* [PATCH v4 0/3] hw/{i2c,nvme}: mctp endpoint, nvme management interface model
@ 2023-08-23 9:21 Klaus Jensen
2023-08-23 9:21 ` [PATCH v4 1/3] hw/i2c: add smbus pec utility function Klaus Jensen
` (2 more replies)
0 siblings, 3 replies; 8+ messages in thread
From: Klaus Jensen @ 2023-08-23 9:21 UTC (permalink / raw)
To: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch
Cc: Lior Weintraub, Jeremy Kerr, Matt Johnston, Peter Delevoryas,
Jonathan Cameron, Klaus Jensen, qemu-devel, qemu-arm, qemu-block,
Klaus Jensen
This adds a generic MCTP endpoint model that other devices may derive
from.
Also included is a very basic implementation of an NVMe-MI device,
supporting only a small subset of the required commands.
Since this all relies on i2c target mode, this can currently only be
used with an SoC that includes the Aspeed I2C controller.
The easiest way to get up and running with this, is to grab my buildroot
overlay[1] (aspeed_ast2600evb_nmi_defconfig). It includes modified a
modified dts as well as a couple of required packages.
QEMU can then be launched along these lines:
qemu-system-arm \
-nographic \
-M ast2600-evb \
-kernel output/images/zImage \
-initrd output/images/rootfs.cpio \
-dtb output/images/aspeed-ast2600-evb-nmi.dtb \
-nic user,hostfwd=tcp::2222-:22 \
-device nmi-i2c,address=0x3a \
-serial mon:stdio
From within the booted system,
mctp addr add 8 dev mctpi2c15
mctp link set mctpi2c15 up
mctp route add 9 via mctpi2c15
mctp neigh add 9 dev mctpi2c15 lladdr 0x3a
mi-mctp 1 9 info
Comments are very welcome!
[1]: https://github.com/birkelund/hwtests/tree/main/br2-external
Changes since v3
~~~~~~~~~~~~~~~~
- Inlined the POLY define in the crc8 function (Philippe)
- Changed a bunch of fields to use registerfields.h
- From Jonathan:
+ Added references to specs defining the structures.
- From Corey:
+ Reworked the buffer handling (again) ;)
Derived devices can now never write into the mctp core buffers. Instead,
the mctp core will request a buffer pointer and copy from there.
Internally, within the mctp core, writes to internal buffers are also
checked.
Changes since v2
~~~~~~~~~~~~~~~~
- Applied a bunch of feedback from Jonathan:
+ Moved a lot of internally used structs out of the include headers
and into the source files.
+ Added spec references in various places
+ Split the patch for i2c_smbus_pec() into its own
+ Fix a compile error (and bug) in nmi-i2c.c.
- From Corey:
+ Reworked the buffer handling. The deriving devices now returns a
pointer to their own buffer that the mctp core copies into.
+ Added a couple of extra debugging trace events.
Changes since v1
~~~~~~~~~~~~~~~~
- Fix SPDX-License tag for hw/nvme/nmi-i2c.c (Philippe)
- Add some asserts to verify buffer indices (by request from Corey).
- Drop short packets that could result in underflow (Corey)
- Move i2c_smbus_pec() to smbus common code (Corey)
- A couple of logic fixes (patch from Jeremy squashed in)
- Added a patch to handle messages with dest eid 0 (Matt)
Maybe squash this as well.
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
Klaus Jensen (3):
hw/i2c: add smbus pec utility function
hw/i2c: add mctp core
hw/nvme: add nvme management interface model
MAINTAINERS | 7 +
hw/arm/Kconfig | 1 +
hw/i2c/Kconfig | 4 +
hw/i2c/mctp.c | 428 ++++++++++++++++++++++++++++++++++++++++++
hw/i2c/meson.build | 1 +
hw/i2c/smbus_master.c | 26 +++
hw/i2c/trace-events | 13 ++
hw/nvme/Kconfig | 4 +
hw/nvme/meson.build | 1 +
hw/nvme/nmi-i2c.c | 418 +++++++++++++++++++++++++++++++++++++++++
hw/nvme/trace-events | 6 +
include/hw/i2c/mctp.h | 127 +++++++++++++
include/hw/i2c/smbus_master.h | 2 +
include/net/mctp.h | 35 ++++
14 files changed, 1073 insertions(+)
---
base-commit: b0dd9a7d6dd15a6898e9c585b521e6bec79b25aa
change-id: 20230822-nmi-i2c-d804ed5be7e6
Best regards,
--
Klaus Jensen <k.jensen@samsung.com>
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH v4 1/3] hw/i2c: add smbus pec utility function
2023-08-23 9:21 [PATCH v4 0/3] hw/{i2c,nvme}: mctp endpoint, nvme management interface model Klaus Jensen
@ 2023-08-23 9:21 ` Klaus Jensen
2023-08-30 13:04 ` Jonathan Cameron via
2023-08-23 9:21 ` [PATCH v4 2/3] hw/i2c: add mctp core Klaus Jensen
2023-08-23 9:22 ` [PATCH v4 3/3] hw/nvme: add nvme management interface model Klaus Jensen
2 siblings, 1 reply; 8+ messages in thread
From: Klaus Jensen @ 2023-08-23 9:21 UTC (permalink / raw)
To: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch
Cc: Lior Weintraub, Jeremy Kerr, Matt Johnston, Peter Delevoryas,
Jonathan Cameron, Klaus Jensen, qemu-devel, qemu-arm, qemu-block,
Klaus Jensen
From: Klaus Jensen <k.jensen@samsung.com>
Add i2c_smbus_pec() to calculate the SMBus Packet Error Code for a
message.
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
hw/i2c/smbus_master.c | 26 ++++++++++++++++++++++++++
include/hw/i2c/smbus_master.h | 2 ++
2 files changed, 28 insertions(+)
diff --git a/hw/i2c/smbus_master.c b/hw/i2c/smbus_master.c
index 6a53c34e70b7..01a8e4700222 100644
--- a/hw/i2c/smbus_master.c
+++ b/hw/i2c/smbus_master.c
@@ -15,6 +15,32 @@
#include "hw/i2c/i2c.h"
#include "hw/i2c/smbus_master.h"
+static uint8_t crc8(uint16_t data)
+{
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ if (data & 0x8000) {
+ data ^= 0x1070U << 3;
+ }
+
+ data <<= 1;
+ }
+
+ return (uint8_t)(data >> 8);
+}
+
+uint8_t i2c_smbus_pec(uint8_t crc, uint8_t *buf, size_t len)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ crc = crc8((crc ^ buf[i]) << 8);
+ }
+
+ return crc;
+}
+
/* Master device commands. */
int smbus_quick_command(I2CBus *bus, uint8_t addr, int read)
{
diff --git a/include/hw/i2c/smbus_master.h b/include/hw/i2c/smbus_master.h
index bb13bc423c22..d90f81767d86 100644
--- a/include/hw/i2c/smbus_master.h
+++ b/include/hw/i2c/smbus_master.h
@@ -27,6 +27,8 @@
#include "hw/i2c/i2c.h"
+uint8_t i2c_smbus_pec(uint8_t crc, uint8_t *buf, size_t len);
+
/* Master device commands. */
int smbus_quick_command(I2CBus *bus, uint8_t addr, int read);
int smbus_receive_byte(I2CBus *bus, uint8_t addr);
--
2.42.0
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH v4 2/3] hw/i2c: add mctp core
2023-08-23 9:21 [PATCH v4 0/3] hw/{i2c,nvme}: mctp endpoint, nvme management interface model Klaus Jensen
2023-08-23 9:21 ` [PATCH v4 1/3] hw/i2c: add smbus pec utility function Klaus Jensen
@ 2023-08-23 9:21 ` Klaus Jensen
2023-08-30 14:31 ` Jonathan Cameron via
2023-08-23 9:22 ` [PATCH v4 3/3] hw/nvme: add nvme management interface model Klaus Jensen
2 siblings, 1 reply; 8+ messages in thread
From: Klaus Jensen @ 2023-08-23 9:21 UTC (permalink / raw)
To: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch
Cc: Lior Weintraub, Jeremy Kerr, Matt Johnston, Peter Delevoryas,
Jonathan Cameron, Klaus Jensen, qemu-devel, qemu-arm, qemu-block,
Klaus Jensen
From: Klaus Jensen <k.jensen@samsung.com>
Add an abstract MCTP over I2C endpoint model. This implements MCTP
control message handling as well as handling the actual I2C transport
(packetization).
Devices are intended to derive from this and implement the class
methods.
Parts of this implementation is inspired by code[1] previously posted by
Jonathan Cameron.
Squashed a fix[2] from Matt Johnston.
[1]: https://lore.kernel.org/qemu-devel/20220520170128.4436-1-Jonathan.Cameron@huawei.com/
[2]: https://lore.kernel.org/qemu-devel/20221121080445.GA29062@codeconstruct.com.au/
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
MAINTAINERS | 7 +
hw/arm/Kconfig | 1 +
hw/i2c/Kconfig | 4 +
hw/i2c/mctp.c | 428 ++++++++++++++++++++++++++++++++++++++++++++++++++
hw/i2c/meson.build | 1 +
hw/i2c/trace-events | 13 ++
include/hw/i2c/mctp.h | 127 +++++++++++++++
include/net/mctp.h | 35 +++++
8 files changed, 616 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 6111b6b4d928..8ca71167607d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3395,6 +3395,13 @@ F: tests/qtest/adm1272-test.c
F: tests/qtest/max34451-test.c
F: tests/qtest/isl_pmbus_vr-test.c
+MCTP I2C Transport
+M: Klaus Jensen <k.jensen@samsung.com>
+S: Maintained
+F: hw/i2c/mctp.c
+F: include/hw/i2c/mctp.h
+F: include/net/mctp.h
+
Firmware schema specifications
M: Philippe Mathieu-Daudé <philmd@linaro.org>
R: Daniel P. Berrange <berrange@redhat.com>
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 7e6834844051..5bcb1e0e8a6f 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -541,6 +541,7 @@ config ASPEED_SOC
select DS1338
select FTGMAC100
select I2C
+ select I2C_MCTP
select DPS310
select PCA9552
select SERIAL
diff --git a/hw/i2c/Kconfig b/hw/i2c/Kconfig
index 14886b35dac2..2b2a50b83d1e 100644
--- a/hw/i2c/Kconfig
+++ b/hw/i2c/Kconfig
@@ -6,6 +6,10 @@ config I2C_DEVICES
# to any board's i2c bus
bool
+config I2C_MCTP
+ bool
+ select I2C
+
config SMBUS
bool
select I2C
diff --git a/hw/i2c/mctp.c b/hw/i2c/mctp.c
new file mode 100644
index 000000000000..217073d62435
--- /dev/null
+++ b/hw/i2c/mctp.c
@@ -0,0 +1,428 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2023 Samsung Electronics Co., Ltd.
