diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/wireless/prism54/islpci_eth.c | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/net/wireless/prism54/islpci_eth.c')
-rw-r--r-- | drivers/net/wireless/prism54/islpci_eth.c | 519 |
1 files changed, 519 insertions, 0 deletions
diff --git a/drivers/net/wireless/prism54/islpci_eth.c b/drivers/net/wireless/prism54/islpci_eth.c new file mode 100644 index 0000000..5952e996 --- /dev/null +++ b/drivers/net/wireless/prism54/islpci_eth.c @@ -0,0 +1,519 @@ +/* + * + * Copyright (C) 2002 Intersil Americas Inc. + * Copyright (C) 2004 Aurelien Alleaume <slts@free.fr> + * 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 + * + * 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 + * + */ + +#include <linux/version.h> +#include <linux/module.h> + +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/if_arp.h> + +#include "prismcompat.h" +#include "isl_38xx.h" +#include "islpci_eth.h" +#include "islpci_mgt.h" +#include "oid_mgt.h" + +/****************************************************************************** + Network Interface functions +******************************************************************************/ +void +islpci_eth_cleanup_transmit(islpci_private *priv, + isl38xx_control_block *control_block) +{ + struct sk_buff *skb; + u32 index; + + /* compare the control block read pointer with the free pointer */ + while (priv->free_data_tx != + le32_to_cpu(control_block-> + device_curr_frag[ISL38XX_CB_TX_DATA_LQ])) { + /* read the index of the first fragment to be freed */ + index = priv->free_data_tx % ISL38XX_CB_TX_QSIZE; + + /* check for holes in the arrays caused by multi fragment frames + * searching for the last fragment of a frame */ + if (priv->pci_map_tx_address[index] != (dma_addr_t) NULL) { + /* entry is the last fragment of a frame + * free the skb structure and unmap pci memory */ + skb = priv->data_low_tx[index]; + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_TRACING, + "cleanup skb %p skb->data %p skb->len %u truesize %u\n ", + skb, skb->data, skb->len, skb->truesize); +#endif + + pci_unmap_single(priv->pdev, + priv->pci_map_tx_address[index], + skb->len, PCI_DMA_TODEVICE); + dev_kfree_skb_irq(skb); + skb = NULL; + } + /* increment the free data low queue pointer */ + priv->free_data_tx++; + } +} + +int +islpci_eth_transmit(struct sk_buff *skb, struct net_device *ndev) +{ + islpci_private *priv = netdev_priv(ndev); + isl38xx_control_block *cb = priv->control_block; + u32 index; + dma_addr_t pci_map_address; + int frame_size; + isl38xx_fragment *fragment; + int offset; + struct sk_buff *newskb; + int newskb_offset; + unsigned long flags; + unsigned char wds_mac[6]; + u32 curr_frag; + int err = 0; + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_transmit \n"); +#endif + + /* lock the driver code */ + spin_lock_irqsave(&priv->slock, flags); + + /* determine the amount of fragments needed to store the frame */ + + frame_size = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len; + if (init_wds) + frame_size += 6; + + /* check whether the destination queue has enough fragments for the frame */ + curr_frag = le32_to_cpu(cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ]); + if (unlikely(curr_frag - priv->free_data_tx >= ISL38XX_CB_TX_QSIZE)) { + printk(KERN_ERR "%s: transmit device queue full when awake\n", + ndev->name); + netif_stop_queue(ndev); + + /* trigger the device */ + isl38xx_w32_flush(priv->device_base, ISL38XX_DEV_INT_UPDATE, + ISL38XX_DEV_INT_REG); + udelay(ISL38XX_WRITEIO_DELAY); + + err = -EBUSY; + goto drop_free; + } + /* Check alignment and WDS frame formatting. The start of the packet should + * be aligned on a 4-byte boundary. If WDS is enabled add another 6 bytes + * and add WDS address information */ + if (likely(((long) skb->data & 0x03) | init_wds)) { + /* get the number of bytes to add and re-allign */ + offset = (4 - (long) skb->data) & 0x03; + offset += init_wds ? 