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 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _RDS_RDS_H
 #define _RDS_RDS_H
 
 #include <net/sock.h>
 #include <linux/scatterlist.h>
 #include <linux/highmem.h>
 #include <rdma/rdma_cm.h>
 #include <linux/mutex.h>
 #include <linux/rds.h>
 #include <linux/rhashtable.h>
 #include <linux/refcount.h>
 #include <linux/in6.h>
 
 #include "info.h"
 
 /*
  * RDS Network protocol version
  */
 #define RDS_PROTOCOL_3_0    0x0300
 #define RDS_PROTOCOL_3_1    0x0301
 #define RDS_PROTOCOL_4_0    0x0400
 #define RDS_PROTOCOL_4_1    0x0401
 #define RDS_PROTOCOL_VERSION    RDS_PROTOCOL_3_1
 #define RDS_PROTOCOL_MAJOR(v)   ((v) >> 8)
 #define RDS_PROTOCOL_MINOR(v)   ((v) & 255)
 #define RDS_PROTOCOL(maj, min)  (((maj) << 8) | min)
 #define RDS_PROTOCOL_COMPAT_VERSION RDS_PROTOCOL_3_1
 
 /* The following ports, 16385, 18634, 18635, are registered with IANA as
  * the ports to be used for RDS over TCP and UDP.  Currently, only RDS over
  * TCP and RDS over IB/RDMA are implemented.  18634 is the historical value
  * used for the RDMA_CM listener port.  RDS/TCP uses port 16385.  After
  * IPv6 work, RDMA_CM also uses 16385 as the listener port.  18634 is kept
  * to ensure compatibility with older RDS modules.  Those ports are defined
  * in each transport's header file.
  */
 #define RDS_PORT    18634
 
 #ifdef ATOMIC64_INIT
 #define KERNEL_HAS_ATOMIC64
 #endif
 #ifdef RDS_DEBUG
 #define rdsdebug(fmt, args...) pr_debug("%s(): " fmt, __func__ , ##args)
 #else
 /* sigh, pr_debug() causes unused variable warnings */
 static inline __printf(1, 2)
 void rdsdebug(char *fmt, ...)
 {
 }
 #endif
 
 #define RDS_FRAG_SHIFT  12
 #define RDS_FRAG_SIZE   ((unsigned int)(1 << RDS_FRAG_SHIFT))
 
 /* Used to limit both RDMA and non-RDMA RDS message to 1MB */
 #define RDS_MAX_MSG_SIZE    ((unsigned int)(1 << 20))
 
 #define RDS_CONG_MAP_BYTES  (65536 / 8)
 #define RDS_CONG_MAP_PAGES  (PAGE_ALIGN(RDS_CONG_MAP_BYTES) / PAGE_SIZE)
 #define RDS_CONG_MAP_PAGE_BITS  (PAGE_SIZE * 8)
 
 struct rds_cong_map {
     struct rb_node      m_rb_node;
     struct in6_addr     m_addr;
     wait_queue_head_t   m_waitq;
     struct list_head    m_conn_list;
     unsigned long       m_page_addrs[RDS_CONG_MAP_PAGES];
 };
 
 
 /*
  * This is how we will track the connection state:
  * A connection is always in one of the following
  * states. Updates to the state are atomic and imply
  * a memory barrier.
  */
 enum {
     RDS_CONN_DOWN = 0,
     RDS_CONN_CONNECTING,
     RDS_CONN_DISCONNECTING,
     RDS_CONN_UP,
     RDS_CONN_RESETTING,
     RDS_CONN_ERROR,
 };
 
 /* Bits for c_flags */
 #define RDS_LL_SEND_FULL    0
 #define RDS_RECONNECT_PENDING   1
 #define RDS_IN_XMIT     2
 #define RDS_RECV_REFILL     3
 #define RDS_DESTROY_PENDING 4
 
 /* Max number of multipaths per RDS connection. Must be a power of 2 */
 #define RDS_MPATH_WORKERS   8
 #define RDS_MPATH_HASH(rs, n) (jhash_1word((rs)->rs_bound_port, \
                    (rs)->rs_hash_initval) & ((n) - 1))
 
 #define IS_CANONICAL(laddr, faddr) (htonl(laddr) < htonl(faddr))
 
 /* Per mpath connection state */
 struct rds_conn_path {
     struct rds_connection   *cp_conn;
     struct rds_message  *cp_xmit_rm;
     unsigned long       cp_xmit_sg;
     unsigned int        cp_xmit_hdr_off;
     unsigned int        cp_xmit_data_off;
     unsigned int        cp_xmit_atomic_sent;
     unsigned int        cp_xmit_rdma_sent;
     unsigned int        cp_xmit_data_sent;
 
     spinlock_t      cp_lock;        /* protect msg queues */
     u64         cp_next_tx_seq;
     struct list_head    cp_send_queue;
     struct list_head    cp_retrans;
 
     u64         cp_next_rx_seq;
 
     void            *cp_transport_data;
 
     atomic_t        cp_state;
     unsigned long       cp_send_gen;
     unsigned long       cp_flags;
     unsigned long       cp_reconnect_jiffies;
     struct delayed_work cp_send_w;
     struct delayed_work cp_recv_w;
     struct delayed_work cp_conn_w;
     struct work_struct  cp_down_w;
     struct mutex        cp_cm_lock; /* protect cp_state & cm */
     wait_queue_head_t   cp_waitq;
 
     unsigned int        cp_unacked_packets;
     unsigned int        cp_unacked_bytes;
     unsigned int        cp_index;
 };
 
