Viewing: kfilnd.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright 2022 Hewlett Packard Enterprise Development LP
*/
/*
* This file is part of Lustre, http://www.lustre.org/
*
* kfilnd main interface.
*/
#ifndef _KFILND_
#define _KFILND_
#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/uio.h>
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <linux/rhashtable.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/ktime.h>
#include <lustre_compat/linux/timer.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/list.h>
#include <linux/kmod.h>
#include <linux/sysctl.h>
#include <linux/pci.h>
#include <net/sock.h>
#include <linux/in.h>
#define KFILND_VERSION "0.2.0"
#define DEBUG_SUBSYSTEM S_LND
#include <linux/libcfs/libcfs.h>
#include <linux/lnet/lib-lnet.h>
#include <linux/lnet/lnet_rdma.h>
#include "kfi_endpoint.h"
#include "kfi_errno.h"
#include "kfi_rma.h"
#include "kfi_tagged.h"
#include "kfi_cxi_ext.h"
/* KFILND CFS fail range 0xF100 - 0xF1FF. */
#define CFS_KFI_FAIL_SEND_EVENT 0xF100
#define CFS_KFI_FAIL_READ_EVENT 0xF101
#define CFS_KFI_FAIL_WRITE_EVENT 0xF102
#define CFS_KFI_FAIL_TAGGED_SEND_EVENT 0xF103
#define CFS_KFI_FAIL_TAGGED_RECV_EVENT 0xF104
#define CFS_KFI_FAIL_BULK_TIMEOUT 0xF105
#define CFS_KFI_FAIL_SEND 0xF106
#define CFS_KFI_FAIL_READ 0xF107
#define CFS_KFI_FAIL_WRITE 0xF108
#define CFS_KFI_FAIL_TAGGED_SEND 0xF109
#define CFS_KFI_FAIL_TAGGED_RECV 0xF10A
#define CFS_KFI_FAIL_SEND_EAGAIN 0xF10B
#define CFS_KFI_FAIL_READ_EAGAIN 0xF10C
#define CFS_KFI_FAIL_WRITE_EAGAIN 0xF10D
#define CFS_KFI_FAIL_TAGGED_SEND_EAGAIN 0xF10E
#define CFS_KFI_FAIL_TAGGED_RECV_EAGAIN 0xF10F
#define CFS_KFI_FAIL_TAGGED_RECV_CANCEL_EAGAIN 0xF110
#define CFS_KFI_FAIL_RECV_EAGAIN 0xF111
#define CFS_KFI_FAIL_RECV 0xF112
#define CFS_KFI_FAIL_MSG_UNPACK 0xF113
#define CFS_KFI_FAIL_MSG_TYPE 0xF114
#define CFS_KFI_FAIL_WAIT_SEND_COMP1 0xF115
#define CFS_KFI_FAIL_WAIT_SEND_COMP2 0xF116
#define CFS_KFI_FAIL_WAIT_SEND_COMP3 0xF117
#define CFS_KFI_REPLAY_IDLE_EVENT 0xF118
#define CFS_KFI_REPLAY_RX_HELLO_REQ 0xF119
#define CFS_KFI_FAIL_MSG_TYPE_EAGAIN 0xF11A
/* Maximum number of transaction keys supported. */
#define KFILND_EP_KEY_BITS 16U
#define KFILND_EP_KEY_MAX (BIT(KFILND_EP_KEY_BITS) - 1)
/* Some constants which should be turned into tunables */
#define KFILND_IMMEDIATE_MSG_SIZE 4096
#define KFILND_MY_PROCID 49152
/* default kfilnd timeout in seconds */
#define KFILND_TIMEOUT_DEFAULT 125
/* 256 Rx contexts max */
#define KFILND_FAB_RX_CTX_BITS 8
/* Get the KFI base address from a KFI RX address. RX context information is
* stored in the MSBs of the KFI address.
