535 lines
12 KiB
C
535 lines
12 KiB
C
/*
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* Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "mt7601u.h"
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#include "dma.h"
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#include "usb.h"
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#include "trace.h"
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static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev,
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struct mt7601u_dma_buf_rx *e, gfp_t gfp);
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static unsigned int ieee80211_get_hdrlen_from_buf(const u8 *data, unsigned len)
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{
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const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)data;
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unsigned int hdrlen;
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if (unlikely(len < 10))
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return 0;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (unlikely(hdrlen > len))
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return 0;
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return hdrlen;
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}
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static struct sk_buff *
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mt7601u_rx_skb_from_seg(struct mt7601u_dev *dev, struct mt7601u_rxwi *rxwi,
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void *data, u32 seg_len, u32 truesize, struct page *p)
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{
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struct sk_buff *skb;
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u32 true_len, hdr_len = 0, copy, frag;
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skb = alloc_skb(p ? 128 : seg_len, GFP_ATOMIC);
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if (!skb)
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return NULL;
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true_len = mt76_mac_process_rx(dev, skb, data, rxwi);
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if (!true_len || true_len > seg_len)
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goto bad_frame;
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hdr_len = ieee80211_get_hdrlen_from_buf(data, true_len);
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if (!hdr_len)
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goto bad_frame;
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if (rxwi->rxinfo & cpu_to_le32(MT_RXINFO_L2PAD)) {
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skb_put_data(skb, data, hdr_len);
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data += hdr_len + 2;
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true_len -= hdr_len;
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hdr_len = 0;
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}
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/* If not doing paged RX allocated skb will always have enough space */
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copy = (true_len <= skb_tailroom(skb)) ? true_len : hdr_len + 8;
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frag = true_len - copy;
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skb_put_data(skb, data, copy);
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data += copy;
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if (frag) {
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skb_add_rx_frag(skb, 0, p, data - page_address(p),
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frag, truesize);
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get_page(p);
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}
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return skb;
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bad_frame:
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dev_err_ratelimited(dev->dev, "Error: incorrect frame len:%u hdr:%u\n",
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true_len, hdr_len);
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dev_kfree_skb(skb);
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return NULL;
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}
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static void mt7601u_rx_process_seg(struct mt7601u_dev *dev, u8 *data,
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u32 seg_len, struct page *p)
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{
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struct sk_buff *skb;
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struct mt7601u_rxwi *rxwi;
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u32 fce_info, truesize = seg_len;
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/* DMA_INFO field at the beginning of the segment contains only some of
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* the information, we need to read the FCE descriptor from the end.
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*/
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fce_info = get_unaligned_le32(data + seg_len - MT_FCE_INFO_LEN);
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seg_len -= MT_FCE_INFO_LEN;
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data += MT_DMA_HDR_LEN;
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seg_len -= MT_DMA_HDR_LEN;
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rxwi = (struct mt7601u_rxwi *) data;
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data += sizeof(struct mt7601u_rxwi);
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seg_len -= sizeof(struct mt7601u_rxwi);
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if (unlikely(rxwi->zero[0] || rxwi->zero[1] || rxwi->zero[2]))
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dev_err_once(dev->dev, "Error: RXWI zero fields are set\n");
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if (unlikely(FIELD_GET(MT_RXD_INFO_TYPE, fce_info)))
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dev_err_once(dev->dev, "Error: RX path seen a non-pkt urb\n");
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trace_mt_rx(dev, rxwi, fce_info);
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skb = mt7601u_rx_skb_from_seg(dev, rxwi, data, seg_len, truesize, p);
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if (!skb)
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return;
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spin_lock(&dev->mac_lock);
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ieee80211_rx(dev->hw, skb);
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spin_unlock(&dev->mac_lock);
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}
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static u16 mt7601u_rx_next_seg_len(u8 *data, u32 data_len)
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{
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u32 min_seg_len = MT_DMA_HDR_LEN + MT_RX_INFO_LEN +
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sizeof(struct mt7601u_rxwi) + MT_FCE_INFO_LEN;
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u16 dma_len = get_unaligned_le16(data);
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if (data_len < min_seg_len ||
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WARN_ON(!dma_len) ||
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WARN_ON(dma_len + MT_DMA_HDRS > data_len) ||
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WARN_ON(dma_len & 0x3))
