diff options
Diffstat (limited to 'drivers/net/ibmveth.c')
| -rw-r--r-- | drivers/net/ibmveth.c | 1175 |
1 files changed, 1175 insertions, 0 deletions
diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c new file mode 100644 index 000000000000..c39b0609742a --- /dev/null +++ b/drivers/net/ibmveth.c @@ -0,0 +1,1175 @@ +/**************************************************************************/ +/* */ +/* IBM eServer i/pSeries Virtual Ethernet Device Driver */ +/* Copyright (C) 2003 IBM Corp. */ +/* Originally written by Dave Larson (larson1@us.ibm.com) */ +/* Maintained by Santiago Leon (santil@us.ibm.com) */ +/* */ +/* This program is free software; you can redistribute it and/or modify */ +/* it under the terms of the GNU General Public License as published by */ +/* the Free Software Foundation; either version 2 of the License, or */ +/* (at your option) any later version. */ +/* */ +/* This program is distributed in the hope that it will be useful, */ +/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ +/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ +/* GNU General Public License for more details. */ +/* */ +/* You should have received a copy of the GNU General Public License */ +/* along with this program; if not, write to the Free Software */ +/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 */ +/* USA */ +/* */ +/* This module contains the implementation of a virtual ethernet device */ +/* for use with IBM i/pSeries LPAR Linux. It utilizes the logical LAN */ +/* option of the RS/6000 Platform Architechture to interface with virtual */ +/* ethernet NICs that are presented to the partition by the hypervisor. */ +/* */ +/**************************************************************************/ +/* + TODO: + - remove frag processing code - no longer needed + - add support for sysfs + - possibly remove procfs support +*/ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/version.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/dma-mapping.h> +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/mm.h> +#include <linux/ethtool.h> +#include <linux/proc_fs.h> +#include <asm/semaphore.h> +#include <asm/hvcall.h> +#include <asm/atomic.h> +#include <asm/iommu.h> +#include <asm/vio.h> +#include <asm/uaccess.h> +#include <linux/seq_file.h> + +#include "ibmveth.h" + +#define DEBUG 1 + +#define ibmveth_printk(fmt, args...) \ + printk(KERN_INFO "%s: " fmt, __FILE__, ## args) + +#define ibmveth_error_printk(fmt, args...) \ + printk(KERN_ERR "(%s:%3.3d ua:%x) ERROR: " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args) + +#ifdef DEBUG +#define ibmveth_debug_printk_no_adapter(fmt, args...) \ + printk(KERN_DEBUG "(%s:%3.3d): " fmt, __FILE__, __LINE__ , ## args) +#define ibmveth_debug_printk(fmt, args...) \ + printk(KERN_DEBUG "(%s:%3.3d ua:%x): " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args) +#define ibmveth_assert(expr) \ + if(!(expr)) { \ + printk(KERN_DEBUG "assertion failed (%s:%3.3d ua:%x): %s\n", __FILE__, __LINE__, adapter->vdev->unit_address, #expr); \ + BUG(); \ + } +#else +#define ibmveth_debug_printk_no_adapter(fmt, args...) +#define ibmveth_debug_printk(fmt, args...) +#define ibmveth_assert(expr) +#endif + +static int ibmveth_open(struct net_device *dev); +static int ibmveth_close(struct net_device *dev); +static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); +static int ibmveth_poll(struct net_device *dev, int *budget); +static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *dev); +static struct net_device_stats *ibmveth_get_stats(struct net_device *dev); +static void ibmveth_set_multicast_list(struct net_device *dev); +static int ibmveth_change_mtu(struct net_device *dev, int new_mtu); +static void ibmveth_proc_register_driver(void); +static void ibmveth_proc_unregister_driver(void); +static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter); +static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter); +static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs); +static inline void ibmveth_schedule_replenishing(struct ibmveth_adapter*); + +#ifdef CONFIG_PROC_FS +#define IBMVETH_PROC_DIR "ibmveth" +static struct proc_dir_entry *ibmveth_proc_dir; +#endif + +static const char ibmveth_driver_name[] = "ibmveth"; +static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver"; +#define