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

   1 /*
   2  * This contains the functions to handle the descriptors for DesignWare databook
   3  * 4.xx.
   4  *
   5  * Copyright (C) 2015  STMicroelectronics Ltd
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * Author: Alexandre Torgue <alexandre.torgue@st.com>
  12  */
  13
  14 #include <linux/stmmac.h>
  15 #include "common.h"
  16 #include "dwmac4_descs.h"
  17
  18 static int dwmac4_wrback_get_tx_status(void *data, struct stmmac_extra_stats *x,
  19                                        struct dma_desc *p,
  20                                        void __iomem *ioaddr)
  21 {
  22         struct net_device_stats *stats = (struct net_device_stats *)data;
  23         unsigned int tdes3;
  24         int ret = tx_done;
  25
  26         tdes3 = p->des3;
  27
  28         /* Get tx owner first */
  29         if (unlikely(tdes3 & TDES3_OWN))
  30                 return tx_dma_own;
  31
  32         /* Verify tx error by looking at the last segment. */
  33         if (likely(!(tdes3 & TDES3_LAST_DESCRIPTOR)))
  34                 return tx_not_ls;
  35
  36         if (unlikely(tdes3 & TDES3_ERROR_SUMMARY)) {
  37                 if (unlikely(tdes3 & TDES3_JABBER_TIMEOUT))
  38                         x->tx_jabber++;
  39                 if (unlikely(tdes3 & TDES3_PACKET_FLUSHED))
  40                         x->tx_frame_flushed++;
  41                 if (unlikely(tdes3 & TDES3_LOSS_CARRIER)) {
  42                         x->tx_losscarrier++;
  43                         stats->tx_carrier_errors++;
  44                 }
  45                 if (unlikely(tdes3 & TDES3_NO_CARRIER)) {
  46                         x->tx_carrier++;
  47                         stats->tx_carrier_errors++;
  48                 }
  49                 if (unlikely((tdes3 & TDES3_LATE_COLLISION) ||
  50                              (tdes3 & TDES3_EXCESSIVE_COLLISION)))
  51                         stats->collisions +=
  52                             (tdes3 & TDES3_COLLISION_COUNT_MASK)
  53                             >> TDES3_COLLISION_COUNT_SHIFT;
  54
  55                 if (unlikely(tdes3 & TDES3_EXCESSIVE_DEFERRAL))
  56                         x->tx_deferred++;
  57
  58                 if (unlikely(tdes3 & TDES3_UNDERFLOW_ERROR))
  59                         x->tx_underflow++;
  60
  61                 if (unlikely(tdes3 & TDES3_IP_HDR_ERROR))
  62                         x->tx_ip_header_error++;
  63
  64                 if (unlikely(tdes3 & TDES3_PAYLOAD_ERROR))
  65                         x->tx_payload_error++;
  66
  67                 ret = tx_err;
  68         }
  69
  70         if (unlikely(tdes3 & TDES3_DEFERRED))
  71                 x->tx_deferred++;
  72
  73         return ret;
  74 }
  75
  76 static int dwmac4_wrback_get_rx_status(void *data, struct stmmac_extra_stats *x,
  77                                        struct dma_desc *p)
  78 {
  79         struct net_device_stats *stats = (struct net_device_stats *)data;
  80         unsigned int rdes1 = p->des1;
  81         unsigned int rdes2 = p->des2;
  82         unsigned int rdes3 = p->des3;
  83         int message_type;
  84         int ret = good_frame;
  85
  86         if (unlikely(rdes3 & RDES3_OWN))
  87                 return dma_own;
  88
  89         /* Verify rx error by looking at the last segment. */
  90         if (likely(!(rdes3 & RDES3_LAST_DESCRIPTOR)))
  91                 return discard_frame;
  92
  93         if (unlikely(rdes3 & RDES3_ERROR_SUMMARY)) {
  94                 if (unlikely(rdes3 & RDES3_GIANT_PACKET))
  95                         stats->rx_length_errors++;
  96                 if (unlikely(rdes3 & RDES3_OVERFLOW_ERROR))
  97                         x->rx_gmac_overflow++;
  98
  99                 if (unlikely(rdes3 & RDES3_RECEIVE_WATCHDOG))
 100                         x->rx_watchdog++;
 101
 102                 if (unlikely(rdes3 & RDES3_RECEIVE_ERROR))
 103                         x->rx_mii++;
 104
 105                 if (unlikely(rdes3 & RDES3_CRC_ERROR)) {