*/
#define KFILND_BASE_ADDR(addr) \
((addr) & ((1UL << (64 - KFILND_FAB_RX_CTX_BITS)) - 1))
#define MIN_DURATION_RESET 0x7fffffffffffffffLL
/* States used by all kfilnd structures */
enum kfilnd_object_states {
KFILND_STATE_UNINITIALIZED,
KFILND_STATE_INITIALIZED,
KFILND_STATE_SHUTTING_DOWN
};
enum kfilnd_ni_lnd_tunables_attr {
LNET_NET_KFILND_TUNABLES_ATTR_UNSPEC = 0,
LNET_NET_KFILND_TUNABLES_ATTR_PROV_MAJOR,
LNET_NET_KFILND_TUNABLES_ATTR_PROV_MINOR,
LNET_NET_KFILND_TUNABLES_ATTR_AUTH_KEY,
LNET_NET_KFILND_TUNABLES_ATTR_TRAFFIC_CLASS,
LNET_NET_KFILND_TUNABLES_ATTR_TIMEOUT,
LNET_NET_KFILND_TUNABLES_ATTR_TRAFFIC_CLASS_NUM,
__LNET_NET_KFILND_TUNABLES_ATTR_MAX_PLUS_ONE,
};
#define LNET_NET_KFILND_TUNABLES_ATTR_MAX (__LNET_NET_KFILND_TUNABLES_ATTR_MAX_PLUS_ONE - 1)
extern struct lnet_ioctl_config_kfilnd_tunables kfi_default_tunables;
extern struct dentry *kfilnd_debug_dir;
extern const struct file_operations kfilnd_initiator_state_stats_file_ops;
extern const struct file_operations kfilnd_target_state_stats_file_ops;
extern const struct file_operations kfilnd_target_stats_file_ops;
extern const struct file_operations kfilnd_initiator_stats_file_ops;
extern const struct file_operations kfilnd_reset_stats_file_ops;
extern const struct file_operations kfilnd_mempool_stats_file_ops;
extern struct workqueue_struct *kfilnd_wq;
extern int kfi_timeout;
extern unsigned int cksum;
extern unsigned int tx_scale_factor;
extern unsigned int rx_cq_scale_factor;
extern unsigned int tx_cq_scale_factor;
extern unsigned int eq_size;
extern unsigned int immediate_rx_buf_count;
extern unsigned int prov_cpu_exclusive;
extern unsigned int wq_high_priority;
extern unsigned int wq_cpu_intensive;
extern unsigned int wq_max_active;
int kfilnd_tunables_setup(struct lnet_lnd_tunables *lnd_tunables, bool set,
struct lnet_ioctl_config_lnd_cmn_tunables *net_tunables);
int kfilnd_tunables_init(void);
int kfilnd_get_tn_reserve_min(void);
int kfilnd_get_msg_reserve_min(void);
int kfilnd_get_peer_credits(void);
int kfilnd_tn_get_mempool_stats(int *tn_min, int *tn_curr,
int *msg_min, int *msg_curr);
struct kfilnd_transaction;
struct kfilnd_ep;
struct kfilnd_dev;
/* Multi-receive buffers for immediate receives */
struct kfilnd_immediate_buffer {
void *immed_buf;
size_t immed_buf_size;
struct page *immed_buf_page;
atomic_t immed_ref;
bool immed_no_repost;
struct list_head replay_entry;
struct kfilnd_ep *immed_end;
};
extern atomic_t kfilnd_rx_count;
struct kfilnd_cq;
struct kfilnd_cq_work {
struct kfilnd_cq *cq;
unsigned int work_cpu;
struct work_struct work;
};
struct kfilnd_cq {
struct kfilnd_ep *ep;
struct kfid_cq *cq;
unsigned int cq_work_count;
struct kfilnd_cq_work cq_works[];
};
struct kfilnd_ep {
/* The contexts for this CPT */
struct kfid_ep *end_tx;
struct kfid_ep *end_rx;
/* Corresponding CQs */
struct kfilnd_cq *end_tx_cq;
struct kfilnd_cq *end_rx_cq;
/* Specific config values for this endpoint */
struct kfilnd_dev *end_dev;