 /* One rds_connection per RDS address pair */
 struct rds_connection {
     struct hlist_node   c_hash_node;
     struct in6_addr     c_laddr;
     struct in6_addr     c_faddr;
     int         c_dev_if; /* ifindex used for this conn */
     int         c_bound_if; /* ifindex of c_laddr */
     unsigned int        c_loopback:1,
                 c_isv6:1,
                 c_ping_triggered:1,
                 c_pad_to_32:29;
     int         c_npaths;
     struct rds_connection   *c_passive;
     struct rds_transport    *c_trans;
 
     struct rds_cong_map *c_lcong;
     struct rds_cong_map *c_fcong;
 
     /* Protocol version */
     unsigned int        c_proposed_version;
     unsigned int        c_version;
     possible_net_t      c_net;
 
     /* TOS */
     u8          c_tos;
 
     struct list_head    c_map_item;
     unsigned long       c_map_queued;
 
     struct rds_conn_path    *c_path;
     wait_queue_head_t   c_hs_waitq; /* handshake waitq */
 
     u32         c_my_gen_num;
     u32         c_peer_gen_num;
 };
 
 static inline
 struct net *rds_conn_net(struct rds_connection *conn)
 {
     return read_pnet(&conn->c_net);
 }
 
 static inline
 void rds_conn_net_set(struct rds_connection *conn, struct net *net)
 {
     write_pnet(&conn->c_net, net);
 }
 
 #define RDS_FLAG_CONG_BITMAP    0x01
 #define RDS_FLAG_ACK_REQUIRED   0x02
 #define RDS_FLAG_RETRANSMITTED  0x04
 #define RDS_MAX_ADV_CREDIT  255
 
 /* RDS_FLAG_PROBE_PORT is the reserved sport used for sending a ping
  * probe to exchange control information before establishing a connection.
  * Currently the control information that is exchanged is the number of
  * supported paths. If the peer is a legacy (older kernel revision) peer,
  * it would return a pong message without additional control information
  * that would then alert the sender that the peer was an older rev.
  */
 #define RDS_FLAG_PROBE_PORT 1
 #define RDS_HS_PROBE(sport, dport) \
         ((sport == RDS_FLAG_PROBE_PORT && dport == 0) || \
          (sport == 0 && dport == RDS_FLAG_PROBE_PORT))
 /*
  * Maximum space available for extension headers.
  */
 #define RDS_HEADER_EXT_SPACE    16
 
 struct rds_header {
     __be64  h_sequence;
     __be64  h_ack;
     __be32  h_len;
     __be16  h_sport;
     __be16  h_dport;
     u8  h_flags;
     u8  h_credit;
     u8  h_padding[4];
     __sum16 h_csum;
 
     u8  h_exthdr[RDS_HEADER_EXT_SPACE];
 };
 
 /*
  * Reserved - indicates end of extensions
  */
 #define RDS_EXTHDR_NONE     0
 
 /*
  * This extension header is included in the very
  * first message that is sent on a new connection,
  * and identifies the protocol level. This will help
  * rolling updates if a future change requires breaking
  * the protocol.
  * NB: This is no longer true for IB, where we do a version
  * negotiation during the connection setup phase (protocol
  * version information is included in the RDMA CM private data).
  */
 #define RDS_EXTHDR_VERSION  1
 struct rds_ext_header_version {
     __be32          h_version;
 };
 
 /*
  * This extension header is included in the RDS message
  * chasing an RDMA operation.
  */
 #define RDS_EXTHDR_RDMA     2
 struct rds_ext_header_rdma {
     __be32          h_rdma_rkey;
 };
 
 /*
  * This extension header tells the peer about the
  * destination <R_Key,offset> of the requested RDMA
  * operation.
  */
 #define RDS_EXTHDR_RDMA_DEST    3
 struct rds_ext_header_rdma_dest {
     __be32          h_rdma_rkey;
     __be32          h_rdma_offset;
 };
 
 /* Extension header announcing number of paths.
  * Implicit length = 2 bytes.
  */
 #define RDS_EXTHDR_NPATHS   5
 #define RDS_EXTHDR_GEN_NUM  6
 
