[PATCH] net/nfp: modify Rx buffer size setting logic

[Chaoyong He <chaoyong.he@corigine.com>]

From: Long Wu <long.wu@corigine.com>

In the previous logic, NFP driver would modify hardware Rx buffer size
every time rxq was set. This will cause the setting of one Rx queue
to affect all Rx queues, resulting in the card being unable to receive
packets properly in some cases.

Modify this logic so that after the first initialization, only when
the Rx queue buffer size is greater than the current hardware set size
will it be modified.

Signed-off-by: Long Wu <long.wu@corigine.com>
Reviewed-by: Chaoyong He <chaoyong.he@corigine.com>
---
 drivers/net/nfp/nfp_net_common.h |  1 +
 drivers/net/nfp/nfp_rxtx.c       | 16 +++++++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/nfp/nfp_net_common.h b/drivers/net/nfp/nfp_net_common.h
index d4fe8338b9..6291a794b2 100644
--- a/drivers/net/nfp/nfp_net_common.h
+++ b/drivers/net/nfp/nfp_net_common.h
@@ -239,6 +239,7 @@ struct nfp_net_hw {
 	uint32_t max_tx_queues;
 	uint32_t max_rx_queues;
 	uint16_t flbufsz;
+	bool flbufsz_set_flag;
 	uint16_t device_id;
 	uint16_t vendor_id;
 	uint16_t subsystem_device_id;
diff --git a/drivers/net/nfp/nfp_rxtx.c b/drivers/net/nfp/nfp_rxtx.c
index d101477161..740cc6eac7 100644
--- a/drivers/net/nfp/nfp_rxtx.c
+++ b/drivers/net/nfp/nfp_rxtx.c
@@ -591,6 +591,20 @@ nfp_net_reset_rx_queue(struct nfp_net_rxq *rxq)
 	rxq->nb_rx_hold = 0;
 }
 
+static void
+nfp_rx_queue_setup_flbufsz(struct nfp_net_hw *hw,
+		struct nfp_net_rxq *rxq)
+{
+	if (!hw->flbufsz_set_flag) {
+		hw->flbufsz_set_flag = true;
+		hw->flbufsz = rxq->mbuf_size;
+		return;
+	}
+
+	if (hw->flbufsz < rxq->mbuf_size)
+		hw->flbufsz = rxq->mbuf_size;
+}
+
 int
 nfp_net_rx_queue_setup(struct rte_eth_dev *dev,
 		uint16_t queue_idx,
@@ -649,7 +663,7 @@ nfp_net_rx_queue_setup(struct rte_eth_dev *dev,
 	rxq->mem_pool = mp;
 	rxq->mbuf_size = rxq->mem_pool->elt_size;
 	rxq->mbuf_size -= (sizeof(struct rte_mbuf) + RTE_PKTMBUF_HEADROOM);
-	hw->flbufsz = rxq->mbuf_size;
+	nfp_rx_queue_setup_flbufsz(hw, rxq);
 
 	rxq->rx_count = nb_desc;
 	rxq->port_id = dev->data->port_id;
-- 
2.39.1