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From: Gaetan Rivet <gaetan.rivet@6wind.com>
To: dev@dpdk.org
Cc: Gaetan Rivet <gaetan.rivet@6wind.com>
Date: Thu, 5 Jul 2018 13:48:15 +0200
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Subject: [dpdk-dev] [PATCH v10 08/27] devargs: add function to parse device
layers
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This function is private to the EAL.
It is used to parse each layers in a device description string,
and store the result in an rte_devargs structure.
Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
lib/librte_eal/common/eal_common_devargs.c | 144 ++++++++++++++++++++
lib/librte_eal/common/eal_private.h | 27 ++++
lib/librte_eal/common/include/rte_devargs.h | 13 +-
3 files changed, 181 insertions(+), 3 deletions(-)
diff --git a/lib/librte_eal/common/eal_common_devargs.c b/lib/librte_eal/common/eal_common_devargs.c
index 0a83beb94..5f89e0b6e 100644
--- a/lib/librte_eal/common/eal_common_devargs.c
+++ b/lib/librte_eal/common/eal_common_devargs.c
@@ -13,9 +13,13 @@
#include <string.h>
#include <stdarg.h>
+#include <rte_bus.h>
+#include <rte_class.h>
#include <rte_compat.h>
#include <rte_dev.h>
#include <rte_devargs.h>
+#include <rte_kvargs.h>
+#include <rte_errno.h>
#include <rte_tailq.h>
#include "eal_private.h"
@@ -56,6 +60,146 @@ rte_eal_parse_devargs_str(const char *devargs_str,
return 0;
}
+static size_t
+devargs_layer_count(const char *s)
+{
+ size_t i = s ? 1 : 0;
+
+ while (s != NULL && s[0] != '\0') {
+ i += s[0] == '/';
+ s++;
+ }
+ return i;
+}
+
+int
+rte_devargs_layers_parse(struct rte_devargs *da,
+ const char *devstr)
+{
+ struct {
+ const char *key;
+ const char *str;
+ struct rte_kvargs *kvlist;
+ } layers[] = {
+ { "bus=", NULL, NULL, },
+ { "class=", NULL, NULL, },
+ { "driver=", NULL, NULL, },
+ };
+ struct rte_kvargs_pair *kv = NULL;
+ struct rte_class *cls = NULL;
+ struct rte_bus *bus = NULL;
+ const char *s = devstr;
+ size_t nblayer;
+ size_t i = 0;
+ int ret = 0;
+
+ /* Split each sub-lists. */
+ nblayer = devargs_layer_count(devstr);
+ if (nblayer > RTE_DIM(layers)) {
+ RTE_LOG(ERR, EAL, "Invalid format: too many layers (%zu)\n",
+ nblayer);
+ ret = -E2BIG;
+ goto get_out;
+ }
+
+ /* If the devargs points the devstr
+ * as source data, then it should not allocate
+ * anything and keep referring only to it.
+ */
+ if (da->data != devstr) {
+ da->data = strdup(devstr);
+ if (da->data == NULL) {
+ RTE_LOG(ERR, EAL, "OOM\n");
+ ret = -ENOMEM;
+ goto get_out;
+ }
+ s = da->data;
+ }
+
+ while (s != NULL) {
+ if (strncmp(layers[i].key, s,
+ strlen(layers[i].key)) &&
+ /* The last layer is free-form.
+ * The "driver" key is not required (but accepted).