 #define __RDS_EXTHDR_MAX    16 /* for now */
 #define RDS_RX_MAX_TRACES   (RDS_MSG_RX_DGRAM_TRACE_MAX + 1)
 #define RDS_MSG_RX_HDR      0
 #define RDS_MSG_RX_START    1
 #define RDS_MSG_RX_END      2
 #define RDS_MSG_RX_CMSG     3
 
 /* The following values are whitelisted for usercopy */
 struct rds_inc_usercopy {
     rds_rdma_cookie_t   rdma_cookie;
     ktime_t         rx_tstamp;
 };
 
 struct rds_incoming {
     refcount_t      i_refcount;
     struct list_head    i_item;
     struct rds_connection   *i_conn;
     struct rds_conn_path    *i_conn_path;
     struct rds_header   i_hdr;
     unsigned long       i_rx_jiffies;
     struct in6_addr     i_saddr;
 
     struct rds_inc_usercopy i_usercopy;
     u64         i_rx_lat_trace[RDS_RX_MAX_TRACES];
 };
 
 struct rds_mr {
     struct rb_node      r_rb_node;
     struct kref     r_kref;
     u32         r_key;
 
     /* A copy of the creation flags */
     unsigned int        r_use_once:1;
     unsigned int        r_invalidate:1;
     unsigned int        r_write:1;
 
     struct rds_sock     *r_sock; /* back pointer to the socket that owns us */
     struct rds_transport    *r_trans;
     void            *r_trans_private;
 };
 
 static inline rds_rdma_cookie_t rds_rdma_make_cookie(u32 r_key, u32 offset)
 {
     return r_key | (((u64) offset) << 32);
 }
 
 static inline u32 rds_rdma_cookie_key(rds_rdma_cookie_t cookie)
 {
     return cookie;
 }
 
 static inline u32 rds_rdma_cookie_offset(rds_rdma_cookie_t cookie)
 {
     return cookie >> 32;
 }
 
 /* atomic operation types */
 #define RDS_ATOMIC_TYPE_CSWP        0
 #define RDS_ATOMIC_TYPE_FADD        1
 
 /*
  * m_sock_item and m_conn_item are on lists that are serialized under
  * conn->c_lock.  m_sock_item has additional meaning in that once it is empty
  * the message will not be put back on the retransmit list after being sent.
  * messages that are canceled while being sent rely on this.
  *
  * m_inc is used by loopback so that it can pass an incoming message straight
  * back up into the rx path.  It embeds a wire header which is also used by
  * the send path, which is kind of awkward.
  *
  * m_sock_item indicates the message's presence on a socket's send or receive
  * queue.  m_rs will point to that socket.
  *
  * m_daddr is used by cancellation to prune messages to a given destination.
  *
  * The RDS_MSG_ON_SOCK and RDS_MSG_ON_CONN flags are used to avoid lock
  * nesting.  As paths iterate over messages on a sock, or conn, they must
  * also lock the conn, or sock, to remove the message from those lists too.
  * Testing the flag to determine if the message is still on the lists lets
  * us avoid testing the list_head directly.  That means each path can use
  * the message's list_head to keep it on a local list while juggling locks
  * without confusing the other path.
  *
  * m_ack_seq is an optional field set by transports who need a different
  * sequence number range to invalidate.  They can use this in a callback
  * that they pass to rds_send_drop_acked() to see if each message has been
  * acked.  The HAS_ACK_SEQ flag can be used to detect messages which haven't
  * had ack_seq set yet.
  */
 #define RDS_MSG_ON_SOCK     1
 #define RDS_MSG_ON_CONN     2
 #define RDS_MSG_HAS_ACK_SEQ 3
 #define RDS_MSG_ACK_REQUIRED    4
 #define RDS_MSG_RETRANSMITTED   5
 #define RDS_MSG_MAPPED      6
 #define RDS_MSG_PAGEVEC     7
 #define RDS_MSG_FLUSH       8
 
 struct rds_znotifier {
     struct mmpin        z_mmp;
     u32         z_cookie;
 };
 
 struct rds_msg_zcopy_info {
     struct list_head rs_zcookie_next;
     union {
         struct rds_znotifier znotif;
         struct rds_zcopy_cookies zcookies;
     };
 };
 
 struct rds_msg_zcopy_queue {
     struct list_head zcookie_head;
     spinlock_t lock; /* protects zcookie_head queue */
 };
 
 static inline void rds_message_zcopy_queue_init(struct rds_msg_zcopy_queue *q)
 {
     spin_lock_init(&q->lock);
     INIT_LIST_HEAD(&q->zcookie_head);
 }
 
 struct rds_iov_vector {
     struct rds_iovec *iov;
     int               len;
 };
 
 struct rds_iov_vector_arr {
     struct rds_iov_vector *vec;
     int                    len;
     int                    indx;
     int                    incr;
 };
 
 struct rds_message {
     refcount_t      m_refcount;
     struct list_head    m_sock_item;
     struct list_head    m_conn_item;
     struct rds_incoming m_inc;
     u64         m_ack_seq;
     struct in6_addr     m_daddr;
     unsigned long       m_flags;
 
