/* * This file is part of wl1271 * * Copyright (C) 2009 Nokia Corporation * * Contact: Luciano Coelho * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * 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 St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include #include #include "wlcore.h" #include "debug.h" #include "acx.h" #include "rx.h" #include "tx.h" #include "io.h" #include "hw_ops.h" /* * TODO: this is here just for now, it must be removed when the data * operations are in place. */ #include "../wl12xx/reg.h" static u32 wlcore_rx_get_buf_size(struct wl1271 *wl, u32 rx_pkt_desc) { if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >> ALIGNED_RX_BUF_SIZE_SHIFT; return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV; } static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len) { if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN) return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE); return pkt_len; } static void wl1271_rx_status(struct wl1271 *wl, struct wl1271_rx_descriptor *desc, struct ieee80211_rx_status *status, u8 beacon) { memset(status, 0, sizeof(struct ieee80211_rx_status)); if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG) status->band = IEEE80211_BAND_2GHZ; else status->band = IEEE80211_BAND_5GHZ; status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band); /* 11n support */ if (desc->rate <= wl->hw_min_ht_rate) status->flag |= RX_FLAG_HT; status->signal = desc->rssi; /* * FIXME: In wl1251, the SNR should be divided by two. In wl1271 we * need to divide by two for now, but TI has been discussing about * changing it. This needs to be rechecked. */ wl->noise = desc->rssi - (desc->snr >> 1); status->freq = ieee80211_channel_to_frequency(desc->channel, status->band); if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) { u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK; status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED | RX_FLAG_DECRYPTED; if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) { status->flag |= RX_FLAG_MMIC_ERROR; wl1271_warning("Michael MIC error"); } } } static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length, enum wl_rx_buf_align rx_align, u8 *hlid) { struct wl1271_rx_descriptor *desc; struct sk_buff *skb; struct ieee80211_hdr *hdr; u8 *buf; u8 beacon = 0; u8 is_data = 0; u8 reserved = 0; u16 seq_num; u32 pkt_data_len; /* * In PLT mode we seem to get frames and mac80211 warns about them, * workaround this by not retrieving them at all. */ if (unlikely(wl->plt)) return -EINVAL; pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length); if (!pkt_data_len) { wl1271_error("Invalid packet arrived from HW. length %d", length); return -EINVAL; } if (rx_align == WLCORE_RX_BUF_UNALIGNED) reserved = NET_IP_ALIGN; /* the data read starts with the descriptor */ desc = (struct wl1271_rx_descriptor *) data; if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) { size_t len = length - sizeof(*desc); wl12xx_copy_fwlog(wl, data + sizeof(*desc), len); wake_up_interruptible(&wl->fwlog_waitq); return 0; } switch (desc->status & WL1271_RX_DESC_STATUS_MASK) { /* discard corrupted packets */ case WL1271_RX_DESC_DRIVER_RX_Q_FAIL: case WL1271_RX_DESC_DECRYPT_FAIL: wl1271_warning("corrupted packet in RX with status: 0x%x", desc->status & WL1271_RX_DESC_STATUS_MASK); return -EINVAL; case WL1271_RX_DESC_SUCCESS: case WL1271_RX_DESC_MIC_FAIL: break; default: wl1271_error("invalid RX descriptor status: 0x%x", desc->status & WL1271_RX_DESC_STATUS_MASK); return -EINVAL; } /* skb length not including rx descriptor */ skb = __dev_alloc_skb(pkt_data_len + reserved, GFP_KERNEL); if (!skb) { wl1271_error("Couldn't allocate RX frame"); return -ENOMEM; } /* reserve the unaligned payload(if any) */ skb_reserve(skb, reserved); buf = skb_put(skb, pkt_data_len); /* * Copy packets from aggregation buffer to the skbs without rx * descriptor and with packet payload aligned care. In case of unaligned * packets copy the packets in offset of 2 bytes guarantee IP header * payload aligned to 4 bytes. */ memcpy(buf, data + sizeof(*desc), pkt_data_len); if (rx_align == WLCORE_RX_BUF_PADDED) skb_pull(skb, NET_IP_ALIGN); *hlid = desc->hlid; hdr = (struct ieee80211_hdr *)skb->data; if (ieee80211_is_beacon(hdr->frame_control)) beacon = 1; if (ieee80211_is_data_present(hdr->frame_control)) is_data = 1; wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon); seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4; wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb, skb->len - desc->pad_len, beacon ? "beacon" : "", seq_num, *hlid); skb_queue_tail(&wl->deferred_rx_queue, skb); queue_work(wl->freezable_wq, &wl->netstack_work); return is_data; } void wl12xx_rx(struct wl1271 *wl, struct wl_fw_status *status) { unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0}; u32 buf_size; u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK; u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK; u32 rx_counter; u32 pkt_len, align_pkt_len; u32 pkt_offset, des; u8 hlid; enum wl_rx_buf_align rx_align; while (drv_rx_counter != fw_rx_counter) { buf_size = 0; rx_counter = drv_rx_counter; while (rx_counter != fw_rx_counter) { des = le32_to_cpu(status->rx_pkt_descs[rx_counter]); pkt_len = wlcore_rx_get_buf_size(wl, des); align_pkt_len = wlcore_rx_get_align_buf_size(wl, pkt_len); if (buf_size + align_pkt_len > WL1271_AGGR_BUFFER_SIZE) break; buf_size += align_pkt_len; rx_counter++; rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; } if (buf_size == 0) { wl1271_warning("received empty data"); break; } /* Read all available packets at once */ des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); wlcore_hw_prepare_read(wl, des, buf_size); wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf, buf_size, true); /* Split data into separate packets */ pkt_offset = 0; while (pkt_offset < buf_size) { des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]); pkt_len = wlcore_rx_get_buf_size(wl, des); rx_align = wlcore_hw_get_rx_buf_align(wl, des); /* * the handle data call can only fail in memory-outage * conditions, in that case the received frame will just * be dropped. */ if (wl1271_rx_handle_data(wl, wl->aggr_buf + pkt_offset, pkt_len, rx_align, &hlid) == 1) { if (hlid < WL12XX_MAX_LINKS) __set_bit(hlid, active_hlids); else WARN(1, "hlid exceeded WL12XX_MAX_LINKS " "(%d)\n", hlid); } wl->rx_counter++; drv_rx_counter++; drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK; pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len); } } /* * Write the driver's packet counter to the FW. This is only required * for older hardware revisions */ if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) wl1271_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER, wl->rx_counter); wl12xx_rearm_rx_streaming(wl, active_hlids); }