drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * This contains the functions to handle the descriptors for DesignWare databook
   4  * 4.xx.
   5  *
   6  * Copyright (C) 2015  STMicroelectronics Ltd
   7  *
   8  * Author: Alexandre Torgue <alexandre.torgue@st.com>
   9  */
  10
  11 #include <linux/stmmac.h>
  12 #include "common.h"
  13 #include "dwmac4.h"
  14 #include "dwmac4_descs.h"
  15
  16 static int dwmac4_wrback_get_tx_status(void *data, struct stmmac_extra_stats *x,
  17                                        struct dma_desc *p,
  18                                        void __iomem *ioaddr)
  19 {
  20         struct net_device_stats *stats = (struct net_device_stats *)data;
  21         unsigned int tdes3;
  22         int ret = tx_done;
  23
  24         tdes3 = le32_to_cpu(p->des3);
  25
  26         /* Get tx owner first */
  27         if (unlikely(tdes3 & TDES3_OWN))
  28                 return tx_dma_own;
  29
  30         /* Verify tx error by looking at the last segment. */
  31         if (likely(!(tdes3 & TDES3_LAST_DESCRIPTOR)))
  32                 return tx_not_ls;
  33
  34         if (unlikely(tdes3 & TDES3_ERROR_SUMMARY)) {
  35                 if (unlikely(tdes3 & TDES3_JABBER_TIMEOUT))
  36                         x->tx_jabber++;
  37                 if (unlikely(tdes3 & TDES3_PACKET_FLUSHED))
  38                         x->tx_frame_flushed++;
  39                 if (unlikely(tdes3 & TDES3_LOSS_CARRIER)) {
  40                         x->tx_losscarrier++;
  41                         stats->tx_carrier_errors++;
  42                 }
  43                 if (unlikely(tdes3 & TDES3_NO_CARRIER)) {
  44                         x->tx_carrier++;
  45                         stats->tx_carrier_errors++;
  46                 }
  47                 if (unlikely((tdes3 & TDES3_LATE_COLLISION) ||
  48                              (tdes3 & TDES3_EXCESSIVE_COLLISION)))
  49                         stats->collisions +=
  50                             (tdes3 & TDES3_COLLISION_COUNT_MASK)
  51                             >> TDES3_COLLISION_COUNT_SHIFT;
  52
  53                 if (unlikely(tdes3 & TDES3_EXCESSIVE_DEFERRAL))
  54                         x->tx_deferred++;
  55
  56                 if (unlikely(tdes3 & TDES3_UNDERFLOW_ERROR))
  57                         x->tx_underflow++;
  58
  59                 if (unlikely(tdes3 & TDES3_IP_HDR_ERROR))
  60                         x->tx_ip_header_error++;
  61
  62                 if (unlikely(tdes3 & TDES3_PAYLOAD_ERROR))
  63                         x->tx_payload_error++;
  64
  65                 ret = tx_err;
  66         }
  67
  68         if (unlikely(tdes3 & TDES3_DEFERRED))
  69                 x->tx_deferred++;
  70
  71         return ret;
  72 }
  73
  74 static int dwmac4_wrback_get_rx_status(void *data, struct stmmac_extra_stats *x,
  75                                        struct dma_desc *p)
  76 {
  77         struct net_device_stats *stats = (struct net_device_stats *)data;
  78         unsigned int rdes1 = le32_to_cpu(p->des1);
  79         unsigned int rdes2 = le32_to_cpu(p->des2);
  80         unsigned int rdes3 = le32_to_cpu(p->des3);
  81         int message_type;
  82         int ret = good_frame;
  83
  84         if (unlikely(rdes3 & RDES3_OWN))
  85                 return dma_own;
  86
  87         if (unlikely(rdes3 & RDES3_CONTEXT_DESCRIPTOR))
  88                 return discard_frame;
  89         if (likely(!(rdes3 & RDES3_LAST_DESCRIPTOR)))
  90                 return rx_not_ls;
  91
  92         if (unlikely(rdes3 & RDES3_ERROR_SUMMARY)) {
  93                 if (unlikely(rdes3 & RDES3_GIANT_PACKET))
  94                         stats->rx_length_errors++;