     /* Never access m_rs without holding m_rs_lock.
      * Lock nesting is
      *  rm->m_rs_lock
      *   -> rs->rs_lock
      */
     spinlock_t      m_rs_lock;
     wait_queue_head_t   m_flush_wait;
 
     struct rds_sock     *m_rs;
 
     /* cookie to send to remote, in rds header */
     rds_rdma_cookie_t   m_rdma_cookie;
 
     unsigned int        m_used_sgs;
     unsigned int        m_total_sgs;
 
     void            *m_final_op;
 
     struct {
         struct rm_atomic_op {
             int         op_type;
             union {
                 struct {
                     uint64_t    compare;
                     uint64_t    swap;
                     uint64_t    compare_mask;
                     uint64_t    swap_mask;
                 } op_m_cswp;
                 struct {
                     uint64_t    add;
                     uint64_t    nocarry_mask;
                 } op_m_fadd;
             };
 
             u32         op_rkey;
             u64         op_remote_addr;
             unsigned int        op_notify:1;
             unsigned int        op_recverr:1;
             unsigned int        op_mapped:1;
             unsigned int        op_silent:1;
             unsigned int        op_active:1;
             struct scatterlist  *op_sg;
             struct rds_notifier *op_notifier;
 
             struct rds_mr       *op_rdma_mr;
         } atomic;
         struct rm_rdma_op {
             u32         op_rkey;
             u64         op_remote_addr;
             unsigned int        op_write:1;
             unsigned int        op_fence:1;
             unsigned int        op_notify:1;
             unsigned int        op_recverr:1;
             unsigned int        op_mapped:1;
             unsigned int        op_silent:1;
             unsigned int        op_active:1;
             unsigned int        op_bytes;
             unsigned int        op_nents;
             unsigned int        op_count;
             struct scatterlist  *op_sg;
             struct rds_notifier *op_notifier;
 
             struct rds_mr       *op_rdma_mr;
 
             u64         op_odp_addr;
             struct rds_mr       *op_odp_mr;
         } rdma;
         struct rm_data_op {
             unsigned int        op_active:1;
             unsigned int        op_nents;
             unsigned int        op_count;
             unsigned int        op_dmasg;
             unsigned int        op_dmaoff;
             struct rds_znotifier    *op_mmp_znotifier;
             struct scatterlist  *op_sg;
         } data;
     };
 
     struct rds_conn_path *m_conn_path;
 };
 
 /*
  * The RDS notifier is used (optionally) to tell the application about
  * completed RDMA operations. Rather than keeping the whole rds message
  * around on the queue, we allocate a small notifier that is put on the
  * socket's notifier_list. Notifications are delivered to the application
  * through control messages.
  */
 struct rds_notifier {
     struct list_head    n_list;
     uint64_t        n_user_token;
     int         n_status;
 };
 
 /* Available as part of RDS core, so doesn't need to participate
  * in get_preferred transport etc
  */
 #define RDS_TRANS_LOOP  3
 
 /**
  * struct rds_transport -  transport specific behavioural hooks
  *
  * @xmit: .xmit is called by rds_send_xmit() to tell the transport to send
  *        part of a message.  The caller serializes on the send_sem so this
  *        doesn't need to be reentrant for a given conn.  The header must be
  *        sent before the data payload.  .xmit must be prepared to send a
  *        message with no data payload.  .xmit should return the number of
  *        bytes that were sent down the connection, including header bytes.
  *        Returning 0 tells the caller that it doesn't need to perform any
  *        additional work now.  This is usually the case when the transport has
  *        filled the sending queue for its connection and will handle
  *        triggering the rds thread to continue the send when space becomes
  *        available.  Returning -EAGAIN tells the caller to retry the send
  *        immediately.  Returning -ENOMEM tells the caller to retry the send at
  *        some point in the future.
  *
  * @conn_shutdown: conn_shutdown stops traffic on the given connection.  Once
  *                 it returns the connection can not call rds_recv_incoming().
  *                 This will only be called once after conn_connect returns
  *                 non-zero success and will The caller serializes this with
  *                 the send and connecting paths (xmit_* and conn_*).  The
  *                 transport is responsible for other serialization, including
  *                 rds_recv_incoming().  This is called in process context but
  *                 should try hard not to block.
  */
 
 struct rds_transport {
     char            t_name[TRANSNAMSIZ];
     struct list_head    t_item;
     struct module       *t_owner;
     unsigned int        t_prefer_loopback:1,
                 t_mp_capable:1;
     unsigned int        t_type;
 
