4898c56010
If we wait for the once-per-second cleanup to free transmit SKBs, sockets with small transmit buffer sizes might spend most of their time blocked waiting for the cleanup. Normally we do a cleanup for each transmitted packet. We add a watchdog type timer so that we also schedule a timeout for 150uS after a packet is transmitted. The watchdog is reset for each transmitted packet, so for high packet rates, it never expires. At these high rates, the cleanups are done for each packet so the extra watchdog initiated cleanups are neither needed nor triggered. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org To: netdev@vger.kernel.org To: gregkh@suse.de Cc: Eric Dumazet <eric.dumazet@gmail.com> Patchwork: http://patchwork.linux-mips.org/patch/968/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> This version has spelling and comment changes based on feedback from Eric Dumazet.
107 lines
4.1 KiB
C
107 lines
4.1 KiB
C
/**********************************************************************
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* Author: Cavium Networks
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*
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* Contact: support@caviumnetworks.com
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* This file is part of the OCTEON SDK
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*
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* Copyright (c) 2003-2007 Cavium Networks
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, Version 2, as
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* published by the Free Software Foundation.
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*
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* This file is distributed in the hope that it will be useful, but
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* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
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* NONINFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this file; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* or visit http://www.gnu.org/licenses/.
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*
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* This file may also be available under a different license from Cavium.
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* Contact Cavium Networks for more information
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**********************************************************************/
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/*
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* A few defines are used to control the operation of this driver:
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* CONFIG_CAVIUM_RESERVE32
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* This kernel config options controls the amount of memory configured
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* in a wired TLB entry for all processes to share. If this is set, the
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* driver will use this memory instead of kernel memory for pools. This
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* allows 32bit userspace application to access the buffers, but also
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* requires all received packets to be copied.
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* CONFIG_CAVIUM_OCTEON_NUM_PACKET_BUFFERS
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* This kernel config option allows the user to control the number of
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* packet and work queue buffers allocated by the driver. If this is zero,
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* the driver uses the default from below.
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* USE_SKBUFFS_IN_HW
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* Tells the driver to populate the packet buffers with kernel skbuffs.
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* This allows the driver to receive packets without copying them. It also
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* means that 32bit userspace can't access the packet buffers.
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* USE_HW_TCPUDP_CHECKSUM
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* Controls if the Octeon TCP/UDP checksum engine is used for packet
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* output. If this is zero, the kernel will perform the checksum in
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* software.
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* USE_ASYNC_IOBDMA
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* Use asynchronous IO access to hardware. This uses Octeon's asynchronous
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* IOBDMAs to issue IO accesses without stalling. Set this to zero
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* to disable this. Note that IOBDMAs require CVMSEG.
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* REUSE_SKBUFFS_WITHOUT_FREE
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* Allows the TX path to free an skbuff into the FPA hardware pool. This
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* can significantly improve performance for forwarding and bridging, but
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* may be somewhat dangerous. Checks are made, but if any buffer is reused
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* without the proper Linux cleanup, the networking stack may have very
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* bizarre bugs.
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*/
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#ifndef __ETHERNET_DEFINES_H__
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#define __ETHERNET_DEFINES_H__
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#include "cvmx-config.h"
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#define OCTEON_ETHERNET_VERSION "1.9"
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#ifndef CONFIG_CAVIUM_RESERVE32
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#define CONFIG_CAVIUM_RESERVE32 0
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#endif
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#define USE_SKBUFFS_IN_HW 1
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#ifdef CONFIG_NETFILTER
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#define REUSE_SKBUFFS_WITHOUT_FREE 0
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#else
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#define REUSE_SKBUFFS_WITHOUT_FREE 1
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#endif
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#define USE_HW_TCPUDP_CHECKSUM 1
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/* Enable Random Early Dropping under load */
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#define USE_RED 1
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#define USE_ASYNC_IOBDMA (CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0)
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/*
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* Allow SW based preamble removal at 10Mbps to workaround PHYs giving
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* us bad preambles.
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*/
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#define USE_10MBPS_PREAMBLE_WORKAROUND 1
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/*
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* Use this to have all FPA frees also tell the L2 not to write data
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* to memory.
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*/
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#define DONT_WRITEBACK(x) (x)
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/* Use this to not have FPA frees control L2 */
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/*#define DONT_WRITEBACK(x) 0 */
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/* Maximum number of SKBs to try to free per xmit packet. */
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#define MAX_OUT_QUEUE_DEPTH 1000
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#define FAU_TOTAL_TX_TO_CLEAN (CVMX_FAU_REG_END - sizeof(uint32_t))
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#define FAU_NUM_PACKET_BUFFERS_TO_FREE (FAU_TOTAL_TX_TO_CLEAN - sizeof(uint32_t))
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#define TOTAL_NUMBER_OF_PORTS (CVMX_PIP_NUM_INPUT_PORTS+1)
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#endif /* __ETHERNET_DEFINES_H__ */
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