6 : 0; + + /* check whether the current skb can be used */ + if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) { + unsigned char *src = skb->data; + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_TRACING, "skb offset %i wds %i\n", offset, + init_wds); +#endif + + /* align the buffer on 4-byte boundary */ + skb_reserve(skb, (4 - (long) skb->data) & 0x03); + if (init_wds) { + /* wds requires an additional address field of 6 bytes */ + skb_put(skb, 6); +#ifdef ISLPCI_ETH_DEBUG + printk("islpci_eth_transmit:wds_mac\n"); +#endif + memmove(skb->data + 6, src, skb->len); + memcpy(skb->data, wds_mac, 6); + } else { + memmove(skb->data, src, skb->len); + } + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_TRACING, "memmove %p %p %i \n", skb->data, + src, skb->len); +#endif + } else { + newskb = + dev_alloc_skb(init_wds ? skb->len + 6 : skb->len); + if (unlikely(newskb == NULL)) { + printk(KERN_ERR "%s: Cannot allocate skb\n", + ndev->name); + err = -ENOMEM; + goto drop_free; + } + newskb_offset = (4 - (long) newskb->data) & 0x03; + + /* Check if newskb->data is aligned */ + if (newskb_offset) + skb_reserve(newskb, newskb_offset); + + skb_put(newskb, init_wds ? skb->len + 6 : skb->len); + if (init_wds) { + memcpy(newskb->data + 6, skb->data, skb->len); + memcpy(newskb->data, wds_mac, 6); +#ifdef ISLPCI_ETH_DEBUG + printk("islpci_eth_transmit:wds_mac\n"); +#endif + } else + memcpy(newskb->data, skb->data, skb->len); + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_TRACING, "memcpy %p %p %i wds %i\n", + newskb->data, skb->data, skb->len, init_wds); +#endif + + newskb->dev = skb->dev; + dev_kfree_skb(skb); + skb = newskb; + } + } + /* display the buffer contents for debugging */ +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_BUFFER_CONTENTS, "\ntx %p ", skb->data); + display_buffer((char *) skb->data, skb->len); +#endif + + /* map the skb buffer to pci memory for DMA operation */ + pci_map_address = pci_map_single(priv->pdev, + (void *) skb->data, skb->len, + PCI_DMA_TODEVICE); + if (unlikely(pci_map_address == 0)) { + printk(KERN_WARNING "%s: cannot map buffer to PCI\n", + ndev->name); + + err = -EIO; + goto drop_free; + } + /* Place the fragment in the control block structure. */ + index = curr_frag % ISL38XX_CB_TX_QSIZE; + fragment = &cb->tx_data_low[index]; + + priv->pci_map_tx_address[index] = pci_map_address; + /* store the skb address for future freeing */ + priv->data_low_tx[index] = skb; + /* set the proper fragment start address and size information */ + fragment->size = cpu_to_le16(frame_size); + fragment->flags = cpu_to_le16(0); /* set to 1 if more fragments */ + fragment->address = cpu_to_le32(pci_map_address); + curr_frag++; + + /* The fragment address in the control block must have been + * written before announcing the frame buffer to device. */ + wmb(); + cb->driver_curr_frag[ISL38XX_CB_TX_DATA_LQ] = cpu_to_le32(curr_frag); + + if (curr_frag - priv->free_data_tx + ISL38XX_MIN_QTHRESHOLD + > ISL38XX_CB_TX_QSIZE) { + /* stop sends from upper layers */ + netif_stop_queue(ndev); + + /* set the full flag for the transmission queue */ + priv->data_low_tx_full = 1; + } + + /* trigger the device */ + islpci_trigger(priv); + + /* unlock the driver code */ + spin_unlock_irqrestore(&priv->slock, flags); + + /* set the transmission time */ + ndev->trans_start = jiffies; + priv->statistics.tx_packets++; + priv->statistics.tx_bytes += skb->len; + + return 0; + + drop_free: + /* free the skbuf structure before aborting */ + dev_kfree_skb(skb); + skb = NULL; + + priv->statistics.tx_dropped++; + spin_unlock_irqrestore(&priv->slock, flags); + return err; +} + +static inline int +islpci_monitor_rx(islpci_private *priv, struct sk_buff **skb) +{ + /* The card reports full 802.11 packets but with a 20 bytes + * header and without the FCS. But there a is a bit that + * indicates if the packet is corrupted :-) */ + struct rfmon_header *hdr = (struct rfmon_header *) (*skb)->data; + if (hdr->flags & 0x01) + /* This one is bad. Drop