407 lines
11 KiB
C
407 lines
11 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* RDMA Transport Layer
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*
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* Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
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* Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
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* Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
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*/
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#ifndef RTRS_PRI_H
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#define RTRS_PRI_H
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#include <linux/uuid.h>
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#include <rdma/rdma_cm.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/ib.h>
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#include "rtrs.h"
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#define RTRS_PROTO_VER_MAJOR 2
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#define RTRS_PROTO_VER_MINOR 0
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#define RTRS_PROTO_VER_STRING __stringify(RTRS_PROTO_VER_MAJOR) "." \
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__stringify(RTRS_PROTO_VER_MINOR)
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/*
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* Max IB immediate data size is 2^28 (MAX_IMM_PAYL_BITS)
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* and the minimum chunk size is 4096 (2^12).
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* So the maximum sess_queue_depth is 65535 (2^16 - 1) in theory
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* since queue_depth in rtrs_msg_conn_rsp is defined as le16.
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* Therefore the pratical max value of sess_queue_depth is
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* somewhere between 1 and 65535 and it depends on the system.
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*/
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#define MAX_SESS_QUEUE_DEPTH 65535
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enum rtrs_imm_const {
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MAX_IMM_TYPE_BITS = 4,
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MAX_IMM_TYPE_MASK = ((1 << MAX_IMM_TYPE_BITS) - 1),
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MAX_IMM_PAYL_BITS = 28,
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MAX_IMM_PAYL_MASK = ((1 << MAX_IMM_PAYL_BITS) - 1),
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};
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enum rtrs_imm_type {
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RTRS_IO_REQ_IMM = 0, /* client to server */
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RTRS_IO_RSP_IMM = 1, /* server to client */
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RTRS_IO_RSP_W_INV_IMM = 2, /* server to client */
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RTRS_HB_MSG_IMM = 8, /* HB: HeartBeat */
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RTRS_HB_ACK_IMM = 9,
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RTRS_LAST_IMM,
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};
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enum {
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SERVICE_CON_QUEUE_DEPTH = 512,
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MAX_PATHS_NUM = 128,
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MIN_CHUNK_SIZE = 8192,
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RTRS_HB_INTERVAL_MS = 5000,
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RTRS_HB_MISSED_MAX = 5,
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RTRS_MAGIC = 0x1BBD,
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RTRS_PROTO_VER = (RTRS_PROTO_VER_MAJOR << 8) | RTRS_PROTO_VER_MINOR,
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};
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struct rtrs_ib_dev;
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struct rtrs_rdma_dev_pd_ops {
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int (*init)(struct rtrs_ib_dev *dev);
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};
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struct rtrs_rdma_dev_pd {
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struct mutex mutex;
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struct list_head list;
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enum ib_pd_flags pd_flags;
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const struct rtrs_rdma_dev_pd_ops *ops;
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};
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struct rtrs_ib_dev {
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struct ib_device *ib_dev;
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struct ib_pd *ib_pd;
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struct kref ref;
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struct list_head entry;
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struct rtrs_rdma_dev_pd *pool;
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};
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struct rtrs_con {
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struct rtrs_path *path;
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struct ib_qp *qp;
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struct ib_cq *cq;
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struct rdma_cm_id *cm_id;
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unsigned int cid;
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int nr_cqe;
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atomic_t wr_cnt;
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atomic_t sq_wr_avail;
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};
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struct rtrs_path {
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struct list_head entry;
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struct sockaddr_storage dst_addr;
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struct sockaddr_storage src_addr;
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char sessname[NAME_MAX];
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uuid_t uuid;
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struct rtrs_con **con;
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unsigned int con_num;
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unsigned int irq_con_num;
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unsigned int recon_cnt;
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unsigned int signal_interval;
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struct rtrs_ib_dev *dev;
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int dev_ref;
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struct ib_cqe *hb_cqe;
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void (*hb_err_handler)(struct rtrs_con *con);
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struct workqueue_struct *hb_wq;
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struct delayed_work hb_dwork;
