[PATCH] net/gve: Refill all descriptors that were consumed

[Guo, Junfeng]

Acked-by: Junfeng Guo <junfeng.guo at intel.com>

Regards,
Junfeng

> -----Original Message-----
> From: Rushil Gupta <rushilg at google.com>
> Sent: Friday, September 15, 2023 04:52
> To: Zhang, Qi Z <qi.z.zhang at intel.com>; ferruh.yigit at amd.com
> Cc: Guo, Junfeng <junfeng.guo at intel.com>; dev at dpdk.org; Rushil Gupta
> <rushilg at google.com>; Joshua Washington <joshwash at google.com>
> Subject: [PATCH] net/gve: Refill all descriptors that were consumed
> 
> Refill all consumed descriptors instead of refilling a set amount of
> descriptors everytime. Also, lower the rx-free-thresh to refill more
> aggressively. This yields in fewer packet drops for DQO queue format.
> 
> Signed-off-by: Rushil Gupta <rushilg at google.com>
> Reviewed-by: Joshua Washington <joshwash at google.com>
> ---
>  drivers/net/gve/gve_ethdev.h | 2 +-
>  drivers/net/gve/gve_rx_dqo.c | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/gve/gve_ethdev.h b/drivers/net/gve/gve_ethdev.h
> index c9bcfa553c..fe7095ed76 100644
> --- a/drivers/net/gve/gve_ethdev.h
> +++ b/drivers/net/gve/gve_ethdev.h
> @@ -27,7 +27,7 @@
>  #define PCI_MSIX_FLAGS		2	/* Message Control */
>  #define PCI_MSIX_FLAGS_QSIZE	0x07FF	/* Table size */
> 
> -#define GVE_DEFAULT_RX_FREE_THRESH  512
> +#define GVE_DEFAULT_RX_FREE_THRESH   64
>  #define GVE_DEFAULT_TX_FREE_THRESH   32
>  #define GVE_DEFAULT_TX_RS_THRESH     32
>  #define GVE_TX_MAX_FREE_SZ          512
> diff --git a/drivers/net/gve/gve_rx_dqo.c b/drivers/net/gve/gve_rx_dqo.c
> index 236aefd2a8..7e7ddac48e 100644
> --- a/drivers/net/gve/gve_rx_dqo.c
> +++ b/drivers/net/gve/gve_rx_dqo.c
> @@ -12,8 +12,8 @@ gve_rx_refill_dqo(struct gve_rx_queue *rxq)
>  {
>  	volatile struct gve_rx_desc_dqo *rx_buf_ring;
>  	volatile struct gve_rx_desc_dqo *rx_buf_desc;
> -	struct rte_mbuf *nmb[rxq->free_thresh];
> -	uint16_t nb_refill = rxq->free_thresh;
> +	struct rte_mbuf *nmb[rxq->nb_rx_hold];
> +	uint16_t nb_refill = rxq->nb_rx_hold;
>  	uint16_t nb_desc = rxq->nb_rx_desc;
>  	uint16_t next_avail = rxq->bufq_tail;
>  	struct rte_eth_dev *dev;
> --
> 2.42.0.459.ge4e396fd5e-goog