net/hns3: support FEC

Forward error correction (FEC) is a bit error correction mode.
It adds error correction information to data packets at the
transmit end, and uses the error correction information to correct
the bit errors generated during data packet transmission at the
receive end. This improves signal quality but also brings a delay
to signals. This function can be enabled or disabled as required.

This patch adds FEC support for ethdev.Introduce ethdev
operations which support query and config FEC information in
hardware.

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Reviewed-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Reviewed-by: Chengwen Feng <fengchengwen@huawei.com>
Reviewed-by: Chengchang Tang <tangchengchang@huawei.com>

doc/guides/rel_notes/release_20_11.rst

@@ -75,6 +75,11 @@ New Features
   * Added support for non-zero priorities for group 0 flows
   * Added support for VXLAN decap combined with VLAN pop
 
+* **Added hns3 FEC PMD, for supporting query and config FEC mode.**
+
+  Added the FEC PMD which provides functions for query FEC capabilities and
+  current FEC mode from device. Also, PMD for configuring FEC mode is also provided.
+
 * **Updated Solarflare network PMD.**
 
   Updated the Solarflare ``sfc_efx`` driver with changes including:

drivers/net/hns3/hns3_cmd.h

@@ -99,6 +99,7 @@ enum hns3_opcode_type {
 	HNS3_OPC_QUERY_LINK_STATUS      = 0x0307,
 	HNS3_OPC_CONFIG_MAX_FRM_SIZE    = 0x0308,
 	HNS3_OPC_CONFIG_SPEED_DUP       = 0x0309,
+	HNS3_OPC_CONFIG_FEC_MODE        = 0x031A,
 
 	/* PFC/Pause commands */
 	HNS3_OPC_CFG_MAC_PAUSE_EN       = 0x0701,
@@ -687,9 +688,25 @@ struct hns3_config_auto_neg_cmd {
 	uint8_t   rsv[20];
 };
 
+#define HNS3_MAC_CFG_FEC_AUTO_EN_B	0
+#define HNS3_MAC_CFG_FEC_MODE_S		1
+#define HNS3_MAC_CFG_FEC_MODE_M	GENMASK(3, 1)
+#define HNS3_MAC_FEC_OFF		0
+#define HNS3_MAC_FEC_BASER		1
+#define HNS3_MAC_FEC_RS			2
+
 struct hns3_sfp_speed_cmd {
 	uint32_t  sfp_speed;
-	uint32_t  rsv[5];
+	uint8_t   query_type; /* 0: sfp speed, 1: active fec */
+	uint8_t   active_fec; /* current FEC mode */
+	uint16_t  rsv1;
+	uint32_t  rsv2[4];
+};
+
+/* Configure FEC mode, opcode:0x031A */
+struct hns3_config_fec_cmd {
+	uint8_t fec_mode;
+	uint8_t rsv[23];
 };
 
 #define HNS3_MAC_MGR_MASK_VLAN_B		BIT(0)