kernel/drivers/net/ethernet/stmicro/stmmac/enh_desc.c

   1 /*******************************************************************************
   2   This contains the functions to handle the enhanced descriptors.
   3
   4   Copyright (C) 2007-2009  STMicroelectronics Ltd
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  23 *******************************************************************************/
  24
  25 #include <linux/stmmac.h>
  26 #include "common.h"
  27 #include "descs_com.h"
  28
  29 static int enh_desc_get_tx_status(void *data, struct stmmac_extra_stats *x,
  30                                   struct dma_desc *p, void __iomem *ioaddr)
  31 {
  32         int ret = 0;
  33         struct net_device_stats *stats = (struct net_device_stats *)data;
  34
  35         if (unlikely(p->des01.etx.error_summary)) {
  36                 if (unlikely(p->des01.etx.jabber_timeout))
  37                         x->tx_jabber++;
  38
  39                 if (unlikely(p->des01.etx.frame_flushed)) {
  40                         x->tx_frame_flushed++;
  41                         dwmac_dma_flush_tx_fifo(ioaddr);
  42                 }
  43
  44                 if (unlikely(p->des01.etx.loss_carrier)) {
  45                         x->tx_losscarrier++;
  46                         stats->tx_carrier_errors++;
  47                 }
  48                 if (unlikely(p->des01.etx.no_carrier)) {
  49                         x->tx_carrier++;
  50                         stats->tx_carrier_errors++;
  51                 }
  52                 if (unlikely(p->des01.etx.late_collision))
  53                         stats->collisions += p->des01.etx.collision_count;
  54
  55                 if (unlikely(p->des01.etx.excessive_collisions))
  56                         stats->collisions += p->des01.etx.collision_count;
  57
  58                 if (unlikely(p->des01.etx.excessive_deferral))
  59                         x->tx_deferred++;
  60
  61                 if (unlikely(p->des01.etx.underflow_error)) {
  62                         dwmac_dma_flush_tx_fifo(ioaddr);
  63                         x->tx_underflow++;
  64                 }
  65
  66                 if (unlikely(p->des01.etx.ip_header_error))
  67                         x->tx_ip_header_error++;
  68
  69                 if (unlikely(p->des01.etx.payload_error)) {
  70                         x->tx_payload_error++;
  71                         dwmac_dma_flush_tx_fifo(ioaddr);
  72                 }
  73
  74                 ret = -1;
  75         }
  76
  77         if (unlikely(p->des01.etx.deferred))
  78                 x->tx_deferred++;
  79
  80 #ifdef STMMAC_VLAN_TAG_USED
  81         if (p->des01.etx.vlan_frame)
  82                 x->tx_vlan++;
  83 #endif
  84
  85         return ret;
  86 }
  87
  88 static int enh_desc_get_tx_len(struct dma_desc *p)
  89 {
  90         return p->des01.etx.buffer1_size;
  91 }
  92
  93 static int enh_desc_coe_rdes0(int ipc_err, int type, int payload_err)
  94 {
  95         int ret = good_frame;
  96         u32 status = (type << 2 | ipc_err << 1 | payload_err) & 0x7;
  97
  98         /* bits 5 7 0 | Frame status
  99          * ----------------------------------------------------------
 100          *      0 0 0 | IEEE 802.3 Type frame (length < 1536 octects)
 101          *      1 0 0 | IPv4/6 No CSUM errorS.
 102          *      1 0 1 | IPv4/6 CSUM PAYLOAD error
 103          *      1 1 0 | IPv4/6 CSUM IP HR error
 104          *      1 1 1 | IPv4/6 IP PAYLOAD AND HEADER errorS
 105          *      0 0 1 | IPv4/6 unsupported IP PAYLOAD
 106          *      0 1 1 | COE bypassed.. no IPv4/6 frame
 107          *      0 1 0 | Reserved.
