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* Copyright Runtime.io 2018. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include "net/buf.h"
#include "mgmt/mgmt.h"
#include "mgmt/buf.h"
#include "smp/smp.h"
#include "mgmt/smp.h"
static mgmt_alloc_rsp_fn zephyr_smp_alloc_rsp;
static mgmt_trim_front_fn zephyr_smp_trim_front;
static mgmt_reset_buf_fn zephyr_smp_reset_buf;
static mgmt_write_at_fn zephyr_smp_write_at;
static mgmt_init_reader_fn zephyr_smp_init_reader;
static mgmt_init_writer_fn zephyr_smp_init_writer;
static mgmt_free_buf_fn zephyr_smp_free_buf;
static smp_tx_rsp_fn zephyr_smp_tx_rsp;
static const struct mgmt_streamer_cfg zephyr_smp_cbor_cfg = {
.alloc_rsp = zephyr_smp_alloc_rsp,
.trim_front = zephyr_smp_trim_front,
.reset_buf = zephyr_smp_reset_buf,
.write_at = zephyr_smp_write_at,
.init_reader = zephyr_smp_init_reader,
.init_writer = zephyr_smp_init_writer,
.free_buf = zephyr_smp_free_buf,
};
void *
zephyr_smp_alloc_rsp(const void *req, void *arg)
{
const struct net_buf_pool *pool;
const struct net_buf *req_nb;
struct net_buf *rsp_nb;
struct zephyr_smp_transport *zst = arg;
req_nb = req;
rsp_nb = mcumgr_buf_alloc();
if (rsp_nb == NULL) {
return NULL;
}
if (zst->zst_ud_copy) {
zst->zst_ud_copy(rsp_nb, req_nb);
} else {
pool = net_buf_pool_get(req_nb->pool_id);
memcpy(net_buf_user_data(rsp_nb),
net_buf_user_data((void *)req_nb),
sizeof(req_nb->user_data));
}
return rsp_nb;
}
static void
zephyr_smp_trim_front(void *buf, size_t len, void *arg)
{
struct net_buf *nb;
nb = buf;
if (len > nb->len) {
len = nb->len;
}
net_buf_pull(nb, len);
}
/**
* Splits an appropriately-sized fragment from the front of a net_buf, as
* neeeded. If the length of the net_buf is greater than specified maximum
* fragment size, a new net_buf is allocated, and data is moved from the source
* net_buf to the new net_buf. If the net_buf is small enough to fit in a
* single fragment, the source net_buf is returned unmodified, and the supplied
* pointer is set to NULL.
*
* This function is expected to be called in a loop until the entire source
* net_buf has been consumed. For example:
*
* struct net_buf *frag;
* struct net_buf *rsp;
* ...
* while (rsp != NULL) {
* frag = zephyr_smp_split_frag(&rsp, zst, get_mtu());
* if (frag == NULL) {
* net_buf_unref(nb);
* return SYS_ENOMEM;
* }
* send_packet(frag)
* }
*
* @param nb The packet to fragment. Upon fragmentation,
* this net_buf is adjusted such that the
* fragment data is removed. If the packet
* constitutes a single fragment, this gets
* set to NULL on success.
* @param arg The zephyr SMP transport pointer.
* @param mtu The maximum payload size of a fragment.
*
* @return The next fragment to send on success;
* NULL on failure.
