LXR linux/drivers/net/wireless/ath/wil6210/rx

   1// SPDX-License-Identifier: ISC
   2/*
   3 * Copyright (c) 2014-2017 Qualcomm Atheros, Inc.
   4 * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
   5 */
   6
   7#include "wil6210.h"
   8#include "txrx.h"
   9
  10#define SEQ_MODULO 0x1000
  11#define SEQ_MASK   0xfff
  12
  13static inline int seq_less(u16 sq1, u16 sq2)
  14{
  15        return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1);
  16}
  17
  18static inline u16 seq_inc(u16 sq)
  19{
  20        return (sq + 1) & SEQ_MASK;
  21}
  22
  23static inline u16 seq_sub(u16 sq1, u16 sq2)
  24{
  25        return (sq1 - sq2) & SEQ_MASK;
  26}
  27
  28static inline int reorder_index(struct wil_tid_ampdu_rx *r, u16 seq)
  29{
  30        return seq_sub(seq, r->ssn) % r->buf_size;
  31}
  32
  33static void wil_release_reorder_frame(struct net_device *ndev,
  34                                      struct wil_tid_ampdu_rx *r,
  35                                      int index)
  36{
  37        struct sk_buff *skb = r->reorder_buf[index];
  38
  39        if (!skb)
  40                goto no_frame;
  41
  42        /* release the frame from the reorder ring buffer */
  43        r->stored_mpdu_num--;
  44        r->reorder_buf[index] = NULL;
  45        wil_netif_rx_any(skb, ndev);
  46
  47no_frame:
  48        r->head_seq_num = seq_inc(r->head_seq_num);
  49}
  50
  51static void wil_release_reorder_frames(struct net_device *ndev,
  52                                       struct wil_tid_ampdu_rx *r,
  53                                       u16 hseq)
  54{
  55        int index;
  56
  57        /* note: this function is never called with
  58         * hseq preceding r->head_seq_num, i.e it is always true
  59         * !seq_less(hseq, r->head_seq_num)
  60         * and thus on loop exit it should be
  61         * r->head_seq_num == hseq
  62         */
  63        while (seq_less(r->head_seq_num, hseq) && r->stored_mpdu_num) {
  64                index = reorder_index(r, r->head_seq_num);
  65                wil_release_reorder_frame(ndev, r, index);
  66        }
  67        r->head_seq_num = hseq;
  68}
  69
  70static void wil_reorder_release(struct net_device *ndev,
  71                                struct wil_tid_ampdu_rx *r)
  72{
  73        int index = reorder_index(r, r->head_seq_num);
  74
  75        while (r->reorder_buf[index]) {
  76                wil_release_reorder_frame(ndev, r, index);
  77                index = reorder_index(r, r->head_seq_num);
  78        }
  79}
  80
  81/* called in NAPI context */
  82void wil_rx_reorder(struct wil6210_priv *wil, struct sk_buff *skb)
  83__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
  84{
  85        struct wil6210_vif *vif;
  86        struct net_device *ndev;
  87        int tid, cid, mid, mcast, retry;
  88        u16 seq;
  89        struct wil_sta_info *sta;
  90        struct wil_tid_ampdu_rx *r;
  91        u16 hseq;
  92        int index;
  93
  94        wil->txrx_ops.get_reorder_params(wil, skb, &tid, &cid, &mid, &seq,
  95                                         &mcast, &retry);
  96        sta = &wil->sta[cid];
  97
  98        wil_dbg_txrx(wil, "MID %d CID %d TID %d Seq 0x%03x mcast %01x\n",
  99                     mid, cid, tid, seq, mcast);
 100
 101        vif = wil->vifs[mid];
 102        if (unlikely(!vif)) {
 103                wil_dbg_txrx(wil, "invalid VIF, mid %d\n", mid);
 104                dev_kfree_skb(skb);
 105                return;
 106        }
 107        ndev = vif_to_ndev(vif);
 108
 109        spin_lock(&sta->tid_rx_lock);
 110
 111        r = sta->tid_rx[tid];
 112        if (!r) {
 113                wil_netif_rx_any(skb, ndev);
 114                goto out;
 115        }
 116
 117        if (unlikely(mcast)) {
 118                if (retry && seq == r->mcast_last_seq) {
 119                        r->drop_dup_mcast++;
 120                        wil_dbg_txrx(wil, "Rx drop: dup mcast seq 0x%03x\n",
 121                                     seq);
 122                        dev_kfree_skb(skb);
 123                        goto out;
 124                }
 125                r->mcast_last_seq = seq;
 126                wil_netif_rx_any(skb, ndev);
 127                goto out;
 128        }
 129
 130        r->total++;
 131        hseq = r->head_seq_num;
 132
 133        /** Due to the race between WMI events, where BACK establishment
 134         * reported, and data Rx, few packets may be pass up before reorder
 135         * buffer get allocated. Catch up by pretending SSN is what we
 136         * see in the 1-st Rx packet
 137         *
 138         * Another scenario, Rx get delayed and we got packet from before
 139         * BACK. Pass it to the stack and wait.
