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From: "Stephan Müller" <smueller@chronox.de>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-crypto@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	linux-api@vger.kernel.org,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"Alexander E. Patrakov" <patrakov@gmail.com>,
	"Ahmed S. Darwish" <darwish.07@gmail.com>,
	"Theodore Y. Ts'o" <tytso@mit.edu>, Willy Tarreau <w@1wt.eu>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	Vito Caputo <vcaputo@pengaru.com>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	Jan Kara <jack@suse.cz>, Ray Strode <rstrode@redhat.com>,
	William Jon McCann <mccann@jhu.edu>,
	zhangjs <zachary@baishancloud.com>,
	Andy Lutomirski <luto@kernel.org>,
	Florian Weimer <fweimer@redhat.com>,
	Lennart Poettering <mzxreary@0pointer.de>,
	Nicolai Stange <nstange@suse.de>,
	"Peter, Matthias" <matthias.peter@bsi.bund.de>,
	Marcelo Henrique Cerri <marcelo.cerri@canonical.com>,
	Roman Drahtmueller <draht@schaltsekun.de>,
	Neil Horman <nhorman@redhat.com>
Subject: [PATCH v25 02/12] LRNG - allocate one SDRNG instance per NUMA node
Date: Sat, 16 Nov 2019 10:33:44 +0100
Message-ID: <3759500.8VvTC6uiIP@positron.chronox.de> (raw)
In-Reply-To: <2787174.DQlWHN5GGo@positron.chronox.de>

In order to improve NUMA-locality when serving getrandom(2) requests,
allocate one DRNG instance per node.

The SDRNG instance that is present right from the start of the kernel is
reused as the first per-NUMA-node SDRNG. For all remaining online NUMA
nodes a new SDRNG instance is allocated.

During boot time, the multiple SDRNG instances are seeded sequentially.
With this, the first SDRNG instance (referenced as the initial SDRNG
in the code) is completely seeded with 256 bits of entropy before the
next SDRNG instance is completely seeded.

When random numbers are requested, the NUMA-node-local SDRNG is checked
whether it has been already fully seeded. If this is not the case, the
initial SDRNG is used to serve the request.

CC: "Eric W. Biederman" <ebiederm@xmission.com>
CC: "Alexander E. Patrakov" <patrakov@gmail.com>
CC: "Ahmed S. Darwish" <darwish.07@gmail.com>
CC: "Theodore Y. Ts'o" <tytso@mit.edu>
CC: Willy Tarreau <w@1wt.eu>
CC: Matthew Garrett <mjg59@srcf.ucam.org>
CC: Vito Caputo <vcaputo@pengaru.com>
CC: Andreas Dilger <adilger.kernel@dilger.ca>
CC: Jan Kara <jack@suse.cz>
CC: Ray Strode <rstrode@redhat.com>
CC: William Jon McCann <mccann@jhu.edu>
CC: zhangjs <zachary@baishancloud.com>
CC: Andy Lutomirski <luto@kernel.org>
CC: Florian Weimer <fweimer@redhat.com>
CC: Lennart Poettering <mzxreary@0pointer.de>
CC: Nicolai Stange <nstange@suse.de>
Reviewed-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Reviewed-by: Roman Drahtmueller <draht@schaltsekun.de>
Tested-by: Roman Drahtmüller <draht@schaltsekun.de>
Tested-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Tested-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Stephan Mueller <smueller@chronox.de>
---
 drivers/char/lrng/Makefile        |   2 +
 drivers/char/lrng/lrng_internal.h |   5 ++
 drivers/char/lrng/lrng_numa.c     | 101 ++++++++++++++++++++++++++++++
 3 files changed, 108 insertions(+)
 create mode 100644 drivers/char/lrng/lrng_numa.c

diff --git a/drivers/char/lrng/Makefile b/drivers/char/lrng/Makefile
index 2761623715d2..a00cddb45773 100644
--- a/drivers/char/lrng/Makefile
+++ b/drivers/char/lrng/Makefile
@@ -7,3 +7,5 @@ obj-y				+= lrng_pool.o lrng_aux.o \
 				   lrng_sw_noise.o lrng_archrandom.o \
 				   lrng_sdrng.o lrng_chacha20.o \
 				   lrng_interfaces.o \
+
+obj-$(CONFIG_NUMA)		+= lrng_numa.o
diff --git a/drivers/char/lrng/lrng_internal.h b/drivers/char/lrng/lrng_internal.h
index a3d9e0bce884..e1f9b6b166fd 100644
--- a/drivers/char/lrng/lrng_internal.h
+++ b/drivers/char/lrng/lrng_internal.h
@@ -250,8 +250,13 @@ int lrng_sdrng_get_sleep(u8 *outbuf, u32 outbuflen);
 void lrng_sdrng_force_reseed(void);
 void lrng_sdrng_seed_work(struct work_struct *dummy);
 
