Merge branch 'bpf: Support calling kernel function'

Martin KaFai says:

====================

This series adds support to allow bpf program calling kernel function.

The use case included in this set is to allow bpf-tcp-cc to directly
call some tcp-cc helper functions (e.g. "tcp_cong_avoid_ai()").  Those
functions have already been used by some kernel tcp-cc implementations.

This set will also allow the bpf-tcp-cc program to directly call the
kernel tcp-cc implementation,  For example, a bpf_dctcp may only want to
implement its own dctcp_cwnd_event() and reuse other dctcp_*() directly
from the kernel tcp_dctcp.c instead of reimplementing (or
copy-and-pasting) them.

The tcp-cc kernel functions mentioned above will be white listed
for the struct_ops bpf-tcp-cc programs to use in a later patch.
The white listed functions are not bounded to a fixed ABI contract.
Those functions have already been used by the existing kernel tcp-cc.
If any of them has changed, both in-tree and out-of-tree kernel tcp-cc
implementations have to be changed.  The same goes for the struct_ops
bpf-tcp-cc programs which have to be adjusted accordingly.

Please see individual patch for details.

v2:
- Patch 2 in v1 is removed.  No need to support extern func in kernel.
  Changed libbpf to adjust the .ksyms datasec for extern func
  in patch 11. (Andrii)
- Name change: btf_check_func_arg_match() and btf_check_subprog_arg_match()
  in patch 2. (Andrii)
- Always set unreliable on any error in patch 2 since it does not
  matter. (Andrii)
- s/kern_func/kfunc/ and s/descriptor/desc/ in this set. (Andrii)
- Remove some unnecessary changes in disasm.h and disasm.c
  in patch 3.  In particular, no need to change the function
  signature in bpf_insn_revmap_call_t.  Also, removed the changes
  in print_bpf_insn().
- Fixed an issue in check_kfunc_call() when the calling kernel function
  returns a pointer in patch 3.  Added a selftest.
- Adjusted the verifier selftests due to the changes in the verifier log
  in patch 3.
- Fixed a comparison issue in kfunc_desc_cmp_by_imm() in patch 3. (Andrii)
- Name change: is_ldimm64_insn(),
  new helper: is_call_insn() in patch 10 (Andrii)
- Move btf_func_linkage() from btf.h to libbpf.c in patch 11. (Andrii)
- Fixed the linker error when CONFIG_BPF_SYSCALL is not defined.
  Moved the check_kfunc_call from filter.c to test_run.c in patch 14.
  (kernel test robot)
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 12 insertions, 12 deletions

diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index ffcbe46dacdb..4a30deaa9a37 100644
--- a/net/ipv4/tcp_cubic.c
+++ b/net/ipv4/tcp_cubic.c
@@ -124,7 +124,7 @@ static inline void bictcp_hystart_reset(struct sock *sk)
 	ca->sample_cnt = 0;
 }
 
-static void bictcp_init(struct sock *sk)
+static void cubictcp_init(struct sock *sk)
 {
 	struct bictcp *ca = inet_csk_ca(sk);
 
@@ -137,7 +137,7 @@ static void bictcp_init(struct sock *sk)
 		tcp_sk(sk)->snd_ssthresh = initial_ssthresh;
 }
 
-static void bictcp_cwnd_event(struct sock *sk, enum tcp_ca_event event)
+static void cubictcp_cwnd_event(struct sock *sk, enum tcp_ca_event event)
 {
 	if (event == CA_EVENT_TX_START) {
 		struct bictcp *ca = inet_csk_ca(sk);
@@ -319,7 +319,7 @@ tcp_friendliness:
 	ca->cnt = max(ca->cnt, 2U);
 }
 
-static void bictcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
+static void cubictcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct bictcp *ca = inet_csk_ca(sk);
@@ -338,7 +338,7 @@ static void bictcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
 	tcp_cong_avoid_ai(tp, ca->cnt, acked);
 }
 
-static u32 bictcp_recalc_ssthresh(struct sock *sk)
+static u32 cubictcp_recalc_ssthresh(struct sock *sk)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
 	struct bictcp *ca = inet_csk_ca(sk);
@@ -355,7 +355,7 @@ static u32 bictcp_recalc_ssthresh(struct sock *sk)
 	return max((tp->snd_cwnd * beta) / BICTCP_BETA_SCALE, 2U);
 }
 
-static void bictcp_state(struct sock *sk, u8 new_state)
+static void cubictcp_state(struct sock *sk, u8 new_state)
 {
 	if (new_state == TCP_CA_Loss) {
 		bictcp_reset(inet_csk_ca(sk));
@@ -442,7 +442,7 @@ static void hystart_update(struct sock *sk, u32 delay)
 	}
 }
 
-static void bictcp_acked(struct sock *sk, const struct ack_sample *sample)
+static void cubictcp_acked(struct sock *sk, const struct ack_sample *sample)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
 	struct bictcp *ca = inet_csk_ca(sk);
@@ -471,13 +471,13 @@ static void bictcp_acked(struct sock *sk, const struct ack_sample *sample)
 }
 
 static struct tcp_congestion_ops cubictcp __read_mostly = {
-	.init		= bictcp_init,
-	.ssthresh	= bictcp_recalc_ssthresh,
-	.cong_avoid	= bictcp_cong_avoid,
-	.set_state	= bictcp_state,
+	.init		= cubictcp_init,
+	.ssthresh	= cubictcp_recalc_ssthresh,
+	.cong_avoid	= cubictcp_cong_avoid,
+	.set_state	= cubictcp_state,
 	.undo_cwnd	= tcp_reno_undo_cwnd,
-	.cwnd_event	= bictcp_cwnd_event,
-	.pkts_acked     = bictcp_acked,
+	.cwnd_event	= cubictcp_cwnd_event,
+	.pkts_acked     = cubictcp_acked,
 	.owner		= THIS_MODULE,
 	.name		= "cubic",
 };