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From: Gaetan Rivet <gaetan.rivet@6wind.com>
To: dev@dpdk.org
Cc: Jan Blunck <jblunck@infradead.org>, Gaetan Rivet <gaetan.rivet@6wind.com>
Date: Mon, 26 Jun 2017 02:21:59 +0200
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Subject: [dpdk-dev] [PATCH v5 01/12] bus: add bus iterator to find a bus
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From: Jan Blunck <jblunck@infradead.org>
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 | 20 ++++++++++++
lib/librte_eal/common/include/rte_bus.h | 43 +++++++++++++++++++++++++
lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 +
4 files changed, 65 insertions(+)
diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
index 2e48a73..ed09ab2 100644
--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
@@ -162,6 +162,7 @@ DPDK_17.02 {
DPDK_17.05 {
global:
+ rte_bus_find;
rte_cpu_is_supported;
rte_log_dump;
rte_log_register;
diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
index 8f9baf8..4619eb2 100644
--- a/lib/librte_eal/common/eal_common_bus.c
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -145,3 +145,23 @@ rte_bus_dump(FILE *f)
}
}
}
+
+struct rte_bus *
+rte_bus_find(rte_bus_cmp_t cmp,
+ const void *data,
+ const struct rte_bus *start)
+{
+ struct rte_bus *bus = NULL;
+ int started = start == NULL;
+
+ TAILQ_FOREACH(bus, &rte_bus_list, next) {
+ if (!started) {
+ if (bus == start)
+ started = 1;
+ continue;
+ }
+ if (cmp(bus, data) == 0)
+ break;
+ }
+ return bus;
+}
diff --git a/lib/librte_eal/common/include/rte_bus.h b/lib/librte_eal/common/include/rte_bus.h
index 5f47b82..ecf839b 100644
--- a/lib/librte_eal/common/include/rte_bus.h
+++ b/lib/librte_eal/common/include/rte_bus.h
@@ -141,6 +141,49 @@ 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 cmp
+ * Comparison function.
+ *
+ * @param data
+ * Data to pass to comparison function.
+ *
+ * @param start
+ * Starting point for the iteration.
+ *
+ * @return
+ * A pointer to a rte_bus structure or NULL in case no bus matches
+ */
+struct rte_bus *rte_bus_find(rte_bus_cmp_t cmp,
+ const void *data,
+ const struct rte_bus *start);
+
+/**
* Helper for Bus registration.
* The constructor has higher priority than PMD constructors.
*/
diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
index 670bab3..6efa517 100644
--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
@@ -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;
--
2.1.4