+#ifdef CONFIG_NUMA
+struct lrng_sdrng **lrng_sdrng_instances(void);
+void lrng_drngs_numa_alloc(void);
+#else	/* CONFIG_NUMA */
 static inline struct lrng_sdrng **lrng_sdrng_instances(void) { return NULL; }
 static inline void lrng_drngs_numa_alloc(void) { return; }
+#endif /* CONFIG_NUMA */
 
 /************************** Health Test linking code **************************/
 
diff --git a/drivers/char/lrng/lrng_numa.c b/drivers/char/lrng/lrng_numa.c
new file mode 100644
index 000000000000..5401f927919a
--- /dev/null
+++ b/drivers/char/lrng/lrng_numa.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+/*
+ * LRNG NUMA support
+ *
+ * Copyright (C) 2016 - 2019, Stephan Mueller <smueller@chronox.de>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/lrng.h>
+#include <linux/slab.h>
+
+#include "lrng_internal.h"
+
+static struct lrng_sdrng **lrng_sdrng __read_mostly = NULL;
+
+struct lrng_sdrng **lrng_sdrng_instances(void)
+{
+	return lrng_sdrng;
+}
+
+/* Allocate the data structures for the per-NUMA node DRNGs */
+static void _lrng_drngs_numa_alloc(struct work_struct *work)
+{
+	struct lrng_sdrng **sdrngs;
+	struct lrng_sdrng *lrng_sdrng_init = lrng_sdrng_init_instance();
+	u32 node;
+	bool init_sdrng_used = false;
+
+	mutex_lock(&lrng_crypto_cb_update);
+
+	/* per-NUMA-node DRNGs are already present */
+	if (lrng_sdrng)
+		goto unlock;
+
+	sdrngs = kcalloc(nr_node_ids, sizeof(void *), GFP_KERNEL|__GFP_NOFAIL);
+	for_each_online_node(node) {
+		struct lrng_sdrng *sdrng;
+
+		if (!init_sdrng_used) {
+			sdrngs[node] = lrng_sdrng_init;
+			init_sdrng_used = true;
+			continue;
+		}
+
+		sdrng = kmalloc_node(sizeof(struct lrng_sdrng),
+				     GFP_KERNEL|__GFP_NOFAIL, node);
+		memset(sdrng, 0, sizeof(lrng_sdrng));
+
+		sdrng->crypto_cb = lrng_sdrng_init->crypto_cb;
+		sdrng->sdrng = sdrng->crypto_cb->lrng_drng_alloc(
+					LRNG_DRNG_SECURITY_STRENGTH_BYTES);
+		if (IS_ERR(sdrng->sdrng)) {
+			kfree(sdrng);
+			goto err;
+		}
+
+		mutex_init(&sdrng->lock);
+		spin_lock_init(&sdrng->spin_lock);
+
+		/*
+		 * No reseeding of NUMA DRNGs from previous DRNGs as this
+		 * would complicate the code. Let it simply reseed.
+		 */
+		lrng_sdrng_reset(sdrng);
+		sdrngs[node] = sdrng;
+
+		lrng_pool_inc_numa_node();
+		pr_info("secondary DRNG for NUMA node %d allocated\n", node);
+	}
+
+	/* Ensure that all NUMA nodes receive changed memory here. */
+	mb();
+
+	if (!cmpxchg(&lrng_sdrng, NULL, sdrngs))
+		goto unlock;
+
+err:
+	for_each_online_node(node) {
+		struct lrng_sdrng *sdrng = sdrngs[node];
+
+		if (sdrng == lrng_sdrng_init)
+			continue;
+
+		if (sdrng) {
+			sdrng->crypto_cb->lrng_drng_dealloc(sdrng->sdrng);
+			kfree(sdrng);
+		}
+	}
+	kfree(sdrngs);
+
+unlock:
+	mutex_unlock(&lrng_crypto_cb_update);
+}
+
+static DECLARE_WORK(lrng_drngs_numa_alloc_work, _lrng_drngs_numa_alloc);
+
+void lrng_drngs_numa_alloc(void)
+{
+	schedule_work(&lrng_drngs_numa_alloc_work);
+}
-- 
2.23.0