ibmveth_driver_version "1.03" + +MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>"); +MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(ibmveth_driver_version); + +/* simple methods of getting data from the current rxq entry */ +static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter) +{ + return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].toggle == adapter->rx_queue.toggle); +} + +static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter) +{ + return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].valid); +} + +static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter) +{ + return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].offset); +} + +static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter) +{ + return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length); +} + +/* setup the initial settings for a buffer pool */ +static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size) +{ + pool->size = pool_size; + pool->index = pool_index; + pool->buff_size = buff_size; + pool->threshold = pool_size / 2; +} + +/* allocate and setup an buffer pool - called during open */ +static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool) +{ + int i; + + pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL); + + if(!pool->free_map) { + return -1; + } + + pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL); + if(!pool->dma_addr) { + kfree(pool->free_map); + pool->free_map = NULL; + return -1; + } + + pool->skbuff = kmalloc(sizeof(void*) * pool->size, GFP_KERNEL); + + if(!pool->skbuff) { + kfree(pool->dma_addr); + pool->dma_addr = NULL; + + kfree(pool->free_map); + pool->free_map = NULL; + return -1; + } + + memset(pool->skbuff, 0, sizeof(void*) * pool->size); + memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size); + + for(i = 0; i < pool->size; ++i) { + pool->free_map[i] = i; + } + + atomic_set(&pool->available, 0); + pool->producer_index = 0; + pool->consumer_index = 0; + + return 0; +} + +/* replenish the buffers for a pool. note that we don't need to + * skb_reserve these since they are used for incoming... + */ +static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool) +{ + u32 i; + u32 count = pool->size - atomic_read(&pool->available); + u32 buffers_added = 0; + + mb(); + + for(i = 0; i < count; ++i) { + struct sk_buff *skb; + unsigned int free_index, index; + u64 correlator; + union ibmveth_buf_desc desc; + unsigned long lpar_rc; + dma_addr_t dma_addr; + + skb = alloc_skb(pool->buff_size, GFP_ATOMIC); + + if(!skb) { + ibmveth_debug_printk("replenish: unable to allocate skb\n"); + adapter->replenish_no_mem++; + break; + } + + free_index = pool->consumer_index++ % pool->size; + index = pool->free_map[free_index]; + + ibmveth_assert(index != IBM_VETH_INVALID_MAP); + ibmveth_assert(pool->skbuff[index] == NULL); + + dma_addr = dma_map_single(&adapter->vdev->dev, skb->data, + pool->buff_size, DMA_FROM_DEVICE); + + pool->free_map[free_index] = IBM_VETH_INVALID_MAP; + pool->dma_addr[index] = dma_addr; + pool->skbuff[index] = skb; + + correlator = ((u64)pool->index << 32) | index; + *(u64*)skb->data = correlator; + + desc.desc = 0; + desc.fields.valid = 1; + desc.fields.length = pool->buff_size; + desc.fields.address = dma_addr; + + lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc); + + if(lpar_rc != H_Success) { + pool->free_map[free_index] = IBM_VETH_INVALID_MAP; + pool->skbuff[index] = NULL; + pool->consumer_index--; + dma_unmap_single(&adapter->vdev->dev, + pool->dma_addr[index], pool->buff_size, + DMA_FROM_DEVICE); + dev_kfree_skb_any(skb); + adapter->replenish_add_buff_failure++; + break; + } else { + buffers_added++; + adapter->replenish_add_buff_success++; + } + } + + mb(); + atomic_add(buffers_added, &(pool->available)); +} + +/* check if replenishing is needed. */ +static inline int ibmveth_is_replenishing_needed(struct ibmveth_adapter *adapter) +{ + return ((atomic_read(&adapter->rx_buff_pool[0].available) < adapter->rx_buff_pool[0].threshold) || + (atomic_read(&adapter->rx_buff_pool[1].available) < adapter->rx_buff_pool[1].threshold) || + (atomic_read(&adapter->rx_buff_pool[2].available) < adapter->rx_buff_pool[2].threshold)); +} + +/* kick the replenish tasklet if we need replenishing and it isn't already running */ +static inline void