*/
static struct net_buf *
zephyr_smp_split_frag(struct net_buf **nb, void *arg, u16_t mtu)
{
struct net_buf *frag;
struct net_buf *src;
src = *nb;
if (src->len <= mtu) {
*nb = NULL;
frag = src;
} else {
frag = zephyr_smp_alloc_rsp(src, arg);
/* Copy fragment payload into new buffer. */
net_buf_add_mem(frag, src->data, mtu);
/* Remove fragment from total response. */
zephyr_smp_trim_front(src, mtu, NULL);
}
return frag;
}
static void
zephyr_smp_reset_buf(void *buf, void *arg)
{
net_buf_reset(buf);
}
static int
zephyr_smp_write_at(struct cbor_encoder_writer *writer, size_t offset,
const void *data, size_t len, void *arg)
{
struct cbor_nb_writer *czw;
struct net_buf *nb;
czw = (struct cbor_nb_writer *)writer;
nb = czw->nb;
if (offset > nb->len) {
return MGMT_ERR_EINVAL;
}
if (len > net_buf_tailroom(nb)) {
return MGMT_ERR_EINVAL;
}
memcpy(nb->data + offset, data, len);
if (nb->len < offset + len) {
nb->len = offset + len;
writer->bytes_written = nb->len;
}
return 0;
}
static int
zephyr_smp_tx_rsp(struct smp_streamer *ns, void *rsp, void *arg)
{
struct zephyr_smp_transport *zst;
struct net_buf *frag;
struct net_buf *nb;
u16_t mtu;
int rc;
int i;
zst = arg;
nb = rsp;
mtu = zst->zst_get_mtu(rsp);
if (mtu == 0U) {
/* The transport cannot support a transmission right now. */
return MGMT_ERR_EUNKNOWN;
}
i = 0;
while (nb != NULL) {
frag = zephyr_smp_split_frag(&nb, zst, mtu);
if (frag == NULL) {
return MGMT_ERR_ENOMEM;
}
rc = zst->zst_output(zst, frag);
if (rc != 0) {
return MGMT_ERR_EUNKNOWN;
}
}
return 0;
}
static void
zephyr_smp_free_buf(void *buf, void *arg)
{
struct zephyr_smp_transport *zst = arg;
if (!buf) {
return;
}
if (zst->zst_ud_free) {
zst->zst_ud_free(net_buf_user_data((struct net_buf *)buf));
}
mcumgr_buf_free(buf);
}
static int
zephyr_smp_init_reader(struct cbor_decoder_reader *reader, void *buf,
void *arg)
{
struct cbor_nb_reader *czr;
czr = (struct cbor_nb_reader *)reader;
cbor_nb_reader_init(czr, buf);
return 0;
}
static int
zephyr_smp_init_writer(struct cbor_encoder_writer *writer, void *buf,
void *arg)
{
struct cbor_nb_writer *czw;
czw = (struct cbor_nb_writer *)writer;
cbor_nb_writer_init(czw, buf);
return 0;
}
/**
* Processes a single SMP packet and sends the corresponding response(s).
*/
static int
zephyr_smp_process_packet(struct zephyr_smp_transport *zst,
struct net_buf *nb)
{
struct cbor_nb_reader reader;
struct cbor_nb_writer writer;
struct smp_streamer streamer;
int rc;
streamer = (struct smp_streamer) {
.mgmt_stmr = {
.cfg = &zephyr_smp_cbor_cfg,
.reader = &reader.r,
.writer = &writer.enc,
.cb_arg = zst,
},
.tx_rsp_cb = zephyr_smp_tx_rsp,
};
rc = smp_process_request_packet(&streamer, nb);
return rc;
}
/**
* Processes all received SNP request packets.
*/
static void
zephyr_smp_handle_reqs(struct k_work *work)
{
struct zephyr_smp_transport *zst;
struct net_buf *nb;
zst = (void *)work;
while ((nb = k_fifo_get(&zst->zst_fifo, K_NO_WAIT)) != NULL) {
zephyr_smp_process_packet(zst, nb);
}
}
void
zephyr_smp_transport_init(struct zephyr_smp_transport *zst,
zephyr_smp_transport_out_fn *output_func,
zephyr_smp_transport_get_mtu_fn *get_mtu_func,
zephyr_smp_transport_ud_copy_fn *ud_copy_func,
zephyr_smp_transport_ud_free_fn *ud_free_func)
{
*zst = (struct zephyr_smp_transport) {
.zst_output = output_func,
.zst_get_mtu = get_mtu_func,
.zst_ud_copy = ud_copy_func,
.zst_ud_free = ud_free_func,
};
k_work_init(&zst->zst_work, zephyr_smp_handle_reqs);
k_fifo_init(&zst->zst_fifo);
}
void
zephyr_smp_rx_req(struct zephyr_smp_transport *zst, struct net_buf *nb)
{
k_fifo_put(&zst->zst_fifo, nb);
k_work_submit(&zst->zst_work);
}
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