 108          */
 109         if (status == 0x0)
 110                 ret = llc_snap;
 111         else if (status == 0x4)
 112                 ret = good_frame;
 113         else if (status == 0x5)
 114                 ret = csum_none;
 115         else if (status == 0x6)
 116                 ret = csum_none;
 117         else if (status == 0x7)
 118                 ret = csum_none;
 119         else if (status == 0x1)
 120                 ret = discard_frame;
 121         else if (status == 0x3)
 122                 ret = discard_frame;
 123         return ret;
 124 }
 125
 126 static void enh_desc_get_ext_status(void *data, struct stmmac_extra_stats *x,
 127                                     struct dma_extended_desc *p)
 128 {
 129         if (unlikely(p->basic.des01.erx.rx_mac_addr)) {
 130                 if (p->des4.erx.ip_hdr_err)
 131                         x->ip_hdr_err++;
 132                 if (p->des4.erx.ip_payload_err)
 133                         x->ip_payload_err++;
 134                 if (p->des4.erx.ip_csum_bypassed)
 135                         x->ip_csum_bypassed++;
 136                 if (p->des4.erx.ipv4_pkt_rcvd)
 137                         x->ipv4_pkt_rcvd++;
 138                 if (p->des4.erx.ipv6_pkt_rcvd)
 139                         x->ipv6_pkt_rcvd++;
 140                 if (p->des4.erx.msg_type == RDES_EXT_SYNC)
 141                         x->rx_msg_type_sync++;
 142                 else if (p->des4.erx.msg_type == RDES_EXT_FOLLOW_UP)
 143                         x->rx_msg_type_follow_up++;
 144                 else if (p->des4.erx.msg_type == RDES_EXT_DELAY_REQ)
 145                         x->rx_msg_type_delay_req++;
 146                 else if (p->des4.erx.msg_type == RDES_EXT_DELAY_RESP)
 147                         x->rx_msg_type_delay_resp++;
 148                 else if (p->des4.erx.msg_type == RDES_EXT_PDELAY_REQ)
 149                         x->rx_msg_type_pdelay_req++;
 150                 else if (p->des4.erx.msg_type == RDES_EXT_PDELAY_RESP)
 151                         x->rx_msg_type_pdelay_resp++;
 152                 else if (p->des4.erx.msg_type == RDES_EXT_PDELAY_FOLLOW_UP)
 153                         x->rx_msg_type_pdelay_follow_up++;
 154                 else
 155                         x->rx_msg_type_ext_no_ptp++;
 156                 if (p->des4.erx.ptp_frame_type)
 157                         x->ptp_frame_type++;
 158                 if (p->des4.erx.ptp_ver)
 159                         x->ptp_ver++;
 160                 if (p->des4.erx.timestamp_dropped)
 161                         x->timestamp_dropped++;
 162                 if (p->des4.erx.av_pkt_rcvd)
 163                         x->av_pkt_rcvd++;
 164                 if (p->des4.erx.av_tagged_pkt_rcvd)
 165                         x->av_tagged_pkt_rcvd++;
 166                 if (p->des4.erx.vlan_tag_priority_val)
 167                         x->vlan_tag_priority_val++;
 168                 if (p->des4.erx.l3_filter_match)
 169                         x->l3_filter_match++;
 170                 if (p->des4.erx.l4_filter_match)
 171                         x->l4_filter_match++;
 172                 if (p->des4.erx.l3_l4_filter_no_match)
 173                         x->l3_l4_filter_no_match++;
 174         }
 175 }
 176
 177 static int enh_desc_get_rx_status(void *data, struct stmmac_extra_stats *x,
 178                                   struct dma_desc *p)
 179 {
 180         int ret = good_frame;
 181         struct net_device_stats *stats = (struct net_device_stats *)data;
 182
 183         if (unlikely(p->des01.erx.error_summary)) {
 184                 if (unlikely(p->des01.erx.descriptor_error)) {
 185                         x->rx_desc++;
 186                         stats->rx_length_errors++;
 187                 }
 188                 if (unlikely(p->des01.erx.overflow_error))
 189                         x->rx_gmac_overflow++;
 190
 191                 if (unlikely(p->des01.erx.ipc_csum_error))
 192                         pr_err("\tIPC Csum Error/Giant frame\n");
 193
 194                 if (unlikely(p->des01.erx.late_collision)) {
 195                         stats->collisions++;
 196                 }
 197                 if (unlikely(p->des01.erx.receive_watchdog))
 198                         x->rx_watchdog++;
 199
 200                 if (unlikely(p->des01.erx.error_gmii))
 201                         x->rx_mii++;
 202
 203                 if (unlikely(p->des01.erx.crc_error)) {
 204                         x->rx_crc++;
 205                         stats->rx_crc_errors++;
 206                 }
 207                 ret = discard_frame;
 208         }
 209
 210         /* After a payload csum error, the ES bit is set.
