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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
*
* Copyright (c) 2011, 2012, Intel Corporation.
*
* Author: Zach Brown <zab@zabbo.net>
* Author: Peter J. Braam <braam@clusterfs.com>
* Author: Phil Schwan <phil@clusterfs.com>
* Author: Eric Barton <eric@bartonsoftware.com>
*
* This file is part of Lustre, http://www.lustre.org
*
* Portals is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* Portals is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Portals; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#define DEBUG_PORTAL_ALLOC
#define DEBUG_SUBSYSTEM S_LND
#include "socklnd_lib-linux.h"
#include "../../../include/linux/libcfs/libcfs.h"
#include "../../../include/linux/lnet/lnet.h"
#include "../../../include/linux/lnet/lib-lnet.h"
#include "../../../include/linux/lnet/socklnd.h"
#include "../../../include/linux/lnet/lnet-sysctl.h"
#define SOCKNAL_PEER_HASH_SIZE 101 /* # peer lists */
#define SOCKNAL_RESCHED 100 /* # scheduler loops before reschedule */
#define SOCKNAL_INSANITY_RECONN 5000 /* connd is trying on reconn infinitely */
#define SOCKNAL_ENOMEM_RETRY CFS_TICK /* jiffies between retries */
#define SOCKNAL_SINGLE_FRAG_TX 0 /* disable multi-fragment sends */
#define SOCKNAL_SINGLE_FRAG_RX 0 /* disable multi-fragment receives */
#define SOCKNAL_VERSION_DEBUG 0 /* enable protocol version debugging */
/* risk kmap deadlock on multi-frag I/O (backs off to single-frag if disabled).
* no risk if we're not running on a CONFIG_HIGHMEM platform. */
#ifdef CONFIG_HIGHMEM
# define SOCKNAL_RISK_KMAP_DEADLOCK 0
#else
# define SOCKNAL_RISK_KMAP_DEADLOCK 1
#endif
struct ksock_sched_info;
typedef struct /* per scheduler state */
{
spinlock_t kss_lock; /* serialise */
struct list_head kss_rx_conns; /* conn waiting to be read */
/* conn waiting to be written */
struct list_head kss_tx_conns;
/* zombie noop tx list */
struct list_head kss_zombie_noop_txs;
wait_queue_head_t kss_waitq; /* where scheduler sleeps */
/* # connections assigned to this scheduler */
int kss_nconns;
struct ksock_sched_info *kss_info; /* owner of it */
struct page *kss_rx_scratch_pgs[LNET_MAX_IOV];
struct iovec kss_scratch_iov[LNET_MAX_IOV];
} ksock_sched_t;
struct ksock_sched_info {
int ksi_nthreads_max; /* max allowed threads */
int ksi_nthreads; /* number of threads */
int ksi_cpt; /* CPT id */
ksock_sched_t *ksi_scheds; /* array of schedulers */
};
#define KSOCK_CPT_SHIFT 16
#define KSOCK_THREAD_ID(cpt, sid) (((cpt) << KSOCK_CPT_SHIFT) | (sid))
#define KSOCK_THREAD_CPT(id) ((id) >> KSOCK_CPT_SHIFT)
#define KSOCK_THREAD_SID(id) ((id) & ((1UL << KSOCK_CPT_SHIFT) - 1))
typedef struct /* in-use interface */
{
__u32 ksni_ipaddr; /* interface's IP address */
__u32 ksni_netmask; /* interface's network mask */
int ksni_nroutes; /* # routes using (active) */
int ksni_npeers; /* # peers using (passive) */
char ksni_name[IFNAMSIZ]; /* interface name */
} ksock_interface_t;
typedef struct {
/* "stuck" socket timeout (seconds) */
int *ksnd_timeout;
/* # scheduler threads in each pool while starting */
int *ksnd_nscheds;
int *ksnd_nconnds; /* # connection daemons */
int *ksnd_nconnds_max; /* max # connection daemons */
int *ksnd_min_reconnectms; /* first connection retry after (ms)... */
int *ksnd_max_reconnectms; /* ...exponentially increasing to this */
int *ksnd_eager_ack; /* make TCP ack eagerly? */
int *ksnd_typed_conns; /* drive sockets by type? */
int *ksnd_min_bulk; /* smallest "large" message */
int *ksnd_tx_buffer_size; /* socket tx buffer size */
