net/nbl: change default Rx extension header size to 12 bytes

The default Rx extension header size is reduced from 16 bytes to 12 bytes.
This reduction saves PCIe bandwidth by decreasing packet overhead.

Signed-off-by: Dimon Zhao <[email protected]>

Author: Dimon-Zhao

drivers/net/nbl/nbl_dev/nbl_dev.c

@@ -87,7 +87,7 @@ static int nbl_dev_txrx_start(struct rte_eth_dev *eth_dev)
 		param.local_queue_id = i + ring_mgt->queue_offset;
 		param.intr_en = 0;
 		param.intr_mask = 0;
-		param.half_offload_en = 1;
+		param.half_offload_en = ring_mgt->rx_hash_en;
 		param.extend_header = 1;
 		param.split = 0;
 		param.rxcsum = 1;
@@ -266,6 +266,7 @@ int nbl_rx_queue_setup(struct rte_eth_dev *eth_dev, u16 queue_idx,
 	param.conf = conf;
 	param.mempool = mempool;
 	param.product = adapter->caps.product_type;
+	param.rx_hash_en = ring_mgt->rx_hash_en;
 	ret =  disp_ops->start_rx_ring(NBL_DEV_MGT_TO_DISP_PRIV(dev_mgt), &param, &rx_ring->dma);
 	if (ret) {
 		NBL_LOG(ERR, "start_rx_ring failed %d", ret);
@@ -993,6 +994,7 @@ int nbl_dev_init(void *p, struct rte_eth_dev *eth_dev)
 			       eth_dev->data->mac_addrs[0].addr_bytes);
 
 	adapter->state = NBL_ETHDEV_INITIALIZED;
+	(*dev_mgt)->net_dev->ring_mgt.rx_hash_en = 0;
 	eth_dev->data->dev_flags |= RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;
 	disp_ops->get_resource_pt_ops(NBL_DEV_MGT_TO_DISP_PRIV(*dev_mgt),
 				      &(*dev_mgt)->pt_ops, 0);

drivers/net/nbl/nbl_dev/nbl_dev.h

@@ -35,6 +35,7 @@ struct nbl_dev_ring_mgt {
 	u8 tx_ring_num;
 	u8 rx_ring_num;
 	u8 active_ring_num;
+	bool rx_hash_en;
 };
 
 struct nbl_dev_net_mgt {

drivers/net/nbl/nbl_hw/nbl_resource.h

@@ -197,6 +197,7 @@ struct nbl_res_rx_ring {
 
 	u16 avail_used_flags;
 	bool used_wrap_counter;
+	bool rx_hash_en;
 	u16 notify_qid;
 	u16 exthdr_len;
 

drivers/net/nbl/nbl_hw/nbl_txrx.c

@@ -284,10 +284,14 @@ static int nbl_res_txrx_start_rx_ring(void *priv,
 	rx_ring->dma_limit_msb = common->dma_limit_msb;
 	rx_ring->common = common;
 	rx_ring->notify = hw_ops->get_tail_ptr(NBL_RES_MGT_TO_HW_PRIV(res_mgt));
+	rx_ring->rx_hash_en = param->rx_hash_en;
 
 	switch (param->product) {
 	case NBL_LEONIS_TYPE:
-		rx_ring->exthdr_len = sizeof(struct nbl_rx_ehdr_leonis);
+		if (param->rx_hash_en)
+			rx_ring->exthdr_len = sizeof(struct nbl_rx_ehdr_leonis);
+		else
+			rx_ring->exthdr_len = sizeof(struct nbl_rx_ehdr_leonis) - 4;
 		break;
 	default:
 		rx_ring->exthdr_len = sizeof(union nbl_rx_extend_head);

drivers/net/nbl/nbl_include/nbl_include.h

@@ -82,9 +82,10 @@ struct nbl_start_rx_ring_param {
 	u16 queue_idx;
 	u16 nb_desc;
 	u32 socket_id;
-	enum nbl_product_type product;
 	const struct rte_eth_rxconf *conf;
 	struct rte_mempool *mempool;
+	enum nbl_product_type product;
+	bool rx_hash_en;
 };
 
 struct nbl_start_tx_ring_param {