343 lines
8.8 KiB
C
343 lines
8.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/gfp.h>
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#include <linux/sched.h>
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#include "wlcore.h"
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#include "debug.h"
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#include "acx.h"
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#include "rx.h"
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#include "tx.h"
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#include "io.h"
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#include "hw_ops.h"
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/*
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* TODO: this is here just for now, it must be removed when the data
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* operations are in place.
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*/
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#include "../wl12xx/reg.h"
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static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
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u32 rx_pkt_desc)
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{
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if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
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return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >>
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ALIGNED_RX_BUF_SIZE_SHIFT;
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return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
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}
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static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
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{
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if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
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return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);
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return pkt_len;
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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, u8 probe_rsp)
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{
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memset(status, 0, sizeof(struct ieee80211_rx_status));
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if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
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status->band = NL80211_BAND_2GHZ;
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else
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status->band = NL80211_BAND_5GHZ;
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status->rate_idx = wlcore_rate_to_idx(wl, desc->rate, status->band);
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/* 11n support */
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if (desc->rate <= wl->hw_min_ht_rate)
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status->encoding = RX_ENC_HT;
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/*
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* Read the signal level and antenna diversity indication.
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* The msb in the signal level is always set as it is a
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* negative number.
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* The antenna indication is the msb of the rssi.
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*/
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status->signal = ((desc->rssi & RSSI_LEVEL_BITMASK) | BIT(7));
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status->antenna = ((desc->rssi & ANT_DIVERSITY_BITMASK) >> 7);
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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,
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status->band);
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if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
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u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;
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status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
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RX_FLAG_DECRYPTED;
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if (unlikely(desc_err_code & WL1271_RX_DESC_MIC_FAIL)) {
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status->flag |= RX_FLAG_MMIC_ERROR;
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wl1271_warning("Michael MIC error. Desc: 0x%x",
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desc_err_code);
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}
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}
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if (beacon || probe_rsp)
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status->boottime_ns = ktime_get_boottime_ns();
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if (beacon)
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wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
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status->band);
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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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enum wl_rx_buf_align rx_align, u8 *hlid)
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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 beacon = 0;
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u8 is_data = 0;
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u8 reserved = 0, offset_to_data = 0;
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u16 seq_num;
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u32 pkt_data_len;
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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->plt))
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return -EINVAL;
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pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
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if (!pkt_data_len) {
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wl1271_error("Invalid packet arrived from HW. length %d",
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length);
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return -EINVAL;
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}
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if (rx_align == WLCORE_RX_BUF_UNALIGNED)
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reserved = RX_BUF_ALIGN;
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else if (rx_align == WLCORE_RX_BUF_PADDED)
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offset_to_data = RX_BUF_ALIGN;
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/* the data read starts with the descriptor */
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desc = (struct wl1271_rx_descriptor *) data;
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if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
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size_t len = length - sizeof(*desc);
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wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
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return 0;
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}
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/* discard corrupted packets */
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if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
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hdr = (void *)(data + sizeof(*desc) + offset_to_data);
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wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
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desc->status & WL1271_RX_DESC_STATUS_MASK,
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pkt_data_len);
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wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
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min(pkt_data_len,
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ieee80211_hdrlen(hdr->frame_control)));
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return -EINVAL;
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}
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/* skb length not including rx descriptor */
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skb = __dev_alloc_skb(pkt_data_len + reserved, 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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/* reserve the unaligned payload(if any) */
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skb_reserve(skb, reserved);
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/*
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* Copy packets from aggregation buffer to the skbs without rx
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* descriptor and with packet payload aligned care. In case of unaligned
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* packets copy the packets in offset of 2 bytes guarantee IP header
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* payload aligned to 4 bytes.
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*/
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skb_put_data(skb, data + sizeof(*desc), pkt_data_len);
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if (rx_align == WLCORE_RX_BUF_PADDED)
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skb_pull(skb, RX_BUF_ALIGN);
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*hlid = desc->hlid;
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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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if (ieee80211_is_data_present(hdr->frame_control))
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is_data = 1;
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wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon,
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ieee80211_is_probe_resp(hdr->frame_control));
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wlcore_hw_set_rx_csum(wl, desc, skb);
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seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
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wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d hlid %d", skb,
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skb->len - desc->pad_len,
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beacon ? "beacon" : "",
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seq_num, *hlid);
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skb_queue_tail(&wl->deferred_rx_queue, skb);
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queue_work(wl->freezable_wq, &wl->netstack_work);
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return is_data;
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}
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int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
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{
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unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
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u32 buf_size;
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u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
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u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
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u32 rx_counter;
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u32 pkt_len, align_pkt_len;
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u32 pkt_offset, des;
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u8 hlid;
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enum wl_rx_buf_align rx_align;
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int ret = 0;
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/* update rates per link */
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hlid = status->counters.hlid;
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if (hlid < WLCORE_MAX_LINKS)
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wl->links[hlid].fw_rate_mbps =
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status->counters.tx_last_rate_mbps;
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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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des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
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pkt_len = wlcore_rx_get_buf_size(wl, des);
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align_pkt_len = wlcore_rx_get_align_buf_size(wl,
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pkt_len);
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if (buf_size + align_pkt_len > wl->aggr_buf_size)
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break;
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buf_size += align_pkt_len;
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rx_counter++;
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rx_counter %= wl->num_rx_desc;
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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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/* Read all available packets at once */
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des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
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ret = wlcore_hw_prepare_read(wl, des, buf_size);
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if (ret < 0)
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goto out;
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ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
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buf_size, true);
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if (ret < 0)
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goto out;
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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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des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
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pkt_len = wlcore_rx_get_buf_size(wl, des);
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rx_align = wlcore_hw_get_rx_buf_align(wl, des);
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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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if (wl1271_rx_handle_data(wl,
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wl->aggr_buf + pkt_offset,
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pkt_len, rx_align,
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&hlid) == 1) {
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if (hlid < wl->num_links)
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__set_bit(hlid, active_hlids);
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else
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WARN(1,
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"hlid (%d) exceeded MAX_LINKS\n",
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hlid);
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}
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wl->rx_counter++;
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drv_rx_counter++;
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drv_rx_counter %= wl->num_rx_desc;
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pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
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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 & WLCORE_QUIRK_END_OF_TRANSACTION) {
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ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
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wl->rx_counter);
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if (ret < 0)
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goto out;
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}
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wl12xx_rearm_rx_streaming(wl, active_hlids);
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out:
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return ret;
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}
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#ifdef CONFIG_PM
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int wl1271_rx_filter_enable(struct wl1271 *wl,
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int index, bool enable,
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struct wl12xx_rx_filter *filter)
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{
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int ret;
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if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
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wl1271_warning("Request to enable an already "
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"enabled rx filter %d", index);
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return 0;
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}
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ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);
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if (ret) {
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wl1271_error("Failed to %s rx data filter %d (err=%d)",
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enable ? "enable" : "disable", index, ret);
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return ret;
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}
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if (enable)
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__set_bit(index, wl->rx_filter_enabled);
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else
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__clear_bit(index, wl->rx_filter_enabled);
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return 0;
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}
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int wl1271_rx_filter_clear_all(struct wl1271 *wl)
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{
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int i, ret = 0;
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for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
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if (!test_bit(i, wl->rx_filter_enabled))
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continue;
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ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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#endif /* CONFIG_PM */
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