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/*

 *  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/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);

        /* 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);

                                skb_copy_to_linear_data(skb, 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) {

                                skb_copy_from_linear_data(skb,

                                                          newskb->data + 6,

                                                          skb->len);

                                skb_copy_to_linear_data(newskb, wds_mac, 6);

#ifdef ISLPCI_ETH_DEBUG

                                printk("islpci_eth_transmit:wds_mac\n");

#endif

                        } else

                                skb_copy_from_linear_data(skb, newskb->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_irq(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 */

        frame_size = skb->len;

        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;

        }

        /* set the transmission time */

        ndev->trans_start = jiffies;

        priv->statistics.tx_packets++;

        priv->statistics.tx_bytes += skb->len;

        /* trigger the device */

        islpci_trigger(priv);

        /* unlock the driver code */

        spin_unlock_irqrestore(&priv->slock, flags);

        return 0;

      drop_free:

        priv->statistics.tx_dropped++;

        spin_unlock_irqrestore(&priv->slock, flags);

        dev_kfree_skb(skb);

        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_reset_mac_header(*skb);

        (*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

        /* take care of monitor mode and spy monitoring. */

        if (unlikely(priv->iw_mode == IW_MODE_MONITOR)) {

                skb->dev = ndev;

                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);

                        skb_copy_from_linear_data(skb,

                                                  (skb->data +

                                                   sizeof(struct rfmon_header)),

                                                  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(struct work_struct *work)

{

        islpci_private *priv = container_of(work, islpci_private, reset_task);

        islpci_reset(priv, 1);

        priv->reset_task_pending = 0;

        smp_wmb();

        netif_wake_queue(priv->ndev);

}

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++;

        if (!priv->reset_task_pending) {

                printk(KERN_WARNING

                        "%s: tx_timeout, scheduling reset", ndev->name);

                netif_stop_queue(ndev);

                priv->reset_task_pending = 1;

                schedule_work(&priv->reset_task);

        } else {

                printk(KERN_WARNING

                        "%s: tx_timeout, waiting for reset", ndev->name);

        }

}