/* SPDX-License-Identifier: GPL-2.0-only */
/* include/net/xdp.h
 *
 * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
 */
#ifndef __LINUX_NET_XDP_H__
#define __LINUX_NET_XDP_H__

#include <linux/bitfield.h>
#include <linux/filter.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h> /* skb_shared_info */

#include <net/page_pool/types.h>

/**
 * DOC: XDP RX-queue information
 *
 * The XDP RX-queue info (xdp_rxq_info) is associated with the driver
 * level RX-ring queues.  It is information that is specific to how
 * the driver has configured a given RX-ring queue.
 *
 * Each xdp_buff frame received in the driver carries a (pointer)
 * reference to this xdp_rxq_info structure.  This provides the XDP
 * data-path read-access to RX-info for both kernel and bpf-side
 * (limited subset).
 *
 * For now, direct access is only safe while running in NAPI/softirq
 * context.  Contents are read-mostly and must not be updated during
 * driver NAPI/softirq poll.
 *
 * The driver usage API is a register and unregister API.
 *
 * The struct is not directly tied to the XDP prog.  A new XDP prog
 * can be attached as long as it doesn't change the underlying
 * RX-ring.  If the RX-ring does change significantly, the NIC driver
 * naturally needs to stop the RX-ring before purging and reallocating
 * memory.  In that process the driver MUST call unregister (which
 * also applies for driver shutdown and unload).  The register API is
 * also mandatory during RX-ring setup.
 */

enum xdp_mem_type {
        MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */
        MEM_TYPE_PAGE_ORDER0,     /* Orig XDP full page model */
        MEM_TYPE_PAGE_POOL,
        MEM_TYPE_XSK_BUFF_POOL,
        MEM_TYPE_MAX,
};

/* XDP flags for ndo_xdp_xmit */
#define XDP_XMIT_FLUSH          (1U << 0)       /* doorbell signal consumer */
#define XDP_XMIT_FLAGS_MASK     XDP_XMIT_FLUSH

struct xdp_mem_info {
        u32 type; /* enum xdp_mem_type, but known size type */
        u32 id;
};

struct page_pool;

struct xdp_rxq_info {
        struct net_device *dev;
        u32 queue_index;
        u32 reg_state;
        struct xdp_mem_info mem;
        u32 frag_size;
} ____cacheline_aligned; /* perf critical, avoid false-sharing */

struct xdp_txq_info {
        struct net_device *dev;
};

enum xdp_buff_flags {
        XDP_FLAGS_HAS_FRAGS             = BIT(0), /* non-linear xdp buff */
        XDP_FLAGS_FRAGS_PF_MEMALLOC     = BIT(1), /* xdp paged memory is under
                                                   * pressure
                                                   */
        /* frags have unreadable mem, this can't be true for real XDP packets,
         * but drivers may use XDP helpers to construct Rx pkt state even when
         * XDP program is not attached.
         */
        XDP_FLAGS_FRAGS_UNREADABLE      = BIT(2),
};

struct xdp_buff {
        void *data;
        void *data_end;
        void *data_meta;
        void *data_hard_start;
        struct xdp_rxq_info *rxq;
        struct xdp_txq_info *txq;

        union {
                struct {
                        /* frame size to deduce data_hard_end/tailroom */
                        u32 frame_sz;
                        /* supported values defined in xdp_buff_flags */
                        u32 flags;
                };

#ifdef __LITTLE_ENDIAN
                /* Used to micro-optimize xdp_init_buff(), don't use directly */
                u64 frame_sz_flags_init;
#endif
        };
};

static __always_inline bool xdp_buff_has_frags(const struct xdp_buff *xdp)
{
        return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS);
}

static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp)
{
        xdp->flags |= XDP_FLAGS_HAS_FRAGS;
}

static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp)
{
        xdp->flags &= ~XDP_FLAGS_HAS_FRAGS;
}

static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp)
{
        xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC;
}

static __always_inline void xdp_buff_set_frag_unreadable(struct xdp_buff *xdp)
{
        xdp->flags |= XDP_FLAGS_FRAGS_UNREADABLE;
}

static __always_inline u32 xdp_buff_get_skb_flags(const struct xdp_buff *xdp)
{
        return xdp->flags;
}

static __always_inline void xdp_buff_clear_frag_pfmemalloc(struct xdp_buff *xdp)
{
        xdp->flags &= ~XDP_FLAGS_FRAGS_PF_MEMALLOC;
}

static __always_inline void
xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq)
{
        xdp->rxq = rxq;