+ * SPDX-FileContributor: Klaus Jensen <k.jensen@samsung.com>
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/main-loop.h"
+
+#include "hw/qdev-properties.h"
+#include "hw/i2c/i2c.h"
+#include "hw/i2c/smbus_master.h"
+#include "hw/i2c/mctp.h"
+#include "net/mctp.h"
+
+#include "trace.h"
+
+/* DSP0237 1.2.0, Figure 1 */
+typedef struct MCTPI2CPacketHeader {
+ uint8_t dest;
+#define MCTP_I2C_COMMAND_CODE 0xf
+ uint8_t command_code;
+ uint8_t byte_count;
+ uint8_t source;
+} MCTPI2CPacketHeader;
+
+typedef struct MCTPI2CPacket {
+ MCTPI2CPacketHeader i2c;
+ MCTPPacket mctp;
+} MCTPI2CPacket;
+
+#define i2c_mctp_payload_offset offsetof(MCTPI2CPacket, mctp.payload)
+#define i2c_mctp_payload(buf) (buf + i2c_mctp_payload_offset)
+
+/* DSP0236 1.3.0, Figure 20 */
+typedef struct MCTPControlMessage {
+#define MCTP_MESSAGE_TYPE_CONTROL 0x0
+ uint8_t type;
+#define MCTP_CONTROL_FLAGS_RQ (1 << 7)
+#define MCTP_CONTROL_FLAGS_D (1 << 6)
+ uint8_t flags;
+ uint8_t command_code;
+ uint8_t data[];
+} MCTPControlMessage;
+
+enum MCTPControlCommandCodes {
+ MCTP_CONTROL_SET_EID = 0x01,
+ MCTP_CONTROL_GET_EID = 0x02,
+ MCTP_CONTROL_GET_VERSION = 0x04,
+ MCTP_CONTROL_GET_MESSAGE_TYPE_SUPPORT = 0x05,
+};
+
+#define MCTP_CONTROL_ERROR_UNSUPPORTED_CMD 0x5
+
+#define i2c_mctp_control_data_offset \
+ (i2c_mctp_payload_offset + offsetof(MCTPControlMessage, data))
+#define i2c_mctp_control_data(buf) (buf + i2c_mctp_control_data_offset)
+
+/**
+ * The byte count field in the SMBUS Block Write containers the number of bytes
+ * *following* the field itself.
+ *
+ * This is at least 5.
+ *
+ * 1 byte for the MCTP/I2C piggy-backed I2C source address in addition to the
+ * size of the MCTP transport/packet header.
+ */
+#define MCTP_I2C_BYTE_COUNT_OFFSET (sizeof(MCTPPacketHeader) + 1)
+
+void i2c_mctp_schedule_send(MCTPI2CEndpoint *mctp)
+{
+ I2CBus *i2c = I2C_BUS(qdev_get_parent_bus(DEVICE(mctp)));
+
+ mctp->tx.state = I2C_MCTP_STATE_TX_START_SEND;
+
+ i2c_bus_master(i2c, mctp->tx.bh);
+}
+
+static void i2c_mctp_tx(void *opaque)
+{
+ DeviceState *dev = DEVICE(opaque);
+ I2CBus *i2c = I2C_BUS(qdev_get_parent_bus(dev));
+ I2CSlave *slave = I2C_SLAVE(dev);
+ MCTPI2CEndpoint *mctp = MCTP_I2C_ENDPOINT(dev);
+ MCTPI2CEndpointClass *mc = MCTP_I2C_ENDPOINT_GET_CLASS(mctp);
+ MCTPI2CPacket *pkt = (MCTPI2CPacket *)mctp->buffer;
+ uint8_t flags = 0;
+
+ switch (mctp->tx.state) {
+ case I2C_MCTP_STATE_TX_SEND_BYTE:
+ if (mctp->pos < mctp->len) {
+ uint8_t byte = mctp->buffer[mctp->pos];
+
+ trace_i2c_mctp_tx_send_byte(mctp->pos, byte);
+
+ /* send next byte */
+ i2c_send_async(i2c, byte);
+
+ mctp->pos++;
+
+ break;
+ }
+
+ /* packet sent */
+ i2c_end_transfer(i2c);
+
+ /* end of any control data */
+ mctp->len = 0;
+
+ /* fall through */
+
+ case I2C_MCTP_STATE_TX_START_SEND:
+ if (mctp->tx.is_control) {
+ /* packet payload is already in buffer; max 1 packet */
+ flags = FIELD_DP8(flags, MCTP_H_FLAGS, SOM, 1);
+ flags = FIELD_DP8(flags, MCTP_H_FLAGS, EOM, 1);
+ } else {
+ const uint8_t *payload;
+
+ /* get message bytes from derived device */
+ mctp->len = mc->get_buf(mctp, &payload, I2C_MCTP_MAXMTU, &flags);
+ assert(mctp->len <= I2C_MCTP_MAXMTU);
+
+ memcpy(pkt->mctp.payload, payload, mctp->len);
+ }
+
+ if (!mctp->len) {
+ trace_i2c_mctp_tx_done();
+
+ /* no more packets needed; release the bus */
+ i2c_bus_release(i2c);
+
+ mctp->state = I2C_MCTP_STATE_IDLE;
+ mctp->tx.is_control = false;
+
+ break;
+ }
+
+ mctp->state = I2C_MCTP_STATE_TX;
+
+ pkt->i2c = (MCTPI2CPacketHeader) {
+ .dest = mctp->tx.addr << 1,
+ .command_code = MCTP_I2C_COMMAND_CODE,
+ .byte_count = MCTP_I2C_BYTE_COUNT_OFFSET + mctp->len,
+
+ /* DSP0237 1.2.0, Figure 1 */
+ .source = slave->address << 1 | 0x1,
+ };
+
+ pkt->mctp.hdr = (MCTPPacketHeader) {
+ .version = 0x1,
+ .eid.dest = mctp->tx.eid,
+ .eid.source = mctp->my_eid,
+ .flags = flags,
+ };
+
+ pkt->mctp.hdr.flags = FIELD_DP8(pkt->mctp.hdr.flags, MCTP_H_FLAGS,
+ PKTSEQ, mctp->tx.pktseq++);
+ pkt->mctp.hdr.flags = FIELD_DP8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, TAG,
+ mctp->tx.tag);
+
+ mctp->len += sizeof(MCTPI2CPacket);
+ assert(mctp->len < I2C_MCTP_MAX_LENGTH);
+
+ mctp->buffer[mctp->len] = i2c_smbus_pec(0, mctp->buffer, mctp->len);
+ mctp->len++;
+
+ trace_i2c_mctp_tx_start_send(mctp->len);
+
+ i2c_start_send_async(i2c, pkt->i2c.dest >> 1);
+
+ /* already "sent" the destination slave address */
+ mctp->pos = 1;
+
+ mctp->tx.state = I2C_MCTP_STATE_TX_SEND_BYTE;
+
+ break;
+ }
+}
+
+static void i2c_mctp_set_control_data(MCTPI2CEndpoint *mctp, const void * buf,
+ size_t len)
+{
+ assert(i2c_mctp_control_data_offset < I2C_MCTP_MAX_LENGTH - len);
+ memcpy(i2c_mctp_control_data(mctp->buffer), buf, len);
+
+ assert(mctp->len < I2C_MCTP_MAX_LENGTH - len);
+ mctp->len += len;
+}
+
+static void i2c_mctp_handle_control_set_eid(MCTPI2CEndpoint *mctp, uint8_t eid)
+{
+ mctp->my_eid = eid;
+
+ uint8_t buf[] = {
+ 0x0, 0x0, eid, 0x0,
+ };
+
+ i2c_mctp_set_control_data(mctp, buf, sizeof(buf));
+}
+
+static void i2c_mctp_handle_control_get_eid(MCTPI2CEndpoint *mctp)
+{
+ uint8_t buf[] = {
+ 0x0, mctp->my_eid, 0x0, 0x0,
+ };
+
+ i2c_mctp_set_control_data(mctp, buf, sizeof(buf));
+}
+
+static void i2c_mctp_handle_control_get_version(MCTPI2CEndpoint *mctp)
+{
+ uint8_t buf[] = {
+ 0x0, 0x1, 0x0, 0x1, 0x3, 0x1,
+ };
+
+ i2c_mctp_set_control_data(mctp, buf, sizeof(buf));
+}
+
+static void i2c_mctp_handle_get_message_type_support(MCTPI2CEndpoint *mctp)
+{
+ MCTPI2CEndpointClass *mc = MCTP_I2C_ENDPOINT_GET_CLASS(mctp);
+ const uint8_t *types;
+ size_t len;
+
+ len = mc->get_types(mctp, &types);
+ assert(mctp->len <= MCTP_BASELINE_MTU - len);
+
+ i2c_mctp_set_control_data(mctp, types, len);
+}
+
+static void i2c_mctp_handle_control(MCTPI2CEndpoint *mctp)
+{
+ MCTPControlMessage *msg = (MCTPControlMessage *)i2c_mctp_payload(mctp->buffer);
+
+ /* clear Rq/D */
+ msg->flags &= ~(MCTP_CONTROL_FLAGS_RQ | MCTP_CONTROL_FLAGS_D);
+
+ mctp->len = sizeof(MCTPControlMessage);
+
+ trace_i2c_mctp_handle_control(msg->command_code);
+
+ switch (msg->command_code) {
+ case MCTP_CONTROL_SET_EID:
+ i2c_mctp_handle_control_set_eid(mctp, msg->data[1]);
+ break;
+
+ case MCTP_CONTROL_GET_EID:
+ i2c_mctp_handle_control_get_eid(mctp);
+ break;
+
+ case MCTP_CONTROL_GET_VERSION:
+ i2c_mctp_handle_control_get_version(mctp);
+ break;
+
+ case MCTP_CONTROL_GET_MESSAGE_TYPE_SUPPORT:
+ i2c_mctp_handle_get_message_type_support(mctp);
+ break;
+
+ default:
+ trace_i2c_mctp_unhandled_control(msg->command_code);
+
+ msg->data[0] = MCTP_CONTROL_ERROR_UNSUPPORTED_CMD;
+ mctp->len++;
+
+ break;
+ }
+
+ assert(mctp->len <= MCTP_BASELINE_MTU);
+
+ i2c_mctp_schedule_send(mctp);
+}
+
+static int i2c_mctp_event_cb(I2CSlave *i2c, enum i2c_event event)
+{
+ MCTPI2CEndpoint *mctp = MCTP_I2C_ENDPOINT(i2c);
+ MCTPI2CEndpointClass *mc = MCTP_I2C_ENDPOINT_GET_CLASS(mctp);
+ MCTPI2CPacket *pkt = (MCTPI2CPacket *)mctp->buffer;
+ size_t payload_len;
+ uint8_t pec, pktseq, msgtype;
+
+ switch (event) {
+ case I2C_START_SEND:
+ if (mctp->state == I2C_MCTP_STATE_IDLE) {
