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543 lines
17 KiB
543 lines
17 KiB
/******************************************************************************
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*
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* Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
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*
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* Portions of this file are derived from the ipw3945 project, as well
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* as portions of the ieee80211 subsystem header files.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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*
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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*****************************************************************************/
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#include <linux/etherdevice.h>
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#include <linux/slab.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "iwl-eeprom.h"
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#include "iwl-dev.h"
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#include "iwl-core.h"
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#include "iwl-sta.h"
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#include "iwl-io.h"
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#include "iwl-calib.h"
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#include "iwl-helpers.h"
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/************************** RX-FUNCTIONS ****************************/
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/*
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* Rx theory of operation
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*
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* Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
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* each of which point to Receive Buffers to be filled by the NIC. These get
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* used not only for Rx frames, but for any command response or notification
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* from the NIC. The driver and NIC manage the Rx buffers by means
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* of indexes into the circular buffer.
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*
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* Rx Queue Indexes
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* The host/firmware share two index registers for managing the Rx buffers.
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*
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* The READ index maps to the first position that the firmware may be writing
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* to -- the driver can read up to (but not including) this position and get
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* good data.
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* The READ index is managed by the firmware once the card is enabled.
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*
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* The WRITE index maps to the last position the driver has read from -- the
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* position preceding WRITE is the last slot the firmware can place a packet.
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*
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* The queue is empty (no good data) if WRITE = READ - 1, and is full if
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* WRITE = READ.
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*
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* During initialization, the host sets up the READ queue position to the first
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* INDEX position, and WRITE to the last (READ - 1 wrapped)
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*
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* When the firmware places a packet in a buffer, it will advance the READ index
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* and fire the RX interrupt. The driver can then query the READ index and
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* process as many packets as possible, moving the WRITE index forward as it
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* resets the Rx queue buffers with new memory.
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*
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* The management in the driver is as follows:
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* + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free. When
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* iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
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* to replenish the iwl->rxq->rx_free.
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* + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
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* iwl->rxq is replenished and the READ INDEX is updated (updating the
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* 'processed' and 'read' driver indexes as well)
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* + A received packet is processed and handed to the kernel network stack,
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* detached from the iwl->rxq. The driver 'processed' index is updated.
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* + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
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* list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
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* INDEX is not incremented and iwl->status(RX_STALLED) is set. If there
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* were enough free buffers and RX_STALLED is set it is cleared.
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*
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*
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* Driver sequence:
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*
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* iwl_rx_queue_alloc() Allocates rx_free
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* iwl_rx_replenish() Replenishes rx_free list from rx_used, and calls
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* iwl_rx_queue_restock
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* iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
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* queue, updates firmware pointers, and updates
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* the WRITE index. If insufficient rx_free buffers
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* are available, schedules iwl_rx_replenish
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*
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* -- enable interrupts --
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* ISR - iwl_rx() Detach iwl_rx_mem_buffers from pool up to the
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* READ INDEX, detaching the SKB from the pool.
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* Moves the packet buffer from queue to rx_used.
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* Calls iwl_rx_queue_restock to refill any empty
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* slots.
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* ...
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*
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*/
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/**
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* iwl_rx_queue_space - Return number of free slots available in queue.