  95                 if (unlikely(rdes3 & RDES3_OVERFLOW_ERROR))
  96                         x->rx_gmac_overflow++;
  97
  98                 if (unlikely(rdes3 & RDES3_RECEIVE_WATCHDOG))
  99                         x->rx_watchdog++;
 100
 101                 if (unlikely(rdes3 & RDES3_RECEIVE_ERROR))
 102                         x->rx_mii++;
 103
 104                 if (unlikely(rdes3 & RDES3_CRC_ERROR)) {
 105                         x->rx_crc_errors++;
 106                         stats->rx_crc_errors++;
 107                 }
 108
 109                 if (unlikely(rdes3 & RDES3_DRIBBLE_ERROR))
 110                         x->dribbling_bit++;
 111
 112                 ret = discard_frame;
 113         }
 114
 115         message_type = (rdes1 & ERDES4_MSG_TYPE_MASK) >> 8;
 116
 117         if (rdes1 & RDES1_IP_HDR_ERROR)
 118                 x->ip_hdr_err++;
 119         if (rdes1 & RDES1_IP_CSUM_BYPASSED)
 120                 x->ip_csum_bypassed++;
 121         if (rdes1 & RDES1_IPV4_HEADER)
 122                 x->ipv4_pkt_rcvd++;
 123         if (rdes1 & RDES1_IPV6_HEADER)
 124                 x->ipv6_pkt_rcvd++;
 125
 126         if (message_type == RDES_EXT_NO_PTP)
 127                 x->no_ptp_rx_msg_type_ext++;
 128         else if (message_type == RDES_EXT_SYNC)
 129                 x->ptp_rx_msg_type_sync++;
 130         else if (message_type == RDES_EXT_FOLLOW_UP)
 131                 x->ptp_rx_msg_type_follow_up++;
 132         else if (message_type == RDES_EXT_DELAY_REQ)
 133                 x->ptp_rx_msg_type_delay_req++;
 134         else if (message_type == RDES_EXT_DELAY_RESP)
 135                 x->ptp_rx_msg_type_delay_resp++;
 136         else if (message_type == RDES_EXT_PDELAY_REQ)
 137                 x->ptp_rx_msg_type_pdelay_req++;
 138         else if (message_type == RDES_EXT_PDELAY_RESP)
 139                 x->ptp_rx_msg_type_pdelay_resp++;
 140         else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
 141                 x->ptp_rx_msg_type_pdelay_follow_up++;
 142         else if (message_type == RDES_PTP_ANNOUNCE)
 143                 x->ptp_rx_msg_type_announce++;
 144         else if (message_type == RDES_PTP_MANAGEMENT)
 145                 x->ptp_rx_msg_type_management++;
 146         else if (message_type == RDES_PTP_PKT_RESERVED_TYPE)
 147                 x->ptp_rx_msg_pkt_reserved_type++;
 148
 149         if (rdes1 & RDES1_PTP_PACKET_TYPE)
 150                 x->ptp_frame_type++;
 151         if (rdes1 & RDES1_PTP_VER)
 152                 x->ptp_ver++;
 153         if (rdes1 & RDES1_TIMESTAMP_DROPPED)
 154                 x->timestamp_dropped++;
 155
 156         if (unlikely(rdes2 & RDES2_SA_FILTER_FAIL)) {
 157                 x->sa_rx_filter_fail++;
 158                 ret = discard_frame;
 159         }
 160         if (unlikely(rdes2 & RDES2_DA_FILTER_FAIL)) {
 161                 x->da_rx_filter_fail++;
 162                 ret = discard_frame;
 163         }
 164
 165         if (rdes2 & RDES2_L3_FILTER_MATCH)
 166                 x->l3_filter_match++;
 167         if (rdes2 & RDES2_L4_FILTER_MATCH)
 168                 x->l4_filter_match++;
 169         if ((rdes2 & RDES2_L3_L4_FILT_NB_MATCH_MASK)
 170             >> RDES2_L3_L4_FILT_NB_MATCH_SHIFT)
 171                 x->l3_l4_filter_no_match++;
 172
 173         return ret;
 174 }
 175
 176 static int dwmac4_rd_get_tx_len(struct dma_desc *p)
 177 {
 178         return (le32_to_cpu(p->des2) & TDES2_BUFFER1_SIZE_MASK);
 179 }
 180
 181 static int dwmac4_get_tx_owner(struct dma_desc *p)
 182 {
 183         return (le32_to_cpu(p->des3) & TDES3_OWN) >> TDES3_OWN_SHIFT;
 184 }
 185
 186 static void dwmac4_set_tx_owner(struct dma_desc *p)
