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SubjectRe: [RESEND PATCH v2 02/15] soc: qcom: add support to APR bus driver
On Thu 14 Dec 09:33 PST 2017, srinivas.kandagatla@linaro.org wrote:

> From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>
> This patch adds support toi APR bus (Asynchronous Packet Router) driver.
> ARP driver is made as a bus driver so that the apr devices can added removed
> more dynamically depending on the state of the services on the dsp.
> APR is used for communication between application processor and QDSP to
> use services on QDSP like Audio and others.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> ---
> drivers/soc/qcom/Kconfig | 8 +
> drivers/soc/qcom/Makefile | 1 +
> drivers/soc/qcom/apr.c | 395 ++++++++++++++++++++++++++++++++++++++++
> include/linux/mod_devicetable.h | 13 ++
> include/linux/soc/qcom/apr.h | 174 ++++++++++++++++++
> 5 files changed, 591 insertions(+)
> create mode 100644 drivers/soc/qcom/apr.c
> create mode 100644 include/linux/soc/qcom/apr.h
>
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index b81374bb6713..1daa39925dd4 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -97,4 +97,12 @@ config QCOM_WCNSS_CTRL
> Client driver for the WCNSS_CTRL SMD channel, used to download nv
> firmware to a newly booted WCNSS chip.
>
> +config QCOM_APR
> + tristate "Qualcomm APR Bus (Asynchronous Packet Router)"
> + depends on (RPMSG_QCOM_SMD || RPMSG_QCOM_GLINK_RPM)

The actual dependency you have is RPMSG. Specifying the individual
transports here causes additional restrictions in how you can mix and
match modules vs builtin (e.g. glink being builtin to get regulators
early and smd built as a module forces apr to be built as a module)

PS, the glink config you're depending on is RPMSG_QCOM_GLINK_SMEM

> + help
> + Enable APR IPC protocol support between
> + application processor and QDSP6. APR is
> + used by audio driver to configure QDSP6
> + ASM, ADM and AFE modules.
> endmenu
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index 40c56f67e94a..9daba7e6d20f 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -10,3 +10,4 @@ obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
> obj-$(CONFIG_QCOM_SMP2P) += smp2p.o
> obj-$(CONFIG_QCOM_SMSM) += smsm.o
> obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
> +obj-$(CONFIG_QCOM_APR) += apr.o
> diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
> new file mode 100644
> index 000000000000..c6f3aa7a375b
> --- /dev/null
> +++ b/drivers/soc/qcom/apr.c
> @@ -0,0 +1,395 @@
> +/* SPDX-License-Identifier: GPL-2.0
> +* Copyright (c) 2011-2016, The Linux Foundation
> +* Copyright (c) 2017, Linaro Limited
> +*/

For some tooling reason the SPDX line should be // commented, i.e this
should be:

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011-2016, The Linux Foundation
* Copyright (c) 2017, Linaro Limited
*/

> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/spinlock.h>
> +#include <linux/list.h>
> +#include <linux/slab.h>
> +#include <linux/of_device.h>
> +#include <linux/soc/qcom/apr.h>
> +#include <linux/rpmsg.h>
> +#include <linux/of.h>
> +
> +struct apr_data {
> + int (*get_data_src)(struct apr_hdr *hdr);
> + int dest_id;
> +};
> +
> +struct apr {
> + struct rpmsg_endpoint *ch;
> + struct device *dev;
> + spinlock_t svcs_lock;
> + struct list_head svcs;
> + int dest_id;
> + const struct apr_data *data;
> +};
> +
> +/* Static CORE service on the ADSP */
> +static const struct apr_device_id core_svc_device_id =
> + ADSP_AUDIO_APR_DEV("CORE", APR_SVC_ADSP_CORE);

How does this work out when we want to use APR for the modem services?

> +
> +/**
> + * apr_send_pkt() - Send a apr message from apr device
> + *
> + * @adev: Pointer to previously registered apr device.
> + * @buf: Pointer to buffer to send
> + *
> + * Return: Will be an negative on packet size on success.
> + */
> +int apr_send_pkt(struct apr_device *adev, uint32_t *buf)

So buf here is a struct apr_hdr followed by arbitrary data. Passing a
reference to an arbitrary chunk of data should be done with a void *.
But you could turn struct apr_hdr into struct apr_packet by adding a
flexible array member at the end of the struct and having this function
take that data type. This would make the prototype self-documenting.