int *ksnd_rx_buffer_size; /* socket rx buffer size */
int *ksnd_nagle; /* enable NAGLE? */
int *ksnd_round_robin; /* round robin for multiple interfaces */
int *ksnd_keepalive; /* # secs for sending keepalive NOOP */
int *ksnd_keepalive_idle; /* # idle secs before 1st probe */
int *ksnd_keepalive_count; /* # probes */
int *ksnd_keepalive_intvl; /* time between probes */
int *ksnd_credits; /* # concurrent sends */
int *ksnd_peertxcredits; /* # concurrent sends to 1 peer */
int *ksnd_peerrtrcredits; /* # per-peer router buffer credits */
int *ksnd_peertimeout; /* seconds to consider peer dead */
int *ksnd_enable_csum; /* enable check sum */
int *ksnd_inject_csum_error; /* set non-zero to inject checksum error */
int *ksnd_nonblk_zcack; /* always send zc-ack on non-blocking connection */
unsigned int *ksnd_zc_min_payload; /* minimum zero copy payload size */
int *ksnd_zc_recv; /* enable ZC receive (for Chelsio TOE) */
int *ksnd_zc_recv_min_nfrags; /* minimum # of fragments to enable ZC receive */
} ksock_tunables_t;
typedef struct {
__u64 ksnn_incarnation; /* my epoch */
spinlock_t ksnn_lock; /* serialise */
struct list_head ksnn_list; /* chain on global list */
int ksnn_npeers; /* # peers */
int ksnn_shutdown; /* shutting down? */
int ksnn_ninterfaces; /* IP interfaces */
ksock_interface_t ksnn_interfaces[LNET_MAX_INTERFACES];
} ksock_net_t;
/** connd timeout */
#define SOCKNAL_CONND_TIMEOUT 120
/** reserved thread for accepting & creating new connd */
#define SOCKNAL_CONND_RESV 1
typedef struct {
int ksnd_init; /* initialisation state */
int ksnd_nnets; /* # networks set up */
struct list_head ksnd_nets; /* list of nets */
/* stabilize peer/conn ops */
rwlock_t ksnd_global_lock;
/* hash table of all my known peers */
struct list_head *ksnd_peers;
int ksnd_peer_hash_size; /* size of ksnd_peers */
int ksnd_nthreads; /* # live threads */
int ksnd_shuttingdown; /* tell threads to exit */
/* schedulers information */
struct ksock_sched_info **ksnd_sched_info;
atomic_t ksnd_nactive_txs; /* #active txs */
struct list_head ksnd_deathrow_conns; /* conns to close: reaper_lock*/
struct list_head ksnd_zombie_conns; /* conns to free: reaper_lock */
struct list_head ksnd_enomem_conns; /* conns to retry: reaper_lock*/
wait_queue_head_t ksnd_reaper_waitq; /* reaper sleeps here */
unsigned long ksnd_reaper_waketime;/* when reaper will wake */
spinlock_t ksnd_reaper_lock; /* serialise */
int ksnd_enomem_tx; /* test ENOMEM sender */
int ksnd_stall_tx; /* test sluggish sender */
int ksnd_stall_rx; /* test sluggish receiver */
struct list_head ksnd_connd_connreqs; /* incoming connection requests */
struct list_head ksnd_connd_routes; /* routes waiting to be connected */
wait_queue_head_t ksnd_connd_waitq; /* connds sleep here */
int ksnd_connd_connecting;/* # connds connecting */
/** time stamp of the last failed connecting attempt */
long ksnd_connd_failed_stamp;
/** # starting connd */
unsigned ksnd_connd_starting;
/** time stamp of the last starting connd */
long ksnd_connd_starting_stamp;
/** # running connd */
unsigned ksnd_connd_running;
spinlock_t ksnd_connd_lock; /* serialise */
struct list_head ksnd_idle_noop_txs; /* list head for freed noop tx */
spinlock_t ksnd_tx_lock; /* serialise, g_lock unsafe */
} ksock_nal_data_t;
#define SOCKNAL_INIT_NOTHING 0
#define SOCKNAL_INIT_DATA 1
#define SOCKNAL_INIT_ALL 2
/* A packet just assembled for transmission is represented by 1 or more
* struct iovec fragments (the first frag contains the portals header),
* followed by 0 or more lnet_kiov_t fragments.
