diff --git a/hosts/skydick/datapool.nix b/hosts/skydick/datapool.nix
index e7a5aa6..d2f5768 100644
--- a/hosts/skydick/datapool.nix
+++ b/hosts/skydick/datapool.nix
@@ -221,13 +221,18 @@
 { config, pkgs, ... }:
 
 {
-  # Build sambaFull with Spotlight/tracker support.
+  # Build sambaFull with Spotlight/tracker + SMB Direct support.
   # Fixes for tinysparql 3.x (tracker-sparql-3.0) compatibility:
   #   (1) waf only checks tracker-sparql-{2.0..0.14} — add 3.0
   #   (2) tracker 2.x API (get_async/get_finish) removed in 3.x — replace
   #       with bus_new_async/bus_new_finish connecting to localsearch miner
   #   (3) disable tevent_glib_tracker test (uses same removed API, test-only)
   #   (4) add icu for Unicode normalisation required by Spotlight
+  # SMB Direct:
+  #   (5) link against rdma-core (libibverbs + librdmacm) and pass
+  #       --with-smb-direct so smbd advertises capability 0x40 on protocol
+  #       negotiate. Lets Sequoia 15.4+ Macs upgrade SMB3 sessions onto the
+  #       RoCE fabric (same NIC/bond as NFS-RDMA, distinct fabric port 5445).
   nixpkgs.overlays = [
     (final: prev: {
       sambaFull = prev.sambaFull.overrideAttrs (old: {
@@ -235,6 +240,10 @@
           final.tinysparql.dev
           final.glib.dev
           final.icu.dev
+          final.rdma-core
+        ];
+        configureFlags = (old.configureFlags or []) ++ [
+          "--with-smb-direct"
         ];
         postPatch = (old.postPatch or "") + ''
           substituteInPlace source3/wscript \
@@ -466,13 +475,25 @@
         "hosts deny" = "ALL";
 
         # Keep Samba on Linux defaults for socket buffers and multichannel.
-        # skydick's active 10 GbE NIC already exposes RSS queues, so manual
-        # interface capability tags or fixed SO_RCVBUF/SO_SNDBUF tuning would
-        # add complexity without a measured benefit.
+        # The 2×40 GbE bond40g (ConnectX-3) already exposes RSS queues; manual
+        # `interfaces capability` tagging or fixed SO_RCVBUF/SO_SNDBUF tuning
+        # would add complexity without a measured benefit.
 
         "map to guest" = "never";
         "server min protocol" = "SMB2_10";
 
+        # SMB-Direct (SMB3 over RDMA, port 5445). Requires the sambaFull
+        # override above to be built --with-smb-direct AND a client that
+        # supports it (Win 10 Pro for Workstations, Win Server, macOS
+        # Sequoia 15.4+). For clients without SMB-Direct, smbd silently
+        # falls back to plain TCP on 445.
+        "smb direct" = "yes";
+        # Max single RDMA read/write per call. 8 MiB matches our NFS
+        # rsize/wsize so SMB and NFS use comparable transfer sizes over
+        # the same fabric.
+        "smb direct max read" = "8388608";
+        "smb direct max write" = "8388608";
+
         "load printers" = "no";
         "vfs objects" = "catia fruit streams_xattr recycle";
         "fruit:metadata" = "stream";