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Message-ID: <20250806154122.3413330-10-wintera@linux.ibm.com>
Date: Wed, 6 Aug 2025 17:41:14 +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 09/17] net/dibs: Define dibs loopback
The first stage of loopback-ism was implemented as part of the
SMC module [1]. Now that we have the dibs layer, provide access to a
dibs_loopback device to all dibs clients.
This is the first step of moving loopback-ism from net/smc/smc_loopback.*
to net/dibs/dibs_loopback.*. One global structure lo_dev is allocated
and added to the dibs devices. Follow-on patches will move functionality.
Same as smc_loopback, dibs_loopback is provided by a config option.
Note that there is no way to dynamically add or remove the loopback
device. That could be a future improvement.
When moving code to net/dibs, replace ism_ prefix with dibs_ prefix.
As this is mostly a move of existing code, copyright and authors are
unchanged.
Link: https://lore.kernel.org/lkml/20240428060738.60843-1-guwen@linux.alibaba.com/ [1]
Signed-off-by: Alexandra Winter <wintera@...ux.ibm.com>
---
net/dibs/Kconfig | 13 +++++++
net/dibs/Makefile | 1 +
net/dibs/dibs_loopback.c | 77 ++++++++++++++++++++++++++++++++++++++++
net/dibs/dibs_loopback.h | 38 ++++++++++++++++++++
net/dibs/dibs_main.c | 14 ++++++--
5 files changed, 141 insertions(+), 2 deletions(-)
create mode 100644 net/dibs/dibs_loopback.c
create mode 100644 net/dibs/dibs_loopback.h
diff --git a/net/dibs/Kconfig b/net/dibs/Kconfig
index 968c52938708..9a6182391b25 100644
--- a/net/dibs/Kconfig
+++ b/net/dibs/Kconfig
@@ -12,3 +12,16 @@ config DIBS
To compile as a module choose M. The module name is dibs.
If unsure, choose N.
+
+config DIBS_LO
+ bool "intra-OS shortcut with dibs loopback"
+ depends on DIBS
+ default n
+ help
+ DIBS_LO enables the creation of an software-emulated dibs device
+ named lo which can be used for transferring data when communication
+ occurs within the same OS. This helps in convenient testing of
+ dibs clients, since dibs loopback is independent of architecture or
+ hardware.
+
+ if unsure, say N.
diff --git a/net/dibs/Makefile b/net/dibs/Makefile
index 825dec431bfc..85805490c77f 100644
--- a/net/dibs/Makefile
+++ b/net/dibs/Makefile
@@ -5,3 +5,4 @@
dibs-y += dibs_main.o
obj-$(CONFIG_DIBS) += dibs.o
+dibs-$(CONFIG_DIBS_LO) += dibs_loopback.o
\ No newline at end of file
diff --git a/net/dibs/dibs_loopback.c b/net/dibs/dibs_loopback.c
new file mode 100644
index 000000000000..c221b55d24a2
--- /dev/null
+++ b/net/dibs/dibs_loopback.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Functions for dibs loopback/loopback-ism device.
+ *
+ * Copyright (c) 2024, Alibaba Inc.
+ *
+ * Author: Wen Gu <guwen@...ux.alibaba.com>
+ * Tony Lu <tonylu@...ux.alibaba.com>
+ *
+ */
+
+#include <linux/dibs.h>
+#include <linux/types.h>
+
+#include "dibs_loopback.h"
+
+/* global loopback device */
+static struct dibs_lo_dev *lo_dev;
+
+static void dibs_lo_dev_exit(struct dibs_lo_dev *ldev)
+{
+ dibs_dev_del(ldev->dibs);
+}
+
+static int dibs_lo_dev_probe(void)
+{
+ struct dibs_lo_dev *ldev;
+ struct dibs_dev *dibs;
+ int ret;
+
+ ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
+ if (!ldev)
+ return -ENOMEM;
+
+ dibs = dibs_dev_alloc();
+ if (!dibs) {
+ kfree(ldev);
+ return -ENOMEM;
+ }
+
+ ldev->dibs = dibs;
+
+ ret = dibs_dev_add(dibs);
+ if (ret)
+ goto err_reg;
+ lo_dev = ldev;
+ return 0;
+
+err_reg:
+ /* pairs with dibs_dev_alloc() */
+ kfree(dibs);
+ kfree(ldev);
+
+ return ret;
+}
+
+static void dibs_lo_dev_remove(void)
+{
+ if (!lo_dev)
+ return;
+
+ dibs_lo_dev_exit(lo_dev);
+ /* pairs with dibs_dev_alloc() */
+ kfree(lo_dev->dibs);
+ kfree(lo_dev);
+ lo_dev = NULL;
+}
+
+int dibs_loopback_init(void)
+{
+ return dibs_lo_dev_probe();
+}
+
+void dibs_loopback_exit(void)
+{
+ dibs_lo_dev_remove();
+}
diff --git a/net/dibs/dibs_loopback.h b/net/dibs/dibs_loopback.h
new file mode 100644
index 000000000000..fd03b6333a24
--- /dev/null
+++ b/net/dibs/dibs_loopback.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * dibs loopback (aka loopback-ism) device structure definitions.
+ *
+ * Copyright (c) 2024, Alibaba Inc.
+ *
+ * Author: Wen Gu <guwen@...ux.alibaba.com>
+ * Tony Lu <tonylu@...ux.alibaba.com>
+ *
+ */
+
+#ifndef _DIBS_LOOPBACK_H
+#define _DIBS_LOOPBACK_H
+
+#include <linux/dibs.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+
+#if IS_ENABLED(CONFIG_DIBS_LO)
+
+struct dibs_lo_dev {
+ struct dibs_dev *dibs;
+};
+
+int dibs_loopback_init(void);
+void dibs_loopback_exit(void);
+#else
+static inline int dibs_loopback_init(void)
+{
+ return 0;
+}
+
+static inline void dibs_loopback_exit(void)
+{
+}
+#endif
+
+#endif /* _DIBS_LOOPBACK_H */
diff --git a/net/dibs/dibs_main.c b/net/dibs/dibs_main.c
index 5345e41ae5e4..2c213e1f8f93 100644
--- a/net/dibs/dibs_main.c
+++ b/net/dibs/dibs_main.c
@@ -14,6 +14,8 @@
#include <linux/err.h>
#include <linux/dibs.h>
+#include "dibs_loopback.h"
+
MODULE_DESCRIPTION("Direct Internal Buffer Sharing class");
MODULE_LICENSE("GPL");
@@ -94,15 +96,23 @@ EXPORT_SYMBOL_GPL(dibs_dev_del);
static int __init dibs_init(void)
{
+ int rc;
+
memset(clients, 0, sizeof(clients));
max_client = 0;
- pr_info("module loaded\n");
- return 0;
+ rc = dibs_loopback_init();
+ if (rc)
+ pr_err("%s fails with %d\n", __func__, rc);
+ else
+ pr_info("module loaded\n");
+
+ return rc;
}
static void __exit dibs_exit(void)
{
+ dibs_loopback_exit();
pr_info("module unloaded\n");
}
--
2.48.1
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