Messages in this thread | | | Date | Wed, 3 Jan 2007 17:00:13 +0200 | From | "Michael S. Tsirkin" <> | Subject | Re: [PATCH v4 01/13] Linux RDMA Core Changes |
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> > > > 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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