*
* On the receive side, initially 1 struct iovec fragment is posted for
* receive (the header). Once the header has been received, the payload is
* received into either struct iovec or lnet_kiov_t fragments, depending on
* what the header matched or whether the message needs forwarding. */
struct ksock_conn; /* forward ref */
struct ksock_peer; /* forward ref */
struct ksock_route; /* forward ref */
struct ksock_proto; /* forward ref */
typedef struct /* transmit packet */
{
struct list_head tx_list; /* queue on conn for transmission etc */
struct list_head tx_zc_list; /* queue on peer for ZC request */
atomic_t tx_refcount; /* tx reference count */
int tx_nob; /* # packet bytes */
int tx_resid; /* residual bytes */
int tx_niov; /* # packet iovec frags */
struct iovec *tx_iov; /* packet iovec frags */
int tx_nkiov; /* # packet page frags */
unsigned short tx_zc_aborted; /* aborted ZC request */
unsigned short tx_zc_capable:1; /* payload is large enough for ZC */
unsigned short tx_zc_checked:1; /* Have I checked if I should ZC? */
unsigned short tx_nonblk:1; /* it's a non-blocking ACK */
lnet_kiov_t *tx_kiov; /* packet page frags */
struct ksock_conn *tx_conn; /* owning conn */
lnet_msg_t *tx_lnetmsg; /* lnet message for lnet_finalize() */
unsigned long tx_deadline; /* when (in jiffies) tx times out */
ksock_msg_t tx_msg; /* socklnd message buffer */
int tx_desc_size; /* size of this descriptor */
union {
struct {
struct iovec iov; /* virt hdr */
lnet_kiov_t kiov[0]; /* paged payload */
} paged;
struct {
struct iovec iov[1]; /* virt hdr + payload */
} virt;
} tx_frags;
} ksock_tx_t;
#define KSOCK_NOOP_TX_SIZE ((int)offsetof(ksock_tx_t, tx_frags.paged.kiov[0]))
/* network zero copy callback descriptor embedded in ksock_tx_t */
/* space for the rx frag descriptors; we either read a single contiguous
* header, or up to LNET_MAX_IOV frags of payload of either type. */
typedef union {
struct iovec iov[LNET_MAX_IOV];
lnet_kiov_t kiov[LNET_MAX_IOV];
} ksock_rxiovspace_t;
#define SOCKNAL_RX_KSM_HEADER 1 /* reading ksock message header */
#define SOCKNAL_RX_LNET_HEADER 2 /* reading lnet message header */
#define SOCKNAL_RX_PARSE 3 /* Calling lnet_parse() */
#define SOCKNAL_RX_PARSE_WAIT 4 /* waiting to be told to read the body */
#define SOCKNAL_RX_LNET_PAYLOAD 5 /* reading lnet payload (to deliver here) */
#define SOCKNAL_RX_SLOP 6 /* skipping body */
typedef struct ksock_conn {
struct ksock_peer *ksnc_peer; /* owning peer */
struct ksock_route *ksnc_route; /* owning route */
struct list_head ksnc_list; /* stash on peer's conn list */
struct socket *ksnc_sock; /* actual socket */
void *ksnc_saved_data_ready; /* socket's original data_ready() callback */
void *ksnc_saved_write_space; /* socket's original write_space() callback */
atomic_t ksnc_conn_refcount; /* conn refcount */
atomic_t ksnc_sock_refcount; /* sock refcount */
ksock_sched_t *ksnc_scheduler; /* who schedules this connection */
__u32 ksnc_myipaddr; /* my IP */
__u32 ksnc_ipaddr; /* peer's IP */
int ksnc_port; /* peer's port */
signed int ksnc_type:3; /* type of connection,
* should be signed value */
