![Tomas Winkler](/assets/img/avatar_default.png)
This patch implements rssi calculation for 5000 HW. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
1295 lines
39 KiB
C
1295 lines
39 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2003 - 2008 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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* James P. Ketrenos <ipw2100-admin@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 <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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int iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
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{
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u32 reg = 0;
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int ret = 0;
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unsigned long flags;
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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_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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ret = iwl_grab_nic_access(priv);
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if (ret)
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goto exit_unlock;
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/* Device expects a multiple of 8 */
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iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR,
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q->write & ~0x7);
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iwl_release_nic_access(priv);
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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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iwl_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write & ~0x7);
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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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return ret;
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}
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EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
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/**
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* iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
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*/
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static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv,
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dma_addr_t dma_addr)
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{
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return cpu_to_le32((u32)(dma_addr >> 8));
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}
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/**
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* iwl_rx_queue_restock - refill RX queue from pre-allocated pool
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*
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* If there are slots in the RX queue that need to be restocked,
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* and we have free pre-allocated buffers, fill the ranks as much
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* as we can, pulling from rx_free.
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*
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* This moves the 'write' index forward to catch up with 'processed', and
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* also updates the memory address in the firmware to reference the new
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* target buffer.
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*/
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int iwl_rx_queue_restock(struct iwl_priv *priv)
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{
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struct iwl_rx_queue *rxq = &priv->rxq;
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struct list_head *element;
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struct iwl_rx_mem_buffer *rxb;
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unsigned long flags;
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int write;
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int ret = 0;
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spin_lock_irqsave(&rxq->lock, flags);
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write = rxq->write & ~0x7;
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while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
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/* Get next free Rx buffer, remove from free list */
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element = rxq->rx_free.next;
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rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
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list_del(element);
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/* Point to Rx buffer via next RBD in circular buffer */
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rxq->bd[rxq->write] = iwl_dma_addr2rbd_ptr(priv, rxb->dma_addr);
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rxq->queue[rxq->write] = rxb;
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rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
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rxq->free_count--;
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}
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spin_unlock_irqrestore(&rxq->lock, flags);
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/* If the pre-allocated buffer pool is dropping low, schedule to
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* refill it */
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if (rxq->free_count <= RX_LOW_WATERMARK)
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queue_work(priv->workqueue, &priv->rx_replenish);
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/* If we've added more space for the firmware to place data, tell it.
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* Increment device's write pointer in multiples of 8. */
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if ((write != (rxq->write & ~0x7))
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|| (abs(rxq->write - rxq->read) > 7)) {
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spin_lock_irqsave(&rxq->lock, flags);
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rxq->need_update = 1;
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spin_unlock_irqrestore(&rxq->lock, flags);
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ret = iwl_rx_queue_update_write_ptr(priv, rxq);
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}
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return ret;
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}
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EXPORT_SYMBOL(iwl_rx_queue_restock);
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/**
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* iwl_rx_replenish - Move all used packet from rx_used to rx_free
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*
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* When moving to rx_free an SKB is allocated for the slot.
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*
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* Also restock the Rx queue via iwl_rx_queue_restock.
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* This is called as a scheduled work item (except for during initialization)
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*/
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void iwl_rx_allocate(struct iwl_priv *priv)
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{
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struct iwl_rx_queue *rxq = &priv->rxq;
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struct list_head *element;
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struct iwl_rx_mem_buffer *rxb;
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unsigned long flags;
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spin_lock_irqsave(&rxq->lock, flags);
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while (!list_empty(&rxq->rx_used)) {
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element = rxq->rx_used.next;
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rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
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/* Alloc a new receive buffer */
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rxb->skb = alloc_skb(priv->hw_params.rx_buf_size,
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__GFP_NOWARN | GFP_ATOMIC);
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if (!rxb->skb) {
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if (net_ratelimit())
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printk(KERN_CRIT DRV_NAME
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": Can not allocate SKB buffers\n");
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/* We don't reschedule replenish work here -- we will
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* call the restock method and if it still needs
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* more buffers it will schedule replenish */
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break;
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}
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priv->alloc_rxb_skb++;
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list_del(element);
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/* Get physical address of RB/SKB */
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rxb->dma_addr =
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pci_map_single(priv->pci_dev, rxb->skb->data,
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priv->hw_params.rx_buf_size, PCI_DMA_FROMDEVICE);
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list_add_tail(&rxb->list, &rxq->rx_free);
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rxq->free_count++;
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}
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spin_unlock_irqrestore(&rxq->lock, flags);
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}
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EXPORT_SYMBOL(iwl_rx_allocate);
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void iwl_rx_replenish(struct iwl_priv *priv)
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{
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unsigned long flags;
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iwl_rx_allocate(priv);
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spin_lock_irqsave(&priv->lock, flags);
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iwl_rx_queue_restock(priv);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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EXPORT_SYMBOL(iwl_rx_replenish);
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/* Assumes that the skb field of the buffers in 'pool' is kept accurate.