ibmveth_schedule_replenishing(struct ibmveth_adapter *adapter) +{ + if(ibmveth_is_replenishing_needed(adapter) && + (atomic_dec_if_positive(&adapter->not_replenishing) == 0)) { + schedule_work(&adapter->replenish_task); + } +} + +/* replenish tasklet routine */ +static void ibmveth_replenish_task(struct ibmveth_adapter *adapter) +{ + adapter->replenish_task_cycles++; + + ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[0]); + ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[1]); + ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[2]); + + adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8); + + atomic_inc(&adapter->not_replenishing); + + ibmveth_schedule_replenishing(adapter); +} + +/* empty and free ana buffer pool - also used to do cleanup in error paths */ +static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool) +{ + int i; + + if(pool->free_map) { + kfree(pool->free_map); + pool->free_map = NULL; + } + + if(pool->skbuff && pool->dma_addr) { + for(i = 0; i < pool->size; ++i) { + struct sk_buff *skb = pool->skbuff[i]; + if(skb) { + dma_unmap_single(&adapter->vdev->dev, + pool->dma_addr[i], + pool->buff_size, + DMA_FROM_DEVICE); + dev_kfree_skb_any(skb); + pool->skbuff[i] = NULL; + } + } + } + + if(pool->dma_addr) { + kfree(pool->dma_addr); + pool->dma_addr = NULL; + } + + if(pool->skbuff) { + kfree(pool->skbuff); + pool->skbuff = NULL; + } +} + +/* remove a buffer from a pool */ +static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter, u64 correlator) +{ + unsigned int pool = correlator >> 32; + unsigned int index = correlator & 0xffffffffUL; + unsigned int free_index; + struct sk_buff *skb; + + ibmveth_assert(pool < IbmVethNumBufferPools); + ibmveth_assert(index < adapter->rx_buff_pool[pool].size); + + skb = adapter->rx_buff_pool[pool].skbuff[index]; + + ibmveth_assert(skb != NULL); + + adapter->rx_buff_pool[pool].skbuff[index] = NULL; + + dma_unmap_single(&adapter->vdev->dev, + adapter->rx_buff_pool[pool].dma_addr[index], + adapter->rx_buff_pool[pool].buff_size, + DMA_FROM_DEVICE); + + free_index = adapter->rx_buff_pool[pool].producer_index++ % adapter->rx_buff_pool[pool].size; + adapter->rx_buff_pool[pool].free_map[free_index] = index; + + mb(); + + atomic_dec(&(adapter->rx_buff_pool[pool].available)); +} + +/* get the current buffer on the rx queue */ +static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter) +{ + u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator; + unsigned int pool = correlator >> 32; + unsigned int index = correlator & 0xffffffffUL; + + ibmveth_assert(pool < IbmVethNumBufferPools); + ibmveth_assert(index < adapter->rx_buff_pool[pool].size); + + return adapter->rx_buff_pool[pool].skbuff[index]; +} + +/* recycle the current buffer on the rx queue */ +static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter) +{ + u32 q_index = adapter->rx_queue.index; + u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator; + unsigned int pool = correlator >> 32; + unsigned int index = correlator & 0xffffffffUL; + union ibmveth_buf_desc desc; + unsigned long lpar_rc; + + ibmveth_assert(pool < IbmVethNumBufferPools); + ibmveth_assert(index < adapter->rx_buff_pool[pool].size); + + desc.desc = 0; + desc.fields.valid = 1; + desc.fields.length = adapter->rx_buff_pool[pool].buff_size; + desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index]; + + lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc); + + if(lpar_rc != H_Success) { + ibmveth_debug_printk("h_add_logical_lan_buffer failed during recycle rc=%ld", lpar_rc); + ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator); + } + + if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) { + adapter->rx_queue.index = 0; + adapter->rx_queue.toggle = !adapter->rx_queue.toggle; + } +} + +static inline void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter) +{ + ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator); + + if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) { + adapter->rx_queue.index = 0; + adapter->rx_queue.toggle = !adapter->rx_queue.toggle; + } +} + +static void ibmveth_cleanup(struct ibmveth_adapter *adapter) +{ + if(adapter->buffer_list_addr != NULL) { + if(!dma_mapping_error(adapter->buffer_list_dma)) { + dma_unmap_single(&adapter->vdev->dev, + adapter->buffer_list_dma, 4096, + DMA_BIDIRECTIONAL); + adapter->buffer_list_dma = DMA_ERROR_CODE; + } + free_page((unsigned long)adapter->buffer_list_addr); + adapter->buffer_list_addr = NULL; + } + + if(adapter->filter_list_addr != NULL) { + if(!dma_mapping_error(adapter->filter_list_dma)) { + dma_unmap_single(&adapter->vdev->dev, + adapter->filter_list_dma, 4096, + DMA_BIDIRECTIONAL); + adapter->filter_list_dma = DMA_ERROR_CODE; + } + free_page((unsigned long)adapter->filter_list_addr); + adapter->filter_list_addr = NULL; + } + + if(adapter->rx_queue.queue_addr != NULL) { + if(!dma_mapping_error(adapter->rx_queue.queue_dma)) { + dma_unmap_single(&adapter->vdev->dev, + adapter->rx_queue.queue_dma, + adapter->rx_queue.queue_len, + DMA_BIDIRECTIONAL); + adapter->rx_queue.queue_dma = DMA_ERROR_CODE; + } + kfree(adapter->rx_queue.queue_addr); + adapter->rx_queue.queue_addr = NULL; + } + + ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[0]); + ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[1]); + ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[2]); +} + +static int ibmveth_open(struct net_device *netdev) +{ + struct ibmveth_adapter *adapter = netdev->priv; + u64 mac_address = 0; + int rxq_entries; + unsigned long lpar_rc; + int rc; + union ibmveth_buf_desc rxq_desc; + + ibmveth_debug_printk("open starting\n"); + + rxq_entries = + adapter->rx_buff_pool[0].size + + adapter->rx_buff_pool[1].size + + adapter->rx_buff_pool[2].size + 1; + + adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL); + adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL); + + if(!adapter->buffer_list_addr || !adapter->filter_list_addr) { + ibmveth_error_printk("unable to allocate filter or buffer list pages\n"); + ibmveth_cleanup(adapter); + return -ENOMEM; + } + + adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * rxq_entries; + adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len, GFP_KERNEL); + + if(!adapter->rx_queue.queue_addr) { + ibmveth_error_printk("unable to allocate rx queue pages\n"); + ibmveth_cleanup(adapter); + return -ENOMEM; + } + + adapter->buffer_list_dma = dma_map_single(&adapter->vdev->dev, + adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL); + adapter->filter_list_dma = dma_map_single(&adapter->vdev->dev, + adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL); + adapter->rx_queue.queue_dma = dma_map_single(&adapter->vdev->dev, + adapter->rx_queue.queue_addr, + adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL); + + if((dma_mapping_error(adapter->buffer_list_dma) ) || + (dma_mapping_error(adapter->filter_list_dma)) || + (dma_mapping_error(adapter->rx_queue.queue_dma))) { + ibmveth_error_printk("unable to map filter or buffer list pages\n"); + ibmveth_cleanup(adapter); + return -ENOMEM; + } + + adapter->rx_queue.index = 0; + adapter->rx_queue.num_slots = rxq_entries; + adapter->rx_queue.toggle = 1; + + if(ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[0]) || + ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[1]) || + ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[2])) + { + ibmveth_error_printk("unable to allocate buffer pools\n"); + ibmveth_cleanup(adapter); + return -ENOMEM; + } + + memcpy(&mac_address, netdev->dev_addr, netdev->addr_len); + mac_address = mac_address >> 16; + + rxq_desc.desc = 0; + rxq_desc.fields.valid = 1; + rxq_desc.fields.length = adapter->rx_queue.queue_len; + rxq_desc.fields.address = adapter->rx_queue.queue_dma; + + ibmveth_debug_printk("buffer list @ 0x%p\n", adapter->buffer_list_addr); + ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr); + ibmveth_debug_printk("receive q @ 0x%p\n", adapter->rx_queue.queue_addr); + + + lpar_rc = h_register_logical_lan(adapter->vdev->unit_address, + adapter->buffer_list_dma, + rxq_desc.desc, + adapter->filter_list_dma, + mac_address); + + if(lpar_rc != H_Success) { + ibmveth_error_printk("h_register_logical_lan failed with %ld\n", lpar_rc); + ibmveth_error_printk("buffer TCE:0x%x filter TCE:0x%x rxq desc:0x%lx MAC:0x%lx\n", + adapter->buffer_list_dma, + adapter->filter_list_dma, + rxq_desc.desc, + mac_address); + ibmveth_cleanup(adapter); + return -ENONET; + } + + ibmveth_debug_printk("registering irq 0x%x\n", netdev->irq); + if((rc = request_irq(netdev->irq, &ibmveth_interrupt, 0, netdev->name, netdev)) != 0) { + ibmveth_error_printk("unable to request irq 0x%x, rc %d\n", netdev->irq, rc); + do { + rc = h_free_logical_lan(adapter->vdev->unit_address); + } while (H_isLongBusy(rc) || (rc == H_Busy)); + + ibmveth_cleanup(adapter); + return rc; + } + + netif_start_queue(netdev); + + ibmveth_debug_printk("scheduling initial replenish cycle\n"); + ibmveth_schedule_replenishing(adapter); + + ibmveth_debug_printk("open complete\n"); + + return 0; +} + +static int ibmveth_close(struct net_device *netdev) +{ + struct ibmveth_adapter *adapter = netdev->priv; + long lpar_rc; + + ibmveth_debug_printk("close starting\n"); + + netif_stop_queue(netdev); + + free_irq(netdev->irq, netdev); + + cancel_delayed_work(&adapter->replenish_task); + flush_scheduled_work(); + + do { + lpar_rc = h_free_logical_lan(adapter->vdev->unit_address); + } while (H_isLongBusy(lpar_rc) || (lpar_rc == H_Busy)); + + if(lpar_rc != H_Success) + { + ibmveth_error_printk("h_free_logical_lan failed with %lx, continuing with close\n", + lpar_rc); + } + + adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8); + + ibmveth_cleanup(adapter); + + ibmveth_debug_printk("close complete\n"); + + return 0; +} + +static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) { + cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE); + cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | ADVERTISED_FIBRE); + cmd->speed = SPEED_1000; + cmd->duplex = DUPLEX_FULL; + cmd->port = PORT_FIBRE; + cmd->phy_address = 0; + cmd->transceiver = XCVR_INTERNAL; + cmd->autoneg = AUTONEG_ENABLE; + cmd->maxtxpkt = 0; + cmd->maxrxpkt = 1; + return 0; +} + +static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info) { + strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1); + strncpy(info->version, ibmveth_driver_version, sizeof(info->version) - 1); +} + +static u32 netdev_get_link(struct net_device *dev) { + return 1; +} + +static struct ethtool_ops netdev_ethtool_ops = { + .get_drvinfo = netdev_get_drvinfo, + .get_settings = netdev_get_settings, + .get_link = netdev_get_link, + .get_sg = ethtool_op_get_sg, + .get_tx_csum = ethtool_op_get_tx_csum, +}; + +static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + return -EOPNOTSUPP; +} + +#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1)) + +static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev) +{ + struct ibmveth_adapter *adapter = netdev->priv; + union ibmveth_buf_desc desc[IbmVethMaxSendFrags]; + unsigned long lpar_rc; + int nfrags = 0, curfrag; + unsigned long correlator; + unsigned int retry_count; + + if ((skb_shinfo(skb)->nr_frags + 1) > IbmVethMaxSendFrags) { + adapter->stats.tx_dropped++; + dev_kfree_skb(skb); + return 0; + } + + memset(&desc, 0, sizeof(desc)); + + /* nfrags = number of frags after the initial fragment */ + nfrags = skb_shinfo(skb)->nr_frags; + + if(nfrags) + adapter->tx_multidesc_send++; + + /* map the initial fragment */ + desc[0].fields.length = nfrags ? skb->len - skb->data_len : skb->len; + desc[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data, + desc[0].fields.length, DMA_TO_DEVICE); + desc[0].fields.valid = 1; + + if(dma_mapping_error(desc[0].fields.address)) { + ibmveth_error_printk("tx: unable to map initial fragment\n"); + adapter->tx_map_failed++; + adapter->stats.tx_dropped++; + dev_kfree_skb(skb); + return 0; + } + + curfrag = nfrags; + + /* map fragments past the initial portion if there are any */ + while(curfrag--) { + skb_frag_t *frag = &skb_shinfo(skb)->frags[curfrag]; + desc[curfrag+1].fields.address + = dma_map_single(&adapter->vdev->dev, + page_address(frag->page) + frag->page_offset, + frag->size, DMA_TO_DEVICE); + desc[curfrag+1].fields.length = frag->size; + desc[curfrag+1].fields.valid = 1; + + if(dma_mapping_error(desc[curfrag+1].fields.address)) { + ibmveth_error_printk("tx: unable to map fragment %d\n", curfrag); + adapter->tx_map_failed++; + adapter->stats.tx_dropped++; + /* Free all the mappings we just created */ + while(curfrag < nfrags) { + dma_unmap_single(&adapter->vdev->dev, + desc[curfrag+1].fields.address, + desc[curfrag+1].fields.length, + DMA_TO_DEVICE); + curfrag++; + } + dev_kfree_skb(skb); + return 0; + } + } + + /* send the frame. Arbitrarily set retrycount to 1024 */ + correlator = 0; + retry_count = 1024; + do { + lpar_rc = h_send_logical_lan(adapter->vdev->unit_address, + desc[0].desc, + desc[1].desc, + desc[2].desc, + desc[3].desc, + desc[4].desc, + desc[5].desc, + correlator); + } while ((lpar_rc == H_Busy) && (retry_count--)); + + if(lpar_rc != H_Success && lpar_rc != H_Dropped) { + int i; + ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc); + for(i = 0; i < 6; i++) { + ibmveth_error_printk("tx: desc[%i] valid=%d, len=%d, address=0x%d\n", i, + desc[i].fields.valid, desc[i].fields.length, desc[i].fields.address); + } + adapter->tx_send_failed++; + adapter->stats.tx_dropped++; + } else { + adapter->stats.tx_packets++; + adapter->stats.tx_bytes += skb->len; + } + + do { + dma_unmap_single(&adapter->vdev->dev, + desc[nfrags].fields.address, + desc[nfrags].fields.length, DMA_TO_DEVICE); + } while(--nfrags >= 0); + + dev_kfree_skb(skb); + return 0; +} + +static int ibmveth_poll(struct net_device *netdev, int *budget) +{ + struct ibmveth_adapter *adapter = netdev->priv; + int max_frames_to_process = netdev->quota; + int frames_processed = 0; + int more_work = 1; + unsigned long lpar_rc; + + restart_poll: + do { + struct net_device *netdev = adapter->netdev; + + if(ibmveth_rxq_pending_buffer(adapter)) { + struct sk_buff *skb; + + rmb(); + + if(!ibmveth_rxq_buffer_valid(adapter)) { + wmb(); /* suggested by larson1 */ + adapter->rx_invalid_buffer++; + ibmveth_debug_printk("recycling invalid buffer\n"); + ibmveth_rxq_recycle_buffer(adapter); + } else { + int length = ibmveth_rxq_frame_length(adapter); + int offset = ibmveth_rxq_frame_offset(adapter); + skb = ibmveth_rxq_get_buffer(adapter); + + ibmveth_rxq_harvest_buffer(adapter); + + skb_reserve(skb, offset); + skb_put(skb, length); + skb->dev = netdev; + skb->protocol = eth_type_trans(skb, netdev); + + netif_receive_skb(skb); /* send it up */ + + adapter->stats.rx_packets++; + adapter->stats.rx_bytes += length; + frames_processed++; + } + } else { + more_work = 0; + } + } while(more_work && (frames_processed < max_frames_to_process)); + + ibmveth_schedule_replenishing(adapter); + + if(more_work) { + /* more work to do - return that we are not done yet */ + netdev->quota -= frames_processed; + *budget -= frames_processed; + return 1; + } + + /* we think we are done - reenable interrupts, then check once more to make sure we are done */ + lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_ENABLE); + + ibmveth_assert(lpar_rc == H_Success); + + netif_rx_complete(netdev); + + if(ibmveth_rxq_pending_buffer(adapter) && netif_rx_reschedule(netdev, frames_processed)) + { + lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); + ibmveth_assert(lpar_rc == H_Success); + more_work = 1; + goto restart_poll; + } + + netdev->quota -= frames_processed; + *budget -= frames_processed; + + /* we really are done */ + return 0; +} + +static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs) +{ + struct net_device *netdev = dev_instance; + struct ibmveth_adapter *adapter = netdev->priv; + unsigned long lpar_rc; + + if(netif_rx_schedule_prep(netdev)) { + lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE); + ibmveth_assert(lpar_rc == H_Success); + __netif_rx_schedule(netdev); + } + return IRQ_HANDLED; +} + +static struct net_device_stats *ibmveth_get_stats(struct net_device *dev) +{ + struct ibmveth_adapter *adapter = dev->priv; + return &adapter->stats; +} + +static void ibmveth_set_multicast_list(struct net_device *netdev) +{ + struct ibmveth_adapter *adapter = netdev->priv; + unsigned long lpar_rc; + + if((netdev->flags & IFF_PROMISC) || (netdev->mc_count > adapter->mcastFilterSize)) { + lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, + IbmVethMcastEnableRecv | + IbmVethMcastDisableFiltering, + 0); + if(lpar_rc != H_Success) { + ibmveth_error_printk("h_multicast_ctrl rc=%ld when entering promisc mode\n", lpar_rc); + } + } else { + struct dev_mc_list *mclist = netdev->mc_list; + int i; + /* clear the filter table & disable filtering */ + lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, + IbmVethMcastEnableRecv | + IbmVethMcastDisableFiltering | + IbmVethMcastClearFilterTable, + 0); + if(lpar_rc != H_Success) { + ibmveth_error_printk("h_multicast_ctrl rc=%ld when attempting to clear filter table\n", lpar_rc); + } + /* add the addresses to the filter table */ + for(i = 0; i < netdev->mc_count; ++i, mclist = mclist->next) { + // add the multicast address to the filter table + unsigned long mcast_addr = 0; + memcpy(((char *)&mcast_addr)+2, mclist->dmi_addr, 6); + lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, + IbmVethMcastAddFilter, + mcast_addr); + if(lpar_rc != H_Success) { + ibmveth_error_printk("h_multicast_ctrl rc=%ld when adding an entry to the filter table\n", lpar_rc); + } + } + + /* re-enable filtering */ + lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address, + IbmVethMcastEnableFiltering, + 0); + if(lpar_rc != H_Success) { + ibmveth_error_printk("h_multicast_ctrl rc=%ld when enabling filtering\n", lpar_rc); + } + } +} + +static int ibmveth_change_mtu(struct net_device *dev, int new_mtu) +{ + if ((new_mtu < 68) || (new_mtu > (1<<20))) + return -EINVAL; + dev->mtu = new_mtu; + return 0; +} + +static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id) +{ + int rc; + struct net_device *netdev; + struct ibmveth_adapter *adapter; + + unsigned char *mac_addr_p; + unsigned int *mcastFilterSize_p; + + + ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n", + dev->unit_address); + + mac_addr_p = (unsigned char *) vio_get_attribute(dev, VETH_MAC_ADDR, 0); + if(!mac_addr_p) { + printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find VETH_MAC_ADDR " + "attribute\n", __FILE__, __LINE__); + return 0; + } + + mcastFilterSize_p= (unsigned int *) vio_get_attribute(dev, VETH_MCAST_FILTER_SIZE, 0); + if(!mcastFilterSize_p) { + printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find " + "VETH_MCAST_FILTER_SIZE attribute\n", + __FILE__, __LINE__); + return 0; + } + + netdev = alloc_etherdev(sizeof(struct ibmveth_adapter)); + + if(!netdev) + return -ENOMEM; + + SET_MODULE_OWNER(netdev); + + adapter = netdev->priv; + memset(adapter, 0, sizeof(adapter)); + dev->dev.driver_data = netdev; + + adapter->vdev = dev; + adapter->netdev = netdev; + adapter->mcastFilterSize= *mcastFilterSize_p; + + /* Some older boxes running PHYP non-natively have an OF that + returns a 8-byte local-mac-address field (and the first + 2 bytes have to be ignored) while newer boxes' OF return + a 6-byte field. Note that IEEE 1275 specifies that + local-mac-address must be a 6-byte field. + The RPA doc specifies that the first byte must be 10b, so + we'll just look for it to solve this 8 vs. 6 byte field issue */ + + if ((*mac_addr_p & 0x3) != 0x02) + mac_addr_p += 2; + + adapter->mac_addr = 0; + memcpy(&adapter->mac_addr, mac_addr_p, 6); + + adapter->liobn = dev->iommu_table->it_index; + + netdev->irq = dev->irq; + netdev->open = ibmveth_open; + netdev->poll = ibmveth_poll; + netdev->weight = 16; + netdev->stop = ibmveth_close; + netdev->hard_start_xmit = ibmveth_start_xmit; + netdev->get_stats = ibmveth_get_stats; + netdev->set_multicast_list = ibmveth_set_multicast_list; + netdev->do_ioctl = ibmveth_ioctl; + netdev->ethtool_ops = &netdev_ethtool_ops; + netdev->change_mtu = ibmveth_change_mtu; + SET_NETDEV_DEV(netdev, &dev->dev); + + memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len); + + ibmveth_init_buffer_pool(&adapter->rx_buff_pool[0], 0, IbmVethPool0DftCnt, IbmVethPool0DftSize); + ibmveth_init_buffer_pool(&adapter->rx_buff_pool[1], 1, IbmVethPool1DftCnt, IbmVethPool1DftSize); + ibmveth_init_buffer_pool(&adapter->rx_buff_pool[2], 2, IbmVethPool2DftCnt, IbmVethPool2DftSize); + + ibmveth_debug_printk("adapter @ 0x%p\n", adapter); + + INIT_WORK(&adapter->replenish_task, (void*)ibmveth_replenish_task, (void*)adapter); + + adapter->buffer_list_dma = DMA_ERROR_CODE; + adapter->filter_list_dma = DMA_ERROR_CODE; + adapter->rx_queue.queue_dma = DMA_ERROR_CODE; + + atomic_set(&adapter->not_replenishing, 1); + + ibmveth_debug_printk("registering netdev...\n"); + + rc = register_netdev(netdev); + + if(rc) { + ibmveth_debug_printk("failed to register netdev rc=%d\n", rc); + free_netdev(netdev); + return rc; + } + + ibmveth_debug_printk("registered\n"); + + ibmveth_proc_register_adapter(adapter); + + return 0; +} + +static int __devexit ibmveth_remove(struct vio_dev *dev) +{ + struct net_device *netdev = dev->dev.driver_data; + struct ibmveth_adapter *adapter = netdev->priv; + + unregister_netdev(netdev); + + ibmveth_proc_unregister_adapter(adapter); + + free_netdev(netdev); + return 0; +} + +#ifdef CONFIG_PROC_FS +static void ibmveth_proc_register_driver(void) +{ + ibmveth_proc_dir = create_proc_entry(IBMVETH_PROC_DIR, S_IFDIR, proc_net); + if (ibmveth_proc_dir) { + SET_MODULE_OWNER(ibmveth_proc_dir); + } +} + +static