 140         */
 141        if (r->first_time) {
 142                r->first_time = false;
 143                if (seq != r->head_seq_num) {
 144                        if (seq_less(seq, r->head_seq_num)) {
 145                                wil_err(wil,
 146                                        "Error: frame with early sequence 0x%03x, should be 0x%03x. Waiting...\n",
 147                                        seq, r->head_seq_num);
 148                                r->first_time = true;
 149                                wil_netif_rx_any(skb, ndev);
 150                                goto out;
 151                        }
 152                        wil_err(wil,
 153                                "Error: 1-st frame with wrong sequence 0x%03x, should be 0x%03x. Fixing...\n",
 154                                seq, r->head_seq_num);
 155                        r->head_seq_num = seq;
 156                        r->ssn = seq;
 157                }
 158        }
 159
 160        /* frame with out of date sequence number */
 161        if (seq_less(seq, r->head_seq_num)) {
 162                r->ssn_last_drop = seq;
 163                r->drop_old++;
 164                wil_dbg_txrx(wil, "Rx drop: old seq 0x%03x head 0x%03x\n",
 165                             seq, r->head_seq_num);
 166                dev_kfree_skb(skb);
 167                goto out;
 168        }
 169
 170        /*
 171         * If frame the sequence number exceeds our buffering window
 172         * size release some previous frames to make room for this one.
 173         */
 174        if (!seq_less(seq, r->head_seq_num + r->buf_size)) {
 175                hseq = seq_inc(seq_sub(seq, r->buf_size));
 176                /* release stored frames up to new head to stack */
 177                wil_release_reorder_frames(ndev, r, hseq);
 178        }
 179
 180        /* Now the new frame is always in the range of the reordering buffer */
 181
 182        index = reorder_index(r, seq);
 183
 184        /* check if we already stored this frame */
 185        if (r->reorder_buf[index]) {
 186                r->drop_dup++;
 187                wil_dbg_txrx(wil, "Rx drop: dup seq 0x%03x\n", seq);
 188                dev_kfree_skb(skb);
 189                goto out;
 190        }
 191
 192        /*
 193         * If the current MPDU is in the right order and nothing else
 194         * is stored we can process it directly, no need to buffer it.
 195         * If it is first but there's something stored, we may be able
 196         * to release frames after this one.
