netdev - [PATCH V2 bpf-next 1/2] bpf: add perf-event notificaton support for sock

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Date:   Wed,  7 Nov 2018 16:12:01 -0800
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     sowmini.varadhan@...cle.com, daniel@...earbox.net,
        netdev@...r.kernel.org, davem@...emloft.net, brakmo@...com,
        ast@...nel.org
Subject: [PATCH V2 bpf-next 1/2] bpf: add perf-event notificaton support for sock_ops

This patch allows eBPF programs that use sock_ops to send
perf-based event notifications using bpf_perf_event_output()

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
---
 net/core/filter.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index e521c5e..23464a3 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4048,6 +4048,23 @@ static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
 	return ret;
 }
 
+BPF_CALL_5(bpf_sock_opts_event_output, struct bpf_sock_ops *, skops,
+	   struct bpf_map *, map, u64, flags, void *, data, u64, size)
+{
+	return bpf_event_output(map, flags, data, size, NULL, 0, NULL);
+}
+
+static const struct bpf_func_proto bpf_sock_ops_event_output_proto =  {
+	.func		= bpf_sock_opts_event_output,
+	.gpl_only       = true,
+	.ret_type       = RET_INTEGER,
+	.arg1_type      = ARG_PTR_TO_CTX,
+	.arg2_type      = ARG_CONST_MAP_PTR,
+	.arg3_type      = ARG_ANYTHING,
+	.arg4_type      = ARG_PTR_TO_MEM,
+	.arg5_type      = ARG_CONST_SIZE_OR_ZERO,
+};
+
 static const struct bpf_func_proto bpf_setsockopt_proto = {
 	.func		= bpf_setsockopt,
 	.gpl_only	= false,
@@ -5226,6 +5243,8 @@ bool bpf_helper_changes_pkt_data(void *func)
 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 {
 	switch (func_id) {
+	case BPF_FUNC_perf_event_output:
+		return &bpf_sock_ops_event_output_proto;
 	case BPF_FUNC_setsockopt:
 		return &bpf_setsockopt_proto;
 	case BPF_FUNC_getsockopt:
-- 
1.7.1