int end_cpt;
int end_context_id;
/* List of transactions. */
struct list_head tn_list;
spinlock_t tn_list_lock;
/* Replay queues. */
struct list_head tn_replay;
struct list_head imm_buffer_replay;
spinlock_t replay_lock;
struct timer_list replay_timer;
struct work_struct replay_work;
atomic_t replay_count;
/* Key used to build the tag for tagged buffers. */
struct ida keys;
/* Pre-posted immediate buffers */
struct kfilnd_immediate_buffer end_immed_bufs[];
};
/* Newly allocated peer */
#define KP_STATE_NEW 0x1
/* Peer after successful hello handshake */
#define KP_STATE_UPTODATE 0x2
/* Peer experienced some sort of network failure */
#define KP_STATE_STALE 0x3
/* We suspect this peer is actually down or otherwise unreachable */
#define KP_STATE_DOWN 0x4
/* We received a HELLO request from a new peer, and are waiting
* for the response to our HELLO request. We can handle RX events for
* such a peer, but we will throttle sends to this peer until it is
* up-to-date
*/
#define KP_STATE_WAIT_RSP 0x5
struct kfilnd_peer {
struct rhash_head kp_node;
struct rcu_head kp_rcu_head;
struct kfilnd_dev *kp_dev;
lnet_nid_t kp_nid;
kfi_addr_t kp_addr;
atomic_t kp_rx_base;
atomic_t kp_remove_peer;
refcount_t kp_cnt;
time64_t kp_last_alive;
u16 kp_version;
u32 kp_local_session_key;
u32 kp_remote_session_key;
atomic_t kp_hello_state;
time64_t kp_hello_ts;
atomic_t kp_state;
};
static inline bool kfilnd_peer_deleted(struct kfilnd_peer *kp)
{
return atomic_read(&kp->kp_remove_peer) > 0;
}
static inline int kfilnd_timeout(void)
{
return kfi_timeout ?: lnet_get_lnd_timeout();
}
/* Values for kp_hello_state. Valid transitions:
* NONE -> INIT
* INIT -> NONE (only when fail to allocate kfilnd_tn for hello req)
* INIT -> SENDING
* SENDING -> NONE
*/
#define KP_HELLO_NONE 0 /* There is no hello request being sent */
#define KP_HELLO_INIT 1 /* Hello request is initializing */
#define KP_HELLO_SENDING 2 /* Hello request TN is in the state machine */
/* If kp_hello_state is SENDING then set to NONE */
static inline void kfilnd_peer_clear_hello_state(struct kfilnd_peer *kp)
{
atomic_cmpxchg(&kp->kp_hello_state, KP_HELLO_SENDING, KP_HELLO_NONE);
}
static inline bool kfilnd_peer_is_new_peer(struct kfilnd_peer *kp)
{
return atomic_read(&kp->kp_state) == KP_STATE_NEW;
}
/* We need to throttle messages if the peer is not up-to-date or stale */
static inline bool kfilnd_peer_needs_throttle(struct kfilnd_peer *kp)
{
unsigned int kp_state = atomic_read(&kp->kp_state);
return !(kp_state == KP_STATE_UPTODATE || kp_state == KP_STATE_STALE);
}
/* Peer needs hello if it is not up to date and there is not already a hello
* in flight.
*
* Called from the send path and the receive path. When called from send path
* we additionally consider the peer's last alive value, and proactively
* handshake peers that we haven't talked to in a while.
*
* If hello was sent more than LND timeout seconds ago, and we never received a
* response, then send another one.