 197         */
 198        if (seq == r->head_seq_num && r->stored_mpdu_num == 0) {
 199                r->head_seq_num = seq_inc(r->head_seq_num);
 200                wil_netif_rx_any(skb, ndev);
 201                goto out;
 202        }
 203
 204        /* put the frame in the reordering buffer */
 205        r->reorder_buf[index] = skb;
 206        r->stored_mpdu_num++;
 207        wil_reorder_release(ndev, r);
 208
 209out:
 210        spin_unlock(&sta->tid_rx_lock);
 211}
 212
 213/* process BAR frame, called in NAPI context */
 214void wil_rx_bar(struct wil6210_priv *wil, struct wil6210_vif *vif,
 215                u8 cid, u8 tid, u16 seq)
 216{
 217        struct wil_sta_info *sta = &wil->sta[cid];
 218        struct net_device *ndev = vif_to_ndev(vif);
 219        struct wil_tid_ampdu_rx *r;
 220
 221        spin_lock(&sta->tid_rx_lock);
 222
 223        r = sta->tid_rx[tid];
 224        if (!r) {
 225                wil_err(wil, "BAR for non-existing CID %d TID %d\n", cid, tid);
 226                goto out;
 227        }
 228        if (seq_less(seq, r->head_seq_num)) {
 229                wil_err(wil, "BAR Seq 0x%03x preceding head 0x%03x\n",
 230                        seq, r->head_seq_num);
 231                goto out;
 232        }
 233        wil_dbg_txrx(wil, "BAR: CID %d MID %d TID %d Seq 0x%03x head 0x%03x\n",
 234                     cid, vif->mid, tid, seq, r->head_seq_num);
 235        wil_release_reorder_frames(ndev, r, seq);
 236
 237out:
 238        spin_unlock(&sta->tid_rx_lock);
 239}
 240
 241struct wil_tid_ampdu_rx *wil_tid_ampdu_rx_alloc(struct wil6210_priv *wil,
 242                                                int size, u16 ssn)
 243{
 244        struct wil_tid_ampdu_rx *r = kzalloc(sizeof(*r), GFP_KERNEL);
 245
 246        if (!r)
 247                return NULL;
 248
 249        r->reorder_buf =
 250                kcalloc(size, sizeof(struct sk_buff *), GFP_KERNEL);
 251        if (!r->reorder_buf) {
 252                kfree(r);
 253                return NULL;
 254        }
 255
 256        r->ssn = ssn;
 257        r->head_seq_num = ssn;
 258        r->buf_size = size;
 259        r->stored_mpdu_num = 0;
 260        r->first_time = true;
 261        r->mcast_last_seq = U16_MAX;
 262        return r;
 263}
 264
 265void wil_tid_ampdu_rx_free(struct wil6210_priv *wil,
 266                           struct wil_tid_ampdu_rx *r)
 267{
 268        int i;
 269
 270        if (!r)
 271                return;
 272
 273        /* Do not pass remaining frames to the network stack - it may be
 274         * not expecting to get any more Rx. Rx from here may lead to
 275         * kernel OOPS since some per-socket accounting info was already
 276         * released.
 277         */
 278        for (i = 0; i < r->buf_size; i++)
 279                kfree_skb(r->reorder_buf[i]);
 280
 281        kfree(r->reorder_buf);
 282        kfree(r);
 283}
 284
 285/* ADDBA processing */
 286static u16 wil_agg_size(struct wil6210_priv *wil, u16 req_agg_wsize)
 287{
 288        u16 max_agg_size = min_t(u16, wil->max_agg_wsize, wil->max_ampdu_size /
 289                                 (mtu_max + WIL_MAX_MPDU_OVERHEAD));
 290
 291        if (!req_agg_wsize)
 292                return max_agg_size;
 293
 294        return min(max_agg_size, req_agg_wsize);
 295}
 296
 297/* Block Ack - Rx side (recipient) */
 298int wil_addba_rx_request(struct wil6210_priv *wil, u8 mid, u8 cid, u8 tid,
 299                         u8 dialog_token, __le16 ba_param_set,
 300                         __le16 ba_timeout, __le16 ba_seq_ctrl)
 301__acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
 302{
 303        u16 param_set = le16_to_cpu(ba_param_set);
 304        u16 agg_timeout = le16_to_cpu(ba_timeout);
 305        u16 seq_ctrl = le16_to_cpu(ba_seq_ctrl);