 187 {
 188         p->des3 |= cpu_to_le32(TDES3_OWN);
 189 }
 190
 191 static void dwmac4_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
 192 {
 193         p->des3 |= cpu_to_le32(RDES3_OWN | RDES3_BUFFER1_VALID_ADDR);
 194
 195         if (!disable_rx_ic)
 196                 p->des3 |= cpu_to_le32(RDES3_INT_ON_COMPLETION_EN);
 197 }
 198
 199 static int dwmac4_get_tx_ls(struct dma_desc *p)
 200 {
 201         return (le32_to_cpu(p->des3) & TDES3_LAST_DESCRIPTOR)
 202                 >> TDES3_LAST_DESCRIPTOR_SHIFT;
 203 }
 204
 205 static int dwmac4_wrback_get_rx_frame_len(struct dma_desc *p, int rx_coe)
 206 {
 207         return (le32_to_cpu(p->des3) & RDES3_PACKET_SIZE_MASK);
 208 }
 209
 210 static void dwmac4_rd_enable_tx_timestamp(struct dma_desc *p)
 211 {
 212         p->des2 |= cpu_to_le32(TDES2_TIMESTAMP_ENABLE);
 213 }
 214
 215 static int dwmac4_wrback_get_tx_timestamp_status(struct dma_desc *p)
 216 {
 217         /* Context type from W/B descriptor must be zero */
 218         if (le32_to_cpu(p->des3) & TDES3_CONTEXT_TYPE)
 219                 return 0;
 220
 221         /* Tx Timestamp Status is 1 so des0 and des1'll have valid values */
 222         if (le32_to_cpu(p->des3) & TDES3_TIMESTAMP_STATUS)
 223                 return 1;
 224
 225         return 0;
 226 }
 227
 228 static inline void dwmac4_get_timestamp(void *desc, u32 ats, u64 *ts)
 229 {
 230         struct dma_desc *p = (struct dma_desc *)desc;
 231         u64 ns;
 232
 233         ns = le32_to_cpu(p->des0);
 234         /* convert high/sec time stamp value to nanosecond */
 235         ns += le32_to_cpu(p->des1) * 1000000000ULL;
 236
 237         *ts = ns;
 238 }
 239
 240 static int dwmac4_rx_check_timestamp(void *desc)
 241 {
 242         struct dma_desc *p = (struct dma_desc *)desc;
 243         unsigned int rdes0 = le32_to_cpu(p->des0);
 244         unsigned int rdes1 = le32_to_cpu(p->des1);
 245         unsigned int rdes3 = le32_to_cpu(p->des3);
 246         u32 own, ctxt;
 247         int ret = 1;
 248
 249         own = rdes3 & RDES3_OWN;
 250         ctxt = ((rdes3 & RDES3_CONTEXT_DESCRIPTOR)
 251                 >> RDES3_CONTEXT_DESCRIPTOR_SHIFT);
 252
 253         if (likely(!own && ctxt)) {
 254                 if ((rdes0 == 0xffffffff) && (rdes1 == 0xffffffff))
 255                         /* Corrupted value */
 256                         ret = -EINVAL;
 257                 else
 258                         /* A valid Timestamp is ready to be read */
 259                         ret = 0;
 260         }
 261
 262         /* Timestamp not ready */
 263         return ret;
 264 }
 265
 266 static int dwmac4_wrback_get_rx_timestamp_status(void *desc, void *next_desc,
 267                                                  u32 ats)
 268 {
 269         struct dma_desc *p = (struct dma_desc *)desc;
 270         int ret = -EINVAL;
 271
 272         /* Get the status from normal w/b descriptor */
 273         if (likely(le32_to_cpu(p->des3) & RDES3_RDES1_VALID)) {
 274                 if (likely(le32_to_cpu(p->des1) & RDES1_TIMESTAMP_AVAILABLE)) {
 275                         int i = 0;
 276
 277                         /* Check if timestamp is OK from context descriptor */
 278                         do {
 279                                 ret = dwmac4_rx_check_timestamp(next_desc);
 280                                 if (ret < 0)
 281                                         goto exit;
 282                                 i++;
 283
 284                         } while ((ret == 1) && (i < 10));
 285
 286                         if (i == 10)
 287                                 ret = -EBUSY;
 288                 }
 289         }
 290 exit:
 291         if (likely(ret == 0))
 292                 return 1;
 293
 294         return 0;
 295 }
 296
 297 static void dwmac4_rd_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
 298                                    int mode, int end, int bfsize)
 299 {
 300         dwmac4_set_rx_owner(p, disable_rx_ic);
 301 }
 302
 303 static void dwmac4_rd_init_tx_desc(struct dma_desc *p, int mode, int end)
 304 {
 305         p->des0 = 0;
 306         p->des1 = 0;
 307         p->des2 = 0;
 308         p->des3 = 0;
 309 }
 310
 311 static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 312                                       bool csum_flag, int mode, bool tx_own,
 313                                       bool ls, unsigned int tot_pkt_len)
 314 {
 315         unsigned int tdes3 = le32_to_cpu(p->des3);
 316
 317         p->des2 |= cpu_to_le32(len & TDES2_BUFFER1_SIZE_MASK);
 318
 319         tdes3 |= tot_pkt_len & TDES3_PACKET_SIZE_MASK;
 320         if (is_fs)
 321                 tdes3 |= TDES3_FIRST_DESCRIPTOR;
 322         else
 323                 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
 324
 325         if (likely(csum_flag))
 326                 tdes3 |= (TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
 327         else
 328                 tdes3 &= ~(TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
 329
 330         if (ls)
 331                 tdes3 |= TDES3_LAST_DESCRIPTOR;
 332         else
 333                 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
 334
 335         /* Finally set the OWN bit. Later the DMA will start! */
 336         if (tx_own)
 337                 tdes3 |= TDES3_OWN;
 338
 339         if (is_fs && tx_own)
 340                 /* When the own bit, for the first frame, has to be set, all
 341                  * descriptors for the same frame has to be set before, to
 342                  * avoid race condition.
 343                  */
 344                 dma_wmb();
 345
 346         p->des3 = cpu_to_le32(tdes3);
 347 }
 348
 349 static void dwmac4_rd_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
 350                                           int len1, int len2, bool tx_own,
 351                                           bool ls, unsigned int tcphdrlen,
 352                                           unsigned int tcppayloadlen)
 353 {
 354         unsigned int tdes3 = le32_to_cpu(p->des3);
 355
 356         if (len1)
 357                 p->des2 |= cpu_to_le32((len1 & TDES2_BUFFER1_SIZE_MASK));
 358
 359         if (len2)
 360                 p->des2 |= cpu_to_le32((len2 << TDES2_BUFFER2_SIZE_MASK_SHIFT)
 361                             & TDES2_BUFFER2_SIZE_MASK);
 362
 363         if (is_fs) {
 364                 tdes3 |= TDES3_FIRST_DESCRIPTOR |
 365                          TDES3_TCP_SEGMENTATION_ENABLE |
 366                          ((tcphdrlen << TDES3_HDR_LEN_SHIFT) &
 367                           TDES3_SLOT_NUMBER_MASK) |
 368                          ((tcppayloadlen & TDES3_TCP_PKT_PAYLOAD_MASK));
 369         } else {
 370                 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
 371         }
 372
 373         if (ls)
 374                 tdes3 |= TDES3_LAST_DESCRIPTOR;
 375         else
 376                 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
 377
 378         /* Finally set the OWN bit. Later the DMA will start! */
 379         if (tx_own)
 380                 tdes3 |= TDES3_OWN;
 381
 382         if (is_fs && tx_own)
 383                 /* When the own bit, for the first frame, has to be set, all
 384                  * descriptors for the same frame has to be set before, to
 385                  * avoid race condition.
