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/*
* Copyright (c) 2014 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "wil6210.h"
#include "txrx.h"
#define SEQ_MODULO 0x1000
#define SEQ_MASK 0xfff
static inline int seq_less(u16 sq1, u16 sq2)
{
return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
}
static inline u16 seq_inc(u16 sq)
{
return (sq + 1) & SEQ_MASK;
}
static inline u16 seq_sub(u16 sq1, u16 sq2)
{
return (sq1 - sq2) & SEQ_MASK;
}
static inline int reorder_index(struct wil_tid_ampdu_rx *r, u16 seq)
{
return seq_sub(seq, r->ssn) % r->buf_size;
}
static void wil_release_reorder_frame(struct wil6210_priv *wil,
struct wil_tid_ampdu_rx *r,
int index)
{
struct net_device *ndev = wil_to_ndev(wil);
struct sk_buff *skb = r->reorder_buf[index];
if (!skb)
goto no_frame;
/* release the frame from the reorder ring buffer */
r->stored_mpdu_num--;
r->reorder_buf[index] = NULL;
wil_netif_rx_any(skb, ndev);
no_frame:
r->head_seq_num = seq_inc(r->head_seq_num);
}
static void wil_release_reorder_frames(struct wil6210_priv *wil,
struct wil_tid_ampdu_rx *r,
u16 hseq)
{
int index;
/* note: this function is never called with
* hseq preceding r->head_seq_num, i.e it is always true
* !seq_less(hseq, r->head_seq_num)
* and thus on loop exit it should be
* r->head_seq_num == hseq
*/
while (seq_less(r->head_seq_num, hseq) && r->stored_mpdu_num) {
index = reorder_index(r, r->head_seq_num);
wil_release_reorder_frame(wil, r, index);
}
r->head_seq_num = hseq;
}
static void wil_reorder_release(struct wil6210_priv *wil,
struct wil_tid_ampdu_rx *r)
{
int index = reorder_index(r, r->head_seq_num);
while (r->reorder_buf[index]) {
wil_release_reorder_frame(wil, r, index);
index = reorder_index(r, r->head_seq_num);
}
}
void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
{
struct net_device *ndev = wil_to_ndev(wil);
struct vring_rx_desc *d = wil_skb_rxdesc(skb);
int tid = wil_rxdesc_tid(d);
int cid = wil_rxdesc_cid(d);
int mid = wil_rxdesc_mid(d);
u16 seq = wil_rxdesc_seq(d);
struct wil_sta_info *sta = &wil->sta[cid];
struct wil_tid_ampdu_rx *r;
u16 hseq;
int index;
unsigned long flags;
wil_dbg_txrx(wil, "MID %d CID %d TID %d Seq 0x%03x\n",
mid, cid, tid, seq);
spin_lock_irqsave(&sta->tid_rx_lock, flags);
r = sta->tid_rx[tid];
if (!r) {
spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
wil_netif_rx_any(skb, ndev);
return;
}
hseq = r->head_seq_num;
/** Due to the race between WMI events, where BACK establishment
* reported, and data Rx, few packets may be pass up before reorder
* buffer get allocated. Catch up by pretending SSN is what we
* see in the 1-st Rx packet
*/
if (r->first_time) {
r->first_time = false;
if (seq != r->head_seq_num) {
wil_err(wil, "Error: 1-st frame with wrong sequence"
" %d, should be %d. Fixing...\n", seq,
r->head_seq_num);
r->head_seq_num = seq;
r->ssn = seq;
}
}
/* frame with out of date sequence number */
if (seq_less(seq, r->head_seq_num)) {
r->ssn_last_drop = seq;
dev_kfree_skb(skb);
goto out;
}
/*
* If frame the sequence number exceeds our buffering window
* size release some previous frames to make room for this one.
*/
if (!seq_less(seq, r->head_seq_num + r->buf_size)) {
hseq = seq_inc(seq_sub(seq, r->buf_size));
/* release stored frames up to new head to stack */
wil_release_reorder_frames(wil, r, hseq);
}
/* Now the new frame is always in the range of the reordering buffer */
index = reorder_index(r, seq);
/* check if we already stored this frame */
if (r->reorder_buf[index]) {
dev_kfree_skb(skb);
goto out;
}
/*
* If the current MPDU is in the right order and nothing else
* is stored we can process it directly, no need to buffer it.
* If it is first but there's something stored, we may be able
* to release frames after this one.
*/
if (seq == r->head_seq_num && r->stored_mpdu_num == 0) {
r->head_seq_num = seq_inc(r->head_seq_num);
wil_netif_rx_any(skb, ndev);
goto out;
}
/* put the frame in the reordering buffer */
r->reorder_buf[index] = skb;
r->reorder_time[index] = jiffies;
r->stored_mpdu_num++;
wil_reorder_release(wil, r);
out:
spin_unlock_irqrestore(&sta->tid_rx_lock, flags);
}
struct wil_tid_ampdu_rx *wil_tid_ampdu_rx_alloc(struct wil6210_priv *wil,
int size, u16 ssn)
{
struct wil_tid_ampdu_rx *r = kzalloc(sizeof(*r), GFP_KERNEL);
if (!r)
return NULL;
r->reorder_buf =
kcalloc(size, sizeof(struct sk_buff *), GFP_KERNEL);
r->reorder_time =
kcalloc(size, sizeof(unsigned long), GFP_KERNEL);
if (!r->reorder_buf || !r->reorder_time) {
kfree(r->reorder_buf);
kfree(r->reorder_time);
kfree(r);
return NULL;
}
r->ssn = ssn;
r->head_seq_num = ssn;
r->buf_size = size;
r->stored_mpdu_num = 0;
r->first_time = true;
return r;
}
void wil_tid_ampdu_rx_free(struct wil6210_priv *wil,
struct wil_tid_ampdu_rx *r)
{
if (!r)
return;
wil_release_reorder_frames(wil, r, r->head_seq_num + r->buf_size);
kfree(r->reorder_buf);
kfree(r->reorder_time);
kfree(r);
}
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