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         if (message_type == RDES_EXT_SYNC)
 127                 x->rx_msg_type_sync++;
 128         else if (message_type == RDES_EXT_FOLLOW_UP)
 129                 x->rx_msg_type_follow_up++;
 130         else if (message_type == RDES_EXT_DELAY_REQ)
 131                 x->rx_msg_type_delay_req++;
 132         else if (message_type == RDES_EXT_DELAY_RESP)
 133                 x->rx_msg_type_delay_resp++;
 134         else if (message_type == RDES_EXT_PDELAY_REQ)
 135                 x->rx_msg_type_pdelay_req++;
 136         else if (message_type == RDES_EXT_PDELAY_RESP)
 137                 x->rx_msg_type_pdelay_resp++;
 138         else if (message_type == RDES_EXT_PDELAY_FOLLOW_UP)
 139                 x->rx_msg_type_pdelay_follow_up++;
 140         else
 141                 x->rx_msg_type_ext_no_ptp++;
 142
 143         if (rdes1 & RDES1_PTP_PACKET_TYPE)
 144                 x->ptp_frame_type++;
 145         if (rdes1 & RDES1_PTP_VER)
 146                 x->ptp_ver++;
 147         if (rdes1 & RDES1_TIMESTAMP_DROPPED)
 148                 x->timestamp_dropped++;
 149
 150         if (unlikely(rdes2 & RDES2_SA_FILTER_FAIL)) {
 151                 x->sa_rx_filter_fail++;
 152                 ret = discard_frame;
 153         }
 154         if (unlikely(rdes2 & RDES2_DA_FILTER_FAIL)) {
 155                 x->da_rx_filter_fail++;
 156                 ret = discard_frame;
 157         }
 158
 159         if (rdes2 & RDES2_L3_FILTER_MATCH)
 160                 x->l3_filter_match++;
 161         if (rdes2 & RDES2_L4_FILTER_MATCH)
 162                 x->l4_filter_match++;
 163         if ((rdes2 & RDES2_L3_L4_FILT_NB_MATCH_MASK)
 164             >> RDES2_L3_L4_FILT_NB_MATCH_SHIFT)
 165                 x->l3_l4_filter_no_match++;
 166
 167         return ret;
 168 }
 169
 170 static int dwmac4_rd_get_tx_len(struct dma_desc *p)
 171 {
 172         return (p->des2 & TDES2_BUFFER1_SIZE_MASK);
 173 }
 174
 175 static int dwmac4_get_tx_owner(struct dma_desc *p)
 176 {
 177         return (p->des3 & TDES3_OWN) >> TDES3_OWN_SHIFT;
 178 }
 179
 180 static void dwmac4_set_tx_owner(struct dma_desc *p)
 181 {
 182         p->des3 |= TDES3_OWN;
 183 }
 184
 185 static void dwmac4_set_rx_owner(struct dma_desc *p)
 186 {
 187         p->des3 |= RDES3_OWN;
 188 }
 189
 190 static int dwmac4_get_tx_ls(struct dma_desc *p)
 191 {
 192         return (p->des3 & TDES3_LAST_DESCRIPTOR) >> TDES3_LAST_DESCRIPTOR_SHIFT;
 193 }
 194
 195 static int dwmac4_wrback_get_rx_frame_len(struct dma_desc *p, int rx_coe)
 196 {
 197         return (p->des3 & RDES3_PACKET_SIZE_MASK);
 198 }
 199
 200 static void dwmac4_rd_enable_tx_timestamp(struct dma_desc *p)
 201 {
 202         p->des2 |= TDES2_TIMESTAMP_ENABLE;
 203 }
 204
 205 static int dwmac4_wrback_get_tx_timestamp_status(struct dma_desc *p)
 206 {
 207         return (p->des3 & TDES3_TIMESTAMP_STATUS)
 208                 >> TDES3_TIMESTAMP_STATUS_SHIFT;
 209 }
 210
 211 /*  NOTE: For RX CTX bit has to be checked before
 212  *  HAVE a specific function for TX and another one for RX
 213  */
 214 static u64 dwmac4_wrback_get_timestamp(void *desc, u32 ats)
 215 {
 216         struct dma_desc *p = (struct dma_desc *)desc;
 217         u64 ns;
 218
 219         ns = p->des0;
 220         /* convert high/sec time stamp value to nanosecond */
 221         ns += p->des1 * 1000000000ULL;
 222
 223         return ns;
 224 }
 225
 226 static int dwmac4_context_get_rx_timestamp_status(void *desc, u32 ats)
 227 {
 228         struct dma_desc *p = (struct dma_desc *)desc;
 229
 230         return (p->des1 & RDES1_TIMESTAMP_AVAILABLE)
 231                 >> RDES1_TIMESTAMP_AVAILABLE_SHIFT;
 232 }
 233
 234 static void dwmac4_rd_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
 235                                    int mode, int end)
 236 {
 237         p->des3 = RDES3_OWN | RDES3_BUFFER1_VALID_ADDR;
 238
 239         if (!disable_rx_ic)
 240                 p->des3 |= RDES3_INT_ON_COMPLETION_EN;
 241 }
 242
 243 static void dwmac4_rd_init_tx_desc(struct dma_desc *p, int mode, int end)
 244 {
 245         p->des0 = 0;
 246         p->des1 = 0;
 247         p->des2 = 0;
 248         p->des3 = 0;
 249 }
 250
 251 static void dwmac4_rd_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 252                                       bool csum_flag, int mode, bool tx_own,
 253                                       bool ls)
 254 {
 255         unsigned int tdes3 = p->des3;
 256
 257         p->des2 |= (len & TDES2_BUFFER1_SIZE_MASK);
 258
 259         if (is_fs)
 260                 tdes3 |= TDES3_FIRST_DESCRIPTOR;
 261         else
 262                 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
 263
 264         if (likely(csum_flag))
 265                 tdes3 |= (TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
 266         else
 267                 tdes3 &= ~(TX_CIC_FULL << TDES3_CHECKSUM_INSERTION_SHIFT);
 268
 269         if (ls)
 270                 tdes3 |= TDES3_LAST_DESCRIPTOR;
 271         else
 272                 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
 273
 274         /* Finally set the OWN bit. Later the DMA will start! */
 275         if (tx_own)
 276                 tdes3 |= TDES3_OWN;
 277
 278         if (is_fs & tx_own)
 279                 /* When the own bit, for the first frame, has to be set, all
 280                  * descriptors for the same frame has to be set before, to
 281                  * avoid race condition.
