From: Martin KaFai Lau <kafai@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Eric Dumazet <edumazet@google.com>, <kernel-team@fb.com>,
Lawrence Brakmo <brakmo@fb.com>,
Neal Cardwell <ncardwell@google.com>, <netdev@vger.kernel.org>,
Yuchung Cheng <ycheng@google.com>
Subject: [PATCH v3 bpf-next 5/9] bpf: sock_ops: Change some members of sock_ops_kern from u32 to u8
Date: Thu, 30 Jul 2020 13:57:30 -0700 [thread overview]
Message-ID: <20200730205730.3354047-1-kafai@fb.com> (raw)
In-Reply-To: <20200730205657.3351905-1-kafai@fb.com>
A latter patch needs to add a few pointers and a few u8 to
sock_ops_kern. Hence, this patch saves some spaces by moving
some of the existing members from u32 to u8 so that the latter
patch can still fit everything in a cacheline.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
---
include/linux/filter.h | 4 ++--
net/core/filter.c | 15 ++++++++++-----
2 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 0a355b005bf4..c427dfa5f908 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -1236,13 +1236,13 @@ struct bpf_sock_addr_kern {
struct bpf_sock_ops_kern {
struct sock *sk;
- u32 op;
union {
u32 args[4];
u32 reply;
u32 replylong[4];
};
- u32 is_fullsock;
+ u8 op;
+ u8 is_fullsock;
u64 temp; /* temp and everything after is not
* initialized to 0 before calling
* the BPF program. New fields that
diff --git a/net/core/filter.c b/net/core/filter.c
index 0a1bf520c55d..4adfc90b221e 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -8406,17 +8406,22 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
return insn - insn_buf;
switch (si->off) {
- case offsetof(struct bpf_sock_ops, op) ...
+ case offsetof(struct bpf_sock_ops, op):
+ *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
+ op),
+ si->dst_reg, si->src_reg,
+ offsetof(struct bpf_sock_ops_kern, op));
+ break;
+
+ case offsetof(struct bpf_sock_ops, replylong[0]) ...
offsetof(struct bpf_sock_ops, replylong[3]):
- BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, op) !=
- sizeof_field(struct bpf_sock_ops_kern, op));
BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) !=
sizeof_field(struct bpf_sock_ops_kern, reply));
BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) !=
sizeof_field(struct bpf_sock_ops_kern, replylong));
off = si->off;
- off -= offsetof(struct bpf_sock_ops, op);
- off += offsetof(struct bpf_sock_ops_kern, op);
+ off -= offsetof(struct bpf_sock_ops, replylong[0]);
+ off += offsetof(struct bpf_sock_ops_kern, replylong[0]);
if (type == BPF_WRITE)
*insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
off);
--
2.24.1
next prev parent reply other threads:[~2020-07-30 20:57 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-30 20:56 [PATCH v3 bpf-next 0/9] BPF TCP header options Martin KaFai Lau
2020-07-30 20:57 ` [PATCH v3 bpf-next 1/9] tcp: Use a struct to represent a saved_syn Martin KaFai Lau
2020-07-31 15:57 ` Eric Dumazet
2020-07-31 17:31 ` Eric Dumazet
2020-07-30 20:57 ` [PATCH v3 bpf-next 2/9] tcp: bpf: Add TCP_BPF_DELACK_MAX setsockopt Martin KaFai Lau
2020-07-30 20:57 ` [PATCH v3 bpf-next 3/9] tcp: bpf: Add TCP_BPF_RTO_MIN for bpf_setsockopt Martin KaFai Lau
2020-07-30 20:57 ` [PATCH v3 bpf-next 4/9] tcp: Add unknown_opt arg to tcp_parse_options Martin KaFai Lau
2020-07-31 16:12 ` Eric Dumazet
2020-07-31 17:37 ` Martin KaFai Lau
2020-07-30 20:57 ` Martin KaFai Lau [this message]
2020-07-30 20:57 ` [PATCH v3 bpf-next 6/9] bpf: tcp: Allow bpf prog to write and parse TCP header option Martin KaFai Lau
2020-07-31 16:06 ` Eric Dumazet
2020-07-31 17:59 ` Martin KaFai Lau
2020-07-30 20:57 ` [PATCH v3 bpf-next 7/9] bpf: selftests: Add fastopen_connect to network_helpers Martin KaFai Lau
2020-07-30 20:57 ` [PATCH v3 bpf-next 8/9] bpf: selftests: tcp header options Martin KaFai Lau
2020-07-30 20:57 ` [PATCH v3 bpf-next 9/9] tcp: bpf: Optionally store mac header in TCP_SAVE_SYN Martin KaFai Lau
2020-07-31 15:51 ` Eric Dumazet
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