文章目录
背景
本文介绍了与RDMA（远程直接内存访问）相关的多个库及其功能。首先，rdma-core-devel库提供了开发所需的头文件和库。其次，libibverbs库是RDMA的核心库，提供了与verbs相关的接口，包括计数器操作（创建、销毁和读取）。librdmacm库则提供了RDMA通信管理相关的头文件。libibumad库属于InfiniBand的用户空间管理数据报工具，而非RDMA域。此外，本文还介绍了几个工具库，如librdmacm-utils和libibverbs-utils，它们提供了如ucmatose、ibv_devinfo等实用工具，用于查询设备信息和限制参数（如最大QP、CQ、MR等）。这些库和工具为RDMA应用的开发和调试提供了重要支持。
x 各种lib库
x.1 rdma-core-devel udev等触发机制
头文件：
库：
早期ibdev2netdev也在rdma-core中：
x.2 libibverbs IB的verbs的库，最核心的库提供verbs
x.2.1 提供的头文件（cmake中）
x.2.2 ibverbs中counter相关的action
enum uverbs_methods_actions_counters_ops {
UVERBS_METHOD_COUNTERS_CREATE,
UVERBS_METHOD_COUNTERS_DESTROY,
UVERBS_METHOD_COUNTERS_READ,
};
3个action对应3个操作函数
x.3 librdmacm RDMACM的库CM建链相关
提供的头文件（cmake中）
x.4 libibumad
这个库是属于ib的umad，不是rdma域
Userspace Management Datagram，用户空间管理数据报
x.5 util类的库
x.5.1 librdmacm-utils 工具库 CM建链相关的
提供的工具，比如比较常用的ucmatose
x.5.2 libibverbs-utils工具
x.5.2.1 基础信息
提供ibv_devinfo和ibv_devices
比如：
x.5.2.2 ibv_devinfo的简单信息
该命令可以查看一些限制信息，比如：
max_qp
max_cq
max_mr
max_pd
max_mtu
[root@localhost ~]# ibv_devinfo -v
hca_id: mlx5_0
transport: InfiniBand (0)
fw_ver: 16.31.1014
node_guid: 08c0:eb03:00f4:e6a6
sys_image_guid: 08c0:eb03:00f4:e6a6
vendor_id: 0x02c9
vendor_part_id: 4119
hw_ver: 0x0
board_id: MT_0000000080
phys_port_cnt: 1
max_mr_size: 0xffffffffffffffff
page_size_cap: 0xfffffffffffff000
max_qp: 262144
max_qp_wr: 32768
device_cap_flags: 0x25321c36
BAD_PKEY_CNTR
BAD_QKEY_CNTR
AUTO_PATH_MIG
CHANGE_PHY_PORT
PORT_ACTIVE_EVENT
SYS_IMAGE_GUID
RC_RNR_NAK_GEN
MEM_WINDOW
XRC
MEM_MGT_EXTENSIONS
MEM_WINDOW_TYPE_2B
RAW_IP_CSUM
MANAGED_FLOW_STEERING
max_sge: 30
max_sge_rd: 30
max_cq: 16777216
max_cqe: 4194303
max_mr: 16777216
max_pd: 8388608
max_qp_rd_atom: 16
max_ee_rd_atom: 0
max_res_rd_atom: 4194304
max_qp_init_rd_atom: 16
max_ee_init_rd_atom: 0
atomic_cap: ATOMIC_HCA (1)
max_ee: 0
max_rdd: 0
max_mw: 16777216
max_raw_ipv6_qp: 0
max_raw_ethy_qp: 0
max_mcast_grp: 2097152
max_mcast_qp_attach: 240
max_total_mcast_qp_attach: 503316480
max_ah: 2147483647
max_fmr: 0
max_srq: 8388608
max_srq_wr: 32767
max_srq_sge: 31
max_pkeys: 128
local_ca_ack_delay: 16
general_odp_caps:
ODP_SUPPORT
ODP_SUPPORT_IMPLICIT
rc_odp_caps:
SUPPORT_SEND
SUPPORT_RECV
SUPPORT_WRITE
SUPPORT_READ
SUPPORT_SRQ
uc_odp_caps:
NO SUPPORT
ud_odp_caps:
SUPPORT_SEND
xrc_odp_caps:
SUPPORT_SEND
SUPPORT_WRITE
SUPPORT_READ
SUPPORT_SRQ
