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Date: Thu, 22 Nov 2018 17:38:49 -0800 From: John Fastabend <john.fastabend@...il.com> To: ast@...nel.org, daniel@...earbox.net Cc: john.fastabend@...il.com, netdev@...r.kernel.org Subject: [PATCH bpf-next 2/3] bpf: add msg_pop_data helper to tools Add the necessary header definitions to tools for new msg_pop_data_helper. Signed-off-by: John Fastabend <john.fastabend@...il.com> --- tools/include/uapi/linux/bpf.h | 13 ++++++++++++- tools/testing/selftests/bpf/bpf_helpers.h | 2 ++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index c1554aa..95cf7a5 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -2268,6 +2268,16 @@ union bpf_attr { * * Return * 0 on success, or a negative error in case of failure. + * + * int bpf_msg_pop_data(struct sk_msg_buff *msg, u32 start, u32 pop, u64 flags) + * Description + * Will remove 'pop' bytes from a msg starting at byte 'start'. + * This result in ENOMEM errors under certain situations where + * a allocation and copy are required due to a full ring buffer. + * However, the helper will try to avoid doing the allocation + * if possible. Other errors can occur if input parameters are + * invalid either do to start byte not being valid part of msg + * payload and/or pop value being to large. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -2360,7 +2370,8 @@ union bpf_attr { FN(map_push_elem), \ FN(map_pop_elem), \ FN(map_peek_elem), \ - FN(msg_push_data), + FN(msg_push_data), \ + FN(msg_pop_data), /* integer value in 'imm' field of BPF_CALL instruction selects which helper * function eBPF program intends to call diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h index 686e57c..7b69519 100644 --- a/tools/testing/selftests/bpf/bpf_helpers.h +++ b/tools/testing/selftests/bpf/bpf_helpers.h @@ -113,6 +113,8 @@ static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) = (void *) BPF_FUNC_msg_pull_data; static int (*bpf_msg_push_data)(void *ctx, int start, int end, int flags) = (void *) BPF_FUNC_msg_push_data; +static int (*bpf_msg_pop_data)(void *ctx, int start, int cut, int flags) = + (void *) BPF_FUNC_msg_pop_data; static int (*bpf_bind)(void *ctx, void *addr, int addr_len) = (void *) BPF_FUNC_bind; static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) = -- 2.7.4
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