diff options
Diffstat (limited to 'drivers/nvme/target/fabrics-cmd.c')
| -rw-r--r-- | drivers/nvme/target/fabrics-cmd.c | 373 |
1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/nvme/target/fabrics-cmd.c b/drivers/nvme/target/fabrics-cmd.c new file mode 100644 index 0000000000..d8da840a1c --- /dev/null +++ b/drivers/nvme/target/fabrics-cmd.c @@ -0,0 +1,373 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * NVMe Fabrics command implementation. + * Copyright (c) 2015-2016 HGST, a Western Digital Company. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/blkdev.h> +#include "nvmet.h" + +static void nvmet_execute_prop_set(struct nvmet_req *req) +{ + u64 val = le64_to_cpu(req->cmd->prop_set.value); + u16 status = 0; + + if (!nvmet_check_transfer_len(req, 0)) + return; + + if (req->cmd->prop_set.attrib & 1) { + req->error_loc = + offsetof(struct nvmf_property_set_command, attrib); + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + goto out; + } + + switch (le32_to_cpu(req->cmd->prop_set.offset)) { + case NVME_REG_CC: + nvmet_update_cc(req->sq->ctrl, val); + break; + default: + req->error_loc = + offsetof(struct nvmf_property_set_command, offset); + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + } +out: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_prop_get(struct nvmet_req *req) +{ + struct nvmet_ctrl *ctrl = req->sq->ctrl; + u16 status = 0; + u64 val = 0; + + if (!nvmet_check_transfer_len(req, 0)) + return; + + if (req->cmd->prop_get.attrib & 1) { + switch (le32_to_cpu(req->cmd->prop_get.offset)) { + case NVME_REG_CAP: + val = ctrl->cap; + break; + default: + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + } else { + switch (le32_to_cpu(req->cmd->prop_get.offset)) { + case NVME_REG_VS: + val = ctrl->subsys->ver; + break; + case NVME_REG_CC: + val = ctrl->cc; + break; + case NVME_REG_CSTS: + val = ctrl->csts; + break; + default: + status = NVME_SC_INVALID_FIELD | NVME_SC_DNR; + break; + } + } + + if (status && req->cmd->prop_get.attrib & 1) { + req->error_loc = + offsetof(struct nvmf_property_get_command, offset); + } else { + req->error_loc = + offsetof(struct nvmf_property_get_command, attrib); + } + + req->cqe->result.u64 = cpu_to_le64(val); + nvmet_req_complete(req, status); +} + +u16 nvmet_parse_fabrics_admin_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + switch (cmd->fabrics.fctype) { + case nvme_fabrics_type_property_set: + req->execute = nvmet_execute_prop_set; + break; + case nvme_fabrics_type_property_get: + req->execute = nvmet_execute_prop_get; + break; +#ifdef CONFIG_NVME_TARGET_AUTH + case nvme_fabrics_type_auth_send: + req->execute = nvmet_execute_auth_send; + break; + case nvme_fabrics_type_auth_receive: + req->execute = nvmet_execute_auth_receive; + break; +#endif + default: + pr_debug("received unknown capsule type 0x%x\n", + cmd->fabrics.fctype); + req->error_loc = offsetof(struct nvmf_common_command, fctype); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + + return 0; +} + +u16 nvmet_parse_fabrics_io_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + switch (cmd->fabrics.fctype) { +#ifdef CONFIG_NVME_TARGET_AUTH + case nvme_fabrics_type_auth_send: + req->execute = nvmet_execute_auth_send; + break; + case nvme_fabrics_type_auth_receive: + req->execute = nvmet_execute_auth_receive; + break; +#endif + default: + pr_debug("received unknown capsule type 0x%x\n", + cmd->fabrics.fctype); + req->error_loc = offsetof(struct nvmf_common_command, fctype); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + + return 0; +} + +static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req) +{ + struct nvmf_connect_command *c = &req->cmd->connect; + u16 qid = le16_to_cpu(c->qid); + u16 sqsize = le16_to_cpu(c->sqsize); + struct nvmet_ctrl *old; + u16 mqes = NVME_CAP_MQES(ctrl->cap); + u16 ret; + + if (!sqsize) { + pr_warn("queue size zero!\n"); + req->error_loc = offsetof(struct nvmf_connect_command, sqsize); + req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize); + ret = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + goto err; + } + + if (ctrl->sqs[qid] != NULL) { + pr_warn("qid %u has already been created\n", qid); + req->error_loc = offsetof(struct nvmf_connect_command, qid); + return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR; + } + + if (sqsize > mqes) { + pr_warn("sqsize %u is larger than MQES supported %u cntlid %d\n", + sqsize, mqes, ctrl->cntlid); + req->error_loc = offsetof(struct nvmf_connect_command, sqsize); + req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(sqsize); + return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + } + + old = cmpxchg(&req->sq->ctrl, NULL, ctrl); + if (old) { + pr_warn("queue already connected!