317 lines
8.2 KiB
C
317 lines
8.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (C) 2017, Microsoft Corporation.
|
|
*
|
|
* Author(s): Long Li <longli@microsoft.com>
|
|
*/
|
|
#ifndef _SMBDIRECT_H
|
|
#define _SMBDIRECT_H
|
|
|
|
#ifdef CONFIG_CIFS_SMB_DIRECT
|
|
#define cifs_rdma_enabled(server) ((server)->rdma)
|
|
|
|
#include "cifsglob.h"
|
|
#include <rdma/ib_verbs.h>
|
|
#include <rdma/rdma_cm.h>
|
|
#include <linux/mempool.h>
|
|
|
|
extern int rdma_readwrite_threshold;
|
|
extern int smbd_max_frmr_depth;
|
|
extern int smbd_keep_alive_interval;
|
|
extern int smbd_max_receive_size;
|
|
extern int smbd_max_fragmented_recv_size;
|
|
extern int smbd_max_send_size;
|
|
extern int smbd_send_credit_target;
|
|
extern int smbd_receive_credit_max;
|
|
|
|
enum keep_alive_status {
|
|
KEEP_ALIVE_NONE,
|
|
KEEP_ALIVE_PENDING,
|
|
KEEP_ALIVE_SENT,
|
|
};
|
|
|
|
enum smbd_connection_status {
|
|
SMBD_CREATED,
|
|
SMBD_CONNECTING,
|
|
SMBD_CONNECTED,
|
|
SMBD_NEGOTIATE_FAILED,
|
|
SMBD_DISCONNECTING,
|
|
SMBD_DISCONNECTED,
|
|
SMBD_DESTROYED
|
|
};
|
|
|
|
/*
|
|
* The context for the SMBDirect transport
|
|
* Everything related to the transport is here. It has several logical parts
|
|
* 1. RDMA related structures
|
|
* 2. SMBDirect connection parameters
|
|
* 3. Memory registrations
|
|
* 4. Receive and reassembly queues for data receive path
|
|
* 5. mempools for allocating packets
|
|
*/
|
|
struct smbd_connection {
|
|
enum smbd_connection_status transport_status;
|
|
|
|
/* RDMA related */
|
|
struct rdma_cm_id *id;
|
|
struct ib_qp_init_attr qp_attr;
|
|
struct ib_pd *pd;
|
|
struct ib_cq *send_cq, *recv_cq;
|
|
struct ib_device_attr dev_attr;
|
|
int ri_rc;
|
|
struct completion ri_done;
|
|
wait_queue_head_t conn_wait;
|
|
wait_queue_head_t disconn_wait;
|
|
|
|
struct completion negotiate_completion;
|
|
bool negotiate_done;
|
|
|
|
struct work_struct disconnect_work;
|
|
struct work_struct post_send_credits_work;
|
|
|
|
spinlock_t lock_new_credits_offered;
|
|
int new_credits_offered;
|
|
|
|
/* Connection parameters defined in [MS-SMBD] 3.1.1.1 */
|
|
int receive_credit_max;
|
|
int send_credit_target;
|
|
int max_send_size;
|
|
int max_fragmented_recv_size;
|
|
int max_fragmented_send_size;
|
|
int max_receive_size;
|
|
int keep_alive_interval;
|
|
int max_readwrite_size;
|
|
enum keep_alive_status keep_alive_requested;
|
|
int protocol;
|
|
atomic_t send_credits;
|
|
atomic_t receive_credits;
|
|
int receive_credit_target;
|
|
int fragment_reassembly_remaining;
|
|
|
|
/* Memory registrations */
|
|
/* Maximum number of RDMA read/write outstanding on this connection */
|
|
int responder_resources;
|
|
/* Maximum number of SGEs in a RDMA write/read */
|
|
int max_frmr_depth;
|
|
/*
|
|
* If payload is less than or equal to the threshold,
|
|
* use RDMA send/recv to send upper layer I/O.
|
|
* If payload is more than the threshold,
|
|
* use RDMA read/write through memory registration for I/O.
