[dpdk-dev] [PATCH v11 24/25] ethdev: process declarative eth devargs

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

Process the class-specific arguments in a devargs.
This processing takes the form of setting the proper eth_dev fields when
relevant.

Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
 lib/librte_ethdev/eth_private.h   |  5 +++
 lib/librte_ethdev/rte_class_eth.c | 62 +++++++++++++++++++++++++++++++
 lib/librte_ethdev/rte_ethdev.c    |  7 ++++
 3 files changed, 74 insertions(+)

diff --git a/lib/librte_ethdev/eth_private.h b/lib/librte_ethdev/eth_private.h
index 0f5c6d5c4..c0c065165 100644
--- a/lib/librte_ethdev/eth_private.h
+++ b/lib/librte_ethdev/eth_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 d8d8e8845..18fdef605 100644
--- a/lib/librte_ethdev/rte_class_eth.c
+++ b/lib/librte_ethdev/rte_class_eth.c
@@ -6,6 +6,7 @@
 
 #include <rte_class.h>
 #include <rte_compat.h>
+#include <rte_devargs.h>
 #include <rte_errno.h>
 #include <rte_kvargs.h>
 #include <rte_log.h>
@@ -35,6 +36,19 @@ 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 +93,54 @@ eth_dev_iterate(const void *start,
 	return edev;
 }
 
+static int
+eth_dev_set_name(struct rte_eth_dev *edev,
+		 const char *value)
+{
+	snprintf(edev->data->name,
+		 sizeof(edev->data->name),
+		 "%s", value);
+	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;
+
+	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;
+	}
+	if (rte_kvargs_process(kvargs, NULL, ethdev_args_process, edev))
+		return -1;
+	rte_kvargs_free(kvargs);
+	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 98e089e58..cee4f5bee 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 "eth_private.h"
 
 int rte_eth_dev_logtype;
 
@@ -3486,6 +3487,12 @@ 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