,
-		    const struct rate_sample *rs)
+SEC("struct_ops")
+void BPF_PROG(bpf_cubic_cong_control, struct sock *sk, __u32 ack, int flag,
+	      const struct rate_sample *rs)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
@@ -163,23 +150,26 @@ void BPF_STRUCT_OPS(bpf_cubic_cong_control, struct sock *sk, __u32 ack, int flag
 	tcp_update_pacing_rate(sk);
 }
 
-__u32 BPF_STRUCT_OPS(bpf_cubic_recalc_ssthresh, struct sock *sk)
+SEC("struct_ops")
+__u32 BPF_PROG(bpf_cubic_recalc_ssthresh, struct sock *sk)
 {
 	return cubictcp_recalc_ssthresh(sk);
 }
 
-void BPF_STRUCT_OPS(bpf_cubic_state, struct sock *sk, __u8 new_state)
+SEC("struct_ops")
+void BPF_PROG(bpf_cubic_state, struct sock *sk, __u8 new_state)
 {
 	cubictcp_state(sk, new_state);
 }
 
-void BPF_STRUCT_OPS(bpf_cubic_acked, struct sock *sk,
-		const struct ack_sample *sample)
+SEC("struct_ops")
+void BPF_PROG(bpf_cubic_acked, struct sock *sk, const struct ack_sample *sample)
 {
 	cubictcp_acked(sk, sample);
 }
 
-__u32 BPF_STRUCT_OPS(bpf_cubic_undo_cwnd, struct sock *sk)
+SEC("struct_ops")
+__u32 BPF_PROG(bpf_cubic_undo_cwnd, struct sock *sk)
 {
 	return tcp_reno_undo_cwnd(sk);
 }