[dpdk-dev] [PATCH v2 12/13] ethdev: process declarative eth devargs

[Gaetan Rivet <gaetan.rivet@6wind.com>]

Process the eth parameters of a devargs.
For each parameters that have a setter implemented,
the relevant field in rte_eth_dev field is written.

Currently only "name" is implemented.

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
 lib/librte_ethdev/ethdev_private.h |  5 +++
 lib/librte_ethdev/rte_class_eth.c  | 72 ++++++++++++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev.c     |  7 +++
 3 files changed, 84 insertions(+)

diff --git a/lib/librte_ethdev/ethdev_private.h b/lib/librte_ethdev/ethdev_private.h
index 0f5c6d5c4..c0c065165 100644
--- a/lib/librte_ethdev/ethdev_private.h
+++ b/lib/librte_ethdev/ethdev_private.h
@@ -19,6 +19,11 @@ struct rte_eth_dev *
 eth_find_device(const struct rte_eth_dev *_start, rte_eth_cmp_t cmp,
 		const void *data);
 
+/* Generic rte_eth_dev parameters processor. */
+int
+rte_eth_dev_args_parse(struct rte_eth_dev *eth_dev,
+		       struct rte_devargs *da);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_ethdev/rte_class_eth.c b/lib/librte_ethdev/rte_class_eth.c
index 66fd48dc2..7a8b81423 100644
--- a/lib/librte_ethdev/rte_class_eth.c
+++ b/lib/librte_ethdev/rte_class_eth.c
@@ -6,9 +6,11 @@
 
 #include <rte_class.h>
 #include <rte_compat.h>
+#include <rte_devargs.h>
 #include <rte_errno.h>
 #include <rte_kvargs.h>
 #include <rte_log.h>
+#include <rte_string_fns.h>
 
 #include "rte_ethdev.h"
 #include "rte_ethdev_core.h"
@@ -35,6 +37,19 @@ struct eth_dev_match_arg {
 		.kvlist = (k), \
 	})
 
+typedef int (*eth_dev_set_t)(struct rte_eth_dev *edev, const char *value);
+
+static enum eth_params
+ethdev_param_id(const char *key)
+{
+	int i;
+
+	for (i = 0; i < RTE_ETH_PARAMS_MAX; i++)
+		if (strcmp(key, eth_params_keys[i]) == 0)
+			return i;
+	return RTE_ETH_PARAMS_MAX;
+}
+
 static int
 eth_dev_match(const struct rte_eth_dev *edev,
 	      const void *_arg)
@@ -79,6 +94,63 @@ eth_dev_iterate(const void *start,
 	return edev;
 }
 
+static int
+eth_dev_set_name(struct rte_eth_dev *edev,
+		 const char *value)
+{
+	size_t n;
+
+	n = strlcpy(edev->data->name, value,
+		sizeof(edev->data->name));
+
+	/* Name was truncated. */
+	if (n >= sizeof(edev->data->name)) {
+		RTE_LOG(ERR, EAL, "Name %s is too long\n", value);
+		return -1;
+	}
+	return 0;
+}
+
+static int
+ethdev_args_process(const char *key,
+		    const char *value,
+		    void *_edev)
+{
+	static eth_dev_set_t eth_dev_set[] = {
+		[RTE_ETH_PARAMS_NAME] = eth_dev_set_name,
+		[RTE_ETH_PARAMS_MAX] = NULL,
+	};
+	struct rte_eth_dev *edev = _edev;
+	int param;
+
+	param = ethdev_param_id(key);
+	if (eth_dev_set[param])
+		return eth_dev_set[param](edev, value);
+	return 0;
+}
+
+int
+rte_eth_dev_args_parse(struct rte_eth_dev *edev,
+		       struct rte_devargs *devargs)
+{
+	struct rte_kvargs *kvargs = NULL;
+	int ret;
+
+	if (devargs == NULL || devargs->cls_str == NULL)
+		return 0;
+
+	kvargs = rte_kvargs_parse_delim(devargs->cls_str, eth_params_keys, "/");
+	if (kvargs == NULL) {
+		RTE_LOG(ERR, EAL, "cannot parse argument list\n");
+		return -EINVAL;
+	}
+	ret = rte_kvargs_process(kvargs, NULL, ethdev_args_process, edev);
+	rte_kvargs_free(kvargs);
+	if (ret != 0)
+		return -1;
+	return 0;
+}
+
 struct rte_class rte_class_eth = {
 	.dev_iterate = eth_dev_iterate,
 };
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index aa7730ce2..b03fe7f4b 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -41,6 +41,7 @@
 #include "rte_ethdev.h"
 #include "rte_ethdev_driver.h"
 #include "ethdev_profile.h"
+#include "ethdev_private.h"
 
 int rte_eth_dev_logtype;
 
@@ -3504,6 +3505,12 @@ rte_eth_dev_create(struct rte_device *device, const char *name,
 		}
 	}
 
+	retval = rte_eth_dev_args_parse(ethdev, device->devargs);
+	if (retval) {
+		RTE_LOG(ERR, EAL, "ethdev parsing failed");
+		goto probe_failed;
+	}
+
 	retval = ethdev_init(ethdev, init_params);
 	if (retval) {
 		RTE_LOG(ERR, EAL, "ethdev initialisation failed");
-- 
2.18.0