\n"); + req->error_loc = offsetof(struct nvmf_connect_command, opcode); + return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR; + } + + /* note: convert queue size from 0's-based value to 1's-based value */ + nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1); + nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1); + + if (c->cattr & NVME_CONNECT_DISABLE_SQFLOW) { + req->sq->sqhd_disabled = true; + req->cqe->sq_head = cpu_to_le16(0xffff); + } + + if (ctrl->ops->install_queue) { + ret = ctrl->ops->install_queue(req->sq); + if (ret) { + pr_err("failed to install queue %d cntlid %d ret %x\n", + qid, ctrl->cntlid, ret); + ctrl->sqs[qid] = NULL; + goto err; + } + } + + return 0; + +err: + req->sq->ctrl = NULL; + return ret; +} + +static u32 nvmet_connect_result(struct nvmet_ctrl *ctrl) +{ + return (u32)ctrl->cntlid | + (nvmet_has_auth(ctrl) ? NVME_CONNECT_AUTHREQ_ATR : 0); +} + +static void nvmet_execute_admin_connect(struct nvmet_req *req) +{ + struct nvmf_connect_command *c = &req->cmd->connect; + struct nvmf_connect_data *d; + struct nvmet_ctrl *ctrl = NULL; + u16 status = 0; + int ret; + + if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data))) + return; + + d = kmalloc(sizeof(*d), GFP_KERNEL); + if (!d) { + status = NVME_SC_INTERNAL; + goto complete; + } + + status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); + if (status) + goto out; + + /* zero out initial completion result, assign values as needed */ + req->cqe->result.u32 = 0; + + if (c->recfmt != 0) { + pr_warn("invalid connect version (%d).\n", + le16_to_cpu(c->recfmt)); + req->error_loc = offsetof(struct nvmf_connect_command, recfmt); + status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; + goto out; + } + + if (unlikely(d->cntlid != cpu_to_le16(0xffff))) { + pr_warn("connect attempt for invalid controller ID %#x\n", + d->cntlid); + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + req->cqe->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid); + goto out; + } + + d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0'; + d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0'; + status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req, + le32_to_cpu(c->kato), &ctrl); + if (status) + goto out; + + ctrl->pi_support = ctrl->port->pi_enable && ctrl->subsys->pi_support; + + uuid_copy(&ctrl->hostid, &d->hostid); + + ret = nvmet_setup_auth(ctrl); + if (ret < 0) { + pr_err("Failed to setup authentication, error %d\n", ret); + nvmet_ctrl_put(ctrl); + if (ret == -EPERM) + status = (NVME_SC_CONNECT_INVALID_HOST | NVME_SC_DNR); + else + status = NVME_SC_INTERNAL; + goto out; + } + + status = nvmet_install_queue(ctrl, req); + if (status) { + nvmet_ctrl_put(ctrl); + goto out; + } + + pr_info("creating %s controller %d for subsystem %s for NQN %s%s%s.\n", + nvmet_is_disc_subsys(ctrl->subsys) ? "discovery" : "nvm", + ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn, + ctrl->pi_support ? " T10-PI is enabled" : "", + nvmet_has_auth(ctrl) ? " with DH-HMAC-CHAP" : ""); + req->cqe->result.u32 = cpu_to_le32(nvmet_connect_result(ctrl)); +out: + kfree(d); +complete: + nvmet_req_complete(req, status); +} + +static void nvmet_execute_io_connect(struct nvmet_req *req) +{ + struct nvmf_connect_command *c = &req->cmd->connect; + struct nvmf_connect_data *d; + struct nvmet_ctrl *ctrl; + u16 qid = le16_to_cpu(c->qid); + u16 status = 0; + + if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data))) + return; + + d = kmalloc(sizeof(*d), GFP_KERNEL); + if (!d) { + status = NVME_SC_INTERNAL; + goto complete; + } + + status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d)); + if (status) + goto out; + + /* zero out initial completion result, assign values as needed */ + req->cqe->result.u32 = 0; + + if (c->recfmt != 0) { + pr_warn("invalid connect version (%d).\n", + le16_to_cpu(c->recfmt)); + status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR; + goto out; + } + + d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0'; + d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0'; + ctrl = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn, + le16_to_cpu(d->cntlid), req); + if (!ctrl) { + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + goto out; + } + + if (unlikely(qid > ctrl->subsys->max_qid)) { + pr_warn("invalid queue id (%d)\n", qid); + status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR; + req->cqe->result.u32 = IPO_IATTR_CONNECT_SQE(qid); + goto out_ctrl_put; + } + + status = nvmet_install_queue(ctrl, req); + if (status) + goto out_ctrl_put; + + pr_debug("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid); + req->cqe->result.u32 = cpu_to_le32(nvmet_connect_result(ctrl)); +out: + kfree(d); +complete: + nvmet_req_complete(req, status); + return; + +out_ctrl_put: + nvmet_ctrl_put(ctrl); + goto out; +} + +u16 nvmet_parse_connect_cmd(struct nvmet_req *req) +{ + struct nvme_command *cmd = req->cmd; + + if (!nvme_is_fabrics(cmd)) { + pr_debug("invalid command 0x%x on unconnected queue.\n", + cmd->fabrics.opcode); + req->error_loc = offsetof(struct nvme_common_command, opcode); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + if (cmd->fabrics.fctype != nvme_fabrics_type_connect) { + pr_debug("invalid capsule type 0x%x on unconnected queue.\n", + cmd->fabrics.fctype); + req->error_loc = offsetof(struct nvmf_common_command, fctype); + return NVME_SC_INVALID_OPCODE | NVME_SC_DNR; + } + + if (cmd->connect.qid == 0) + req->execute = nvmet_execute_admin_connect; + else + req->execute = nvmet_execute_io_connect; + return 0; +} |