unsigned int ksnc_closing:1; /* being shut down */
unsigned int ksnc_flip:1; /* flip or not, only for V2.x */
unsigned int ksnc_zc_capable:1; /* enable to ZC */
struct ksock_proto *ksnc_proto; /* protocol for the connection */
/* reader */
struct list_head ksnc_rx_list; /* where I enq waiting input or a forwarding descriptor */
unsigned long ksnc_rx_deadline; /* when (in jiffies) receive times out */
__u8 ksnc_rx_started; /* started receiving a message */
__u8 ksnc_rx_ready; /* data ready to read */
__u8 ksnc_rx_scheduled;/* being progressed */
__u8 ksnc_rx_state; /* what is being read */
int ksnc_rx_nob_left; /* # bytes to next hdr/body */
int ksnc_rx_nob_wanted; /* bytes actually wanted */
int ksnc_rx_niov; /* # iovec frags */
struct iovec *ksnc_rx_iov; /* the iovec frags */
int ksnc_rx_nkiov; /* # page frags */
lnet_kiov_t *ksnc_rx_kiov; /* the page frags */
ksock_rxiovspace_t ksnc_rx_iov_space;/* space for frag descriptors */
__u32 ksnc_rx_csum; /* partial checksum for incoming data */
void *ksnc_cookie; /* rx lnet_finalize passthru arg */
ksock_msg_t ksnc_msg; /* incoming message buffer:
* V2.x message takes the
* whole struct
* V1.x message is a bare
* lnet_hdr_t, it's stored in
* ksnc_msg.ksm_u.lnetmsg */
/* WRITER */
struct list_head ksnc_tx_list; /* where I enq waiting for output space */
struct list_head ksnc_tx_queue; /* packets waiting to be sent */
ksock_tx_t *ksnc_tx_carrier; /* next TX that can carry a LNet message or ZC-ACK */
unsigned long ksnc_tx_deadline; /* when (in jiffies) tx times out */
int ksnc_tx_bufnob; /* send buffer marker */
atomic_t ksnc_tx_nob; /* # bytes queued */
int ksnc_tx_ready; /* write space */
int ksnc_tx_scheduled; /* being progressed */
unsigned long ksnc_tx_last_post; /* time stamp of the last posted TX */
} ksock_conn_t;
typedef struct ksock_route {
struct list_head ksnr_list; /* chain on peer route list */
struct list_head ksnr_connd_list; /* chain on ksnr_connd_routes */
struct ksock_peer *ksnr_peer; /* owning peer */
atomic_t ksnr_refcount; /* # users */
unsigned long ksnr_timeout; /* when (in jiffies) reconnection can happen next */
long ksnr_retry_interval; /* how long between retries */
__u32 ksnr_myipaddr; /* my IP */
__u32 ksnr_ipaddr; /* IP address to connect to */
int ksnr_port; /* port to connect to */
unsigned int ksnr_scheduled:1; /* scheduled for attention */
unsigned int ksnr_connecting:1;/* connection establishment in progress */
unsigned int ksnr_connected:4; /* connections established by type */
unsigned int ksnr_deleted:1; /* been removed from peer? */
unsigned int ksnr_share_count; /* created explicitly? */
int ksnr_conn_count; /* # conns established by this route */
} ksock_route_t;
#define SOCKNAL_KEEPALIVE_PING 1 /* cookie for keepalive ping */
typedef struct ksock_peer {
struct list_head ksnp_list; /* stash on global peer list */
unsigned long ksnp_last_alive; /* when (in jiffies) I was last alive */
lnet_process_id_t ksnp_id; /* who's on the other end(s) */
atomic_t ksnp_refcount; /* # users */
int ksnp_sharecount; /* lconf usage counter */
int ksnp_closing; /* being closed */
int ksnp_accepting;/* # passive connections pending */
