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Code Issues Releases Wiki Activity

Implement zero-copy API for zwave_proxy (#10836)

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Co-authored-by: Keith Burzinski <kbx81x@gmail.com>
This commit is contained in:
J. Nick Koston
2025-09-23 15:12:54 -05:00
committed by GitHub
parent e9c2e211ef
commit 365e3afa9b
5 changed files with 15 additions and 14 deletions
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2
esphome/components/api/api.proto
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@@ -2292,7 +2292,7 @@ message ZWaveProxyFrame {
option (ifdef) = "USE_ZWAVE_PROXY";
option (no_delay) = true;
bytes data = 1 [(fixed_array_size) = 257];
bytes data = 1 [(pointer_to_buffer) = true];
}
enum ZWaveProxyRequestType {

9
esphome/components/api/api_pb2.cpp
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@@ -3035,12 +3035,9 @@ bool UpdateCommandRequest::decode_32bit(uint32_t field_id, Proto32Bit value) {
bool ZWaveProxyFrame::decode_length(uint32_t field_id, ProtoLengthDelimited value) {
switch (field_id) {
case 1: {
const std::string &data_str = value.as_string();
this->data_len = data_str.size();
if (this->data_len > 257) {
this->data_len = 257;
}
memcpy(this->data, data_str.data(), this->data_len);
// Use raw data directly to avoid allocation
this->data = value.data();
this->data_len = value.size();
break;
}
default:

4
esphome/components/api/api_pb2.h
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@@ -2931,11 +2931,11 @@ class UpdateCommandRequest final : public CommandProtoMessage {
class ZWaveProxyFrame final : public ProtoDecodableMessage {
public:
static constexpr uint8_t MESSAGE_TYPE = 128;
static constexpr uint8_t ESTIMATED_SIZE = 33;
static constexpr uint8_t ESTIMATED_SIZE = 19;
#ifdef HAS_PROTO_MESSAGE_DUMP
const char *message_name() const override { return "z_wave_proxy_frame"; }
#endif
uint8_t data[257]{};
const uint8_t *data{nullptr};
uint16_t data_len{0};
void encode(ProtoWriteBuffer buffer) const override;
void calculate_size(ProtoSize &size) const override;

8
esphome/components/zwave_proxy/zwave_proxy.cpp
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@@ -106,14 +106,14 @@ void ZWaveProxy::process_uart_() {
}
ESP_LOGV(TAG, "Sending to client: %s", YESNO(this->api_connection_ != nullptr));
if (this->api_connection_ != nullptr) {
// minimize copying to reduce CPU overhead
// Zero-copy: point directly to our buffer
this->outgoing_proto_msg_.data = this->buffer_.data();
if (this->in_bootloader_) {
this->outgoing_proto_msg_.data_len = this->buffer_index_;
} else {
// If this is a data frame, use frame length indicator + 2 (for SoF + checksum), else assume 1 for ACK/NAK/CAN
this->outgoing_proto_msg_.data_len = this->buffer_[0] == ZWAVE_FRAME_TYPE_START ? this->buffer_[1] + 2 : 1;
}
std::memcpy(this->outgoing_proto_msg_.data, this->buffer_.data(), this->outgoing_proto_msg_.data_len);
this->api_connection_->send_message(this->outgoing_proto_msg_, api::ZWaveProxyFrame::MESSAGE_TYPE);
}
}
@@ -272,7 +272,9 @@ void ZWaveProxy::parse_start_(uint8_t byte) {
}
// Forward response (ACK/NAK/CAN) back to client for processing
if (this->api_connection_ != nullptr) {
this->outgoing_proto_msg_.data[0] = byte;
// Store single byte in buffer and point to it
this->buffer_[0] = byte;
this->outgoing_proto_msg_.data = this->buffer_.data();
this->outgoing_proto_msg_.data_len = 1;
this->api_connection_->send_message(this->outgoing_proto_msg_, api::ZWaveProxyFrame::MESSAGE_TYPE);
}

6
esphome/components/zwave_proxy/zwave_proxy.h
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@@ -11,6 +11,8 @@
namespace esphome {
namespace zwave_proxy {
static constexpr size_t MAX_ZWAVE_FRAME_SIZE = 257; // Maximum Z-Wave frame size
enum ZWaveResponseTypes : uint8_t {
ZWAVE_FRAME_TYPE_ACK = 0x06,
ZWAVE_FRAME_TYPE_CAN = 0x18,
@@ -66,8 +68,8 @@ class ZWaveProxy : public uart::UARTDevice, public Component {
// Pre-allocated message - always ready to send
api::ZWaveProxyFrame outgoing_proto_msg_;
std::array<uint8_t, sizeof(api::ZWaveProxyFrame::data)> buffer_; // Fixed buffer for incoming data
std::array<uint8_t, 4> home_id_{0, 0, 0, 0}; // Fixed buffer for home ID
std::array<uint8_t, MAX_ZWAVE_FRAME_SIZE> buffer_; // Fixed buffer for incoming data
std::array<uint8_t, 4> home_id_{0, 0, 0, 0}; // Fixed buffer for home ID
// Pointers and 32-bit values (aligned together)
api::APIConnection *api_connection_{nullptr}; // Current subscribed client