+ */
+ i != RTE_DIM(layers) - 1)
+ goto next_layer;
+ layers[i].str = s;
+ layers[i].kvlist = rte_kvargs_parse2(s, NULL, "/");
+ if (layers[i].kvlist == NULL) {
+ RTE_LOG(ERR, EAL, "Could not parse %s\n", s);
+ ret = -EINVAL;
+ goto get_out;
+ }
+ s = strchr(s, '/');
+ if (s != NULL)
+ s++;
+next_layer:
+ if (i >= RTE_DIM(layers)) {
+ RTE_LOG(ERR, EAL, "Unrecognized layer %s\n", s);
+ ret = -EINVAL;
+ goto get_out;
+ }
+ i++;
+ }
+
+ /* Parse each sub-list. */
+ for (i = 0; i < RTE_DIM(layers); i++) {
+ if (layers[i].kvlist == NULL)
+ continue;
+ kv = &layers[i].kvlist->pairs[0];
+ if (strcmp(kv->key, "bus") == 0) {
+ bus = rte_bus_find_by_name(kv->value);
+ if (bus == NULL) {
+ RTE_LOG(ERR, EAL, "Could not find bus \"%s\"\n",
+ kv->value);
+ ret = -EFAULT;
+ goto get_out;
+ }
+ } else if (strcmp(kv->key, "class") == 0) {
+ cls = rte_class_find_by_name(kv->value);
+ if (cls == NULL) {
+ RTE_LOG(ERR, EAL, "Could not find class \"%s\"\n",
+ kv->value);
+ ret = -EFAULT;
+ goto get_out;
+ }
+ } else if (strcmp(kv->key, "driver") == 0) {
+ /* Ignore */
+ continue;
+ }
+ }
+
+ /* Fill devargs fields. */
+ da->busstr = layers[0].str;
+ da->clsstr = layers[1].str;
+ da->drvstr = layers[2].str;
+ da->bus = bus;
+ da->cls = cls;
+
+ /* If we own the data, clean up a bit
+ * the several layers string, to ease
+ * their parsing afterward.
+ */
+ if (da->data != devstr) {
+ char *s = (void *)(intptr_t)(da->data);
+
+ while ((s = strchr(s, '/'))) {
+ *s = '\0';
+ s++;
+ }
+ }
+
+get_out:
+ for (i = 0; i < RTE_DIM(layers); i++) {
+ if (layers[i].kvlist)
+ rte_kvargs_free(layers[i].kvlist);
+ }
+ if (ret != 0)
+ rte_errno = -ret;
+ return ret;
+}
+
static int
bus_name_cmp(const struct rte_bus *bus, const void *name)
{
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index bdadc4d50..c4c9283c8 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -258,4 +258,31 @@ int rte_mp_channel_init(void);
*/
void dev_callback_process(char *device_name, enum rte_dev_event_type event);
+/**
+ * @internal
+ * Parse a device string and store its information in an
+ * rte_devargs structure.
+ *
+ * Note: if the "data" field of da points to devstr,
+ * then no dynamic allocation is performed and the rte_devargs
+ * can be safely discarded.
+ *
+ * Otherwise ``data`` will hold a workable copy of devstr, that will be
+ * used by layers descriptors within rte_devargs. In this case,
+ * any rte_devargs should be cleaned-up before being freed.
+ *
+ * @param da
+ * rte_devargs structure to fill.
+ *
+ * @param devstr
+ * Device string.
+ *
+ * @return
+ * 0 on success.
+ * Negative errno values on error (rte_errno is set).
+ */
+int
+rte_devargs_layers_parse(struct rte_devargs *da,
+ const char *devstr);
+
#endif /* _EAL_PRIVATE_H_ */
diff --git a/lib/librte_eal/common/include/rte_devargs.h b/lib/librte_eal/common/include/rte_devargs.h
index 6c3b6326b..148600258 100644
--- a/lib/librte_eal/common/include/rte_devargs.h
+++ b/lib/librte_eal/common/include/rte_devargs.h
@@ -51,12 +51,19 @@ struct rte_devargs {
enum rte_devtype type;
/** Device policy. */
enum rte_dev_policy policy;
- /** Bus handle for the device. */
- struct rte_bus *bus;
/** Name of the device. */
char name[RTE_DEV_NAME_MAX_LEN];
+ RTE_STD_C11
+ union {
/** Arguments string as given by user or "" for no argument. */
- char *args;
+ char *args;
+ const char *drvstr;
+ };
+ struct rte_bus *bus; /**< bus handle. */
+ struct rte_class *cls; /**< class handle. */
+ const char *busstr; /**< bus-related part of device string. */
+ const char *clsstr; /**< bus-related part of device string. */
+ const char *data; /**< Device string storage. */
};
/**
--
2.18.0