On Wed, 2006-08-23 at 12:28 -0500, Tang, Changqing wrote:
> >
> >Actually, A knows the data is in B's memory when A gets the
> >completion notice. B can't rely on anything unless A uses the
> >RDMA write with immediate which puts a completion event in B's CQ.
>
> Ralph:
>
> Can you give a few more words on 'immediate', I know A will have
> A completion event in its CQ, Does B receive a CQ event on the
> Same RDMA operation as well ?
>
> --CQ Tang
B doesn't get a completion event for a RDMA write initiated from A
unless A does something like the following:
struct ib_send_wr wr;
wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM;
wr.imm_data = cpu_to_be32(value);
...
ib_post_send(qp, &wr, NULL);
B will get a completion event with the IB_WC_WITH_IMM
flag set in struct ib_wc.wc_flags and ib_wc.imm_data set
to the value that A sent.
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