 106                         x->rx_crc++;
 107                         stats->rx_crc_errors++;
 108                 }
 109
 110                 if (unlikely(rdes3 & RDES3_DRIBBLE_ERROR))
 111                         x->dribbling_bit++;
 112
 113                 ret = discard_frame;
 114         }
 115
 116         message_type = (rdes1 & ERDES4_MSG_TYPE_MASK) >> 8;
 117
 118         if (rdes1 & RDES1_IP_HDR_ERROR)
 119                 x->ip_hdr_err++;
 120         if (rdes1 & RDES1_IP_CSUM_BYPASSED)
 121                 x->ip_csum_bypassed++;
 122         if (rdes1 & RDES1_IPV4_HEADER)
 123                 x->ipv4_pkt_rcvd++;
 124         if (rdes1 & RDES1_IPV6_HEADER)
 125                 x->ipv6_pkt_rcvd++;
 126
 127         if (message_type == RDES_EXT_NO_PTP)
 128                 x->no_ptp_rx_msg_type_ext++;
 129         else if (message_type == RDES_EXT_SYNC)
 130                 x->ptp_rx_msg_type_sync++;
 131         else if (message_type == RDES_EXT_FOLLOW_UP)
 132                 x->ptp_rx_msg_type_follow_up++;
 133         else if (message_type == RDES_EXT_DELAY_REQ)
 134                 x->ptp_rx_msg_type_delay_req++;
 135         else if (message_type == RDES_EXT_DELAY_RESP)
 136                 x->ptp_rx_msg_type_delay_resp++;
 137         else if (message_type == RDES_EXT_PDELAY_REQ)
 138                 x->ptp_rx_msg_type_pdelay_req++;
 139         else if (message_type == RDES_EXT_PDELAY_RESP)
 140                 x->ptp_rx_msg_type_pdelay_resp++;
 141         else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
 142                 x->ptp_rx_msg_type_pdelay_follow_up++;
 143         else if (message_type == RDES_PTP_ANNOUNCE)
 144                 x->ptp_rx_msg_type_announce++;
 145         else if (message_type == RDES_PTP_MANAGEMENT)
 146                 x->ptp_rx_msg_type_management++;
 147         else if (message_type == RDES_PTP_PKT_RESERVED_TYPE)
 148                 x->ptp_rx_msg_pkt_reserved_type++;
 149
 150         if (rdes1 & RDES1_PTP_PACKET_TYPE)
 151                 x->ptp_frame_type++;
 152         if (rdes1 & RDES1_PTP_VER)
 153                 x->ptp_ver++;
 154         if (rdes1 & RDES1_TIMESTAMP_DROPPED)
 155                 x->timestamp_dropped++;
 156
 157         if (unlikely(rdes2 & RDES2_SA_FILTER_FAIL)) {
 158                 x->sa_rx_filter_fail++;
 159                 ret = discard_frame;
 160         }
 161         if (unlikely(rdes2 & RDES2_DA_FILTER_FAIL)) {
 162                 x->da_rx_filter_fail++;
 163                 ret = discard_frame;
 164         }
 165
 166         if (rdes2 & RDES2_L3_FILTER_MATCH)
 167                 x->l3_filter_match++;
 168         if (rdes2 & RDES2_L4_FILTER_MATCH)
 169                 x->l4_filter_match++;
 170         if ((rdes2 & RDES2_L3_L4_FILT_NB_MATCH_MASK)
 171             >> RDES2_L3_L4_FILT_NB_MATCH_SHIFT)
 172                 x->l3_l4_filter_no_match++;
 173
 174         return ret;
 175 }
 176
 177 static int dwmac4_rd_get_tx_len(struct dma_desc *p)
 178 {
 179         return (p->des2 & TDES2_BUFFER1_SIZE_MASK);
 180 }
 181
 182 static int dwmac4_get_tx_owner(struct dma_desc *p)
 183 {
 184         return (p->des3 & TDES3_OWN) >> TDES3_OWN_SHIFT;
 185 }
 186
 187 static void dwmac4_set_tx_owner(struct dma_desc *p)
 188 {
 189         p->des3 |= TDES3_OWN;
 190 }
 191
 192 static void dwmac4_set_rx_owner(struct dma_desc *p)
 193 {
 194         p->des3 |= RDES3_OWN;
 195 }
 196
 197 static int dwmac4_get_tx_ls(struct dma_desc *p)
 198 {
 199         return (p->des3 & TDES3_LAST_DESCRIPTOR) >> TDES3_LAST_DESCRIPTOR_SHIFT;
 200 }
 201
 202 static int dwmac4_wrback_get_rx_frame_len(struct dma_desc *p, int rx_coe)
 203 {
 204         return (p->des3 & RDES3_PACKET_SIZE_MASK);
 205 }
 206
 207 static void dwmac4_rd_enable_tx_timestamp(struct dma_desc *p)
 208 {
 209         p->des2 |= TDES2_TIMESTAMP_ENABLE;
 210 }
 211
 212 static int dwmac4_wrback_get_tx_timestamp_status(struct dma_desc *p)
 213 {
 214         /* Context type from W/B descriptor must be zero */
 215         if (p->des3 & TDES3_CONTEXT_TYPE)
 216                 return -EINVAL;
 217