#ifdef __LITTLE_ENDIAN
        /*
         * Force the compilers to initialize ::flags and assign ::frame_sz with
         * one write on 64-bit LE architectures as they're often unable to do
         * it themselves.
         */
        xdp->frame_sz_flags_init = frame_sz;
#else
        xdp->frame_sz = frame_sz;
        xdp->flags = 0;
#endif
}

static __always_inline void
xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start,
                 int headroom, int data_len, const bool meta_valid)
{
        unsigned char *data = hard_start + headroom;

        xdp->data_hard_start = hard_start;
        xdp->data = data;
        xdp->data_end = data + data_len;
        xdp->data_meta = meta_valid ? data : data + 1;
}

/* Reserve memory area at end-of data area.
 *
 * This macro reserves tailroom in the XDP buffer by limiting the
 * XDP/BPF data access to data_hard_end.  Notice same area (and size)
 * is used for XDP_PASS, when constructing the SKB via build_skb().
 */
#define xdp_data_hard_end(xdp)                          \
        ((xdp)->data_hard_start + (xdp)->frame_sz -     \
         SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))

static inline struct skb_shared_info *
xdp_get_shared_info_from_buff(const struct xdp_buff *xdp)
{
        return (struct skb_shared_info *)xdp_data_hard_end(xdp);
}

static __always_inline unsigned int
xdp_get_buff_len(const struct xdp_buff *xdp)
{
        unsigned int len = xdp->data_end - xdp->data;
        const struct skb_shared_info *sinfo;

        if (likely(!xdp_buff_has_frags(xdp)))
                goto out;

        sinfo = xdp_get_shared_info_from_buff(xdp);
        len += sinfo->xdp_frags_size;
out:
        return len;
}

void xdp_return_frag(netmem_ref netmem, const struct xdp_buff *xdp);

/**
 * __xdp_buff_add_frag - attach frag to &xdp_buff
 * @xdp: XDP buffer to attach the frag to
 * @netmem: network memory containing the frag
 * @offset: offset at which the frag starts
 * @size: size of the frag
 * @truesize: total memory size occupied by the frag
 * @try_coalesce: whether to try coalescing the frags (not valid for XSk)
 *
 * Attach frag to the XDP buffer. If it currently has no frags attached,
 * initialize the related fields, otherwise check that the frag number
 * didn't reach the limit of ``MAX_SKB_FRAGS``. If possible, try coalescing
 * the frag with the previous one.
 * The function doesn't check/update the pfmemalloc bit. Please use the
 * non-underscored wrapper in drivers.
 *
 * Return: true on success, false if there's no space for the frag in
 * the shared info struct.
 */
static inline bool __xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem,
                                       u32 offset, u32 size, u32 truesize,
                                       bool try_coalesce)
{
        struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp);
        skb_frag_t *prev;
        u32 nr_frags;

        if (!xdp_buff_has_frags(xdp)) {
                xdp_buff_set_frags_flag(xdp);

                nr_frags = 0;
                sinfo->xdp_frags_size = 0;
                sinfo->xdp_frags_truesize = 0;

                goto fill;
        }

        nr_frags = sinfo->nr_frags;
        prev = &sinfo->frags[nr_frags - 1];

        if (try_coalesce && netmem == skb_frag_netmem(prev) &&
            offset == skb_frag_off(prev) + skb_frag_size(prev)) {
                skb_frag_size_add(prev, size);
                /* Guaranteed to only decrement the refcount */
                xdp_return_frag(netmem, xdp);
        } else if (unlikely(nr_frags == MAX_SKB_FRAGS)) {
                return false;
        } else {
fill:
                __skb_fill_netmem_desc_noacc(sinfo, nr_frags++, netmem,
                                             offset, size);
        }