  parent reply index

Thread overview: 162+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-11 18:17 [PATCH v24 00/12] /dev/random - a new approach with full SP800-90B compliance Stephan Müller
2019-11-11 18:18 ` [PATCH v24 01/12] Linux Random Number Generator Stephan Müller
2019-11-11 23:54   ` Thomas Gleixner
2019-11-12  2:25     ` Stephan Müller
2019-11-12 10:16       ` Thomas Gleixner
2019-11-12 22:30   ` kbuild test robot
2019-11-12 23:15     ` Stephan Müller
2019-11-13  0:14   ` kbuild test robot
2019-11-13  0:25     ` Stephan Müller
2019-11-24  4:51   ` Sandy Harris
2019-11-24  9:02     ` Stephan Mueller
2019-11-11 18:19 ` [PATCH v24 02/12] LRNG - allocate one SDRNG instance per NUMA node Stephan Müller
2019-11-11 18:20 ` [PATCH v24 03/12] LRNG - /proc interface Stephan Müller
2019-11-11 18:20 ` [PATCH v24 04/12] LRNG - add switchable DRNG support Stephan Müller
2019-11-11 18:21 ` [PATCH v24 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller
2019-11-11 18:21 ` [PATCH v24 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller
2019-11-11 18:22 ` [PATCH v24 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller
2019-11-11 18:23 ` [PATCH v24 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller
2019-11-11 18:23 ` [PATCH v24 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller
2019-11-11 18:24 ` [PATCH v24 10/12] LRNG - add TRNG support Stephan Müller
2019-11-11 18:26 ` [PATCH v24 11/12] LRNG - add SP800-90B compliant health tests Stephan Müller
2019-11-12 19:58   ` Alexander E. Patrakov
2019-11-12 23:11     ` Stephan Müller
2019-11-13  0:36     ` Stephan Müller
2019-11-13  6:02       ` Alexander E. Patrakov
2019-11-14  1:46         ` Stephan Müller
2019-11-11 18:26 ` [PATCH v24 12/12] LRNG - add interface for gathering of raw entropy Stephan Müller
2019-11-12 20:55   ` kbuild test robot
2019-11-12 23:13     ` Stephan Müller
2019-11-12 13:23 ` [PATCH v24 00/12] /dev/random - a new approach with full SP800-90B compliance Florian Weimer
2019-11-12 22:43   ` Stephan Müller
2019-11-12 15:33 ` Andy Lutomirski
2019-11-12 23:03   ` Stephan Müller
2019-11-12 23:26     ` Stephan Müller
2019-11-13  4:24   ` Stephan Müller
2019-11-13  4:48     ` Andy Lutomirski
2019-11-13 12:16       ` Stephan Müller
2019-11-16  9:32 ` [PATCH v25 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller
2019-11-16  9:33   ` [PATCH v25 01/12] Linux Random Number Generator Stephan Müller
2019-11-16 11:25     ` Thomas Gleixner
2019-11-17 10:30       ` Stephan Müller
2019-11-16 18:13     ` Nicolai Stange
2019-11-17 11:01       ` Stephan Müller
2019-11-16  9:33   ` Stephan Müller [this message]
2019-11-16  9:34   ` [PATCH v25 03/12] LRNG - /proc interface Stephan Müller
2019-11-16 16:39     ` Andy Lutomirski
2019-11-17 12:16       ` Stephan Müller
2019-11-19 10:06         ` Andy Lutomirski
2019-11-19 10:55           ` Stephan Mueller
2019-11-19 17:40             ` Andy Lutomirski
2019-11-16 23:36     ` ebiederm
2019-11-17 11:37       ` Stephan Müller
2019-11-16  9:34   ` [PATCH v25 04/12] LRNG - add switchable DRNG support Stephan Müller
2019-11-16  9:35   ` [PATCH v25 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller
2019-11-16  9:35   ` [PATCH v25 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller
2019-11-16  9:35   ` [PATCH v25 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller
2019-11-16  9:36   ` [PATCH v25 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller
2019-11-16  9:36   ` [PATCH v25 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller
2019-11-20 13:33     ` Neil Horman
2019-11-20 20:07       ` Stephan Müller
2019-11-21 14:19         ` Neil Horman
2019-11-21 14:33           ` Stephan Mueller