*/
static inline bool kfilnd_peer_needs_hello(struct kfilnd_peer *kp,
bool proactive_handshake)
{
int hello_state = atomic_read(&kp->kp_hello_state);
if (hello_state == KP_HELLO_NONE) {
if (atomic_read(&kp->kp_state) != KP_STATE_UPTODATE)
return true;
else if (proactive_handshake &&
ktime_before(kp->kp_last_alive +
kfilnd_timeout() * 2,
ktime_get_seconds()))
return true;
} else if (hello_state == KP_HELLO_SENDING &&
ktime_before(kp->kp_hello_ts + kfilnd_timeout(),
ktime_get_seconds())) {
/* Sent hello but never received reply */
CDEBUG(D_NET,
"No response from %s(%p):0x%llx after %lld\n",
libcfs_nid2str(kp->kp_nid), kp, kp->kp_addr,
ktime_sub(ktime_get_seconds(), kp->kp_hello_ts));
kfilnd_peer_clear_hello_state(kp);
return true;
}
return false;
}
struct kfilnd_fab {
struct list_head entry;
struct list_head dom_list;
struct mutex dom_list_lock;
struct kfid_fabric *fabric;
struct kref cnt;
};
struct kfilnd_dom {
struct list_head entry;
struct list_head dev_list;
spinlock_t lock;
struct kfilnd_fab *fab;
struct kfid_domain *domain;
struct kref cnt;
};
/* Transaction States */
enum tn_states {
TN_STATE_INVALID,
/* Shared initiator and target states. */
TN_STATE_IDLE,
TN_STATE_WAIT_TAG_COMP,
/* Initiator immediate states. */
TN_STATE_IMM_SEND,
/* Initiator bulk states. */
TN_STATE_TAGGED_RECV_POSTED,
TN_STATE_SEND_FAILED,
TN_STATE_WAIT_COMP,
TN_STATE_WAIT_TIMEOUT_COMP,
TN_STATE_WAIT_SEND_COMP,
TN_STATE_WAIT_TIMEOUT_TAG_COMP,
TN_STATE_FAIL,
/* Target states. */
TN_STATE_IMM_RECV,
TN_STATE_WAIT_TAG_RMA_COMP,
/* Invalid max value. */
TN_STATE_MAX,
};
/* Base duration state stats. */
struct kfilnd_tn_duration_stat {
atomic64_t accumulated_duration;
atomic_t accumulated_count;
atomic64_t max_duration;
atomic64_t min_duration;
};
/* Transaction state stats group into 22 buckets. Bucket zero corresponds to
* LNet message size of 0 bytes and buckets 1 through 21 correspond to LNet
* message sizes of 1 to 1048576 bytes increasing by a power of 2. LNet message
* sizes are round up to the nearest power of 2.
*/
#define KFILND_DATA_SIZE_BUCKETS 22U
#define KFILND_DATA_SIZE_MAX_SIZE (1U << (KFILND_DATA_SIZE_BUCKETS - 2))
struct kfilnd_tn_data_size_duration_stats {
struct kfilnd_tn_duration_stat data_size[KFILND_DATA_SIZE_BUCKETS];
};
static inline unsigned int kfilnd_msg_len_to_data_size_bucket(size_t size)
{
u64 bit;
if (size == 0)
return 0;
if (size >= KFILND_DATA_SIZE_MAX_SIZE)
return KFILND_DATA_SIZE_BUCKETS - 1;
/* Round size up to the nearest power of 2. */
bit = fls64(size);
if (BIT(bit) < size)
bit++;
return (unsigned int)bit;
}
/* One data size duraction state bucket for each transaction state. */
struct kfilnd_tn_state_data_size_duration_stats {
struct kfilnd_tn_data_size_duration_stats state[TN_STATE_MAX];
};
struct kfilnd_dev {
struct list_head kfd_list; /* chain on kfid_devs */
struct lnet_ni *kfd_ni;
enum kfilnd_object_states kfd_state;
/* KFI LND domain the device is associated with. */
struct kfilnd_dom *dom;
/* Fields specific to kfabric operation */
spinlock_t kfd_lock;
struct kfid_ep *kfd_sep;
struct kfid_av *kfd_av;
struct kfilnd_ep **kfd_endpoints;
/* Map of LNet NI CPTs to endpoints. */