     int (*laddr_check)(struct net *net, const struct in6_addr *addr,
                __u32 scope_id);
     int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);
     void (*conn_free)(void *data);
     int (*conn_path_connect)(struct rds_conn_path *cp);
     void (*conn_path_shutdown)(struct rds_conn_path *conn);
     void (*xmit_path_prepare)(struct rds_conn_path *cp);
     void (*xmit_path_complete)(struct rds_conn_path *cp);
     int (*xmit)(struct rds_connection *conn, struct rds_message *rm,
             unsigned int hdr_off, unsigned int sg, unsigned int off);
     int (*xmit_rdma)(struct rds_connection *conn, struct rm_rdma_op *op);
     int (*xmit_atomic)(struct rds_connection *conn, struct rm_atomic_op *op);
     int (*recv_path)(struct rds_conn_path *cp);
     int (*inc_copy_to_user)(struct rds_incoming *inc, struct iov_iter *to);
     void (*inc_free)(struct rds_incoming *inc);
 
     int (*cm_handle_connect)(struct rdma_cm_id *cm_id,
                  struct rdma_cm_event *event, bool isv6);
     int (*cm_initiate_connect)(struct rdma_cm_id *cm_id, bool isv6);
     void (*cm_connect_complete)(struct rds_connection *conn,
                     struct rdma_cm_event *event);
 
     unsigned int (*stats_info_copy)(struct rds_info_iterator *iter,
                     unsigned int avail);
     void (*exit)(void);
     void *(*get_mr)(struct scatterlist *sg, unsigned long nr_sg,
             struct rds_sock *rs, u32 *key_ret,
             struct rds_connection *conn,
             u64 start, u64 length, int need_odp);
     void (*sync_mr)(void *trans_private, int direction);
     void (*free_mr)(void *trans_private, int invalidate);
     void (*flush_mrs)(void);
     bool (*t_unloading)(struct rds_connection *conn);
     u8 (*get_tos_map)(u8 tos);
 };
 
 /* Bind hash table key length.  It is the sum of the size of a struct
  * in6_addr, a scope_id  and a port.
  */
 #define RDS_BOUND_KEY_LEN \
     (sizeof(struct in6_addr) + sizeof(__u32) + sizeof(__be16))
 
 struct rds_sock {
     struct sock     rs_sk;
 
     u64         rs_user_addr;
     u64         rs_user_bytes;
 
     /*
      * bound_addr used for both incoming and outgoing, no INADDR_ANY
      * support.
      */
     struct rhash_head   rs_bound_node;
     u8          rs_bound_key[RDS_BOUND_KEY_LEN];
     struct sockaddr_in6 rs_bound_sin6;
 #define rs_bound_addr       rs_bound_sin6.sin6_addr
 #define rs_bound_addr_v4    rs_bound_sin6.sin6_addr.s6_addr32[3]
 #define rs_bound_port       rs_bound_sin6.sin6_port
 #define rs_bound_scope_id   rs_bound_sin6.sin6_scope_id
     struct in6_addr     rs_conn_addr;
 #define rs_conn_addr_v4     rs_conn_addr.s6_addr32[3]
     __be16          rs_conn_port;
     struct rds_transport    *rs_transport;
 
     /*
      * rds_sendmsg caches the conn it used the last time around.
      * This helps avoid costly lookups.
      */
     struct rds_connection   *rs_conn;
 
     /* flag indicating we were congested or not */
     int         rs_congested;
     /* seen congestion (ENOBUFS) when sending? */
     int         rs_seen_congestion;
 
     /* rs_lock protects all these adjacent members before the newline */
     spinlock_t      rs_lock;
     struct list_head    rs_send_queue;
     u32         rs_snd_bytes;
     int         rs_rcv_bytes;
     struct list_head    rs_notify_queue;    /* currently used for failed RDMAs */
 
     /* Congestion wake_up. If rs_cong_monitor is set, we use cong_mask
      * to decide whether the application should be woken up.
      * If not set, we use rs_cong_track to find out whether a cong map
      * update arrived.
      */
     uint64_t        rs_cong_mask;
     uint64_t        rs_cong_notify;
     struct list_head    rs_cong_list;
     unsigned long       rs_cong_track;
 
     /*
      * rs_recv_lock protects the receive queue, and is
      * used to serialize with rds_release.
      */
     rwlock_t        rs_recv_lock;
     struct list_head    rs_recv_queue;
 
     /* just for stats reporting */
     struct list_head    rs_item;
 
     /* these have their own lock */
     spinlock_t      rs_rdma_lock;
     struct rb_root      rs_rdma_keys;
 
     /* Socket options - in case there will be more */
     unsigned char       rs_recverr,
                 rs_cong_monitor;
     u32         rs_hash_initval;
 
     /* Socket receive path trace points*/
     u8          rs_rx_traces;
     u8          rs_rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
     struct rds_msg_zcopy_queue rs_zcookie_queue;
     u8          rs_tos;
 };
 
 static inline struct rds_sock *rds_sk_to_rs(const struct sock *sk)
 {
     return container_of(sk, struct rds_sock, rs_sk);
 }
 static inline struct sock *rds_rs_to_sk(struct rds_sock *rs)
 {
     return &rs->rs_sk;
 }
 