 306        struct wil_sta_info *sta;
 307        u16 agg_wsize;
 308        /* bit 0: A-MSDU supported
 309         * bit 1: policy (should be 0 for us)
 310         * bits 2..5: TID
 311         * bits 6..15: buffer size
 312         */
 313        u16 req_agg_wsize = WIL_GET_BITS(param_set, 6, 15);
 314        bool agg_amsdu = wil->use_enhanced_dma_hw &&
 315                wil->use_rx_hw_reordering &&
 316                test_bit(WMI_FW_CAPABILITY_AMSDU, wil->fw_capabilities) &&
 317                wil->amsdu_en && (param_set & BIT(0));
 318        int ba_policy = param_set & BIT(1);
 319        u16 ssn = seq_ctrl >> 4;
 320        struct wil_tid_ampdu_rx *r;
 321        int rc = 0;
 322
 323        might_sleep();
 324
 325        /* sanity checks */
 326        if (cid >= wil->max_assoc_sta) {
 327                wil_err(wil, "BACK: invalid CID %d\n", cid);
 328                rc = -EINVAL;
 329                goto out;
 330        }
 331
 332        sta = &wil->sta[cid];
 333        if (sta->status != wil_sta_connected) {
 334                wil_err(wil, "BACK: CID %d not connected\n", cid);
 335                rc = -EINVAL;
 336                goto out;
 337        }
 338
 339        wil_dbg_wmi(wil,
 340                    "ADDBA request for CID %d %pM TID %d size %d timeout %d AMSDU%s policy %d token %d SSN 0x%03x\n",
 341                    cid, sta->addr, tid, req_agg_wsize, agg_timeout,
 342                    agg_amsdu ? "+" : "-", !!ba_policy, dialog_token, ssn);
 343
 344        /* apply policies */
 345        if (req_agg_wsize == 0) {
 346                wil_dbg_misc(wil, "Suggest BACK wsize %d\n",
 347                             wil->max_agg_wsize);
 348                agg_wsize = wil->max_agg_wsize;
 349        } else {
 350                agg_wsize = min_t(u16, wil->max_agg_wsize, req_agg_wsize);
 351        }
 352
 353        rc = wil->txrx_ops.wmi_addba_rx_resp(wil, mid, cid, tid, dialog_token,
 354                                             WLAN_STATUS_SUCCESS, agg_amsdu,
 355                                             agg_wsize, agg_timeout);
 356        if (rc) {
 357                wil_err(wil, "do not apply ba, rc(%d)\n", rc);
 358                goto out;
 359        }
 360
 361        /* apply */
 362        if (!wil->use_rx_hw_reordering) {
 363                r = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn);
 364                spin_lock_bh(&sta->tid_rx_lock);
 365                wil_tid_ampdu_rx_free(wil, sta->tid_rx[tid]);
 366                sta->tid_rx[tid] = r;
 367                spin_unlock_bh(&sta->tid_rx_lock);
 368        }
 369
 370out:
 371        return rc;
 372}
 373
 374/* BACK - Tx side (originator) */
 375int wil_addba_tx_request(struct wil6210_priv *wil, u8 ringid, u16 wsize)
 376{
 377        u8 agg_wsize = wil_agg_size(wil, wsize);
 378        u16 agg_timeout = 0;
 379        struct wil_ring_tx_data *txdata = &wil->ring_tx_data[ringid];
 380        int rc = 0;
 381
 382        if (txdata->addba_in_progress) {
 383                wil_dbg_misc(wil, "ADDBA for vring[%d] already in progress\n",
 384                             ringid);
 385                goto out;
 386        }
 387        if (txdata->agg_wsize) {
 388                wil_dbg_misc(wil,
 389                             "ADDBA for vring[%d] already done for wsize %d\n",
 390                             ringid, txdata->agg_wsize);
 391                goto out;
 392        }
 393        txdata->addba_in_progress = true;
 394        rc = wmi_addba(wil, txdata->mid, ringid, agg_wsize, agg_timeout);
 395        if (rc) {
 396                wil_err(wil, "wmi_addba failed, rc (%d)", rc);
 397                txdata->addba_in_progress = false;
 398        }
 399
 400out:
 401        return rc;
 402}
 403