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* If an SKB has been detached, the POOL needs to have its SKB set to NULL
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* This free routine walks the list of POOL entries and if SKB is set to
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* non NULL it is unmapped and freed
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*/
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void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
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{
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int i;
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for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
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if (rxq->pool[i].skb != NULL) {
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pci_unmap_single(priv->pci_dev,
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rxq->pool[i].dma_addr,
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priv->hw_params.rx_buf_size,
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PCI_DMA_FROMDEVICE);
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dev_kfree_skb(rxq->pool[i].skb);
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}
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}
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pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd,
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rxq->dma_addr);
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rxq->bd = NULL;
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}
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EXPORT_SYMBOL(iwl_rx_queue_free);
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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 pci_dev *dev = priv->pci_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 = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr);
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if (!rxq->bd)
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return -ENOMEM;
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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->free_count = 0;
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rxq->need_update = 0;
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return 0;
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}
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EXPORT_SYMBOL(iwl_rx_queue_alloc);
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void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
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{
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unsigned long flags;
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int i;
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spin_lock_irqsave(&rxq->lock, flags);
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INIT_LIST_HEAD(&rxq->rx_free);
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INIT_LIST_HEAD(&rxq->rx_used);
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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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/* In the reset function, these buffers may have been allocated
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* to an SKB, so we need to unmap and free potential storage */
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if (rxq->pool[i].skb != NULL) {
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pci_unmap_single(priv->pci_dev,
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rxq->pool[i].dma_addr,
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priv->hw_params.rx_buf_size,
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PCI_DMA_FROMDEVICE);
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priv->alloc_rxb_skb--;
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dev_kfree_skb(rxq->pool[i].skb);
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rxq->pool[i].skb = NULL;
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}
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list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
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}
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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->free_count = 0;
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spin_unlock_irqrestore(&rxq->lock, flags);
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}
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EXPORT_SYMBOL(iwl_rx_queue_reset);
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int iwl_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
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{
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int ret;
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unsigned long flags;
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unsigned int rb_size;
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spin_lock_irqsave(&priv->lock, flags);
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ret = iwl_grab_nic_access(priv);
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if (ret) {
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spin_unlock_irqrestore(&priv->lock, flags);
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return ret;
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}
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if (priv->cfg->mod_params->amsdu_size_8K)
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rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
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else
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rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
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/* Stop Rx DMA */
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iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
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/* Reset driver's Rx queue write index */
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iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
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/* Tell device where to find RBD circular buffer in DRAM */
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iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
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rxq->dma_addr >> 8);
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/* Tell device where in DRAM to update its Rx status */
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iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
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(priv->shared_phys + priv->rb_closed_offset) >> 4);
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/* Enable Rx DMA, enable host interrupt, Rx buffer size 4k, 256 RBDs */
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iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
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FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
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FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
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rb_size |
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/* 0x10 << 4 | */
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(RX_QUEUE_SIZE_LOG <<
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FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT));
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/*
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* iwl_write32(priv,CSR_INT_COAL_REG,0);
