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

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 <redacted>
---
 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

On 2/5/2020 3:41 PM, Július Milan wrote:

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"

Overall looks good idea but this cause a crash in testpmd on exit, can you
please check?

On Wed, Feb 05, 2020 at 04:00:19PM +0000, Ferruh Yigit wrote:

On 2/5/2020 3:41 PM, Július Milan wrote:

quoted

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"

Overall looks good idea but this cause a crash in testpmd on exit, can you
please check?

Thank you,
Do you mean this message?
"EAL: Error: Invalid memory"
If not, how can I reproduce it?

quoted

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

Signed-off-by: Július Milan <redacted>
---
 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;
 		}
 	}

On 2/5/2020 4:44 PM, Július Milan wrote:

On Wed, Feb 05, 2020 at 04:00:19PM +0000, Ferruh Yigit wrote:

quoted

On 2/5/2020 3:41 PM, Július Milan wrote:

quoted

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"

Overall looks good idea but this cause a crash in testpmd on exit, can you
please check?

Thank you,
Do you mean this message?
"EAL: Error: Invalid memory"

No.

If not, how can I reproduce it?

Start testpmd [1], quit it [2], and will get a crash [3]. Full log in [4].



[1]
./build/app/testpmd --no-pci --vdev=net_memif0,role=master,id=0
--vdev=net_memif1,role=slave,id=0 --vdev=net_memif1,role=slave,id=1 --log-level
"pmd*:debug" -- --no-mlockall -i

[2]
testpmd> quit

[3]
Segmentation fault (core dumped)


[4]
$ ./build/app/testpmd --no-pci --vdev=net_memif0,role=master,id=0
--vdev=net_memif1,role=slave,id=0 --vdev=net_memif1,role=slave,id=1 --log-level
"pmd*:debug" -- --no-mlockall -i
EAL: Detected 96 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: VFIO support initialized
rte_pmd_memif_probe(): Initialize MEMIF: net_memif0.
memif_socket_create(): Memif listener socket /run/memif.sock created.
rte_pmd_memif_probe(): Initialize MEMIF: net_memif1.
Interactive-mode selected
Warning: NUMA should be configured manually by using --port-numa-config and
--ring-numa-config parameters along with --numa.
testpmd: create a new mbuf pool <mbuf_pool_socket_0>: n=779456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
testpmd: create a new mbuf pool <mbuf_pool_socket_1>: n=779456, size=2176, socket=1
testpmd: preferred mempool ops selected: ring_mp_mc
Configuring Port 0 (socket 0)
Port 0: 3A:45:AA:E6:9A:93
Configuring Port 1 (socket 0)
memif_listener_handler(): /run/memif.sock: Connection request accepted.
memif_msg_send_from_queue(): Sent msg type 2.
memif_connect_slave(): Memif socket: /run/memif.sock connected.
memif_msg_receive(): Received msg type: 2.
memif_msg_receive_hello(): Connecting to DPDK 20.02.0-rc1.
memif_msg_send_from_queue(): Sent msg type 3.
memif_msg_receive(): Received msg type: 3.
memif_msg_send_from_queue(): Sent msg type 1.
memif_msg_receive(): Received msg type: 1.
memif_msg_send_from_queue(): Sent msg type 4.
memif_msg_receive(): Received msg type: 4.
memif_msg_send_from_queue(): Sent msg type 1.
memif_msg_receive(): Received msg type: 1.
memif_msg_send_from_queue(): Sent msg type 5.
memif_msg_receive(): Received msg type: 5.
memif_msg_send_from_queue(): Sent msg type 1.
memif_msg_receive(): Received msg type: 1.
memif_msg_send_from_queue(): Sent msg type 5.
memif_msg_receive(): Received msg type: 5.
memif_msg_send_from_queue(): Sent msg type 1.
memif_msg_receive(): Received msg type: 1.
memif_msg_send_from_queue(): Sent msg type 6.
memif_msg_receive(): Received msg type: 6.
memif_connect(): Connected.
memif_msg_receive_connect(): Remote interface net_memif1 connected.
memif_msg_send_from_queue(): Sent msg type 7.
memif_msg_receive(): Received msg type: 7.
memif_connect(): Connected.
memif_msg_receive_connected(): Remote interface net_memif0 connected.
Port 1: BA:50:9A:75:5E:9F
Checking link statuses...
Done
Error during enabling promiscuous mode for port 0: Operation not supported - ignore
Error during enabling promiscuous mode for port 1: Operation not supported - ignore
testpmd> quit

Stopping port 0...
Stopping ports...
Done

Stopping port 1...
Stopping ports...
Done

Shutting down port 0...
Closing ports...
memif_msg_receive(): Received msg type: 8.
memif_msg_receive_disconnect(): Disconnect received: Device closed
memif_disconnect(): Disconnected.
memif_msg_receive(): Invalid message size.
memif_msg_send_from_queue(): sendmsg fail: Broken pipe.
memif_disconnect(): Unexpected message(s) in message queue.
memif_disconnect(): Disconnected.
memif_msg_send_from_queue(): Sent msg type 0.
Segmentation fault (core dumped)

quoted

quoted

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

Signed-off-by: Július Milan <redacted>
---
 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;
 		}
 	}