[dpdk-dev] [PATCH v5 04/12] eal: integrate bus scan and probe with EAL

Shreyansh Jain shreyansh.jain at nxp.com
Mon Dec 26 14:23:57 CET 2016


Still a dummy implementation as no real bus driver exists. This adds calls
from EAL to bus specific scan, match functions.
Once driver->probe is in place, and a bus handler has been installed,
the code would become effective.

Signed-off-by: Shreyansh Jain <shreyansh.jain at nxp.com>
---
 lib/librte_eal/bsdapp/eal/eal.c         |  7 +++++++
 lib/librte_eal/common/eal_common_bus.c  | 30 ++++++++++++++++++++++++++++++
 lib/librte_eal/common/include/rte_bus.h | 19 +++++++++++++++++++
 lib/librte_eal/linuxapp/eal/eal.c       |  7 +++++++
 4 files changed, 63 insertions(+)

diff --git a/lib/librte_eal/bsdapp/eal/eal.c b/lib/librte_eal/bsdapp/eal/eal.c
index 2206277..2c223de 100644
--- a/lib/librte_eal/bsdapp/eal/eal.c
+++ b/lib/librte_eal/bsdapp/eal/eal.c
@@ -64,6 +64,7 @@
 #include <rte_string_fns.h>
 #include <rte_cpuflags.h>
 #include <rte_interrupts.h>
+#include <rte_bus.h>
 #include <rte_pci.h>
 #include <rte_dev.h>
 #include <rte_devargs.h>
@@ -577,6 +578,9 @@ rte_eal_init(int argc, char **argv)
 		rte_config.master_lcore, thread_id, cpuset,
 		ret == 0 ? "" : "...");
 
+	if (rte_eal_bus_scan())
+		rte_panic("Cannot scan the buses for devices\n");
+
 	RTE_LCORE_FOREACH_SLAVE(i) {
 
 		/*
@@ -613,6 +617,9 @@ rte_eal_init(int argc, char **argv)
 	if (rte_eal_pci_probe())
 		rte_panic("Cannot probe PCI\n");
 
+	if (rte_eal_bus_probe())
+		rte_panic("Cannot probe devices\n");
+
 	if (rte_eal_dev_init() < 0)
 		rte_panic("Cannot init pmd devices\n");
 
diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 5a5ae75..b7ccbd8 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -172,6 +172,36 @@ rte_eal_bus_unregister(struct rte_bus *bus)
 	RTE_LOG(INFO, EAL, "Unregistered [%s] bus.\n", bus->name);
 }
 
+/* Scan all the buses for registering devices */
+int
+rte_eal_bus_scan(void)
+{
+	int ret;
+	struct rte_bus *bus = NULL;
+
+	TAILQ_FOREACH(bus, &rte_bus_list, next) {
+		ret = bus->scan(bus);
+		if (ret) {
+			RTE_LOG(ERR, EAL, "Scan for (%s) bus failed.\n",
+				bus->name);
+			/* TODO: Should error on a particular bus block scan
+			 * for all others?
+			 */
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+/* Match driver<->device and call driver->probe() */
+int
+rte_eal_bus_probe(void)
+{
+	/* Until driver->probe is available, this is dummy implementation */
+	return 0;
+}
+
 /* dump one bus info */
 static int
 bus_dump_one(FILE *f, struct rte_bus *bus)
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index da76db3..3bd3ab5 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -212,6 +212,25 @@ void rte_eal_bus_unregister(struct rte_bus *bus);
  */
 struct rte_bus *rte_eal_bus_get(const char *bus_name);
 
+/** @internal
+ * Scan all the buses attached to the framework.
+ *
+ * @param void
+ * @return void
+ */
+int rte_eal_bus_scan(void);
+
+/** @internal
+ * For each device on the bus, perform a driver 'match' and call the
+ * driver's probe for device initialization.
+ *
+ * @param void
+ * @return
+ *	0 for successful match/probe
+ *	!0 otherwise
+ */
+int rte_eal_bus_probe(void);
+
 /**
  * Dump information of all the buses registered with EAL.
  *
diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index 16dd5b9..1a17891 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -69,6 +69,7 @@
 #include <rte_string_fns.h>
 #include <rte_cpuflags.h>
 #include <rte_interrupts.h>
+#include <rte_bus.h>
 #include <rte_pci.h>
 #include <rte_dev.h>
 #include <rte_devargs.h>
@@ -844,6 +845,9 @@ rte_eal_init(int argc, char **argv)
 	if (rte_eal_intr_init() < 0)
 		rte_panic("Cannot init interrupt-handling thread\n");
 
+	if (rte_eal_bus_scan())
+		rte_panic("Cannot scan the buses for devices\n");
+
 	RTE_LCORE_FOREACH_SLAVE(i) {
 
 		/*
@@ -884,6 +888,9 @@ rte_eal_init(int argc, char **argv)
 	if (rte_eal_pci_probe())
 		rte_panic("Cannot probe PCI\n");
 
+	if (rte_eal_bus_probe())
+		rte_panic("Cannot probe devices\n");
+
 	if (rte_eal_dev_init() < 0)
 		rte_panic("Cannot init pmd devices\n");
 
-- 
2.7.4



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