Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Stefan Wahren | 512 | 100.00% | 7 | 100.00% |
Total | 512 | 7 |
// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause /* * Copyright (c) 2011, 2012, Atheros Communications Inc. * Copyright (c) 2014, I2SE GmbH */ /* Atheros ethernet framing. Every Ethernet frame is surrounded * by an atheros frame while transmitted over a serial channel; */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include "qca_7k_common.h" u16 qcafrm_create_header(u8 *buf, u16 length) { __le16 len; if (!buf) return 0; len = cpu_to_le16(length); buf[0] = 0xAA; buf[1] = 0xAA; buf[2] = 0xAA; buf[3] = 0xAA; buf[4] = len & 0xff; buf[5] = (len >> 8) & 0xff; buf[6] = 0; buf[7] = 0; return QCAFRM_HEADER_LEN; } EXPORT_SYMBOL_GPL(qcafrm_create_header); u16 qcafrm_create_footer(u8 *buf) { if (!buf) return 0; buf[0] = 0x55; buf[1] = 0x55; return QCAFRM_FOOTER_LEN; } EXPORT_SYMBOL_GPL(qcafrm_create_footer); /* Gather received bytes and try to extract a full ethernet frame by * following a simple state machine. * * Return: QCAFRM_GATHER No ethernet frame fully received yet. * QCAFRM_NOHEAD Header expected but not found. * QCAFRM_INVLEN Atheros frame length is invalid * QCAFRM_NOTAIL Footer expected but not found. * > 0 Number of byte in the fully received * Ethernet frame */ s32 qcafrm_fsm_decode(struct qcafrm_handle *handle, u8 *buf, u16 buf_len, u8 recv_byte) { s32 ret = QCAFRM_GATHER; u16 len; switch (handle->state) { case QCAFRM_HW_LEN0: case QCAFRM_HW_LEN1: /* by default, just go to next state */ handle->state--; if (recv_byte != 0x00) { /* first two bytes of length must be 0 */ handle->state = handle->init; } break; case QCAFRM_HW_LEN2: case QCAFRM_HW_LEN3: handle->state--; break; /* 4 bytes header pattern */ case QCAFRM_WAIT_AA1: case QCAFRM_WAIT_AA2: case QCAFRM_WAIT_AA3: case QCAFRM_WAIT_AA4: if (recv_byte != 0xAA) { ret = QCAFRM_NOHEAD; handle->state = handle->init; } else { handle->state--; } break; /* 2 bytes length. */ /* Borrow offset field to hold length for now. */ case QCAFRM_WAIT_LEN_BYTE0: handle->offset = recv_byte; handle->state = QCAFRM_WAIT_LEN_BYTE1; break; case QCAFRM_WAIT_LEN_BYTE1: handle->offset = handle->offset | (recv_byte << 8); handle->state = QCAFRM_WAIT_RSVD_BYTE1; break; case QCAFRM_WAIT_RSVD_BYTE1: handle->state = QCAFRM_WAIT_RSVD_BYTE2; break; case QCAFRM_WAIT_RSVD_BYTE2: len = handle->offset; if (len > buf_len || len < QCAFRM_MIN_LEN) { ret = QCAFRM_INVLEN; handle->state = handle->init; } else { handle->state = (enum qcafrm_state)(len + 1); /* Remaining number of bytes. */ handle->offset = 0; } break; default: /* Receiving Ethernet frame itself. */ buf[handle->offset] = recv_byte; handle->offset++; handle->state--; break; case QCAFRM_WAIT_551: if (recv_byte != 0x55) { ret = QCAFRM_NOTAIL; handle->state = handle->init; } else { handle->state = QCAFRM_WAIT_552; } break; case QCAFRM_WAIT_552: if (recv_byte != 0x55) { ret = QCAFRM_NOTAIL; handle->state = handle->init; } else { ret = handle->offset; /* Frame is fully received. */ handle->state = handle->init; } break; } return ret; } EXPORT_SYMBOL_GPL(qcafrm_fsm_decode); MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 common"); MODULE_AUTHOR("Qualcomm Atheros Communications"); MODULE_AUTHOR("Stefan Wahren <wahrenst@gmx.net>"); MODULE_LICENSE("Dual BSD/GPL");
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with Cregit http://github.com/cregit/cregit
Version 2.0-RC1