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*/
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iwl_release_nic_access(priv);
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spin_unlock_irqrestore(&priv->lock, flags);
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return 0;
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}
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int iwl_rxq_stop(struct iwl_priv *priv)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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ret = iwl_grab_nic_access(priv);
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if (unlikely(ret)) {
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spin_unlock_irqrestore(&priv->lock, flags);
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return ret;
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}
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/* stop Rx DMA */
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iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
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ret = iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
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(1 << 24), 1000);
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if (ret < 0)
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IWL_ERROR("Can't stop Rx DMA.\n");
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iwl_release_nic_access(priv);
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spin_unlock_irqrestore(&priv->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(iwl_rxq_stop);
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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 = (struct iwl_rx_packet *)rxb->skb->data;
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struct iwl4965_missed_beacon_notif *missed_beacon;
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|
|
missed_beacon = &pkt->u.missed_beacon;
|
|
if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
|
|
IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
|
|
le32_to_cpu(missed_beacon->consequtive_missed_beacons),
|
|
le32_to_cpu(missed_beacon->total_missed_becons),
|
|
le32_to_cpu(missed_beacon->num_recvd_beacons),
|
|
le32_to_cpu(missed_beacon->num_expected_beacons));
|
|
if (!test_bit(STATUS_SCANNING, &priv->status))
|
|
iwl_init_sensitivity(priv);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
|
|
|
|
int iwl_rx_agg_start(struct iwl_priv *priv, const u8 *addr, int tid, u16 ssn)
|
|
{
|
|
unsigned long flags;
|
|
int sta_id;
|
|
|
|
sta_id = iwl_find_station(priv, addr);
|
|
if (sta_id == IWL_INVALID_STATION)
|
|
return -ENXIO;
|
|
|
|
spin_lock_irqsave(&priv->sta_lock, flags);
|
|
priv->stations[sta_id].sta.station_flags_msk = 0;
|
|
priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
|
|
priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
|
|
priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
|
|
priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
|
|
spin_unlock_irqrestore(&priv->sta_lock, flags);
|
|
|
|
return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
|
|
CMD_ASYNC);
|
|
}
|
|
EXPORT_SYMBOL(iwl_rx_agg_start);
|
|
|
|
int iwl_rx_agg_stop(struct iwl_priv *priv, const u8 *addr, int tid)
|
|
{
|
|
unsigned long flags;
|
|
int sta_id;
|
|
|
|
sta_id = iwl_find_station(priv, addr);
|
|
if (sta_id == IWL_INVALID_STATION)
|
|
return -ENXIO;
|
|
|
|
spin_lock_irqsave(&priv->sta_lock, flags);
|
|
priv->stations[sta_id].sta.station_flags_msk = 0;
|
|
priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
|
|
priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
|
|
priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
|
|
spin_unlock_irqrestore(&priv->sta_lock, flags);
|
|
|
|
return iwl_send_add_sta(priv, &priv->stations[sta_id].sta,
|
|
CMD_ASYNC);
|
|
}
|
|
EXPORT_SYMBOL(iwl_rx_agg_stop);
|
|
|
|
|
|
/* Calculate noise level, based on measurements during network silence just
|
|
* before arriving beacon. This measurement can be done only if we know
|
|
* exactly when to expect beacons, therefore only when we're associated. */
|
|
static void iwl_rx_calc_noise(struct iwl_priv *priv)
|
|
{
|
|
struct statistics_rx_non_phy *rx_info
|
|
= &(priv->statistics.rx.general);
|
|
int num_active_rx = 0;
|
|
int total_silence = 0;
|
|
int bcn_silence_a =
|
|
le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
|
|
int bcn_silence_b =
|
|
le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
|
|
int bcn_silence_c =
|
|
le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
|
|
|
|
if (bcn_silence_a) {
|
|
total_silence += bcn_silence_a;
|
|
num_active_rx++;
|
|
}
|
|
if (bcn_silence_b) {
|
|
total_silence += bcn_silence_b;
|
|
num_active_rx++;
|
|
}
|
|
if (bcn_silence_c) {
|
|
total_silence += bcn_silence_c;
|
|
num_active_rx++;
|
|
}
|
|
|
|
/* Average among active antennas */
|
|
if (num_active_rx)
|
|
priv->last_rx_noise = (total_silence / num_active_rx) - 107;
|
|
else
|
|
priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
|
|
|
|
IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
|
|
bcn_silence_a, bcn_silence_b, bcn_silence_c,
|
|
priv->last_rx_noise);
|
|
}
|
|
|
|
#define REG_RECALIB_PERIOD (60)
|
|
|
|
void iwl_rx_statistics(struct iwl_priv *priv,
|
|
struct iwl_rx_mem_buffer *rxb)
|
|
{
|
|
int change;
|
|
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
|
|
|
|
IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
|
|
(int)sizeof(priv->statistics), pkt->len);
|
|
|
|
change = ((priv->statistics.general.temperature !=
|
|
pkt->u.stats.general.temperature) ||
|
|
((priv->statistics.flag &
|
|
STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
|
|
(pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));
|
|
|
|
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);
|
|
}
|
|
|
|
iwl_leds_background(priv);
|
|
|
|
if (priv->cfg->ops->lib->temperature && change)
|
|
priv->cfg->ops->lib->temperature(priv);
|
|
}
|
|
EXPORT_SYMBOL(iwl_rx_statistics);
|
|
|
|
#define PERFECT_RSSI (-20) /* dBm */
|
|
#define WORST_RSSI (-95) /* dBm */
|
|
#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI)
|
|
|
|
/* Calculate an indication of rx signal quality (a percentage, not dBm!).
|
|
* See http://www.ces.clemson.edu/linux/signal_quality.shtml for info
|
|
* about formulas used below. */
|
|
static int iwl_calc_sig_qual(int rssi_dbm, int noise_dbm)
|
|
{
|
|
int sig_qual;
|
|
int degradation = PERFECT_RSSI - rssi_dbm;
|
|
|
|
/* If we get a noise measurement, use signal-to-noise ratio (SNR)
|
|
* as indicator; formula is (signal dbm - noise dbm).
|
|
* SNR at or above 40 is a great signal (100%).
|
|
* Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator.
|
|
* Weakest usable signal is usually 10 - 15 dB SNR. */
|
|
if (noise_dbm) {
|
|
if (rssi_dbm - noise_dbm >= 40)
|
|
return 100;
|
|
else if (rssi_dbm < noise_dbm)
|
|
return 0;
|
|
sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2;
|
|
|
|
/* Else use just the signal level.
|
|
* This formula is a least squares fit of data points collected and
|
|
* compared with a reference system that had a percentage (%) display
|
|
* for signal quality. */
|
|
} else
|
|
sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation *
|
|
(15 * RSSI_RANGE + 62 * degradation)) /
|
|
(RSSI_RANGE * RSSI_RANGE);
|
|
|
|
if (sig_qual > 100)
|
|
sig_qual = 100;
|
|
else if (sig_qual < 1)
|
|
sig_qual = 0;
|
|
|
|
return sig_qual;
|
|
}
|
|
|
|
#ifdef CONFIG_IWLWIFI_DEBUG
|
|
|
|
/**
|
|
* iwl_dbg_report_frame - dump frame to syslog during debug sessions
|
|
*
|
|
* You may hack this function to show different aspects of received frames,
|
|
* including selective frame dumps.