int ksnp_error; /* errno on closing last conn */
__u64 ksnp_zc_next_cookie;/* ZC completion cookie */
__u64 ksnp_incarnation; /* latest known peer incarnation */
struct ksock_proto *ksnp_proto; /* latest known peer protocol */
struct list_head ksnp_conns; /* all active connections */
struct list_head ksnp_routes; /* routes */
struct list_head ksnp_tx_queue; /* waiting packets */
spinlock_t ksnp_lock; /* serialize, g_lock unsafe */
struct list_head ksnp_zc_req_list; /* zero copy requests wait for ACK */
unsigned long ksnp_send_keepalive; /* time to send keepalive */
lnet_ni_t *ksnp_ni; /* which network */
int ksnp_n_passive_ips; /* # of... */
__u32 ksnp_passive_ips[LNET_MAX_INTERFACES]; /* preferred local interfaces */
} ksock_peer_t;
typedef struct ksock_connreq {
struct list_head ksncr_list; /* stash on ksnd_connd_connreqs */
lnet_ni_t *ksncr_ni; /* chosen NI */
struct socket *ksncr_sock; /* accepted socket */
} ksock_connreq_t;
extern ksock_nal_data_t ksocknal_data;
extern ksock_tunables_t ksocknal_tunables;
#define SOCKNAL_MATCH_NO 0 /* TX can't match type of connection */
#define SOCKNAL_MATCH_YES 1 /* TX matches type of connection */
#define SOCKNAL_MATCH_MAY 2 /* TX can be sent on the connection, but not preferred */
typedef struct ksock_proto {
int pro_version; /* version number of protocol */
int (*pro_send_hello)(ksock_conn_t *, ksock_hello_msg_t *); /* handshake function */
int (*pro_recv_hello)(ksock_conn_t *, ksock_hello_msg_t *, int);/* handshake function */
void (*pro_pack)(ksock_tx_t *); /* message pack */
void (*pro_unpack)(ksock_msg_t *); /* message unpack */
ksock_tx_t *(*pro_queue_tx_msg)(ksock_conn_t *, ksock_tx_t *); /* queue tx on the connection */
int (*pro_queue_tx_zcack)(ksock_conn_t *, ksock_tx_t *, __u64); /* queue ZC ack on the connection */
int (*pro_handle_zcreq)(ksock_conn_t *, __u64, int); /* handle ZC request */
int (*pro_handle_zcack)(ksock_conn_t *, __u64, __u64); /* handle ZC ACK */
int (*pro_match_tx)(ksock_conn_t *, ksock_tx_t *, int); /* msg type matches the connection type:
* return value:
* return MATCH_NO : no
* return MATCH_YES : matching type
* return MATCH_MAY : can be backup */
} ksock_proto_t;
extern ksock_proto_t ksocknal_protocol_v1x;
extern ksock_proto_t ksocknal_protocol_v2x;
extern ksock_proto_t ksocknal_protocol_v3x;
#define KSOCK_PROTO_V1_MAJOR LNET_PROTO_TCP_VERSION_MAJOR
#define KSOCK_PROTO_V1_MINOR LNET_PROTO_TCP_VERSION_MINOR
#define KSOCK_PROTO_V1 KSOCK_PROTO_V1_MAJOR
#ifndef CPU_MASK_NONE
#define CPU_MASK_NONE 0UL
#endif
static inline int
ksocknal_route_mask(void)
{
if (!*ksocknal_tunables.ksnd_typed_conns)
return (1 << SOCKLND_CONN_ANY);
return ((1 << SOCKLND_CONN_CONTROL) |
(1 << SOCKLND_CONN_BULK_IN) |
(1 << SOCKLND_CONN_BULK_OUT));
}
static inline struct list_head *
ksocknal_nid2peerlist (lnet_nid_t nid)
{
unsigned int hash = ((unsigned int)nid) % ksocknal_data.ksnd_peer_hash_size;
return &ksocknal_data.ksnd_peers[hash];
}
static inline void
ksocknal_conn_addref (ksock_conn_t *conn)
{
LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
atomic_inc(&conn->ksnc_conn_refcount);
}
