IBV_WR_ATOMIC_FETCH_AND_ADD和IBV_WR_ATOMIC_CMP_AND_SWP使用总结

一：IBV_WR_ATOMIC_FETCH_AND_ADD

int post_send_faa(struct RemoteMR remote_mr, int size)
{struct ibv_sge list = {.addr   = (uint64_t)ib_res.buf,.length = size,//要大于等于8.lkey   = ib_res.mr->lkey};struct ibv_send_wr *bad_wr, wr = {.wr_id      = WRITE_WRID,.sg_list    = &list,.num_sge    = 1,.opcode     = IBV_WR_ATOMIC_FETCH_AND_ADD,.opcode     = IBV_WR_ATOMIC_CMP_AND_SWP,.send_flags = IBV_SEND_SIGNALED,.wr.atomic.remote_addr = remote_mr.remote_addr,.wr.atomic.rkey = remote_mr.rkey,.wr.atomic.compare_add = 7UL,.next       = NULL};return ibv_post_send(ib_res.qp, &wr, &bad_wr);
}

二：IBV_WR_ATOMIC_CMP_AND_SWP(CAS)
注：这里的remote端是下发cas的一段。

int post_send_cas(struct RemoteMR remote_mr, int size)
{struct ibv_sge list = {.addr   = (uint64_t)ib_res.buf,.length = size,//要大于等于8.lkey   = ib_res.mr->lkey};struct ibv_send_wr *bad_wr, wr = {.wr_id      = WRITE_WRID,.sg_list    = &list,.num_sge    = 1,.opcode     = IBV_WR_ATOMIC_CMP_AND_SWP,.send_flags = IBV_SEND_SIGNALED,.wr.atomic.remote_addr = remote_mr.remote_addr,.wr.atomic.rkey = remote_mr.rkey,.wr.atomic.swap = 10UL,.wr.atomic.compare_add = 7UL,.next       = NULL};return ibv_post_send(ib_res.qp, &wr, &bad_wr);
}

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