include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...

[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / prism54 / islpci_eth.c

/*
 *  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/gfp.h>

#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <asm/byteorder.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]) {
                        /* 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++;
        }
}

netdev_tx_t
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;

#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);
                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);
                                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);
                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;
        ndev->stats.tx_packets++;
        ndev->stats.tx_bytes += skb->len;

        /* trigger the device */
        islpci_trigger(priv);

        /* unlock the driver code */
        spin_unlock_irqrestore(&priv->slock, flags);

        return NETDEV_TX_OK;

      drop_free:
        ndev->stats.tx_dropped++;
        spin_unlock_irqrestore(&priv->slock, flags);
        dev_kfree_skb(skb);
        return NETDEV_TX_OK;
}

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(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;
        ndev->stats.rx_packets++;
        ndev->stats.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])) {
                        /* 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 */
                le32_add_cpu(&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);

        /* increment the transmit error counter */
        ndev->stats.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);
        }
}