v4.19.13 snapshot.
diff --git a/net/rds/rds.h b/net/rds/rds.h
new file mode 100644
index 0000000..c4dcf65
--- /dev/null
+++ b/net/rds/rds.h
@@ -0,0 +1,994 @@
+/* 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_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)
+
+/* 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
+
+/* XXX is there one of these somewhere? */
+#define ceil(x, y) \
+ ({ unsigned long __x = (x), __y = (y); (__x + __y - 1) / __y; })
+
+#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_version;
+ possible_net_t c_net;
+
+ 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
+
+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;
+
+ rds_rdma_cookie_t i_rdma_cookie;
+ struct timeval i_rx_tstamp;
+ u64 i_rx_lat_trace[RDS_RX_MAX_TRACES];
+};
+
+struct rds_mr {
+ struct rb_node r_rb_node;
+ refcount_t r_refcount;
+ 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;
+
+ /* This is for RDS_MR_DEAD.
+ * It would be nice & consistent to make this part of the above
+ * bit field here, but we need to use test_and_set_bit.
+ */
+ unsigned long r_state;
+ struct rds_sock *r_sock; /* back pointer to the socket that owns us */
+ struct rds_transport *r_trans;
+ void *r_trans_private;
+};
+
+/* Flags for mr->r_state */
+#define RDS_MR_DEAD 0
+
+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_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;
+ } rdma;
+ struct rm_data_op {
+ unsigned int op_active:1;
+ unsigned int op_notify: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);
+ 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);
+};
+
+/* 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;
+};
+
+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;
+
+};
+
+/* 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, 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,
+ 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_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_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, char __user *optval, int optlen);
+int rds_get_mr_for_dest(struct rds_sock *rs, char __user *optval, int optlen);
+int rds_free_mr(struct rds_sock *rs, char __user *optval, int optlen);
+void rds_rdma_drop_keys(struct rds_sock *rs);
+int rds_rdma_extra_size(struct rds_rdma_args *args);
+int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
+ struct cmsghdr *cmsg);
+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);
+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 rds_mr *mr);
+static inline void rds_mr_put(struct rds_mr *mr)
+{
+ if (refcount_dec_and_test(&mr->r_refcount))
+ __rds_put_mr_final(mr);
+}
+
+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));
+}
+
+/* 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