+ mctp->state = I2C_MCTP_STATE_RX_STARTED;
+ } else if (mctp->state != I2C_MCTP_STATE_RX) {
+ return -1;
+ }
+
+ /* the i2c core eats the slave address, so put it back in */
+ pkt->i2c.dest = i2c->address << 1;
+ mctp->len = 1;
+
+ return 0;
+
+ case I2C_FINISH:
+ if (mctp->len < sizeof(MCTPI2CPacket) + 1) {
+ trace_i2c_mctp_drop_short_packet(mctp->len);
+ goto drop;
+ }
+
+ payload_len = mctp->len - (1 + offsetof(MCTPI2CPacket, mctp.payload));
+
+ if (pkt->i2c.byte_count + 3 != mctp->len - 1) {
+ trace_i2c_mctp_drop_invalid_length(pkt->i2c.byte_count + 3,
+ mctp->len - 1);
+ goto drop;
+ }
+
+ pec = i2c_smbus_pec(0, mctp->buffer, mctp->len - 1);
+ if (mctp->buffer[mctp->len - 1] != pec) {
+ trace_i2c_mctp_drop_invalid_pec(mctp->buffer[mctp->len - 1], pec);
+ goto drop;
+ }
+
+ if (!(pkt->mctp.hdr.eid.dest == mctp->my_eid ||
+ pkt->mctp.hdr.eid.dest == 0)) {
+ trace_i2c_mctp_drop_invalid_eid(pkt->mctp.hdr.eid.dest,
+ mctp->my_eid);
+ goto drop;
+ }
+
+ pktseq = FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, PKTSEQ);
+
+ if (FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, SOM)) {
+ mctp->tx.is_control = false;
+
+ if (mctp->state == I2C_MCTP_STATE_RX) {
+ mc->reset(mctp);
+ }
+
+ mctp->state = I2C_MCTP_STATE_RX;
+
+ mctp->tx.addr = pkt->i2c.source >> 1;
+ mctp->tx.eid = pkt->mctp.hdr.eid.source;
+ mctp->tx.tag = FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, TAG);
+ mctp->tx.pktseq = pktseq;
+
+ msgtype = FIELD_EX8(pkt->mctp.payload[0], MCTP_MESSAGE_H, TYPE);
+
+ if (msgtype == MCTP_MESSAGE_TYPE_CONTROL) {
+ mctp->tx.is_control = true;
+
+ i2c_mctp_handle_control(mctp);
+
+ return 0;
+ }
+ } else if (mctp->state == I2C_MCTP_STATE_RX_STARTED) {
+ trace_i2c_mctp_drop_expected_som();
+ goto drop;
+ } else if (pktseq != (++mctp->tx.pktseq & 0x3)) {
+ trace_i2c_mctp_drop_invalid_pktseq(pktseq, mctp->tx.pktseq & 0x3);
+ goto drop;
+ }
+
+ mc->put_buf(mctp, i2c_mctp_payload(mctp->buffer), payload_len);
+
+ if (FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, EOM)) {
+ mc->handle(mctp);
+ mctp->state = I2C_MCTP_STATE_WAIT_TX;
+ }
+
+ return 0;
+
+ default:
+ return -1;
+ }
+
+drop:
+ mc->reset(mctp);
+
+ mctp->state = I2C_MCTP_STATE_IDLE;
+
+ return 0;
+}
+
+static int i2c_mctp_send_cb(I2CSlave *i2c, uint8_t data)
+{
+ MCTPI2CEndpoint *mctp = MCTP_I2C_ENDPOINT(i2c);
+
+ if (mctp->len < I2C_MCTP_MAX_LENGTH) {
+ mctp->buffer[mctp->len++] = data;
+ return 0;
+ }
+
+ return -1;
+}
+
+static void i2c_mctp_instance_init(Object *obj)
+{
+ MCTPI2CEndpoint *mctp = MCTP_I2C_ENDPOINT(obj);
+
+ mctp->tx.bh = qemu_bh_new(i2c_mctp_tx, mctp);
+}
+
+static Property mctp_i2c_props[] = {
+ DEFINE_PROP_UINT8("eid", MCTPI2CEndpoint, my_eid, 0x9),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void i2c_mctp_class_init(ObjectClass *oc, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(oc);
+ I2CSlaveClass *k = I2C_SLAVE_CLASS(oc);
+
+ k->event = i2c_mctp_event_cb;
+ k->send = i2c_mctp_send_cb;
+
+ device_class_set_props(dc, mctp_i2c_props);
+}
+
+static const TypeInfo i2c_mctp_info = {
+ .name = TYPE_MCTP_I2C_ENDPOINT,
+ .parent = TYPE_I2C_SLAVE,
+ .abstract = true,
+ .instance_init = i2c_mctp_instance_init,
+ .instance_size = sizeof(MCTPI2CEndpoint),
+ .class_init = i2c_mctp_class_init,
+ .class_size = sizeof(MCTPI2CEndpointClass),
+};
+
+static void register_types(void)
+{
+ type_register_static(&i2c_mctp_info);
+}
+
+type_init(register_types)
diff --git a/hw/i2c/meson.build b/hw/i2c/meson.build
index b58bc167dbcd..c4bddc4f5024 100644
--- a/hw/i2c/meson.build
+++ b/hw/i2c/meson.build
@@ -1,5 +1,6 @@
i2c_ss = ss.source_set()
i2c_ss.add(when: 'CONFIG_I2C', if_true: files('core.c'))
+i2c_ss.add(when: 'CONFIG_I2C_MCTP', if_true: files('mctp.c'))
i2c_ss.add(when: 'CONFIG_SMBUS', if_true: files('smbus_slave.c', 'smbus_master.c'))
i2c_ss.add(when: 'CONFIG_ACPI_SMBUS', if_true: files('pm_smbus.c'))
i2c_ss.add(when: 'CONFIG_ACPI_ICH9', if_true: files('smbus_ich9.c'))
diff --git a/hw/i2c/trace-events b/hw/i2c/trace-events
index d7b1e25858b1..5a5c64b2652a 100644
--- a/hw/i2c/trace-events
+++ b/hw/i2c/trace-events
@@ -45,3 +45,16 @@ npcm7xx_smbus_recv_fifo(const char *id, uint8_t received, uint8_t expected) "%s
pca954x_write_bytes(uint8_t value) "PCA954X write data: 0x%02x"
pca954x_read_data(uint8_t value) "PCA954X read data: 0x%02x"
+
+# mctp.c
+i2c_mctp_tx_start_send(size_t len) "len %zu"
+i2c_mctp_tx_send_byte(size_t pos, uint8_t byte) "pos %zu byte 0x%"PRIx8""
+i2c_mctp_tx_done(void) "packet sent"
+i2c_mctp_handle_control(uint8_t command) "command 0x%"PRIx8""
+i2c_mctp_unhandled_control(uint8_t command) "command 0x%"PRIx8""
+i2c_mctp_drop_invalid_length(unsigned byte_count, size_t expected) "byte_count %u expected %zu"
+i2c_mctp_drop_invalid_pec(uint8_t pec, uint8_t expected) "pec 0x%"PRIx8" expected 0x%"PRIx8""
+i2c_mctp_drop_invalid_eid(uint8_t eid, uint8_t expected) "eid 0x%"PRIx8" expected 0x%"PRIx8""
+i2c_mctp_drop_invalid_pktseq(uint8_t pktseq, uint8_t expected) "pktseq 0x%"PRIx8" expected 0x%"PRIx8""
+i2c_mctp_drop_short_packet(size_t len) "len %zu"
+i2c_mctp_drop_expected_som(void) ""
diff --git a/include/hw/i2c/mctp.h b/include/hw/i2c/mctp.h
new file mode 100644
index 000000000000..fccbf249cdbe
--- /dev/null
+++ b/include/hw/i2c/mctp.h
@@ -0,0 +1,127 @@
+#ifndef QEMU_I2C_MCTP_H
+#define QEMU_I2C_MCTP_H
+
+#include "qom/object.h"
+#include "hw/qdev-core.h"
+
+#define TYPE_MCTP_I2C_ENDPOINT "mctp-i2c-endpoint"
+OBJECT_DECLARE_TYPE(MCTPI2CEndpoint, MCTPI2CEndpointClass, MCTP_I2C_ENDPOINT)
+
+struct MCTPI2CEndpointClass {
+ I2CSlaveClass parent_class;
+
+ /**
+ *
+ * put_buf() - receive incoming message fragment
+ *
+ * Must returns 0 for succes or -1 for error.
+ */
+ int (*put_buf)(MCTPI2CEndpoint *mctp, uint8_t *buf, size_t len);
+
+ /**
+ * get_buf() - provide pointer to message fragment
+ *
+ * Called by the mctp subsystem to request a pointer to the next message
+ * fragment. The implementation must advance its internal position such
+ * that successive calls returns the next fragments.
+ *
+ * Must return the number of bytes available.
+ */
+ size_t (*get_buf)(MCTPI2CEndpoint *mctp, const uint8_t **buf,
+ size_t maxlen, uint8_t *mctp_flags);
+
+ /**
+ * handle() - handle an MCTP message
+ *
+ * Called by the mctp subsystem when a full message has been delivered and
+ * may be parsed and processed.
+ */
+ void (*handle)(MCTPI2CEndpoint *mctp);
+
+ /**
+ * reset() - reset internal state
+ *
+ * Called by the mctp subsystem in the event of some transport error.
+ * Implementation must reset its internal state and drop any fragments
+ * previously receieved.
+ */
+ void (*reset)(MCTPI2CEndpoint *mctp);
+
+ /**
+ * get_types() - provide supported mctp message types
+ *
+ * Must provide a buffer with a full MCTP supported message types payload
+ * (i.e. `0x0(SUCCESS),0x1(COUNT),0x4(NMI)`).
+ *
+ * Returns the size of the response.
+ */
+ size_t (*get_types)(MCTPI2CEndpoint *mctp, const uint8_t **data);
+};
+
+/*
+ * Maximum value of the SMBus Block Write "Byte Count" field (8 bits).
