Parse a device description.
Split this description in their relevant part for each layers.
No dynamic allocation is performed.
Signed-off-by: Gaetan Rivet <gaetan.ri...@6wind.com>
---
lib/Makefile | 1 +
lib/librte_eal/bsdapp/eal/Makefile | 1 +
lib/librte_eal/common/eal_common_dev.c | 148 ++++++++++++++++++++++++++++++++
lib/librte_eal/common/include/rte_dev.h | 24 ++++++
lib/librte_eal/linuxapp/eal/Makefile | 1 +
lib/librte_eal/rte_eal_version.map | 1 +
6 files changed, 176 insertions(+)
diff --git a/lib/Makefile b/lib/Makefile
index fc7a55a37..1b17526f7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -6,6 +6,7 @@ include $(RTE_SDK)/mk/rte.vars.mk
DIRS-y += librte_compat
DIRS-$(CONFIG_RTE_LIBRTE_KVARGS) += librte_kvargs
DIRS-$(CONFIG_RTE_LIBRTE_EAL) += librte_eal
+DEPDIRS-librte_eal := librte_kvargs
DIRS-$(CONFIG_RTE_LIBRTE_PCI) += librte_pci
DEPDIRS-librte_pci := librte_eal
DIRS-$(CONFIG_RTE_LIBRTE_RING) += librte_ring
diff --git a/lib/librte_eal/bsdapp/eal/Makefile
b/lib/librte_eal/bsdapp/eal/Makefile
index c7d5abcd9..c13b08ed1 100644
--- a/lib/librte_eal/bsdapp/eal/Makefile
+++ b/lib/librte_eal/bsdapp/eal/Makefile
@@ -18,6 +18,7 @@ CFLAGS += $(WERROR_FLAGS) -O3
LDLIBS += -lexecinfo
LDLIBS += -lpthread
LDLIBS += -lgcc_s
+LDLIBS += -lrte_kvargs
EXPORT_MAP := ../../rte_eal_version.map
diff --git a/lib/librte_eal/common/eal_common_dev.c
b/lib/librte_eal/common/eal_common_dev.c
index cd071442f..1a671758a 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -10,9 +10,12 @@
#include <rte_compat.h>
#include <rte_bus.h>
+#include <rte_class.h>
#include <rte_dev.h>
#include <rte_devargs.h>
#include <rte_debug.h>
+#include <rte_errno.h>
+#include <rte_kvargs.h>
#include <rte_log.h>
#include "eal_private.h"
@@ -207,3 +210,148 @@ rte_eal_hotplug_remove(const char *busname, const char
*devname)
rte_eal_devargs_remove(busname, devname);
return ret;
}
+
+static size_t
+dev_layer_count(const char *s)
+{
+ size_t i = s ? 1 : 0;
+
+ while (s != NULL && s[0] != '\0') {
+ i += s[0] == '/';
+ s++;
+ }
+ return i;
+}
+
+__rte_experimental
+int
+rte_dev_iterator_init(struct rte_dev_iterator *it,
+ 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;
+
+ /* Having both busstr and clsstr NULL is illegal,
+ * marking this iterator as invalid unless
+ * everything goes well.
+ */
+ it->busstr = NULL;
+ it->clsstr = NULL;
+ /* Split each sub-lists. */
+ nblayer = dev_layer_count(devstr);
+ if (nblayer > RTE_DIM(layers)) {
+ RTE_LOG(ERR, EAL, "Invalid query: too many layers (%zu)\n",
+ nblayer);
+ rte_errno = EINVAL;
+ goto get_out;
+ }
+ while (s != NULL) {
+ char *copy;
+ char *end;
+
+ if (strncmp(layers[i].key, s,
+ strlen(layers[i].key)))
+ goto next_layer;
+ layers[i].str = s;
+ copy = strdup(s);
+ if (copy == NULL) {
+ RTE_LOG(ERR, EAL, "OOM\n");
+ rte_errno = ENOMEM;
+ goto get_out;
+ }
+ end = strchr(copy, '/');
+ end = end ? end : strchr(copy, '\0');
+ end[0] = '\0';
+ layers[i].kvlist = rte_kvargs_parse(copy, NULL);
+ free(copy);
+ if (layers[i].kvlist == NULL) {
+ RTE_LOG(ERR, EAL, "Could not parse %s\n", s);
+ rte_errno = 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);
+ rte_errno = 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);
+ rte_errno = 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);
+ rte_errno = EFAULT;
+ goto get_out;
+ }
+ } else if (strcmp(kv->key, "driver") == 0) {
+ /* Ignore */
+ continue;
+ }
+ }
+ /* The string should have at least
+ * one layer specified.
