> >
> > 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.
--
MST
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