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399f9539d9
The upper layer calls this function to connect to peer through SMB Direct. Each SMB Direct connection is based on a RDMA RC Queue Pair. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
258 lines
6.5 KiB
C
258 lines
6.5 KiB
C
/*
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* Copyright (C) 2017, Microsoft Corporation.
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*
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* Author(s): Long Li <longli@microsoft.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*/
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#ifndef _SMBDIRECT_H
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#define _SMBDIRECT_H
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#ifdef CONFIG_CIFS_SMB_DIRECT
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#define cifs_rdma_enabled(server) ((server)->rdma)
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#include "cifsglob.h"
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <linux/mempool.h>
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enum keep_alive_status {
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KEEP_ALIVE_NONE,
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KEEP_ALIVE_PENDING,
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KEEP_ALIVE_SENT,
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};
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enum smbd_connection_status {
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SMBD_CREATED,
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SMBD_CONNECTING,
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SMBD_CONNECTED,
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SMBD_NEGOTIATE_FAILED,
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SMBD_DISCONNECTING,
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SMBD_DISCONNECTED,
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SMBD_DESTROYED
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};
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/*
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* The context for the SMBDirect transport
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* Everything related to the transport is here. It has several logical parts
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* 1. RDMA related structures
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* 2. SMBDirect connection parameters
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* 3. Memory registrations
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* 4. Receive and reassembly queues for data receive path
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* 5. mempools for allocating packets
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*/
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struct smbd_connection {
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enum smbd_connection_status transport_status;
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/* RDMA related */
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struct rdma_cm_id *id;
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struct ib_qp_init_attr qp_attr;
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struct ib_pd *pd;
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struct ib_cq *send_cq, *recv_cq;
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struct ib_device_attr dev_attr;
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int ri_rc;
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struct completion ri_done;
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wait_queue_head_t conn_wait;
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wait_queue_head_t wait_destroy;
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struct completion negotiate_completion;
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bool negotiate_done;
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struct work_struct destroy_work;
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struct work_struct disconnect_work;
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struct work_struct recv_done_work;
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struct work_struct post_send_credits_work;
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spinlock_t lock_new_credits_offered;
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int new_credits_offered;
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/* Connection parameters defined in [MS-SMBD] 3.1.1.1 */
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int receive_credit_max;
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int send_credit_target;
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int max_send_size;
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int max_fragmented_recv_size;
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int max_fragmented_send_size;
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int max_receive_size;
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int keep_alive_interval;
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int max_readwrite_size;
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enum keep_alive_status keep_alive_requested;
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int protocol;
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atomic_t send_credits;
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atomic_t receive_credits;
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int receive_credit_target;
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int fragment_reassembly_remaining;
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/* Activity accoutning */
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atomic_t send_pending;
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wait_queue_head_t wait_send_pending;
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atomic_t send_payload_pending;
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wait_queue_head_t wait_send_payload_pending;
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/* Receive queue */
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struct list_head receive_queue;
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int count_receive_queue;
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spinlock_t receive_queue_lock;
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struct list_head empty_packet_queue;
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int count_empty_packet_queue;
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spinlock_t empty_packet_queue_lock;
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wait_queue_head_t wait_receive_queues;
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/* Reassembly queue */
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struct list_head reassembly_queue;
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spinlock_t reassembly_queue_lock;
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wait_queue_head_t wait_reassembly_queue;
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/* total data length of reassembly queue */
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int reassembly_data_length;
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int reassembly_queue_length;
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/* the offset to first buffer in reassembly queue */
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int first_entry_offset;
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bool send_immediate;
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wait_queue_head_t wait_send_queue;
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/*
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* Indicate if we have received a full packet on the connection
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* This is used to identify the first SMBD packet of a assembled
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* payload (SMB packet) in reassembly queue so we can return a
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* RFC1002 length to upper layer to indicate the length of the SMB
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* packet received
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*/
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bool full_packet_received;
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struct workqueue_struct *workqueue;
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struct delayed_work idle_timer_work;
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struct delayed_work send_immediate_work;
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/* Memory pool for preallocating buffers */
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/* request pool for RDMA send */
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struct kmem_cache *request_cache;
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mempool_t *request_mempool;
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/* response pool for RDMA receive */
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struct kmem_cache *response_cache;
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mempool_t *response_mempool;
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/* for debug purposes */
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unsigned int count_get_receive_buffer;
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unsigned int count_put_receive_buffer;
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unsigned int count_reassembly_queue;
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unsigned int count_enqueue_reassembly_queue;
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unsigned int count_dequeue_reassembly_queue;
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unsigned int count_send_empty;
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};
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enum smbd_message_type {
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SMBD_NEGOTIATE_RESP,
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SMBD_TRANSFER_DATA,
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};
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#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001
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/* SMBD negotiation request packet [MS-SMBD] 2.2.1 */
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struct smbd_negotiate_req {
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__le16 min_version;
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__le16 max_version;
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__le16 reserved;
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__le16 credits_requested;
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__le32 preferred_send_size;
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__le32 max_receive_size;
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__le32 max_fragmented_size;
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} __packed;
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/* SMBD negotiation response packet [MS-SMBD] 2.2.2 */
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struct smbd_negotiate_resp {
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__le16 min_version;
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__le16 max_version;
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__le16 negotiated_version;
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__le16 reserved;
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__le16 credits_requested;
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__le16 credits_granted;
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__le32 status;
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__le32 max_readwrite_size;
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__le32 preferred_send_size;
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__le32 max_receive_size;
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__le32 max_fragmented_size;
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} __packed;
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/* SMBD data transfer packet with payload [MS-SMBD] 2.2.3 */
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struct smbd_data_transfer {
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__le16 credits_requested;
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__le16 credits_granted;
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__le16 flags;
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__le16 reserved;
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__le32 remaining_data_length;
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__le32 data_offset;
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__le32 data_length;
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__le32 padding;
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__u8 buffer[];
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} __packed;
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/* The packet fields for a registered RDMA buffer */
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struct smbd_buffer_descriptor_v1 {
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__le64 offset;
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__le32 token;
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__le32 length;
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} __packed;
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/* Default maximum number of SGEs in a RDMA send/recv */
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#define SMBDIRECT_MAX_SGE 16
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/* The context for a SMBD request */
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struct smbd_request {
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struct smbd_connection *info;
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struct ib_cqe cqe;
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/* true if this request carries upper layer payload */
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bool has_payload;
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/* the SGE entries for this packet */
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struct ib_sge sge[SMBDIRECT_MAX_SGE];
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int num_sge;
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/* SMBD packet header follows this structure */
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u8 packet[];
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};
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/* The context for a SMBD response */
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struct smbd_response {
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struct smbd_connection *info;
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struct ib_cqe cqe;
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struct ib_sge sge;
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enum smbd_message_type type;
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/* Link to receive queue or reassembly queue */
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struct list_head list;
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/* Indicate if this is the 1st packet of a payload */
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bool first_segment;
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/* SMBD packet header and payload follows this structure */
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u8 packet[];
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};
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/* Create a SMBDirect session */
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struct smbd_connection *smbd_get_connection(
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struct TCP_Server_Info *server, struct sockaddr *dstaddr);
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#else
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#define cifs_rdma_enabled(server) 0
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struct smbd_connection {};
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static inline void *smbd_get_connection(
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struct TCP_Server_Info *server, struct sockaddr *dstaddr) {return NULL;}
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#endif
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#endif
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