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

[Rushil Gupta]

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