|
|
* group100 parameter selects whether to show 1 out of 100 good frames.
|
|
*
|
|
* TODO: This was originally written for 3945, need to audit for
|
|
* proper operation with 4965.
|
|
*/
|
|
static void iwl_dbg_report_frame(struct iwl_priv *priv,
|
|
struct iwl_rx_packet *pkt,
|
|
struct ieee80211_hdr *header, int group100)
|
|
{
|
|
u32 to_us;
|
|
u32 print_summary = 0;
|
|
u32 print_dump = 0; /* set to 1 to dump all frames' contents */
|
|
u32 hundred = 0;
|
|
u32 dataframe = 0;
|
|
__le16 fc;
|
|
u16 seq_ctl;
|
|
u16 channel;
|
|
u16 phy_flags;
|
|
int rate_sym;
|
|
u16 length;
|
|
u16 status;
|
|
u16 bcn_tmr;
|
|
u32 tsf_low;
|
|
u64 tsf;
|
|
u8 rssi;
|
|
u8 agc;
|
|
u16 sig_avg;
|
|
u16 noise_diff;
|
|
struct iwl4965_rx_frame_stats *rx_stats = IWL_RX_STATS(pkt);
|
|
struct iwl4965_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
|
|
struct iwl4965_rx_frame_end *rx_end = IWL_RX_END(pkt);
|
|
u8 *data = IWL_RX_DATA(pkt);
|
|
|
|
if (likely(!(priv->debug_level & IWL_DL_RX)))
|
|
return;
|
|
|
|
/* MAC header */
|
|
fc = header->frame_control;
|
|
seq_ctl = le16_to_cpu(header->seq_ctrl);
|
|
|
|
/* metadata */
|
|
channel = le16_to_cpu(rx_hdr->channel);
|
|
phy_flags = le16_to_cpu(rx_hdr->phy_flags);
|
|
rate_sym = rx_hdr->rate;
|
|
length = le16_to_cpu(rx_hdr->len);
|
|
|
|
/* end-of-frame status and timestamp */
|
|
status = le32_to_cpu(rx_end->status);
|
|
bcn_tmr = le32_to_cpu(rx_end->beacon_timestamp);
|
|
tsf_low = le64_to_cpu(rx_end->timestamp) & 0x0ffffffff;
|
|
tsf = le64_to_cpu(rx_end->timestamp);
|
|
|
|
/* signal statistics */
|
|
rssi = rx_stats->rssi;
|
|
agc = rx_stats->agc;
|
|
sig_avg = le16_to_cpu(rx_stats->sig_avg);
|
|
noise_diff = le16_to_cpu(rx_stats->noise_diff);
|
|
|
|
to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
|
|
|
|
/* if data frame is to us and all is good,
|
|
* (optionally) print summary for only 1 out of every 100 */
|
|
if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) ==
|
|
cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
|
|
dataframe = 1;
|
|
if (!group100)
|
|
print_summary = 1; /* print each frame */
|
|
else if (priv->framecnt_to_us < 100) {
|
|
priv->framecnt_to_us++;
|
|
print_summary = 0;
|
|
} else {
|
|
priv->framecnt_to_us = 0;
|
|
print_summary = 1;
|
|
hundred = 1;
|
|
}
|
|
} else {
|
|
/* print summary for all other frames */
|
|
print_summary = 1;
|
|
}
|
|
|
|
if (print_summary) {
|
|
char *title;
|
|
int rate_idx;
|
|
u32 bitrate;
|
|
|
|
if (hundred)
|
|
title = "100Frames";
|
|
else if (ieee80211_has_retry(fc))
|
|
title = "Retry";
|
|
else if (ieee80211_is_assoc_resp(fc))
|
|
title = "AscRsp";
|
|
else if (ieee80211_is_reassoc_resp(fc))
|
|
title = "RasRsp";
|
|
else if (ieee80211_is_probe_resp(fc)) {
|
|
title = "PrbRsp";
|
|
print_dump = 1; /* dump frame contents */
|
|
} else if (ieee80211_is_beacon(fc)) {
|
|
title = "Beacon";
|
|
print_dump = 1; /* dump frame contents */
|
|
} else if (ieee80211_is_atim(fc))
|
|
title = "ATIM";
|
|
else if (ieee80211_is_auth(fc))
|
|
title = "Auth";
|
|
else if (ieee80211_is_deauth(fc))
|
|
title = "DeAuth";
|
|
else if (ieee80211_is_disassoc(fc))
|
|
title = "DisAssoc";
|
|
else
|
|
title = "Frame";
|
|
|
|
rate_idx = iwl_hwrate_to_plcp_idx(rate_sym);
|
|
if (unlikely(rate_idx == -1))
|
|
bitrate = 0;
|
|
else
|
|
bitrate = iwl_rates[rate_idx].ieee / 2;
|
|
|
|
/* print frame summary.