|
|
*/
|
|
int rdma_readwrite_threshold;
|
|
enum ib_mr_type mr_type;
|
|
struct list_head mr_list;
|
|
spinlock_t mr_list_lock;
|
|
/* The number of available MRs ready for memory registration */
|
|
atomic_t mr_ready_count;
|
|
atomic_t mr_used_count;
|
|
wait_queue_head_t wait_mr;
|
|
struct work_struct mr_recovery_work;
|
|
/* Used by transport to wait until all MRs are returned */
|
|
wait_queue_head_t wait_for_mr_cleanup;
|
|
|
|
/* Activity accoutning */
|
|
atomic_t send_pending;
|
|
wait_queue_head_t wait_send_pending;
|
|
wait_queue_head_t wait_post_send;
|
|
|
|
/* Receive queue */
|
|
struct list_head receive_queue;
|
|
int count_receive_queue;
|
|
spinlock_t receive_queue_lock;
|
|
|
|
struct list_head empty_packet_queue;
|
|
int count_empty_packet_queue;
|
|
spinlock_t empty_packet_queue_lock;
|
|
|
|
wait_queue_head_t wait_receive_queues;
|
|
|
|
/* Reassembly queue */
|
|
struct list_head reassembly_queue;
|
|
spinlock_t reassembly_queue_lock;
|
|
wait_queue_head_t wait_reassembly_queue;
|
|
|
|
/* total data length of reassembly queue */
|
|
int reassembly_data_length;
|
|
int reassembly_queue_length;
|
|
/* the offset to first buffer in reassembly queue */
|
|
int first_entry_offset;
|
|
|
|
bool send_immediate;
|
|
|
|
wait_queue_head_t wait_send_queue;
|
|
|
|
/*
|
|
* Indicate if we have received a full packet on the connection
|
|
* This is used to identify the first SMBD packet of a assembled
|
|
* payload (SMB packet) in reassembly queue so we can return a
|
|
* RFC1002 length to upper layer to indicate the length of the SMB
|
|
* packet received
|
|
*/
|
|
bool full_packet_received;
|
|
|
|
struct workqueue_struct *workqueue;
|
|
struct delayed_work idle_timer_work;
|
|
|
|
/* Memory pool for preallocating buffers */
|
|
/* request pool for RDMA send */
|
|
struct kmem_cache *request_cache;
|
|
mempool_t *request_mempool;
|
|
|
|
/* response pool for RDMA receive */
|
|
struct kmem_cache *response_cache;
|
|
mempool_t *response_mempool;
|
|
|
|
/* for debug purposes */
|
|
unsigned int count_get_receive_buffer;
|
|
unsigned int count_put_receive_buffer;
|
|
unsigned int count_reassembly_queue;
|
|
unsigned int count_enqueue_reassembly_queue;
|
|
unsigned int count_dequeue_reassembly_queue;
|
|
unsigned int count_send_empty;
|
|
};
|
|
|
|
enum smbd_message_type {
|
|
SMBD_NEGOTIATE_RESP,
|
|
SMBD_TRANSFER_DATA,
|
|
};
|
|
|
|
#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001
|
|
|
|
/* SMBD negotiation request packet [MS-SMBD] 2.2.1 */
|
|
struct smbd_negotiate_req {
|
|
__le16 min_version;
|
|
__le16 max_version;
|
|
__le16 reserved;
|
|
__le16 credits_requested;
|
|
__le32 preferred_send_size;
|
|
__le32 max_receive_size;
|
|
__le32 max_fragmented_size;
|
|
} __packed;
|
|
|
|
/* SMBD negotiation response packet [MS-SMBD] 2.2.2 */
|
|
struct smbd_negotiate_resp {
|
|
__le16 min_version;
|
|
__le16 max_version;
|
|
__le16 negotiated_version;
|
|
__le16 reserved;
|
|
__le16 credits_requested;
|
|
__le16 credits_granted;
|
|
__le32 status;
|
|
__le32 max_readwrite_size;
|
|
__le32 preferred_send_size;
|
|
__le32 max_receive_size;
|
|
__le32 max_fragmented_size;
|
|
} __packed;
|
|
|
|
/* SMBD data transfer packet with payload [MS-SMBD] 2.2.3 */
|
|