+ *
+ * This is the count of bytes that follow the Byte Count field and up to, but
+ * not including, the PEC byte.
+ */
+#define I2C_MCTP_MAXBLOCK 255
+
+/*
+ * Maximum Transmission Unit under I2C.
+ *
+ * This is for the MCTP Packet Payload (255, subtracting the 4 byte MCTP Packet
+ * Header or the 1 byte MCTP/I2C piggy-backed source address).
+ */
+#define I2C_MCTP_MAXMTU (I2C_MCTP_MAXBLOCK - (sizeof(MCTPPacketHeader) + 1))
+
+/*
+ * Maximum length of an MCTP/I2C packet.
+ *
+ * This is the sum of the three I2C header bytes (Destination target address,
+ * Command Code and Byte Count), the maximum number of bytes in a message (255)
+ * and the 1 byte Packet Error Code.
+ */
+#define I2C_MCTP_MAX_LENGTH (3 + I2C_MCTP_MAXBLOCK + 1)
+
+typedef enum {
+ I2C_MCTP_STATE_IDLE,
+ I2C_MCTP_STATE_RX_STARTED,
+ I2C_MCTP_STATE_RX,
+ I2C_MCTP_STATE_WAIT_TX,
+ I2C_MCTP_STATE_TX,
+} MCTPState;
+
+typedef enum {
+ I2C_MCTP_STATE_TX_START_SEND,
+ I2C_MCTP_STATE_TX_SEND_BYTE,
+} MCTPTxState;
+
+typedef struct MCTPI2CEndpoint {
+ I2CSlave parent_obj;
+ I2CBus *i2c;
+
+ MCTPState state;
+
+ /* mctp endpoint identifier */
+ uint8_t my_eid;
+
+ uint8_t buffer[I2C_MCTP_MAX_LENGTH];
+ uint64_t pos;
+ size_t len;
+
+ struct {
+ MCTPTxState state;
+ bool is_control;
+
+ uint8_t eid;
+ uint8_t addr;
+ uint8_t pktseq;
+ uint8_t tag;
+
+ QEMUBH *bh;
+ } tx;
+} MCTPI2CEndpoint;
+
+void i2c_mctp_schedule_send(MCTPI2CEndpoint *mctp);
+
+#endif /* QEMU_I2C_MCTP_H */
diff --git a/include/net/mctp.h b/include/net/mctp.h
new file mode 100644
index 000000000000..5d26d855dba0
--- /dev/null
+++ b/include/net/mctp.h
@@ -0,0 +1,35 @@
+#ifndef QEMU_MCTP_H
+#define QEMU_MCTP_H
+
+#include "hw/registerfields.h"
+
+/* DSP0236 1.3.0, Section 8.3.1 */
+#define MCTP_BASELINE_MTU 64
+
+/* DSP0236 1.3.0, Table 1, Message body */
+FIELD(MCTP_MESSAGE_H, TYPE, 0, 7)
+FIELD(MCTP_MESSAGE_H, IC, 7, 1)
+
+/* DSP0236 1.3.0, Table 1, MCTP transport header */
+FIELD(MCTP_H_FLAGS, TAG, 0, 3);
+FIELD(MCTP_H_FLAGS, TO, 3, 1);
+FIELD(MCTP_H_FLAGS, PKTSEQ, 4, 2);
+FIELD(MCTP_H_FLAGS, EOM, 6, 1);
+FIELD(MCTP_H_FLAGS, SOM, 7, 1);
+
+/* DSP0236 1.3.0, Figure 4 */
+typedef struct MCTPPacketHeader {
+ uint8_t version;
+ struct {
+ uint8_t dest;
+ uint8_t source;
+ } eid;
+ uint8_t flags;
+} MCTPPacketHeader;
+
+typedef struct MCTPPacket {
+ MCTPPacketHeader hdr;
+ uint8_t payload[];
+} MCTPPacket;
+
+#endif /* QEMU_MCTP_H */
--
2.42.0
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH v4 3/3] hw/nvme: add nvme management interface model
2023-08-23 9:21 [PATCH v4 0/3] hw/{i2c,nvme}: mctp endpoint, nvme management interface model Klaus Jensen
2023-08-23 9:21 ` [PATCH v4 1/3] hw/i2c: add smbus pec utility function Klaus Jensen
2023-08-23 9:21 ` [PATCH v4 2/3] hw/i2c: add mctp core Klaus Jensen
@ 2023-08-23 9:22 ` Klaus Jensen
2023-08-30 14:47 ` Jonathan Cameron via
2 siblings, 1 reply; 8+ messages in thread
From: Klaus Jensen @ 2023-08-23 9:22 UTC (permalink / raw)
To: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch
Cc: Lior Weintraub, Jeremy Kerr, Matt Johnston, Peter Delevoryas,
Jonathan Cameron, Klaus Jensen, qemu-devel, qemu-arm, qemu-block,
Klaus Jensen
From: Klaus Jensen <k.jensen@samsung.com>
Add the 'nmi-i2c' device that emulates an NVMe Management Interface
controller.
Initial support is very basic (Read NMI DS, Configuration Get).
This is based on previously posted code by Padmakar Kalghatgi, Arun
Kumar Agasar and Saurav Kumar.
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
hw/nvme/Kconfig | 4 +
hw/nvme/meson.build | 1 +
hw/nvme/nmi-i2c.c | 418 +++++++++++++++++++++++++++++++++++++++++++++++++++
hw/nvme/trace-events | 6 +
4 files changed, 429 insertions(+)
diff --git a/hw/nvme/Kconfig b/hw/nvme/Kconfig
index 8ac90942e55e..1d89a4f4ecea 100644
--- a/hw/nvme/Kconfig
+++ b/hw/nvme/Kconfig
@@ -2,3 +2,7 @@ config NVME_PCI
bool
default y if PCI_DEVICES
depends on PCI
+
+config NVME_NMI_I2C
+ bool
+ default y if I2C_MCTP
diff --git a/hw/nvme/meson.build b/hw/nvme/meson.build
index 1a6a2ca2f307..7bc85f31c149 100644
--- a/hw/nvme/meson.build
+++ b/hw/nvme/meson.build
@@ -1 +1,2 @@
system_ss.add(when: 'CONFIG_NVME_PCI', if_true: files('ctrl.c', 'dif.c', 'ns.c', 'subsys.c'))
+system_ss.add(when: 'CONFIG_NVME_NMI_I2C', if_true: files('nmi-i2c.c'))
diff --git a/hw/nvme/nmi-i2c.c b/hw/nvme/nmi-i2c.c
new file mode 100644
index 000000000000..9040ba28a87c
--- /dev/null
+++ b/hw/nvme/nmi-i2c.c
@@ -0,0 +1,418 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2023 Samsung Electronics Co., Ltd.
+ *
+ * SPDX-FileContributor: Padmakar Kalghatgi <p.kalghatgi@samsung.com>
+ * SPDX-FileContributor: Arun Kumar Agasar <arun.kka@samsung.com>
+ * SPDX-FileContributor: Saurav Kumar <saurav.29@partner.samsung.com>
+ * SPDX-FileContributor: Klaus Jensen <k.jensen@samsung.com>
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/crc32c.h"
+#include "hw/registerfields.h"
+#include "hw/i2c/i2c.h"
+#include "hw/i2c/mctp.h"
+#include "net/mctp.h"
+#include "trace.h"
+
+#define NMI_MAX_MESSAGE_LENGTH 4224
+
+#define TYPE_NMI_I2C_DEVICE "nmi-i2c"
+OBJECT_DECLARE_SIMPLE_TYPE(NMIDevice, NMI_I2C_DEVICE)
+
+typedef struct NMIDevice {
+ MCTPI2CEndpoint mctp;
+
+ uint8_t buffer[NMI_MAX_MESSAGE_LENGTH];
+ uint8_t scratch[NMI_MAX_MESSAGE_LENGTH];
+
+ size_t len;
+ int64_t pos;
+} NMIDevice;
+
+FIELD(NMI_MCTPD, MT, 0, 7)
+FIELD(NMI_MCTPD, IC, 7, 1)
+
+#define NMI_MCTPD_MT_NMI 0x4
+#define NMI_MCTPD_IC_ENABLED 0x1
+
+FIELD(NMI_NMP, ROR, 7, 1)
+FIELD(NMI_NMP, NMIMT, 3, 4)
+
+#define NMI_NMP_NMIMT_NVME_MI 0x1
+#define NMI_NMP_NMIMT_NVME_ADMIN 0x2
+
+typedef struct NMIMessage {
+ uint8_t mctpd;
+ uint8_t nmp;
+ uint8_t rsvd2[2];
+ uint8_t payload[]; /* includes the Message Integrity Check */
+} NMIMessage;
+
+typedef struct NMIRequest {
+ uint8_t opc;
+ uint8_t rsvd1[3];
+ uint32_t dw0;
+ uint32_t dw1;
+ uint32_t mic;
+} NMIRequest;
+
+typedef enum NMIReadDSType {
+ NMI_CMD_READ_NMI_DS_SUBSYSTEM = 0x0,
+ NMI_CMD_READ_NMI_DS_PORTS = 0x1,
+ NMI_CMD_READ_NMI_DS_CTRL_LIST = 0x2,
+ NMI_CMD_READ_NMI_DS_CTRL_INFO = 0x3,
+ NMI_CMD_READ_NMI_DS_OPT_CMD_SUPPORT = 0x4,
+ NMI_CMD_READ_NMI_DS_MEB_CMD_SUPPORT = 0x5,
+} NMIReadDSType;
+
+#define NMI_STATUS_INVALID_PARAMETER 0x4
+
+static void nmi_set_parameter_error(NMIDevice *nmi, uint8_t bit, uint16_t byte)
+{
+ /* NVM Express Management Interface 1.2c, Figure 30 */
+ struct resp {
+ uint8_t status;
+ uint8_t bit;
+ uint16_t byte;
+ };
+
+ struct resp *buf = (struct resp *)(nmi->scratch + nmi->pos);
+
+ buf->status = NMI_STATUS_INVALID_PARAMETER;
+ buf->bit = bit & 0x3;
+ buf->byte = byte;
+
+ nmi->pos += sizeof(struct resp);
+}
+
+static void nmi_set_error(NMIDevice *nmi, uint8_t status)
+{
+ uint8_t buf[4] = {};
+
+ buf[0] = status;
+
+ memcpy(nmi->scratch + nmi->pos, buf, 4);
+ nmi->pos += 4;
+}
+
+static void nmi_handle_mi_read_nmi_ds(NMIDevice *nmi, NMIRequest *request)
+{
+ I2CSlave *i2c = I2C_SLAVE(nmi);
+
+ uint32_t dw0 = le32_to_cpu(request->dw0);
+ uint8_t dtyp = (dw0 >> 24) & 0xf;
+ uint8_t *buf;
+ size_t len;
+
+ trace_nmi_handle_mi_read_nmi_ds(dtyp);
+
+ static uint8_t nmi_ds_subsystem[36] = {
+ 0x00, /* success */
+ 0x20, 0x00, /* response data length */
+ 0x00, /* reserved */
+ 0x00, /* number of ports */
+ 0x01, /* major version */
+ 0x01, /* minor version */
+ };
+
+ /* cannot be static since we need to patch in the i2c address */
+ uint8_t nmi_ds_ports[36] = {
+ 0x00, /* success */
+ 0x20, 0x00, /* response data length */
+ 0x00, /* reserved */
+ 0x02, /* port type (smbus) */
+ 0x00, /* reserved */
+ 0x40, 0x00, /* maximum mctp transission unit size (64 bytes) */
+ 0x00, 0x00, 0x00, 0x00, /* management endpoint buffer size */
+ 0x00, /* vpd i2c address */
+ 0x00, /* vpd i2c frequency */
+ 0x00, /* management endpoint i2c address */
+ 0x01, /* management endpoint i2c frequency */
+ 0x00, /* nvme basic management command NOT supported */
+ };
+
+ /**
+ * Controller Information is zeroed, since there are no associated
+ * controllers at this point.