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return 0;
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return MT_DMA_HDRS + dma_len;
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}
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static void
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mt7601u_rx_process_entry(struct mt7601u_dev *dev, struct mt7601u_dma_buf_rx *e)
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{
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u32 seg_len, data_len = e->urb->actual_length;
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u8 *data = page_address(e->p);
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struct page *new_p = NULL;
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int cnt = 0;
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if (!test_bit(MT7601U_STATE_INITIALIZED, &dev->state))
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return;
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/* Copy if there is very little data in the buffer. */
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if (data_len > 512)
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new_p = dev_alloc_pages(MT_RX_ORDER);
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while ((seg_len = mt7601u_rx_next_seg_len(data, data_len))) {
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mt7601u_rx_process_seg(dev, data, seg_len, new_p ? e->p : NULL);
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data_len -= seg_len;
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data += seg_len;
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cnt++;
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}
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if (cnt > 1)
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trace_mt_rx_dma_aggr(dev, cnt, !!new_p);
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if (new_p) {
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/* we have one extra ref from the allocator */
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__free_pages(e->p, MT_RX_ORDER);
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e->p = new_p;
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}
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}
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static struct mt7601u_dma_buf_rx *
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mt7601u_rx_get_pending_entry(struct mt7601u_dev *dev)
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{
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struct mt7601u_rx_queue *q = &dev->rx_q;
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struct mt7601u_dma_buf_rx *buf = NULL;
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unsigned long flags;
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spin_lock_irqsave(&dev->rx_lock, flags);
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if (!q->pending)
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goto out;
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buf = &q->e[q->start];
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q->pending--;
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q->start = (q->start + 1) % q->entries;
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out:
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spin_unlock_irqrestore(&dev->rx_lock, flags);
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return buf;
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}
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static void mt7601u_complete_rx(struct urb *urb)
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{
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struct mt7601u_dev *dev = urb->context;
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struct mt7601u_rx_queue *q = &dev->rx_q;
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unsigned long flags;
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spin_lock_irqsave(&dev->rx_lock, flags);
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if (mt7601u_urb_has_error(urb))
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dev_err(dev->dev, "Error: RX urb failed:%d\n", urb->status);
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if (WARN_ONCE(q->e[q->end].urb != urb, "RX urb mismatch"))
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goto out;
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q->end = (q->end + 1) % q->entries;
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q->pending++;
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tasklet_schedule(&dev->rx_tasklet);
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out:
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spin_unlock_irqrestore(&dev->rx_lock, flags);
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}
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static void mt7601u_rx_tasklet(unsigned long data)
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{
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struct mt7601u_dev *dev = (struct mt7601u_dev *) data;
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struct mt7601u_dma_buf_rx *e;
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while ((e = mt7601u_rx_get_pending_entry(dev))) {
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if (e->urb->status)
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continue;
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mt7601u_rx_process_entry(dev, e);
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mt7601u_submit_rx_buf(dev, e, GFP_ATOMIC);
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}
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}
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static void mt7601u_complete_tx(struct urb *urb)
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{
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struct mt7601u_tx_queue *q = urb->context;
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struct mt7601u_dev *dev = q->dev;
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struct sk_buff *skb;
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unsigned long flags;
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spin_lock_irqsave(&dev->tx_lock, flags);
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if (mt7601u_urb_has_error(urb))
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dev_err(dev->dev, "Error: TX urb failed:%d\n", urb->status);
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if (WARN_ONCE(q->e[q->start].urb != urb, "TX urb mismatch"))
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goto out;
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skb = q->e[q->start].skb;
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trace_mt_tx_dma_done(dev, skb);
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__skb_queue_tail(&dev->tx_skb_done, skb);
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tasklet_schedule(&dev->tx_tasklet);
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if (q->used == q->entries - q->entries / 8)
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ieee80211_wake_queue(dev->hw, skb_get_queue_mapping(skb));
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q->start = (q->start + 1) % q->entries;
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q->used--;
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out:
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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}
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static void mt7601u_tx_tasklet(unsigned long data)
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{