completion timestamp_mask: 0x7fffffffffffffff
hca_core_clock: 156250kHZ
raw packet caps:
C-VLAN stripping offload
Scatter FCS offload
IP csum offload
Delay drop
device_cap_flags_ex: 0x1425321C36
RAW_SCATTER_FCS
PCI_WRITE_END_PADDING
tso_caps:
max_tso: 262144
supported_qp:
SUPPORT_RAW_PACKET
rss_caps:
max_rwq_indirection_tables: 1048576
max_rwq_indirection_table_size: 2048
rx_hash_function: 0x1
rx_hash_fields_mask: 0x800000FF
supported_qp:
SUPPORT_RAW_PACKET
max_wq_type_rq: 8388608
packet_pacing_caps:
qp_rate_limit_min: 1kbps
qp_rate_limit_max: 25000000kbps
supported_qp:
SUPPORT_RAW_PACKET
tag matching not supported
cq moderation caps:
max_cq_count: 65535
max_cq_period: 4095 us
maximum available device memory: 131072Bytes
num_comp_vectors: 4
port: 1
state: PORT_ACTIVE (4)
max_mtu: 4096 (5)
active_mtu: 1024 (3)
sm_lid: 0
port_lid: 0
port_lmc: 0x00
link_layer: Ethernet
max_msg_sz: 0x40000000
port_cap_flags: 0x04010000
port_cap_flags2: 0x0000
max_vl_num: invalid value (0)
bad_pkey_cntr: 0x0
qkey_viol_cntr: 0x0
sm_sl: 0
pkey_tbl_len: 1
gid_tbl_len: 255
subnet_timeout: 0
init_type_reply: 0
active_width: 1X (1)
active_speed: 25.0 Gbps (32)
phys_state: LINK_UP (5)
GID[ 0]: fe80:0000:0000:0000:0ac0:ebff:fef4:e6a6, RoCE v1
GID[ 1]: fe80::ac0:ebff:fef4:e6a6, RoCE v2
hca_id: mlx5_1
transport: InfiniBand (0)
fw_ver: 16.31.1014
node_guid: 08c0:eb03:00f4:e6a7
sys_image_guid: 08c0:eb03:00f4:e6a6
vendor_id: 0x02c9
vendor_part_id: 4119
hw_ver: 0x0
board_id: MT_0000000080
phys_port_cnt: 1
max_mr_size: 0xffffffffffffffff
page_size_cap: 0xfffffffffffff000
max_qp: 262144
max_qp_wr: 32768
device_cap_flags: 0x25321c36
BAD_PKEY_CNTR
BAD_QKEY_CNTR
AUTO_PATH_MIG
CHANGE_PHY_PORT
PORT_ACTIVE_EVENT
SYS_IMAGE_GUID
RC_RNR_NAK_GEN
MEM_WINDOW
XRC
MEM_MGT_EXTENSIONS
MEM_WINDOW_TYPE_2B
RAW_IP_CSUM
MANAGED_FLOW_STEERING
max_sge: 30
max_sge_rd: 30
max_cq: 16777216
max_cqe: 4194303
max_mr: 16777216
max_pd: 8388608
max_qp_rd_atom: 16
max_ee_rd_atom: 0
max_res_rd_atom: 4194304
max_qp_init_rd_atom: 16
max_ee_init_rd_atom: 0
atomic_cap: ATOMIC_HCA (1)
max_ee: 0
max_rdd: 0
max_mw: 16777216
max_raw_ipv6_qp: 0
max_raw_ethy_qp: 0
max_mcast_grp: 2097152
max_mcast_qp_attach: 240
max_total_mcast_qp_attach: 503316480
max_ah: 2147483647
max_fmr: 0
max_srq: 8388608
max_srq_wr: 32767
max_srq_sge: 31
max_pkeys: 128
local_ca_ack_delay: 16
general_odp_caps:
ODP_SUPPORT
ODP_SUPPORT_IMPLICIT
