88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
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/*
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* Copyright(c) 2018 Intel Corporation.
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*
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*/
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#ifndef _HFI1_OPFN_H
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#define _HFI1_OPFN_H
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/**
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* DOC: Omni Path Feature Negotion (OPFN)
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*
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* OPFN is a discovery protocol for Intel Omni-Path fabric that
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* allows two RC QPs to negotiate a common feature that both QPs
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* can support. Currently, the only OPA feature that OPFN
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* supports is TID RDMA.
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*
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* Architecture
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*
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* OPFN involves the communication between two QPs on the HFI
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* level on an Omni-Path fabric, and ULPs have no knowledge of
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* OPFN at all.
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*
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* Implementation
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*
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* OPFN extends the existing IB RC protocol with the following
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* changes:
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* -- Uses Bit 24 (reserved) of DWORD 1 of Base Transport
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* Header (BTH1) to indicate that the RC QP supports OPFN;
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* -- Uses a combination of RC COMPARE_SWAP opcode (0x13) and
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* the address U64_MAX (0xFFFFFFFFFFFFFFFF) as an OPFN
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* request; The 64-bit data carried with the request/response
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* contains the parameters for negotiation and will be
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* defined in tid_rdma.c file;
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* -- Defines IB_WR_RESERVED3 as IB_WR_OPFN.
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*
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* The OPFN communication will be triggered when an RC QP
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* receives a request with Bit 24 of BTH1 set. The responder QP
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* will then post send an OPFN request with its local
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* parameters, which will be sent to the requester QP once all
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* existing requests on the responder QP side have been sent.
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* Once the requester QP receives the OPFN request, it will
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* keep a copy of the responder QP's parameters, and return a
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* response packet with its own local parameters. The responder
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* QP receives the response packet and keeps a copy of the requester
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* QP's parameters. After this exchange, each side has the parameters
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* for both sides and therefore can select the right parameters
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* for future transactions
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*/
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#include <linux/workqueue.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdmavt_qp.h>
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/* STL Verbs Extended */
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#define IB_BTHE_E_SHIFT 24
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#define HFI1_VERBS_E_ATOMIC_VADDR U64_MAX
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enum hfi1_opfn_codes {
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STL_VERBS_EXTD_NONE = 0,
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STL_VERBS_EXTD_TID_RDMA,
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STL_VERBS_EXTD_MAX
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};
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struct hfi1_opfn_data {
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u8 extended;
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u16 requested;
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u16 completed;
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enum hfi1_opfn_codes curr;
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/* serialize opfn function calls */
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spinlock_t lock;
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struct work_struct opfn_work;
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};
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/* WR opcode for OPFN */
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#define IB_WR_OPFN IB_WR_RESERVED3
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void opfn_send_conn_request(struct work_struct *work);
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void opfn_conn_response(struct rvt_qp *qp, struct rvt_ack_entry *e,
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struct ib_atomic_eth *ateth);
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void opfn_conn_reply(struct rvt_qp *qp, u64 data);
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void opfn_conn_error(struct rvt_qp *qp);
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void opfn_qp_init(struct rvt_qp *qp, struct ib_qp_attr *attr, int attr_mask);
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void opfn_trigger_conn_request(struct rvt_qp *qp, u32 bth1);
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int opfn_init(void);
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void opfn_exit(void);
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#endif /* _HFI1_OPFN_H */
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