xsk: Rearrange internal structs for better performance

	u32 headroom;

	u32 chunk_size;

	u32 chunks;

	u32 npgs;

	struct user_struct *user;

	refcount_t users;

	struct page **pgs;

	u32 npgs;

	u8 flags;

	int id;

	bool zc;

	struct page **pgs;

	int id;

	struct list_head xsk_dma_list;

};

struct xdp_sock {

	/* struct sock must be the first member of struct xdp_sock */

	struct sock sk;

	struct xsk_queue *rx;

	struct xsk_queue *rx ____cacheline_aligned_in_smp;

	struct net_device *dev;

	struct xdp_umem *umem;

	struct list_head flush_node;

		XSK_BOUND,

		XSK_UNBOUND,

	} state;

	/* Protects multiple processes in the control path */

	struct mutex mutex;

	struct xsk_queue *tx ____cacheline_aligned_in_smp;

	struct list_head tx_list;

	/* Mutual exclusion of NAPI TX thread and sendmsg error paths

	struct list_head map_list;

	/* Protects map_list */

	spinlock_t map_list_lock;

	/* Protects multiple processes in the control path */

	struct mutex mutex;

	struct xsk_queue *fq_tmp; /* Only as tmp storage before bind */

	struct xsk_queue *cq_tmp; /* Only as tmp storage before bind */

};

};

struct xsk_buff_pool {

	struct xsk_queue *fq;

	struct xsk_queue *cq;

	/* Members only used in the control path first. */

	struct device *dev;

	struct net_device *netdev;

	struct list_head xsk_tx_list;

	/* Protects modifications to the xsk_tx_list */

	spinlock_t xsk_tx_list_lock;

	refcount_t users;

	struct xdp_umem *umem;

	struct work_struct work;

	struct list_head free_list;

	u32 heads_cnt;

	u16 queue_id;

	/* Data path members as close to free_heads at the end as possible. */

	struct xsk_queue *fq ____cacheline_aligned_in_smp;

	struct xsk_queue *cq;

	/* For performance reasons, each buff pool has its own array of dma_pages

	 * even when they are identical.

	 */

	u64 addrs_cnt;

	u32 free_list_cnt;

	u32 dma_pages_cnt;

	u32 heads_cnt;

	u32 free_heads_cnt;

	u32 headroom;

	u32 chunk_size;

	u32 frame_len;

	u16 queue_id;

	u8 cached_need_wakeup;

	bool uses_need_wakeup;

	bool dma_need_sync;

	bool unaligned;

	struct xdp_umem *umem;

	void *addrs;

	struct device *dev;

	struct net_device *netdev;

	struct list_head xsk_tx_list;

	/* Protects modifications to the xsk_tx_list */

	spinlock_t xsk_tx_list_lock;

	refcount_t users;

	struct work_struct work;

	struct xdp_buff_xsk *free_heads[];

};