From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <dev-bounces@dpdk.org>
Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124])
	by inbox.dpdk.org (Postfix) with ESMTP id 7A79843DEE;
	Wed,  3 Apr 2024 18:34:51 +0200 (CEST)
Received: from mails.dpdk.org (localhost [127.0.0.1])
	by mails.dpdk.org (Postfix) with ESMTP id D609F402E4;
	Wed,  3 Apr 2024 18:34:46 +0200 (CEST)
Received: from mail-pf1-f178.google.com (mail-pf1-f178.google.com
 [209.85.210.178])
 by mails.dpdk.org (Postfix) with ESMTP id A1B9C40144
 for <dev@dpdk.org>; Wed,  3 Apr 2024 18:34:44 +0200 (CEST)
Received: by mail-pf1-f178.google.com with SMTP id
 d2e1a72fcca58-6ecbe6dc8c6so2415970b3a.1
 for <dev@dpdk.org>; Wed, 03 Apr 2024 09:34:44 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1712162084;
 x=1712766884; darn=dpdk.org; 
 h=content-transfer-encoding:mime-version:references:in-reply-to
 :message-id:date:subject:cc:to:from:from:to:cc:subject:date
 :message-id:reply-to;
 bh=Gc9056QOjuVYfhf4bhMSmsFklkfUlX/P5ar793xxAkA=;
 b=nycGzxfs+9dhHl6U0V75zn46rFZADHCYdEfhRNgHsLeNEIs22D96lJRKYaHqIHFYNG
 r/ep8+gmwynLYqRmY/1b6DGwsLflSsjNIhbpMVbii9L7yMFuDGy5wvth73Y1LRj3sFqp
 BFsRP40y8BHuR/D02oirPF2e/6Wtu3ZJSM330ob6SRFHqpnWe6USakyg53dYEXu1C/hE
 zoitUOKfpW8N45MfgfYNRdncD0cxTrexVMT2SZ0dfP/tBbIG+HKuJLKNRIfas5oKX3T1
 GzXneSKWEgCSviX3ewkeENvH1LQ4oKqCl6YFHj2o4dSNRvwL281ruQshHHl2zB2Kf3Ac
 b2Cg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20230601; t=1712162084; x=1712766884;
 h=content-transfer-encoding:mime-version:references:in-reply-to
 :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc
 :subject:date:message-id:reply-to;
 bh=Gc9056QOjuVYfhf4bhMSmsFklkfUlX/P5ar793xxAkA=;
 b=CokqNG1FEv9GmTq5+h78P+zNjM7EFT5Vp0ackbcXzuliM/nNOpm2tAWGl3IWKSjGJc
 XIMtEF1x5j/5NQ6F+udIWGGZ02Uu1bDnLJYCOgIrEFfUPDy6yYO74ATy+7Bl45UxId/6
 3+hdcEd+XNIY3p1PDSDdJ4MPrDKvyZwbdB+8JpMXZ8bR7LGNsJ/4sZcloF62rGERzSlW
 /oAXrLNm25cze4eZIWi7oeM6h/fOv6fLQdFdxYVWcad6dY6w7BSfQfL5RN6hxPaAvsOx
 PQQgzekCLJwOVcbHryff5iPyIsB5JKtIUMbRbEuAPFufbho67NIE3cqJSl9SRR25HtSJ
 QPNw==
X-Gm-Message-State: AOJu0YykMtTs25RDL/5N1s5jhK8Kf/XxPL8aXcZBfb8NC/svssL8K8xB
 aEqCqyq1sNbQoi5A7LQj0CW7QTDvVZZNgVlRfW2a3TUOBOPd6d0vy4d/gYTz8oXdgeGsiqQaxq+
 DyBVVOw==
X-Google-Smtp-Source: AGHT+IEIb9/xukvgHeJvwIvKz8OCy/6hhntEbwYTE06dH5UeugVAQ6+98SvTsv6e7RvWw8NlHtq6yQ==
X-Received: by 2002:a05:6a21:398b:b0:1a7:34c:185d with SMTP id
 ad11-20020a056a21398b00b001a7034c185dmr170902pzc.59.1712162083837; 
 Wed, 03 Apr 2024 09:34:43 -0700 (PDT)
Received: from hermes.local (204-195-96-226.wavecable.com. [204.195.96.226])
 by smtp.gmail.com with ESMTPSA id
 a6-20020aa78e86000000b006e5a09708f8sm12332364pfr.174.2024.04.03.09.34.43
 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);
 Wed, 03 Apr 2024 09:34:43 -0700 (PDT)
From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: Stephen Hemminger <stephen@networkplumber.org>
Subject: [PATCH 1/2] eal: add functions to generate uuid values
Date: Wed,  3 Apr 2024 09:32:29 -0700
Message-ID: <20240403163432.437275-2-stephen@networkplumber.org>
X-Mailer: git-send-email 2.43.0
In-Reply-To: <20240403163432.437275-1-stephen@networkplumber.org>
References: <20240403163432.437275-1-stephen@networkplumber.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org

