net/iavf: release large VF when closing device

[ upstream commit cdd8d6dfd156709b05ce363d7c5f491cc927330a ]

Multiple vfs created based on one PF. If one of the vf requests a large
number of queues, the queue resources are not released when exiting the
program, resulting in these queues cannot be available to other vfs.

This commit fixes the issue by resetting the number of queues to default
when closing the dev (refer to the kernel driver) .

Fixes: e436cd4 ("net/iavf: negotiate large VF and request more queues")

Signed-off-by: Shiyang He <shiyangx.he@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

drivers/net/iavf/iavf_ethdev.c

@@ -2660,6 +2660,18 @@ iavf_dev_close(struct rte_eth_dev *dev)
 	if (vf->promisc_unicast_enabled || vf->promisc_multicast_enabled)
 		iavf_config_promisc(adapter, false, false);
 
+	/*
+	 * Release redundant queue resource when close the dev
+	 * so that other vfs can re-use the queues.
+	 */
+	if (vf->lv_enabled) {
+		ret = iavf_request_queues(dev, IAVF_MAX_NUM_QUEUES_DFLT);
+		if (ret)
+			PMD_DRV_LOG(ERR, "Reset the num of queues failed");
+
+		vf->max_rss_qregion = IAVF_MAX_NUM_QUEUES_DFLT;
+	}
+
 	iavf_shutdown_adminq(hw);
 	if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_WB_ON_ITR) {
 		/* disable uio intr before callback unregister */