        sinfo->nr_frags = nr_frags;
        sinfo->xdp_frags_size += size;
        sinfo->xdp_frags_truesize += truesize;

        return true;
}

/**
 * xdp_buff_add_frag - attach frag to &xdp_buff
 * @xdp: XDP buffer to attach the frag to
 * @netmem: network memory containing the frag
 * @offset: offset at which the frag starts
 * @size: size of the frag
 * @truesize: total memory size occupied by the frag
 *
 * Version of __xdp_buff_add_frag() which takes care of the pfmemalloc bit.
 *
 * Return: true on success, false if there's no space for the frag in
 * the shared info struct.
 */
static inline bool xdp_buff_add_frag(struct xdp_buff *xdp, netmem_ref netmem,
                                     u32 offset, u32 size, u32 truesize)
{
        if (!__xdp_buff_add_frag(xdp, netmem, offset, size, truesize, true))
                return false;

        if (unlikely(netmem_is_pfmemalloc(netmem)))
                xdp_buff_set_frag_pfmemalloc(xdp);
        if (unlikely(netmem_is_net_iov(netmem)))
                xdp_buff_set_frag_unreadable(xdp);

        return true;
}

struct xdp_frame {
        void *data;
        u32 len;
        u32 headroom;
        u32 metasize; /* uses lower 8-bits */
        /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time,
         * while mem_type is valid on remote CPU.
         */
        enum xdp_mem_type mem_type:32;
        struct net_device *dev_rx; /* used by cpumap */
        u32 frame_sz;
        u32 flags; /* supported values defined in xdp_buff_flags */
};

static __always_inline bool xdp_frame_has_frags(const struct xdp_frame *frame)
{
        return !!(frame->flags & XDP_FLAGS_HAS_FRAGS);
}

static __always_inline u32
xdp_frame_get_skb_flags(const struct xdp_frame *frame)
{
        return frame->flags;
}

#define XDP_BULK_QUEUE_SIZE     16
struct xdp_frame_bulk {
        int count;
        netmem_ref q[XDP_BULK_QUEUE_SIZE];
};

static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq)
{
        bq->count = 0;
}

static inline struct skb_shared_info *
xdp_get_shared_info_from_frame(const struct xdp_frame *frame)
{
        void *data_hard_start = frame->data - frame->headroom - sizeof(*frame);

        return (struct skb_shared_info *)(data_hard_start + frame->frame_sz -
                                SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
}

struct xdp_cpumap_stats {
        unsigned int redirect;
        unsigned int pass;
        unsigned int drop;
};

/* Clear kernel pointers in xdp_frame */
static inline void xdp_scrub_frame(struct xdp_frame *frame)
{
        frame->data = NULL;
        frame->dev_rx = NULL;
}

static inline void
xdp_update_skb_frags_info(struct sk_buff *skb, u8 nr_frags,
                          unsigned int size, unsigned int truesize,
                          u32 xdp_flags)
{
        struct skb_shared_info *sinfo = skb_shinfo(skb);

        sinfo->nr_frags = nr_frags;
        /*
         * ``destructor_arg`` is unionized with ``xdp_frags_{,true}size``,
         * reset it after that these fields aren't used anymore.
         */
        sinfo->destructor_arg = NULL;

        skb->len += size;
        skb->data_len += size;
        skb->truesize += truesize;
        skb->pfmemalloc |= !!(xdp_flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
        skb->unreadable |= !!(xdp_flags & XDP_FLAGS_FRAGS_UNREADABLE);
}

