396 lines
10 KiB
C
396 lines
10 KiB
C
/*
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* Copyright (c) 2014-2016 Qualcomm Atheros, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "wil6210.h"
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#include "txrx.h"
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#define SEQ_MODULO 0x1000
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#define SEQ_MASK 0xfff
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static inline int seq_less(u16 sq1, u16 sq2)
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{
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return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
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}
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static inline u16 seq_inc(u16 sq)
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{
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return (sq + 1) & SEQ_MASK;
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}
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static inline u16 seq_sub(u16 sq1, u16 sq2)
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{
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return (sq1 - sq2) & SEQ_MASK;
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}
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static inline int reorder_index(struct wil_tid_ampdu_rx *r, u16 seq)
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{
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return seq_sub(seq, r->ssn) % r->buf_size;
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}
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static void wil_release_reorder_frame(struct wil6210_priv *wil,
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struct wil_tid_ampdu_rx *r,
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int index)
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{
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struct net_device *ndev = wil_to_ndev(wil);
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struct sk_buff *skb = r->reorder_buf[index];
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if (!skb)
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goto no_frame;
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/* release the frame from the reorder ring buffer */
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r->stored_mpdu_num--;
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r->reorder_buf[index] = NULL;
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wil_netif_rx_any(skb, ndev);
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no_frame:
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r->head_seq_num = seq_inc(r->head_seq_num);
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}
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static void wil_release_reorder_frames(struct wil6210_priv *wil,
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struct wil_tid_ampdu_rx *r,
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u16 hseq)
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{
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int index;
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/* note: this function is never called with
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* hseq preceding r->head_seq_num, i.e it is always true
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* !seq_less(hseq, r->head_seq_num)
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* and thus on loop exit it should be
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* r->head_seq_num == hseq
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*/
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while (seq_less(r->head_seq_num, hseq) && r->stored_mpdu_num) {
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index = reorder_index(r, r->head_seq_num);
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wil_release_reorder_frame(wil, r, index);
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}
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r->head_seq_num = hseq;
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}
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static void wil_reorder_release(struct wil6210_priv *wil,
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struct wil_tid_ampdu_rx *r)
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{
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int index = reorder_index(r, r->head_seq_num);
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while (r->reorder_buf[index]) {
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wil_release_reorder_frame(wil, r, index);
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index = reorder_index(r, r->head_seq_num);
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}
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}
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/* called in NAPI context */
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void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
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__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
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{
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struct net_device *ndev = wil_to_ndev(wil);
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struct vring_rx_desc *d = wil_skb_rxdesc(skb);
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int tid = wil_rxdesc_tid(d);
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int cid = wil_rxdesc_cid(d);
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int mid = wil_rxdesc_mid(d);
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u16 seq = wil_rxdesc_seq(d);
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int mcast = wil_rxdesc_mcast(d);
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struct wil_sta_info *sta = &wil->sta[cid];
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struct wil_tid_ampdu_rx *r;
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u16 hseq;
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int index;
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wil_dbg_txrx(wil, "MID %d CID %d TID %d Seq 0x%03x mcast %01x\n",
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mid, cid, tid, seq, mcast);
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if (unlikely(mcast)) {
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wil_netif_rx_any(skb, ndev);
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return;
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}
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spin_lock(&sta->tid_rx_lock);
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r = sta->tid_rx[tid];
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if (!r) {
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wil_netif_rx_any(skb, ndev);
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goto out;
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}
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r->total++;
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hseq = r->head_seq_num;
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/** Due to the race between WMI events, where BACK establishment
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* reported, and data Rx, few packets may be pass up before reorder
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* buffer get allocated. Catch up by pretending SSN is what we
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* see in the 1-st Rx packet
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*
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* Another scenario, Rx get delayed and we got packet from before
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* BACK. Pass it to the stack and wait.
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*/
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if (r->first_time) {
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r->first_time = false;
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if (seq != r->head_seq_num) {
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if (seq_less(seq, r->head_seq_num)) {
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wil_err(wil,
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"Error: frame with early sequence 0x%03x, should be 0x%03x. Waiting...\n",
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seq, r->head_seq_num);
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r->first_time = true;
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wil_netif_rx_any(skb, ndev);
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goto out;
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}
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wil_err(wil,
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"Error: 1-st frame with wrong sequence 0x%03x, should be 0x%03x. Fixing...\n",
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seq, r->head_seq_num);
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r->head_seq_num = seq;
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r->ssn = seq;
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}
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}
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/* frame with out of date sequence number */
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if (seq_less(seq, r->head_seq_num)) {
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r->ssn_last_drop = seq;
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r->drop_old++;
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wil_dbg_txrx(wil, "Rx drop: old seq 0x%03x head 0x%03x\n",
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seq, r->head_seq_num);
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dev_kfree_skb(skb);
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goto out;
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}
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/*
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* If frame the sequence number exceeds our buffering window
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* size release some previous frames to make room for this one.