2019-11-16  9:37   ` [PATCH v25 10/12] LRNG - add TRNG support Stephan Müller
2019-11-16 16:09     ` Andy Lutomirski
2019-11-17 11:10       ` Stephan Müller
2019-11-19 10:07         ` Andy Lutomirski
2019-11-19 10:46           ` Stephan Mueller
2019-11-19 12:41           ` Greg Kroah-Hartman
2019-11-20  8:58             ` Stephan Müller
2019-11-20  9:55               ` Alexander E. Patrakov
2019-11-20 13:29               ` Greg Kroah-Hartman
2019-11-20 19:51                 ` Stephan Müller
2019-11-20 19:57                   ` Alexander E. Patrakov
2019-11-20 20:32                   ` Greg Kroah-Hartman
2019-11-21 13:06                     ` Stephan Müller
2019-11-16  9:37   ` [PATCH v25 11/12] LRNG - add SP800-90B compliant health tests Stephan Müller
2019-11-16  9:38   ` [PATCH v25 12/12] LRNG - add interface for gathering of raw entropy Stephan Müller
2019-11-16 16:51     ` Andy Lutomirski
2019-11-17 22:55       ` Stephan Müller
2019-11-19 10:04         ` Andy Lutomirski
2019-11-19 17:17     ` Randy Dunlap
2019-11-20  9:01       ` Stephan Müller
2019-11-21 12:18     ` Nicolai Stange
2019-11-21 15:18       ` Stephan Müller
2019-11-23 20:08   ` [PATCH v26 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller
2019-11-23 20:10     ` [PATCH v26 01/12] Linux Random Number Generator Stephan Müller
2019-11-24 22:44       ` kbuild test robot
2019-11-25  6:29         ` Stephan Mueller
2019-11-23 20:10     ` [PATCH v26 02/12] LRNG - allocate one SDRNG instance per NUMA node Stephan Müller
2019-11-23 20:11     ` [PATCH v26 03/12] LRNG - sysctls and /proc interface Stephan Müller
2019-11-23 20:11     ` [PATCH v26 04/12] LRNG - add switchable DRNG support Stephan Müller
2019-11-23 20:31     ` [PATCH v26 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller
2019-11-23 20:32     ` [PATCH v26 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller
2019-11-23 20:32     ` [PATCH v26 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller
2019-11-23 20:33     ` [PATCH v26 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller
2019-11-23 20:34     ` [PATCH v26 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller
2019-11-23 20:34     ` [PATCH v26 10/12] LRNG - add TRNG support Stephan Müller
2019-11-23 20:34     ` [PATCH v26 11/12] LRNG - add SP800-90B compliant health tests Stephan Müller
2019-11-23 20:35     ` [PATCH v26 12/12] LRNG - add interface for gathering of raw entropy Stephan Müller
2020-01-09  8:29     ` [PATCH v27 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller
2020-01-09  8:30       ` [PATCH v27 01/12] Linux Random Number Generator Stephan Müller
2020-01-16  6:09         ` kbuild test robot
2020-01-16  6:41           ` Stephan Mueller
2020-01-09  8:31       ` [PATCH v27 02/12] LRNG - allocate one DRNG instance per NUMA node Stephan Müller
2020-01-09  8:31       ` [PATCH v27 03/12] LRNG - sysctls and /proc interface Stephan Müller
2020-01-09  8:32       ` [PATCH v27 04/12] LRNG - add switchable DRNG support Stephan Müller
2020-01-11  7:09         ` kbuild test robot
2020-01-12 10:12           ` Stephan Müller
2020-01-09  8:32       ` [PATCH v27 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller
2020-01-09  8:32       ` [PATCH v27 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller
2020-01-09  8:33       ` [PATCH v27 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller
2020-01-09  8:33       ` [PATCH v27 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller
2020-01-09  8:34       ` [PATCH v27 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller
2020-01-10  0:24         ` Randy Dunlap
2020-01-10  7:45           ` Stephan Mueller
2020-01-09  8:34       ` [PATCH v27 10/12] LRNG - add SP800-90B compliant health tests Stephan Müller
2020-01-10  0:20         ` Randy Dunlap
