[GitHub] [mynewt-nimble] kasjer commented on a change in pull request #819: Add USB transport to NimBLE controller

[GitBox <gi...@apache.org>]

kasjer commented on a change in pull request #819:
URL: https://github.com/apache/mynewt-nimble/pull/819#discussion_r427831441



##########
File path: nimble/transport/usb/src/ble_hci_usb.c
##########
@@ -0,0 +1,420 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include <assert.h>
+#include <stddef.h>
+#include "syscfg/syscfg.h"
+#include "sysinit/sysinit.h"
+#include "os/os.h"
+
+#include "nimble/ble.h"
+#include "nimble/ble_hci_trans.h"
+#include "nimble/hci_common.h"
+#include "transport/usb/ble_hci_usb.h"
+
+#include <class/bth/bth_device.h>
+
+/*
+ * The MBUF payload size must accommodate the HCI data header size plus the
+ * maximum ACL data packet length. The ACL block size is the size of the
+ * mbufs we will allocate.
+ */
+#define ACL_BLOCK_SIZE  OS_ALIGN(MYNEWT_VAL(BLE_ACL_BUF_SIZE) \
+                                 + BLE_MBUF_MEMBLOCK_OVERHEAD \
+                                 + BLE_HCI_DATA_HDR_SZ, OS_ALIGNMENT)
+
+struct usb_ble_hci_pool_cmd {
+    uint8_t cmd[BLE_HCI_TRANS_CMD_SZ];
+    bool allocated;
+};
+
+/* (Pseudo)pool for HCI commands */
+static struct usb_ble_hci_pool_cmd usb_ble_hci_pool_cmd;
+
+static ble_hci_trans_rx_cmd_fn *ble_hci_usb_rx_cmd_ll_cb;
+static void *ble_hci_usb_rx_cmd_ll_arg;
+
+static ble_hci_trans_rx_acl_fn *ble_hci_usb_rx_acl_ll_cb;
+static void *ble_hci_usb_rx_acl_ll_arg;
+
+static struct os_mempool ble_hci_usb_evt_hi_pool;
+static os_membuf_t ble_hci_usb_evt_hi_buf[
+    OS_MEMPOOL_SIZE(MYNEWT_VAL(BLE_HCI_EVT_HI_BUF_COUNT),
+                    MYNEWT_VAL(BLE_HCI_EVT_BUF_SIZE))
+];
+
+static struct os_mempool ble_hci_usb_evt_lo_pool;
+static os_membuf_t ble_hci_usb_evt_lo_buf[
+    OS_MEMPOOL_SIZE(MYNEWT_VAL(BLE_HCI_EVT_LO_BUF_COUNT),
+                    MYNEWT_VAL(BLE_HCI_EVT_BUF_SIZE))
+];
+
+static uint8_t ble_hci_pool_acl_mempool_buf[
+    OS_MEMPOOL_BYTES(MYNEWT_VAL(BLE_ACL_BUF_COUNT),
+                     ACL_BLOCK_SIZE)];
+static struct os_mempool ble_hci_pool_acl_mempool;
+static struct os_mbuf_pool ble_hci_pool_acl_mbuf_pool;
+
+static struct os_mbuf *incoming_acl_data;
+
+static struct os_mbuf *
+ble_hci_trans_acl_buf_alloc(void)
+{
+    struct os_mbuf *m;
+
+    m = os_mbuf_get_pkthdr(&ble_hci_pool_acl_mbuf_pool,
+                           sizeof(struct ble_mbuf_hdr));
+    return m;
+}
+
+void
+ble_hci_trans_cfg_ll(ble_hci_trans_rx_cmd_fn *cmd_cb,
+                     void *cmd_arg,
+                     ble_hci_trans_rx_acl_fn *acl_cb,
+                     void *acl_arg)
+{
+    ble_hci_usb_rx_cmd_ll_cb = cmd_cb;
+    ble_hci_usb_rx_cmd_ll_arg = cmd_arg;
+    ble_hci_usb_rx_acl_ll_cb = acl_cb;
+    ble_hci_usb_rx_acl_ll_arg = acl_arg;
+}
+
+int
+ble_hci_trans_hs_acl_tx(struct os_mbuf *om)
+{
+    int rc;
+
+    assert(ble_hci_usb_rx_acl_ll_cb != NULL);
+
+    rc = ble_hci_usb_rx_acl_ll_cb(om, ble_hci_usb_rx_acl_ll_arg);
+
+    return rc;
+}
+
+#define BLE_HCI_USB_EVT_COUNT  \
+    (MYNEWT_VAL(BLE_HCI_EVT_HI_BUF_COUNT) + MYNEWT_VAL(BLE_HCI_EVT_LO_BUF_COUNT))
+
+/**
+ * A packet to be sent over the USB.  This can be a command, an event, or ACL
+ * data.
+ */
+struct ble_hci_pkt {
+    STAILQ_ENTRY(ble_hci_pkt) next;
+    void *data;
+};
+
+static struct os_mempool ble_hci_pkt_pool;
+static os_membuf_t ble_hci_pkt_buf[
+    OS_MEMPOOL_SIZE(BLE_HCI_USB_EVT_COUNT + 1 +
+                    MYNEWT_VAL(BLE_HCI_ACL_OUT_COUNT),
+                    sizeof(struct ble_hci_pkt))];
+
+struct tx_queue {
+    STAILQ_HEAD(, ble_hci_pkt) queue;
+};
+
+static struct tx_queue ble_hci_tx_acl_queue = {STAILQ_HEAD_INITIALIZER(ble_hci_tx_acl_queue.queue)};
+static struct tx_queue ble_hci_tx_evt_queue = { STAILQ_HEAD_INITIALIZER(ble_hci_tx_evt_queue.queue) };
+
+/*
+ * TinyUSB callbacks.
+ */
+void
+tud_bt_acl_data_sent_cb(uint16_t sent_bytes)
+{
+    struct os_mbuf *om;
+    struct ble_hci_pkt *acl = STAILQ_FIRST(&ble_hci_tx_acl_queue.queue);
+
+    assert(acl != NULL);
+    om = acl->data;
+    assert(om != NULL && om->om_len >= sent_bytes);
+    os_mbuf_adj(om, sent_bytes);
+
+    while (om != NULL && om->om_len == 0) {
+        acl->data = SLIST_NEXT(om, om_next);
+        os_mbuf_free(om);

Review comment:
       I think ```os_mbuf_free_chain()``` can not be used in this context




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