+ */
+ if (bus == NULL && cls == NULL) {
+ RTE_LOG(ERR, EAL,
+ "Either bus or class must be specified.\n");
+ rte_errno = EINVAL;
+ goto get_out;
+ }
+ if (bus != NULL && bus->dev_iterate == NULL) {
+ RTE_LOG(ERR, EAL, "Bus %s not supported\n", bus->name);
+ rte_errno = ENOTSUP;
+ goto get_out;
+ }
+ if (cls != NULL && cls->dev_iterate == NULL) {
+ RTE_LOG(ERR, EAL, "Class %s not supported\n", cls->name);
+ rte_errno = ENOTSUP;
+ goto get_out;
+ }
+ /* Fill iterator fields. */
+ if (bus != NULL)
+ it->busstr = layers[0].str;
+ if (cls != NULL)
+ it->clsstr = layers[1].str;
+ it->devstr = devstr;
+ it->bus = bus;
+ it->cls = cls;
+ it->device = NULL;
+ it->class_device = NULL;
+get_out:
+ for (i = 0; i < RTE_DIM(layers); i++) {
+ if (layers[i].kvlist)
+ rte_kvargs_free(layers[i].kvlist);
+ }
+ return -rte_errno;
+}
diff --git a/lib/librte_eal/common/include/rte_dev.h
b/lib/librte_eal/common/include/rte_dev.h
index 937ff6079..f84128e5c 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -310,6 +310,30 @@ typedef void *(*rte_dev_iterate_t)(const void *start,
const char *devstr,
const struct rte_dev_iterator *it);
+/**
+ * Initializes a device iterator.
+ *
+ * This iterator allows accessing a list of devices matching a criteria.
+ * The device matching is made among all buses and classes currently
registered,
+ * filtered by the device description given as parameter.
+ *
+ * This function will not allocate any memory. It is safe to stop the
+ * iteration at any moment and let the iterator go out of context.
+ *
+ * @param it
+ * Device iterator handle.
+ *
+ * @param str
+ * Device description string.
+ *
+ * @return
+ * 0 on successful initialization.
+ * <0 on error.
+ */
+__rte_experimental
+int
+rte_dev_iterator_init(struct rte_dev_iterator *it, const char *str);
+
#ifdef __cplusplus
}
#endif
diff --git a/lib/librte_eal/linuxapp/eal/Makefile
b/lib/librte_eal/linuxapp/eal/Makefile
index 06ab30cad..6fb67bf7f 100644
--- a/lib/librte_eal/linuxapp/eal/Makefile
+++ b/lib/librte_eal/linuxapp/eal/Makefile
@@ -27,6 +27,7 @@ LDLIBS += -lrt
ifeq ($(CONFIG_RTE_EAL_NUMA_AWARE_HUGEPAGES),y)
LDLIBS += -lnuma
endif
+LDLIBS += -lrte_kvargs
# specific to linuxapp exec-env
SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) := eal.c
diff --git a/lib/librte_eal/rte_eal_version.map
b/lib/librte_eal/rte_eal_version.map
index afe6ce1b9..cad24376f 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -220,6 +220,7 @@ EXPERIMENTAL {
rte_eal_devargs_remove;
rte_class_register;
rte_class_unregister;
+ rte_dev_iterator_init;
rte_eal_hotplug_add;
rte_eal_hotplug_remove;
rte_eal_mbuf_user_pool_ops;
--
2.11.0
