[dpdk-dev,v7,01/15] bus: add bus iterator to find a bus
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Commit Message
This helper allows to iterate over all registered buses and find one
matching data used as parameter.
Signed-off-by: Jan Blunck <jblunck@infradead.org>
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_bus.c | 19 +++++++++++
lib/librte_eal/common/include/rte_bus.h | 42 +++++++++++++++++++++++++
lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 +
4 files changed, 63 insertions(+)
@@ -162,6 +162,7 @@ DPDK_17.02 {
DPDK_17.05 {
global:
+ rte_bus_find;
rte_cpu_is_supported;
rte_log_dump;
rte_log_register;
@@ -145,3 +145,22 @@ rte_bus_dump(FILE *f)
}
}
}
+
+struct rte_bus *
+rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
+ const void *data)
+{
+ struct rte_bus *bus = NULL;
+ bool start_found = !start;
+
+ TAILQ_FOREACH(bus, &rte_bus_list, next) {
+ if (!start_found) {
+ if (bus == start)
+ start_found = 1;
+ continue;
+ }
+ if (cmp(bus, data) == 0)
+ break;
+ }
+ return bus;
+}
@@ -141,6 +141,48 @@ int rte_bus_probe(void);
void rte_bus_dump(FILE *f);
/**
+ * Bus comparison function.
+ *
+ * @param bus
+ * Bus under test.
+ *
+ * @param data
+ * Data to compare against.
+ *
+ * @return
+ * 0 if the bus matches the data.
+ * !0 if the bus does not match.
+ * <0 if ordering is possible and the bus is lower than the data.
+ * >0 if ordering is possible and the bus is greater than the data.
+ */
+typedef int (*rte_bus_cmp_t)(const struct rte_bus *bus, const void *data);
+
+/**
+ * Bus iterator to find a particular bus.
+ *
+ * This function compares each registered bus to find one that matches
+ * the data passed as parameter.
+ *
+ * If the comparison function returns zero this function will stop iterating
+ * over any more buses. To continue a search the bus of a previous search can
+ * be passed via the start parameter.
+ *
+ * @param start
+ * Starting point for the iteration.
+ *
+ * @param cmp
+ * Comparison function.
+ *
+ * @param data
+ * Data to pass to comparison function.
+ *
+ * @return
+ * A pointer to a rte_bus structure or NULL in case no bus matches
+ */
+struct rte_bus *rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
+ const void *data);
+
+/**
* Helper for Bus registration.
* The constructor has higher priority than PMD constructors.
*/
@@ -166,6 +166,7 @@ DPDK_17.02 {
DPDK_17.05 {
global:
+ rte_bus_find;
rte_cpu_is_supported;
rte_intr_free_epoll_fd;
rte_log_dump;