/* Avoids inlining WARN macro in fast-path */
void xdp_warn(const char *msg, const char *func, const int line);
#define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__)

struct sk_buff *xdp_build_skb_from_buff(const struct xdp_buff *xdp);
struct sk_buff *xdp_build_skb_from_zc(struct xdp_buff *xdp);
struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp);
struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf,
                                           struct sk_buff *skb,
                                           struct net_device *dev);
struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf,
                                         struct net_device *dev);
struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf);

static inline
void xdp_convert_frame_to_buff(const struct xdp_frame *frame,
                               struct xdp_buff *xdp)
{
        xdp->data_hard_start = frame->data - frame->headroom - sizeof(*frame);
        xdp->data = frame->data;
        xdp->data_end = frame->data + frame->len;
        xdp->data_meta = frame->data - frame->metasize;
        xdp->frame_sz = frame->frame_sz;
        xdp->flags = frame->flags;
}

static inline
int xdp_update_frame_from_buff(const struct xdp_buff *xdp,
                               struct xdp_frame *xdp_frame)
{
        int metasize, headroom;

        /* Assure headroom is available for storing info */
        headroom = xdp->data - xdp->data_hard_start;
        metasize = xdp->data - xdp->data_meta;
        metasize = metasize > 0 ? metasize : 0;
        if (unlikely((headroom - metasize) < sizeof(*xdp_frame)))
                return -ENOSPC;

        /* Catch if driver didn't reserve tailroom for skb_shared_info */
        if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) {
                XDP_WARN("Driver BUG: missing reserved tailroom");
                return -ENOSPC;
        }

        xdp_frame->data = xdp->data;
        xdp_frame->len  = xdp->data_end - xdp->data;
        xdp_frame->headroom = headroom - sizeof(*xdp_frame);
        xdp_frame->metasize = metasize;
        xdp_frame->frame_sz = xdp->frame_sz;
        xdp_frame->flags = xdp->flags;

        return 0;
}

/* Convert xdp_buff to xdp_frame */
static inline
struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp)
{
        struct xdp_frame *xdp_frame;

        if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)
                return xdp_convert_zc_to_xdp_frame(xdp);

        /* Store info in top of packet */
        xdp_frame = xdp->data_hard_start;
        if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0))
                return NULL;

        /* rxq only valid until napi_schedule ends, convert to xdp_mem_type */
        xdp_frame->mem_type = xdp->rxq->mem.type;

        return xdp_frame;
}

void __xdp_return(netmem_ref netmem, enum xdp_mem_type mem_type,
                  bool napi_direct, struct xdp_buff *xdp);
void xdp_return_frame(struct xdp_frame *xdpf);
void xdp_return_frame_rx_napi(struct xdp_frame *xdpf);
void xdp_return_buff(struct xdp_buff *xdp);
void xdp_return_frame_bulk(struct xdp_frame *xdpf,
                           struct xdp_frame_bulk *bq);

static inline void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq)
{
        if (unlikely(!bq->count))
                return;

        page_pool_put_netmem_bulk(bq->q, bq->count);
        bq->count = 0;
}

static __always_inline unsigned int
xdp_get_frame_len(const struct xdp_frame *xdpf)
{
        const struct skb_shared_info *sinfo;
        unsigned int len = xdpf->len;

        if (likely(!xdp_frame_has_frags(xdpf)))
                goto out;

        sinfo = xdp_get_shared_info_from_frame(xdpf);
        len += sinfo->xdp_frags_size;
out:
        return len;
}

int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
                       struct net_device *dev, u32 queue_index,
                       unsigned int napi_id, u32 frag_size);
static inline int
xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
                 struct net_device *dev, u32 queue_index,
                 unsigned int napi_id)
{
        return __xdp_rxq_info_reg(xdp_rxq, dev, queue_index, napi_id, 0);
}

void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq);
void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq);
bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
                               enum xdp_mem_type type, void *allocator);
void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq);
int xdp_reg_mem_model(struct xdp_mem_info *mem,
                      enum xdp_mem_type type, void *allocator);
void xdp_unreg_mem_model(struct xdp_mem_info *mem);
int xdp_reg_page_pool(struct page_pool *pool);
void xdp_unreg_page_pool(const struct page_pool *pool);
void xdp_rxq_info_attach_page_pool(struct xdp_rxq_info *xdp_rxq,
                                   const struct page_pool *pool);

