lib: work around nonstandard bit-fields

Exported header files used by applications should allow the strictest
compiler flags. Language extensions used in many places must be explicitly
marked or removed to avoid warnings and compilation failures.

This commit prevents the following errors:

 error: type of bit-field `[...]' is a GCC extension

Note: the standard does not require implementations to issue a diagnostic
message with these, and such errors do not occur with recent GCC or clang
versions. However, GCC 4.7 is still common and using the extension keyword
is easier than checking compiler version.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>

lib/librte_cryptodev/rte_cryptodev.h

@@ -619,6 +619,7 @@ struct rte_cryptodev {
 	struct rte_cryptodev_cb_list link_intr_cbs;
 	/**< User application callback for interrupts if present */
 
+	__extension__
 	uint8_t attached : 1;
 	/**< Flag indicating the device is attached */
 } __rte_cache_aligned;
@@ -642,6 +643,7 @@ struct rte_cryptodev_data {
 	char name[RTE_CRYPTODEV_NAME_MAX_LEN];
 	/**< Unique identifier name */
 
+	__extension__
 	uint8_t dev_started : 1;
 	/**< Device state: STARTED(1)/STOPPED(0) */
 

lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h

@@ -159,6 +159,7 @@ struct rte_kni_device_info {
 	uint16_t group_id;            /**< Group ID */
 	uint32_t core_id;             /**< core ID to bind for kernel thread */
 
+	__extension__
 	uint8_t force_bind : 1;       /**< Flag for kernel thread binding */
 
 	/* mbuf size */

lib/librte_ether/rte_ethdev.h

@@ -255,6 +255,7 @@ struct rte_eth_stats {
 /**
  * A structure used to retrieve link-level information of an Ethernet port.
  */
+__extension__
 struct rte_eth_link {
 	uint32_t link_speed;        /**< ETH_SPEED_NUM_ */
 	uint16_t link_duplex  : 1;  /**< ETH_LINK_[HALF/FULL]_DUPLEX */
@@ -346,6 +347,7 @@ struct rte_eth_rxmode {
 	enum rte_eth_rx_mq_mode mq_mode;
 	uint32_t max_rx_pkt_len;  /**< Only used if jumbo_frame enabled. */
 	uint16_t split_hdr_size;  /**< hdr buf size (header_split enabled).*/
+	__extension__
 	uint16_t header_split : 1, /**< Header Split enable. */
 		hw_ip_checksum   : 1, /**< IP/UDP/TCP checksum offload enable. */
 		hw_vlan_filter   : 1, /**< VLAN filter enable. */
@@ -645,6 +647,7 @@ struct rte_eth_txmode {
 
 	/* For i40e specifically */
 	uint16_t pvid;
+	__extension__
 	uint8_t hw_vlan_reject_tagged : 1,
 		/**< If set, reject sending out tagged pkts */
 		hw_vlan_reject_untagged : 1,
@@ -1691,6 +1694,7 @@ struct rte_eth_dev_data {
 	struct ether_addr* hash_mac_addrs;
 	/** Device Ethernet MAC addresses of hash filtering. */
 	uint8_t port_id;           /**< Device [external] port identifier. */
+	__extension__
 	uint8_t promiscuous   : 1, /**< RX promiscuous mode ON(1) / OFF(0). */
 		scattered_rx : 1,  /**< RX of scattered packets is ON(1) / OFF(0) */
 		all_multicast : 1, /**< RX all multicast mode ON(1) / OFF(0). */

lib/librte_kni/rte_kni.h

@@ -88,6 +88,7 @@ struct rte_kni_conf {
 	struct rte_pci_addr addr;
 	struct rte_pci_id id;
 
+	__extension__
 	uint8_t force_bind : 1; /* Flag to bind kernel thread */
 };
 

lib/librte_lpm/rte_lpm.h

@@ -93,6 +93,7 @@ extern "C" {
 
 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
 /** @internal Tbl24 entry structure. */
+__extension__
 struct rte_lpm_tbl_entry_v20 {
 	/**
 	 * Stores Next hop (tbl8 or tbl24 when valid_group is not set) or
@@ -116,6 +117,7 @@ struct rte_lpm_tbl_entry_v20 {
 	uint8_t depth       :6; /**< Rule depth. */
 };
 
+__extension__
 struct rte_lpm_tbl_entry {
 	/**
 	 * Stores Next hop (tbl8 or tbl24 when valid_group is not set) or
@@ -137,6 +139,7 @@ struct rte_lpm_tbl_entry {
 };
 
 #else
+__extension__
 struct rte_lpm_tbl_entry_v20 {
 	uint8_t depth       :6;
 	uint8_t valid_group :1;
@@ -147,6 +150,7 @@ struct rte_lpm_tbl_entry_v20 {
 	};
 };
 
+__extension__
 struct rte_lpm_tbl_entry {
 	uint32_t depth       :6;
 	uint32_t valid_group :1;

lib/librte_mbuf/rte_mbuf.h

@@ -865,6 +865,7 @@ struct rte_mbuf {
 	/* fields to support TX offloads */
 	union {
 		uint64_t tx_offload;       /**< combined for easy fetch */
+		__extension__
 		struct {
 			uint64_t l2_len:7; /**< L2 (MAC) Header Length. */
 			uint64_t l3_len:9; /**< L3 (IP) Header Length. */