struct smbd_data_transfer {
|
|
__le16 credits_requested;
|
|
__le16 credits_granted;
|
|
__le16 flags;
|
|
__le16 reserved;
|
|
__le32 remaining_data_length;
|
|
__le32 data_offset;
|
|
__le32 data_length;
|
|
__le32 padding;
|
|
__u8 buffer[];
|
|
} __packed;
|
|
|
|
/* The packet fields for a registered RDMA buffer */
|
|
struct smbd_buffer_descriptor_v1 {
|
|
__le64 offset;
|
|
__le32 token;
|
|
__le32 length;
|
|
} __packed;
|
|
|
|
/* Default maximum number of SGEs in a RDMA send/recv */
|
|
#define SMBDIRECT_MAX_SGE 16
|
|
/* The context for a SMBD request */
|
|
struct smbd_request {
|
|
struct smbd_connection *info;
|
|
struct ib_cqe cqe;
|
|
|
|
/* the SGE entries for this packet */
|
|
struct ib_sge sge[SMBDIRECT_MAX_SGE];
|
|
int num_sge;
|
|
|
|
/* SMBD packet header follows this structure */
|
|
u8 packet[];
|
|
};
|
|
|
|
/* The context for a SMBD response */
|
|
struct smbd_response {
|
|
struct smbd_connection *info;
|
|
struct ib_cqe cqe;
|
|
struct ib_sge sge;
|
|
|
|
enum smbd_message_type type;
|
|
|
|
/* Link to receive queue or reassembly queue */
|
|
struct list_head list;
|
|
|
|
/* Indicate if this is the 1st packet of a payload */
|
|
bool first_segment;
|
|
|
|
/* SMBD packet header and payload follows this structure */
|
|
u8 packet[];
|
|
};
|
|
|
|
/* Create a SMBDirect session */
|
|
struct smbd_connection *smbd_get_connection(
|
|
struct TCP_Server_Info *server, struct sockaddr *dstaddr);
|
|
|
|
/* Reconnect SMBDirect session */
|
|
int smbd_reconnect(struct TCP_Server_Info *server);
|
|
/* Destroy SMBDirect session */
|
|
void smbd_destroy(struct TCP_Server_Info *server);
|
|
|
|
/* Interface for carrying upper layer I/O through send/recv */
|
|
int smbd_recv(struct smbd_connection *info, struct msghdr *msg);
|
|
int smbd_send(struct TCP_Server_Info *server,
|
|
int num_rqst, struct smb_rqst *rqst);
|
|
|
|
enum mr_state {
|
|
MR_READY,
|
|
MR_REGISTERED,
|
|
MR_INVALIDATED,
|
|
MR_ERROR
|
|
};
|
|
|
|
struct smbd_mr {
|
|
struct smbd_connection *conn;
|
|
struct list_head list;
|
|
enum mr_state state;
|
|
struct ib_mr *mr;
|
|
struct scatterlist *sgl;
|
|
int sgl_count;
|
|
enum dma_data_direction dir;
|
|
union {
|
|
struct ib_reg_wr wr;
|
|
struct ib_send_wr inv_wr;
|
|
};
|
|
struct ib_cqe cqe;
|
|
bool need_invalidate;
|
|
struct completion invalidate_done;
|
|
};
|
|
|
|
/* Interfaces to register and deregister MR for RDMA read/write */
|
|
struct smbd_mr *smbd_register_mr(
|
|
struct smbd_connection *info, struct page *pages[], int num_pages,
|
|
int offset, int tailsz, bool writing, bool need_invalidate);
|
|
int smbd_deregister_mr(struct smbd_mr *mr);
|
|
|
|
#else
|
|
#define cifs_rdma_enabled(server) 0
|
|
struct smbd_connection {};
|
|
static inline void *smbd_get_connection(
|
|
struct TCP_Server_Info *server, struct sockaddr *dstaddr) {return NULL;}
|
|
static inline int smbd_reconnect(struct TCP_Server_Info *server) {return -1; }
|
|
static inline void smbd_destroy(struct TCP_Server_Info *server) {}
|
|
static inline int smbd_recv(struct smbd_connection *info, struct msghdr *msg) {return -1; }
|
|
static inline int smbd_send(struct TCP_Server_Info *server, int num_rqst, struct smb_rqst *rqst) {return -1; }
|
|
#endif
|
|
|
|
#endif
|