 /*
  * The stack assigns sk_sndbuf and sk_rcvbuf to twice the specified value
  * to account for overhead.  We don't account for overhead, we just apply
  * the number of payload bytes to the specified value.
  */
 static inline int rds_sk_sndbuf(struct rds_sock *rs)
 {
     return rds_rs_to_sk(rs)->sk_sndbuf / 2;
 }
 static inline int rds_sk_rcvbuf(struct rds_sock *rs)
 {
     return rds_rs_to_sk(rs)->sk_rcvbuf / 2;
 }
 
 struct rds_statistics {
     uint64_t    s_conn_reset;
     uint64_t    s_recv_drop_bad_checksum;
     uint64_t    s_recv_drop_old_seq;
     uint64_t    s_recv_drop_no_sock;
     uint64_t    s_recv_drop_dead_sock;
     uint64_t    s_recv_deliver_raced;
     uint64_t    s_recv_delivered;
     uint64_t    s_recv_queued;
     uint64_t    s_recv_immediate_retry;
     uint64_t    s_recv_delayed_retry;
     uint64_t    s_recv_ack_required;
     uint64_t    s_recv_rdma_bytes;
     uint64_t    s_recv_ping;
     uint64_t    s_send_queue_empty;
     uint64_t    s_send_queue_full;
     uint64_t    s_send_lock_contention;
     uint64_t    s_send_lock_queue_raced;
     uint64_t    s_send_immediate_retry;
     uint64_t    s_send_delayed_retry;
     uint64_t    s_send_drop_acked;
     uint64_t    s_send_ack_required;
     uint64_t    s_send_queued;
     uint64_t    s_send_rdma;
     uint64_t    s_send_rdma_bytes;
     uint64_t    s_send_pong;
     uint64_t    s_page_remainder_hit;
     uint64_t    s_page_remainder_miss;
     uint64_t    s_copy_to_user;
     uint64_t    s_copy_from_user;
     uint64_t    s_cong_update_queued;
     uint64_t    s_cong_update_received;
     uint64_t    s_cong_send_error;
     uint64_t    s_cong_send_blocked;
     uint64_t    s_recv_bytes_added_to_socket;
     uint64_t    s_recv_bytes_removed_from_socket;
     uint64_t    s_send_stuck_rm;
 };
 
 /* af_rds.c */
 void rds_sock_addref(struct rds_sock *rs);
 void rds_sock_put(struct rds_sock *rs);
 void rds_wake_sk_sleep(struct rds_sock *rs);
 static inline void __rds_wake_sk_sleep(struct sock *sk)
 {
     wait_queue_head_t *waitq = sk_sleep(sk);
 
     if (!sock_flag(sk, SOCK_DEAD) && waitq)
         wake_up(waitq);
 }
 extern wait_queue_head_t rds_poll_waitq;
 
 
 /* bind.c */
 int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
 void rds_remove_bound(struct rds_sock *rs);
 struct rds_sock *rds_find_bound(const struct in6_addr *addr, __be16 port,
                 __u32 scope_id);
 int rds_bind_lock_init(void);
 void rds_bind_lock_destroy(void);
 
 /* cong.c */
 int rds_cong_get_maps(struct rds_connection *conn);
 void rds_cong_add_conn(struct rds_connection *conn);
 void rds_cong_remove_conn(struct rds_connection *conn);
 void rds_cong_set_bit(struct rds_cong_map *map, __be16 port);
 void rds_cong_clear_bit(struct rds_cong_map *map, __be16 port);
 int rds_cong_wait(struct rds_cong_map *map, __be16 port, int nonblock, struct rds_sock *rs);
 void rds_cong_queue_updates(struct rds_cong_map *map);
 void rds_cong_map_updated(struct rds_cong_map *map, uint64_t);
 int rds_cong_updated_since(unsigned long *recent);
 void rds_cong_add_socket(struct rds_sock *);
 void rds_cong_remove_socket(struct rds_sock *);
 void rds_cong_exit(void);
 struct rds_message *rds_cong_update_alloc(struct rds_connection *conn);
 
 /* connection.c */
 extern u32 rds_gen_num;
 int rds_conn_init(void);
 void rds_conn_exit(void);
 struct rds_connection *rds_conn_create(struct net *net,
                        const struct in6_addr *laddr,
                        const struct in6_addr *faddr,
                        struct rds_transport *trans,
                        u8 tos, gfp_t gfp,
                        int dev_if);
 struct rds_connection *rds_conn_create_outgoing(struct net *net,
                         const struct in6_addr *laddr,
                         const struct in6_addr *faddr,
                         struct rds_transport *trans,
                         u8 tos, gfp_t gfp, int dev_if);
 void rds_conn_shutdown(struct rds_conn_path *cpath);
 void rds_conn_destroy(struct rds_connection *conn);
 void rds_conn_drop(struct rds_connection *conn);
 void rds_conn_path_drop(struct rds_conn_path *cpath, bool destroy);
 void rds_conn_connect_if_down(struct rds_connection *conn);
 void rds_conn_path_connect_if_down(struct rds_conn_path *cp);
 void rds_check_all_paths(struct rds_connection *conn);
 void rds_for_each_conn_info(struct socket *sock, unsigned int len,
               struct rds_info_iterator *iter,
               struct rds_info_lengths *lens,
               int (*visitor)(struct rds_connection *, void *),
               u64 *buffer,
               size_t item_len);
 