+ */
+ static uint8_t nmi_ds_ctrl[36] = {};
+
+ /**
+ * For the Controller List, Optionally Supported Command List and
+ * Management Endpoint Buffer Supported Command List data structures.
+ *
+ * The Controller List data structure is defined in the NVM Express Base
+ * Specification, revision 2.0b, Figure 134.
+ */
+ static uint8_t nmi_ds_empty[6] = {
+ 0x00, /* success */
+ 0x02, /* response data length */
+ 0x00, 0x00, /* reserved */
+ 0x00, 0x00, /* number of entries (zero) */
+ };
+
+ switch (dtyp) {
+ case NMI_CMD_READ_NMI_DS_SUBSYSTEM:
+ len = sizeof(nmi_ds_subsystem);
+ buf = nmi_ds_subsystem;
+
+ break;
+
+ case NMI_CMD_READ_NMI_DS_PORTS:
+ len = sizeof(nmi_ds_ports);
+ buf = nmi_ds_ports;
+
+ /* patch in the i2c address of the endpoint */
+ buf[14] = i2c->address;
+
+ break;
+
+ case NMI_CMD_READ_NMI_DS_CTRL_INFO:
+ len = sizeof(nmi_ds_ctrl);
+ buf = nmi_ds_ctrl;
+
+ break;
+
+ case NMI_CMD_READ_NMI_DS_CTRL_LIST:
+ case NMI_CMD_READ_NMI_DS_OPT_CMD_SUPPORT:
+ case NMI_CMD_READ_NMI_DS_MEB_CMD_SUPPORT:
+ len = sizeof(nmi_ds_empty);
+ buf = nmi_ds_empty;
+
+ break;
+
+ default:
+ nmi_set_parameter_error(nmi, offsetof(NMIRequest, dw0) + 4, 0);
+
+ return;
+ }
+
+ memcpy(nmi->scratch + nmi->pos, buf, len);
+ nmi->pos += len;
+}
+
+enum {
+ NMI_CMD_CONFIGURATION_GET_SMBUS_FREQ = 0x1,
+ NMI_CMD_CONFIGURATION_GET_HEALTH_STATUS_CHANGE = 0x2,
+ NMI_CMD_CONFIGURATION_GET_MCTP_TRANSMISSION_UNIT = 0x3,
+};
+
+static void nmi_handle_mi_config_get(NMIDevice *nmi, NMIRequest *request)
+{
+ uint32_t dw0 = le32_to_cpu(request->dw0);
+ uint8_t identifier = dw0 & 0xff;
+ uint8_t *buf;
+
+ static uint8_t smbus_freq[4] = {
+ 0x00, /* success */
+ 0x01, 0x00, 0x00, /* 100 kHz */
+ };
+
+ static uint8_t mtu[4] = {
+ 0x00, /* success */
+ 0x40, 0x00, /* 64 */
+ 0x00, /* reserved */
+ };
+
+ trace_nmi_handle_mi_config_get(identifier);
+
+ switch (identifier) {
+ case NMI_CMD_CONFIGURATION_GET_SMBUS_FREQ:
+ buf = smbus_freq;
+ break;
+
+ case NMI_CMD_CONFIGURATION_GET_MCTP_TRANSMISSION_UNIT:
+ buf = mtu;
+ break;
+
+ default:
+ nmi_set_parameter_error(nmi, 0x0, offsetof(NMIRequest, dw0));
+ return;
+ }
+
+ memcpy(nmi->scratch + nmi->pos, buf, 4);
+ nmi->pos += 4;
+}
+
+enum {
+ NMI_CMD_READ_NMI_DS = 0x0,
+ NMI_CMD_CONFIGURATION_GET = 0x4,
+};
+
+static void nmi_handle_mi(NMIDevice *nmi, NMIMessage *msg)
+{
+ NMIRequest *request = (NMIRequest *)msg->payload;
+
+ trace_nmi_handle_mi(request->opc);
+
+ switch (request->opc) {
+ case NMI_CMD_READ_NMI_DS:
+ nmi_handle_mi_read_nmi_ds(nmi, request);
+ break;
+
+ case NMI_CMD_CONFIGURATION_GET:
+ nmi_handle_mi_config_get(nmi, request);
+ break;
+
+ default:
+ nmi_set_parameter_error(nmi, 0x0, 0x0);
+ fprintf(stderr, "nmi command 0x%x not handled\n", request->opc);
+
+ break;
+ }
+}
+
+static void nmi_reset(MCTPI2CEndpoint *mctp)
+{
+ NMIDevice *nmi = NMI_I2C_DEVICE(mctp);
+ nmi->len = 0;
+}
+
+static void nmi_handle(MCTPI2CEndpoint *mctp)
+{
+ NMIDevice *nmi = NMI_I2C_DEVICE(mctp);
+ NMIMessage *msg = (NMIMessage *)nmi->buffer;
+ uint32_t crc;
+ uint8_t nmimt;
+
+ uint8_t buf[] = {
+ msg->mctpd,
+ FIELD_DP8(msg->nmp, NMI_NMP, ROR, 1),
+ 0x0, 0x0,
+ };
+
+ if (FIELD_EX8(msg->mctpd, NMI_MCTPD, MT) != NMI_MCTPD_MT_NMI) {
+ goto drop;
+ }
+
+ if (FIELD_EX8(msg->mctpd, NMI_MCTPD, IC) != NMI_MCTPD_IC_ENABLED) {
+ goto drop;
+ }
+
+ memcpy(nmi->scratch, buf, sizeof(buf));
+ nmi->pos = sizeof(buf);
+
+ nmimt = FIELD_EX8(msg->nmp, NMI_NMP, NMIMT);
+
+ trace_nmi_handle_msg(nmimt);
+
+ switch (nmimt) {
+ case NMI_NMP_NMIMT_NVME_MI:
+ nmi_handle_mi(nmi, msg);
+ break;
+
+ default:
+ fprintf(stderr, "nmi message type 0x%x not handled\n", nmimt);
+
+ nmi_set_error(nmi, 0x3);
+
+ break;
+ }
+
+ /* add message integrity check */
+ memset(nmi->scratch + nmi->pos, 0x0, sizeof(crc));
+
+ crc = crc32c(0xffffffff, nmi->scratch, nmi->pos);
+ memcpy(nmi->scratch + nmi->pos, &crc, sizeof(crc));
+
+ nmi->len = nmi->pos + sizeof(crc);
+ nmi->pos = 0;
+
+ i2c_mctp_schedule_send(mctp);
+
+ return;
+
+drop:
+ nmi_reset(mctp);
+}
+
+static size_t nmi_get_buf(MCTPI2CEndpoint *mctp, const uint8_t **buf,
+ size_t maxlen, uint8_t *mctp_flags)
+{
+ NMIDevice *nmi = NMI_I2C_DEVICE(mctp);
+ size_t len;
+
+ len = MIN(maxlen, nmi->len - nmi->pos);
+
+ if (len == 0) {
+ return 0;
+ }
+
+ if (nmi->pos == 0) {
+ *mctp_flags = FIELD_DP8(*mctp_flags, MCTP_H_FLAGS, SOM, 1);
+ }
+
+ *buf = nmi->scratch + nmi->pos;
+ nmi->pos += len;
+
+ if (nmi->pos == nmi->len) {
+ *mctp_flags = FIELD_DP8(*mctp_flags, MCTP_H_FLAGS, EOM, 1);
+
+ nmi->pos = nmi->len = 0;
+ }
+
+ return len;
+}
+
+static int nmi_put_buf(MCTPI2CEndpoint *mctp, uint8_t *buf, size_t len)
+{
+ NMIDevice *nmi = NMI_I2C_DEVICE(mctp);
+
+ if (nmi->len + len > NMI_MAX_MESSAGE_LENGTH) {
+ return -1;
+ }
+
+ memcpy(nmi->buffer + nmi->len, buf, len);
+ nmi->len += len;
+
+ return 0;
+}
+
+static size_t nmi_get_types(MCTPI2CEndpoint *mctp, const uint8_t **data)
+{
+ /**
+ * DSP0236 1.3.0, Table 19.
+ *
+ * This only includes message types that are supported *in addition* to the
+ * MCTP control message type.
