[dpdk-dev] [PATCH 3/5] ethdev: allow iterating with only class filter

[Thomas Monjalon <thomas@monjalon.net>]

If no rte_device is given in the iterator,
eth_dev_match() is looking at all ports without any restriction,
except the ethdev kvargs filter.

It allows to iterate with a devargs filter referencing only
some ethdev parameters. The format (from the new devargs syntax) is:
	class=eth,paramY=Y

Fixes: e815a7f69371 ("ethdev: register as a class")

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
 lib/librte_ethdev/rte_class_eth.c |  2 +-
 lib/librte_ethdev/rte_ethdev.c    | 13 +++++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/lib/librte_ethdev/rte_class_eth.c b/lib/librte_ethdev/rte_class_eth.c
index 84b646291..f0af51c36 100644
--- a/lib/librte_ethdev/rte_class_eth.c
+++ b/lib/librte_ethdev/rte_class_eth.c
@@ -42,7 +42,7 @@ eth_dev_match(const struct rte_eth_dev *edev,
 
 	if (edev->state == RTE_ETH_DEV_UNUSED)
 		return -1;
-	if (edev->device != arg->device)
+	if (arg->device != NULL && arg->device != edev->device)
 		return -1;
 	if (kvlist == NULL)
 		/* Empty string matches everything. */
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 83ab28c23..a43e0ab3a 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -199,10 +199,18 @@ rte_eth_iterator_init(struct rte_dev_iterator *iter, const char *devargs_str)
 	 * The devargs string may use various syntaxes:
 	 *   - 0000:08:00.0,representor=[1-3]
 	 *   - pci:0000:06:00.0,representor=[0,5]
+	 *   - class=eth,mac=00:11:22:33:44:55
 	 * A new syntax is in development (not yet supported):
 	 *   - bus=X,paramX=x/class=Y,paramY=y/driver=Z,paramZ=z
 	 */
 
+	/* Handle a case from future syntax, without any bus-level argument. */
+	if (strncmp(devargs_str, iter_anybus_str,
+			strlen(iter_anybus_str)) == 0) {
+		iter->cls_str = devargs_str + strlen(iter_anybus_str);
+		goto end;
+	}
+
 	/* Split bus, device and parameters. */
 	ret = rte_devargs_parse(&devargs, devargs_str);
 	if (ret != 0)
@@ -239,6 +247,7 @@ rte_eth_iterator_init(struct rte_dev_iterator *iter, const char *devargs_str)
 	}
 	iter->bus_str = bus_str;
 
+end:
 	iter->cls = rte_class_find_by_name("eth");
 	return 0;
 }
@@ -250,7 +259,7 @@ rte_eth_iterator_next(struct rte_dev_iterator *iter)
 		return RTE_MAX_ETHPORTS;
 
 	do { /* loop for matching rte_device */
-		if (iter->class_device == NULL) {
+		if (iter->bus != NULL && iter->class_device == NULL) {
 			iter->device = iter->bus->dev_iterate(
 					iter->device, iter->bus_str, iter);
 			if (iter->device == NULL)
@@ -260,7 +269,7 @@ rte_eth_iterator_next(struct rte_dev_iterator *iter)
 				iter->class_device, iter->cls_str, iter);
 		if (iter->class_device != NULL)
 			return eth_dev_to_id(iter->class_device);
-	} while (iter->class_device == NULL);
+	} while (iter->bus != NULL && iter->class_device == NULL);
 
 	/* No more ethdev port to iterate. */
 	free(RTE_CAST_FIELD(iter, bus_str, char *)); /* workaround const */
-- 
2.19.0