 211          * It doesn't match with the information reported into the databook.
 212          * At any rate, we need to understand if the CSUM hw computation is ok
 213          * and report this info to the upper layers. */
 214         ret = enh_desc_coe_rdes0(p->des01.erx.ipc_csum_error,
 215                 p->des01.erx.frame_type, p->des01.erx.rx_mac_addr);
 216
 217         if (unlikely(p->des01.erx.dribbling))
 218                 x->dribbling_bit++;
 219
 220         if (unlikely(p->des01.erx.sa_filter_fail)) {
 221                 x->sa_rx_filter_fail++;
 222                 ret = discard_frame;
 223         }
 224         if (unlikely(p->des01.erx.da_filter_fail)) {
 225                 x->da_rx_filter_fail++;
 226                 ret = discard_frame;
 227         }
 228         if (unlikely(p->des01.erx.length_error)) {
 229                 x->rx_length++;
 230                 ret = discard_frame;
 231         }
 232 #ifdef STMMAC_VLAN_TAG_USED
 233         if (p->des01.erx.vlan_tag)
 234                 x->rx_vlan++;
 235 #endif
 236
 237         return ret;
 238 }
 239
 240 static void enh_desc_init_rx_desc(struct dma_desc *p, int disable_rx_ic,
 241                                   int mode, int end)
 242 {
 243         p->des01.all_flags = 0;
 244         p->des01.erx.own = 1;
 245         p->des01.erx.buffer1_size = BUF_SIZE_8KiB - 1;
 246
 247         if (mode == STMMAC_CHAIN_MODE)
 248                 ehn_desc_rx_set_on_chain(p, end);
 249         else
 250                 ehn_desc_rx_set_on_ring(p, end);
 251
 252         if (disable_rx_ic)
 253                 p->des01.erx.disable_ic = 1;
 254 }
 255
 256 static void enh_desc_init_tx_desc(struct dma_desc *p, int mode, int end)
 257 {
 258         p->des01.all_flags = 0;
 259         if (mode == STMMAC_CHAIN_MODE)
 260                 ehn_desc_tx_set_on_chain(p, end);
 261         else
 262                 ehn_desc_tx_set_on_ring(p, end);
 263 }
 264
 265 static int enh_desc_get_tx_owner(struct dma_desc *p)
 266 {
 267         return p->des01.etx.own;
 268 }
 269
 270 static int enh_desc_get_rx_owner(struct dma_desc *p)
 271 {
 272         return p->des01.erx.own;
 273 }
 274
 275 static void enh_desc_set_tx_owner(struct dma_desc *p)
 276 {
 277         p->des01.etx.own = 1;
 278 }
 279
 280 static void enh_desc_set_rx_owner(struct dma_desc *p)
 281 {
 282         p->des01.erx.own = 1;
 283 }
 284
 285 static int enh_desc_get_tx_ls(struct dma_desc *p)
 286 {
 287         return p->des01.etx.last_segment;
 288 }
 289
 290 static void enh_desc_release_tx_desc(struct dma_desc *p, int mode)
 291 {
 292         int ter = p->des01.etx.end_ring;
 293
 294         memset(p, 0, offsetof(struct dma_desc, des2));
 295         if (mode == STMMAC_CHAIN_MODE)
 296                 enh_desc_end_tx_desc_on_chain(p, ter);
 297         else
 298                 enh_desc_end_tx_desc_on_ring(p, ter);
 299 }
 300
 301 static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 302                                      int csum_flag, int mode)
 303 {
 304         p->des01.etx.first_segment = is_fs;
 305
 306         if (mode == STMMAC_CHAIN_MODE)
 307                 enh_set_tx_desc_len_on_chain(p, len);
 308         else
 309                 enh_set_tx_desc_len_on_ring(p, len);
 310
 311         if (likely(csum_flag))
 312                 p->des01.etx.checksum_insertion = cic_full;
 313 }
 314
 315 static void enh_desc_clear_tx_ic(struct dma_desc *p)
 316 {
 317         p->des01.etx.interrupt = 0;
 318 }
 319
 320 static void enh_desc_close_tx_desc(struct dma_desc *p)
 321 {
 322         p->des01.etx.last_segment = 1;
 323         p->des01.etx.interrupt = 1;
 324 }
 325
 326 static int enh_desc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
 327 {
 328         /* The type-1 checksum offload engines append the checksum at
 329          * the end of frame and the two bytes of checksum are added in
 330          * the length.
