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    SubjectRe: [PATCH v4 01/13] Linux RDMA Core Changes
    > > 
    > > No, it won't need 2 transitions - just an extra function call,
    > > so it won't hurt performance - it would improve performance.
    > >
    > > ib_uverbs_req_notify_cq would call
    > >
    > > ib_uverbs_req_notify_cq()
    > > {
    > > ib_set_cq_udata(cq, udata)
    > > ib_req_notify_cq(cq, cmd.solicited_only ?
    > > IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
    > > }
    > >
    >
    > ib_set_cq_udata() would transition into the kernel to pass in the
    > consumer's index. In addition, ib_req_notify_cq would also transition
    > into the kernel since its not a bypass function for chelsio.

    We misunderstand each other.

    ib_uverbs_req_notify_cq is in drivers/infiniband/core/uverbs_cmd.c -
    all this code runs inside the IB_USER_VERBS_CMD_REQ_NOTIFY_CQ command,
    so there is a single user to kernel transition.

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