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Zero-copy ethernet TX: encode directly into prepend_buffer, add info/test skills

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This commit is contained in:
Ian Gulliver
2026-04-12 07:50:20 +09:00
parent 846d6bb201
commit 761b740c10
6 changed files with 40 additions and 12 deletions
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9
firmware/lib/net.cpp
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@@ -52,11 +52,14 @@ static void handle_udp(std::span<const uint8_t> frame, span_writer& tx) {
uint16_t dst_port = uhdr->src_port;
msg_handler(pb.remaining().subspan(0, payload_len),
[dst_mac, dst_ip, dst_port](std::span<const uint8_t> resp_data) {
[dst_mac, dst_ip, dst_port](encode_fn encode) {
prepend_buffer<4096> buf;
buf.append_copy(resp_data);
span_writer out(buf.payload_ptr(), 2048);
auto r = encode(out);
if (!r) return;
buf.append(*r);
udp::prepend(buf, dst_mac, state.mac, state.ip, dst_ip,
PICOMAP_PORT, dst_port, resp_data.size());
PICOMAP_PORT, dst_port, *r);
net_send_raw(buf.span());
});
}