struct kfilnd_ep **cpt_to_endpoint;
/* Hash of LNet NIDs to KFI addresses. */
struct rhashtable peer_cache;
/* Per LNet NI states. */
struct kfilnd_tn_state_data_size_duration_stats initiator_state_stats;
struct kfilnd_tn_state_data_size_duration_stats target_state_stats;
struct kfilnd_tn_data_size_duration_stats initiator_stats;
struct kfilnd_tn_data_size_duration_stats target_stats;
/* Per LNet NI debugfs stats. */
struct dentry *dev_dir;
struct dentry *initiator_state_stats_file;
struct dentry *initiator_stats_file;
struct dentry *target_state_stats_file;
struct dentry *target_stats_file;
struct dentry *reset_stats_file;
/* Physical NIC address. */
unsigned int nic_addr;
atomic_t session_keys;
/* Physical device. */
struct device *device;
};
/* Invalid checksum value is treated as no checksum. */
/* TODO: Module parameter to disable checksum? */
#define NO_CHECKSUM 0x0
/* Hello message header. */
struct kfilnd_hello_msg {
/* Support kfilnd version. */
__u16 version;
/* Base RX context peer should used. */
__u16 rx_base;
/* Session key used by peer. */
__u32 session_key;
/* RX context count peer can target. */
__u16 rx_count;
} __packed;
/* Immediate message header. */
struct kfilnd_immed_msg {
/* Entire LNet header needed by the destination to match incoming
* message.
*/
struct lnet_hdr_nid4 hdr;
/* Entire LNet message payload. */
char payload[];
} __packed;
/* Bulk request message header. */
struct kfilnd_bulk_req_msg {
/* Entire LNet header needed by the destination to match incoming
* message.
*/
struct lnet_hdr_nid4 hdr;
/* Specific RX context the target must target to push/pull LNet
* payload.
*/
__u32 response_rx;
/* Memory key needed by the target to push/pull LNet payload. */
__u16 key;
} __packed;
struct kfilnd_bulk_req_msg_v2 {
/* Entire LNet header needed by the destination to match incoming
* message.
*/
struct lnet_hdr_nid4 kbrm2_hdr;
/* Specific RX context the target must target to push/pull LNet
* payload.
*/
__u32 kbrm2_response_rx;
/* Memory key needed by the target to push/pull LNet payload. */
__u16 kbrm2_key;
/* Session key used by peer. */
__u32 kbrm2_session_key;
} __packed;
/* Kfilnd message. Includes base transport header plus embedded protocol
* message.
*/
struct kfilnd_msg {
/* Unique kfilnd magic. */
__u32 magic;
/* Version of the kfilnd protocol. */
__u16 version;
/* Specific kfilnd protocol type. */
__u8 type;
/* Unused 8 bits. */
__u8 reserved;
/* Number of bytes in message. */
__u16 nob;
/* Checksum of entire message. 0 is checksum disabled. */
__sum16 cksum;
/* Message LNet source NID. */
__u64 srcnid;
/* Message LNet target NID. */
__u64 dstnid;
/* Embedded protocol headers. Must remain at bottom. */
union {
struct kfilnd_immed_msg immed;
struct kfilnd_bulk_req_msg bulk_req;
struct kfilnd_hello_msg hello;
struct kfilnd_bulk_req_msg_v2 bulk_req_v2;
} __packed proto;
} __packed;
#define KFILND_MSG_MAGIC LNET_PROTO_KFI_MAGIC /* unique magic */
#define KFILND_MSG_VERSION_1 0x1
#define KFILND_MSG_VERSION_2 0x2
#define KFILND_MSG_VERSION KFILND_MSG_VERSION_2
/* Get the KFI RX context from a KFI RX address. RX context information is
* stored in the MSBs of the KFI address.