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unsigned int hb_interval_ms;
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unsigned int hb_missed_cnt;
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unsigned int hb_missed_max;
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ktime_t hb_last_sent;
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ktime_t hb_cur_latency;
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};
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/* rtrs information unit */
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struct rtrs_iu {
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struct ib_cqe cqe;
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dma_addr_t dma_addr;
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void *buf;
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size_t size;
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enum dma_data_direction direction;
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};
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/**
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* enum rtrs_msg_types - RTRS message types, see also rtrs/README
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* @RTRS_MSG_INFO_REQ: Client additional info request to the server
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* @RTRS_MSG_INFO_RSP: Server additional info response to the client
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* @RTRS_MSG_WRITE: Client writes data per RDMA to server
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* @RTRS_MSG_READ: Client requests data transfer from server
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* @RTRS_MSG_RKEY_RSP: Server refreshed rkey for rbuf
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*/
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enum rtrs_msg_types {
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RTRS_MSG_INFO_REQ,
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RTRS_MSG_INFO_RSP,
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RTRS_MSG_WRITE,
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RTRS_MSG_READ,
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RTRS_MSG_RKEY_RSP,
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};
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/**
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* enum rtrs_msg_flags - RTRS message flags.
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* @RTRS_NEED_INVAL: Send invalidation in response.
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* @RTRS_MSG_NEW_RKEY_F: Send refreshed rkey in response.
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*/
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enum rtrs_msg_flags {
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RTRS_MSG_NEED_INVAL_F = 1 << 0,
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RTRS_MSG_NEW_RKEY_F = 1 << 1,
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};
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/**
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* struct rtrs_sg_desc - RDMA-Buffer entry description
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* @addr: Address of RDMA destination buffer
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* @key: Authorization rkey to write to the buffer
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* @len: Size of the buffer
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*/
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struct rtrs_sg_desc {
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__le64 addr;
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__le32 key;
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__le32 len;
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};
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/**
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* struct rtrs_msg_conn_req - Client connection request to the server
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* @magic: RTRS magic
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* @version: RTRS protocol version
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* @cid: Current connection id
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* @cid_num: Number of connections per session
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* @recon_cnt: Reconnections counter
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* @sess_uuid: UUID of a session (path)
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* @paths_uuid: UUID of a group of sessions (paths)
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*
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* NOTE: max size 56 bytes, see man rdma_connect().
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*/
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struct rtrs_msg_conn_req {
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/* Is set to 0 by cma.c in case of AF_IB, do not touch that.
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* see https://www.spinics.net/lists/linux-rdma/msg22397.html
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*/
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u8 __cma_version;
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/* On sender side that should be set to 0, or cma_save_ip_info()
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* extract garbage and will fail.
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*/
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u8 __ip_version;
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__le16 magic;
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__le16 version;
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__le16 cid;
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__le16 cid_num;
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__le16 recon_cnt;
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uuid_t sess_uuid;
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uuid_t paths_uuid;
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u8 first_conn : 1;
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u8 reserved_bits : 7;
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u8 reserved[11];
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};
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/**
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* struct rtrs_msg_conn_rsp - Server connection response to the client
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* @magic: RTRS magic
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* @version: RTRS protocol version
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* @errno: If rdma_accept() then 0, if rdma_reject() indicates error
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* @queue_depth: max inflight messages (queue-depth) in this session
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* @max_io_size: max io size server supports
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* @max_hdr_size: max msg header size server supports
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*
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* NOTE: size is 56 bytes, max possible is 136 bytes, see man rdma_accept().