|
|
* MAC addresses show just the last byte (for brevity),
|
|
* but you can hack it to show more, if you'd like to. */
|
|
if (dataframe)
|
|
IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
|
|
"len=%u, rssi=%d, chnl=%d, rate=%u, \n",
|
|
title, le16_to_cpu(fc), header->addr1[5],
|
|
length, rssi, channel, bitrate);
|
|
else {
|
|
/* src/dst addresses assume managed mode */
|
|
IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
|
|
"src=0x%02x, rssi=%u, tim=%lu usec, "
|
|
"phy=0x%02x, chnl=%d\n",
|
|
title, le16_to_cpu(fc), header->addr1[5],
|
|
header->addr3[5], rssi,
|
|
tsf_low - priv->scan_start_tsf,
|
|
phy_flags, channel);
|
|
}
|
|
}
|
|
if (print_dump)
|
|
iwl_print_hex_dump(priv, IWL_DL_RX, data, length);
|
|
}
|
|
#else
|
|
static inline void iwl_dbg_report_frame(struct iwl_priv *priv,
|
|
struct iwl_rx_packet *pkt,
|
|
struct ieee80211_hdr *header,
|
|
int group100)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void iwl_add_radiotap(struct iwl_priv *priv,
|
|
struct sk_buff *skb,
|
|
struct iwl_rx_phy_res *rx_start,
|
|
struct ieee80211_rx_status *stats,
|
|
u32 ampdu_status)
|
|
{
|
|
s8 signal = stats->signal;
|
|
s8 noise = 0;
|
|
int rate = stats->rate_idx;
|
|
u64 tsf = stats->mactime;
|
|
__le16 antenna;
|
|
__le16 phy_flags_hw = rx_start->phy_flags;
|
|
struct iwl4965_rt_rx_hdr {
|
|
struct ieee80211_radiotap_header rt_hdr;
|
|
__le64 rt_tsf; /* TSF */
|
|
u8 rt_flags; /* radiotap packet flags */
|
|
u8 rt_rate; /* rate in 500kb/s */
|
|
__le16 rt_channelMHz; /* channel in MHz */
|
|
__le16 rt_chbitmask; /* channel bitfield */
|
|
s8 rt_dbmsignal; /* signal in dBm, kluged to signed */
|
|
s8 rt_dbmnoise;
|
|
u8 rt_antenna; /* antenna number */
|
|
} __attribute__ ((packed)) *iwl4965_rt;
|
|
|
|
/* TODO: We won't have enough headroom for HT frames. Fix it later. */
|
|
if (skb_headroom(skb) < sizeof(*iwl4965_rt)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_ERR "not enough headroom [%d] for "
|
|
"radiotap head [%zd]\n",
|
|
skb_headroom(skb), sizeof(*iwl4965_rt));
|
|
return;
|
|
}
|
|
|
|
/* put radiotap header in front of 802.11 header and data */
|
|
iwl4965_rt = (void *)skb_push(skb, sizeof(*iwl4965_rt));
|
|
|
|
/* initialise radiotap header */
|
|
iwl4965_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
|
|
iwl4965_rt->rt_hdr.it_pad = 0;
|
|
|
|
/* total header + data */
|
|
put_unaligned_le16(sizeof(*iwl4965_rt), &iwl4965_rt->rt_hdr.it_len);
|
|
|
|
/* Indicate all the fields we add to the radiotap header */
|
|
put_unaligned_le32((1 << IEEE80211_RADIOTAP_TSFT) |
|
|
(1 << IEEE80211_RADIOTAP_FLAGS) |
|
|
(1 << IEEE80211_RADIOTAP_RATE) |
|
|
(1 << IEEE80211_RADIOTAP_CHANNEL) |
|
|
(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
|
|
(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE) |
|
|
(1 << IEEE80211_RADIOTAP_ANTENNA),
|
|
&(iwl4965_rt->rt_hdr.it_present));
|
|
|
|
/* Zero the flags, we'll add to them as we go */
|
|
iwl4965_rt->rt_flags = 0;
|
|
|
|
put_unaligned_le64(tsf, &iwl4965_rt->rt_tsf);
|
|
|
|
iwl4965_rt->rt_dbmsignal = signal;
|
|
iwl4965_rt->rt_dbmnoise = noise;
|
|
|
|
/* Convert the channel frequency and set the flags */
|
|
put_unaligned(cpu_to_le16(stats->freq), &iwl4965_rt->rt_channelMHz);
|
|
if (!(phy_flags_hw & RX_RES_PHY_FLAGS_BAND_24_MSK))
|
|
put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ,
|
|
&iwl4965_rt->rt_chbitmask);
|
|
else if (phy_flags_hw & RX_RES_PHY_FLAGS_MOD_CCK_MSK)
|
|
put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ,
|
|
&iwl4965_rt->rt_chbitmask);
|
|
else /* 802.11g */
|
|
put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ,
|
|
&iwl4965_rt->rt_chbitmask);
|
|
|
|
if (rate == -1)
|
|
iwl4965_rt->rt_rate = 0;
|
|
else
|
|
iwl4965_rt->rt_rate = iwl_rates[rate].ieee;
|
|
|
|
/*
|
|
* "antenna number"
|
|
*
|
|
* It seems that the antenna field in the phy flags value
|
|
* is actually a bitfield. This is undefined by radiotap,
|
|
* it wants an actual antenna number but I always get "7"
|
|
* for most legacy frames I receive indicating that the
|
|
* same frame was received on all three RX chains.
