[dpdk-dev] [PATCH v2 2/2] net/i40e: support PF respond VF request more queues

[Zhirun Yan]

This patch respond the VIRTCHNL_OP_REQUEST_QUEUES msg from VF, and
process to allocated more queues for the requested VF. If successful,
PF will notify VF to reset. If unsuccessful, PF will send message to
inform VF.

Signed-off-by: Zhirun Yan <zhirun.yan at intel.com>
Signed-off-by: Haiyue Wang <haiyue.wang at intel.com>
---
 drivers/net/i40e/i40e_pf.c | 67 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/drivers/net/i40e/i40e_pf.c b/drivers/net/i40e/i40e_pf.c
index dd3962d38..789a98dc7 100644
--- a/drivers/net/i40e/i40e_pf.c
+++ b/drivers/net/i40e/i40e_pf.c
@@ -1218,6 +1218,68 @@ i40e_notify_vf_link_status(struct rte_eth_dev *dev, struct i40e_pf_vf *vf)
 			I40E_SUCCESS, (uint8_t *)&event, sizeof(event));
 }
 
+/**
+ * i40e_vc_notify_vf_reset
+ * @vf: pointer to the VF structure
+ *
+ * indicate a pending reset to the given VF
+ **/
+static void
+i40e_vc_notify_vf_reset(struct i40e_pf_vf *vf)
+{
+	struct i40e_hw *hw = I40E_PF_TO_HW(vf->pf);
+	struct virtchnl_pf_event pfe;
+	int abs_vf_id;
+	uint16_t vf_id = vf->vf_idx;
+
+	abs_vf_id = vf_id + hw->func_caps.vf_base_id;
+	pfe.event = VIRTCHNL_EVENT_RESET_IMPENDING;
+	pfe.severity = PF_EVENT_SEVERITY_CERTAIN_DOOM;
+	i40e_aq_send_msg_to_vf(hw, abs_vf_id, VIRTCHNL_OP_EVENT,
+						   0, (u8 *)&pfe,
+						   sizeof(struct virtchnl_pf_event), NULL);
+}
+
+static int
+i40e_pf_host_process_cmd_request_queues(struct i40e_pf_vf *vf,
+			uint8_t *msg)
+{
+	struct virtchnl_vf_res_request *vfres =
+		(struct virtchnl_vf_res_request *)msg;
+	struct i40e_pf *pf;
+	uint32_t req_pairs = vfres->num_queue_pairs;
+	uint32_t cur_pairs = vf->vsi->nb_used_qps;
+
+	pf = vf->pf;
+
+	if (req_pairs <= 0) {
+		PMD_DRV_LOG(ERR, "VF %d tried to request %d queues. Ignoring.\n",
+					vf->vf_idx,
+					I40E_MAX_QP_NUM_PER_VF);
+	} else if (req_pairs > I40E_MAX_QP_NUM_PER_VF) {
+		PMD_DRV_LOG(ERR, "VF %d tried to request more than %d queues.\n",
+					vf->vf_idx,
+					I40E_MAX_QP_NUM_PER_VF);
+		vfres->num_queue_pairs = I40E_MAX_QP_NUM_PER_VF;
+	} else if (req_pairs > cur_pairs + pf->qp_pool.num_free) {
+		PMD_DRV_LOG(ERR, "VF %d requested %d more queues, but noly %d left\n",
+					vf->vf_idx,
+					req_pairs - cur_pairs,
+					pf->qp_pool.num_free);
+		vfres->num_queue_pairs = pf->qp_pool.num_free + cur_pairs;
+	} else {
+		i40e_vc_notify_vf_reset(vf);
+		vf->vsi->nb_qps = req_pairs;
+		pf->vf_nb_qps = req_pairs;
+		i40e_pf_host_process_cmd_reset_vf(vf);
+
+		return 0;
+	}
+
+	return i40e_pf_host_send_msg_to_vf(vf, VIRTCHNL_OP_REQUEST_QUEUES, 0,
+				(u8 *)vfres, sizeof(*vfres));
+}
+
 void
 i40e_pf_host_handle_vf_msg(struct rte_eth_dev *dev,
 			   uint16_t abs_vf_id, uint32_t opcode,
@@ -1351,6 +1413,11 @@ i40e_pf_host_handle_vf_msg(struct rte_eth_dev *dev,
 		PMD_DRV_LOG(INFO, "OP_CONFIG_RSS_KEY received");
 		i40e_pf_host_process_cmd_set_rss_key(vf, msg, msglen, b_op);
 		break;
+	case VIRTCHNL_OP_REQUEST_QUEUES:
+		PMD_DRV_LOG(INFO, "OP_REQUEST_QUEUES received");
+		i40e_pf_host_process_cmd_request_queues(vf, msg);
+		break;
+
 	/* Don't add command supported below, which will
 	 * return an error code.
 	 */
-- 
2.17.1