 __printf(2, 3)
 void __rds_conn_path_error(struct rds_conn_path *cp, const char *, ...);
 #define rds_conn_path_error(cp, fmt...) \
     __rds_conn_path_error(cp, KERN_WARNING "RDS: " fmt)
 
 static inline int
 rds_conn_path_transition(struct rds_conn_path *cp, int old, int new)
 {
     return atomic_cmpxchg(&cp->cp_state, old, new) == old;
 }
 
 static inline int
 rds_conn_transition(struct rds_connection *conn, int old, int new)
 {
     WARN_ON(conn->c_trans->t_mp_capable);
     return rds_conn_path_transition(&conn->c_path[0], old, new);
 }
 
 static inline int
 rds_conn_path_state(struct rds_conn_path *cp)
 {
     return atomic_read(&cp->cp_state);
 }
 
 static inline int
 rds_conn_state(struct rds_connection *conn)
 {
     WARN_ON(conn->c_trans->t_mp_capable);
     return rds_conn_path_state(&conn->c_path[0]);
 }
 
 static inline int
 rds_conn_path_up(struct rds_conn_path *cp)
 {
     return atomic_read(&cp->cp_state) == RDS_CONN_UP;
 }
 
 static inline int
 rds_conn_path_down(struct rds_conn_path *cp)
 {
     return atomic_read(&cp->cp_state) == RDS_CONN_DOWN;
 }
 
 static inline int
 rds_conn_up(struct rds_connection *conn)
 {
     WARN_ON(conn->c_trans->t_mp_capable);
     return rds_conn_path_up(&conn->c_path[0]);
 }
 
 static inline int
 rds_conn_path_connecting(struct rds_conn_path *cp)
 {
     return atomic_read(&cp->cp_state) == RDS_CONN_CONNECTING;
 }
 
 static inline int
 rds_conn_connecting(struct rds_connection *conn)
 {
     WARN_ON(conn->c_trans->t_mp_capable);
     return rds_conn_path_connecting(&conn->c_path[0]);
 }
 
 /* message.c */
 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
 struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,
                    bool zcopy);
 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);
 void rds_message_populate_header(struct rds_header *hdr, __be16 sport,
                  __be16 dport, u64 seq);
 int rds_message_add_extension(struct rds_header *hdr,
                   unsigned int type, const void *data, unsigned int len);
 int rds_message_next_extension(struct rds_header *hdr,
                    unsigned int *pos, void *buf, unsigned int *buflen);
 int rds_message_add_rdma_dest_extension(struct rds_header *hdr, u32 r_key, u32 offset);
 int rds_message_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 void rds_message_inc_free(struct rds_incoming *inc);
 void rds_message_addref(struct rds_message *rm);
 void rds_message_put(struct rds_message *rm);
 void rds_message_wait(struct rds_message *rm);
 void rds_message_unmapped(struct rds_message *rm);
 void rds_notify_msg_zcopy_purge(struct rds_msg_zcopy_queue *info);
 
 static inline void rds_message_make_checksum(struct rds_header *hdr)
 {
     hdr->h_csum = 0;
     hdr->h_csum = ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2);
 }
 
 static inline int rds_message_verify_checksum(const struct rds_header *hdr)
 {
     return !hdr->h_csum || ip_fast_csum((void *) hdr, sizeof(*hdr) >> 2) == 0;
 }
 
 
 /* page.c */
 int rds_page_remainder_alloc(struct scatterlist *scat, unsigned long bytes,
                  gfp_t gfp);
 void rds_page_exit(void);
 
 /* recv.c */
 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
           struct in6_addr *saddr);
 void rds_inc_path_init(struct rds_incoming *inc, struct rds_conn_path *conn,
                struct in6_addr *saddr);
 void rds_inc_put(struct rds_incoming *inc);
 void rds_recv_incoming(struct rds_connection *conn, struct in6_addr *saddr,
                struct in6_addr *daddr,
                struct rds_incoming *inc, gfp_t gfp);
 int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
         int msg_flags);
 void rds_clear_recv_queue(struct rds_sock *rs);
 int rds_notify_queue_get(struct rds_sock *rs, struct msghdr *msg);
 void rds_inc_info_copy(struct rds_incoming *inc,
                struct rds_info_iterator *iter,
                __be32 saddr, __be32 daddr, int flip);
 void rds6_inc_info_copy(struct rds_incoming *inc,
             struct rds_info_iterator *iter,
             struct in6_addr *saddr, struct in6_addr *daddr,
             int flip);
 
