diff options
author | Jörn-Thorben Hinz <jthinz@mailbox.tu-berlin.de> | 2022-06-22 21:12:24 +0200 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2022-06-23 09:49:57 -0700 |
commit | 9f0265e921dee14096943ee11f793fa076aa7a72 (patch) | |
tree | 24bcc369f281f23bf64702a6432529dcbf2a7677 /net/ipv4/bpf_tcp_ca.c | |
parent | 41c95dd6a604dc3f5fae55c99c138cc8e7fec76e (diff) |
bpf: Require only one of cong_avoid() and cong_control() from a TCP CC
Remove the check for required and optional functions in a struct
tcp_congestion_ops from bpf_tcp_ca.c. Rely on
tcp_register_congestion_control() to reject a BPF CC that does not
implement all required functions, as it will do for a non-BPF CC.
When a CC implements tcp_congestion_ops.cong_control(), the alternate
cong_avoid() is not in use in the TCP stack. Previously, a BPF CC was
still forced to implement cong_avoid() as a no-op since it was
non-optional in bpf_tcp_ca.c.
Signed-off-by: Jörn-Thorben Hinz <jthinz@mailbox.tu-berlin.de>
Reviewed-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220622191227.898118-3-jthinz@mailbox.tu-berlin.de
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/ipv4/bpf_tcp_ca.c')
-rw-r--r-- | net/ipv4/bpf_tcp_ca.c | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c index 1f5c53ede4e5..7a181631b995 100644 --- a/net/ipv4/bpf_tcp_ca.c +++ b/net/ipv4/bpf_tcp_ca.c @@ -14,18 +14,6 @@ /* "extern" is to avoid sparse warning. It is only used in bpf_struct_ops.c. */ extern struct bpf_struct_ops bpf_tcp_congestion_ops; -static u32 optional_ops[] = { - offsetof(struct tcp_congestion_ops, init), - offsetof(struct tcp_congestion_ops, release), - offsetof(struct tcp_congestion_ops, set_state), - offsetof(struct tcp_congestion_ops, cwnd_event), - offsetof(struct tcp_congestion_ops, in_ack_event), - offsetof(struct tcp_congestion_ops, pkts_acked), - offsetof(struct tcp_congestion_ops, min_tso_segs), - offsetof(struct tcp_congestion_ops, sndbuf_expand), - offsetof(struct tcp_congestion_ops, cong_control), -}; - static u32 unsupported_ops[] = { offsetof(struct tcp_congestion_ops, get_info), }; @@ -51,18 +39,6 @@ static int bpf_tcp_ca_init(struct btf *btf) return 0; } -static bool is_optional(u32 member_offset) -{ - unsigned int i; - - for (i = 0; i < ARRAY_SIZE(optional_ops); i++) { - if (member_offset == optional_ops[i]) - return true; - } - - return false; -} - static bool is_unsupported(u32 member_offset) { unsigned int i; @@ -246,7 +222,6 @@ static int bpf_tcp_ca_init_member(const struct btf_type *t, { const struct tcp_congestion_ops *utcp_ca; struct tcp_congestion_ops *tcp_ca; - int prog_fd; u32 moff; utcp_ca = (const struct tcp_congestion_ops *)udata; @@ -268,14 +243,6 @@ static int bpf_tcp_ca_init_member(const struct btf_type *t, return 1; } - if (!btf_type_resolve_func_ptr(btf_vmlinux, member->type, NULL)) - return 0; - - /* Ensure bpf_prog is provided for compulsory func ptr */ - prog_fd = (int)(*(unsigned long *)(udata + moff)); - if (!prog_fd && !is_optional(moff) && !is_unsupported(moff)) - return -EINVAL; - return 0; } |