*/
#define KFILND_RX_CONTEXT(addr) ((addr) >> (64 - KFILND_FAB_RX_CTX_BITS))
#define KFILND_EP_DEBUG(ep, fmt, ...) \
CDEBUG(D_NET, "%s:%d " fmt "\n", \
libcfs_nidstr(&(ep)->end_dev->kfd_ni->ni_nid), \
(ep)->end_context_id, ##__VA_ARGS__)
#define KFILND_EP_ERROR(ep, fmt, ...) \
CNETERR("%s:%d " fmt "\n", \
libcfs_nidstr(&(ep)->end_dev->kfd_ni->ni_nid), \
(ep)->end_context_id, ##__VA_ARGS__)
#define KFILND_TN_PEER_VALID(tn) \
!IS_ERR_OR_NULL((tn)->tn_kp)
#define KFILND_TN_DIR_DEBUG(tn, fmt, dir, ...) \
CDEBUG(D_NET, "%s TN %p: %s:%u %s %s(%p):0x%llx lsk %u rsk %u tsk %u trmk %u tmk %u trr %u tta 0x%llx " fmt "\n", \
msg_type_to_str(tn->msg_type), \
(tn), \
libcfs_nidstr(&(tn)->tn_ep->end_dev->kfd_ni->ni_nid), \
(tn)->tn_ep->end_context_id, \
dir, \
libcfs_nid2str((tn)->tn_kp->kp_nid), \
(tn)->tn_kp, \
KFILND_RX_CONTEXT((tn)->tn_kp->kp_addr), \
(tn)->tn_kp->kp_local_session_key, \
(tn)->tn_kp->kp_remote_session_key, \
(tn)->tn_response_session_key, \
(tn)->tn_response_mr_key, \
(tn)->tn_mr_key, \
(tn)->tn_response_rx, \
(tn)->tn_target_addr, \
##__VA_ARGS__)
#define KFILND_TN_DEBUG(tn, fmt, ...) \
do { \
if ((tn)->is_initiator) \
KFILND_TN_DIR_DEBUG(tn, fmt, "->", ##__VA_ARGS__); \
else \
KFILND_TN_DIR_DEBUG(tn, fmt, "<-", ##__VA_ARGS__); \
} while (0)
#define KFILND_TN_DIR_ERROR(tn, fmt, dir, ...) \
CNETERR("TN %p: %s:%u %s %s(%p):0x%llx " fmt "\n", \
(tn), \
libcfs_nidstr(&(tn)->tn_ep->end_dev->kfd_ni->ni_nid), \
(tn)->tn_ep->end_context_id, dir, \
libcfs_nid2str((tn)->tn_kp->kp_nid), tn->tn_kp, \
KFILND_TN_PEER_VALID(tn) ? \
KFILND_RX_CONTEXT((tn)->tn_kp->kp_addr) : 0, \
##__VA_ARGS__)
#define KFILND_TN_ERROR(tn, fmt, ...) \
do { \
if ((tn)->is_initiator) \
KFILND_TN_DIR_ERROR(tn, fmt, "->", ##__VA_ARGS__); \
else \
KFILND_TN_DIR_ERROR(tn, fmt, "<-", ##__VA_ARGS__); \
} while (0)
/* TODO: Support NOOPs? */
enum kfilnd_msg_type {
/* Valid message types start at 1. */
KFILND_MSG_INVALID,
/* Valid message types. */
KFILND_MSG_IMMEDIATE,
KFILND_MSG_BULK_PUT_REQ,
KFILND_MSG_BULK_GET_REQ,
KFILND_MSG_HELLO_REQ,
KFILND_MSG_HELLO_RSP,
/* Invalid max value. */
KFILND_MSG_MAX,
};
static inline const char *msg_type_to_str(enum kfilnd_msg_type type)
{
static const char *str[KFILND_MSG_MAX] = {
[KFILND_MSG_INVALID] = "KFILND_MSG_INVALID",
[KFILND_MSG_IMMEDIATE] = "KFILND_MSG_IMMEDIATE",
[KFILND_MSG_BULK_PUT_REQ] = "KFILND_MSG_BULK_PUT_REQ",
[KFILND_MSG_BULK_GET_REQ] = "KFILND_MSG_BULK_GET_REQ",