 /* send.c */
 int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len);
 void rds_send_path_reset(struct rds_conn_path *conn);
 int rds_send_xmit(struct rds_conn_path *cp);
 struct sockaddr_in;
 void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in6 *dest);
 typedef int (*is_acked_func)(struct rds_message *rm, uint64_t ack);
 void rds_send_drop_acked(struct rds_connection *conn, u64 ack,
              is_acked_func is_acked);
 void rds_send_path_drop_acked(struct rds_conn_path *cp, u64 ack,
                   is_acked_func is_acked);
 void rds_send_ping(struct rds_connection *conn, int cp_index);
 int rds_send_pong(struct rds_conn_path *cp, __be16 dport);
 
 /* rdma.c */
 void rds_rdma_unuse(struct rds_sock *rs, u32 r_key, int force);
 int rds_get_mr(struct rds_sock *rs, sockptr_t optval, int optlen);
 int rds_get_mr_for_dest(struct rds_sock *rs, sockptr_t optval, int optlen);
 int rds_free_mr(struct rds_sock *rs, sockptr_t optval, int optlen);
 void rds_rdma_drop_keys(struct rds_sock *rs);
 int rds_rdma_extra_size(struct rds_rdma_args *args,
             struct rds_iov_vector *iov);
 int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
               struct cmsghdr *cmsg);
 int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
               struct cmsghdr *cmsg,
               struct rds_iov_vector *vec);
 int rds_cmsg_rdma_map(struct rds_sock *rs, struct rds_message *rm,
               struct cmsghdr *cmsg);
 void rds_rdma_free_op(struct rm_rdma_op *ro);
 void rds_atomic_free_op(struct rm_atomic_op *ao);
 void rds_rdma_send_complete(struct rds_message *rm, int wc_status);
 void rds_atomic_send_complete(struct rds_message *rm, int wc_status);
 int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
             struct cmsghdr *cmsg);
 
 void __rds_put_mr_final(struct kref *kref);
 
 static inline bool rds_destroy_pending(struct rds_connection *conn)
 {
     return !check_net(rds_conn_net(conn)) ||
            (conn->c_trans->t_unloading && conn->c_trans->t_unloading(conn));
 }
 
 enum {
     ODP_NOT_NEEDED,
     ODP_ZEROBASED,
     ODP_VIRTUAL
 };
 
 /* stats.c */
 DECLARE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
 #define rds_stats_inc_which(which, member) do {     \
     per_cpu(which, get_cpu()).member++;     \
     put_cpu();                  \
 } while (0)
 #define rds_stats_inc(member) rds_stats_inc_which(rds_stats, member)
 #define rds_stats_add_which(which, member, count) do {      \
     per_cpu(which, get_cpu()).member += count;  \
     put_cpu();                  \
 } while (0)
 #define rds_stats_add(member, count) rds_stats_add_which(rds_stats, member, count)
 int rds_stats_init(void);
 void rds_stats_exit(void);
 void rds_stats_info_copy(struct rds_info_iterator *iter,
              uint64_t *values, const char *const *names,
              size_t nr);
 
 /* sysctl.c */
 int rds_sysctl_init(void);
 void rds_sysctl_exit(void);
 extern unsigned long rds_sysctl_sndbuf_min;
 extern unsigned long rds_sysctl_sndbuf_default;
 extern unsigned long rds_sysctl_sndbuf_max;
 extern unsigned long rds_sysctl_reconnect_min_jiffies;
 extern unsigned long rds_sysctl_reconnect_max_jiffies;
 extern unsigned int  rds_sysctl_max_unacked_packets;
 extern unsigned int  rds_sysctl_max_unacked_bytes;
 extern unsigned int  rds_sysctl_ping_enable;
 extern unsigned long rds_sysctl_trace_flags;
 extern unsigned int  rds_sysctl_trace_level;
 
 /* threads.c */
 int rds_threads_init(void);
 void rds_threads_exit(void);
 extern struct workqueue_struct *rds_wq;
 void rds_queue_reconnect(struct rds_conn_path *cp);
 void rds_connect_worker(struct work_struct *);
 void rds_shutdown_worker(struct work_struct *);
 void rds_send_worker(struct work_struct *);
 void rds_recv_worker(struct work_struct *);
 void rds_connect_path_complete(struct rds_conn_path *conn, int curr);
 void rds_connect_complete(struct rds_connection *conn);
 int rds_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2);
 
 /* transport.c */
 void rds_trans_register(struct rds_transport *trans);
 void rds_trans_unregister(struct rds_transport *trans);
 struct rds_transport *rds_trans_get_preferred(struct net *net,
                           const struct in6_addr *addr,
                           __u32 scope_id);
 void rds_trans_put(struct rds_transport *trans);
 unsigned int rds_trans_stats_info_copy(struct rds_info_iterator *iter,
                        unsigned int avail);
 struct rds_transport *rds_trans_get(int t_type);
 int rds_trans_init(void);
 void rds_trans_exit(void);
 
 #endif

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