rc_odp_caps:
SUPPORT_SEND
SUPPORT_RECV
SUPPORT_WRITE
SUPPORT_READ
SUPPORT_SRQ
uc_odp_caps:
NO SUPPORT
ud_odp_caps:
SUPPORT_SEND
xrc_odp_caps:
SUPPORT_SEND
SUPPORT_WRITE
SUPPORT_READ
SUPPORT_SRQ
completion timestamp_mask: 0x7fffffffffffffff
hca_core_clock: 156250kHZ
raw packet caps:
C-VLAN stripping offload
Scatter FCS offload
IP csum offload
Delay drop
device_cap_flags_ex: 0x1425321C36
RAW_SCATTER_FCS
PCI_WRITE_END_PADDING
tso_caps:
max_tso: 262144
supported_qp:
SUPPORT_RAW_PACKET
rss_caps:
max_rwq_indirection_tables: 1048576
max_rwq_indirection_table_size: 2048
rx_hash_function: 0x1
rx_hash_fields_mask: 0x800000FF
supported_qp:
SUPPORT_RAW_PACKET
max_wq_type_rq: 8388608
packet_pacing_caps:
qp_rate_limit_min: 1kbps
qp_rate_limit_max: 25000000kbps
supported_qp:
SUPPORT_RAW_PACKET
tag matching not supported
cq moderation caps:
max_cq_count: 65535
max_cq_period: 4095 us
maximum available device memory: 131072Bytes
num_comp_vectors: 4
port: 1
state: PORT_ACTIVE (4)
max_mtu: 4096 (5)
active_mtu: 1024 (3)
sm_lid: 0
port_lid: 0
port_lmc: 0x00
link_layer: Ethernet
max_msg_sz: 0x40000000
port_cap_flags: 0x04010000
port_cap_flags2: 0x0000
max_vl_num: invalid value (0)
bad_pkey_cntr: 0x0
qkey_viol_cntr: 0x0
sm_sl: 0
pkey_tbl_len: 1
gid_tbl_len: 255
subnet_timeout: 0
init_type_reply: 0
active_width: 1X (1)
active_speed: 25.0 Gbps (32)
phys_state: LINK_UP (5)
GID[ 0]: fe80:0000:0000:0000:0ac0:ebff:fef4:e6a7, RoCE v1
GID[ 1]: fe80::ac0:ebff:fef4:e6a7, RoCE v2
x.5.2.3 ibv_device的简单信息
[root@localhost ~]# ibv_devices -h
device node GUID
------ ----------------
mlx5_0 08c0eb0300f4e6a6
mlx5_1 08c0eb0300f4e6a7
x.5.3 infiniband-diags-compat的库 IB的调试工具库 不常用
提供的工具：
x.5.4 infiniband-diags IB的调试工具库，主要ibstat查看状态
可以看到
x.5.4.1 ibstatus 查看速率、端口、物理状态等
[root@localhost ~]# ibstatus
Infiniband device 'mlx5_0' port 1 status:
default gid: fe80:0000:0000:0000:0ac0:ebff:fef4:e6a6
base lid: 0x0
sm lid: 0x0
state: 4: ACTIVE
phys state: 5: LinkUp
rate: 25 Gb/sec (1X EDR)
link_layer: Ethernet
Infiniband device 'mlx5_1' port 1 status:
default gid: fe80:0000:0000:0000:0ac0:ebff:fef4:e6a7
base lid: 0x0
sm lid: 0x0
state: 4: ACTIVE
phys state: 5: LinkUp
rate: 25 Gb/sec (1X EDR)
link_layer: Ethernet
x.5.4.2 ibstat 查看型号、固件、速率、状态等
[root@localhost ~]# ibstat -v
CA 'mlx5_0'
CA type: MT4119
Number of ports: 1
Firmware version: 16.31.1014