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*/
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if (!seq_less(seq, r->head_seq_num + r->buf_size)) {
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hseq = seq_inc(seq_sub(seq, r->buf_size));
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/* release stored frames up to new head to stack */
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wil_release_reorder_frames(wil, r, hseq);
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}
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/* Now the new frame is always in the range of the reordering buffer */
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index = reorder_index(r, seq);
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/* check if we already stored this frame */
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if (r->reorder_buf[index]) {
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r->drop_dup++;
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wil_dbg_txrx(wil, "Rx drop: dup seq 0x%03x\n", seq);
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dev_kfree_skb(skb);
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goto out;
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}
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/*
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* If the current MPDU is in the right order and nothing else
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* is stored we can process it directly, no need to buffer it.
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* If it is first but there's something stored, we may be able
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* to release frames after this one.
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*/
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if (seq == r->head_seq_num && r->stored_mpdu_num == 0) {
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r->head_seq_num = seq_inc(r->head_seq_num);
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wil_netif_rx_any(skb, ndev);
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goto out;
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}
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/* put the frame in the reordering buffer */
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r->reorder_buf[index] = skb;
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r->reorder_time[index] = jiffies;
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r->stored_mpdu_num++;
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wil_reorder_release(wil, r);
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out:
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spin_unlock(&sta->tid_rx_lock);
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}
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/* process BAR frame, called in NAPI context */
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void wil_rx_bar(struct wil6210_priv *wil, u8 cid, u8 tid, u16 seq)
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{
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struct wil_sta_info *sta = &wil->sta[cid];
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struct wil_tid_ampdu_rx *r;
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spin_lock(&sta->tid_rx_lock);
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r = sta->tid_rx[tid];
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if (!r) {
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wil_err(wil, "BAR for non-existing CID %d TID %d\n", cid, tid);
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goto out;
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}
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if (seq_less(seq, r->head_seq_num)) {
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wil_err(wil, "BAR Seq 0x%03x preceding head 0x%03x\n",
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seq, r->head_seq_num);
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goto out;
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}
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wil_dbg_txrx(wil, "BAR: CID %d TID %d Seq 0x%03x head 0x%03x\n",
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cid, tid, seq, r->head_seq_num);
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wil_release_reorder_frames(wil, r, seq);
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out:
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spin_unlock(&sta->tid_rx_lock);
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}
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struct wil_tid_ampdu_rx *wil_tid_ampdu_rx_alloc(struct wil6210_priv *wil,
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int size, u16 ssn)
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{
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struct wil_tid_ampdu_rx *r = kzalloc(sizeof(*r), GFP_KERNEL);
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if (!r)
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return NULL;
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r->reorder_buf =
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kcalloc(size, sizeof(struct sk_buff *), GFP_KERNEL);
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r->reorder_time =
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kcalloc(size, sizeof(unsigned long), GFP_KERNEL);
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if (!r->reorder_buf || !r->reorder_time) {
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kfree(r->reorder_buf);
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kfree(r->reorder_time);
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kfree(r);
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return NULL;
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}
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r->ssn = ssn;
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r->head_seq_num = ssn;
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r->buf_size = size;
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r->stored_mpdu_num = 0;
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r->first_time = true;
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return r;
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}
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void wil_tid_ampdu_rx_free(struct wil6210_priv *wil,
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struct wil_tid_ampdu_rx *r)
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{
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int i;
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if (!r)
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return;
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/* Do not pass remaining frames to the network stack - it may be
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* not expecting to get any more Rx. Rx from here may lead to
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* kernel OOPS since some per-socket accounting info was already
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* released.
