![Parav Pandit](/assets/img/avatar_default.png)
This patch introduces helper function for checking controller status during admin and io command processing which returns u16 status. As to bring consistency on returning status, other friend functions also now return u16 status instead of int to match the spec. As part of the theseerror log prints in also prints qid on which command error occured. Signed-off-by: Parav Pandit <parav@mellanox.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Jens Axboe <axboe@fb.com>
221 lines
5.9 KiB
C
221 lines
5.9 KiB
C
/*
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* Discovery service for the NVMe over Fabrics target.
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* Copyright (C) 2016 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/slab.h>
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#include <generated/utsrelease.h>
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#include "nvmet.h"
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struct nvmet_subsys *nvmet_disc_subsys;
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u64 nvmet_genctr;
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void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port)
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{
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down_write(&nvmet_config_sem);
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if (list_empty(&port->entry)) {
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list_add_tail(&port->entry, &parent->referrals);
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port->enabled = true;
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nvmet_genctr++;
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}
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up_write(&nvmet_config_sem);
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}
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void nvmet_referral_disable(struct nvmet_port *port)
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{
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down_write(&nvmet_config_sem);
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if (!list_empty(&port->entry)) {
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port->enabled = false;
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list_del_init(&port->entry);
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nvmet_genctr++;
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}
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up_write(&nvmet_config_sem);
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}
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static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
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struct nvmet_port *port, char *subsys_nqn, u8 type, u32 numrec)
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{
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struct nvmf_disc_rsp_page_entry *e = &hdr->entries[numrec];
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e->trtype = port->disc_addr.trtype;
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e->adrfam = port->disc_addr.adrfam;
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e->treq = port->disc_addr.treq;
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e->portid = port->disc_addr.portid;
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/* we support only dynamic controllers */
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e->cntlid = cpu_to_le16(NVME_CNTLID_DYNAMIC);
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e->asqsz = cpu_to_le16(NVMF_AQ_DEPTH);
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e->subtype = type;
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memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE);
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memcpy(e->traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
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memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE);
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memcpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
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}
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static void nvmet_execute_get_disc_log_page(struct nvmet_req *req)
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{
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const int entry_size = sizeof(struct nvmf_disc_rsp_page_entry);
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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struct nvmf_disc_rsp_page_hdr *hdr;
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size_t data_len = nvmet_get_log_page_len(req->cmd);
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size_t alloc_len = max(data_len, sizeof(*hdr));
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int residual_len = data_len - sizeof(*hdr);
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struct nvmet_subsys_link *p;
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struct nvmet_port *r;
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u32 numrec = 0;
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u16 status = 0;
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/*
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* Make sure we're passing at least a buffer of response header size.
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* If host provided data len is less than the header size, only the
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* number of bytes requested by host will be sent to host.
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*/
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hdr = kzalloc(alloc_len, GFP_KERNEL);
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if (!hdr) {
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status = NVME_SC_INTERNAL;
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goto out;
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}
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down_read(&nvmet_config_sem);
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list_for_each_entry(p, &req->port->subsystems, entry) {
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if (!nvmet_host_allowed(req, p->subsys, ctrl->hostnqn))
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continue;
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if (residual_len >= entry_size) {
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nvmet_format_discovery_entry(hdr, req->port,
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p->subsys->subsysnqn,
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NVME_NQN_NVME, numrec);
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residual_len -= entry_size;
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}
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numrec++;
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}
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list_for_each_entry(r, &req->port->referrals, entry) {
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if (residual_len >= entry_size) {
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nvmet_format_discovery_entry(hdr, r,
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NVME_DISC_SUBSYS_NAME,
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NVME_NQN_DISC, numrec);
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residual_len -= entry_size;
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}
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numrec++;
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}
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hdr->genctr = cpu_to_le64(nvmet_genctr);
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hdr->numrec = cpu_to_le64(numrec);
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hdr->recfmt = cpu_to_le16(0);
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up_read(&nvmet_config_sem);
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status = nvmet_copy_to_sgl(req, 0, hdr, data_len);
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kfree(hdr);
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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_identify_disc_ctrl(struct nvmet_req *req)
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{
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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struct nvme_id_ctrl *id;
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u16 status = 0;
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id = kzalloc(sizeof(*id), GFP_KERNEL);
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if (!id) {
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status = NVME_SC_INTERNAL;
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goto out;
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}
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memset(id->fr, ' ', sizeof(id->fr));
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strncpy((char *)id->fr, UTS_RELEASE, sizeof(id->fr));
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/* no limit on data transfer sizes for now */
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id->mdts = 0;
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id->cntlid = cpu_to_le16(ctrl->cntlid);
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id->ver = cpu_to_le32(ctrl->subsys->ver);
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id->lpa = (1 << 2);
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/* no enforcement soft-limit for maxcmd - pick arbitrary high value */
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id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
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id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
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if (ctrl->ops->has_keyed_sgls)
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id->sgls |= cpu_to_le32(1 << 2);
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if (ctrl->ops->sqe_inline_size)
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id->sgls |= cpu_to_le32(1 << 20);
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strcpy(id->subnqn, ctrl->subsys->subsysnqn);
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status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
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kfree(id);
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out:
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nvmet_req_complete(req, status);
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}
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u16 nvmet_parse_discovery_cmd(struct nvmet_req *req)
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{
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struct nvme_command *cmd = req->cmd;
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req->ns = NULL;
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if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
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pr_err("got cmd %d while not ready\n",
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cmd->common.opcode);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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switch (cmd->common.opcode) {
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case nvme_admin_get_log_page:
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req->data_len = nvmet_get_log_page_len(cmd);
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switch (cmd->get_log_page.lid) {
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case NVME_LOG_DISC:
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req->execute = nvmet_execute_get_disc_log_page;
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return 0;
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default:
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pr_err("unsupported get_log_page lid %d\n",
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cmd->get_log_page.lid);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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case nvme_admin_identify:
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req->data_len = 4096;
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switch (cmd->identify.cns) {
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case NVME_ID_CNS_CTRL:
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req->execute =
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nvmet_execute_identify_disc_ctrl;
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return 0;
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default:
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pr_err("unsupported identify cns %d\n",
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cmd->identify.cns);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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default:
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pr_err("unsupported cmd %d\n", cmd->common.opcode);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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pr_err("unhandled cmd %d\n", cmd->common.opcode);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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int __init nvmet_init_discovery(void)
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{
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nvmet_disc_subsys =
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nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_DISC);
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if (!nvmet_disc_subsys)
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return -ENOMEM;
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return 0;
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}
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void nvmet_exit_discovery(void)
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{
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nvmet_subsys_put(nvmet_disc_subsys);
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}
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