Useful to be able to generate uuid values for tests or
for interaction with other subsystems as magic cookie.
Naming and overall algorithm come from libuuid which is used
by permission of original author.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/eal/common/eal_common_uuid.c | 56 ++++++++++++++++++++++++++++++++
 lib/eal/include/rte_uuid.h       | 22 ++++++++++++-
 lib/eal/version.map              |  2 ++
 3 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/lib/eal/common/eal_common_uuid.c b/lib/eal/common/eal_common_uuid.c
index 0a80bfbb38..fc8f58e8a4 100644
--- a/lib/eal/common/eal_common_uuid.c
+++ b/lib/eal/common/eal_common_uuid.c
@@ -7,7 +7,12 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <ctype.h>
+#include <time.h>
 
+#include <rte_atomic.h>
+#include <rte_common.h>
+#include <rte_random.h>
+#include <rte_time.h>
 #include <rte_uuid.h>
 
 /* UUID packed form */
@@ -165,3 +170,54 @@ void rte_uuid_unparse(const rte_uuid_t uu, char *out, size_t len)
 		uuid.node[0], uuid.node[1], uuid.node[2],
 		uuid.node[3], uuid.node[4], uuid.node[5]);
 }
+
+void rte_uuid_generate_random(rte_uuid_t out)
+{
+	union {
+		uint64_t words[2];
+		rte_uuid_t uuid;
+	} buf;
+	struct uuid uu;
+
+	/* UUID is 128 bit */
+	buf.words[0] = rte_rand();
+	buf.words[1] = rte_rand();
+
+	/* Mark these random bytes a version 4 random uuid */
+	uuid_unpack(buf.uuid, &uu);
+	uu.clock_seq = (uu.clock_seq & 0x3FFF) | 0x8000;
+	uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) | 0x4000;
+	uuid_pack(&uu, out);
+}
+
+void rte_uuid_generate_time(rte_uuid_t out)
+{
+	struct uuid uu;
+	struct timespec ts;
+	uint64_t ns, rnd;
+	static uint16_t sequence;
+
+	/* The time value for UUID is 100ns since 15 October 1582 */
+	clock_gettime(CLOCK_REALTIME, &ts);
+
+	ns = ts.tv_nsec / 100;
+	ns += (uint64_t) ts.tv_sec * (NSEC_PER_SEC / 100);
+	ns += (((uint64_t) 0x01B21DD2) << 32) + 0x13814000;
+
+	uu.time_low = (uint32_t) ns;
+	uu.time_mid = (uint16_t) (ns >> 32);
+	uu.time_hi_and_version = (uint16_t) (ns >> 48);
+	uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) | 0x4000;
+	uu.clock_seq = rte_atomic_fetch_add_explicit(&sequence, 1,
+						     rte_memory_order_relaxed);
+
+	rnd = rte_rand();
+	memcpy(uu.node, &rnd, 6);
+	/*
+	 * What libuuid does set multicast bit.
+	 * This avoids conflicts with network cards.
+	 */
+	uu.node[0] |= 0x1;
+
+	uuid_pack(&uu, out);
+}
diff --git a/lib/eal/include/rte_uuid.h b/lib/eal/include/rte_uuid.h
index cfefd4308a..052b78a812 100644
--- a/lib/eal/include/rte_uuid.h
+++ b/lib/eal/include/rte_uuid.h
@@ -18,6 +18,8 @@ extern "C" {
 #include <stddef.h>
 #include <string.h>
 
+#include <rte_compat.h>
+
 /**
  * Struct describing a Universal Unique Identifier
  */
@@ -94,12 +96,30 @@ int	rte_uuid_parse(const char *in, rte_uuid_t uu);
  * @param uu
  *    UUID to format
  * @param out
- *    Resulting string buffer
+ *    Resulting string bufferm
  * @param len
  *    Sizeof the available string buffer
  */
 void	rte_uuid_unparse(const rte_uuid_t uu, char *out, size_t len);
 
+/**
+ * Generate a random uuid
+ *
+ * @param uu
+ *   Resulting UUID
+ */
+__rte_experimental
+void   rte_uuid_generate_random(rte_uuid_t uu);
+
+/**
+ * Generate a uuid based on time stamp.
+ *
+ * @param uu
+ *   Resulting UUID
+ */
+__rte_experimental
+void   rte_uuid_generate_time(rte_uuid_t uu);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/eal/version.map b/lib/eal/version.map
index 3df50c3fbb..5a8aa67244 100644
--- a/lib/eal/version.map
+++ b/lib/eal/version.map
@@ -396,6 +396,8 @@ EXPERIMENTAL {
 
 	# added in 24.03
 	rte_vfio_get_device_info; # WINDOWS_NO_EXPORT
+	rte_uuid_generate_random;
+	rte_uuid_generate_time;
 };
 
 INTERNAL {
-- 
2.43.0