Re: [dpdk-dev] [PATCH] vmxnet3: replenish ring buffers in rx processing

[Shrikrishna Khare <skhare@shri-linux.eng.vmware.com>]

On Fri, 25 Aug 2017, David Harton wrote:

> vmxnet3 rx processing should replenish ring buffers after new buffers
> are available to prevent the interface from getting stuck in a state
> that no new work is processed.
> 
> Signed-off-by: David Harton <dharton@cisco.com>

Thanks for the fix.

Acked-by: Shrikrishna Khare <skhare@vmware.com>

> ---
>  drivers/net/vmxnet3/vmxnet3_rxtx.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
> index d9cf437..9861d35 100644
> --- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
> +++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
> @@ -880,6 +880,23 @@
>  		}
>  	}
>  
> +	if (unlikely(nb_rxd == 0)) {
> +		uint32_t avail;
> +		for (ring_idx = 0; ring_idx < VMXNET3_RX_CMDRING_SIZE; ring_idx++) {
> +			avail = vmxnet3_cmd_ring_desc_avail(&rxq->cmd_ring[ring_idx]);
> +			if (unlikely(avail > 0)) {
> +				/* try to alloc new buf and renew descriptors */
> +				vmxnet3_post_rx_bufs(rxq, ring_idx);
> +			}
> +		}
> +		if (unlikely(rxq->shared->ctrl.updateRxProd)) {
> +			for (ring_idx = 0; ring_idx < VMXNET3_RX_CMDRING_SIZE; ring_idx++) {
> +				VMXNET3_WRITE_BAR0_REG(hw, rxprod_reg[ring_idx] + (rxq->queue_id * VMXNET3_REG_ALIGN),
> +						       rxq->cmd_ring[ring_idx].next2fill);
> +			}
> +		}
> +	}
> +
>  	return nb_rx;
>  }
>  
> -- 
> 1.8.3.1
> 
>