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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023-2024 Chelsio Communications, Inc.
* Written by: John Baldwin <jhb@FreeBSD.org>
*/
#include <err.h>
#include <errno.h>
#include <libnvmf.h>
#include <stdlib.h>
#include "internal.h"
struct controller {
struct nvmf_qpair *qp;
uint64_t cap;
uint32_t vs;
uint32_t cc;
uint32_t csts;
bool shutdown;
struct nvme_controller_data cdata;
};
static bool
update_cc(struct controller *c, uint32_t new_cc)
{
uint32_t changes;
if (c->shutdown)
return (false);
if (!nvmf_validate_cc(c->qp, c->cap, c->cc, new_cc))
return (false);
changes = c->cc ^ new_cc;
c->cc = new_cc;
/* Handle shutdown requests. */
if (NVMEV(NVME_CC_REG_SHN, changes) != 0 &&
NVMEV(NVME_CC_REG_SHN, new_cc) != 0) {
c->csts &= ~NVMEM(NVME_CSTS_REG_SHST);
c->csts |= NVMEF(NVME_CSTS_REG_SHST, NVME_SHST_COMPLETE);
c->shutdown = true;
}
if (NVMEV(NVME_CC_REG_EN, changes) != 0) {
if (NVMEV(NVME_CC_REG_EN, new_cc) == 0) {
/* Controller reset. */
c->csts = 0;
c->shutdown = true;
} else
c->csts |= NVMEF(NVME_CSTS_REG_RDY, 1);
}
return (true);
}
static void
handle_property_get(const struct controller *c, const struct nvmf_capsule *nc,
const struct nvmf_fabric_prop_get_cmd *pget)
{
struct nvmf_fabric_prop_get_rsp rsp;
nvmf_init_cqe(&rsp, nc, 0);
switch (le32toh(pget->ofst)) {
case NVMF_PROP_CAP:
if (pget->attrib.size != NVMF_PROP_SIZE_8)
goto error;
rsp.value.u64 = htole64(c->cap);
break;
case NVMF_PROP_VS:
if (pget->attrib.size != NVMF_PROP_SIZE_4)
goto error;
rsp.value.u32.low = htole32(c->vs);
break;
case NVMF_PROP_CC:
if (pget->attrib.size != NVMF_PROP_SIZE_4)
goto error;
rsp.value.u32.low = htole32(c->cc);
break;
case NVMF_PROP_CSTS:
if (pget->attrib.size != NVMF_PROP_SIZE_4)
goto error;
rsp.value.u32.low = htole32(c->csts);
break;
default:
goto error;
}
nvmf_send_response(nc, &rsp);
return;
error:
nvmf_send_generic_error(nc, NVME_SC_INVALID_FIELD);
}
static void
handle_property_set(struct controller *c, const struct nvmf_capsule *nc,
const struct nvmf_fabric_prop_set_cmd *pset)
{
switch (le32toh(pset->ofst)) {
case NVMF_PROP_CC:
if (pset->attrib.size != NVMF_PROP_SIZE_4)
goto error;
if (!update_cc(c, le32toh(pset->value.u32.low)))
goto error;
break;
default:
goto error;
}
nvmf_send_success(nc);
return;
error:
nvmf_send_generic_error(nc, NVME_SC_INVALID_FIELD);
}
static void
handle_fabrics_command(struct controller *c,
const struct nvmf_capsule *nc, const struct nvmf_fabric_cmd *fc)
{
switch (fc->fctype) {
case NVMF_FABRIC_COMMAND_PROPERTY_GET:
handle_property_get(c, nc,
(const struct nvmf_fabric_prop_get_cmd *)fc);
break;
case NVMF_FABRIC_COMMAND_PROPERTY_SET:
handle_property_set(c, nc,
(const struct nvmf_fabric_prop_set_cmd *)fc);
break;
case NVMF_FABRIC_COMMAND_CONNECT:
warnx("CONNECT command on connected queue");
nvmf_send_generic_error(nc, NVME_SC_COMMAND_SEQUENCE_ERROR);
break;
case NVMF_FABRIC_COMMAND_DISCONNECT:
warnx("DISCONNECT command on admin queue");
nvmf_send_error(nc, NVME_SCT_COMMAND_SPECIFIC,
NVMF_FABRIC_SC_INVALID_QUEUE_TYPE);
break;
default:
warnx("Unsupported fabrics command %#x", fc->fctype);
nvmf_send_generic_error(nc, NVME_SC_INVALID_OPCODE);
break;
}
}
static void
handle_identify_command(const struct controller *c,
const struct nvmf_capsule *nc, const struct nvme_command *cmd)
{
uint8_t cns;
cns = le32toh(cmd->cdw10) & 0xFF;
switch (cns) {
case 1:
break;
default:
warnx("Unsupported CNS %#x for IDENTIFY", cns);
goto error;
}
nvmf_send_controller_data(nc, &c->cdata, sizeof(c->cdata));
return;
error:
nvmf_send_generic_error(nc, NVME_SC_INVALID_FIELD);
}
void
controller_handle_admin_commands(struct controller *c, handle_command *cb,
void *cb_arg)
{
struct nvmf_qpair *qp = c->qp;
const struct nvme_command *cmd;
struct nvmf_capsule *nc;
int error;
for (;;) {
error = nvmf_controller_receive_capsule(qp, &nc);
if (error != 0) {
if (error != ECONNRESET)
warnc(error, "Failed to read command capsule");
break;
}
cmd = nvmf_capsule_sqe(nc);
/*
* Only permit Fabrics commands while a controller is
* disabled.
*/
if (NVMEV(NVME_CC_REG_EN, c->cc) == 0 &&
cmd->opc != NVME_OPC_FABRICS_COMMANDS) {
warnx("Unsupported admin opcode %#x whiled disabled\n",
cmd->opc);
nvmf_send_generic_error(nc,
NVME_SC_COMMAND_SEQUENCE_ERROR);
nvmf_free_capsule(nc);
continue;
}
if (cb(nc, cmd, cb_arg)) {
nvmf_free_capsule(nc);
continue;
}
switch (cmd->opc) {
case NVME_OPC_FABRICS_COMMANDS:
handle_fabrics_command(c, nc,
(const struct nvmf_fabric_cmd *)cmd);
break;
case NVME_OPC_IDENTIFY:
handle_identify_command(c, nc, cmd);
break;
default:
warnx("Unsupported admin opcode %#x", cmd->opc);
nvmf_send_generic_error(nc, NVME_SC_INVALID_OPCODE);
break;
}
nvmf_free_capsule(nc);
}
}
struct controller *
init_controller(struct nvmf_qpair *qp,
const struct nvme_controller_data *cdata)
{
struct controller *c;
c = calloc(1, sizeof(*c));
c->qp = qp;
c->cap = nvmf_controller_cap(c->qp);
c->vs = cdata->ver;
c->cdata = *cdata;
return (c);
}
void
free_controller(struct controller *c)
{
free(c);
}
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