a620865edf
To achieve maximal throughput, it is very important to react to interrupts as soon as possible. Currently the interrupt handler wakes up a worker for handling interrupts in process context. A cleaner and more efficient design would be to request a threaded interrupt handler. This handler's priority is very high, and can do blocking operations such as SDIO/SPI transactions. Some work can be deferred, mostly calls to mac80211 APIs (ieee80211_rx_ni and ieee80211_tx_status). By deferring such work to a different worker, we can keep the irq handler thread more I/O responsive. In addition, on multi-core systems the two threads can be scheduled on different cores, which will improve overall performance. The use of WL1271_FLAG_IRQ_PENDING & WL1271_FLAG_IRQ_RUNNING was changed. For simplicity, always query the FW for more pending interrupts. Since there are relatively long bursts of interrupts, the extra FW status read overhead is negligible. In addition, this enables registering the IRQ handler with the ONESHOT option. Signed-off-by: Ido Yariv <ido@wizery.com> Reviewed-by: Luciano Coelho <coelho@ti.com> Signed-off-by: Luciano Coelho <coelho@ti.com>
220 lines
6.1 KiB
C
220 lines
6.1 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as 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
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/gfp.h>
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#include "wl12xx.h"
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#include "acx.h"
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#include "reg.h"
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#include "rx.h"
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#include "io.h"
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static u8 wl1271_rx_get_mem_block(struct wl1271_fw_common_status *status,
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u32 drv_rx_counter)
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{
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return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
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RX_MEM_BLOCK_MASK;
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}
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static u32 wl1271_rx_get_buf_size(struct wl1271_fw_common_status *status,
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u32 drv_rx_counter)
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{
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return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
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RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
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}
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static void wl1271_rx_status(struct wl1271 *wl,
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struct wl1271_rx_descriptor *desc,
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struct ieee80211_rx_status *status,
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u8 beacon)
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{
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enum ieee80211_band desc_band;
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memset(status, 0, sizeof(struct ieee80211_rx_status));
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status->band = wl->band;
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if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
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desc_band = IEEE80211_BAND_2GHZ;
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else
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desc_band = IEEE80211_BAND_5GHZ;
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status->rate_idx = wl1271_rate_to_idx(desc->rate, desc_band);
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#ifdef CONFIG_WL12XX_HT
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/* 11n support */
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if (desc->rate <= CONF_HW_RXTX_RATE_MCS0)
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status->flag |= RX_FLAG_HT;
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#endif
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status->signal = desc->rssi;
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/*
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* FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
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* need to divide by two for now, but TI has been discussing about
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* changing it. This needs to be rechecked.
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*/
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wl->noise = desc->rssi - (desc->snr >> 1);
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status->freq = ieee80211_channel_to_frequency(desc->channel, desc_band);
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if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
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status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED;
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if (likely(!(desc->status & WL1271_RX_DESC_DECRYPT_FAIL)))
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status->flag |= RX_FLAG_DECRYPTED;
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if (unlikely(desc->status & WL1271_RX_DESC_MIC_FAIL))
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status->flag |= RX_FLAG_MMIC_ERROR;
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}
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}
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static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length)
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{
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struct wl1271_rx_descriptor *desc;
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struct sk_buff *skb;
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struct ieee80211_hdr *hdr;
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u8 *buf;
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u8 beacon = 0;
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/*
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* In PLT mode we seem to get frames and mac80211 warns about them,
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* workaround this by not retrieving them at all.
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*/
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if (unlikely(wl->state == WL1271_STATE_PLT))
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return -EINVAL;
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skb = __dev_alloc_skb(length, GFP_KERNEL);
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if (!skb) {
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wl1271_error("Couldn't allocate RX frame");
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return -ENOMEM;
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}
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buf = skb_put(skb, length);
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memcpy(buf, data, length);
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/* the data read starts with the descriptor */
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desc = (struct wl1271_rx_descriptor *) buf;
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/* now we pull the descriptor out of the buffer */
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skb_pull(skb, sizeof(*desc));
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hdr = (struct ieee80211_hdr *)skb->data;
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if (ieee80211_is_beacon(hdr->frame_control))
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beacon = 1;
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wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);
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wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s", skb, skb->len,
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beacon ? "beacon" : "");
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skb_trim(skb, skb->len - desc->pad_len);
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skb_queue_tail(&wl->deferred_rx_queue, skb);
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ieee80211_queue_work(wl->hw, &wl->netstack_work);
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return 0;
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}
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void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_common_status *status)
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{
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struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
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u32 buf_size;
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u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
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u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
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u32 rx_counter;
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u32 mem_block;
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u32 pkt_length;
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u32 pkt_offset;
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while (drv_rx_counter != fw_rx_counter) {
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buf_size = 0;
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rx_counter = drv_rx_counter;
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while (rx_counter != fw_rx_counter) {
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pkt_length = wl1271_rx_get_buf_size(status, rx_counter);
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if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE)
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break;
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buf_size += pkt_length;
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rx_counter++;
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rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
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}
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if (buf_size == 0) {
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wl1271_warning("received empty data");
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break;
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}
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/*
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* Choose the block we want to read
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* For aggregated packets, only the first memory block should
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* be retrieved. The FW takes care of the rest.
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*/
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mem_block = wl1271_rx_get_mem_block(status, drv_rx_counter);
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wl->rx_mem_pool_addr.addr = (mem_block << 8) +
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le32_to_cpu(wl_mem_map->packet_memory_pool_start);
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wl->rx_mem_pool_addr.addr_extra =
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wl->rx_mem_pool_addr.addr + 4;
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wl1271_write(wl, WL1271_SLV_REG_DATA, &wl->rx_mem_pool_addr,
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sizeof(wl->rx_mem_pool_addr), false);
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/* Read all available packets at once */
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wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
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buf_size, true);
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/* Split data into separate packets */
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pkt_offset = 0;
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while (pkt_offset < buf_size) {
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pkt_length = wl1271_rx_get_buf_size(status,
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drv_rx_counter);
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/*
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* the handle data call can only fail in memory-outage
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* conditions, in that case the received frame will just
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* be dropped.
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*/
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wl1271_rx_handle_data(wl,
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wl->aggr_buf + pkt_offset,
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pkt_length);
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wl->rx_counter++;
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drv_rx_counter++;
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drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
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pkt_offset += pkt_length;
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}
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}
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/*
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* Write the driver's packet counter to the FW. This is only required
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* for older hardware revisions
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*/
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if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
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wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);
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}
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void wl1271_set_default_filters(struct wl1271 *wl)
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{
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if (wl->bss_type == BSS_TYPE_AP_BSS) {
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wl->rx_config = WL1271_DEFAULT_AP_RX_CONFIG;
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wl->rx_filter = WL1271_DEFAULT_AP_RX_FILTER;
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} else {
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wl->rx_config = WL1271_DEFAULT_STA_RX_CONFIG;
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wl->rx_filter = WL1271_DEFAULT_STA_RX_FILTER;
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}
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}
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