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*/
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int iwl_rx_queue_space(const struct iwl_rx_queue *q)
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{
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int s = q->read - q->write;
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if (s <= 0)
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s += RX_QUEUE_SIZE;
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/* keep some buffer to not confuse full and empty queue */
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s -= 2;
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if (s < 0)
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s = 0;
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return s;
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}
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EXPORT_SYMBOL(iwl_rx_queue_space);
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/**
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* iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
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*/
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void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
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{
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unsigned long flags;
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u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg;
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u32 reg;
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spin_lock_irqsave(&q->lock, flags);
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if (q->need_update == 0)
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goto exit_unlock;
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/* If power-saving is in use, make sure device is awake */
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if (test_bit(STATUS_POWER_PMI, &priv->status)) {
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reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
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if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
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IWL_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n",
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reg);
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iwl_set_bit(priv, CSR_GP_CNTRL,
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CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
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goto exit_unlock;
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}
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q->write_actual = (q->write & ~0x7);
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iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
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/* Else device is assumed to be awake */
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} else {
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/* Device expects a multiple of 8 */
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q->write_actual = (q->write & ~0x7);
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iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
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}
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q->need_update = 0;
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exit_unlock:
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spin_unlock_irqrestore(&q->lock, flags);
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}
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EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
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int iwl_rx_queue_alloc(struct iwl_priv *priv)
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{
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struct iwl_rx_queue *rxq = &priv->rxq;
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struct device *dev = &priv->pci_dev->dev;
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int i;
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spin_lock_init(&rxq->lock);
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INIT_LIST_HEAD(&rxq->rx_free);
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INIT_LIST_HEAD(&rxq->rx_used);
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/* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
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rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr,
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GFP_KERNEL);
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if (!rxq->bd)
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goto err_bd;
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rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status),
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&rxq->rb_stts_dma, GFP_KERNEL);
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if (!rxq->rb_stts)
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goto err_rb;
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/* Fill the rx_used queue with _all_ of the Rx buffers */
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for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
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list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
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/* Set us so that we have processed and used all buffers, but have
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* not restocked the Rx queue with fresh buffers */
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rxq->read = rxq->write = 0;
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rxq->write_actual = 0;
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rxq->free_count = 0;
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rxq->need_update = 0;
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return 0;
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err_rb:
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dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
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rxq->dma_addr);
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err_bd:
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return -ENOMEM;
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}
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EXPORT_SYMBOL(iwl_rx_queue_alloc);
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void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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{
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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struct iwl_missed_beacon_notif *missed_beacon;
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missed_beacon = &pkt->u.missed_beacon;
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if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
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priv->missed_beacon_threshold) {
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IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
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le32_to_cpu(missed_beacon->consecutive_missed_beacons),
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le32_to_cpu(missed_beacon->total_missed_becons),
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le32_to_cpu(missed_beacon->num_recvd_beacons),
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le32_to_cpu(missed_beacon->num_expected_beacons));
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if (!test_bit(STATUS_SCANNING, &priv->status))
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iwl_init_sensitivity(priv);
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}
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}
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EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
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void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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{
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
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if (!report->state) {
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IWL_DEBUG_11H(priv,
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"Spectrum Measure Notification: Start\n");
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return;
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}
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memcpy(&priv->measure_report, report, sizeof(*report));
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priv->measurement_status |= MEASUREMENT_READY;
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}
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EXPORT_SYMBOL(iwl_rx_spectrum_measure_notif);
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/* Calculate noise level, based on measurements during network silence just
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* before arriving beacon. This measurement can be done only if we know
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* exactly when to expect beacons, therefore only when we're associated. */
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static void iwl_rx_calc_noise(struct iwl_priv *priv)
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{
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struct statistics_rx_non_phy *rx_info
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= &(priv->statistics.rx.general);
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int num_active_rx = 0;
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int total_silence = 0;
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int bcn_silence_a =
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le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
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int bcn_silence_b =
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le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
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int bcn_silence_c =
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le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
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int last_rx_noise;
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if (bcn_silence_a) {
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total_silence += bcn_silence_a;
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num_active_rx++;
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}
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if (bcn_silence_b) {
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total_silence += bcn_silence_b;
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num_active_rx++;
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}
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if (bcn_silence_c) {
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total_silence += bcn_silence_c;
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num_active_rx++;
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}
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/* Average among active antennas */
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if (num_active_rx)
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last_rx_noise = (total_silence / num_active_rx) - 107;
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else
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last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
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IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
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bcn_silence_a, bcn_silence_b, bcn_silence_c,
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last_rx_noise);
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}
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#ifdef CONFIG_IWLWIFI_DEBUG
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/*
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* based on the assumption of all statistics counter are in DWORD
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* FIXME: This function is for debugging, do not deal with
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* the case of counters roll-over.