|
|
*
|
|
* I think this field should be removed in favour of a
|
|
* new 802.11n radiotap field "RX chains" that is defined
|
|
* as a bitmask.
|
|
*/
|
|
antenna = phy_flags_hw & RX_RES_PHY_FLAGS_ANTENNA_MSK;
|
|
iwl4965_rt->rt_antenna = le16_to_cpu(antenna) >> 4;
|
|
|
|
/* set the preamble flag if appropriate */
|
|
if (phy_flags_hw & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
|
|
iwl4965_rt->rt_flags |= IEEE80211_RADIOTAP_F_SHORTPRE;
|
|
|
|
stats->flag |= RX_FLAG_RADIOTAP;
|
|
}
|
|
|
|
static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
|
|
{
|
|
/* 0 - mgmt, 1 - cnt, 2 - data */
|
|
int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
|
|
priv->rx_stats[idx].cnt++;
|
|
priv->rx_stats[idx].bytes += len;
|
|
}
|
|
|
|
/*
|
|
* returns non-zero if packet should be dropped
|
|
*/
|
|
static 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("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("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("hw decrypt successfully!!!\n");
|
|
stats->flag |= RX_FLAG_DECRYPTED;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static u32 iwl_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
|
|
{
|
|
u32 decrypt_out = 0;
|
|
|
|
if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
|
|
RX_RES_STATUS_STATION_FOUND)
|
|
decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
|
|
RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
|
|
|
|
decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
|
|
|
|
/* packet was not encrypted */
|
|
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
|
|
RX_RES_STATUS_SEC_TYPE_NONE)
|
|
return decrypt_out;
|
|
|
|
/* packet was encrypted with unknown alg */
|
|
if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
|
|
RX_RES_STATUS_SEC_TYPE_ERR)
|
|
return decrypt_out;
|
|
|
|
/* decryption was not done in HW */
|
|
if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
|
|
RX_MPDU_RES_STATUS_DEC_DONE_MSK)
|
|
return decrypt_out;
|
|
|
|
switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
|
|
|
|
case RX_RES_STATUS_SEC_TYPE_CCMP:
|
|
/* alg is CCM: check MIC only */
|
|
if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
|
|
/* Bad MIC */
|
|
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
|
|
else
|
|
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
|
|
|
|
break;
|
|
|
|
case RX_RES_STATUS_SEC_TYPE_TKIP:
|
|
if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
|
|
/* Bad TTAK */
|
|
decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
|
|
break;
|
|
}
|
|
/* fall through if TTAK OK */
|
|
default:
|
|
if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
|
|
decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
|
|
else
|
|
decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
|
|
break;
|
|
};
|
|
|
|
IWL_DEBUG_RX("decrypt_in:0x%x decrypt_out = 0x%x\n",
|
|
decrypt_in, decrypt_out);
|
|
|
|
return decrypt_out;
|
|
}
|
|
|
|
static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
|
|
int include_phy,
|
|
struct iwl_rx_mem_buffer *rxb,
|
|
struct ieee80211_rx_status *stats)
|
|
{
|
|
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
|
|
struct iwl_rx_phy_res *rx_start = (include_phy) ?
