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

[Ferruh Yigit]

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?

> 
> 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;
>  		}
>  	}
>