[KFILND_MSG_HELLO_REQ] = "KFILND_MSG_HELLO_REQ",
[KFILND_MSG_HELLO_RSP] = "KFILND_MSG_HELLO_RSP",
};
if (type >= KFILND_MSG_MAX)
return "KFILND_MSG_INVALID";
return str[type];
};
static inline const char *tn_state_to_str(enum tn_states type)
{
static const char *str[TN_STATE_MAX] = {
[TN_STATE_INVALID] = "TN_STATE_INVALID",
[TN_STATE_IDLE] = "TN_STATE_IDLE",
[TN_STATE_WAIT_TAG_COMP] = "TN_STATE_WAIT_TAG_COMP",
[TN_STATE_IMM_SEND] = "TN_STATE_IMM_SEND",
[TN_STATE_TAGGED_RECV_POSTED] = "TN_STATE_TAGGED_RECV_POSTED",
[TN_STATE_SEND_FAILED] = "TN_STATE_SEND_FAILED",
[TN_STATE_WAIT_COMP] = "TN_STATE_WAIT_COMP",
[TN_STATE_WAIT_TIMEOUT_COMP] = "TN_STATE_WAIT_TIMEOUT_COMP",
[TN_STATE_WAIT_SEND_COMP] = "TN_STATE_WAIT_SEND_COMP",
[TN_STATE_WAIT_TIMEOUT_TAG_COMP] = "TN_STATE_WAIT_TIMEOUT_TAG_COMP",
[TN_STATE_FAIL] = "TN_STATE_FAIL",
[TN_STATE_IMM_RECV] = "TN_STATE_IMM_RECV",
[TN_STATE_WAIT_TAG_RMA_COMP] = "TN_STATE_WAIT_TAG_RMA_COMP",
};
return str[type];
};
/* Transaction Events */
enum tn_events {
TN_EVENT_INVALID,
/* Initiator events. */
TN_EVENT_INIT_IMMEDIATE,
TN_EVENT_INIT_BULK,
TN_EVENT_TX_HELLO,
TN_EVENT_TX_OK,
TN_EVENT_TX_FAIL,
TN_EVENT_TAG_RX_OK,
TN_EVENT_TAG_RX_FAIL,
TN_EVENT_TAG_RX_CANCEL,
TN_EVENT_TIMEOUT,
/* Target events. */
TN_EVENT_RX_HELLO,
TN_EVENT_RX_OK,
TN_EVENT_RX_FAIL,
TN_EVENT_INIT_TAG_RMA,
TN_EVENT_SKIP_TAG_RMA,
TN_EVENT_TAG_TX_OK,
TN_EVENT_TAG_TX_FAIL,
/* Invalid max value. */
TN_EVENT_MAX,
};
static inline const char *tn_event_to_str(enum tn_events type)
{
static const char *str[TN_EVENT_MAX] = {
[TN_EVENT_INVALID] = "TN_EVENT_INVALID",
[TN_EVENT_INIT_IMMEDIATE] = "TN_EVENT_INIT_IMMEDIATE",
[TN_EVENT_INIT_BULK] = "TN_EVENT_INIT_BULK",
[TN_EVENT_TX_HELLO] = "TN_EVENT_TX_HELLO",
[TN_EVENT_TX_OK] = "TN_EVENT_TX_OK",
[TN_EVENT_TX_FAIL] = "TN_EVENT_TX_FAIL",
[TN_EVENT_TAG_RX_OK] = "TN_EVENT_TAG_RX_OK",
[TN_EVENT_TAG_RX_FAIL] = "TN_EVENT_TAG_RX_FAIL",
[TN_EVENT_TAG_RX_CANCEL] = "TN_EVENT_TAG_RX_CANCEL",
[TN_EVENT_TIMEOUT] = "TN_EVENT_TIMEOUT",
[TN_EVENT_RX_HELLO] = "TN_EVENT_RX_HELLO",
[TN_EVENT_RX_OK] = "TN_EVENT_RX_OK",
[TN_EVENT_RX_FAIL] = "TN_EVENT_RX_FAIL",
[TN_EVENT_INIT_TAG_RMA] = "TN_EVENT_INIT_TAG_RMA",
[TN_EVENT_SKIP_TAG_RMA] = "TN_EVENT_SKIP_TAG_RMA",
[TN_EVENT_TAG_TX_OK] = "TN_EVENT_TAG_TX_OK",
[TN_EVENT_TAG_TX_FAIL] = "TN_EVENT_TAG_TX_FAIL",
};
return str[type];
};
struct kfilnd_transaction_msg {
struct kfilnd_msg *msg;
size_t length;
};
/* Initiator and target transaction structure. */