I do, however, not fancy the asymmetry of the send/callback interface
exposed to the client. One takes the raw packet, as it sits in the
transport and the other creates an abstract representation of the same.

Can't you in the callback verify the data and then just pass the same
object up to the client?

> +{
> + struct apr *apr = dev_get_drvdata(adev->dev.parent);
> + struct apr_hdr *hdr;
> + unsigned long flags;
> + int ret;
> +
> + spin_lock_irqsave(&adev->lock, flags);
> +
> + hdr = (struct apr_hdr *)buf;
> + hdr->src_domain = APR_DOMAIN_APPS;
> + hdr->src_svc = adev->svc_id;
> + hdr->dest_domain = adev->domain_id;
> + hdr->dest_svc = adev->svc_id;
> +
> + ret = rpmsg_send(apr->ch, buf, hdr->pkt_size);
> + if (ret) {
> + dev_err(&adev->dev, "Unable to send APR pkt %d\n",
> + hdr->pkt_size);
> + } else {
> + ret = hdr->pkt_size;
> + }
> +
> + spin_unlock_irqrestore(&adev->lock, flags);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(apr_send_pkt);
> +
> +static void apr_dev_release(struct device *dev)
> +{
> + struct apr_device *adev = to_apr_device(dev);
> +
> + kfree(adev);
> +}
> +
> +static int qcom_rpmsg_q6_callback(struct rpmsg_device *rpdev, void *buf,
> + int len, void *priv, u32 addr)
> +{
> + struct apr *apr = dev_get_drvdata(&rpdev->dev);
> + struct apr_client_data data;
> + struct apr_device *p, *c_svc = NULL;
> + struct apr_driver *adrv = NULL;
> + struct apr_hdr *hdr;
> + uint16_t hdr_size;
> + uint16_t msg_type;
> + uint16_t ver;
> + uint16_t src;
> + uint16_t svc;
> +
> + if (!buf || len <= APR_HDR_SIZE) {

rpmsg should never call you with buf = NULL, so no reason to check for
that.

> + dev_err(apr->dev, "APR: Improper apr pkt received:%p %d\n",
> + buf, len);
> + return -EINVAL;
> + }
> +
> + hdr = buf;
> + ver = APR_HDR_FIELD_VER(hdr->hdr_field);
> + if (ver > APR_PKT_VER + 1)
> + return -EINVAL;
> +
> + hdr_size = APR_HDR_FIELD_SIZE_BYTES(hdr->hdr_field);
> + if (hdr_size < APR_HDR_SIZE) {
> + dev_err(apr->dev, "APR: Wrong hdr size:%d\n", hdr_size);
> + return -EINVAL;
> + }
> +
> + if (hdr->pkt_size < APR_HDR_SIZE) {
> + dev_err(apr->dev, "APR: Wrong paket size\n");
> + return -EINVAL;
> + }
> +
> + msg_type = APR_HDR_FIELD_MT(hdr->hdr_field);
> + if (msg_type >= APR_MSG_TYPE_MAX && msg_type != APR_BASIC_RSP_RESULT) {
> + dev_err(apr->dev, "APR: Wrong message type: %d\n", msg_type);
> + return -EINVAL;
> + }
> +
> + if (hdr->src_domain >= APR_DOMAIN_MAX ||
> + hdr->dest_domain >= APR_DOMAIN_MAX ||
> + hdr->src_svc >= APR_SVC_MAX ||
> + hdr->dest_svc >= APR_SVC_MAX) {
> + dev_err(apr->dev, "APR: Wrong APR header\n");
> + return -EINVAL;
> + }
> +
> + svc = hdr->dest_svc;
> + src = apr->data->get_data_src(hdr);

Couldn't we just use src_domain here instead of maintaining this mapping
table in the driver?

Also, looking at the send function, isn't this src just c_svc->svc_id?