Hardware version: 0
Node GUID: 0x08c0eb0300f4e6a6
System image GUID: 0x08c0eb0300f4e6a6
Port 1:
State: Active
Physical state: LinkUp
Rate: 25
Base lid: 0
LMC: 0
SM lid: 0
Capability mask: 0x00010000
Port GUID: 0x0ac0ebfffef4e6a6
Link layer: Ethernet
CA 'mlx5_1'
CA type: MT4119
Number of ports: 1
Firmware version: 16.31.1014
Hardware version: 0
Node GUID: 0x08c0eb0300f4e6a7
System image GUID: 0x08c0eb0300f4e6a6
Port 1:
State: Active
Physical state: LinkUp
Rate: 25
Base lid: 0
LMC: 0
SM lid: 0
Capability mask: 0x00010000
Port GUID: 0x0ac0ebfffef4e6a7
Link layer: Ethernet
y 其他
y.1ioctl下发的cmd buffer结构如何？机制如何？
y.1.1 先看这个cmd buffer在何时怎么用的？
用户态：
比如要读取一个counter，最终会调用ioctl
设置header后就下发：
y.1.2 再看这个cmd被初始化的地方：
初始化cmdbuf中的objid和method，objid是ioctl，method是counter read
y.1.3 除了前面的counter的obj，还有哪些其他的obj:
举例：
y.1.4 libibverbs下面的其他cmd的obj的代码存在形式
libibverbs下面的代码大多是以cmd_xxx.c的方式存在，这些文件实现机制类似前面的counter机制，定义接口，初始化cmdbuf，设置里面的objid和methodid。然后通过ioctl下发
比如qp的：一开始就定义cmdbuf
可以看到重要结构
ibv_command_buffer
struct ibv_command_buffer {
struct ibv_command_buffer *next;
struct ib_uverbs_attr *next_attr;
struct ib_uverbs_attr *last_attr;
/*
* Used by the legacy write interface to keep track of where the UHW
* buffer is located and the 'headroom' space that the common code
* uses to construct the command header and common command struct
* directly before the drivers' UHW.
*/
uint8_t uhw_in_idx;
uint8_t uhw_out_idx;
uint8_t uhw_in_headroom_dwords;
uint8_t uhw_out_headroom_dwords;
uint8_t buffer_error:1;
/*
* These flags control what execute_ioctl_fallback does if the kernel
* does not support ioctl
*/
uint8_t fallback_require_ex:1;
uint8_t fallback_ioctl_only:1;
struct ib_uverbs_ioctl_hdr hdr;
};
struct ib_uverbs_ioctl_hdr {
__u16 length;
__u16 object_id;
__u16 method_id;
__u16 num_attrs;
__aligned_u64 reserved1;
__u32 driver_id;
__u32 reserved2;
struct ib_uverbs_attr attrs[];
};
struct ib_uverbs_attr {
__u16 attr_id; /* command specific type attribute */
__u16 len; /* only for pointers and IDRs array */
__u16 flags; /* combination of UVERBS_ATTR_F_XXXX */
union {
struct {
__u8 elem_id;
__u8 reserved;
} enum_data;
__u16 reserved;
} attr_data;
union {
/*
* ptr to command, inline data, idr/fd or
* ptr to __u32 array of IDRs
*/
__aligned_u64 data;
/* Used by FD_IN and FD_OUT */
__s64 data_s64;
};
};
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