/* * Copyright (C) 2002 Intersil Americas Inc. * Copyright (C) 2004 Aurelien Alleaume * 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 #include #include #include #include #include #include #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(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 */ 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); 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); } }