> + if (src == APR_DEST_MAX)
> + return -EINVAL;
> +
> + spin_lock(&apr->svcs_lock);
> + list_for_each_entry(p, &apr->svcs, node) {
> + if (svc == p->svc_id) {
> + c_svc = p;
> + if (c_svc->dev.driver)
> + adrv = to_apr_driver(c_svc->dev.driver);
> + break;
> + }
> + }

Keep your services in a idr, keyed by svc_id. This will make the search
O(log(n)), but more importantly it would replace this loop with a single
idr_find().

> + spin_unlock(&apr->svcs_lock);
> +
> + if (!adrv) {
> + dev_err(apr->dev, "APR: service is not registered\n");
> + return -EINVAL;
> + }
> +
> + data.payload_size = hdr->pkt_size - hdr_size;
> + data.opcode = hdr->opcode;
> + data.src = src;
> + data.src_port = hdr->src_port;
> + data.dest_port = hdr->dest_port;
> + data.token = hdr->token;
> + data.msg_type = msg_type;
> +
> + if (data.payload_size > 0)
> + data.payload = (char *)hdr + hdr_size;

Using buf + hdr_size probably makes even more sense, and saves you from
the typecast.

> +
> + adrv->callback(c_svc, &data);
> +
> + return 0;
> +}
> +
> +static const struct apr_device_id *apr_match(const struct apr_device_id *id,
> + const struct apr_device *adev)
> +{
> + while (id->domain_id != 0 || id->svc_id != 0) {
> + if (id->domain_id == adev->domain_id &&
> + id->svc_id == adev->svc_id &&
> + id->client_id == adev->client_id)

Is the client_id significant here? As far as I can tell it's a
identifier of the local "function". Are there multiple client drivers
that would "attach" to the same remote service?

> + return id;
> + id++;
> + }
> + return NULL;
> +}
> +
> +static int apr_device_match(struct device *dev, struct device_driver *drv)
> +{
> + struct apr_device *adev = to_apr_device(dev);
> + struct apr_driver *adrv = to_apr_driver(drv);
> +
> + return !!apr_match(adrv->id_table, adev);

If this remain the only caller of apr_match() you could just inline the
loop here.

> +}
> +
> +static int apr_device_probe(struct device *dev)
> +{
> + struct apr_device *adev;
> + struct apr_driver *adrv;

You don't indent things elsewhere.

> + int ret = 0;
> +
> + adev = to_apr_device(dev);
> + adrv = to_apr_driver(dev->driver);
> +
> + ret = adrv->probe(adev);

Drop ret and just return adrv->probe()

> +
> + return ret;
> +}
> +
> +static int apr_device_remove(struct device *dev)
> +{
> + struct apr_device *adev = to_apr_device(dev);
> + struct apr_driver *adrv;
> + struct apr *apr = dev_get_drvdata(adev->dev.parent);
> +
> + if (dev->driver) {
> + adrv = to_apr_driver(dev->driver);
> + if (adrv->remove)
> + adrv->remove(adev);
> + spin_lock(&apr->svcs_lock);
> + list_del(&adev->node);
> + spin_unlock(&apr->svcs_lock);
> + }
> +
> + return 0;
> +}
> +
> +struct bus_type aprbus_type = {
> + .name = "aprbus",
> + .match = apr_device_match,
> + .probe = apr_device_probe,
> + .remove = apr_device_remove,
> +};
> +EXPORT_SYMBOL_GPL(aprbus_type);
> +
> +/**
> + * apr_add_device() - Add a new apr device
> + *
> + * @dev: Pointer to apr device.
> + * @id: Pointer to apr device id to add.
> + *
> + * Return: Will be an negative on error or a zero on success.
> + */
> +int apr_add_device(struct device *dev, const struct apr_device_id *id)
> +{
> + struct apr *apr = dev_get_drvdata(dev);

It's not obvious which dev this is, but it has to be the rpmsg device or
this would dereference the drvdata of the wrong type and things would be
very bad.

How about making this more explicit by just taking a struct apr * as
first argument, and then provide a helper for clients to acquire the
struct apr * from the parent dev, if this is needed.