+ */
+ static const uint8_t buf[] = {
+ 0x0, /* success */
+ 0x1, /* number of message types in list (supported) */
+ NMI_MCTPD_MT_NMI,
+ };
+
+ *data = buf;
+
+ return sizeof(buf);
+}
+
+static void nvme_mi_class_init(ObjectClass *oc, void *data)
+{
+ MCTPI2CEndpointClass *mc = MCTP_I2C_ENDPOINT_CLASS(oc);
+
+ mc->get_types = nmi_get_types;
+
+ mc->get_buf = nmi_get_buf;
+ mc->put_buf = nmi_put_buf;
+
+ mc->handle = nmi_handle;
+ mc->reset = nmi_reset;
+}
+
+static const TypeInfo nvme_mi = {
+ .name = TYPE_NMI_I2C_DEVICE,
+ .parent = TYPE_MCTP_I2C_ENDPOINT,
+ .instance_size = sizeof(NMIDevice),
+ .class_init = nvme_mi_class_init,
+};
+
+static void register_types(void)
+{
+ type_register_static(&nvme_mi);
+}
+
+type_init(register_types);
diff --git a/hw/nvme/trace-events b/hw/nvme/trace-events
index 3a67680c6ad1..41e2c540dcf2 100644
--- a/hw/nvme/trace-events
+++ b/hw/nvme/trace-events
@@ -216,3 +216,9 @@ pci_nvme_ub_db_wr_invalid_sq(uint32_t qid) "submission queue doorbell write for
pci_nvme_ub_db_wr_invalid_sqtail(uint32_t qid, uint16_t new_tail) "submission queue doorbell write value beyond queue size, sqid=%"PRIu32", new_head=%"PRIu16", ignoring"
pci_nvme_ub_unknown_css_value(void) "unknown value in cc.css field"
pci_nvme_ub_too_many_mappings(void) "too many prp/sgl mappings"
+
+# nmi-i2c
+nmi_handle_mi_read_nmi_ds(uint8_t dtyp) "dtyp 0x%"PRIx8""
+nmi_handle_mi_config_get(uint8_t identifier) "identifier 0x%"PRIx8""
+nmi_handle_mi(uint8_t opc) "opc 0x%"PRIx8""
+nmi_handle_msg(uint8_t nmint) "nmint 0x%"PRIx8""
--
2.42.0
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v4 1/3] hw/i2c: add smbus pec utility function
2023-08-23 9:21 ` [PATCH v4 1/3] hw/i2c: add smbus pec utility function Klaus Jensen
@ 2023-08-30 13:04 ` Jonathan Cameron via
0 siblings, 0 replies; 8+ messages in thread
From: Jonathan Cameron via @ 2023-08-30 13:04 UTC (permalink / raw)
To: Klaus Jensen
Cc: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch, Lior Weintraub, Jeremy Kerr, Matt Johnston,
Peter Delevoryas, qemu-devel, qemu-arm, qemu-block, Klaus Jensen
On Wed, 23 Aug 2023 11:21:58 +0200
Klaus Jensen <its@irrelevant.dk> wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
>
> Add i2c_smbus_pec() to calculate the SMBus Packet Error Code for a
> message.
>
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
> hw/i2c/smbus_master.c | 26 ++++++++++++++++++++++++++
> include/hw/i2c/smbus_master.h | 2 ++
> 2 files changed, 28 insertions(+)
>
> diff --git a/hw/i2c/smbus_master.c b/hw/i2c/smbus_master.c
> index 6a53c34e70b7..01a8e4700222 100644
> --- a/hw/i2c/smbus_master.c
> +++ b/hw/i2c/smbus_master.c
> @@ -15,6 +15,32 @@
> #include "hw/i2c/i2c.h"
> #include "hw/i2c/smbus_master.h"
>
> +static uint8_t crc8(uint16_t data)
> +{
> + int i;
> +
> + for (i = 0; i < 8; i++) {
> + if (data & 0x8000) {
> + data ^= 0x1070U << 3;
> + }
> +
> + data <<= 1;
> + }
> +
> + return (uint8_t)(data >> 8);
> +}
> +
> +uint8_t i2c_smbus_pec(uint8_t crc, uint8_t *buf, size_t len)
> +{
> + int i;
> +
> + for (i = 0; i < len; i++) {
> + crc = crc8((crc ^ buf[i]) << 8);
> + }
> +
> + return crc;
> +}
> +
> /* Master device commands. */
> int smbus_quick_command(I2CBus *bus, uint8_t addr, int read)
> {
> diff --git a/include/hw/i2c/smbus_master.h b/include/hw/i2c/smbus_master.h
> index bb13bc423c22..d90f81767d86 100644
> --- a/include/hw/i2c/smbus_master.h
> +++ b/include/hw/i2c/smbus_master.h
> @@ -27,6 +27,8 @@
>
> #include "hw/i2c/i2c.h"
>
> +uint8_t i2c_smbus_pec(uint8_t crc, uint8_t *buf, size_t len);
> +
> /* Master device commands. */
> int smbus_quick_command(I2CBus *bus, uint8_t addr, int read);
> int smbus_receive_byte(I2CBus *bus, uint8_t addr);
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v4 2/3] hw/i2c: add mctp core
2023-08-23 9:21 ` [PATCH v4 2/3] hw/i2c: add mctp core Klaus Jensen
@ 2023-08-30 14:31 ` Jonathan Cameron via
2023-09-04 10:49 ` Klaus Jensen
0 siblings, 1 reply; 8+ messages in thread
From: Jonathan Cameron via @ 2023-08-30 14:31 UTC (permalink / raw)
To: Klaus Jensen
Cc: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch, Lior Weintraub, Jeremy Kerr, Matt Johnston,
Peter Delevoryas, qemu-devel, qemu-arm, qemu-block, Klaus Jensen
On Wed, 23 Aug 2023 11:21:59 +0200
Klaus Jensen <its@irrelevant.dk> wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
>
> Add an abstract MCTP over I2C endpoint model. This implements MCTP
> control message handling as well as handling the actual I2C transport
> (packetization).
>
> Devices are intended to derive from this and implement the class
> methods.
>
> Parts of this implementation is inspired by code[1] previously posted by
> Jonathan Cameron.
>
> Squashed a fix[2] from Matt Johnston.
>
> [1]: https://lore.kernel.org/qemu-devel/20220520170128.4436-1-Jonathan.Cameron@huawei.com/
> [2]: https://lore.kernel.org/qemu-devel/20221121080445.GA29062@codeconstruct.com.au/
>
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
I made the minor changes to the CXL FM-API PoC to use this and all works as expected so
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Some minor things inline. With those tidied up or ignored with clear reasoning.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> diff --git a/hw/i2c/mctp.c b/hw/i2c/mctp.c
> new file mode 100644
> index 000000000000..217073d62435
> --- /dev/null
> +++ b/hw/i2c/mctp.c
...
> +static int i2c_mctp_event_cb(I2CSlave *i2c, enum i2c_event event)
> +{
> + MCTPI2CEndpoint *mctp = MCTP_I2C_ENDPOINT(i2c);
> + MCTPI2CEndpointClass *mc = MCTP_I2C_ENDPOINT_GET_CLASS(mctp);
> + MCTPI2CPacket *pkt = (MCTPI2CPacket *)mctp->buffer;
> + size_t payload_len;
> + uint8_t pec, pktseq, msgtype;
> +
> + switch (event) {
> + case I2C_START_SEND:
> + if (mctp->state == I2C_MCTP_STATE_IDLE) {
> + mctp->state = I2C_MCTP_STATE_RX_STARTED;
> + } else if (mctp->state != I2C_MCTP_STATE_RX) {
> + return -1;
> + }
> +
> + /* the i2c core eats the slave address, so put it back in */
> + pkt->i2c.dest = i2c->address << 1;
> + mctp->len = 1;
> +
> + return 0;
> +
> + case I2C_FINISH:
> + if (mctp->len < sizeof(MCTPI2CPacket) + 1) {
> + trace_i2c_mctp_drop_short_packet(mctp->len);
> + goto drop;
> + }
> +
> + payload_len = mctp->len - (1 + offsetof(MCTPI2CPacket, mctp.payload));
> +
> + if (pkt->i2c.byte_count + 3 != mctp->len - 1) {
> + trace_i2c_mctp_drop_invalid_length(pkt->i2c.byte_count + 3,
> + mctp->len - 1);
> + goto drop;
> + }
> +
> + pec = i2c_smbus_pec(0, mctp->buffer, mctp->len - 1);
> + if (mctp->buffer[mctp->len - 1] != pec) {
> + trace_i2c_mctp_drop_invalid_pec(mctp->buffer[mctp->len - 1], pec);
> + goto drop;
> + }
> +
> + if (!(pkt->mctp.hdr.eid.dest == mctp->my_eid ||
> + pkt->mctp.hdr.eid.dest == 0)) {
> + trace_i2c_mctp_drop_invalid_eid(pkt->mctp.hdr.eid.dest,
> + mctp->my_eid);
> + goto drop;
> + }
> +
> + pktseq = FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, PKTSEQ);
> +
> + if (FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, SOM)) {
> + mctp->tx.is_control = false;
> +
> + if (mctp->state == I2C_MCTP_STATE_RX) {
> + mc->reset(mctp);
> + }
> +
> + mctp->state = I2C_MCTP_STATE_RX;
> +
> + mctp->tx.addr = pkt->i2c.source >> 1;
> + mctp->tx.eid = pkt->mctp.hdr.eid.source;
> + mctp->tx.tag = FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, TAG);
> + mctp->tx.pktseq = pktseq;
> +
> + msgtype = FIELD_EX8(pkt->mctp.payload[0], MCTP_MESSAGE_H, TYPE);
> +
> + if (msgtype == MCTP_MESSAGE_TYPE_CONTROL) {
> + mctp->tx.is_control = true;
> +
> + i2c_mctp_handle_control(mctp);
> +
> + return 0;
> + }
> + } else if (mctp->state == I2C_MCTP_STATE_RX_STARTED) {
> + trace_i2c_mctp_drop_expected_som();
> + goto drop;
> + } else if (pktseq != (++mctp->tx.pktseq & 0x3)) {
> + trace_i2c_mctp_drop_invalid_pktseq(pktseq, mctp->tx.pktseq & 0x3);
> + goto drop;
> + }
> +
> + mc->put_buf(mctp, i2c_mctp_payload(mctp->buffer), payload_len);
Given this returns -1 on error should probably handle errors.
> +
> + if (FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, EOM)) {
> + mc->handle(mctp);
> + mctp->state = I2C_MCTP_STATE_WAIT_TX;
> + }
> +
> + return 0;
> +
> + default:
> + return -1;
> + }
> +
> +drop:
> + mc->reset(mctp);
> +
> + mctp->state = I2C_MCTP_STATE_IDLE;
> +
> + return 0;
> +}
...
> diff --git a/include/hw/i2c/mctp.h b/include/hw/i2c/mctp.h
> new file mode 100644
> index 000000000000..fccbf249cdbe
> --- /dev/null
> +++ b/include/hw/i2c/mctp.h
> @@ -0,0 +1,127 @@
> +#ifndef QEMU_I2C_MCTP_H
> +#define QEMU_I2C_MCTP_H
> +
> +#include "qom/object.h"
> +#include "hw/qdev-core.h"
> +
> +#define TYPE_MCTP_I2C_ENDPOINT "mctp-i2c-endpoint"
> +OBJECT_DECLARE_TYPE(MCTPI2CEndpoint, MCTPI2CEndpointClass, MCTP_I2C_ENDPOINT)
> +
> +struct MCTPI2CEndpointClass {
> + I2CSlaveClass parent_class;
> +
> + /**
> + *
Drop the blank line for consistency with the other comments.