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*/
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static void iwl_accumulative_statistics(struct iwl_priv *priv,
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__le32 *stats)
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{
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int i;
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__le32 *prev_stats;
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u32 *accum_stats;
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u32 *delta, *max_delta;
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prev_stats = (__le32 *)&priv->statistics;
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accum_stats = (u32 *)&priv->accum_statistics;
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delta = (u32 *)&priv->delta_statistics;
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max_delta = (u32 *)&priv->max_delta;
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for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
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i += sizeof(__le32), stats++, prev_stats++, delta++,
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max_delta++, accum_stats++) {
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if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
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*delta = (le32_to_cpu(*stats) -
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le32_to_cpu(*prev_stats));
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*accum_stats += *delta;
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if (*delta > *max_delta)
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*max_delta = *delta;
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}
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}
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/* reset accumulative statistics for "no-counter" type statistics */
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priv->accum_statistics.general.temperature =
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priv->statistics.general.temperature;
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priv->accum_statistics.general.temperature_m =
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priv->statistics.general.temperature_m;
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priv->accum_statistics.general.ttl_timestamp =
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priv->statistics.general.ttl_timestamp;
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priv->accum_statistics.tx.tx_power.ant_a =
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priv->statistics.tx.tx_power.ant_a;
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priv->accum_statistics.tx.tx_power.ant_b =
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priv->statistics.tx.tx_power.ant_b;
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priv->accum_statistics.tx.tx_power.ant_c =
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priv->statistics.tx.tx_power.ant_c;
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}
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#endif
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#define REG_RECALIB_PERIOD (60)
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/**
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* iwl_good_plcp_health - checks for plcp error.
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*
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* When the plcp error is exceeding the thresholds, reset the radio
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* to improve the throughput.
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*/
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bool iwl_good_plcp_health(struct iwl_priv *priv,
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struct iwl_rx_packet *pkt)
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{
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bool rc = true;
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int combined_plcp_delta;
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unsigned int plcp_msec;
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unsigned long plcp_received_jiffies;
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/*
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* check for plcp_err and trigger radio reset if it exceeds
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* the plcp error threshold plcp_delta.
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*/
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plcp_received_jiffies = jiffies;
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plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
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(long) priv->plcp_jiffies);
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priv->plcp_jiffies = plcp_received_jiffies;
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/*
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* check to make sure plcp_msec is not 0 to prevent division
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* by zero.
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*/
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if (plcp_msec) {
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combined_plcp_delta =
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(le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err) -
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le32_to_cpu(priv->statistics.rx.ofdm.plcp_err)) +
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(le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err) -
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le32_to_cpu(priv->statistics.rx.ofdm_ht.plcp_err));
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if ((combined_plcp_delta > 0) &&
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((combined_plcp_delta * 100) / plcp_msec) >
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priv->cfg->plcp_delta_threshold) {
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/*
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* if plcp_err exceed the threshold,
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* the following data is printed in csv format:
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* Text: plcp_err exceeded %d,
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* Received ofdm.plcp_err,
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* Current ofdm.plcp_err,
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* Received ofdm_ht.plcp_err,
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* Current ofdm_ht.plcp_err,
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* combined_plcp_delta,
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* plcp_msec
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*/
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IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
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"%u, %u, %u, %u, %d, %u mSecs\n",
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priv->cfg->plcp_delta_threshold,
