[dpdk-dev] [PATCH] net/memif: enable loopback

["Július Milan" <jmilan.dev@gmail.com>]

With this patch it is possible to connect 2 DPDK memifs into loopback,
i.e. when they have the same id and different roles, as for example:
 "--vdev=net_memif0,role=master,id=0"
 "--vdev=net_memif1,role=slave,id=0"

Fixes: 09c7e63a71 ("net/memif: introduce memory interface PMD")

Signed-off-by: Július Milan <jmilan.dev@gmail.com>
---
 drivers/net/memif/memif_socket.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/net/memif/memif_socket.c b/drivers/net/memif/memif_socket.c
index ad5e30b96..552d3bec1 100644
--- a/drivers/net/memif/memif_socket.c
+++ b/drivers/net/memif/memif_socket.c
@@ -203,7 +203,7 @@ memif_msg_receive_init(struct memif_control_channel *cc, memif_msg_t *msg)
 		dev = elt->dev;
 		pmd = dev->data->dev_private;
 		if (((pmd->flags & ETH_MEMIF_FLAG_DISABLED) == 0) &&
-		    pmd->id == i->id) {
+		    (pmd->id == i->id) && (pmd->role == MEMIF_ROLE_MASTER)) {
 			/* assign control channel to device */
 			cc->dev = dev;
 			pmd->cc = cc;
@@ -965,20 +965,11 @@ memif_socket_init(struct rte_eth_dev *dev, const char *socket_filename)
 	}
 	pmd->socket_filename = socket->filename;
 
-	if (socket->listener != 0 && pmd->role == MEMIF_ROLE_SLAVE) {
-		MIF_LOG(ERR, "Socket is a listener.");
-		return -1;
-	} else if ((socket->listener == 0) && (pmd->role == MEMIF_ROLE_MASTER)) {
-		MIF_LOG(ERR, "Socket is not a listener.");
-		return -1;
-	}
-
 	TAILQ_FOREACH(elt, &socket->dev_queue, next) {
 		tmp_pmd = elt->dev->data->dev_private;
-		if (tmp_pmd->id == pmd->id) {
-			MIF_LOG(ERR, "Memif device with id %d already "
-				"exists on socket %s",
-				pmd->id, socket->filename);
+		if (tmp_pmd->id == pmd->id && tmp_pmd->role == pmd->role) {
+			MIF_LOG(ERR, "Two interfaces with the same id (%d) can "
+				"not have the same role.", pmd->id);
 			return -1;
 		}
 	}
-- 
2.17.1