 331          * Adjust for that in the framelen for type-1 checksum offload
 332          * engines. */
 333         if (rx_coe_type == STMMAC_RX_COE_TYPE1)
 334                 return p->des01.erx.frame_length - 2;
 335         else
 336                 return p->des01.erx.frame_length;
 337 }
 338
 339 static void enh_desc_enable_tx_timestamp(struct dma_desc *p)
 340 {
 341         p->des01.etx.time_stamp_enable = 1;
 342 }
 343
 344 static int enh_desc_get_tx_timestamp_status(struct dma_desc *p)
 345 {
 346         return p->des01.etx.time_stamp_status;
 347 }
 348
 349 static u64 enh_desc_get_timestamp(void *desc, u32 ats)
 350 {
 351         u64 ns;
 352
 353         if (ats) {
 354                 struct dma_extended_desc *p = (struct dma_extended_desc *)desc;
 355                 ns = p->des6;
 356                 /* convert high/sec time stamp value to nanosecond */
 357                 ns += p->des7 * 1000000000ULL;
 358         } else {
 359                 struct dma_desc *p = (struct dma_desc *)desc;
 360                 ns = p->des2;
 361                 ns += p->des3 * 1000000000ULL;
 362         }
 363
 364         return ns;
 365 }
 366
 367 static int enh_desc_get_rx_timestamp_status(void *desc, u32 ats)
 368 {
 369         if (ats) {
 370                 struct dma_extended_desc *p = (struct dma_extended_desc *)desc;
 371                 return p->basic.des01.erx.ipc_csum_error;
 372         } else {
 373                 struct dma_desc *p = (struct dma_desc *)desc;
 374                 if ((p->des2 == 0xffffffff) && (p->des3 == 0xffffffff))
 375                         /* timestamp is corrupted, hence don't store it */
 376                         return 0;
 377                 else
 378                         return 1;
 379         }
 380 }
 381
 382 const struct stmmac_desc_ops enh_desc_ops = {
 383         .tx_status = enh_desc_get_tx_status,
 384         .rx_status = enh_desc_get_rx_status,
 385         .get_tx_len = enh_desc_get_tx_len,
 386         .init_rx_desc = enh_desc_init_rx_desc,
 387         .init_tx_desc = enh_desc_init_tx_desc,
 388         .get_tx_owner = enh_desc_get_tx_owner,
 389         .get_rx_owner = enh_desc_get_rx_owner,
 390         .release_tx_desc = enh_desc_release_tx_desc,
 391         .prepare_tx_desc = enh_desc_prepare_tx_desc,
 392         .clear_tx_ic = enh_desc_clear_tx_ic,
 393         .close_tx_desc = enh_desc_close_tx_desc,
 394         .get_tx_ls = enh_desc_get_tx_ls,
 395         .set_tx_owner = enh_desc_set_tx_owner,
 396         .set_rx_owner = enh_desc_set_rx_owner,
 397         .get_rx_frame_len = enh_desc_get_rx_frame_len,
 398         .rx_extended_status = enh_desc_get_ext_status,
 399         .enable_tx_timestamp = enh_desc_enable_tx_timestamp,
 400         .get_tx_timestamp_status = enh_desc_get_tx_timestamp_status,
 401         .get_timestamp = enh_desc_get_timestamp,
 402         .get_rx_timestamp_status = enh_desc_get_rx_timestamp_status,
 403 };