/**
 * xdp_rxq_info_attach_mem_model - attach registered mem info to RxQ info
 * @xdp_rxq: XDP RxQ info to attach the memory info to
 * @mem: already registered memory info
 *
 * If the driver registers its memory providers manually, it must use this
 * function instead of xdp_rxq_info_reg_mem_model().
 */
static inline void
xdp_rxq_info_attach_mem_model(struct xdp_rxq_info *xdp_rxq,
                              const struct xdp_mem_info *mem)
{
        xdp_rxq->mem = *mem;
}

/**
 * xdp_rxq_info_detach_mem_model - detach registered mem info from RxQ info
 * @xdp_rxq: XDP RxQ info to detach the memory info from
 *
 * If the driver registers its memory providers manually and then attaches it
 * via xdp_rxq_info_attach_mem_model(), it must call this function before
 * xdp_rxq_info_unreg().
 */
static inline void xdp_rxq_info_detach_mem_model(struct xdp_rxq_info *xdp_rxq)
{
        xdp_rxq->mem = (struct xdp_mem_info){ };
}

/* Drivers not supporting XDP metadata can use this helper, which
 * rejects any room expansion for metadata as a result.
 */
static __always_inline void
xdp_set_data_meta_invalid(struct xdp_buff *xdp)
{
        xdp->data_meta = xdp->data + 1;
}

static __always_inline bool
xdp_data_meta_unsupported(const struct xdp_buff *xdp)
{
        return unlikely(xdp->data_meta > xdp->data);
}

static inline bool xdp_metalen_invalid(unsigned long metalen)
{
        unsigned long meta_max;

        meta_max = type_max(typeof_member(struct skb_shared_info, meta_len));
        BUILD_BUG_ON(!__builtin_constant_p(meta_max));

        return !IS_ALIGNED(metalen, sizeof(u32)) || metalen > meta_max;
}

struct xdp_attachment_info {
        struct bpf_prog *prog;
        u32 flags;
};

struct netdev_bpf;
void xdp_attachment_setup(struct xdp_attachment_info *info,
                          struct netdev_bpf *bpf);

#define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE

/* Define the relationship between xdp-rx-metadata kfunc and
 * various other entities:
 * - xdp_rx_metadata enum
 * - netdev netlink enum (Documentation/netlink/specs/netdev.yaml)
 * - kfunc name
 * - xdp_metadata_ops field
 */
#define XDP_METADATA_KFUNC_xxx  \
        XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \
                           NETDEV_XDP_RX_METADATA_TIMESTAMP, \
                           bpf_xdp_metadata_rx_timestamp, \
                           xmo_rx_timestamp) \
        XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
                           NETDEV_XDP_RX_METADATA_HASH, \
                           bpf_xdp_metadata_rx_hash, \
                           xmo_rx_hash) \
        XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
                           NETDEV_XDP_RX_METADATA_VLAN_TAG, \
                           bpf_xdp_metadata_rx_vlan_tag, \
                           xmo_rx_vlan_tag) \

enum xdp_rx_metadata {
#define XDP_METADATA_KFUNC(name, _, __, ___) name,
XDP_METADATA_KFUNC_xxx
#undef XDP_METADATA_KFUNC
MAX_XDP_METADATA_KFUNC,
};

enum xdp_rss_hash_type {
        /* First part: Individual bits for L3/L4 types */
        XDP_RSS_L3_IPV4         = BIT(0),
        XDP_RSS_L3_IPV6         = BIT(1),

        /* The fixed (L3) IPv4 and IPv6 headers can both be followed by
         * variable/dynamic headers, IPv4 called Options and IPv6 called
         * Extension Headers. HW RSS type can contain this info.
         */
        XDP_RSS_L3_DYNHDR       = BIT(2),

