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fix(bt_rfcomm): size RFCOMM TX buffers by peer MTU

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This commit is contained in:
hejiaxin
2026-08-27 15:10:28 +08:00
parent b58556b338
commit 53200e1ec4
1 changed files with 11 additions and 6 deletions
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17
components/bt/host/bluedroid/stack/rfcomm/port_api.c
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@@ -1627,6 +1627,7 @@ int PORT_WriteData (UINT16 handle, char *p_data, UINT16 max_len, UINT16 *p_len)
UINT32 event = 0;
int rc = 0;
UINT16 length;
UINT16 hdr_overhead, capacity;
RFCOMM_TRACE_API ("PORT_WriteData() max_len:%d", max_len);
@@ -1669,6 +1670,13 @@ int PORT_WriteData (UINT16 handle, char *p_data, UINT16 max_len, UINT16 *p_len)
osi_mutex_global_unlock();
hdr_overhead = (UINT16)(sizeof(BT_HDR) + L2CAP_MIN_OFFSET + RFCOMM_DATA_OVERHEAD + L2CAP_FCS_LEN);
capacity = RFCOMM_DATA_BUF_SIZE - hdr_overhead;
/* Data beyond the peer MTU can never be placed in the buffer, so don't allocate room for it */
if (p_port->peer_mtu < capacity) {
capacity = p_port->peer_mtu;
}
while (max_len) {
/* if we're over buffer high water mark, we're done */
if ((p_port->tx.queue_size > PORT_TX_HIGH_WM)
@@ -1677,18 +1685,15 @@ int PORT_WriteData (UINT16 handle, char *p_data, UINT16 max_len, UINT16 *p_len)
}
/* continue with rfcomm data write */
p_buf = (BT_HDR *)osi_malloc(RFCOMM_DATA_BUF_SIZE);
p_buf = (BT_HDR *)osi_malloc(hdr_overhead + capacity);
if (!p_buf) {
break;
}
p_buf->offset = L2CAP_MIN_OFFSET + RFCOMM_MIN_OFFSET;
p_buf->layer_specific = RFCOMM_DATA_BUF_SIZE - (UINT16)(sizeof(BT_HDR) + L2CAP_MIN_OFFSET + RFCOMM_DATA_OVERHEAD + L2CAP_FCS_LEN);
/* Length for each buffer is the smaller of GKI buffer, peer MTU, or max_len */
p_buf->layer_specific = capacity;
/* Length for each buffer is the smaller of the buffer capacity or max_len */
length = p_buf->layer_specific;
if (p_port->peer_mtu < length) {
length = p_port->peer_mtu;
}
if (max_len < length) {
length = max_len;
}