1 files changed, 430 insertions, 0 deletions

diff --git a/drivers/nvme/target/fabrics-cmd.c b/drivers/nvme/target/fabrics-cmd.c
new file mode 100644
index 000000000..42d1d1811
--- /dev/null
+++ b/drivers/nvme/target/fabrics-cmd.c
@@ -0,0 +1,430 @@
+// 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_STATUS_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_STATUS_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_STATUS_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;
+		case NVME_REG_CRTO:
+			val = NVME_CAP_TIMEOUT(ctrl->csts);
+			break;
+		default:
+			status = NVME_SC_INVALID_FIELD | NVME_STATUS_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);
+}
+
+u32 nvmet_fabrics_admin_cmd_data_len(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:
+		return nvmet_auth_send_data_len(req);
+	case nvme_fabrics_type_auth_receive:
+		return nvmet_auth_receive_data_len(req);
+#endif
+	default:
+		return 0;
+	}
+}
+
+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_STATUS_DNR;
+	}
+
+	return 0;
+}
+
+u32 nvmet_fabrics_io_cmd_data_len(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:
+		return nvmet_auth_send_data_len(req);
+	case nvme_fabrics_type_auth_receive:
+		return nvmet_auth_receive_data_len(req);
+#endif
+	default:
+		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_STATUS_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_STATUS_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_STATUS_DNR;
+	}
+
+	/* for fabrics, this value applies to only the I/O Submission Queues */
+	if (qid && 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_STATUS_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_STATUS_DNR;
+	}
+
+	kref_get(&ctrl->ref);
+	old = cmpxchg(&req->cq->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_STATUS_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, struct nvmet_sq *sq)
+{
+	bool needs_auth = nvmet_has_auth(ctrl, sq);
+	key_serial_t keyid = nvmet_queue_tls_keyid(sq);
+
+	/* Do not authenticate I/O queues */
+	if (sq->qid)
+		needs_auth = false;
+
+	if (keyid)
+		pr_debug("%s: ctrl %d qid %d should %sauthenticate, tls psk %08x\n",
+			 __func__, ctrl->cntlid, sq->qid,
+			 needs_auth ? "" : "not ", keyid);
+	else
+		pr_debug("%s: ctrl %d qid %d should %sauthenticate%s\n",
+			 __func__, ctrl->cntlid, sq->qid,
+			 needs_auth ? "" : "not ",
+			 ctrl->concat ? ", secure concatenation" : "");
+	return (u32)ctrl->cntlid |
+		(needs_auth ? 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;
+	struct nvmet_alloc_ctrl_args args = {
+		.port = req->port,
+		.sq = req->sq,
+		.ops = req->ops,
+		.p2p_client = req->p2p_client,
+		.kato = le32_to_cpu(c->kato),
+	};
+
+	if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
+		return;
+
+	d = kmalloc_obj(*d);
+	if (!d) {
+		args.status = NVME_SC_INTERNAL;
+		goto complete;
+	}
+
+	args.status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
+	if (args.status)
+		goto out;
+
+	if (c->recfmt != 0) {
+		pr_warn("invalid connect version (%d).\n",
+			le16_to_cpu(c->recfmt));
+		args.error_loc = offsetof(struct nvmf_connect_command, recfmt);
+		args.status = NVME_SC_CONNECT_FORMAT | NVME_STATUS_DNR;
+		goto out;
+	}
+
+	if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
+		pr_warn("connect attempt for invalid controller ID %#x\n",
+			d->cntlid);
+		args.status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR;
+		args.result = IPO_IATTR_CONNECT_DATA(cntlid);
+		goto out;
+	}
+
+	d->subsysnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
+	d->hostnqn[NVMF_NQN_FIELD_LEN - 1] = '\0';
+
+	args.subsysnqn = d->subsysnqn;
+	args.hostnqn = d->hostnqn;
+	args.hostid = &d->hostid;
+	args.kato = le32_to_cpu(c->kato);
+
+	ctrl = nvmet_alloc_ctrl(&args);
+	if (!ctrl)
+		goto out;
+
+	args.status = nvmet_install_queue(ctrl, req);
+	if (args.status) {
+		nvmet_ctrl_put(ctrl);
+		goto out;
+	}
+
+	args.result = cpu_to_le32(nvmet_connect_result(ctrl, req->sq));
+out:
+	kfree(d);
+complete:
+	req->error_loc = args.error_loc;
+	req->cqe->result.u32 = args.result;
+	nvmet_req_complete(req, args.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;
+
+	if (!nvmet_check_transfer_len(req, sizeof(struct nvmf_connect_data)))
+		return;
+
+	d = kmalloc_obj(*d);
+	if (!d) {
+		status = NVME_SC_INTERNAL;
+		goto complete;
+	}
+
+	status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
+	if (status)
+		goto out;
+
+	if (c->recfmt != 0) {
+		pr_warn("invalid connect version (%d).\n",
+			le16_to_cpu(c->recfmt));
+		status = NVME_SC_CONNECT_FORMAT | NVME_STATUS_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_STATUS_DNR;
+		goto out;
+	}
+
+	if (unlikely(qid > ctrl->max_qid)) {
+		pr_warn("invalid queue id (%d)\n", qid);
+		status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_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, req->sq));
+out:
+	kfree(d);
+complete:
+	nvmet_req_complete(req, status);
+	return;
+
+out_ctrl_put:
+	nvmet_ctrl_put(ctrl);
+	goto out;
+}
+
+u32 nvmet_connect_cmd_data_len(struct nvmet_req *req)
+{
+	struct nvme_command *cmd = req->cmd;
+
+	if (!nvme_is_fabrics(cmd) ||
+	    cmd->fabrics.fctype != nvme_fabrics_type_connect)
+		return 0;
+
+	return sizeof(struct nvmf_connect_data);
+}
+
+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_STATUS_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_STATUS_DNR;
+	}
+
+	if (cmd->connect.qid == 0)
+		req->execute = nvmet_execute_admin_connect;
+	else
+		req->execute = nvmet_execute_io_connect;
+	return 0;
+}