> + * put_buf() - receive incoming message fragment
> + *
> + * Must returns 0 for succes or -1 for error.
I would expect any negative to count as error rather than just -1.
Also, simple imperative should be clear enough
* Return 0 for success or negative for error.
> + */
> + int (*put_buf)(MCTPI2CEndpoint *mctp, uint8_t *buf, size_t len);
> +
> + /**
> + * get_buf() - provide pointer to message fragment
> + *
> + * Called by the mctp subsystem to request a pointer to the next message
> + * fragment. The implementation must advance its internal position such
> + * that successive calls returns the next fragments.
Subsequent call with return next fragment.
Up to the implementation to decide how it does this.
> + *
> + * Must return the number of bytes available.
Return number of bytes in message fragment.
Available might mean in all fragments.
> + */
> + size_t (*get_buf)(MCTPI2CEndpoint *mctp, const uint8_t **buf,
> + size_t maxlen, uint8_t *mctp_flags);
> +
> + /**
> + * handle() - handle an MCTP message
> + *
> + * Called by the mctp subsystem when a full message has been delivered and
> + * may be parsed and processed.
> + */
> + void (*handle)(MCTPI2CEndpoint *mctp);
> +
> + /**
> + * reset() - reset internal state
> + *
> + * Called by the mctp subsystem in the event of some transport error.
> + * Implementation must reset its internal state and drop any fragments
> + * previously receieved.
> + */
> + void (*reset)(MCTPI2CEndpoint *mctp);
> +
> + /**
> + * get_types() - provide supported mctp message types
> + *
> + * Must provide a buffer with a full MCTP supported message types payload
> + * (i.e. `0x0(SUCCESS),0x1(COUNT),0x4(NMI)`).
> + *
> + * Returns the size of the response.
> + */
> + size_t (*get_types)(MCTPI2CEndpoint *mctp, const uint8_t **data);
> +};
> +
> +/*
> + * Maximum value of the SMBus Block Write "Byte Count" field (8 bits).
> + *
> + * This is the count of bytes that follow the Byte Count field and up to, but
> + * not including, the PEC byte.
> + */
> +#define I2C_MCTP_MAXBLOCK 255
> +
> +/*
> + * Maximum Transmission Unit under I2C.
> + *
> + * This is for the MCTP Packet Payload (255, subtracting the 4 byte MCTP Packet
> + * Header or the 1 byte MCTP/I2C piggy-backed source address).
and the 1 byte.. ?
> + */
> +#define I2C_MCTP_MAXMTU (I2C_MCTP_MAXBLOCK - (sizeof(MCTPPacketHeader) + 1))
> +
> +/*
> + * Maximum length of an MCTP/I2C packet.
> + *
> + * This is the sum of the three I2C header bytes (Destination target address,
> + * Command Code and Byte Count), the maximum number of bytes in a message (255)
> + * and the 1 byte Packet Error Code.
> + */
> +#define I2C_MCTP_MAX_LENGTH (3 + I2C_MCTP_MAXBLOCK + 1)
> +
> +typedef enum {
> + I2C_MCTP_STATE_IDLE,
> + I2C_MCTP_STATE_RX_STARTED,
> + I2C_MCTP_STATE_RX,
> + I2C_MCTP_STATE_WAIT_TX,
> + I2C_MCTP_STATE_TX,
> +} MCTPState;
> +
> +typedef enum {
> + I2C_MCTP_STATE_TX_START_SEND,
> + I2C_MCTP_STATE_TX_SEND_BYTE,
> +} MCTPTxState;
> +
> +typedef struct MCTPI2CEndpoint {
> + I2CSlave parent_obj;
> + I2CBus *i2c;
> +
> + MCTPState state;
> +
> + /* mctp endpoint identifier */
> + uint8_t my_eid;
> +
> + uint8_t buffer[I2C_MCTP_MAX_LENGTH];
> + uint64_t pos;
> + size_t len;
> +
> + struct {
> + MCTPTxState state;
> + bool is_control;
> +
> + uint8_t eid;
> + uint8_t addr;
> + uint8_t pktseq;
> + uint8_t tag;
> +
> + QEMUBH *bh;
> + } tx;
> +} MCTPI2CEndpoint;
> +
> +void i2c_mctp_schedule_send(MCTPI2CEndpoint *mctp);
> +
> +#endif /* QEMU_I2C_MCTP_H */
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v4 3/3] hw/nvme: add nvme management interface model
2023-08-23 9:22 ` [PATCH v4 3/3] hw/nvme: add nvme management interface model Klaus Jensen
@ 2023-08-30 14:47 ` Jonathan Cameron via
0 siblings, 0 replies; 8+ messages in thread
From: Jonathan Cameron via @ 2023-08-30 14:47 UTC (permalink / raw)
To: Klaus Jensen
Cc: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch, Lior Weintraub, Jeremy Kerr, Matt Johnston,
Peter Delevoryas, qemu-devel, qemu-arm, qemu-block, Klaus Jensen
On Wed, 23 Aug 2023 11:22:00 +0200
Klaus Jensen <its@irrelevant.dk> wrote:
> From: Klaus Jensen <k.jensen@samsung.com>
>
> Add the 'nmi-i2c' device that emulates an NVMe Management Interface
> controller.
>
> Initial support is very basic (Read NMI DS, Configuration Get).
>
> This is based on previously posted code by Padmakar Kalghatgi, Arun
> Kumar Agasar and Saurav Kumar.
>
> Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
Hi Klaus
Minor suggestions inline. Either way given how trivial they are
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> diff --git a/hw/nvme/nmi-i2c.c b/hw/nvme/nmi-i2c.c
> new file mode 100644
> index 000000000000..9040ba28a87c
> --- /dev/null
> +++ b/hw/nvme/nmi-i2c.c
> @@ -0,0 +1,418 @@
...
> +#define NMI_MAX_MESSAGE_LENGTH 4224
Spec reference or similar would be good for this.
...
> +
> +static void nmi_set_error(NMIDevice *nmi, uint8_t status)
> +{
> + uint8_t buf[4] = {};
> +
> + buf[0] = status;
Could just do
uint8_t buf[4] = { status, };
> +
> + memcpy(nmi->scratch + nmi->pos, buf, 4);
> + nmi->pos += 4;
sizeof(buf)
> +}
> +
> +static void nmi_handle_mi_read_nmi_ds(NMIDevice *nmi, NMIRequest *request)
> +{
> + I2CSlave *i2c = I2C_SLAVE(nmi);
> +
> + uint32_t dw0 = le32_to_cpu(request->dw0);
> + uint8_t dtyp = (dw0 >> 24) & 0xf;
Maybe FIELD_EX32() with appropriate defines?
> + uint8_t *buf;
> + size_t len;
> +
> + trace_nmi_handle_mi_read_nmi_ds(dtyp);
> +
> + static uint8_t nmi_ds_subsystem[36] = {
> + 0x00, /* success */
> + 0x20, 0x00, /* response data length */
> + 0x00, /* reserved */
> + 0x00, /* number of ports */
> + 0x01, /* major version */
> + 0x01, /* minor version */
> + };
> +
> + /* cannot be static since we need to patch in the i2c address */
> + uint8_t nmi_ds_ports[36] = {
> + 0x00, /* success */
> + 0x20, 0x00, /* response data length */
> + 0x00, /* reserved */
> + 0x02, /* port type (smbus) */
> + 0x00, /* reserved */
> + 0x40, 0x00, /* maximum mctp transission unit size (64 bytes) */
> + 0x00, 0x00, 0x00, 0x00, /* management endpoint buffer size */
> + 0x00, /* vpd i2c address */
> + 0x00, /* vpd i2c frequency */
> + 0x00, /* management endpoint i2c address */
> + 0x01, /* management endpoint i2c frequency */
> + 0x00, /* nvme basic management command NOT supported */
> + };
> +
> + /**
> + * Controller Information is zeroed, since there are no associated
> + * controllers at this point.
> + */
> + static uint8_t nmi_ds_ctrl[36] = {};
> +
> + /**
> + * For the Controller List, Optionally Supported Command List and
> + * Management Endpoint Buffer Supported Command List data structures.
> + *
> + * The Controller List data structure is defined in the NVM Express Base
> + * Specification, revision 2.0b, Figure 134.
> + */
> + static uint8_t nmi_ds_empty[6] = {
> + 0x00, /* success */
> + 0x02, /* response data length */
> + 0x00, 0x00, /* reserved */
> + 0x00, 0x00, /* number of entries (zero) */
> + };
> +
> + switch (dtyp) {
> + case NMI_CMD_READ_NMI_DS_SUBSYSTEM:
> + len = sizeof(nmi_ds_subsystem);
> + buf = nmi_ds_subsystem;
> +
> + break;
> +
> + case NMI_CMD_READ_NMI_DS_PORTS:
> + len = sizeof(nmi_ds_ports);
> + buf = nmi_ds_ports;
> +
> + /* patch in the i2c address of the endpoint */
> + buf[14] = i2c->address;
> +
> + break;
> +
> + case NMI_CMD_READ_NMI_DS_CTRL_INFO:
> + len = sizeof(nmi_ds_ctrl);
> + buf = nmi_ds_ctrl;
> +
> + break;
> +
> + case NMI_CMD_READ_NMI_DS_CTRL_LIST:
> + case NMI_CMD_READ_NMI_DS_OPT_CMD_SUPPORT:
> + case NMI_CMD_READ_NMI_DS_MEB_CMD_SUPPORT:
> + len = sizeof(nmi_ds_empty);
> + buf = nmi_ds_empty;
> +
> + break;
> +
> + default:
> + nmi_set_parameter_error(nmi, offsetof(NMIRequest, dw0) + 4, 0);
> +
> + return;
> + }
> +
> + memcpy(nmi->scratch + nmi->pos, buf, len);
> + nmi->pos += len;
> +}
> +
> +static void nmi_handle_mi_config_get(NMIDevice *nmi, NMIRequest *request)
> +{
> + uint32_t dw0 = le32_to_cpu(request->dw0);
> + uint8_t identifier = dw0 & 0xff;
> + uint8_t *buf;
> +
> + static uint8_t smbus_freq[4] = {
> + 0x00, /* success */
> + 0x01, 0x00, 0x00, /* 100 kHz */
> + };
const for these? Same for other similar buffers.