> + struct apr_device *adev = NULL;
> +
> + if (!apr)
> + return -EINVAL;
> +
> + adev = kzalloc(sizeof(*adev), GFP_KERNEL);
> + if (!adev)
> + return -ENOMEM;
> +
> + spin_lock_init(&adev->lock);
> +
> + adev->svc_id = id->svc_id;
> + adev->dest_id = apr->dest_id;
> + adev->client_id = id->client_id;
> + adev->domain_id = id->domain_id;

Wouldn't this always be the domain of the apr? (or we're adding a device
to the wrong apr)

> + adev->version = id->svc_version;
> +
> + adev->dev.bus = &aprbus_type;
> + adev->dev.parent = dev;
> + adev->dev.release = apr_dev_release;
> + adev->dev.driver = NULL;
> +
> + dev_set_name(&adev->dev, "apr:%s:%x:%x:%x", id->name, id->domain_id,
> + id->svc_id, id->client_id);
> +
> + spin_lock(&apr->svcs_lock);
> + list_add_tail(&adev->node, &apr->svcs);
> + spin_unlock(&apr->svcs_lock);

This causes svcs to contain entries related to devices that has not been
matched and probed yet (e.g. implementation is in a kernel module not
loaded). I think you should move this to apr_device_probe().

> +
> + return device_register(&adev->dev);
> +}
> +EXPORT_SYMBOL_GPL(apr_add_device);
> +
> +static int qcom_rpmsg_q6_probe(struct rpmsg_device *rpdev)
> +{
> + struct device *dev = &rpdev->dev;
> + struct apr *apr;
> +
> + apr = devm_kzalloc(dev, sizeof(*apr), GFP_KERNEL);
> + if (!apr)
> + return -ENOMEM;
> +
> + apr->data = of_device_get_match_data(dev);
> + if (!apr->data)
> + return -ENODEV;
> +
> + apr->dest_id = apr->data->dest_id;
> + dev_set_drvdata(dev, apr);
> + apr->ch = rpdev->ept;
> + apr->dev = dev;
> + INIT_LIST_HEAD(&apr->svcs);
> +
> + /* register core service */
> + apr_add_device(dev, &core_svc_device_id);
> +
> + return 0;
> +}
> +
> +static int apr_remove_device(struct device *dev, void *null)
> +{
> + struct apr_device *adev = to_apr_device(dev);
> +
> + device_unregister(&adev->dev);
> +
> + return 0;
> +}
> +
> +static void qcom_rpmsg_q6_remove(struct rpmsg_device *rpdev)
> +{
> + device_for_each_child(&rpdev->dev, NULL, apr_remove_device);
> +}
> +
> +static int apr_v2_get_data_src(struct apr_hdr *hdr)
> +{
> + if (hdr->src_domain == APR_DOMAIN_MODEM)
> + return APR_DEST_MODEM;
> + else if (hdr->src_domain == APR_DOMAIN_ADSP)
> + return APR_DEST_QDSP6;
> +
> + return APR_DEST_MAX;

The idiomatic return value here would be -EINVAL.

> +}
> +
> +/*
> + * __apr_driver_register() - Client driver registration with aprbus
> + *
> + * @drv:Client driver to be associated with client-device.
> + * @owner: owning module/driver
> + *
> + * This API will register the client driver with the aprbus
> + * It is called from the driver's module-init function.
> + */
> +int __apr_driver_register(struct apr_driver *drv, struct module *owner)
> +{
> + /* ID table is mandatory to match the devices to probe */
> + if (!drv->id_table)
> + return -EINVAL;
> +
> + drv->driver.bus = &aprbus_type;
> + drv->driver.owner = owner;
> +
> + return driver_register(&drv->driver);
> +}
> +EXPORT_SYMBOL_GPL(__apr_driver_register);
> +
> +/*
> + * apr_driver_unregister() - Undo effect of apr_driver_register
> + *
> + * @drv: Client driver to be unregistered
> + */
> +void apr_driver_unregister(struct apr_driver *drv)
> +{
> + driver_unregister(&drv->driver);
> +}
> +EXPORT_SYMBOL_GPL(apr_driver_unregister);
> +
> +static const struct apr_data apr_v2_data = {
> + .get_data_src = apr_v2_get_data_src,
> + .dest_id = APR_DEST_QDSP6,
> +};
> +
> +static const struct of_device_id qcom_rpmsg_q6_of_match[] = {
> + { .compatible = "qcom,apr-msm8996", .data = &apr_v2_data},

The dest_id of apr_v2_data and the use of "q6" in the name indicates
that this is the "msm8996 adsp apr", what's your plan to support other
apr remotes?