 386                  */
 387                 dma_wmb();
 388
 389         p->des3 = cpu_to_le32(tdes3);
 390 }
 391
 392 static void dwmac4_release_tx_desc(struct dma_desc *p, int mode)
 393 {
 394         p->des0 = 0;
 395         p->des1 = 0;
 396         p->des2 = 0;
 397         p->des3 = 0;
 398 }
 399
 400 static void dwmac4_rd_set_tx_ic(struct dma_desc *p)
 401 {
 402         p->des2 |= cpu_to_le32(TDES2_INTERRUPT_ON_COMPLETION);
 403 }
 404
 405 static void dwmac4_display_ring(void *head, unsigned int size, bool rx)
 406 {
 407         struct dma_desc *p = (struct dma_desc *)head;
 408         int i;
 409
 410         pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
 411
 412         for (i = 0; i < size; i++) {
 413                 pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
 414                         i, (unsigned int)virt_to_phys(p),
 415                         le32_to_cpu(p->des0), le32_to_cpu(p->des1),
 416                         le32_to_cpu(p->des2), le32_to_cpu(p->des3));
 417                 p++;
 418         }
 419 }
 420
 421 static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
 422 {
 423         p->des0 = 0;
 424         p->des1 = 0;
 425         p->des2 = cpu_to_le32(mss);
 426         p->des3 = cpu_to_le32(TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV);
 427 }
 428
 429 static void dwmac4_get_addr(struct dma_desc *p, unsigned int *addr)
 430 {
 431         *addr = le32_to_cpu(p->des0);
 432 }
 433
 434 static void dwmac4_set_addr(struct dma_desc *p, dma_addr_t addr)
 435 {
 436         p->des0 = cpu_to_le32(lower_32_bits(addr));
 437         p->des1 = cpu_to_le32(upper_32_bits(addr));
 438 }
 439
 440 static void dwmac4_clear(struct dma_desc *p)
 441 {
 442         p->des0 = 0;
 443         p->des1 = 0;
 444         p->des2 = 0;
 445         p->des3 = 0;
 446 }
 447
 448 static void dwmac4_set_sarc(struct dma_desc *p, u32 sarc_type)
 449 {
 450         sarc_type <<= TDES3_SA_INSERT_CTRL_SHIFT;
 451
 452         p->des3 |= cpu_to_le32(sarc_type & TDES3_SA_INSERT_CTRL_MASK);
 453 }
 454
 455 static int set_16kib_bfsize(int mtu)
 456 {
 457         int ret = 0;
 458
 459         if (unlikely(mtu >= BUF_SIZE_8KiB))
 460                 ret = BUF_SIZE_16KiB;
 461         return ret;
 462 }
 463
 464 static void dwmac4_set_vlan_tag(struct dma_desc *p, u16 tag, u16 inner_tag,
 465                                 u32 inner_type)
 466 {
 467         p->des0 = 0;
 468         p->des1 = 0;
 469         p->des2 = 0;
 470         p->des3 = 0;
 471
 472         /* Inner VLAN */
 473         if (inner_type) {
 474                 u32 des = inner_tag << TDES2_IVT_SHIFT;
 475
 476                 des &= TDES2_IVT_MASK;
 477                 p->des2 = cpu_to_le32(des);
 478
 479                 des = inner_type << TDES3_IVTIR_SHIFT;
 480                 des &= TDES3_IVTIR_MASK;
