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Message-ID: <20250806154122.3413330-7-wintera@linux.ibm.com>
Date: Wed, 6 Aug 2025 17:41:11 +0200
From: Alexandra Winter <wintera@...ux.ibm.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
Andrew Lunn <andrew+netdev@...n.ch>,
"D. Wythe" <alibuda@...ux.alibaba.com>,
Dust Li <dust.li@...ux.alibaba.com>,
Sidraya Jayagond <sidraya@...ux.ibm.com>,
Wenjia Zhang <wenjia@...ux.ibm.com>,
Julian Ruess <julianr@...ux.ibm.com>
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Thorsten Winkler <twinkler@...ux.ibm.com>,
Simon Horman <horms@...nel.org>,
Mahanta Jambigi <mjambigi@...ux.ibm.com>,
Tony Lu <tonylu@...ux.alibaba.com>, Wen Gu <guwen@...ux.alibaba.com>,
Halil Pasic <pasic@...ux.ibm.com>, linux-rdma@...r.kernel.org
Subject: [RFC net-next 06/17] net/dibs: Create net/dibs
Create an 'DIBS' shim layer that will provide generic functionality and
declarations for dibs device drivers and dibs clients.
Following patches will add functionality.
Signed-off-by: Alexandra Winter <wintera@...ux.ibm.com>
---
MAINTAINERS | 7 +++++++
include/linux/dibs.h | 42 ++++++++++++++++++++++++++++++++++++++++++
net/Kconfig | 1 +
net/Makefile | 1 +
net/dibs/Kconfig | 14 ++++++++++++++
net/dibs/Makefile | 7 +++++++
net/dibs/dibs_main.c | 39 +++++++++++++++++++++++++++++++++++++++
7 files changed, 111 insertions(+)
create mode 100644 include/linux/dibs.h
create mode 100644 net/dibs/Kconfig
create mode 100644 net/dibs/Makefile
create mode 100644 net/dibs/dibs_main.c
diff --git a/MAINTAINERS b/MAINTAINERS
index b968bc6959d1..e28d92f64236 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12948,6 +12948,13 @@ F: Documentation/devicetree/bindings/hwmon/renesas,isl28022.yaml
F: Documentation/hwmon/isl28022.rst
F: drivers/hwmon/isl28022.c
+DIBS (DIRECT INTERNAL BUFFER SHARING)
+M: Alexandra Winter <wintera@...ux.ibm.com>
+L: netdev@...r.kernel.org
+S: Supported
+F: include/linux/dibs.h
+F: net/dibs/
+
ISOFS FILESYSTEM
M: Jan Kara <jack@...e.cz>
L: linux-fsdevel@...r.kernel.org
diff --git a/include/linux/dibs.h b/include/linux/dibs.h
new file mode 100644
index 000000000000..3f4175aaa732
--- /dev/null
+++ b/include/linux/dibs.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Direct Internal Buffer Sharing
+ *
+ * Definitions for the DIBS module
+ *
+ * Copyright IBM Corp. 2025
+ */
+#ifndef _DIBS_H
+#define _DIBS_H
+
+/* DIBS - Direct Internal Buffer Sharing - concept
+ * -----------------------------------------------
+ * In the case of multiple system sharing the same hardware, dibs fabrics can
+ * provide dibs devices to these systems. The systems use dibs devices of the
+ * same fabric to communicate via dmbs (Direct Memory Buffers). Each dmb has
+ * exactly one owning local dibs device and one remote using dibs device, that
+ * is authorized to write into this dmb. This access control is provided by the
+ * dibs fabric.
+ *
+ * Because the access to the dmb is based on access to physical memory, it is
+ * lossless and synchronous. The remote devices can directly access any offset
+ * of the dmb.
+ *
+ * Dibs fabrics, dibs devices and dmbs are identified by tokens and ids.
+ * Dibs fabric id is unique within the same hardware (with the exception of the
+ * dibs loopback fabric), dmb token is unique within the same fabric, dibs
+ * device gids are guaranteed to be unique within the same fabric and
+ * statistically likely to be globally unique. The exchange of these tokens and
+ * ids between the systems is not part of the dibs concept.
+ *
+ * The dibs layer provides an abstraction between dibs device drivers and dibs
+ * clients.
+ */
+
+#define MAX_DIBS_CLIENTS 8
+
+struct dibs_client {
+ const char *name;
+};
+
+#endif /* _DIBS_H */
diff --git a/net/Kconfig b/net/Kconfig
index d5865cf19799..5410226f314b 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -87,6 +87,7 @@ source "net/tls/Kconfig"
source "net/xfrm/Kconfig"
source "net/iucv/Kconfig"
source "net/smc/Kconfig"
+source "net/dibs/Kconfig"
source "net/xdp/Kconfig"
config NET_HANDSHAKE
diff --git a/net/Makefile b/net/Makefile
index aac960c41db6..3e4771cfe48e 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_TIPC) += tipc/
obj-$(CONFIG_NETLABEL) += netlabel/
obj-$(CONFIG_IUCV) += iucv/
obj-$(CONFIG_SMC) += smc/
+obj-$(CONFIG_DIBS) += dibs/
obj-$(CONFIG_RFKILL) += rfkill/
obj-$(CONFIG_NET_9P) += 9p/
obj-$(CONFIG_CAIF) += caif/
diff --git a/net/dibs/Kconfig b/net/dibs/Kconfig
new file mode 100644
index 000000000000..968c52938708
--- /dev/null
+++ b/net/dibs/Kconfig
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+config DIBS
+ tristate "DIBS support"
+ default n
+ help
+ Direct Internal Buffer Sharing (DIBS)
+ A communication method that uses common physical (internal) memory
+ for synchronous direct access into a remote buffer.
+
+ Select this option to provide the abstraction layer between
+ dibs devices and dibs clients like the SMC protocol.
+
+ To compile as a module choose M. The module name is dibs.
+ If unsure, choose N.
diff --git a/net/dibs/Makefile b/net/dibs/Makefile
new file mode 100644
index 000000000000..825dec431bfc
--- /dev/null
+++ b/net/dibs/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# DIBS class module
+#
+
+dibs-y += dibs_main.o
+obj-$(CONFIG_DIBS) += dibs.o
diff --git a/net/dibs/dibs_main.c b/net/dibs/dibs_main.c
new file mode 100644
index 000000000000..348242fd05dd
--- /dev/null
+++ b/net/dibs/dibs_main.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DIBS - Direct Internal Buffer Sharing
+ *
+ * Implementation of the DIBS class module
+ *
+ * Copyright IBM Corp. 2025
+ */
+#define KMSG_COMPONENT "dibs"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/dibs.h>
+
+MODULE_DESCRIPTION("Direct Internal Buffer Sharing class");
+MODULE_LICENSE("GPL");
+
+/* use an array rather a list for fast mapping: */
+static struct dibs_client *clients[MAX_DIBS_CLIENTS];
+static u8 max_client;
+
+static int __init dibs_init(void)
+{
+ memset(clients, 0, sizeof(clients));
+ max_client = 0;
+
+ pr_info("module loaded\n");
+ return 0;
+}
+
+static void __exit dibs_exit(void)
+{
+ pr_info("module unloaded\n");
+}
+
+module_init(dibs_init);
+module_exit(dibs_exit);
--
2.48.1
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