Addressed additional review comments

Signed-off-by: Chuck Ketcham <cketcham@nvidia.com>

Author: cketcham2333

docs/sphinx/examples/qec/realtime_decoding_demo/CMakeLists.txt

@@ -14,9 +14,9 @@
 #   surface_code_realtime_decoding       generator: --target stim; writes the
 #                                        decoder config + syndrome files.
 #   surface_code_realtime_decoding-cqr   lowered kernel: adds -frealtime-lowering
-#                                        -DQEC_APP_EXTERNAL_DECODING_SERVER; the
-#                                        live QPU kernel that streams syndromes to
-#                                        the delivered decoding_server over UDP.
+#                                        -DQEC_APP_CQR; the live QPU kernel that
+#                                        streams syndromes to the delivered
+#                                        decoding_server over UDP.
 #
 # The decoding_server and the FPGA playback tool are DELIVERABLES (installed,
 # not built here); run_realtime_decoding.sh resolves them from --install-prefix.

docs/sphinx/examples/qec/realtime_decoding_demo/run_realtime_decoding.sh

@@ -193,14 +193,22 @@ if [[ "$SOURCE" != "qpu-kernel" && "$SOURCE" != "fpga" ]]; then
     echo "ERROR: --source must be qpu-kernel or fpga (got '$SOURCE')" >&2; exit 1
 fi
 
+# The example source also supports 'sliding_window', but that decoder is not
+# yet supported over the realtime decoding path to the GPU (it needs matching
+# updates to the proprietary cudevice archive), so this script does not accept
+# it.
 case "$DECODER" in
     pymatching|nv-qldpc-decoder|multi_error_lut) ;;
+    sliding_window)
+       echo "ERROR: sliding_window is not yet supported over the realtime" >&2
+       echo "       decoding path to the GPU." >&2; exit 1 ;;
     *) echo "ERROR: --decoder must be pymatching, nv-qldpc-decoder, or" >&2
        echo "       multi_error_lut (got '$DECODER')" >&2; exit 1 ;;
 esac
 
 _log()  { echo "==> $*"; }
 _info() { echo "    $*"; }
+_warn() { echo "WARNING: $*" >&2; }
 _err()  { echo "ERROR: $*" >&2; }
 _banner() { echo; echo "========================================";
             echo "  $*"; echo "========================================"; echo; }
@@ -598,7 +606,7 @@ run_fpga() {
     local HSB_WQE_DEPTH=64
     local GPU_ROCE_NUM_PAGES="$HSB_WQE_DEPTH"
     if (( NUM_SLOTS > HSB_WQE_DEPTH )); then
-        _err "NUM_SLOTS=$NUM_SLOTS exceeds the HSB WQE depth ($HSB_WQE_DEPTH); clamping"
+        _warn "NUM_SLOTS=$NUM_SLOTS exceeds the HSB WQE depth ($HSB_WQE_DEPTH); clamping"
         NUM_SLOTS="$HSB_WQE_DEPTH"
     fi
     if [[ "$TRANSPORT" == "gpu_roce" ]]; then

docs/sphinx/examples_rst/qec/realtime_decoding_demo.rst

@@ -46,7 +46,7 @@ SDK — using only installed headers and libraries:
 - ``surface_code_realtime_decoding`` — the **generator** (``--target stim``):
   writes the decoder configuration and, for the FPGA source, a syndrome file.
 - ``surface_code_realtime_decoding-cqr`` — the **lowered kernel**
-  (``-frealtime-lowering -DQEC_APP_EXTERNAL_DECODING_SERVER``): the live
+  (``-frealtime-lowering -DQEC_APP_CQR``): the live
   syndrome source that streams to the server over UDP.