[dpdk-dev] [PATCH v1 3/4] net/i40e: support VF request more queues

[Zhirun Yan <zhirun.yan@intel.com>]

Before this patch, VF gets a default number of queues from the PF
This patch enables VF requests a different number. When VF configures
more queues, it will send VIRTCHNL_OP_REQUEST_QUEUES msg to PF to
request more queues, if success, PF will reset the VF.

User can run "port stop all", "port config port_id rxq/txq queue_num"
and "port start all" to reconfigure queue number.

Signed-off-by: Zhirun Yan <zhirun.yan@intel.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 59 ++++++++++++++++++++++++++++---
 1 file changed, 55 insertions(+), 4 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index cecedc91f..691ab99bb 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -343,6 +343,7 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 		err = 0;
 		break;
 	case VIRTCHNL_OP_VERSION:
+	case VIRTCHNL_OP_REQUEST_QUEUES:
 	case VIRTCHNL_OP_GET_VF_RESOURCES:
 		/* for init adminq commands, need to poll the response */
 		err = -1;
@@ -350,8 +351,15 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 			ret = i40evf_read_pfmsg(dev, &info);
 			vf->cmd_retval = info.result;
 			if (ret == I40EVF_MSG_CMD) {
-				err = 0;
+				if (info.ops != VIRTCHNL_OP_REQUEST_QUEUES)
+					err = 0;
 				break;
+			} else if (ret == I40EVF_MSG_SYS) {
+				if (args->ops == VIRTCHNL_OP_REQUEST_QUEUES &&
+					vf->vf_reset) {
+					err = 0;
+					break;
+				}
 			} else if (ret == I40EVF_MSG_ERR)
 				break;
 			rte_delay_ms(ASQ_DELAY_MS);
@@ -1012,6 +1020,28 @@ i40evf_add_vlan(struct rte_eth_dev *dev, uint16_t vlanid)
 	return err;
 }
 
+static int
+i40evf_request_queues(struct rte_eth_dev *dev, uint16_t num)
+{
+	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
+	struct virtchnl_vf_res_request vfres;
+	struct vf_cmd_info args;
+	int err;
+
+	vfres.num_queue_pairs = num;
+
+	args.ops = VIRTCHNL_OP_REQUEST_QUEUES;
+	args.in_args = (u8 *)&vfres;
+	args.in_args_size = sizeof(vfres);
+	args.out_buffer = vf->aq_resp;
+	args.out_size = I40E_AQ_BUF_SZ;
+	err = i40evf_execute_vf_cmd(dev, &args);
+	if (err)
+		PMD_DRV_LOG(ERR, "fail to execute command OP_REQUEST_QUEUES");
+
+	return err;
+}
+
 static int
 i40evf_del_vlan(struct rte_eth_dev *dev, uint16_t vlanid)
 {
@@ -1515,8 +1545,12 @@ RTE_PMD_REGISTER_KMOD_DEP(net_i40e_vf, "* igb_uio | vfio-pci");
 static int
 i40evf_dev_configure(struct rte_eth_dev *dev)
 {
+	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
 	struct i40e_adapter *ad =
 		I40E_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
+	uint16_t num_queue_pairs = RTE_MAX(dev->data->nb_rx_queues,
+				dev->data->nb_tx_queues);
+	int ret = 0;
 
 	/* Initialize to TRUE. If any of Rx queues doesn't meet the bulk
 	 * allocation or vector Rx preconditions we will reset it.
@@ -1526,7 +1560,24 @@ i40evf_dev_configure(struct rte_eth_dev *dev)
 	ad->tx_simple_allowed = true;
 	ad->tx_vec_allowed = true;
 
-	return i40evf_init_vlan(dev);
+	if (num_queue_pairs != vf->vsi_res->num_queue_pairs) {
+		PMD_DRV_LOG(INFO, "change queue pairs from %u to %u",
+					vf->vsi_res->num_queue_pairs, num_queue_pairs);
+		ret = i40evf_request_queues(dev, num_queue_pairs);
+		if (ret != 0)
+			return ret;
+
+		ret = i40evf_dev_reset(dev);
+		vf->vf_reset = false;
+		vf->pend_msg &= ~PFMSG_RESET_IMPENDING;
+
+		if (ret != 0)
+			return ret;
+	}
+
+	i40evf_init_vlan(dev);
+
+	return ret;
 }
 
 static int
@@ -2137,8 +2188,8 @@ i40evf_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 {
 	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
 
-	dev_info->max_rx_queues = vf->vsi_res->num_queue_pairs;
-	dev_info->max_tx_queues = vf->vsi_res->num_queue_pairs;
+	dev_info->max_rx_queues = I40E_MAX_QP_NUM_PER_VF;
+	dev_info->max_tx_queues = I40E_MAX_QP_NUM_PER_VF;
 	dev_info->min_rx_bufsize = I40E_BUF_SIZE_MIN;
 	dev_info->max_rx_pktlen = I40E_FRAME_SIZE_MAX;
 	dev_info->hash_key_size = (I40E_VFQF_HKEY_MAX_INDEX + 1) * sizeof(uint32_t);
-- 
2.17.1