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From: Gaetan Rivet <gaetan.rivet@6wind.com>
To: dev@dpdk.org
Cc: Gaetan Rivet <gaetan.rivet@6wind.com>
Date: Tue, 26 Jun 2018 18:56:21 +0200
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Subject: [dpdk-dev] [PATCH v8 18/21] ethdev: add private generic device
iterator
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This iterator can be customized with a comparison function that will
trigger a stopping condition.
It can be leveraged to write several different iterators that have
similar but non-identical purposes.
It is private to librte_ethdev.
Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
lib/librte_ethdev/Makefile | 1 +
lib/librte_ethdev/eth_private.c | 31 +++++++++++++++++++++++++++++++
lib/librte_ethdev/eth_private.h | 26 ++++++++++++++++++++++++++
3 files changed, 58 insertions(+)
create mode 100644 lib/librte_ethdev/eth_private.c
create mode 100644 lib/librte_ethdev/eth_private.h
diff --git a/lib/librte_ethdev/Makefile b/lib/librte_ethdev/Makefile
index c2f2f7d82..2fa133fbc 100644
--- a/lib/librte_ethdev/Makefile
+++ b/lib/librte_ethdev/Makefile
@@ -18,6 +18,7 @@ EXPORT_MAP := rte_ethdev_version.map
LIBABIVER := 9
+SRCS-y += eth_private.c
SRCS-y += rte_ethdev.c
SRCS-y += rte_flow.c
SRCS-y += rte_tm.c
diff --git a/lib/librte_ethdev/eth_private.c b/lib/librte_ethdev/eth_private.c
new file mode 100644
index 000000000..d565568a0
--- /dev/null
+++ b/lib/librte_ethdev/eth_private.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Gaëtan Rivet
+ */
+
+#include "rte_ethdev.h"
+#include "eth_private.h"
+
+struct rte_eth_dev *
+eth_find_device(const struct rte_eth_dev *start, rte_eth_cmp_t cmp,
+ const void *data)
+{
+ struct rte_eth_dev *edev;
+ ptrdiff_t idx;
+
+ /* Avoid Undefined Behaviour */
+ if (start != NULL &&
+ (start < &rte_eth_devices[0] ||
+ start > &rte_eth_devices[RTE_MAX_ETHPORTS]))
+ return NULL;
+ if (start != NULL)
+ idx = start - &rte_eth_devices[0] + 1;
+ else
+ idx = 0;
+ for (; idx < RTE_MAX_ETHPORTS; idx++) {
+ edev = &rte_eth_devices[idx];
+ if (cmp(edev, data) == 0)
+ return edev;
+ }
+ return NULL;
+}
+
diff --git a/lib/librte_ethdev/eth_private.h b/lib/librte_ethdev/eth_private.h
new file mode 100644
index 000000000..0f5c6d5c4
--- /dev/null
+++ b/lib/librte_ethdev/eth_private.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Gaëtan Rivet
+ */
+
+#ifndef _RTE_ETH_PRIVATE_H_
+#define _RTE_ETH_PRIVATE_H_
+
+#include "rte_ethdev.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Generic rte_eth_dev comparison function. */
+typedef int (*rte_eth_cmp_t)(const struct rte_eth_dev *, const void *);
+
+/* Generic rte_eth_dev iterator. */
+struct rte_eth_dev *
+eth_find_device(const struct rte_eth_dev *_start, rte_eth_cmp_t cmp,
+ const void *data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_ETH_PRIVATE_H_ */
--
2.11.0