--- /dev/null
+/*
+ * carl9170 firmware - used by the ar9170 wireless device
+ *
+ * WLAN receive routines
+ *
+ * Copyright (c) 2000-2005 ZyDAS Technology Corporation
+ * Copyright (c) 2007-2009 Atheros Communications, Inc.
+ * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2009-2012 Christian Lamparter <chunkeey@googlemail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "carl9170.h"
+#include "shared/phy.h"
+#include "hostif.h"
+#include "timer.h"
+#include "wl.h"
+#include "printf.h"
+#include "rf.h"
+#include "linux/ieee80211.h"
+#include "wol.h"
+
+static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
+{
+ struct carl9170_bar_ctx *tmp;
+
+ tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx];
+ fw.wlan.ba_tail_idx++;
+ fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
+ if (fw.wlan.queued_ba < CONFIG_CARL9170FW_BACK_REQS_NUM)
+ fw.wlan.queued_ba++;
+
+ return tmp;
+}
+
+static void handle_bar(struct dma_desc *desc __unused, struct ieee80211_hdr *hdr,
+ unsigned int len, unsigned int mac_err)
+{
+ struct ieee80211_bar *bar;
+ struct carl9170_bar_ctx *ctx;
+
+ if (unlikely(mac_err)) {
+ /*
+ * This check does a number of things:
+ * 1. checks if the frame is in good nick
+ * 2. checks if the RA (MAC) matches
+ */
+ return ;
+ }
+
+ if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
+ /*
+ * Sneaky, corrupted BARs... but not with us!
+ */
+
+ return ;
+ }
+
+ bar = (void *) hdr;
+
+ if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
+ !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
+ /* not implemented yet */
+
+ return ;
+ }
+
+ ctx = wlan_get_bar_cache_buffer();
+
+ memcpy(ctx->ra, bar->ra, 6);
+ memcpy(ctx->ta, bar->ta, 6);
+ ctx->control = bar->control;
+ ctx->start_seq_num = bar->start_seq_num;
+}
+
+static unsigned int wlan_rx_filter(struct dma_desc *desc)
+{
+ struct ieee80211_hdr *hdr;
+ unsigned int data_len;
+ unsigned int rx_filter;
+ unsigned int mac_err;
+
+ data_len = ar9170_get_rx_mpdu_len(desc);
+ mac_err = ar9170_get_rx_macstatus_error(desc);
+
+#define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
+
+ if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
+ desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
+ mac_err & AR9170_RX_ERROR_BAD) {
+ /*
+ * This frame is too damaged to do anything
+ * useful with it.
+ */
+
+ return CARL9170_RX_FILTER_BAD;
+ }
+
+ rx_filter = 0;
+ if (mac_err & AR9170_RX_ERROR_WRONG_RA)
+ rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
+
+ if (mac_err & AR9170_RX_ERROR_DECRYPT)
+ rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
+
+ hdr = ar9170_get_rx_i3e(desc);
+ if (likely(ieee80211_is_data(hdr->frame_control))) {
+ rx_filter |= CARL9170_RX_FILTER_DATA;
+ } else if (ieee80211_is_ctl(hdr->frame_control)) {
+ switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
+ case IEEE80211_STYPE_BACK_REQ:
+ handle_bar(desc, hdr, data_len, mac_err);
+ rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
+ break;
+ case IEEE80211_STYPE_PSPOLL:
+ rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
+ break;
+ case IEEE80211_STYPE_BACK:
+ if (fw.wlan.queued_bar) {
+ /*
+ * Don't filter block acks when the application
+ * has queued BARs. This is because the firmware
+ * can't do the accouting and the application
+ * has to sort out if the BA belongs to any BARs.
+ */
+ break;
+ }
+ /* otherwise fall through */
+ default:
+ rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
+ break;
+ }
+ } else {
+ /* ieee80211_is_mgmt */
+ rx_filter |= CARL9170_RX_FILTER_MGMT;
+ }
+
+ if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
+ wol_rx(rx_filter, hdr, min(data_len,
+ (unsigned int)AR9170_BLOCK_SIZE));
+ }
+
+#undef AR9170_RX_ERROR_BAD
+
+ return rx_filter;
+}
+
+void handle_wlan_rx(void)
+{
+ struct dma_desc *desc;
+
+ for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
+ if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
+ dma_put(&fw.pta.up_queue, desc);
+ up_trigger();
+ } else {
+ dma_reclaim(&fw.wlan.rx_queue, desc);
+ wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
+ }
+ }
+}
projects / carl9170fw.git / blobdiff