it ! */ + return -1; + if (priv->ndev->type == ARPHRD_IEEE80211_PRISM) { + struct avs_80211_1_header *avs; + /* extract the relevant data from the header */ + u32 clock = le32_to_cpu(hdr->clock); + u8 rate = hdr->rate; + u16 freq = le16_to_cpu(hdr->freq); + u8 rssi = hdr->rssi; + + skb_pull(*skb, sizeof (struct rfmon_header)); + + if (skb_headroom(*skb) < sizeof (struct avs_80211_1_header)) { + struct sk_buff *newskb = skb_copy_expand(*skb, + sizeof (struct + avs_80211_1_header), + 0, GFP_ATOMIC); + if (newskb) { + dev_kfree_skb_irq(*skb); + *skb = newskb; + } else + return -1; + /* This behavior is not very subtile... */ + } + + /* make room for the new header and fill it. */ + avs = + (struct avs_80211_1_header *) skb_push(*skb, + sizeof (struct + avs_80211_1_header)); + + avs->version = cpu_to_be32(P80211CAPTURE_VERSION); + avs->length = cpu_to_be32(sizeof (struct avs_80211_1_header)); + avs->mactime = cpu_to_be64(le64_to_cpu(clock)); + avs->hosttime = cpu_to_be64(jiffies); + avs->phytype = cpu_to_be32(6); /*OFDM: 6 for (g), 8 for (a) */ + avs->channel = cpu_to_be32(channel_of_freq(freq)); + avs->datarate = cpu_to_be32(rate * 5); + avs->antenna = cpu_to_be32(0); /*unknown */ + avs->priority = cpu_to_be32(0); /*unknown */ + avs->ssi_type = cpu_to_be32(3); /*2: dBm, 3: raw RSSI */ + avs->ssi_signal = cpu_to_be32(rssi & 0x7f); + avs->ssi_noise = cpu_to_be32(priv->local_iwstatistics.qual.noise); /*better than 'undefined', I assume */ + avs->preamble = cpu_to_be32(0); /*unknown */ + avs->encoding = cpu_to_be32(0); /*unknown */ + } else + skb_pull(*skb, sizeof (struct rfmon_header)); + + (*skb)->protocol = htons(ETH_P_802_2); + (*skb)->mac.raw = (*skb)->data; + (*skb)->pkt_type = PACKET_OTHERHOST; + + return 0; +} + +int +islpci_eth_receive(islpci_private *priv) +{ + struct net_device *ndev = priv->ndev; + isl38xx_control_block *control_block = priv->control_block; + struct sk_buff *skb; + u16 size; + u32 index, offset; + unsigned char *src; + int discard = 0; + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_FUNCTION_CALLS, "islpci_eth_receive \n"); +#endif + + /* the device has written an Ethernet frame in the data area + * of the sk_buff without updating the structure, do it now */ + index = priv->free_data_rx % ISL38XX_CB_RX_QSIZE; + size = le16_to_cpu(control_block->rx_data_low[index].size); + skb = priv->data_low_rx[index]; + offset = ((unsigned long) + le32_to_cpu(control_block->rx_data_low[index].address) - + (unsigned long) skb->data) & 3; + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_TRACING, + "frq->addr %x skb->data %p skb->len %u offset %u truesize %u\n ", + control_block->rx_data_low[priv->free_data_rx].address, skb->data, + skb->len, offset, skb->truesize); +#endif + + /* delete the streaming DMA mapping before processing the skb */ + pci_unmap_single(priv->pdev, + priv->pci_map_rx_address[index], + MAX_FRAGMENT_SIZE_RX + 2, PCI_DMA_FROMDEVICE); + + /* update the skb structure and allign the buffer */ + skb_put(skb, size); + if (offset) { + /* shift the buffer allocation offset bytes to get the right frame */ + skb_pull(skb, 2); + skb_put(skb, 2); + } +#if VERBOSE > SHOW_ERROR_MESSAGES + /* display the buffer contents for debugging */ + DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data); + display_buffer((char *) skb->data, skb->len); +#endif + + /* check whether WDS is enabled and whether the data frame is a WDS frame */ + + if (init_wds) { + /* WDS enabled, check for the wds address on the first 6 bytes of the buffer */ + src = skb->data + 6; + memmove(skb->data, src, skb->len - 6); + skb_trim(skb, skb->len - 6); + } +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_TRACING, "Fragment size %i in skb at %p\n", size, skb); + DEBUG(SHOW_TRACING, "Skb data at %p, length %i\n", skb->data, skb->len); + + /* display the buffer contents for debugging */ + DEBUG(SHOW_BUFFER_CONTENTS, "\nrx %p ", skb->data); + display_buffer((char *) skb->data, skb->len); +#endif + + /* do