[PATCH 3/4] eventdev: have ethernet Tx adapter appropriately report idle

[Jayatheerthan, Jay]

@Harish, could you review the patch ?

-Jay



> -----Original Message-----
> From: Mattias Rönnblom <mattias.ronnblom at ericsson.com>
> Sent: Monday, October 10, 2022 8:24 PM
> To: Jayatheerthan, Jay <jay.jayatheerthan at intel.com>; Carrillo, Erik G <erik.g.carrillo at intel.com>; Gujjar, Abhinandan S
> <abhinandan.gujjar at intel.com>; Jerin Jacob <jerinj at marvell.com>
> Cc: dev at dpdk.org; Van Haaren, Harry <harry.van.haaren at intel.com>; hofors at lysator.liu.se; mattias.ronnblom
> <mattias.ronnblom at ericsson.com>
> Subject: [PATCH 3/4] eventdev: have ethernet Tx adapter appropriately report idle
> 
> Update the Event Ethernet Tx Adapter's service function to report as
> idle (i.e., return -EAGAIN) in case no events were dequeued from the
> event device and no Ethernet frames were sent out on the wire.
> 
> Signed-off-by: Mattias Rönnblom <mattias.ronnblom at ericsson.com>
> ---
>  lib/eventdev/rte_event_eth_tx_adapter.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/eventdev/rte_event_eth_tx_adapter.c b/lib/eventdev/rte_event_eth_tx_adapter.c
> index 7f7d86f683..c2a848103b 100644
> --- a/lib/eventdev/rte_event_eth_tx_adapter.c
> +++ b/lib/eventdev/rte_event_eth_tx_adapter.c
> @@ -639,6 +639,7 @@ txa_service_func(void *args)
>  	struct txa_service_data *txa = args;
>  	uint8_t dev_id;
>  	uint8_t port;
> +	int ret = -EAGAIN;
>  	uint16_t n;
>  	uint32_t nb_tx, max_nb_tx;
>  	struct rte_event ev[TXA_BATCH_SIZE];
> @@ -648,10 +649,10 @@ txa_service_func(void *args)
>  	port = txa->port_id;
> 
>  	if (txa->nb_queues == 0)
> -		return 0;
> +		return ret;
> 
>  	if (!rte_spinlock_trylock(&txa->tx_lock))
> -		return 0;
> +		return ret;
> 
>  	for (nb_tx = 0; nb_tx < max_nb_tx; nb_tx += n) {
> 
> @@ -659,6 +660,7 @@ txa_service_func(void *args)
>  		if (!n)
>  			break;
>  		txa_service_tx(txa, ev, n);
> +		ret = 0;
>  	}
> 
>  	if ((txa->loop_cnt++ & (TXA_FLUSH_THRESHOLD - 1)) == 0) {
> @@ -692,10 +694,13 @@ txa_service_func(void *args)
>  			}
>  		}
> 
> -		txa->stats.tx_packets += nb_tx;
> +		if (likely(nb_tx > 0)) {
> +			txa->stats.tx_packets += nb_tx;
> +			ret = 0;
> +		}
>  	}
>  	rte_spinlock_unlock(&txa->tx_lock);
> -	return 0;
> +	return ret;
>  }
> 
>  static int
> --
> 2.34.1