staging/octeon/ethernet-defines.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * This file is based on code from OCTEON SDK by Cavium Networks.
0004  *
0005  * Copyright (c) 2003-2007 Cavium Networks
0006  */
0007
0008 /*
0009  * A few defines are used to control the operation of this driver:
0010  *  USE_ASYNC_IOBDMA
0011  *      Use asynchronous IO access to hardware. This uses Octeon's asynchronous
0012  *      IOBDMAs to issue IO accesses without stalling. Set this to zero
0013  *      to disable this. Note that IOBDMAs require CVMSEG.
0014  *  REUSE_SKBUFFS_WITHOUT_FREE
0015  *      Allows the TX path to free an skbuff into the FPA hardware pool. This
0016  *      can significantly improve performance for forwarding and bridging, but
0017  *      may be somewhat dangerous. Checks are made, but if any buffer is reused
0018  *      without the proper Linux cleanup, the networking stack may have very
0019  *      bizarre bugs.
0020  */
0021 #ifndef __ETHERNET_DEFINES_H__
0022 #define __ETHERNET_DEFINES_H__
0023
0024 #ifdef CONFIG_NETFILTER
0025 #define REUSE_SKBUFFS_WITHOUT_FREE  0
0026 #else
0027 #define REUSE_SKBUFFS_WITHOUT_FREE  1
0028 #endif
0029
0030 #define USE_ASYNC_IOBDMA        (CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0)
0031
0032 /* Maximum number of SKBs to try to free per xmit packet. */
0033 #define MAX_OUT_QUEUE_DEPTH     1000
0034
0035 #define FAU_TOTAL_TX_TO_CLEAN (CVMX_FAU_REG_END - sizeof(u32))
0036 #define FAU_NUM_PACKET_BUFFERS_TO_FREE (FAU_TOTAL_TX_TO_CLEAN - sizeof(u32))
0037
0038 #define TOTAL_NUMBER_OF_PORTS       (CVMX_PIP_NUM_INPUT_PORTS + 1)
0039
0040 #endif /* __ETHERNET_DEFINES_H__ */