 481                 p->des3 = cpu_to_le32(des | TDES3_IVLTV);
 482         }
 483
 484         /* Outer VLAN */
 485         p->des3 |= cpu_to_le32(tag & TDES3_VLAN_TAG);
 486         p->des3 |= cpu_to_le32(TDES3_VLTV);
 487
 488         p->des3 |= cpu_to_le32(TDES3_CONTEXT_TYPE);
 489 }
 490
 491 static void dwmac4_set_vlan(struct dma_desc *p, u32 type)
 492 {
 493         type <<= TDES2_VLAN_TAG_SHIFT;
 494         p->des2 |= cpu_to_le32(type & TDES2_VLAN_TAG_MASK);
 495 }
 496
 497 static int dwmac4_get_rx_header_len(struct dma_desc *p, unsigned int *len)
 498 {
 499         *len = le32_to_cpu(p->des2) & RDES2_HL;
 500         return 0;
 501 }
 502
 503 static void dwmac4_set_sec_addr(struct dma_desc *p, dma_addr_t addr)
 504 {
 505         p->des2 = cpu_to_le32(lower_32_bits(addr));
 506         p->des3 = cpu_to_le32(upper_32_bits(addr) | RDES3_BUFFER2_VALID_ADDR);
 507 }
 508
 509 static void dwmac4_set_tbs(struct dma_edesc *p, u32 sec, u32 nsec)
 510 {
 511         p->des4 = cpu_to_le32((sec & TDES4_LT) | TDES4_LTV);
 512         p->des5 = cpu_to_le32(nsec & TDES5_LT);
 513         p->des6 = 0;
 514         p->des7 = 0;
 515 }
 516
 517 const struct stmmac_desc_ops dwmac4_desc_ops = {
 518         .tx_status = dwmac4_wrback_get_tx_status,
 519         .rx_status = dwmac4_wrback_get_rx_status,
 520         .get_tx_len = dwmac4_rd_get_tx_len,
 521         .get_tx_owner = dwmac4_get_tx_owner,
 522         .set_tx_owner = dwmac4_set_tx_owner,
 523         .set_rx_owner = dwmac4_set_rx_owner,
 524         .get_tx_ls = dwmac4_get_tx_ls,
 525         .get_rx_frame_len = dwmac4_wrback_get_rx_frame_len,
 526         .enable_tx_timestamp = dwmac4_rd_enable_tx_timestamp,
 527         .get_tx_timestamp_status = dwmac4_wrback_get_tx_timestamp_status,
 528         .get_rx_timestamp_status = dwmac4_wrback_get_rx_timestamp_status,
 529         .get_timestamp = dwmac4_get_timestamp,
 530         .set_tx_ic = dwmac4_rd_set_tx_ic,
 531         .prepare_tx_desc = dwmac4_rd_prepare_tx_desc,
 532         .prepare_tso_tx_desc = dwmac4_rd_prepare_tso_tx_desc,
 533         .release_tx_desc = dwmac4_release_tx_desc,
 534         .init_rx_desc = dwmac4_rd_init_rx_desc,
 535         .init_tx_desc = dwmac4_rd_init_tx_desc,
 536         .display_ring = dwmac4_display_ring,
 537         .set_mss = dwmac4_set_mss_ctxt,
 538         .get_addr = dwmac4_get_addr,
 539         .set_addr = dwmac4_set_addr,
 540         .clear = dwmac4_clear,
 541         .set_sarc = dwmac4_set_sarc,
 542         .set_vlan_tag = dwmac4_set_vlan_tag,
 543         .set_vlan = dwmac4_set_vlan,
 544         .get_rx_header_len = dwmac4_get_rx_header_len,
 545         .set_sec_addr = dwmac4_set_sec_addr,
 546         .set_tbs = dwmac4_set_tbs,
 547 };
 548
 549 const struct stmmac_mode_ops dwmac4_ring_mode_ops = {
 550         .set_16kib_bfsize = set_16kib_bfsize,
 551 };