diff mbox

[dpdk-dev,v4,3/8] devargs: introduce insert function

Message ID 94b54d46d4e1e0472ca6dd1287fc1fada703f1f0.1499964391.git.gaetan.rivet@6wind.com (mailing list archive)
State Accepted, archived
Headers

Checks

Context Check Description
ci/checkpatch warning coding style issues
ci/Intel-compilation success Compilation OK

Commit Message

Gaëtan Rivet July 15, 2017, 5:56 p.m. UTC 
  Some buses will operate either in whitelist or blacklist mode.
This mode is currently passed down by the rte_eal_devargs_add function
with the devtype argument.

When inserting devices using the hotplug API, the implicit assumption is
that this device is being whitelisted, meaning that it is explicitly
requested by the application to be used. This can conflict with the
initial bus configuration.

While the rte_eal_devargs_add API is being deprecated soon, it cannot
be modified at the moment to accomodate this situation.
As such, this new experimental API offers a bare interface for inserting
rte_devargs without directly manipulating the global rte_devargs list.

This new function expects a fully-formed rte_devargs, previously parsed
and allocated.

It does not check whether the new rte_devargs is compatible with current
bus configuration, but will replace any eventual existing one for the same
device, allowing the hotplug operation to proceed. i.e. a previously
blacklisted device can be redefined as being whitelisted.

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
 lib/librte_eal/bsdapp/eal/rte_eal_version.map   |  1 +
 lib/librte_eal/common/eal_common_devargs.c      | 12 ++++++++++++
 lib/librte_eal/common/include/rte_devargs.h     | 13 +++++++++++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map |  1 +
 4 files changed, 27 insertions(+)
diff mbox

Patch

diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index 40cd523..8b24309 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -206,6 +206,7 @@  DPDK_17.08 {
 EXPERIMENTAL {
 	global:
 
+	rte_eal_devargs_insert;
 	rte_eal_devargs_parse;
 	rte_eal_devargs_remove;
 	rte_eal_hotplug_add;
diff --git a/lib/librte_eal/common/eal_common_devargs.c b/lib/librte_eal/common/eal_common_devargs.c
index bcdee13..ff6c2a8 100644
--- a/lib/librte_eal/common/eal_common_devargs.c
+++ b/lib/librte_eal/common/eal_common_devargs.c
@@ -138,6 +138,18 @@  rte_eal_devargs_parse(const char *dev, struct rte_devargs *da)
 	return 0;
 }
 
+int
+rte_eal_devargs_insert(struct rte_devargs *da)
+{
+	int ret;
+
+	ret = rte_eal_devargs_remove(da->bus->name, da->name);
+	if (ret < 0)
+		return ret;
+	TAILQ_INSERT_TAIL(&devargs_list, da, next);
+	return 0;
+}
+
 /* store a whitelist parameter for later parsing */
 int
 rte_eal_devargs_add(enum rte_devtype devtype, const char *devargs_str)
diff --git a/lib/librte_eal/common/include/rte_devargs.h b/lib/librte_eal/common/include/rte_devargs.h
index 36453b6..7b63fa3 100644
--- a/lib/librte_eal/common/include/rte_devargs.h
+++ b/lib/librte_eal/common/include/rte_devargs.h
@@ -139,6 +139,19 @@  rte_eal_devargs_parse(const char *dev,
 		      struct rte_devargs *da);
 
 /**
+ * Insert an rte_devargs in the global list.
+ *
+ * @param da
+ *  The devargs structure to insert.
+ *
+ * @return
+ *   - 0 on success
+ *   - Negative on error.
+ */
+int
+rte_eal_devargs_insert(struct rte_devargs *da);
+
+/**
  * Add a device to the user device list
  *
  * For PCI devices, the format of arguments string is "PCI_ADDR" or
diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index a8ee349..81f6af3 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -211,6 +211,7 @@  DPDK_17.08 {
 EXPERIMENTAL {
 	global:
 
+	rte_eal_devargs_insert;
 	rte_eal_devargs_parse;
 	rte_eal_devargs_remove;
 	rte_eal_hotplug_add;