Writing RDMA applications on Linux
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- Raymond Evelyn Fields
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1 Writing RDMA applications on Linux Roland Dreier 1
2 RDMA? 2
3 RDMA: Remote DMA 3
4 RDMA: Remote Direct Memory Access 4
5 RDMA: Remote Direct Memory Access one sided operations 5
6 RDMA: Remote Direct Memory Access one sided operations get/put semantics 6
7 RDMA: Remote Direct Memory Access one sided operations get/put semantics direct data placement 7
8 RDMA: Remote Direct Memory Access...but wait, there's more... 8
9 RDMA: Remote Direct Memory Access Asynch work/completion queues 9
10 RDMA: Remote Direct Memory Access Asynch work/completion queues Kernel bypass 10
11 RDMA: InfiniBand 11
12 RDMA: InfiniBand iwarp 12
13 RDMA Verbs Subtitle 13
14 Verbs? 14
15 Verbs: not quite an API 15
16 Verbs: not quite an API; abstract definition of functionality 16
17 Verbs: resources (objects) operated on by verbs (functions) 17
18 Verbs: create object 18
19 Verbs: create object destroy object 19
20 Verbs: create object destroy object more interesting things... 20
21 Objects: 21
22 Objects: device context 22
23 Objects: queue pair (QP) 23
24 Objects: queue pair (QP) send queue & receive queue 24
25 Objects: queue pair (QP) post send post receive modify state 25
26 Objects: completion queue (CQ) 26
27 Objects: completion queue (CQ) work request completions reported as CQ entries 27
28 Objects: completion queue (CQ) poll CQ request notification 28
29 Objects: completion channel 29
30 Objects: memory region (MR) 30
31 Objects: protection domain (PD) 31
32 Objects: shared receive queue (SRQ) 32
33 Objects: shared receive queue (SRQ) multiple QPs can share a receive queue cleaning up is a little tricky 33
34 Objects: shared receive queue (SRQ) post receive 34
35 Objects: address handle (AH) memory window (MW) 35
36 Work processing: requests from WQs get executed completions are reported to CQs mostly things stay in order 36
37 Linux & RDMA 37
38 librdmacm 38
39 librdmacm Linux library to abstract connection setup 39
40 librdmacm Linux library to abstract connection setup same code runs on IB and iwarp 40
41 librdmacm mimics TCP socket model 41
42 librdmacm mimics TCP socket model cm_id is socket analog 42
43 librdmacm mimics TCP socket model cm_id is socket analog IP addressing used even on InfiniBand 43
44 librdmacm mimics TCP socket model cm_id is socket analog IP addressing used even on InfiniBand additional address/route resolution steps 44
45 librdmacm events reported through channels 45
46 librdmacm events reported through channels rdma_create_event_channel() rdma_get_cm_event() rdma_ack_cm_event() 46
47 librdmacm active connection steps 47
48 librdmacm active connection steps rdma_resolve_addr() rdma_resolve_route() rdma_connect() 48
49 librdmacm passive connection steps 49
50 librdmacm passive connection steps rdma_bind_addr() rdma_listen() rdma_accept() 50
51 libibverbs 51
52 libibverbs Linux implementation of RDMA verbs 52
53 libibverbs Loads device specific drivers for hardware support 53
54 libibverbs Loads device specific drivers for hardware support IB: libmthca, libmlx4, libipathverbs, libehca iwarp: libcxgb3, libamso 54
55 libibverbs Loads device specific drivers for hardware support IB: libmthca, libmlx4, libipathverbs, libehca iwarp: libcxgb3, libamso 55
56 libibverbs Creating QP can be confusing rdma_create_qp() vs. ibv_create_qp() all those parameters! 56
57 libibverbs Posting work requests is tricky too send opcodes iwarp doesn't have immed data or atomics signaled and unsignaled completions 57
58 Q and A 58
59 59
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