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*/
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struct rtrs_msg_conn_rsp {
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__le16 magic;
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__le16 version;
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__le16 errno;
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__le16 queue_depth;
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__le32 max_io_size;
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__le32 max_hdr_size;
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__le32 flags;
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u8 reserved[36];
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};
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/**
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* struct rtrs_msg_info_req
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* @type: @RTRS_MSG_INFO_REQ
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* @pathname: Path name chosen by client
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*/
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struct rtrs_msg_info_req {
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__le16 type;
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u8 pathname[NAME_MAX];
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u8 reserved[15];
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};
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/**
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* struct rtrs_msg_info_rsp
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* @type: @RTRS_MSG_INFO_RSP
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* @sg_cnt: Number of @desc entries
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* @desc: RDMA buffers where the client can write to server
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*/
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struct rtrs_msg_info_rsp {
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__le16 type;
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__le16 sg_cnt;
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u8 reserved[4];
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struct rtrs_sg_desc desc[];
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};
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/**
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* struct rtrs_msg_rkey_rsp
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* @type: @RTRS_MSG_RKEY_RSP
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* @buf_id: RDMA buf_id of the new rkey
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* @rkey: new remote key for RDMA buffers id from server
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*/
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struct rtrs_msg_rkey_rsp {
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__le16 type;
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__le16 buf_id;
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__le32 rkey;
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};
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/**
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* struct rtrs_msg_rdma_read - RDMA data transfer request from client
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* @type: always @RTRS_MSG_READ
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* @usr_len: length of user payload
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* @sg_cnt: number of @desc entries
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* @desc: RDMA buffers where the server can write the result to
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*/
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struct rtrs_msg_rdma_read {
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__le16 type;
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__le16 usr_len;
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__le16 flags;
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__le16 sg_cnt;
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struct rtrs_sg_desc desc[];
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};
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/**
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* struct_msg_rdma_write - Message transferred to server with RDMA-Write
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* @type: always @RTRS_MSG_WRITE
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* @usr_len: length of user payload
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*/
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struct rtrs_msg_rdma_write {
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__le16 type;
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__le16 usr_len;
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};
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/**
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* struct_msg_rdma_hdr - header for read or write request
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* @type: @RTRS_MSG_WRITE | @RTRS_MSG_READ
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*/
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struct rtrs_msg_rdma_hdr {
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__le16 type;
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};
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/* rtrs.c */
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struct rtrs_iu *rtrs_iu_alloc(u32 queue_num, size_t size, gfp_t t,
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struct ib_device *dev, enum dma_data_direction,
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void (*done)(struct ib_cq *cq, struct ib_wc *wc));
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void rtrs_iu_free(struct rtrs_iu *iu, struct ib_device *dev, u32 queue_num);
