QUIC FIFD

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19206)

4 files changed, 149 insertions, 101 deletions

diff --git a/doc/designs/quic-design/images/quic-overview.odg b/doc/designs/quic-design/images/quic-overview.odg
index a844a0deb7..c8a055760b 100644
--- a/doc/designs/quic-design/images/quic-overview.odg
+++ b/doc/designs/quic-design/images/quic-overview.odg
diff --git a/doc/designs/quic-design/images/quic-overview.svg b/doc/designs/quic-design/images/quic-overview.svg
index fbc81cc764..4bb82282a6 100644
--- a/doc/designs/quic-design/images/quic-overview.svg
+++ b/doc/designs/quic-design/images/quic-overview.svg
@@ -11,57 +11,58 @@
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+        <text class="SVGTextShape"><tspan class="TextParagraph" font-family="DejaVu Sans, sans-serif" font-size="423px" font-weight="400"><tspan class="TextPosition" x="13530" y="10899"><tspan fill="rgb(0,0,0)" stroke="none">ACK Handling And</tspan></tspan></tspan><tspan class="TextParagraph" font-family="DejaVu Sans, sans-serif" font-size="423px" font-weight="400"><tspan class="TextPosition" x="13992" y="11469"><tspan fill="rgb(0,0,0)" stroke="none">Loss Detector</tspan></tspan></tspan></text>
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         <path fill="rgb(0,0,0)" stroke="none" d="M 5762,14652 L 6070,14580 5965,14410 5762,14652 Z"/>
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diff --git a/doc/designs/quic-design/quic-fifm.md b/doc/designs/quic-design/quic-fifm.md
index 1de81318f3..f03b5d7d36 100644
--- a/doc/designs/quic-design/quic-fifm.md
+++ b/doc/designs/quic-design/quic-fifm.md
@@ -133,7 +133,7 @@ metadata associated with it:
   to the `TX` state. If the packet it was sent in is subsequently lost,
   it is transitioned back to the `NEW` state.
 
-Packets in the `NEW` state participate in a priority queue (the NEW queue)
+Frames in the `NEW` state participate in a priority queue (the NEW queue)
 according to their priority and the CFQ's NEW queue can be iterated in priority
 order by callers.
 
@@ -304,9 +304,9 @@ allocation made per transmitted packet. The TX packetiser will obtain
 a `QUIC_TXPIM_PKT` structure from the TXPIM, fill in the structure including
 the ACK Manager data, and submit it via the FIFD which we introduce below.
 
-The TXPIM does not anything with the `QUIC_TXPIM_PKT` structure itself
-other than managing its allocation and manipulation. Constructive
-use of the data kept in the TXPIM is made by the FIFD.
+The TXPIM does do not anything with the `QUIC_TXPIM_PKT` structure itself other
+than managing its allocation and manipulation. Constructive use of the data kept
+in the TXPIM is made by the FIFD.
 
 ### API
 
@@ -328,10 +328,11 @@ typedef struct quic_txpim_pkt_st {
     QUIC_FIFD          *fifd;
 
     /* Regenerate-strategy frames. */
-    unsigned int        had_handshake_done      : 1;
-    unsigned int        had_max_data_frame      : 1;
-    unsigned int        had_max_streams_frame   : 1;
-    unsigned int        had_ack_frame           : 1;
+    unsigned int        had_handshake_done          : 1;
+    unsigned int        had_max_data_frame          : 1;
+    unsigned int        had_max_streams_bidi_frame  : 1;
+    unsigned int        had_max_streams_uni_frame   : 1;
+    unsigned int        had_ack_frame               : 1;
 
     /* Private data follows. */
 } QUIC_TXPIM_PKT;
@@ -392,6 +393,12 @@ const QUIC_TXPIM_CHUNK *ossl_quic_txpim_pkt_get_chunks(QUIC_TXPIM_PKT *fpkt);
  * ossl_quic_txpim_pkt_get_chunks().
  */
 size_t ossl_quic_txpim_pkt_get_num_chunks(QUIC_TXPIM_PKT *fpkt);
+
+/*
+ * Returns the number of QUIC_TXPIM_PKTs allocated by the given TXPIM that have
+ * yet to be returned to the TXPIM.
+ */
+size_t ossl_quic_txpim_get_in_use(QUIC_TXPIM *txpim);
 ```
 
 The Frame-in-Flight Dispatcher (FIFD)
@@ -432,7 +439,7 @@ simply glues all of these parts together.
 ### API
 
 ```c
-typedef struct quic_fifm_st {
+typedef struct quic_fifd_st {
   /* (internals) */
 } QUIC_FIFD;
 
@@ -476,9 +483,6 @@ Typical Intended TX Packetiser Usage
   all CFQ frames are considered of higher priority). For each such frame
   it places in a packet, it:
 
-  - informs the CFQ that the CFQ item has been transmitted, causing a
-    transition of the CFQ item to the `TX` state;
-
   - calls `ossl_quic_txpim_pkt_add_cfq_item()` on the TXPIM to log the CFQ item
     as having been transmitted in the given packet, so that the CFQ item can be
     released or requeued depending on the ultimate fate of the packet.
@@ -497,7 +501,9 @@ Typical Intended TX Packetiser Usage
 
 - TX Packetiser calls `ossl_quic_fifd_pkt_commit()`. The FIFD takes care
   of submitting the packet to the ACK Manager and provides its own callback
-  implementation.
+  implementation. It also takes care of informing the CFQ that any CFQ items
+  which were added via `ossl_quic_txpim_pkt_add_cfq_item()` have been
+  transmitted.
 
   In the event of packet loss, ACK or discard, the appropriate QUIC Send Stream,
   CFQ and regenerate callback calls are made. Regardless of the outcome, the
diff --git a/doc/designs/quic-design/quic-overview.md b/doc/designs/quic-design/quic-overview.md
index 141abcb9bc..2ef43cefc5 100644
--- a/doc/designs/quic-design/quic-overview.md
+++ b/doc/designs/quic-design/quic-overview.md
@@ -21,6 +21,13 @@ SSL_read and SSL_write functions.
 They will be bypassed with a single-copy API for read and write (_not
 for MVP_).
 
+Frame in Flight Manager
+-----------------------
+
+The frame in flight manager manages the queueing of frames which may need to be
+retransmitted if the packets in which they were transmitted were lost. It is
+[discussed in more detail here.](./quic-fifm.md)
+
 Connection State Machine
 ------------------------
 
@@ -65,12 +72,17 @@ either as data or as events to the subsequent modules based on the frame
 type. Flow Controller And Statistics Collector is consulted for decisions
 and to record the statistics of the received stream data.
 
-Flow Controller And Statistics Collector
-----------------------------------------
+Flow Controller
+---------------
+
+This module is consulted by the TX Packetizer and RX Frame Handler for flow
+control decisions at both the stream and connection levels.
+
+Statistics Collector
+--------------------
 
-This module collects various statistics about send and received
-stream data. It is also consulted by the TX Packetizer and RX Frame
-Handler for flow control decisions.
+This module maintains statistics about a connection, most notably the estimated
+round trip time to the remote peer.
 
 QUIC Write Record Layer
 -----------------------