Re: [dpdk-dev] [PATCH] app/testpmd: support unequal number of RXQ and TXQ

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Hemant Agrawal
> Sent: Wednesday, December 11, 2019 5:30 AM
> To: dev@dpdk.org
> Cc: Jun Yang <jun.yang@nxp.com>
> Subject: [dpdk-dev] [PATCH] app/testpmd: support unequal number of RXQ and TXQ
> 
> From: Jun Yang <jun.yang@nxp.com>
> 
> The existing forwarding mode usages the total number of
> queues as the minimum of rxq and txq.
> It finds the txq as the same index as rxq.
> However in some scenarios, specially for flow control
> the number of rxq and txq can be different.
> This patch maxes the txq and function of rxq for all such
> scenario instead of keeping 1:1 relationship between the two.
> 
> Now packets from all RXQs can be forwarded to TXQs
> 
> Signed-off-by: Jun Yang <jun.yang@nxp.com>
> ---
>  app/test-pmd/config.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
> index d59968278..efa409453 100644
> --- a/app/test-pmd/config.c
> +++ b/app/test-pmd/config.c
> @@ -2130,8 +2130,6 @@ rss_fwd_config_setup(void)
>  	streamid_t  sm_id;
> 
>  	nb_q = nb_rxq;
> -	if (nb_q > nb_txq)
> -		nb_q = nb_txq;
>  	cur_fwd_config.nb_fwd_lcores = (lcoreid_t) nb_fwd_lcores;
>  	cur_fwd_config.nb_fwd_ports = nb_fwd_ports;
>  	cur_fwd_config.nb_fwd_streams =
> @@ -2154,7 +2152,7 @@ rss_fwd_config_setup(void)
>  		fs->rx_port = fwd_ports_ids[rxp];
>  		fs->rx_queue = rxq;
>  		fs->tx_port = fwd_ports_ids[txp];
> -		fs->tx_queue = rxq;
> +		fs->tx_queue = (rxq % nb_txq);

But does it mean that now 2 lcores cah use the same TX queue?
If so, then how it supposed to work?

>  		fs->peer_addr = fs->tx_port;
>  		fs->retry_enabled = retry_enabled;
>  		rxp++;
> --
> 2.17.1