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le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err),
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le32_to_cpu(priv->statistics.rx.ofdm.plcp_err),
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le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err),
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le32_to_cpu(
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priv->statistics.rx.ofdm_ht.plcp_err),
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combined_plcp_delta, plcp_msec);
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rc = false;
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}
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}
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return rc;
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}
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EXPORT_SYMBOL(iwl_good_plcp_health);
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void iwl_recover_from_statistics(struct iwl_priv *priv,
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struct iwl_rx_packet *pkt)
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{
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if (test_bit(STATUS_EXIT_PENDING, &priv->status))
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return;
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if (iwl_is_associated(priv)) {
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if (priv->cfg->ops->lib->check_ack_health) {
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if (!priv->cfg->ops->lib->check_ack_health(
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priv, pkt)) {
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/*
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* low ack count detected
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* restart Firmware
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*/
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IWL_ERR(priv, "low ack count detected, "
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"restart firmware\n");
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if (!iwl_force_reset(priv, IWL_FW_RESET))
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return;
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}
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}
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if (priv->cfg->ops->lib->check_plcp_health) {
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if (!priv->cfg->ops->lib->check_plcp_health(
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priv, pkt)) {
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/*
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* high plcp error detected
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* reset Radio
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*/
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iwl_force_reset(priv, IWL_RF_RESET);
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}
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}
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}
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}
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EXPORT_SYMBOL(iwl_recover_from_statistics);
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void iwl_rx_statistics(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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{
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int change;
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
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(int)sizeof(priv->statistics),
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le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);
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change = ((priv->statistics.general.temperature !=
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pkt->u.stats.general.temperature) ||
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((priv->statistics.flag &
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STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
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(pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
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#ifdef CONFIG_IWLWIFI_DEBUG
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iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
|
|
#endif
|
|
iwl_recover_from_statistics(priv, pkt);
|
|
|
|
memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
|
|
|
|
set_bit(STATUS_STATISTICS, &priv->status);
|
|
|
|
/* Reschedule the statistics timer to occur in
|
|
* REG_RECALIB_PERIOD seconds to ensure we get a
|
|
* thermal update even if the uCode doesn't give
|
|
* us one */
|
|
mod_timer(&priv->statistics_periodic, jiffies +
|
|
msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
|
|
|
|
if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
|
|
(pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
|
|
iwl_rx_calc_noise(priv);
|
|
queue_work(priv->workqueue, &priv->run_time_calib_work);
|
|
}
|
|
if (priv->cfg->ops->lib->temp_ops.temperature && change)
|
|
priv->cfg->ops->lib->temp_ops.temperature(priv);
|
|
}
|
|
EXPORT_SYMBOL(iwl_rx_statistics);
|
|
|
|
void iwl_reply_statistics(struct iwl_priv *priv,
|
|
struct iwl_rx_mem_buffer *rxb)
|
|
{
|
|
struct iwl_rx_packet *pkt = rxb_addr(rxb);
|
|
|
|
if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
|
|
#ifdef CONFIG_IWLWIFI_DEBUG
|
|
memset(&priv->accum_statistics, 0,
|
|
sizeof(struct iwl_notif_statistics));
|
|
memset(&priv->delta_statistics, 0,
|
|
sizeof(struct iwl_notif_statistics));
|
|
memset(&priv->max_delta, 0,
|
|
sizeof(struct iwl_notif_statistics));
|
|
#endif
|
|
IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
|
|
}
|
|
iwl_rx_statistics(priv, rxb);
|
|
}
|
|
EXPORT_SYMBOL(iwl_reply_statistics);
|
|
|
|
/*
|
|
* returns non-zero if packet should be dropped
|
|
*/
|
|
int iwl_set_decrypted_flag(struct iwl_priv *priv,
|
|
struct ieee80211_hdr *hdr,
|
|
u32 decrypt_res,
|
|
struct ieee80211_rx_status *stats)
|
|
{
|
|
u16 fc = le16_to_cpu(hdr->frame_control);
|
|
|
|
if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
|
|
return 0;
|
|
|
|
if (!(fc & IEEE80211_FCTL_PROTECTED))
|
|
return 0;
|
|
|
|
IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
|
|
switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
|
|
case RX_RES_STATUS_SEC_TYPE_TKIP:
|
|
/* The uCode has got a bad phase 1 Key, pushes the packet.
|
|
* Decryption will be done in SW. */
|
|
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
|
|
RX_RES_STATUS_BAD_KEY_TTAK)
|
|
break;
|
|
|
|
case RX_RES_STATUS_SEC_TYPE_WEP:
|
|
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
|
|
RX_RES_STATUS_BAD_ICV_MIC) {
|
|
/* bad ICV, the packet is destroyed since the
|
|
* decryption is inplace, drop it */
|
|
IWL_DEBUG_RX(priv, "Packet destroyed\n");
|
|
return -1;
|
|
}
|
|
case RX_RES_STATUS_SEC_TYPE_CCMP:
|
|
if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
|
|
RX_RES_STATUS_DECRYPT_OK) {
|
|
IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
|
|
stats->flag |= RX_FLAG_DECRYPTED;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iwl_set_decrypted_flag);
|
|
|