struct kfilnd_transaction {
/* Endpoint list transaction lives on. */
struct list_head tn_entry;
struct mutex tn_lock; /* to serialize events */
int tn_status; /* return code from ops */
struct kfilnd_ep *tn_ep; /* endpoint we operate under */
enum tn_states tn_state; /* current state of Tn */
struct lnet_msg *tn_lntmsg; /* LNet msg to finalize */
struct lnet_msg *tn_getreply; /* GET LNet msg to finalize */
bool is_initiator; /* Initiated LNet transfer. */
bool tn_early_rx; /* Indicates RX arrived before peer
* handshake
*/
/* Transaction send message and target address. */
kfi_addr_t tn_target_addr;
struct kfilnd_peer *tn_kp;
struct kfilnd_transaction_msg tn_tx_msg;
/* Transaction multi-receive buffer and associated receive message. */
struct kfilnd_immediate_buffer *tn_posted_buf;
struct kfilnd_transaction_msg tn_rx_msg;
/* LNet buffer used to register a memory region or perform a RMA
* operation.
*/
#ifdef HAVE_KFI_SGL
/* Set to true if @tn_sgt is mapped */
bool tn_sgt_mapped;
struct sg_table tn_sgt;
/* The number of segments originally allocated */
unsigned int tn_sgt_alloc_nents;
enum dma_data_direction tn_dmadir;
#else
struct bio_vec tn_kiov[LNET_MAX_IOV];
unsigned int tn_num_iovec;
#endif
/* Force RDMA */
bool tn_gpu;
/* LNet transaction payload byte count. */
unsigned int tn_nob;
/* Bulk transaction buffer is sink or source buffer. */
bool sink_buffer;
/* Memory region and remote key used to cover initiator's buffer. */
u16 tn_mr_key;
/* RX context used to perform response operations to a Put/Get
* request. This is required since the request initiator locks in a
* transactions to a specific RX context.
*/
u16 tn_response_mr_key;
u8 tn_response_rx;
u32 tn_response_session_key;
/* Immediate data used to convey transaction state from LNet target to
* LNet intiator.
*/
u64 tagged_data;
/* Bulk operation timeout timer. */
struct timer_list timeout_timer;
struct work_struct timeout_work;
/* Transaction health status. */
enum lnet_msg_hstatus hstatus;
/* Transaction deadline. */
ktime_t deadline;
/* Transaction replay deadline. */
ktime_t tn_replay_deadline;
ktime_t tn_alloc_ts;
ktime_t tn_state_ts;
size_t lnet_msg_len;
/* Fields used to replay transaction. */
struct list_head replay_entry;
enum tn_events replay_event;
int replay_status;
enum kfilnd_msg_type msg_type;
};
int kfilnd_send_hello_request(struct kfilnd_dev *dev, int cpt,
struct kfilnd_peer *kp);
#endif /* _KFILND_ */
