[dpdk-dev] [PATCH 02/11] net/hns3: support setting VF MAC address by PF driver

["Wei Hu (Xavier)" <huwei013@chinasoftinc.com>]

From: "Wei Hu (Xavier)" <xavier.huwei@huawei.com>

Currently, we only support VF device is bound to vfio_pci or igb_uio and
then driven by DPDK driver when PF is driven by kernel mode hns3 ethdev
driver, VF is not supported when PF is driven by hns3 DPDK driver.

This patch adds support setting VF MAC address by hns3 PF kernel ethdev
driver on the host by "ip link set ..." command.
1) If the hns3 PF kernel ethdev driver sets the MAC address for VF device
   before the initialization of the related VF device, hns3 VF PMD driver
   should get the MAC address from PF driver through mailbox and configure
   hardware using this MAC address in the initialization. The hns3 VF PMD
   driver get the MAC address form PF driver, if obtaining a non-zero MAC
   address from mailbox, VF driver will configure hardware using it,
   otherwise using a random MAC address in the initialization of VF device.
2) If the hns3 PF kernel ethdev driver sets the MAC address for VF device
   after the initialization of the related VF device, the PF driver will
   notify VF driver to reset VF device to make the new MAC address
   effective immediately. The hns3 VF PMD driver should check whether the
   MAC address has been changed by the PF kernel netdevice driver, if
   changed VF driver should configure hardware using the new MAC address
   in the recovering hardware configuration stage of the reset process.
3) When user has configured a mac address for VF device by
   "ip link set ..." command based on the PF device, the hns3 PF kernel
   ethdev driver does not allow VF driver to request reconfiguring a
   different default mac address and return -EPREM to VF driver through
   mailbox.

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Hongbo Zheng <zhenghongbo3@huawei.com>
---
 drivers/net/hns3/hns3_ethdev_vf.c | 108 ++++++++++++++++++++++++++++--
 1 file changed, 102 insertions(+), 6 deletions(-)

diff --git a/drivers/net/hns3/hns3_ethdev_vf.c b/drivers/net/hns3/hns3_ethdev_vf.c
index 71e358e81..92cf7ee99 100644
--- a/drivers/net/hns3/hns3_ethdev_vf.c
+++ b/drivers/net/hns3/hns3_ethdev_vf.c
@@ -208,12 +208,27 @@ hns3vf_set_default_mac_addr(struct rte_eth_dev *dev,
 
 	ret = hns3_send_mbx_msg(hw, HNS3_MBX_SET_UNICAST,
 				HNS3_MBX_MAC_VLAN_UC_MODIFY, addr_bytes,
-				HNS3_TWO_ETHER_ADDR_LEN, false, NULL, 0);
+				HNS3_TWO_ETHER_ADDR_LEN, true, NULL, 0);
 	if (ret) {
-		rte_ether_format_addr(mac_str, RTE_ETHER_ADDR_FMT_SIZE,
-				      mac_addr);
-		hns3_err(hw, "Failed to set mac addr(%s) for vf: %d", mac_str,
-			 ret);
+		/*
+		 * The hns3 VF PMD driver depends on the hns3 PF kernel ethdev
+		 * driver. When user has configured a MAC address for VF device
+		 * by "ip link set ..." command based on the PF device, the hns3
+		 * PF kernel ethdev driver does not allow VF driver to request
+		 * reconfiguring a different default MAC address, and return
+		 * -EPREM to VF driver through mailbox.
+		 */
+		if (ret == -EPERM) {
+			rte_ether_format_addr(mac_str, RTE_ETHER_ADDR_FMT_SIZE,
+					      old_addr);
+			hns3_warn(hw, "Has permanet mac addr(%s) for vf",
+				  mac_str);
+		} else {
+			rte_ether_format_addr(mac_str, RTE_ETHER_ADDR_FMT_SIZE,
+					      mac_addr);
+			hns3_err(hw, "Failed to set mac addr(%s) for vf: %d",
+				 mac_str, ret);
+		}
 	}
 
 	rte_ether_addr_copy(mac_addr,
@@ -784,6 +799,24 @@ hns3vf_get_tc_info(struct hns3_hw *hw)
 	return 0;
 }
 