extern void ksocknal_queue_zombie_conn (ksock_conn_t *conn);
extern void ksocknal_finalize_zcreq(ksock_conn_t *conn);
static inline void
ksocknal_conn_decref (ksock_conn_t *conn)
{
LASSERT (atomic_read(&conn->ksnc_conn_refcount) > 0);
if (atomic_dec_and_test(&conn->ksnc_conn_refcount))
ksocknal_queue_zombie_conn(conn);
}
static inline int
ksocknal_connsock_addref (ksock_conn_t *conn)
{
int rc = -ESHUTDOWN;
read_lock(&ksocknal_data.ksnd_global_lock);
if (!conn->ksnc_closing) {
LASSERT(atomic_read(&conn->ksnc_sock_refcount) > 0);
atomic_inc(&conn->ksnc_sock_refcount);
rc = 0;
}
read_unlock(&ksocknal_data.ksnd_global_lock);
return rc;
}
static inline void
ksocknal_connsock_decref (ksock_conn_t *conn)
{
LASSERT (atomic_read(&conn->ksnc_sock_refcount) > 0);
if (atomic_dec_and_test(&conn->ksnc_sock_refcount)) {
LASSERT (conn->ksnc_closing);
libcfs_sock_release(conn->ksnc_sock);
conn->ksnc_sock = NULL;
ksocknal_finalize_zcreq(conn);
}
}
static inline void
ksocknal_tx_addref (ksock_tx_t *tx)
{
LASSERT (atomic_read(&tx->tx_refcount) > 0);
atomic_inc(&tx->tx_refcount);
}
extern void ksocknal_tx_prep (ksock_conn_t *, ksock_tx_t *tx);
extern void ksocknal_tx_done (lnet_ni_t *ni, ksock_tx_t *tx);
static inline void
ksocknal_tx_decref (ksock_tx_t *tx)
{
LASSERT (atomic_read(&tx->tx_refcount) > 0);
if (atomic_dec_and_test(&tx->tx_refcount))
ksocknal_tx_done(NULL, tx);
}
static inline void
ksocknal_route_addref (ksock_route_t *route)
{
LASSERT (atomic_read(&route->ksnr_refcount) > 0);
atomic_inc(&route->ksnr_refcount);
}
extern void ksocknal_destroy_route (ksock_route_t *route);
static inline void
ksocknal_route_decref (ksock_route_t *route)
{
LASSERT (atomic_read (&route->ksnr_refcount) > 0);
if (atomic_dec_and_test(&route->ksnr_refcount))
ksocknal_destroy_route (route);
}
static inline void
ksocknal_peer_addref (ksock_peer_t *peer)
{
LASSERT (atomic_read (&peer->ksnp_refcount) > 0);
atomic_inc(&peer->ksnp_refcount);
}
extern void ksocknal_destroy_peer (ksock_peer_t *peer);
static inline void
ksocknal_peer_decref (ksock_peer_t *peer)
{
LASSERT (atomic_read (&peer->ksnp_refcount) > 0);
if (atomic_dec_and_test(&peer->ksnp_refcount))
ksocknal_destroy_peer (peer);
}
int ksocknal_startup (lnet_ni_t *ni);
void ksocknal_shutdown (lnet_ni_t *ni);
int ksocknal_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg);
int ksocknal_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg);
int ksocknal_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg,
int delayed, unsigned int niov,
struct iovec *iov, lnet_kiov_t *kiov,
unsigned int offset, unsigned int mlen, unsigned int rlen);
int ksocknal_accept(lnet_ni_t *ni, struct socket *sock);
extern int ksocknal_add_peer(lnet_ni_t *ni, lnet_process_id_t id, __u32 ip, int port);
extern ksock_peer_t *ksocknal_find_peer_locked (lnet_ni_t *ni, lnet_process_id_t id);
extern ksock_peer_t *ksocknal_find_peer (lnet_ni_t *ni, lnet_process_id_t id);
extern void ksocknal_peer_failed (ksock_peer_t *peer);
extern int ksocknal_create_conn (lnet_ni_t *ni, ksock_route_t *route,
struct socket *sock, int type);
extern void ksocknal_close_conn_locked (ksock_conn_t *conn, int why);