 282                  */
 283                 wmb();
 284
 285         p->des3 = tdes3;
 286 }
 287
 288 static void dwmac4_rd_prepare_tso_tx_desc(struct dma_desc *p, int is_fs,
 289                                           int len1, int len2, bool tx_own,
 290                                           bool ls, unsigned int tcphdrlen,
 291                                           unsigned int tcppayloadlen)
 292 {
 293         unsigned int tdes3 = p->des3;
 294
 295         if (len1)
 296                 p->des2 |= (len1 & TDES2_BUFFER1_SIZE_MASK);
 297
 298         if (len2)
 299                 p->des2 |= (len2 << TDES2_BUFFER2_SIZE_MASK_SHIFT)
 300                             & TDES2_BUFFER2_SIZE_MASK;
 301
 302         if (is_fs) {
 303                 tdes3 |= TDES3_FIRST_DESCRIPTOR |
 304                          TDES3_TCP_SEGMENTATION_ENABLE |
 305                          ((tcphdrlen << TDES3_HDR_LEN_SHIFT) &
 306                           TDES3_SLOT_NUMBER_MASK) |
 307                          ((tcppayloadlen & TDES3_TCP_PKT_PAYLOAD_MASK));
 308         } else {
 309                 tdes3 &= ~TDES3_FIRST_DESCRIPTOR;
 310         }
 311
 312         if (ls)
 313                 tdes3 |= TDES3_LAST_DESCRIPTOR;
 314         else
 315                 tdes3 &= ~TDES3_LAST_DESCRIPTOR;
 316
 317         /* Finally set the OWN bit. Later the DMA will start! */
 318         if (tx_own)
 319                 tdes3 |= TDES3_OWN;
 320
 321         if (is_fs & tx_own)
 322                 /* When the own bit, for the first frame, has to be set, all
 323                  * descriptors for the same frame has to be set before, to
 324                  * avoid race condition.
 325                  */
 326                 wmb();
 327
 328         p->des3 = tdes3;
 329 }
 330
 331 static void dwmac4_release_tx_desc(struct dma_desc *p, int mode)
 332 {
 333         p->des2 = 0;
 334         p->des3 = 0;
 335 }
 336
 337 static void dwmac4_rd_set_tx_ic(struct dma_desc *p)
 338 {
 339         p->des2 |= TDES2_INTERRUPT_ON_COMPLETION;
 340 }
 341
 342 static void dwmac4_display_ring(void *head, unsigned int size, bool rx)
 343 {
 344         struct dma_desc *p = (struct dma_desc *)head;
 345         int i;
 346
 347         pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
 348
 349         for (i = 0; i < size; i++) {
 350                 pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
 351                         i, (unsigned int)virt_to_phys(p),
 352                         p->des0, p->des1, p->des2, p->des3);
 353                 p++;
 354         }
 355 }
 356
 357 static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
 358 {
 359         p->des0 = 0;
 360         p->des1 = 0;
 361         p->des2 = mss;
 362         p->des3 = TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV;
 363 }
 364
 365 const struct stmmac_desc_ops dwmac4_desc_ops = {
 366         .tx_status = dwmac4_wrback_get_tx_status,
 367         .rx_status = dwmac4_wrback_get_rx_status,
 368         .get_tx_len = dwmac4_rd_get_tx_len,
 369         .get_tx_owner = dwmac4_get_tx_owner,
 370         .set_tx_owner = dwmac4_set_tx_owner,
 371         .set_rx_owner = dwmac4_set_rx_owner,
 372         .get_tx_ls = dwmac4_get_tx_ls,
 373         .get_rx_frame_len = dwmac4_wrback_get_rx_frame_len,
 374         .enable_tx_timestamp = dwmac4_rd_enable_tx_timestamp,
 375         .get_tx_timestamp_status = dwmac4_wrback_get_tx_timestamp_status,
 376         .get_timestamp = dwmac4_wrback_get_timestamp,
 377         .get_rx_timestamp_status = dwmac4_context_get_rx_timestamp_status,
 378         .set_tx_ic = dwmac4_rd_set_tx_ic,
 379         .prepare_tx_desc = dwmac4_rd_prepare_tx_desc,
 380         .prepare_tso_tx_desc = dwmac4_rd_prepare_tso_tx_desc,
 381         .release_tx_desc = dwmac4_release_tx_desc,
 382         .init_rx_desc = dwmac4_rd_init_rx_desc,
 383         .init_tx_desc = dwmac4_rd_init_tx_desc,
 384         .display_ring = dwmac4_display_ring,
 385         .set_mss = dwmac4_set_mss_ctxt,
 386 };
 387
 388 const struct stmmac_mode_ops dwmac4_ring_mode_ops = { };