|
|
(struct iwl_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
|
|
struct ieee80211_hdr *hdr;
|
|
u16 len;
|
|
__le32 *rx_end;
|
|
unsigned int skblen;
|
|
u32 ampdu_status;
|
|
u32 ampdu_status_legacy;
|
|
|
|
if (!include_phy && priv->last_phy_res[0])
|
|
rx_start = (struct iwl_rx_phy_res *)&priv->last_phy_res[1];
|
|
|
|
if (!rx_start) {
|
|
IWL_ERROR("MPDU frame without a PHY data\n");
|
|
return;
|
|
}
|
|
if (include_phy) {
|
|
hdr = (struct ieee80211_hdr *)((u8 *) &rx_start[1] +
|
|
rx_start->cfg_phy_cnt);
|
|
|
|
len = le16_to_cpu(rx_start->byte_count);
|
|
|
|
rx_end = (__le32 *)((u8 *) &pkt->u.raw[0] +
|
|
sizeof(struct iwl_rx_phy_res) +
|
|
rx_start->cfg_phy_cnt + len);
|
|
|
|
} else {
|
|
struct iwl4965_rx_mpdu_res_start *amsdu =
|
|
(struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
|
|
|
|
hdr = (struct ieee80211_hdr *)(pkt->u.raw +
|
|
sizeof(struct iwl4965_rx_mpdu_res_start));
|
|
len = le16_to_cpu(amsdu->byte_count);
|
|
rx_start->byte_count = amsdu->byte_count;
|
|
rx_end = (__le32 *) (((u8 *) hdr) + len);
|
|
}
|
|
|
|
ampdu_status = le32_to_cpu(*rx_end);
|
|
skblen = ((u8 *) rx_end - (u8 *) &pkt->u.raw[0]) + sizeof(u32);
|
|
|
|
if (!include_phy) {
|
|
/* New status scheme, need to translate */
|
|
ampdu_status_legacy = ampdu_status;
|
|
ampdu_status = iwl_translate_rx_status(priv, ampdu_status);
|
|
}
|
|
|
|
/* start from MAC */
|
|
skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
|
|
skb_put(rxb->skb, len); /* end where data ends */
|
|
|
|
/* We only process data packets if the interface is open */
|
|
if (unlikely(!priv->is_open)) {
|
|
IWL_DEBUG_DROP_LIMIT
|
|
("Dropping packet while interface is not open.\n");
|
|
return;
|
|
}
|
|
|
|
hdr = (struct ieee80211_hdr *)rxb->skb->data;
|
|
|
|
/* in case of HW accelerated crypto and bad decryption, drop */
|
|
if (!priv->hw_params.sw_crypto &&
|
|
iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats))
|
|
return;
|
|
|
|
if (priv->add_radiotap)
|
|
iwl_add_radiotap(priv, rxb->skb, rx_start, stats, ampdu_status);
|
|
|
|
iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
|
|
ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
|
|
priv->alloc_rxb_skb--;
|
|
rxb->skb = NULL;
|
|
}
|
|
|
|
/* Calc max signal level (dBm) among 3 possible receivers */
|
|
static inline int iwl_calc_rssi(struct iwl_priv *priv,
|
|
struct iwl_rx_phy_res *rx_resp)
|
|
{
|
|
return priv->cfg->ops->utils->calc_rssi(priv, rx_resp);
|
|
}
|
|
|
|
|
|
static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&priv->sta_lock, flags);
|
|
priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
|
|
priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
|
|
priv->stations[sta_id].sta.sta.modify_mask = 0;
|
|
priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
|
|
spin_unlock_irqrestore(&priv->sta_lock, flags);
|
|
|
|
iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
|
|
}
|
|
|
|
static void iwl_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
|
|
{
|
|
/* FIXME: need locking over ps_status ??? */
|
|
u8 sta_id = iwl_find_station(priv, addr);
|
|
|
|
if (sta_id != IWL_INVALID_STATION) {
|
|
u8 sta_awake = priv->stations[sta_id].
|
|
ps_status == STA_PS_STATUS_WAKE;
|
|
|
|
if (sta_awake && ps_bit)
|
|
priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
|
|
else if (!sta_awake && !ps_bit) {
|
|
iwl_sta_modify_ps_wake(priv, sta_id);
|
|
priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This is necessary only for a number of statistics, see the caller. */
|
|
static int iwl_is_network_packet(struct iwl_priv *priv,
|
|
struct ieee80211_hdr *header)
|
|
{
|
|
/* Filter incoming packets to determine if they are targeted toward
|
|
* this network, discarding packets coming from ourselves */
|
|
switch (priv->iw_mode) {
|
|
case IEEE80211_IF_TYPE_IBSS: /* Header: Dest. | Source | BSSID */
|
|
/* packets to our IBSS update information */
|
|
return !compare_ether_addr(header->addr3, priv->bssid);
|
|
case IEEE80211_IF_TYPE_STA: /* Header: Dest. | AP{BSSID} | Source */
|
|
/* packets to our IBSS update information */
|
|
return !compare_ether_addr(header->addr2, priv->bssid);
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/* Called for REPLY_RX (legacy ABG frames), or
|
|
* REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
|
|
void iwl_rx_reply_rx(struct iwl_priv *priv,
|
|
struct iwl_rx_mem_buffer *rxb)
|
|
{
|
|
struct ieee80211_hdr *header;
|
|
struct ieee80211_rx_status rx_status;
|
|
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
|
|
/* Use phy data (Rx signal strength, etc.) contained within
|
|
* this rx packet for legacy frames,
|
|
* or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
|
|
int include_phy = (pkt->hdr.cmd == REPLY_RX);
|
|
struct iwl_rx_phy_res *rx_start = (include_phy) ?