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int rtrs_iu_post_recv(struct rtrs_con *con, struct rtrs_iu *iu);
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int rtrs_iu_post_send(struct rtrs_con *con, struct rtrs_iu *iu, size_t size,
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struct ib_send_wr *head);
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int rtrs_iu_post_rdma_write_imm(struct rtrs_con *con, struct rtrs_iu *iu,
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struct ib_sge *sge, unsigned int num_sge,
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u32 rkey, u64 rdma_addr, u32 imm_data,
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enum ib_send_flags flags,
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struct ib_send_wr *head,
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struct ib_send_wr *tail);
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int rtrs_post_recv_empty(struct rtrs_con *con, struct ib_cqe *cqe);
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int rtrs_cq_qp_create(struct rtrs_path *path, struct rtrs_con *con,
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u32 max_send_sge, int cq_vector, int nr_cqe,
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u32 max_send_wr, u32 max_recv_wr,
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enum ib_poll_context poll_ctx);
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void rtrs_cq_qp_destroy(struct rtrs_con *con);
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void rtrs_init_hb(struct rtrs_path *path, struct ib_cqe *cqe,
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unsigned int interval_ms, unsigned int missed_max,
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void (*err_handler)(struct rtrs_con *con),
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struct workqueue_struct *wq);
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void rtrs_start_hb(struct rtrs_path *path);
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void rtrs_stop_hb(struct rtrs_path *path);
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void rtrs_send_hb_ack(struct rtrs_path *path);
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void rtrs_rdma_dev_pd_init(enum ib_pd_flags pd_flags,
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struct rtrs_rdma_dev_pd *pool);
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void rtrs_rdma_dev_pd_deinit(struct rtrs_rdma_dev_pd *pool);
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struct rtrs_ib_dev *rtrs_ib_dev_find_or_add(struct ib_device *ib_dev,
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struct rtrs_rdma_dev_pd *pool);
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int rtrs_ib_dev_put(struct rtrs_ib_dev *dev);
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static inline u32 rtrs_to_imm(u32 type, u32 payload)
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{
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BUILD_BUG_ON(MAX_IMM_PAYL_BITS + MAX_IMM_TYPE_BITS != 32);
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BUILD_BUG_ON(RTRS_LAST_IMM > (1<<MAX_IMM_TYPE_BITS));
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return ((type & MAX_IMM_TYPE_MASK) << MAX_IMM_PAYL_BITS) |
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(payload & MAX_IMM_PAYL_MASK);
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}
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static inline void rtrs_from_imm(u32 imm, u32 *type, u32 *payload)
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{
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*payload = imm & MAX_IMM_PAYL_MASK;
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*type = imm >> MAX_IMM_PAYL_BITS;
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}
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static inline u32 rtrs_to_io_req_imm(u32 addr)
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{
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return rtrs_to_imm(RTRS_IO_REQ_IMM, addr);
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}
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|
|
|
||
|
|
static inline u32 rtrs_to_io_rsp_imm(u32 msg_id, int errno, bool w_inval)
|
||
|
|
{
|
||
|
|
enum rtrs_imm_type type;
|
||
|
|
u32 payload;
|
||
|
|
|
||
|
|
/* 9 bits for errno, 19 bits for msg_id */
|
||
|
|
payload = (abs(errno) & 0x1ff) << 19 | (msg_id & 0x7ffff);
|
||
|
|
type = w_inval ? RTRS_IO_RSP_W_INV_IMM : RTRS_IO_RSP_IMM;
|
||
|
|
|
||
|
|
return rtrs_to_imm(type, payload);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void rtrs_from_io_rsp_imm(u32 payload, u32 *msg_id, int *errno)
|
||
|
|
{
|
||
|
|
/* 9 bits for errno, 19 bits for msg_id */
|
||
|
|
*msg_id = payload & 0x7ffff;
|
||
|
|
*errno = -(int)((payload >> 19) & 0x1ff);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define STAT_STORE_FUNC(type, set_value, reset) \
|
||
|
|
static ssize_t set_value##_store(struct kobject *kobj, \
|
||
|
|
struct kobj_attribute *attr, \
|
||
|
|
const char *buf, size_t count) \
|
||
|
|
{ \
|
||
|
|
int ret = -EINVAL; \
|
||
|
|
type *stats = container_of(kobj, type, kobj_stats); \
|
||
|
|
\
|
||
|
|
if (sysfs_streq(buf, "1")) \
|
||
|
|
ret = reset(stats, true); \
|
||
|
|
else if (sysfs_streq(buf, "0")) \
|
||
|
|
ret = reset(stats, false); \
|
||
|
|
if (ret) \
|
||
|
|
return ret; \
|
||
|
|
\
|
||
|
|
return count; \
|
||
|
|
}
|
||
|
|
|
||
|
|
#define STAT_SHOW_FUNC(type, get_value, print) \
|
||
|
|
static ssize_t get_value##_show(struct kobject *kobj, \
|
||
|
|
struct kobj_attribute *attr, \
|
||
|
|
char *page) \
|
||
|
|
{ \
|
||
|
|
type *stats = container_of(kobj, type, kobj_stats); \
|
||
|
|
\
|
||
|
|
return print(stats, page); \
|
||
|
|
}
|
||
|
|
|
||
|
|
#define STAT_ATTR(type, stat, print, reset) \
|
||
|
|
STAT_STORE_FUNC(type, stat, reset) \
|
||
|
|
STAT_SHOW_FUNC(type, stat, print) \
|
||
|
|
static struct kobj_attribute stat##_attr = __ATTR_RW(stat)
|
||
|
|
|
||
|
|
#endif /* RTRS_PRI_H */
|