From: Stefan Metzmacher <metze@samba.org>
Date: Thu, 14 Aug 2025 09:41:59 +0000 (+0200)
Subject: smb: smbdirect: introduce smbdirect_socket.rw_io.credits
X-Git-Tag: v6.18-rc1~225^2~151
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=90255ed46774bda93a945a6dbf9228d9ecfcd79f;p=thirdparty%2Fkernel%2Fstable.git

smb: smbdirect: introduce smbdirect_socket.rw_io.credits

This will be used by the server to manage the state
for RDMA read/write requests.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/smb/common/smbdirect/smbdirect_socket.h b/fs/smb/common/smbdirect/smbdirect_socket.h
index e1454ccf849b9..148e8dbf1254c 100644
--- a/fs/smb/common/smbdirect/smbdirect_socket.h
+++ b/fs/smb/common/smbdirect/smbdirect_socket.h
@@ -159,6 +159,27 @@ struct smbdirect_socket {
 			bool full_packet_received;
 		} reassembly;
 	} recv_io;
+
+	/*
+	 * The state for RDMA read/write requests on the server
+	 */
+	struct {
+		/*
+		 * The credit state for the send side
+		 */
+		struct {
+			/*
+			 * The maximum number of rw credits
+			 */
+			size_t max;
+			/*
+			 * The number of pages per credit
+			 */
+			size_t num_pages;
+			atomic_t count;
+			wait_queue_head_t wait_queue;
+		} credits;
+	} rw_io;
 };
 
 static __always_inline void smbdirect_socket_init(struct smbdirect_socket *sc)
@@ -184,6 +205,9 @@ static __always_inline void smbdirect_socket_init(struct smbdirect_socket *sc)
 	INIT_LIST_HEAD(&sc->recv_io.reassembly.list);
 	spin_lock_init(&sc->recv_io.reassembly.lock);
 	init_waitqueue_head(&sc->recv_io.reassembly.wait_queue);
+
+	atomic_set(&sc->rw_io.credits.count, 0);
+	init_waitqueue_head(&sc->rw_io.credits.wait_queue);
 }
 
 struct smbdirect_send_io {