        /* When RSS hash covers L4 then drivers MUST set XDP_RSS_L4 bit in
         * addition to the protocol specific bit.  This ease interaction with
         * SKBs and avoids reserving a fixed mask for future L4 protocol bits.
         */
        XDP_RSS_L4              = BIT(3), /* L4 based hash, proto can be unknown */
        XDP_RSS_L4_TCP          = BIT(4),
        XDP_RSS_L4_UDP          = BIT(5),
        XDP_RSS_L4_SCTP         = BIT(6),
        XDP_RSS_L4_IPSEC        = BIT(7), /* L4 based hash include IPSEC SPI */
        XDP_RSS_L4_ICMP         = BIT(8),

        /* Second part: RSS hash type combinations used for driver HW mapping */
        XDP_RSS_TYPE_NONE            = 0,
        XDP_RSS_TYPE_L2              = XDP_RSS_TYPE_NONE,

        XDP_RSS_TYPE_L3_IPV4         = XDP_RSS_L3_IPV4,
        XDP_RSS_TYPE_L3_IPV6         = XDP_RSS_L3_IPV6,
        XDP_RSS_TYPE_L3_IPV4_OPT     = XDP_RSS_L3_IPV4 | XDP_RSS_L3_DYNHDR,
        XDP_RSS_TYPE_L3_IPV6_EX      = XDP_RSS_L3_IPV6 | XDP_RSS_L3_DYNHDR,

        XDP_RSS_TYPE_L4_ANY          = XDP_RSS_L4,
        XDP_RSS_TYPE_L4_IPV4_TCP     = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_TCP,
        XDP_RSS_TYPE_L4_IPV4_UDP     = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
        XDP_RSS_TYPE_L4_IPV4_SCTP    = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
        XDP_RSS_TYPE_L4_IPV4_IPSEC   = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
        XDP_RSS_TYPE_L4_IPV4_ICMP    = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_ICMP,

        XDP_RSS_TYPE_L4_IPV6_TCP     = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_TCP,
        XDP_RSS_TYPE_L4_IPV6_UDP     = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
        XDP_RSS_TYPE_L4_IPV6_SCTP    = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
        XDP_RSS_TYPE_L4_IPV6_IPSEC   = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
        XDP_RSS_TYPE_L4_IPV6_ICMP    = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_ICMP,

        XDP_RSS_TYPE_L4_IPV6_TCP_EX  = XDP_RSS_TYPE_L4_IPV6_TCP  | XDP_RSS_L3_DYNHDR,
        XDP_RSS_TYPE_L4_IPV6_UDP_EX  = XDP_RSS_TYPE_L4_IPV6_UDP  | XDP_RSS_L3_DYNHDR,
        XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
};

struct xdp_metadata_ops {
        int     (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp);
        int     (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash,
                               enum xdp_rss_hash_type *rss_type);
        int     (*xmo_rx_vlan_tag)(const struct xdp_md *ctx, __be16 *vlan_proto,
                                   u16 *vlan_tci);
};

#ifdef CONFIG_NET
u32 bpf_xdp_metadata_kfunc_id(int id);
bool bpf_dev_bound_kfunc_id(u32 btf_id);
void xdp_set_features_flag(struct net_device *dev, xdp_features_t val);
void xdp_set_features_flag_locked(struct net_device *dev, xdp_features_t val);
void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg);
void xdp_features_set_redirect_target_locked(struct net_device *dev,
                                             bool support_sg);
void xdp_features_clear_redirect_target(struct net_device *dev);
void xdp_features_clear_redirect_target_locked(struct net_device *dev);
#else
static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; }
static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; }

static inline void
xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
{
}

static inline void
xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
{
}

static inline void
xdp_features_clear_redirect_target(struct net_device *dev)
{
}
#endif

static inline void xdp_clear_features_flag(struct net_device *dev)
{
        xdp_set_features_flag(dev, 0);
}

static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
                                            struct xdp_buff *xdp)
{
        /* Driver XDP hooks are invoked within a single NAPI poll cycle and thus
         * under local_bh_disable(), which provides the needed RCU protection
         * for accessing map entries.
         */
        u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp));

        if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) {
                if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev))
                        act = xdp_master_redirect(xdp);
        }

        return act;
}
#endif /* __LINUX_NET_XDP_H__ */