2020-01-10  8:27           ` Stephan Mueller
2020-01-09  8:35       ` [PATCH v27 11/12] LRNG - add interface for gathering of raw entropy Stephan Müller
2020-01-09  8:35       ` [PATCH v27 12/12] LRNG - add power-on and runtime self-tests Stephan Müller
2020-01-10  0:22         ` Randy Dunlap
2020-01-10  7:48           ` Stephan Mueller
2020-01-13 10:39         ` Dan Carpenter
2020-01-13 10:46           ` Stephan Mueller
2020-01-15 10:31       ` [PATCH v28 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller
2020-01-15 10:31         ` [PATCH v28 01/12] Linux Random Number Generator Stephan Müller
2020-01-16  0:11           ` Randy Dunlap
2020-01-16  7:22             ` Stephan Mueller
2020-01-15 10:32         ` [PATCH v28 02/12] LRNG - allocate one DRNG instance per NUMA node Stephan Müller
2020-01-15 10:32         ` [PATCH v28 03/12] LRNG - sysctls and /proc interface Stephan Müller
2020-01-15 10:32         ` [PATCH v28 04/12] LRNG - add switchable DRNG support Stephan Müller
2020-01-15 10:33         ` [PATCH v28 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller
2020-01-15 10:33         ` [PATCH v28 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller
2020-01-16  0:14           ` Randy Dunlap
2020-01-16  6:55             ` Stephan Mueller
2020-01-15 10:34         ` [PATCH v28 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller
2020-01-16  0:15           ` Randy Dunlap
2020-01-16  6:54             ` Stephan Mueller
2020-01-15 10:34         ` [PATCH v28 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller
2020-01-15 10:34         ` [PATCH v28 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller
2020-01-16  0:17           ` Randy Dunlap
2020-01-16  6:51             ` Stephan Mueller
2020-01-15 10:35         ` [PATCH v28 10/12] LRNG - add SP800-90B compliant health tests Stephan Müller
2020-01-15 10:35         ` [PATCH v28 11/12] LRNG - add interface for gathering of raw entropy Stephan Müller
2020-01-16  0:18           ` Randy Dunlap
2020-01-16  6:43             ` Stephan Mueller
2020-01-16  6:48               ` Randy Dunlap
2020-01-16  6:52                 ` Stephan Mueller
2020-01-15 10:36         ` [PATCH v28 12/12] LRNG - add power-on and runtime self-tests Stephan Müller
2020-01-19 21:12         ` [PATCH v29 00/12] /dev/random - a new approach with full SP800-90B Stephan Müller
2020-01-19 21:13           ` [PATCH v29 01/12] Linux Random Number Generator Stephan Müller
2020-01-19 21:13           ` [PATCH v29 02/12] LRNG - allocate one DRNG instance per NUMA node Stephan Müller
2020-01-19 21:14           ` [PATCH v29 03/12] LRNG - sysctls and /proc interface Stephan Müller
2020-01-19 21:14           ` [PATCH v29 04/12] LRNG - add switchable DRNG support Stephan Müller
2020-01-19 21:15           ` [PATCH v29 05/12] crypto: DRBG - externalize DRBG functions for LRNG Stephan Müller
2020-01-19 21:16           ` [PATCH v29 06/12] LRNG - add SP800-90A DRBG extension Stephan Müller
2020-01-19 21:16           ` [PATCH v29 07/12] LRNG - add kernel crypto API PRNG extension Stephan Müller
2020-01-19 21:17           ` [PATCH v29 08/12] crypto: provide access to a static Jitter RNG state Stephan Müller
2020-01-19 21:18           ` [PATCH v29 09/12] LRNG - add Jitter RNG fast noise source Stephan Müller
2020-01-19 21:18           ` [PATCH v29 10/12] LRNG - add SP800-90B compliant health tests Stephan Müller
2020-01-19 21:19           ` [PATCH v29 11/12] LRNG - add interface for gathering of raw entropy Stephan Müller
2020-01-19 21:20           ` [PATCH v29 12/12] LRNG - add power-on and runtime self-tests Stephan Müller

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	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git