[dpdk-dev] [PATCH v1] eal: update all buses default scan mode

[Xueming Li <xuemingl@nvidia.com>]

When parsing EAL allowed or blocked device arguments, only device bus
being parsed got default scan mode updated. If the devargs was vdev, PCI
bus default scan mode not touched, all PCI bus devices will got probed
even none appear in allowed list.

This patch update all buses default scan mode when parsing first
devargs.

Signed-off-by: Xueming Li <xuemingl@nvidia.com>
---
 lib/librte_eal/common/eal_common_bus.c     | 15 +++++++++++++++
 lib/librte_eal/common/eal_common_devargs.c | 13 +++++--------
 lib/librte_eal/common/eal_private.h        |  8 ++++++++
 3 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index baa5b532af..d5818a456e 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -277,3 +277,18 @@ rte_bus_sigbus_handler(const void *failure_addr)
 
 	return ret;
 }
+
+void
+rte_bus_scan_mode_update(enum rte_bus_scan_mode mode)
+{
+	struct rte_bus *bus;
+	static bool mode_set;
+
+	if (mode_set)
+		return;
+	TAILQ_FOREACH(bus, &rte_bus_list, next) {
+		if (bus->conf.scan_mode == RTE_BUS_SCAN_UNDEFINED)
+			bus->conf.scan_mode = mode;
+	}
+	mode_set = true;
+}
diff --git a/lib/librte_eal/common/eal_common_devargs.c b/lib/librte_eal/common/eal_common_devargs.c
index fcf3d9a3cc..3aedcb5c09 100644
--- a/lib/librte_eal/common/eal_common_devargs.c
+++ b/lib/librte_eal/common/eal_common_devargs.c
@@ -301,7 +301,6 @@ int
 rte_devargs_add(enum rte_devtype devtype, const char *devargs_str)
 {
 	struct rte_devargs *devargs = NULL;
-	struct rte_bus *bus = NULL;
 	const char *dev = devargs_str;
 
 	/* use calloc instead of rte_zmalloc as it's called early at init */
@@ -312,15 +311,13 @@ rte_devargs_add(enum rte_devtype devtype, const char *devargs_str)
 	if (rte_devargs_parse(devargs, dev))
 		goto fail;
 	devargs->type = devtype;
-	bus = devargs->bus;
 	if (devargs->type == RTE_DEVTYPE_BLOCKED)
 		devargs->policy = RTE_DEV_BLOCKED;
-	if (bus->conf.scan_mode == RTE_BUS_SCAN_UNDEFINED) {
-		if (devargs->policy == RTE_DEV_ALLOWED)
-			bus->conf.scan_mode = RTE_BUS_SCAN_ALLOWLIST;
-		else if (devargs->policy == RTE_DEV_BLOCKED)
-			bus->conf.scan_mode = RTE_BUS_SCAN_BLOCKLIST;
-	}
+
+	if (devargs->policy == RTE_DEV_ALLOWED)
+		rte_bus_scan_mode_update(RTE_BUS_SCAN_ALLOWLIST);
+	else if (devargs->policy == RTE_DEV_BLOCKED)
+		rte_bus_scan_mode_update(RTE_BUS_SCAN_BLOCKLIST);
 	TAILQ_INSERT_TAIL(&devargs_list, devargs, next);
 	return 0;
 
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index b8a0d20021..ddd6769849 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -452,6 +452,14 @@ int rte_eal_memory_detach(void);
  */
 struct rte_bus *rte_bus_find_by_device_name(const char *str);
 
+/**
+ * Update all buses scan mode if not set, used by EAL parameter parsing.
+ *
+ * @param mode
+ *   Bus scan mode to be set.
+ */
+void rte_bus_scan_mode_update(enum rte_bus_scan_mode mode);
+
 /**
  * Create the unix channel for primary/secondary communication.
  *
-- 
2.25.1