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[input] lgmp: make report streams mandatory

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Carry every input activation and report through its client-bound SPSC
stream. Keep the LGMP queue only for status publication and subscriber
discovery, removing transport selection and the queue-report fallback.

Retain graceful endpoint draining when a subscriber disappears and use
bounded adaptive polling while streams are active. The IDD polling setup
remains compatible with the project’s current C++ language mode.
This commit is contained in:
Geoffrey McRae
2026-08-15 14:20:59 +10:00
parent 89b1ced8fc
commit 12801df353
4 changed files with 225 additions and 502 deletions
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38
common/include/common/KVMFRInput.h
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@@ -94,10 +94,9 @@ enum
typedef uint32_t KVMFRInputMessageType;
/*
* One activation must remain on one ordered transport. CLAIM is sequence one,
* reports, KEEPALIVE and RESET increment the sequence, and RELEASE is the
* final record. A sender must start a new generation instead of moving an
* active sequence between the queue fallback and a stream endpoint.
* Input messages are carried by the client's ordered stream endpoint. CLAIM
* is sequence one, reports, KEEPALIVE and RESET increment the sequence, and
* RELEASE is the final record.
*/
typedef struct KVMFRInputMessage
{
@@ -129,14 +128,6 @@ enum
typedef uint32_t KVMFRInputStatusFlags;
enum
{
KVMFR_INPUT_TRANSPORT_QUEUE = 0x1,
KVMFR_INPUT_TRANSPORT_STREAM = 0x2,
};
typedef uint32_t KVMFRInputTransportFlags;
enum
{
KVMFR_INPUT_STREAM_ENDPOINT_AVAILABLE = 0x1,
@@ -160,6 +151,10 @@ typedef struct KVMFRInputStreamEndpoint
}
KVMFRInputStreamEndpoint;
/*
* Published through the LGMP input queue for status and stream discovery.
* KVMFRInputMessage records are carried only by the bound stream endpoint.
*/
typedef struct KVMFRInputStatus
{
uint32_t version;
@@ -171,11 +166,10 @@ typedef struct KVMFRInputStatus
// Input ownership lease duration in milliseconds.
uint32_t lease;
uint32_t maxButtons;
KVMFRInputTransportFlags transports;
uint32_t streamVersion;
uint32_t streamEndpointCount;
uint32_t streamGeneration;
uint32_t streamReserved[4];
uint32_t streamReserved[5];
KVMFRInputStreamEndpoint streamEndpoint[
KVMFR_INPUT_STREAM_ENDPOINT_COUNT];
}
@@ -196,14 +190,14 @@ static_assert(sizeof(KVMFRInputMessage) == 32,
"KVMFR input message layout changed");
static_assert(sizeof(KVMFRInputStreamEndpoint) == 48,
"KVMFR input stream endpoint layout changed");
static_assert(offsetof(KVMFRInputStatus, transports) == 32,
"KVMFR input status transport layout changed");
static_assert(offsetof(KVMFRInputStatus, streamVersion) == 32,
"KVMFR input status stream layout changed");
static_assert(offsetof(KVMFRInputStatus, streamEndpoint) == 64,
"KVMFR input stream discovery layout changed");
static_assert(sizeof(KVMFRInputStatus) == 448,
"KVMFR input status layout changed");
static_assert(sizeof(KVMFRInputMessage) <= 64,
"KVMFR input message must fit in one LGMP control message");
static_assert(sizeof(KVMFRInputMessage) <= KVMFR_INPUT_STREAM_SLOT_SIZE,
"KVMFR input message must fit in one stream record");
#elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
_Static_assert(sizeof(KVMFRInputMouseRelative) == 16,
"KVMFR relative mouse input layout changed");
@@ -219,14 +213,14 @@ _Static_assert(sizeof(KVMFRInputMessage) == 32,
"KVMFR input message layout changed");
_Static_assert(sizeof(KVMFRInputStreamEndpoint) == 48,
"KVMFR input stream endpoint layout changed");
_Static_assert(offsetof(KVMFRInputStatus, transports) == 32,
"KVMFR input status transport layout changed");
_Static_assert(offsetof(KVMFRInputStatus, streamVersion) == 32,
"KVMFR input status stream layout changed");
_Static_assert(offsetof(KVMFRInputStatus, streamEndpoint) == 64,
"KVMFR input stream discovery layout changed");
_Static_assert(sizeof(KVMFRInputStatus) == 448,
"KVMFR input status layout changed");
_Static_assert(sizeof(KVMFRInputMessage) <= 64,
"KVMFR input message must fit in one LGMP control message");
_Static_assert(sizeof(KVMFRInputMessage) <= KVMFR_INPUT_STREAM_SLOT_SIZE,
"KVMFR input message must fit in one stream record");
#endif
#endif