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struct mt7601u_dev *dev = (struct mt7601u_dev *) data;
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struct sk_buff_head skbs;
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unsigned long flags;
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__skb_queue_head_init(&skbs);
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spin_lock_irqsave(&dev->tx_lock, flags);
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set_bit(MT7601U_STATE_MORE_STATS, &dev->state);
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if (!test_and_set_bit(MT7601U_STATE_READING_STATS, &dev->state))
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queue_delayed_work(dev->stat_wq, &dev->stat_work,
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msecs_to_jiffies(10));
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skb_queue_splice_init(&dev->tx_skb_done, &skbs);
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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while (!skb_queue_empty(&skbs)) {
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struct sk_buff *skb = __skb_dequeue(&skbs);
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mt7601u_tx_status(dev, skb);
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}
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}
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static int mt7601u_dma_submit_tx(struct mt7601u_dev *dev,
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struct sk_buff *skb, u8 ep)
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{
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struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
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unsigned snd_pipe = usb_sndbulkpipe(usb_dev, dev->out_eps[ep]);
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struct mt7601u_dma_buf_tx *e;
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struct mt7601u_tx_queue *q = &dev->tx_q[ep];
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&dev->tx_lock, flags);
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if (WARN_ON(q->entries <= q->used)) {
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ret = -ENOSPC;
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goto out;
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}
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e = &q->e[q->end];
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e->skb = skb;
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usb_fill_bulk_urb(e->urb, usb_dev, snd_pipe, skb->data, skb->len,
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mt7601u_complete_tx, q);
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ret = usb_submit_urb(e->urb, GFP_ATOMIC);
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if (ret) {
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/* Special-handle ENODEV from TX urb submission because it will
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* often be the first ENODEV we see after device is removed.
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*/
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if (ret == -ENODEV)
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set_bit(MT7601U_STATE_REMOVED, &dev->state);
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else
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dev_err(dev->dev, "Error: TX urb submit failed:%d\n",
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ret);
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goto out;
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}
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q->end = (q->end + 1) % q->entries;
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q->used++;
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if (q->used >= q->entries)
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ieee80211_stop_queue(dev->hw, skb_get_queue_mapping(skb));
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out:
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spin_unlock_irqrestore(&dev->tx_lock, flags);
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return ret;
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}
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/* Map hardware Q to USB endpoint number */
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static u8 q2ep(u8 qid)
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{
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/* TODO: take management packets to queue 5 */
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return qid + 1;
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}
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/* Map USB endpoint number to Q id in the DMA engine */
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static enum mt76_qsel ep2dmaq(u8 ep)
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{
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if (ep == 5)
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return MT_QSEL_MGMT;
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return MT_QSEL_EDCA;
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}
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int mt7601u_dma_enqueue_tx(struct mt7601u_dev *dev, struct sk_buff *skb,
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struct mt76_wcid *wcid, int hw_q)
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{
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u8 ep = q2ep(hw_q);
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u32 dma_flags;
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int ret;
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dma_flags = MT_TXD_PKT_INFO_80211;
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if (wcid->hw_key_idx == 0xff)
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dma_flags |= MT_TXD_PKT_INFO_WIV;
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ret = mt7601u_dma_skb_wrap_pkt(skb, ep2dmaq(ep), dma_flags);
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if (ret)
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return ret;
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ret = mt7601u_dma_submit_tx(dev, skb, ep);
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if (ret) {
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ieee80211_free_txskb(dev->hw, skb);
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return ret;
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}
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return 0;
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}
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static void mt7601u_kill_rx(struct mt7601u_dev *dev)
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{
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int i;
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unsigned long flags;
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spin_lock_irqsave(&dev->rx_lock, flags);
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for (i = 0; i < dev->rx_q.entries; i++) {
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int next = dev->rx_q.end;
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spin_unlock_irqrestore(&dev->rx_lock, flags);
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usb_poison_urb(dev->rx_q.e[next].urb);
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spin_lock_irqsave(&dev->rx_lock, flags);
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}
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spin_unlock_irqrestore(&dev->rx_lock, flags);
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}
