IB atomic operations

[Bharath Ramesh]

Hi,
        I am trying to use IB atomic operations, specifically fetch and add.
I tried a small example but I am unable to get it to work. The WC status is
IBV_WC_REM_INV_REQ_ERR. My sample code is as follows:

sge.addr = (uintptr_t) &data;
sge.length = sizeof (uint64_t);
sge.lkey = ib_mr->lkey;
wr.opcode = IBV_WR_ATOMIC_FETCH_AND_ADD;
wr.send_flags = IBV_SEND_SIGNALED;
wr.next = NULL;
wr.num_sge = 1;
wr.sg_list = &sge;
wr.wr.atomic.remote_addr = vaddr;
wr.wr.atomic.compare_add = 1;
//wr.wr.atomic.swap = 0;
wr.wr.atomic.rkey = rkey;
wr.wr_id = 1;
ret = ibv_post_send (ib_qp, &wr, &wr_bad);
do {
        c = ibv_poll_cq (ib_cq, 1, &wc);
} while (c == 0);

if (c < 0) {
        printf ("ERROR: ibv_poll_cq failed.\n");
      return -1;
}

if (wc.status != IBV_WC_SUCCESS) {
        // print wc info.
        // print qp status.
}

Any help on this appreciated.

Regards,

Bharath

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