 218         /* Tx Timestamp Status is 1 so des0 and des1'll have valid values */
 219         if (p->des3 & TDES3_TIMESTAMP_STATUS)
 220                 return 0;
 221
 222         return 1;
 223 }
 224
 225 static inline u64 dwmac4_get_timestamp(void *desc, u32 ats)
 226 {
 227         struct dma_desc *p = (struct dma_desc *)desc;
 228         u64 ns;
 229
 230         ns = p->des0;
 231         /* convert high/sec time stamp value to nanosecond */
 232         ns += p->des1 * 1000000000ULL;
 233
 234         return ns;
 235 }
 236
 237 static int dwmac4_rx_check_timestamp(void *desc)
 238 {
 239         struct dma_desc *p = (struct dma_desc *)desc;
 240         u32 own, ctxt;
 241         int ret = 1;
 242
 243         own = p->des3 & RDES3_OWN;
 244         ctxt = ((p->des3 & RDES3_CONTEXT_DESCRIPTOR)
 245                 >> RDES3_CONTEXT_DESCRIPTOR_SHIFT);
 246
 247         if (likely(!own && ctxt)) {
 248                 if ((p->des0 == 0xffffffff) && (p->des1 == 0xffffffff))
 249                         /* Corrupted value */
 250                         ret = -EINVAL;
 251                 else
 252                         /* A valid Timestamp is ready to be read */
 253                         ret = 0;
 254         }
 255
 256         /* Timestamp not ready */
 257         return ret;
 258 }
 259
 260 static int dwmac4_wrback_get_rx_timestamp_status(void *desc, u32 ats)
 261 {
 262         struct dma_desc *p = (struct dma_desc *)desc;
 263         int ret = -EINVAL;
 264
 265         /* Get the status from normal w/b descriptor */
 266         if (likely(p->des3 & TDES3_RS1V)) {
 267                 if (likely(p->des1 & RDES1_TIMESTAMP_AVAILABLE)) {
 268                         int i = 0;
 269
 270                         /* Check if timestamp is OK from context descriptor */
 271                         do {
 272                                 ret = dwmac4_rx_check_timestamp(desc);
 273                                 if (ret < 0)
 274                                         goto exit;
 275                                 i++;
 276
 277                         } while ((ret == 1) || (i < 10));
 278
 279                         if (i == 10)
 280                                 ret = -EBUSY;
 281                 }
 282         }
 283 exit:
 284         return ret;
 285 }
 286
 287 static void dwmac4_rd_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
 288                                    int mode, int end)
 289 {
 290         p->des3 = RDES3_OWN | RDES3_BUFFER1_VALID_ADDR;
 291
 292         if (!disable_rx_ic)
 293                 p->des3 |= RDES3_INT_ON_COMPLETION_EN;
 294 }
 295
 296 static void dwmac4_rd_init_tx_desc(struct dma_desc *p, int mode, int end)
 297 {
 298         p->des0 = 0;
 299         p->des1 = 0;
 300         p->des2 = 0;
 301         p->des3 = 0;
 302 }
 303
 304 static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 305                                       bool csum_flag, int mode, bool tx_own,
 306                                       bool ls)
 307 {
 308         unsigned int tdes3 = p->des3;
 309
 310         p->des2 |= (len & TDES2_BUFFER1_SIZE_MASK);
 311
 312         if (is_fs)
 313                 tdes3 |= TDES3_FIRST_DESCRIPTOR;
 314         else
 315                 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
 316
 317         if (likely(csum_flag))
 318                 tdes3 |= (TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
 319         else
 320                 tdes3 &= ~(TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
 321
 322         if (ls)
 323                 tdes3 |= TDES3_LAST_DESCRIPTOR;
 324         else
 325                 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
 326
 327         /* Finally set the OWN bit. Later the DMA will start! */
 328         if (tx_own)
 329                 tdes3 |= TDES3_OWN;
 330
 331         if (is_fs & tx_own)
 332                 /* When the own bit, for the first frame, has to be set, all
 333                  * descriptors for the same frame has to be set before, to
 334                  * avoid race condition.