|
|
(struct iwl_rx_phy_res *)&(pkt->u.raw[0]) :
|
|
(struct iwl_rx_phy_res *)&priv->last_phy_res[1];
|
|
__le32 *rx_end;
|
|
unsigned int len = 0;
|
|
u16 fc;
|
|
u8 network_packet;
|
|
|
|
rx_status.mactime = le64_to_cpu(rx_start->timestamp);
|
|
rx_status.freq =
|
|
ieee80211_channel_to_frequency(le16_to_cpu(rx_start->channel));
|
|
rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
|
|
IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
|
|
rx_status.rate_idx =
|
|
iwl_hwrate_to_plcp_idx(le32_to_cpu(rx_start->rate_n_flags));
|
|
if (rx_status.band == IEEE80211_BAND_5GHZ)
|
|
rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
|
|
|
|
rx_status.antenna = 0;
|
|
rx_status.flag = 0;
|
|
rx_status.flag |= RX_FLAG_TSFT;
|
|
|
|
if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
|
|
IWL_DEBUG_DROP("dsp size out of range [0,20]: %d/n",
|
|
rx_start->cfg_phy_cnt);
|
|
return;
|
|
}
|
|
|
|
if (!include_phy) {
|
|
if (priv->last_phy_res[0])
|
|
rx_start = (struct iwl_rx_phy_res *)
|
|
&priv->last_phy_res[1];
|
|
else
|
|
rx_start = NULL;
|
|
}
|
|
|
|
if (!rx_start) {
|
|
IWL_ERROR("MPDU frame without a PHY data\n");
|
|
return;
|
|
}
|
|
|
|
if (include_phy) {
|
|
header = (struct ieee80211_hdr *)((u8 *) &rx_start[1]
|
|
+ rx_start->cfg_phy_cnt);
|
|
|
|
len = le16_to_cpu(rx_start->byte_count);
|
|
rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
|
|
sizeof(struct iwl_rx_phy_res) + len);
|
|
} else {
|
|
struct iwl4965_rx_mpdu_res_start *amsdu =
|
|
(struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
|
|
|
|
header = (void *)(pkt->u.raw +
|
|
sizeof(struct iwl4965_rx_mpdu_res_start));
|
|
len = le16_to_cpu(amsdu->byte_count);
|
|
rx_end = (__le32 *) (pkt->u.raw +
|
|
sizeof(struct iwl4965_rx_mpdu_res_start) + len);
|
|
}
|
|
|
|
if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
|
|
!(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
|
|
IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
|
|
le32_to_cpu(*rx_end));
|
|
return;
|
|
}
|
|
|
|
priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
|
|
|
|
/* Find max signal strength (dBm) among 3 antenna/receiver chains */
|
|
rx_status.signal = iwl_calc_rssi(priv, rx_start);
|
|
|
|
/* Meaningful noise values are available only from beacon statistics,
|
|
* which are gathered only when associated, and indicate noise
|
|
* only for the associated network channel ...
|
|
* Ignore these noise values while scanning (other channels) */
|
|
if (iwl_is_associated(priv) &&
|
|
!test_bit(STATUS_SCANNING, &priv->status)) {
|
|
rx_status.noise = priv->last_rx_noise;
|
|
rx_status.qual = iwl_calc_sig_qual(rx_status.signal,
|
|
rx_status.noise);
|
|
} else {
|
|
rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
|
|
rx_status.qual = iwl_calc_sig_qual(rx_status.signal, 0);
|
|
}
|
|
|
|
/* Reset beacon noise level if not associated. */
|
|
if (!iwl_is_associated(priv))
|
|
priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
|
|
|
|
/* Set "1" to report good data frames in groups of 100 */
|
|
/* FIXME: need to optimze the call: */
|
|
iwl_dbg_report_frame(priv, pkt, header, 1);
|
|
|
|
IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
|
|
rx_status.signal, rx_status.noise, rx_status.signal,
|
|
(unsigned long long)rx_status.mactime);
|
|
|
|
/* Take shortcut when only in monitor mode */
|
|
if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR) {
|
|
iwl_pass_packet_to_mac80211(priv, include_phy,
|
|
rxb, &rx_status);
|
|
return;
|
|
}
|
|
|
|
network_packet = iwl_is_network_packet(priv, header);
|
|
if (network_packet) {
|
|
priv->last_rx_rssi = rx_status.signal;
|
|
priv->last_beacon_time = priv->ucode_beacon_time;
|
|
priv->last_tsf = le64_to_cpu(rx_start->timestamp);
|
|
}
|
|
|
|
fc = le16_to_cpu(header->frame_control);
|
|
switch (fc & IEEE80211_FCTL_FTYPE) {
|
|
case IEEE80211_FTYPE_MGMT:
|
|
case IEEE80211_FTYPE_DATA:
|
|
if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
|
|
iwl_update_ps_mode(priv, fc & IEEE80211_FCTL_PM,
|
|
header->addr2);
|
|
/* fall through */
|
|
default:
|
|
iwl_pass_packet_to_mac80211(priv, include_phy, rxb,
|
|
&rx_status);
|
|
break;
|
|
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(iwl_rx_reply_rx);
|
|
|
|
/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
|
|
* This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
|
|
void iwl_rx_reply_rx_phy(struct iwl_priv *priv,
|
|
struct iwl_rx_mem_buffer *rxb)
|
|
{
|
|
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
|
|
priv->last_phy_res[0] = 1;
|
|
memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
|
|
sizeof(struct iwl_rx_phy_res));
|
|
}
|
|
EXPORT_SYMBOL(iwl_rx_reply_rx_phy);
|