This patch adds a new function to the EAL API:
int rte_eal_primary_proc_alive(const char *path);
The function indicates if a primary process is alive right now.
This functionality is implemented by testing for a write-
lock on the config file, and the function tests for a lock.
The use case for this functionality is that a secondary
process can wait until a primary process starts by polling
the function and waiting. When the primary is running, the
secondary continues to poll to detect if the primary process
has quit unexpectedly, the secondary process can detect this.
The RTE_MAGIC number is written to the shared config by the
primary process, this is the signal to the secondary process
that the EAL is set up, and ready to be used. The function
rte_eal_mcfg_complete() writes RTE_MAGIC. This has been
delayed in the EAL init proceedure, as the PCI probing in
the primary process can interfere with the secondary running.
Signed-off-by: Harry van Haaren
---
v4:
- Rebased to git head (2.3 -> 16.04 changes)
v3:
- Fixed Copyright years
v2:
- Passing NULL as const char* uses default /var/run/.rte_config
- Moved code into /common/ instead of /linuxapp/, should work on BSD now
doc/guides/rel_notes/release_16_04.rst | 6 +++
lib/librte_eal/bsdapp/eal/Makefile | 1 +
lib/librte_eal/bsdapp/eal/rte_eal_version.map | 1 +
lib/librte_eal/common/eal_common_proc.c | 61 +
lib/librte_eal/common/include/rte_eal.h | 21 -
lib/librte_eal/linuxapp/eal/Makefile| 3 +-
lib/librte_eal/linuxapp/eal/eal.c | 6 +--
lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 +
8 files changed, 95 insertions(+), 5 deletions(-)
create mode 100644 lib/librte_eal/common/eal_common_proc.c
diff --git a/doc/guides/rel_notes/release_16_04.rst
b/doc/guides/rel_notes/release_16_04.rst
index 5786f74..8893ad5 100644
--- a/doc/guides/rel_notes/release_16_04.rst
+++ b/doc/guides/rel_notes/release_16_04.rst
@@ -62,6 +62,12 @@ This section should contain bug fixes added to the relevant
sections. Sample for
EAL
~~~
+* **Added rte_eal_primary_proc_alive() function**
+
+ A new function ``rte_eal_primary_proc_alive()`` has been added
+ to allow the user to detect if a primary process is running.
+ Use cases for this feature include fault detection, and monitoring
+ using secondary processes.
Drivers
~~~
diff --git a/lib/librte_eal/bsdapp/eal/Makefile
b/lib/librte_eal/bsdapp/eal/Makefile
index d7ca60b..1c79734 100644
--- a/lib/librte_eal/bsdapp/eal/Makefile
+++ b/lib/librte_eal/bsdapp/eal/Makefile
@@ -63,6 +63,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_alarm.c
# from common dir
SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_lcore.c
+SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_proc.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_timer.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_memzone.c
SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_log.c
diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index 4f93ab7..15c0d9e 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -146,5 +146,6 @@ DPDK_2.3 {
rte_eal_pci_ioport_write;
rte_eal_pci_map_device;
rte_eal_pci_unmap_device;
+ rte_eal_primary_proc_alive;
} DPDK_2.2;
diff --git a/lib/librte_eal/common/eal_common_proc.c
b/lib/librte_eal/common/eal_common_proc.c
new file mode 100644
index 000..c598891
--- /dev/null
+++ b/lib/librte_eal/common/eal_common_proc.c
@@ -0,0 +1,61 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright 2016 Intel Shannon Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE
