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

[Július Milan]

On Wed, Feb 05, 2020 at 04:00:19PM +0000, Ferruh Yigit wrote:
> 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?
>
Thank you,
Do you mean this message?
"EAL: Error: Invalid memory"
If not, how can I reproduce it?

>> 
>> Fixes: 09c7e63a71 ("net/memif: introduce memory interface PMD")
>> 
>> Signed-off-by: Július Milan <jmilan.dev at 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;
>>  		}
>>  	}
>> 
>