327 lines
8.1 KiB
C
327 lines
8.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* NVMe Fabrics command implementation.
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* Copyright (c) 2015-2016 HGST, a Western Digital Company.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/blkdev.h>
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#include "nvmet.h"
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static void nvmet_execute_prop_set(struct nvmet_req *req)
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{
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u64 val = le64_to_cpu(req->cmd->prop_set.value);
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u16 status = 0;
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if (!nvmet_check_transfer_len(req, 0))
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return;
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if (req->cmd->prop_set.attrib & 1) {
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req->error_loc =
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offsetof(struct nvmf_property_set_command, attrib);
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status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
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goto out;
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}
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switch (le32_to_cpu(req->cmd->prop_set.offset)) {
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case NVME_REG_CC:
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nvmet_update_cc(req->sq->ctrl, val);
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break;
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default:
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req->error_loc =
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offsetof(struct nvmf_property_set_command, offset);
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status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
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}
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out:
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_prop_get(struct nvmet_req *req)
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{
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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u16 status = 0;
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u64 val = 0;
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if (!nvmet_check_transfer_len(req, 0))
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return;
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if (req->cmd->prop_get.attrib & 1) {
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switch (le32_to_cpu(req->cmd->prop_get.offset)) {
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case NVME_REG_CAP:
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val = ctrl->cap;
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break;
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default:
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status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
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break;
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}
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} else {
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switch (le32_to_cpu(req->cmd->prop_get.offset)) {
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case NVME_REG_VS:
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val = ctrl->subsys->ver;
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break;
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case NVME_REG_CC:
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val = ctrl->cc;
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break;
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case NVME_REG_CSTS:
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val = ctrl->csts;
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break;
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default:
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status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
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break;
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}
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}
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if (status && req->cmd->prop_get.attrib & 1) {
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req->error_loc =
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offsetof(struct nvmf_property_get_command, offset);
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} else {
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req->error_loc =
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offsetof(struct nvmf_property_get_command, attrib);
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}
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req->cqe->result.u64 = cpu_to_le64(val);
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nvmet_req_complete(req, status);
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}
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u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req)
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{
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struct nvme_command *cmd = req->cmd;
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switch (cmd->fabrics.fctype) {
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case nvme_fabrics_type_property_set:
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req->execute = nvmet_execute_prop_set;
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break;
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case nvme_fabrics_type_property_get:
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req->execute = nvmet_execute_prop_get;
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break;
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default:
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pr_debug("received unknown capsule type 0x%x\n",
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cmd->fabrics.fctype);
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req->error_loc = offsetof(struct nvmf_common_command, fctype);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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return 0;
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}
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static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
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{
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struct nvmf_connect_command *c = &req->cmd->connect;
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u16 qid = le16_to_cpu(c->qid);
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u16 sqsize = le16_to_cpu(c->sqsize);
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struct nvmet_ctrl *old;
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u16 mqes = NVME_CAP_MQES(ctrl->cap);
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u16 ret;
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if (!sqsize) {
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pr_warn("queue size zero!\n");
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req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
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req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
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ret = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
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goto err;
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}
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if (ctrl->sqs[qid] != NULL) {
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pr_warn("qid %u has already been created\n", qid);
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req->error_loc = offsetof(struct nvmf_connect_command, qid);
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return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
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}
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if (sqsize > mqes) {
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pr_warn("sqsize %u is larger than MQES supported %u cntlid %d\n",
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sqsize, mqes, ctrl->cntlid);
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req->error_loc = offsetof(struct nvmf_connect_command, sqsize);
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req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize);
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return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
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}
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old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
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if (old) {
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pr_warn("queue already connected!\n");
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req->error_loc = offsetof(struct nvmf_connect_command, opcode);
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return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
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}
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/* note: convert queue size from 0's-based value to 1's-based value */
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nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1);
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nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1);
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if (c->cattr & NVME_CONNECT_DISABLE_SQFLOW) {
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req->sq->sqhd_disabled = true;
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req->cqe->sq_head = cpu_to_le16(0xffff);
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}
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if (ctrl->ops->install_queue) {
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ret = ctrl->ops->install_queue(req->sq);
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if (ret) {
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pr_err("failed to install queue %d cntlid %d ret %x\n",
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qid, ctrl->cntlid, ret);
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ctrl->sqs[qid] = NULL;
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goto err;
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}