+static int
+hns3vf_get_host_mac_addr(struct hns3_hw *hw)
+{
+	uint8_t host_mac[RTE_ETHER_ADDR_LEN];
+	int ret;
+
+	ret = hns3_send_mbx_msg(hw, HNS3_MBX_GET_MAC_ADDR, 0, NULL, 0,
+				true, host_mac, RTE_ETHER_ADDR_LEN);
+	if (ret) {
+		hns3_err(hw, "Failed to get mac addr from PF: %d", ret);
+		return ret;
+	}
+
+	memcpy(hw->mac.mac_addr, host_mac, RTE_ETHER_ADDR_LEN);
+
+	return 0;
+}
+
 static int
 hns3vf_get_configuration(struct hns3_hw *hw)
 {
@@ -801,6 +834,11 @@ hns3vf_get_configuration(struct hns3_hw *hw)
 	if (ret)
 		return ret;
 
+	/* Get user defined VF MAC addr from PF */
+	ret = hns3vf_get_host_mac_addr(hw);
+	if (ret)
+		return ret;
+
 	/* Get tc configuration from PF */
 	return hns3vf_get_tc_info(hw);
 }
@@ -1170,7 +1208,20 @@ hns3vf_init_vf(struct rte_eth_dev *eth_dev)
 		goto err_get_config;
 	}
 
-	rte_eth_random_addr(hw->mac.mac_addr); /* Generate a random mac addr */
+	/*
+	 * The hns3 PF ethdev driver in kernel support setting VF MAC address
+	 * on the host by "ip link set ..." command. To avoid some incorrect
+	 * scenes, for example, hns3 VF PMD driver fails to receive and send
+	 * packets after user configure the MAC address by using the
+	 * "ip link set ..." command, hns3 VF PMD driver keep the same MAC
+	 * address strategy as the hns3 kernel ethdev driver in the
+	 * initialization. If user configure a MAC address by the ip command
+	 * for VF device, then hns3 VF PMD driver will start with it, otherwise
+	 * start with a random MAC address in the initialization.
+	 */
+	ret = rte_is_zero_ether_addr((struct rte_ether_addr *)hw->mac.mac_addr);
+	if (ret)
+		rte_eth_random_addr(hw->mac.mac_addr);
 
 	ret = hns3vf_clear_vport_list(hw);
 	if (ret) {
@@ -1663,12 +1714,57 @@ hns3vf_start_service(struct hns3_adapter *hns)
 	return 0;
 }
 
+static int
+hns3vf_check_default_mac_change(struct hns3_hw *hw)
+{
+	char mac_str[RTE_ETHER_ADDR_FMT_SIZE];
+	struct rte_ether_addr *hw_mac;
+	int ret;
+
+	/*
+	 * The hns3 PF ethdev driver in kernel support setting VF MAC address
+	 * on the host by "ip link set ..." command. If the hns3 PF kernel
+	 * ethdev driver sets the MAC address for VF device after the
+	 * initialization of the related VF device, the PF driver will notify
+	 * VF driver to reset VF device to make the new MAC address effective
+	 * immediately. The hns3 VF PMD driver should check whether the MAC
+	 * address has been changed by the PF kernel ethdev driver, if changed
+	 * VF driver should configure hardware using the new MAC address in the
+	 * recovering hardware configuration stage of the reset process.
+	 */
+	ret = hns3vf_get_host_mac_addr(hw);
+	if (ret)
+		return ret;
+
+	hw_mac = (struct rte_ether_addr *)hw->mac.mac_addr;
+	ret = rte_is_zero_ether_addr(hw_mac);
+	if (ret)
+		rte_ether_addr_copy(&hw->data->mac_addrs[0], hw_mac);
+	else {
+		ret = rte_is_same_ether_addr(&hw->data->mac_addrs[0], hw_mac);
+		if (!ret) {
+			rte_ether_addr_copy(hw_mac, &hw->data->mac_addrs[0]);
+			rte_ether_format_addr(mac_str, RTE_ETHER_ADDR_FMT_SIZE,
+					      &hw->data->mac_addrs[0]);
+			hns3_warn(hw, "Default MAC address has been changed to:"
+				  " %s by the host PF kernel ethdev driver",
+				  mac_str);
+		}
+	}
+
+	return 0;
+}
+
 static int
 hns3vf_restore_conf(struct hns3_adapter *hns)
 {
 	struct hns3_hw *hw = &hns->hw;
 	int ret;
 
+	ret = hns3vf_check_default_mac_change(hw);
+	if (ret)
+		return ret;
+
 	ret = hns3vf_configure_mac_addr(hns, false);
 	if (ret)
 		return ret;
-- 
2.23.0