> +
> + static uint8_t mtu[4] = {
> + 0x00, /* success */
> + 0x40, 0x00, /* 64 */
> + 0x00, /* reserved */
> + };
> +
> + trace_nmi_handle_mi_config_get(identifier);
> +
> + switch (identifier) {
> + case NMI_CMD_CONFIGURATION_GET_SMBUS_FREQ:
> + buf = smbus_freq;
> + break;
> +
> + case NMI_CMD_CONFIGURATION_GET_MCTP_TRANSMISSION_UNIT:
> + buf = mtu;
> + break;
> +
> + default:
> + nmi_set_parameter_error(nmi, 0x0, offsetof(NMIRequest, dw0));
> + return;
> + }
> +
> + memcpy(nmi->scratch + nmi->pos, buf, 4);
> + nmi->pos += 4;
> +}
> +
> +static void nmi_handle(MCTPI2CEndpoint *mctp)
> +{
> + NMIDevice *nmi = NMI_I2C_DEVICE(mctp);
> + NMIMessage *msg = (NMIMessage *)nmi->buffer;
> + uint32_t crc;
> + uint8_t nmimt;
> +
> + uint8_t buf[] = {
const?
> + msg->mctpd,
> + FIELD_DP8(msg->nmp, NMI_NMP, ROR, 1),
> + 0x0, 0x0,
> + };
> +
> + if (FIELD_EX8(msg->mctpd, NMI_MCTPD, MT) != NMI_MCTPD_MT_NMI) {
> + goto drop;
> + }
> +
> + if (FIELD_EX8(msg->mctpd, NMI_MCTPD, IC) != NMI_MCTPD_IC_ENABLED) {
> + goto drop;
> + }
> +
> + memcpy(nmi->scratch, buf, sizeof(buf));
Jonathan
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v4 2/3] hw/i2c: add mctp core
2023-08-30 14:31 ` Jonathan Cameron via
@ 2023-09-04 10:49 ` Klaus Jensen
0 siblings, 0 replies; 8+ messages in thread
From: Klaus Jensen @ 2023-09-04 10:49 UTC (permalink / raw)
To: Jonathan Cameron
Cc: Corey Minyard, Paolo Bonzini, Peter Maydell, Jason Wang,
Keith Busch, Lior Weintraub, Jeremy Kerr, Matt Johnston,
Peter Delevoryas, qemu-devel, qemu-arm, qemu-block, Klaus Jensen
[-- Attachment #1: Type: text/plain, Size: 7050 bytes --]
On Aug 30 15:31, Jonathan Cameron wrote:
> On Wed, 23 Aug 2023 11:21:59 +0200
> Klaus Jensen <its@irrelevant.dk> wrote:
>
> > From: Klaus Jensen <k.jensen@samsung.com>
> >
> > Add an abstract MCTP over I2C endpoint model. This implements MCTP
> > control message handling as well as handling the actual I2C transport
> > (packetization).
> >
> > Devices are intended to derive from this and implement the class
> > methods.
> >
> > Parts of this implementation is inspired by code[1] previously posted by
> > Jonathan Cameron.
> >
> > Squashed a fix[2] from Matt Johnston.
> >
> > [1]: https://lore.kernel.org/qemu-devel/20220520170128.4436-1-Jonathan.Cameron@huawei.com/
> > [2]: https://lore.kernel.org/qemu-devel/20221121080445.GA29062@codeconstruct.com.au/
> >
> > Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
>
> I made the minor changes to the CXL FM-API PoC to use this and all works as expected so
>
> Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>
>
> Some minor things inline. With those tidied up or ignored with clear reasoning.
>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>
>
> > diff --git a/hw/i2c/mctp.c b/hw/i2c/mctp.c
> > new file mode 100644
> > index 000000000000..217073d62435
> > --- /dev/null
> > +++ b/hw/i2c/mctp.c
>
>
> ...
>
>
> > +static int i2c_mctp_event_cb(I2CSlave *i2c, enum i2c_event event)
> > +{
> > + MCTPI2CEndpoint *mctp = MCTP_I2C_ENDPOINT(i2c);
> > + MCTPI2CEndpointClass *mc = MCTP_I2C_ENDPOINT_GET_CLASS(mctp);
> > + MCTPI2CPacket *pkt = (MCTPI2CPacket *)mctp->buffer;
> > + size_t payload_len;
> > + uint8_t pec, pktseq, msgtype;
> > +
> > + switch (event) {
> > + case I2C_START_SEND:
> > + if (mctp->state == I2C_MCTP_STATE_IDLE) {
> > + mctp->state = I2C_MCTP_STATE_RX_STARTED;
> > + } else if (mctp->state != I2C_MCTP_STATE_RX) {
> > + return -1;
> > + }
> > +
> > + /* the i2c core eats the slave address, so put it back in */
> > + pkt->i2c.dest = i2c->address << 1;
> > + mctp->len = 1;
> > +
> > + return 0;
> > +
> > + case I2C_FINISH:
> > + if (mctp->len < sizeof(MCTPI2CPacket) + 1) {
> > + trace_i2c_mctp_drop_short_packet(mctp->len);
> > + goto drop;
> > + }
> > +
> > + payload_len = mctp->len - (1 + offsetof(MCTPI2CPacket, mctp.payload));
> > +
> > + if (pkt->i2c.byte_count + 3 != mctp->len - 1) {
> > + trace_i2c_mctp_drop_invalid_length(pkt->i2c.byte_count + 3,
> > + mctp->len - 1);
> > + goto drop;
> > + }
> > +
> > + pec = i2c_smbus_pec(0, mctp->buffer, mctp->len - 1);
> > + if (mctp->buffer[mctp->len - 1] != pec) {
> > + trace_i2c_mctp_drop_invalid_pec(mctp->buffer[mctp->len - 1], pec);
> > + goto drop;
> > + }
> > +
> > + if (!(pkt->mctp.hdr.eid.dest == mctp->my_eid ||
> > + pkt->mctp.hdr.eid.dest == 0)) {
> > + trace_i2c_mctp_drop_invalid_eid(pkt->mctp.hdr.eid.dest,
> > + mctp->my_eid);
> > + goto drop;
> > + }
> > +
> > + pktseq = FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, PKTSEQ);
> > +
> > + if (FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, SOM)) {
> > + mctp->tx.is_control = false;
> > +
> > + if (mctp->state == I2C_MCTP_STATE_RX) {
> > + mc->reset(mctp);
> > + }
> > +
> > + mctp->state = I2C_MCTP_STATE_RX;
> > +
> > + mctp->tx.addr = pkt->i2c.source >> 1;
> > + mctp->tx.eid = pkt->mctp.hdr.eid.source;
> > + mctp->tx.tag = FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, TAG);
> > + mctp->tx.pktseq = pktseq;
> > +
> > + msgtype = FIELD_EX8(pkt->mctp.payload[0], MCTP_MESSAGE_H, TYPE);
> > +
> > + if (msgtype == MCTP_MESSAGE_TYPE_CONTROL) {
> > + mctp->tx.is_control = true;
> > +
> > + i2c_mctp_handle_control(mctp);
> > +
> > + return 0;
> > + }
> > + } else if (mctp->state == I2C_MCTP_STATE_RX_STARTED) {
> > + trace_i2c_mctp_drop_expected_som();
> > + goto drop;
> > + } else if (pktseq != (++mctp->tx.pktseq & 0x3)) {
> > + trace_i2c_mctp_drop_invalid_pktseq(pktseq, mctp->tx.pktseq & 0x3);
> > + goto drop;
> > + }
> > +
> > + mc->put_buf(mctp, i2c_mctp_payload(mctp->buffer), payload_len);
>
> Given this returns -1 on error should probably handle errors.
>
Yes.
The event callback should only potentially return -1 in the case of
I2C_START_SEND, so I just do a `goto drop` here.
>
> > +
> > + if (FIELD_EX8(pkt->mctp.hdr.flags, MCTP_H_FLAGS, EOM)) {
> > + mc->handle(mctp);
> > + mctp->state = I2C_MCTP_STATE_WAIT_TX;
> > + }
> > +
> > + return 0;
> > +
> > + default:
> > + return -1;
> > + }
> > +
> > +drop:
> > + mc->reset(mctp);
> > +
> > + mctp->state = I2C_MCTP_STATE_IDLE;
> > +
> > + return 0;
> > +}
>
> ...
>
>
> > diff --git a/include/hw/i2c/mctp.h b/include/hw/i2c/mctp.h
> > new file mode 100644
> > index 000000000000..fccbf249cdbe
> > --- /dev/null
> > +++ b/include/hw/i2c/mctp.h
> > @@ -0,0 +1,127 @@
> > +#ifndef QEMU_I2C_MCTP_H
> > +#define QEMU_I2C_MCTP_H
> > +
> > +#include "qom/object.h"
> > +#include "hw/qdev-core.h"
> > +
> > +#define TYPE_MCTP_I2C_ENDPOINT "mctp-i2c-endpoint"
> > +OBJECT_DECLARE_TYPE(MCTPI2CEndpoint, MCTPI2CEndpointClass, MCTP_I2C_ENDPOINT)
> > +
> > +struct MCTPI2CEndpointClass {
> > + I2CSlaveClass parent_class;
> > +
> > + /**
> > + *
>
> Drop the blank line for consistency with the other comments.
>
> > + * put_buf() - receive incoming message fragment
> > + *
> > + * Must returns 0 for succes or -1 for error.
>
> I would expect any negative to count as error rather than just -1.
> Also, simple imperative should be clear enough
> * Return 0 for success or negative for error.
>
> > + */
> > + int (*put_buf)(MCTPI2CEndpoint *mctp, uint8_t *buf, size_t len);
> > +
> > + /**
> > + * get_buf() - provide pointer to message fragment
> > + *
> > + * Called by the mctp subsystem to request a pointer to the next message
> > + * fragment. The implementation must advance its internal position such
> > + * that successive calls returns the next fragments.
> Subsequent call with return next fragment.
>
> Up to the implementation to decide how it does this.
>
> > + *
> > + * Must return the number of bytes available.
> Return number of bytes in message fragment.
>
> Available might mean in all fragments.
>
Thanks for these suggestions, I worked that in.
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^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2023-09-04 10:50 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-08-23 9:21 [PATCH v4 0/3] hw/{i2c,nvme}: mctp endpoint, nvme management interface model Klaus Jensen
2023-08-23 9:21 ` [PATCH v4 1/3] hw/i2c: add smbus pec utility function Klaus Jensen
2023-08-30 13:04 ` Jonathan Cameron via
2023-08-23 9:21 ` [PATCH v4 2/3] hw/i2c: add mctp core Klaus Jensen
2023-08-30 14:31 ` Jonathan Cameron via
2023-09-04 10:49 ` Klaus Jensen
2023-08-23 9:22 ` [PATCH v4 3/3] hw/nvme: add nvme management interface model Klaus Jensen
2023-08-30 14:47 ` Jonathan Cameron via
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