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}
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return 0;
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err:
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req->sq->ctrl = NULL;
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return ret;
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}
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static void nvmet_execute_admin_connect(struct nvmet_req *req)
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{
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struct nvmf_connect_command *c = &req->cmd->connect;
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struct nvmf_connect_data *d;
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struct nvmet_ctrl *ctrl = NULL;
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u16 status = 0;
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if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
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return;
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d = kmalloc(sizeof(*d), GFP_KERNEL);
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if (!d) {
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status = NVME_SC_INTERNAL;
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goto complete;
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}
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status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
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if (status)
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goto out;
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/* zero out initial completion result, assign values as needed */
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req->cqe->result.u32 = 0;
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if (c->recfmt != 0) {
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pr_warn("invalid connect version (%d).\n",
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le16_to_cpu(c->recfmt));
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req->error_loc = offsetof(struct nvmf_connect_command, recfmt);
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status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
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goto out;
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}
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if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
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pr_warn("connect attempt for invalid controller ID %#x\n",
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d->cntlid);
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status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
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req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
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goto out;
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}
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d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
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d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
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status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req,
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le32_to_cpu(c->kato), &ctrl);
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if (status)
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goto out;
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ctrl->pi_support = ctrl->port->pi_enable && ctrl->subsys->pi_support;
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uuid_copy(&ctrl->hostid, &d->hostid);
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status = nvmet_install_queue(ctrl, req);
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if (status) {
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nvmet_ctrl_put(ctrl);
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goto out;
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}
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pr_info("creating controller %d for subsystem %s for NQN %s%s.\n",
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ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn,
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ctrl->pi_support ? " T10-PI is enabled" : "");
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req->cqe->result.u16 = cpu_to_le16(ctrl->cntlid);
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out:
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kfree(d);
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complete:
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_io_connect(struct nvmet_req *req)
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{
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struct nvmf_connect_command *c = &req->cmd->connect;
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struct nvmf_connect_data *d;
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struct nvmet_ctrl *ctrl;
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u16 qid = le16_to_cpu(c->qid);
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u16 status = 0;
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if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
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return;
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d = kmalloc(sizeof(*d), GFP_KERNEL);
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if (!d) {
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status = NVME_SC_INTERNAL;
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goto complete;
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}
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status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
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if (status)
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goto out;
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/* zero out initial completion result, assign values as needed */
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req->cqe->result.u32 = 0;
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if (c->recfmt != 0) {
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pr_warn("invalid connect version (%d).\n",
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le16_to_cpu(c->recfmt));
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status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
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goto out;
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}
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d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
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d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
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ctrl = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
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le16_to_cpu(d->cntlid), req);
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if (!ctrl) {
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status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
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goto out;
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}
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if (unlikely(qid > ctrl->subsys->max_qid)) {
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pr_warn("invalid queue id (%d)\n", qid);
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status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
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req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(qid);
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goto out_ctrl_put;
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}
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status = nvmet_install_queue(ctrl, req);
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if (status)
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goto out_ctrl_put;
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/* pass back cntlid for successful completion */
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req->cqe->result.u16 = cpu_to_le16(ctrl->cntlid);
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pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
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out:
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kfree(d);
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complete:
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nvmet_req_complete(req, status);
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return;
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out_ctrl_put:
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nvmet_ctrl_put(ctrl);
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goto out;
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}
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u16 nvmet_parse_connect_cmd(struct nvmet_req *req)
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{
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struct nvme_command *cmd = req->cmd;
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if (!nvme_is_fabrics(cmd)) {
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pr_debug("invalid command 0x%x on unconnected queue.\n",
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cmd->fabrics.opcode);
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req->error_loc = offsetof(struct nvme_common_command, opcode);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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if (cmd->fabrics.fctype != nvme_fabrics_type_connect) {
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pr_debug("invalid capsule type 0x%x on unconnected queue.\n",
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cmd->fabrics.fctype);
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req->error_loc = offsetof(struct nvmf_common_command, fctype);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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if (cmd->connect.qid == 0)
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req->execute = nvmet_execute_admin_connect;
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else
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req->execute = nvmet_execute_io_connect;
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return 0;
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}
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