 335                  */
 336                 wmb();
 337
 338         p->des3 = tdes3;
 339 }
 340
 341 static void dwmac4_rd_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
 342                                           int len1, int len2, bool tx_own,
 343                                           bool ls, unsigned int tcphdrlen,
 344                                           unsigned int tcppayloadlen)
 345 {
 346         unsigned int tdes3 = p->des3;
 347
 348         if (len1)
 349                 p->des2 |= (len1 & TDES2_BUFFER1_SIZE_MASK);
 350
 351         if (len2)
 352                 p->des2 |= (len2 << TDES2_BUFFER2_SIZE_MASK_SHIFT)
 353                             & TDES2_BUFFER2_SIZE_MASK;
 354
 355         if (is_fs) {
 356                 tdes3 |= TDES3_FIRST_DESCRIPTOR |
 357                          TDES3_TCP_SEGMENTATION_ENABLE |
 358                          ((tcphdrlen << TDES3_HDR_LEN_SHIFT) &
 359                           TDES3_SLOT_NUMBER_MASK) |
 360                          ((tcppayloadlen & TDES3_TCP_PKT_PAYLOAD_MASK));
 361         } else {
 362                 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
 363         }
 364
 365         if (ls)
 366                 tdes3 |= TDES3_LAST_DESCRIPTOR;
 367         else
 368                 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
 369
 370         /* Finally set the OWN bit. Later the DMA will start! */
 371         if (tx_own)
 372                 tdes3 |= TDES3_OWN;
 373
 374         if (is_fs & tx_own)
 375                 /* When the own bit, for the first frame, has to be set, all
 376                  * descriptors for the same frame has to be set before, to
 377                  * avoid race condition.
 378                  */
 379                 wmb();
 380
 381         p->des3 = tdes3;
 382 }
 383
 384 static void dwmac4_release_tx_desc(struct dma_desc *p, int mode)
 385 {
 386         p->des2 = 0;
 387         p->des3 = 0;
 388 }
 389
 390 static void dwmac4_rd_set_tx_ic(struct dma_desc *p)
 391 {
 392         p->des2 |= TDES2_INTERRUPT_ON_COMPLETION;
 393 }
 394
 395 static void dwmac4_display_ring(void *head, unsigned int size, bool rx)
 396 {
 397         struct dma_desc *p = (struct dma_desc *)head;
 398         int i;
 399
 400         pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
 401
 402         for (i = 0; i < size; i++) {
 403                 pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
 404                         i, (unsigned int)virt_to_phys(p),
 405                         p->des0, p->des1, p->des2, p->des3);
 406                 p++;
 407         }
 408 }
 409
 410 static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
 411 {
 412         p->des0 = 0;
 413         p->des1 = 0;
 414         p->des2 = mss;
 415         p->des3 = TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV;
 416 }
 417
 418 const struct stmmac_desc_ops dwmac4_desc_ops = {
 419         .tx_status = dwmac4_wrback_get_tx_status,
 420         .rx_status = dwmac4_wrback_get_rx_status,
 421         .get_tx_len = dwmac4_rd_get_tx_len,
 422         .get_tx_owner = dwmac4_get_tx_owner,
 423         .set_tx_owner = dwmac4_set_tx_owner,
 424         .set_rx_owner = dwmac4_set_rx_owner,
 425         .get_tx_ls = dwmac4_get_tx_ls,
 426         .get_rx_frame_len = dwmac4_wrback_get_rx_frame_len,
 427         .enable_tx_timestamp = dwmac4_rd_enable_tx_timestamp,
 428         .get_tx_timestamp_status = dwmac4_wrback_get_tx_timestamp_status,
 429         .get_rx_timestamp_status = dwmac4_wrback_get_rx_timestamp_status,
 430         .get_timestamp = dwmac4_get_timestamp,
 431         .set_tx_ic = dwmac4_rd_set_tx_ic,
 432         .prepare_tx_desc = dwmac4_rd_prepare_tx_desc,
 433         .prepare_tso_tx_desc = dwmac4_rd_prepare_tso_tx_desc,
 434         .release_tx_desc = dwmac4_release_tx_desc,
 435         .init_rx_desc = dwmac4_rd_init_rx_desc,
 436         .init_tx_desc = dwmac4_rd_init_tx_desc,
 437         .display_ring = dwmac4_display_ring,
 438         .set_mss = dwmac4_set_mss_ctxt,
 439 };
 440
 441 const struct stmmac_mode_ops dwmac4_ring_mode_ops = { };