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static int mt7601u_submit_rx_buf(struct mt7601u_dev *dev,
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struct mt7601u_dma_buf_rx *e, gfp_t gfp)
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{
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struct usb_device *usb_dev = mt7601u_to_usb_dev(dev);
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u8 *buf = page_address(e->p);
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unsigned pipe;
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int ret;
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pipe = usb_rcvbulkpipe(usb_dev, dev->in_eps[MT_EP_IN_PKT_RX]);
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usb_fill_bulk_urb(e->urb, usb_dev, pipe, buf, MT_RX_URB_SIZE,
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mt7601u_complete_rx, dev);
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trace_mt_submit_urb(dev, e->urb);
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ret = usb_submit_urb(e->urb, gfp);
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if (ret)
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dev_err(dev->dev, "Error: submit RX URB failed:%d\n", ret);
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return ret;
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}
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static int mt7601u_submit_rx(struct mt7601u_dev *dev)
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{
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int i, ret;
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for (i = 0; i < dev->rx_q.entries; i++) {
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ret = mt7601u_submit_rx_buf(dev, &dev->rx_q.e[i], GFP_KERNEL);
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if (ret)
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return ret;
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}
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return 0;
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}
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static void mt7601u_free_rx(struct mt7601u_dev *dev)
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{
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int i;
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for (i = 0; i < dev->rx_q.entries; i++) {
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__free_pages(dev->rx_q.e[i].p, MT_RX_ORDER);
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usb_free_urb(dev->rx_q.e[i].urb);
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}
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}
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static int mt7601u_alloc_rx(struct mt7601u_dev *dev)
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{
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int i;
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memset(&dev->rx_q, 0, sizeof(dev->rx_q));
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dev->rx_q.dev = dev;
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dev->rx_q.entries = N_RX_ENTRIES;
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for (i = 0; i < N_RX_ENTRIES; i++) {
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dev->rx_q.e[i].urb = usb_alloc_urb(0, GFP_KERNEL);
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dev->rx_q.e[i].p = dev_alloc_pages(MT_RX_ORDER);
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if (!dev->rx_q.e[i].urb || !dev->rx_q.e[i].p)
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return -ENOMEM;
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}
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return 0;
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}
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static void mt7601u_free_tx_queue(struct mt7601u_tx_queue *q)
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{
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int i;
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WARN_ON(q->used);
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for (i = 0; i < q->entries; i++) {
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usb_poison_urb(q->e[i].urb);
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usb_free_urb(q->e[i].urb);
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}
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}
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static void mt7601u_free_tx(struct mt7601u_dev *dev)
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{
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int i;
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if (!dev->tx_q)
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return;
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for (i = 0; i < __MT_EP_OUT_MAX; i++)
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mt7601u_free_tx_queue(&dev->tx_q[i]);
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}
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static int mt7601u_alloc_tx_queue(struct mt7601u_dev *dev,
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struct mt7601u_tx_queue *q)
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{
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int i;
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q->dev = dev;
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q->entries = N_TX_ENTRIES;
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for (i = 0; i < N_TX_ENTRIES; i++) {
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q->e[i].urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!q->e[i].urb)
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return -ENOMEM;
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}
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return 0;
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}
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static int mt7601u_alloc_tx(struct mt7601u_dev *dev)
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{
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int i;
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dev->tx_q = devm_kcalloc(dev->dev, __MT_EP_OUT_MAX,
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sizeof(*dev->tx_q), GFP_KERNEL);
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if (!dev->tx_q)
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return -ENOMEM;
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for (i = 0; i < __MT_EP_OUT_MAX; i++)
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if (mt7601u_alloc_tx_queue(dev, &dev->tx_q[i]))
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return -ENOMEM;
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return 0;
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}
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int mt7601u_dma_init(struct mt7601u_dev *dev)
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{
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int ret = -ENOMEM;
|
|
|
|
tasklet_init(&dev->tx_tasklet, mt7601u_tx_tasklet, (unsigned long) dev);
|
|
tasklet_init(&dev->rx_tasklet, mt7601u_rx_tasklet, (unsigned long) dev);
|
|
|
|
ret = mt7601u_alloc_tx(dev);
|
|
if (ret)
|
|
goto err;
|
|
ret = mt7601u_alloc_rx(dev);
|
|
if (ret)
|
|
goto err;
|
|
|
|
ret = mt7601u_submit_rx(dev);
|
|
if (ret)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
mt7601u_dma_cleanup(dev);
|
|
return ret;
|
|
}
|
|
|
|
void mt7601u_dma_cleanup(struct mt7601u_dev *dev)
|
|
{
|
|
mt7601u_kill_rx(dev);
|
|
|
|
tasklet_kill(&dev->rx_tasklet);
|
|
|
|
mt7601u_free_rx(dev);
|
|
mt7601u_free_tx(dev);
|
|
|
|
tasklet_kill(&dev->tx_tasklet);
|
|
}
|