How about making the domain id a property of the apr in DT and then just
list the clients as nodes with svc_id, svc_version and client_id? You
can still match by device_id (compatible can be optional), but that
would allow you to describe either the adsp or modem apr link, of any
platform (of that apr version), with the same compatible.

> + {}
> +};
> +
> +static struct rpmsg_driver qcom_rpmsg_q6_driver = {
> + .probe = qcom_rpmsg_q6_probe,
> + .remove = qcom_rpmsg_q6_remove,
> + .callback = qcom_rpmsg_q6_callback,
> + .drv = {
> + .name = "qcom_rpmsg_q6",
> + .owner = THIS_MODULE,

Drop the owner.

> + .of_match_table = qcom_rpmsg_q6_of_match,
> + },

Indentation.

> +};
> +
> +static int __init apr_init(void)
> +{
> + int ret;
> +
> + ret = register_rpmsg_driver(&qcom_rpmsg_q6_driver);
> + if (!ret)
> + return bus_register(&aprbus_type);

Register the bus first, then the rpmsg driver.

> +
> + return ret;
> +}
> +
> +static void __exit apr_exit(void)
> +{
> + bus_unregister(&aprbus_type);
> + unregister_rpmsg_driver(&qcom_rpmsg_q6_driver);
> +}
> +
> +subsys_initcall(apr_init);
> +module_exit(apr_exit);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Qualcomm APR Bus");
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index abb6dc2ebbf8..068d215c3be6 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -452,6 +452,19 @@ struct spi_device_id {
> kernel_ulong_t driver_data; /* Data private to the driver */
> };
>
> +

One newline is enough.

> +#define APR_NAME_SIZE 32
> +#define APR_MODULE_PREFIX "apr:"
> +
> +struct apr_device_id {
> + char name[APR_NAME_SIZE];

Does this name has any meaning? As far as I can see we're matching on
the other parameters and use the name only to name the device.

> + __u32 domain_id;
> + __u32 svc_id;
> + __u32 client_id;
> + __u32 svc_version;
> + kernel_ulong_t driver_data; /* Data private to the driver */
> +};
> +
> #define SPMI_NAME_SIZE 32
> #define SPMI_MODULE_PREFIX "spmi:"
>
> diff --git a/include/linux/soc/qcom/apr.h b/include/linux/soc/qcom/apr.h
> new file mode 100644
> index 000000000000..8620289c34ab
> --- /dev/null
> +++ b/include/linux/soc/qcom/apr.h
> @@ -0,0 +1,174 @@
> +/* SPDX-License-Identifier: GPL-2.0
> +* Copyright (c) 2011-2016, The Linux Foundation
> +* Copyright (c) 2017, Linaro Limited
> +*/
> +
> +#ifndef __APR_H_
> +#define __APR_H_
> +
> +#include <linux/spinlock.h>
> +#include <linux/device.h>
> +#include <linux/mod_devicetable.h>
> +/* APR Client IDs */
> +#define APR_CLIENT_AUDIO 0x0
> +#define APR_CLIENT_VOICE 0x1
> +#define APR_CLIENT_MAX 0x2
> +
> +#define APR_DL_SMD 0
> +#define APR_DL_MAX 1
Unused.

> +
> +#define APR_DEST_MODEM 0
> +#define APR_DEST_QDSP6 1
> +#define APR_DEST_MAX 2
> +#define APR_MAX_BUF 8192
> +
> +#define APR_HDR_LEN(hdr_len) ((hdr_len)/4)
> +#define APR_PKT_SIZE(hdr_len, payload_len) ((hdr_len) + (payload_len))
> +#define APR_HDR_FIELD(msg_type, hdr_len, ver)\
> + (((msg_type & 0x3) << 8) | ((hdr_len & 0xF) << 4) | (ver & 0xF))
> +
> +#define APR_HDR_SIZE sizeof(struct apr_hdr)
> +#define APR_SEQ_CMD_HDR_FIELD APR_HDR_FIELD(APR_MSG_TYPE_SEQ_CMD, \
> + APR_HDR_LEN(APR_HDR_SIZE), \
> + APR_PKT_VER)

So for the tx path these macros are to be used by the client and for the
rx path they are to be used by the apr driver. Better make the api
symmetrical.

