Receives a normal sequenced data packet each time it is coded by the kernel user and called by generic data link control (GDLC).
The DLC I-Frame Data Received routine receives a normal sequenced data packet each time it is coded by the kernel user and called by GDLC.
Each GDLC supports a subset of the data-received routines. It is critical to performance that the I-Frame Data Received routine be coded to minimize the amount of time spent prior to returning to the GDLC that called it.
| Item | Description |
|---|---|
| m | Points to a communications memory buffer (mbuf). |
| ext | Specifies the receive extension parameter. This is a pointer to the dlc_io_ext extended I/O structure for reads. The argument to this parameter must be in the kernel space. |
| Item | Description |
|---|---|
| DLC_FUNC_OK | Indicates that the received I-frame function call is accepted. |
| DLC_FUNC_BUSY | Indicates that the received I-frame function call cannot be accepted at this time. The ioctl command operation DLC_EXIT_LBUSY must be issued later using the ioctl subroutine. |
| DLC_FUNC_RETRY | Indicates that the received I-frame function call cannot be accepted at this time. GDLC should retry this function call later. The actual retry wait period depends on the DLC in use. Excessive retries can be subject to a halt of the link station. |