[ofa-general] Shared Protection Domain for iWARP

[Sean Hefty]

>QP1:
>----
>1.        rdma_create_event_channel()
>2.        rdma_create_id(event_channel, cm_id_1, ...)
>3.        rdma_resolve_addr(cm_id_1, ...)
>4.        rdma_resolve_route(cm_id_1, ...)
>5. pd_1 = ibv_alloc_pd(cm_id_1->verbs)
>6.        ibv_create_comp_channel(cm_id_1->verbs)
>7.        ibv_create_cq(cm_id_1->verbs, ..., comp_channel, ...)
>8.        rdma_create_qp(cm_id_1, pd_1, init_attrs)

Do you plan on connecting the QPs together?  If so, you'll need rdma_connect()
here.

>QP2: (Variant A)
>----
>2.        rdma_create_id(event_channel, cm_id_2, ...)
>3.        rdma_resolve_addr(cm_id_2, ...)
>4.        rdma_resolve_route(cm_id_2, ...)
>
>6.        ibv_create_comp_channel(cm_id_2->verbs)
>7.        ibv_create_cq(cm_id_2->verbs, ..., comp_channel, ...)
>8.        rdma_create_qp(cm_id_2, pd_1, init_attrs)
>
>----
>QP2: (Variant B)
>----
>6.        ibv_create_comp_channel(cm_id_1->verbs)
>7.        ibv_create_cq(cm_id_1->verbs, ..., comp_channel, ...)
>8.        rdma_create_qp(cm_id_1, pd_1, init_attrs)

I don't know if iWarp supports peer to peer connections.  If not, then you'll
need to change one of the sides to act as the passive (server) side for the
connection.  See the rdma_cm.7 man page for a flow outline.

- Sean