/*-
 *   BSD LICENSE
 *
 *   Copyright (c) Intel Corporation.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "spdk/stdinc.h"

#include "nvmf_internal.h"
#include "transport.h"

#include "spdk/io_channel.h"
#include "spdk/nvme.h"
#include "spdk/nvmf_spec.h"
#include "spdk/trace.h"

#include "spdk_internal/assert.h"
#include "spdk_internal/log.h"

static void
spdk_nvmf_request_complete_on_qpair(void *ctx)
{
	struct spdk_nvmf_request *req = ctx;
	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;

	rsp->sqid = 0;
	rsp->status.p = 0;
	rsp->cid = req->cmd->nvme_cmd.cid;

	SPDK_DEBUGLOG(SPDK_LOG_NVMF,
		      "cpl: cid=%u cdw0=0x%08x rsvd1=%u status=0x%04x\n",
		      rsp->cid, rsp->cdw0, rsp->rsvd1,
		      *(uint16_t *)&rsp->status);

	if (spdk_nvmf_transport_req_complete(req)) {
		SPDK_ERRLOG("Transport request completion error!\n");
	}
}

int
spdk_nvmf_request_complete(struct spdk_nvmf_request *req)
{
	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;

	if (cmd->opc == SPDK_NVME_OPC_FABRIC ||
	    req->qpair->type == QPAIR_TYPE_AQ) {
		struct spdk_io_channel *ch;

		ch = spdk_io_channel_from_ctx(req->qpair->group);
		/* Pass a message back to the originating thread. */
		spdk_thread_send_msg(spdk_io_channel_get_thread(ch),
				     spdk_nvmf_request_complete_on_qpair,
				     req);
	} else {
		spdk_nvmf_request_complete_on_qpair(req);
	}

	return 0;
}

static void
nvmf_trace_command(union nvmf_h2c_msg *h2c_msg, enum spdk_nvmf_qpair_type qpair_type)
{
	struct spdk_nvmf_capsule_cmd *cap_hdr = &h2c_msg->nvmf_cmd;
	struct spdk_nvme_cmd *cmd = &h2c_msg->nvme_cmd;
	struct spdk_nvme_sgl_descriptor *sgl = &cmd->dptr.sgl1;
	uint8_t opc;

	if (cmd->opc == SPDK_NVME_OPC_FABRIC) {
		opc = cap_hdr->fctype;
		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "%s Fabrics cmd: fctype 0x%02x cid %u\n",
			      qpair_type == QPAIR_TYPE_AQ ? "Admin" : "I/O",
			      cap_hdr->fctype, cap_hdr->cid);
	} else {
		opc = cmd->opc;
		SPDK_DEBUGLOG(SPDK_LOG_NVMF, "%s cmd: opc 0x%02x fuse %u cid %u nsid %u cdw10 0x%08x\n",
			      qpair_type == QPAIR_TYPE_AQ ? "Admin" : "I/O",
			      cmd->opc, cmd->fuse, cmd->cid, cmd->nsid, cmd->cdw10);
		if (cmd->mptr) {
			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "mptr 0x%" PRIx64 "\n", cmd->mptr);
		}
		if (cmd->psdt != SPDK_NVME_PSDT_SGL_MPTR_CONTIG &&
		    cmd->psdt != SPDK_NVME_PSDT_SGL_MPTR_SGL) {
			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "psdt %u\n", cmd->psdt);
		}
	}

	if (spdk_nvme_opc_get_data_transfer(opc) != SPDK_NVME_DATA_NONE) {
		if (sgl->generic.type == SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK) {
			SPDK_DEBUGLOG(SPDK_LOG_NVMF,
				      "SGL: Keyed%s: addr 0x%" PRIx64 " key 0x%x len 0x%x\n",
				      sgl->generic.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY ? " (Inv)" : "",
				      sgl->address, sgl->keyed.key, sgl->keyed.length);
		} else if (sgl->generic.type == SPDK_NVME_SGL_TYPE_DATA_BLOCK) {
			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "SGL: Data block: %s 0x%" PRIx64 " len 0x%x\n",
				      sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET ? "offs" : "addr",
				      sgl->address, sgl->unkeyed.length);
		} else {
			SPDK_DEBUGLOG(SPDK_LOG_NVMF, "SGL type 0x%x subtype 0x%x\n",
				      sgl->generic.type, sgl->generic.subtype);
		}
	}
}

static void
spdk_nvmf_request_exec_on_master(void *ctx)
{
	struct spdk_nvmf_request *req = ctx;
	struct spdk_nvmf_ctrlr *ctrlr = req->qpair->ctrlr;
	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
	spdk_nvmf_request_exec_status status;

	if (cmd->opc == SPDK_NVME_OPC_FABRIC) {
		status = spdk_nvmf_ctrlr_process_fabrics_cmd(req);
	} else if (ctrlr == NULL || !ctrlr->vcprop.cc.bits.en) {
		/* Only Fabric commands are allowed when the controller is disabled */
		SPDK_ERRLOG("Non-Fabric command sent to disabled controller\n");
		rsp->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
		status = SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE;
	} else {
		status = spdk_nvmf_ctrlr_process_admin_cmd(req);
	}

	if (status == SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE) {
		spdk_nvmf_request_complete(req);
	}
}

void
spdk_nvmf_request_exec(struct spdk_nvmf_request *req)
{
	struct spdk_nvmf_qpair *qpair = req->qpair;
	struct spdk_nvmf_ctrlr *ctrlr = qpair->ctrlr;
	struct spdk_nvme_cmd *cmd = &req->cmd->nvme_cmd;
	struct spdk_nvme_cpl *rsp = &req->rsp->nvme_cpl;
	spdk_nvmf_request_exec_status status;

	nvmf_trace_command(req->cmd, qpair->type);

	if (spdk_unlikely(cmd->opc == SPDK_NVME_OPC_FABRIC || qpair->type == QPAIR_TYPE_AQ)) {
		/* Fabric and admin commands are sent to the master core for synchronization. */
		spdk_thread_send_msg(qpair->transport->tgt->master_thread,
				     spdk_nvmf_request_exec_on_master,
				     req);
		return;
	}

	if (spdk_unlikely(ctrlr == NULL)) {
		SPDK_ERRLOG("I/O command sent before connect\n");
		rsp->status.sc = SPDK_NVME_SC_COMMAND_SEQUENCE_ERROR;
		spdk_nvmf_request_complete_on_qpair(req);
		return;
	}

	status = spdk_nvmf_ctrlr_process_io_cmd(req);
	if (status == SPDK_NVMF_REQUEST_EXEC_STATUS_COMPLETE) {
		spdk_nvmf_request_complete_on_qpair(req);
	}
}

int
spdk_nvmf_request_abort(struct spdk_nvmf_request *req)
{
	/* TODO: implement abort, at least for commands that are still queued in software */
	return -1;
}