extern void ksocknal_terminate_conn (ksock_conn_t *conn);
extern void ksocknal_destroy_conn (ksock_conn_t *conn);
extern int ksocknal_close_peer_conns_locked (ksock_peer_t *peer,
__u32 ipaddr, int why);
extern int ksocknal_close_conn_and_siblings (ksock_conn_t *conn, int why);
extern int ksocknal_close_matching_conns (lnet_process_id_t id, __u32 ipaddr);
extern ksock_conn_t *ksocknal_find_conn_locked(ksock_peer_t *peer,
ksock_tx_t *tx, int nonblk);
extern int ksocknal_launch_packet(lnet_ni_t *ni, ksock_tx_t *tx,
lnet_process_id_t id);
extern ksock_tx_t *ksocknal_alloc_tx(int type, int size);
extern void ksocknal_free_tx (ksock_tx_t *tx);
extern ksock_tx_t *ksocknal_alloc_tx_noop(__u64 cookie, int nonblk);
extern void ksocknal_next_tx_carrier(ksock_conn_t *conn);
extern void ksocknal_queue_tx_locked (ksock_tx_t *tx, ksock_conn_t *conn);
extern void ksocknal_txlist_done (lnet_ni_t *ni, struct list_head *txlist,
int error);
extern void ksocknal_notify (lnet_ni_t *ni, lnet_nid_t gw_nid, int alive);
extern void ksocknal_query (struct lnet_ni *ni, lnet_nid_t nid, unsigned long *when);
extern int ksocknal_thread_start(int (*fn)(void *arg), void *arg, char *name);
extern void ksocknal_thread_fini (void);
extern void ksocknal_launch_all_connections_locked (ksock_peer_t *peer);
extern ksock_route_t *ksocknal_find_connectable_route_locked (ksock_peer_t *peer);
extern ksock_route_t *ksocknal_find_connecting_route_locked (ksock_peer_t *peer);
extern int ksocknal_new_packet (ksock_conn_t *conn, int skip);
extern int ksocknal_scheduler (void *arg);
extern int ksocknal_connd (void *arg);
extern int ksocknal_reaper (void *arg);
extern int ksocknal_send_hello (lnet_ni_t *ni, ksock_conn_t *conn,
lnet_nid_t peer_nid, ksock_hello_msg_t *hello);
extern int ksocknal_recv_hello (lnet_ni_t *ni, ksock_conn_t *conn,
ksock_hello_msg_t *hello, lnet_process_id_t *id,
__u64 *incarnation);
extern void ksocknal_read_callback(ksock_conn_t *conn);
extern void ksocknal_write_callback(ksock_conn_t *conn);
extern int ksocknal_lib_zc_capable(ksock_conn_t *conn);
extern void ksocknal_lib_save_callback(struct socket *sock, ksock_conn_t *conn);
extern void ksocknal_lib_set_callback(struct socket *sock, ksock_conn_t *conn);
extern void ksocknal_lib_reset_callback(struct socket *sock, ksock_conn_t *conn);
extern void ksocknal_lib_push_conn (ksock_conn_t *conn);
extern int ksocknal_lib_get_conn_addrs (ksock_conn_t *conn);
extern int ksocknal_lib_setup_sock (struct socket *so);
extern int ksocknal_lib_send_iov (ksock_conn_t *conn, ksock_tx_t *tx);
extern int ksocknal_lib_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx);
extern void ksocknal_lib_eager_ack (ksock_conn_t *conn);
extern int ksocknal_lib_recv_iov (ksock_conn_t *conn);
extern int ksocknal_lib_recv_kiov (ksock_conn_t *conn);
extern int ksocknal_lib_get_conn_tunables (ksock_conn_t *conn, int *txmem,
int *rxmem, int *nagle);
extern int ksocknal_tunables_init(void);
extern void ksocknal_lib_csum_tx(ksock_tx_t *tx);
extern int ksocknal_lib_memory_pressure(ksock_conn_t *conn);
extern int ksocknal_lib_bind_thread_to_cpu(int id);
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