One possible path is to use an sk_buf for the tx-path and reserve space
for the header, then pass the abstract version of the packet and let the
apr driver fill out the header.

> +
> +/* Version */
> +#define APR_PKT_VER 0x0
> +
> +/* Command and Response Types */
> +#define APR_MSG_TYPE_EVENT 0x0
> +#define APR_MSG_TYPE_CMD_RSP 0x1
> +#define APR_MSG_TYPE_SEQ_CMD 0x2
> +#define APR_MSG_TYPE_NSEQ_CMD 0x3
> +#define APR_MSG_TYPE_MAX 0x04
> +
> +/* APR Basic Response Message */
> +#define APR_BASIC_RSP_RESULT 0x000110E8
> +#define APR_RSP_ACCEPTED 0x000100BE
> +
> +/* Domain IDs */
> +#define APR_DOMAIN_SIM 0x1
> +#define APR_DOMAIN_PC 0x2
> +#define APR_DOMAIN_MODEM 0x3
> +#define APR_DOMAIN_ADSP 0x4
> +#define APR_DOMAIN_APPS 0x5
> +#define APR_DOMAIN_MAX 0x6
> +
> +/* ADSP service IDs */
> +#define APR_SVC_TEST_CLIENT 0x2
> +#define APR_SVC_ADSP_CORE 0x3
> +#define APR_SVC_AFE 0x4
> +#define APR_SVC_VSM 0x5
> +#define APR_SVC_VPM 0x6
> +#define APR_SVC_ASM 0x7
> +#define APR_SVC_ADM 0x8
> +#define APR_SVC_ADSP_MVM 0x09
> +#define APR_SVC_ADSP_CVS 0x0A
> +#define APR_SVC_ADSP_CVP 0x0B
> +#define APR_SVC_USM 0x0C
> +#define APR_SVC_LSM 0x0D
> +#define APR_SVC_VIDC 0x16
> +#define APR_SVC_MAX 0x17
> +
> +/* Modem Service IDs */
> +#define APR_SVC_MVS 0x3
> +#define APR_SVC_MVM 0x4
> +#define APR_SVC_CVS 0x5
> +#define APR_SVC_CVP 0x6
> +#define APR_SVC_SRD 0x7
> +
> +/* APR Port IDs */
> +#define APR_MAX_PORTS 0x80
> +#define APR_NAME_MAX 0x40
> +#define RESET_EVENTS 0x000130D7
> +
> +/* hdr field Ver [0:3], Size [4:7], Message type [8:10] */
> +#define APR_HDR_FIELD_VER(h) (h & 0x000F)
> +#define APR_HDR_FIELD_SIZE(h) ((h & 0x00F0) >> 4)
> +#define APR_HDR_FIELD_SIZE_BYTES(h) (((h & 0x00F0) >> 4) * 4)
> +#define APR_HDR_FIELD_MT(h) ((h & 0x0300) >> 8)
> +
> +struct apr_hdr {
> + uint16_t hdr_field;
> + uint16_t pkt_size;
> + uint8_t src_svc;
> + uint8_t src_domain;
> + uint16_t src_port;
> + uint8_t dest_svc;
> + uint8_t dest_domain;
> + uint16_t dest_port;
> + uint32_t token;
> + uint32_t opcode;
> +};
> +
> +struct apr_client_data {

Perhaps name this apr_client_message or similar, to indicate that this
is not a per-client thing, but a description of a message/packet.

> + uint16_t payload_size;
> + uint16_t hdr_len;
> + uint16_t msg_type;
> + uint16_t src;
> + uint16_t dest_svc;
> + uint16_t src_port;
> + uint16_t dest_port;
> + uint32_t token;
> + uint32_t opcode;
> + void *payload;
> +};
> +

Regards,
Bjorn

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