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This patch provides a sysfs interface to change some properties of the ibmveth buffer pools (size of the buffers, number of buffers per pool, and whether a pool is active). Ethernet drivers use ethtool to provide this type of functionality. However, the buffers in the ibmveth driver can have an arbitrary size (not only regular, mini, and jumbo which are the only sizes that ethtool can change), and also ibmveth can have an arbitrary number of buffer pools Under heavy load we have seen dropped packets which obviously kills TCP performance. We have created several fixes that mitigate this issue, but we definitely need a way of changing the number of buffers for an adapter dynamically. Also, changing the size of the buffers allows users to change the MTU to something big (bigger than a jumbo frame) greatly improving performance on partition to partition transfers. The patch creates directories pool1...pool4 in the device directory in sysfs, each with files: num, size, and active (which default to the values in the mainline version). Comments and suggestions are welcome... -- Santiago A. Leon Power Linux Development IBM Linux Technology Center Signed-off-by: Jeff Garzik <jeff@garzik.org>
164 lines
5.7 KiB
C
164 lines
5.7 KiB
C
/**************************************************************************/
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/* */
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/* IBM eServer i/[Series Virtual Ethernet Device Driver */
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/* Copyright (C) 2003 IBM Corp. */
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/* Dave Larson (larson1@us.ibm.com) */
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/* Santiago Leon (santil@us.ibm.com) */
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/* */
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/* This program is free software; you can redistribute it and/or modify */
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/* it under the terms of the GNU General Public License as published by */
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/* the Free Software Foundation; either version 2 of the License, or */
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/* (at your option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, */
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/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
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/* GNU General Public License for more 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 program; if not, write to the Free Software */
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/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 */
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/* USA */
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/* */
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/**************************************************************************/
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#ifndef _IBMVETH_H
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#define _IBMVETH_H
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#define IbmVethMaxSendFrags 6
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/* constants for H_MULTICAST_CTRL */
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#define IbmVethMcastReceptionModifyBit 0x80000UL
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#define IbmVethMcastReceptionEnableBit 0x20000UL
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#define IbmVethMcastFilterModifyBit 0x40000UL
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#define IbmVethMcastFilterEnableBit 0x10000UL
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#define IbmVethMcastEnableRecv (IbmVethMcastReceptionModifyBit | IbmVethMcastReceptionEnableBit)
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#define IbmVethMcastDisableRecv (IbmVethMcastReceptionModifyBit)
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#define IbmVethMcastEnableFiltering (IbmVethMcastFilterModifyBit | IbmVethMcastFilterEnableBit)
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#define IbmVethMcastDisableFiltering (IbmVethMcastFilterModifyBit)
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#define IbmVethMcastAddFilter 0x1UL
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#define IbmVethMcastRemoveFilter 0x2UL
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#define IbmVethMcastClearFilterTable 0x3UL
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/* hcall numbers */
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#define H_VIO_SIGNAL 0x104
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#define H_REGISTER_LOGICAL_LAN 0x114
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#define H_FREE_LOGICAL_LAN 0x118
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#define H_ADD_LOGICAL_LAN_BUFFER 0x11C
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#define H_SEND_LOGICAL_LAN 0x120
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#define H_MULTICAST_CTRL 0x130
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#define H_CHANGE_LOGICAL_LAN_MAC 0x14C
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#define H_FREE_LOGICAL_LAN_BUFFER 0x1D4
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/* hcall macros */
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#define h_register_logical_lan(ua, buflst, rxq, fltlst, mac) \
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plpar_hcall_norets(H_REGISTER_LOGICAL_LAN, ua, buflst, rxq, fltlst, mac)
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#define h_free_logical_lan(ua) \
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plpar_hcall_norets(H_FREE_LOGICAL_LAN, ua)
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#define h_add_logical_lan_buffer(ua, buf) \
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plpar_hcall_norets(H_ADD_LOGICAL_LAN_BUFFER, ua, buf)
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#define h_send_logical_lan(ua, buf1, buf2, buf3, buf4, buf5, buf6, correlator) \
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plpar_hcall_8arg_2ret(H_SEND_LOGICAL_LAN, ua, buf1, buf2, buf3, buf4, buf5, buf6, correlator, &correlator)
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#define h_multicast_ctrl(ua, cmd, mac) \
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plpar_hcall_norets(H_MULTICAST_CTRL, ua, cmd, mac)
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#define h_change_logical_lan_mac(ua, mac) \
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plpar_hcall_norets(H_CHANGE_LOGICAL_LAN_MAC, ua, mac)
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#define h_free_logical_lan_buffer(ua, bufsize) \
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plpar_hcall_norets(H_FREE_LOGICAL_LAN_BUFFER, ua, bufsize)
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#define IbmVethNumBufferPools 5
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#define IBMVETH_BUFF_OH 22 /* Overhead: 14 ethernet header + 8 opaque handle */
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#define IBMVETH_MAX_MTU 68
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#define IBMVETH_MAX_POOL_COUNT 4096
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#define IBMVETH_MAX_BUF_SIZE (1024 * 128)
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static int pool_size[] = { 512, 1024 * 2, 1024 * 16, 1024 * 32, 1024 * 64 };
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static int pool_count[] = { 256, 768, 256, 256, 256 };
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static int pool_active[] = { 1, 1, 0, 0, 0};
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#define IBM_VETH_INVALID_MAP ((u16)0xffff)
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struct ibmveth_buff_pool {
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u32 size;
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u32 index;
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u32 buff_size;
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u32 threshold;
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atomic_t available;
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u32 consumer_index;
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u32 producer_index;
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u16 *free_map;
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dma_addr_t *dma_addr;
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struct sk_buff **skbuff;
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int active;
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struct kobject kobj;
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};
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struct ibmveth_rx_q {
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u64 index;
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u64 num_slots;
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u64 toggle;
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dma_addr_t queue_dma;
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u32 queue_len;
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struct ibmveth_rx_q_entry *queue_addr;
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};
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struct ibmveth_adapter {
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struct vio_dev *vdev;
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struct net_device *netdev;
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struct net_device_stats stats;
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unsigned int mcastFilterSize;
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unsigned long mac_addr;
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unsigned long liobn;
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void * buffer_list_addr;
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void * filter_list_addr;
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dma_addr_t buffer_list_dma;
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dma_addr_t filter_list_dma;
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struct ibmveth_buff_pool rx_buff_pool[IbmVethNumBufferPools];
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struct ibmveth_rx_q rx_queue;
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int pool_config;
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/* adapter specific stats */
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u64 replenish_task_cycles;
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u64 replenish_no_mem;
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u64 replenish_add_buff_failure;
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u64 replenish_add_buff_success;
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u64 rx_invalid_buffer;
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u64 rx_no_buffer;
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u64 tx_multidesc_send;
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u64 tx_linearized;
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u64 tx_linearize_failed;
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u64 tx_map_failed;
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u64 tx_send_failed;
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spinlock_t stats_lock;
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};
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struct ibmveth_buf_desc_fields {
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u32 valid : 1;
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u32 toggle : 1;
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u32 reserved : 6;
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u32 length : 24;
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u32 address;
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};
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union ibmveth_buf_desc {
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u64 desc;
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struct ibmveth_buf_desc_fields fields;
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};
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struct ibmveth_rx_q_entry {
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u16 toggle : 1;
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u16 valid : 1;
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u16 reserved : 14;
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u16 offset;
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u32 length;
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u64 correlator;
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};
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#endif /* _IBMVETH_H */
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