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*/
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for (i = 0; i < r->buf_size; i++)
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kfree_skb(r->reorder_buf[i]);
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kfree(r->reorder_buf);
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kfree(r->reorder_time);
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kfree(r);
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}
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/* ADDBA processing */
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static u16 wil_agg_size(struct wil6210_priv *wil, u16 req_agg_wsize)
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{
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u16 max_agg_size = min_t(u16, WIL_MAX_AGG_WSIZE, WIL_MAX_AMPDU_SIZE /
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(mtu_max + WIL_MAX_MPDU_OVERHEAD));
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if (!req_agg_wsize)
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return max_agg_size;
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return min(max_agg_size, req_agg_wsize);
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}
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/* Block Ack - Rx side (recipient) */
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int wil_addba_rx_request(struct wil6210_priv *wil, u8 cidxtid,
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u8 dialog_token, __le16 ba_param_set,
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__le16 ba_timeout, __le16 ba_seq_ctrl)
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__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
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{
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u16 param_set = le16_to_cpu(ba_param_set);
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u16 agg_timeout = le16_to_cpu(ba_timeout);
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u16 seq_ctrl = le16_to_cpu(ba_seq_ctrl);
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struct wil_sta_info *sta;
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u8 cid, tid;
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u16 agg_wsize = 0;
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/* bit 0: A-MSDU supported
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* bit 1: policy (should be 0 for us)
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* bits 2..5: TID
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* bits 6..15: buffer size
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*/
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u16 req_agg_wsize = WIL_GET_BITS(param_set, 6, 15);
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bool agg_amsdu = !!(param_set & BIT(0));
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int ba_policy = param_set & BIT(1);
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u16 status = WLAN_STATUS_SUCCESS;
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u16 ssn = seq_ctrl >> 4;
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struct wil_tid_ampdu_rx *r;
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int rc = 0;
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might_sleep();
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parse_cidxtid(cidxtid, &cid, &tid);
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/* sanity checks */
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if (cid >= WIL6210_MAX_CID) {
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wil_err(wil, "BACK: invalid CID %d\n", cid);
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rc = -EINVAL;
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goto out;
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}
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sta = &wil->sta[cid];
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if (sta->status != wil_sta_connected) {
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wil_err(wil, "BACK: CID %d not connected\n", cid);
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rc = -EINVAL;
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goto out;
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}
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wil_dbg_wmi(wil,
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"ADDBA request for CID %d %pM TID %d size %d timeout %d AMSDU%s policy %d token %d SSN 0x%03x\n",
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cid, sta->addr, tid, req_agg_wsize, agg_timeout,
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agg_amsdu ? "+" : "-", !!ba_policy, dialog_token, ssn);
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/* apply policies */
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if (ba_policy) {
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wil_err(wil, "BACK requested unsupported ba_policy == 1\n");
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status = WLAN_STATUS_INVALID_QOS_PARAM;
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}
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if (status == WLAN_STATUS_SUCCESS)
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agg_wsize = wil_agg_size(wil, req_agg_wsize);
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rc = wmi_addba_rx_resp(wil, cid, tid, dialog_token, status,
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agg_amsdu, agg_wsize, agg_timeout);
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if (rc || (status != WLAN_STATUS_SUCCESS)) {
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wil_err(wil, "%s: do not apply ba, rc(%d), status(%d)\n",
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__func__, rc, status);
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goto out;
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}
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/* apply */
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r = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn);
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spin_lock_bh(&sta->tid_rx_lock);
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wil_tid_ampdu_rx_free(wil, sta->tid_rx[tid]);
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sta->tid_rx[tid] = r;
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spin_unlock_bh(&sta->tid_rx_lock);
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out:
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return rc;
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}
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/* BACK - Tx side (originator) */
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int wil_addba_tx_request(struct wil6210_priv *wil, u8 ringid, u16 wsize)
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{
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u8 agg_wsize = wil_agg_size(wil, wsize);
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u16 agg_timeout = 0;
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struct vring_tx_data *txdata = &wil->vring_tx_data[ringid];
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int rc = 0;
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if (txdata->addba_in_progress) {
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wil_dbg_misc(wil, "ADDBA for vring[%d] already in progress\n",
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ringid);
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goto out;
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}
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if (txdata->agg_wsize) {
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wil_dbg_misc(wil,
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"ADDBA for vring[%d] already done for wsize %d\n",
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ringid, txdata->agg_wsize);
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goto out;
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}
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txdata->addba_in_progress = true;
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rc = wmi_addba(wil, ringid, agg_wsize, agg_timeout);
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if (rc) {
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wil_err(wil, "%s: wmi_addba failed, rc (%d)", __func__, rc);
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txdata->addba_in_progress = false;
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}
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out:
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return rc;
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}
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