some additional sk_buff and network layer parameters */ + skb->dev = ndev; + + /* take care of monitor mode and spy monitoring. */ + if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) + discard = islpci_monitor_rx(priv, &skb); + else { + if (unlikely(skb->data[2 * ETH_ALEN] == 0)) { + /* The packet has a rx_annex. Read it for spy monitoring, Then + * remove it, while keeping the 2 leading MAC addr. + */ + struct iw_quality wstats; + struct rx_annex_header *annex = + (struct rx_annex_header *) skb->data; + wstats.level = annex->rfmon.rssi; + /* The noise value can be a bit outdated if nobody's + * reading wireless stats... */ + wstats.noise = priv->local_iwstatistics.qual.noise; + wstats.qual = wstats.level - wstats.noise; + wstats.updated = 0x07; + /* Update spy records */ + wireless_spy_update(ndev, annex->addr2, &wstats); + + memcpy(skb->data + sizeof (struct rfmon_header), + skb->data, 2 * ETH_ALEN); + skb_pull(skb, sizeof (struct rfmon_header)); + } + skb->protocol = eth_type_trans(skb, ndev); + } + skb->ip_summed = CHECKSUM_NONE; + priv->statistics.rx_packets++; + priv->statistics.rx_bytes += size; + + /* deliver the skb to the network layer */ +#ifdef ISLPCI_ETH_DEBUG + printk + ("islpci_eth_receive:netif_rx %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", + skb->data[0], skb->data[1], skb->data[2], skb->data[3], + skb->data[4], skb->data[5]); +#endif + if (unlikely(discard)) { + dev_kfree_skb_irq(skb); + skb = NULL; + } else + netif_rx(skb); + + /* increment the read index for the rx data low queue */ + priv->free_data_rx++; + + /* add one or more sk_buff structures */ + while (index = + le32_to_cpu(control_block-> + driver_curr_frag[ISL38XX_CB_RX_DATA_LQ]), + index - priv->free_data_rx < ISL38XX_CB_RX_QSIZE) { + /* allocate an sk_buff for received data frames storage + * include any required allignment operations */ + skb = dev_alloc_skb(MAX_FRAGMENT_SIZE_RX + 2); + if (unlikely(skb == NULL)) { + /* error allocating an sk_buff structure elements */ + DEBUG(SHOW_ERROR_MESSAGES, "Error allocating skb \n"); + break; + } + skb_reserve(skb, (4 - (long) skb->data) & 0x03); + /* store the new skb structure pointer */ + index = index % ISL38XX_CB_RX_QSIZE; + priv->data_low_rx[index] = skb; + +#if VERBOSE > SHOW_ERROR_MESSAGES + DEBUG(SHOW_TRACING, + "new alloc skb %p skb->data %p skb->len %u index %u truesize %u\n ", + skb, skb->data, skb->len, index, skb->truesize); +#endif + + /* set the streaming DMA mapping for proper PCI bus operation */ + priv->pci_map_rx_address[index] = + pci_map_single(priv->pdev, (void *) skb->data, + MAX_FRAGMENT_SIZE_RX + 2, + PCI_DMA_FROMDEVICE); + if (unlikely(priv->pci_map_rx_address[index] == (dma_addr_t) NULL)) { + /* error mapping the buffer to device accessable memory address */ + DEBUG(SHOW_ERROR_MESSAGES, + "Error mapping DMA address\n"); + + /* free the skbuf structure before aborting */ + dev_kfree_skb_irq((struct sk_buff *) skb); + skb = NULL; + break; + } + /* update the fragment address */ + control_block->rx_data_low[index].address = cpu_to_le32((u32) + priv-> + pci_map_rx_address + [index]); + wmb(); + + /* increment the driver read pointer */ + add_le32p((u32 *) &control_block-> + driver_curr_frag[ISL38XX_CB_RX_DATA_LQ], 1); + } + + /* trigger the device */ + islpci_trigger(priv); + + return 0; +} + +void +islpci_do_reset_and_wake(void *data) +{ + islpci_private *priv = (islpci_private *) data; + islpci_reset(priv, 1); + netif_wake_queue(priv->ndev); + priv->reset_task_pending = 0; +} + +void +islpci_eth_tx_timeout(struct net_device *ndev) +{ + islpci_private *priv = netdev_priv(ndev); + struct net_device_stats *statistics = &priv->statistics; + + /* increment the transmit error counter */ + statistics->tx_errors++; + + printk(KERN_WARNING "%s: tx_timeout", ndev->name); + if (!priv->reset_task_pending) { + priv->reset_task_pending = 1; + printk(", scheduling a reset"); + netif_stop_queue(ndev); + schedule_work(&priv->reset_task); + } + printk("\n"); +} |