void ibmveth_proc_unregister_driver(void) +{ + remove_proc_entry(IBMVETH_PROC_DIR, proc_net); +} + +static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos) +{ + if (*pos == 0) { + return (void *)1; + } else { + return NULL; + } +} + +static void *ibmveth_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + ++*pos; + return NULL; +} + +static void ibmveth_seq_stop(struct seq_file *seq, void *v) +{ +} + +static int ibmveth_seq_show(struct seq_file *seq, void *v) +{ + struct ibmveth_adapter *adapter = seq->private; + char *current_mac = ((char*) &adapter->netdev->dev_addr); + char *firmware_mac = ((char*) &adapter->mac_addr) ; + + seq_printf(seq, "%s %s\n\n", ibmveth_driver_string, ibmveth_driver_version); + + seq_printf(seq, "Unit Address: 0x%x\n", adapter->vdev->unit_address); + seq_printf(seq, "LIOBN: 0x%lx\n", adapter->liobn); + seq_printf(seq, "Current MAC: %02X:%02X:%02X:%02X:%02X:%02X\n", + current_mac[0], current_mac[1], current_mac[2], + current_mac[3], current_mac[4], current_mac[5]); + seq_printf(seq, "Firmware MAC: %02X:%02X:%02X:%02X:%02X:%02X\n", + firmware_mac[0], firmware_mac[1], firmware_mac[2], + firmware_mac[3], firmware_mac[4], firmware_mac[5]); + + seq_printf(seq, "\nAdapter Statistics:\n"); + seq_printf(seq, " TX: skbuffs linearized: %ld\n", adapter->tx_linearized); + seq_printf(seq, " multi-descriptor sends: %ld\n", adapter->tx_multidesc_send); + seq_printf(seq, " skb_linearize failures: %ld\n", adapter->tx_linearize_failed); + seq_printf(seq, " vio_map_single failres: %ld\n", adapter->tx_map_failed); + seq_printf(seq, " send failures: %ld\n", adapter->tx_send_failed); + seq_printf(seq, " RX: replenish task cycles: %ld\n", adapter->replenish_task_cycles); + seq_printf(seq, " alloc_skb_failures: %ld\n", adapter->replenish_no_mem); + seq_printf(seq, " add buffer failures: %ld\n", adapter->replenish_add_buff_failure); + seq_printf(seq, " invalid buffers: %ld\n", adapter->rx_invalid_buffer); + seq_printf(seq, " no buffers: %ld\n", adapter->rx_no_buffer); + + return 0; +} +static struct seq_operations ibmveth_seq_ops = { + .start = ibmveth_seq_start, + .next = ibmveth_seq_next, + .stop = ibmveth_seq_stop, + .show = ibmveth_seq_show, +}; + +static int ibmveth_proc_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + struct proc_dir_entry *proc; + int rc; + + rc = seq_open(file, &ibmveth_seq_ops); + if (!rc) { + /* recover the pointer buried in proc_dir_entry data */ + seq = file->private_data; + proc = PDE(inode); + seq->private = proc->data; + } + return rc; +} + +static struct file_operations ibmveth_proc_fops = { + .owner = THIS_MODULE, + .open = ibmveth_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter) +{ + struct proc_dir_entry *entry; + if (ibmveth_proc_dir) { + entry = create_proc_entry(adapter->netdev->name, S_IFREG, ibmveth_proc_dir); + if (!entry) { + ibmveth_error_printk("Cannot create adapter proc entry"); + } else { + entry->data = (void *) adapter; + entry->proc_fops = &ibmveth_proc_fops; + SET_MODULE_OWNER(entry); + } + } + return; +} + +static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter) +{ + if (ibmveth_proc_dir) { + remove_proc_entry(adapter->netdev->name, ibmveth_proc_dir); + } +} + +#else /* CONFIG_PROC_FS */ +static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter) +{ +} + +static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter) +{ +} +static void ibmveth_proc_register_driver(void) +{ +} + +static void ibmveth_proc_unregister_driver(void) +{ +} +#endif /* CONFIG_PROC_FS */ + +static struct vio_device_id ibmveth_device_table[] __devinitdata= { + { "network", "IBM,l-lan"}, + { 0,} +}; + +MODULE_DEVICE_TABLE(vio, ibmveth_device_table); + +static struct vio_driver ibmveth_driver = { + .name = (char *)ibmveth_driver_name, + .id_table = ibmveth_device_table, + .probe = ibmveth_probe, + .remove = ibmveth_remove +}; + +static int __init ibmveth_module_init(void) +{ + ibmveth_printk("%s: %s %s\n", ibmveth_driver_name, ibmveth_driver_string, ibmveth_driver_version); + + ibmveth_proc_register_driver(); + + return vio_register_driver(&ibmveth_driver); +} + +static void __exit ibmveth_module_exit(void) +{ + vio_unregister_driver(&ibmveth_driver); + ibmveth_proc_unregister_driver(); +} + +module_init(ibmveth_module_init); +module_exit(ibmveth_module_exit); |