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

   1 /*******************************************************************************
   2   This contains the functions to handle the normal 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 ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x,
  30                                struct dma_desc *p, void __iomem *ioaddr)
  31 {
  32         struct net_device_stats *stats = (struct net_device_stats *)data;
  33         unsigned int tdes0 = p->des0;
  34         unsigned int tdes1 = p->des1;
  35         int ret = tx_done;
  36
  37         /* Get tx owner first */
  38         if (unlikely(tdes0 & TDES0_OWN))
  39                 return tx_dma_own;
  40
  41         /* Verify tx error by looking at the last segment. */
  42         if (likely(!(tdes1 & TDES1_LAST_SEGMENT)))
  43                 return tx_not_ls;
  44
  45         if (unlikely(tdes0 & TDES0_ERROR_SUMMARY)) {
  46                 if (unlikely(tdes0 & TDES0_UNDERFLOW_ERROR)) {
  47                         x->tx_underflow++;
  48                         stats->tx_fifo_errors++;
  49                 }
  50                 if (unlikely(tdes0 & TDES0_NO_CARRIER)) {
  51                         x->tx_carrier++;
  52                         stats->tx_carrier_errors++;
  53                 }
  54                 if (unlikely(tdes0 & TDES0_LOSS_CARRIER)) {
  55                         x->tx_losscarrier++;
  56                         stats->tx_carrier_errors++;
  57                 }
  58                 if (unlikely((tdes0 & TDES0_EXCESSIVE_DEFERRAL) ||
  59                              (tdes0 & TDES0_EXCESSIVE_COLLISIONS) ||
  60                              (tdes0 & TDES0_LATE_COLLISION))) {
  61                         unsigned int collisions;
  62
  63                         collisions = (tdes0 & TDES0_COLLISION_COUNT_MASK) >> 3;
  64                         stats->collisions += collisions;
  65                 }
  66                 ret = tx_err;
  67         }
  68
  69         if (tdes0 & TDES0_VLAN_FRAME)
  70                 x->tx_vlan++;
  71
  72         if (unlikely(tdes0 & TDES0_DEFERRED))
  73                 x->tx_deferred++;
  74
  75         return ret;
  76 }
  77
  78 static int ndesc_get_tx_len(struct dma_desc *p)
  79 {
  80         return (p->des1 & RDES1_BUFFER1_SIZE_MASK);
  81 }
  82
  83 /* This function verifies if each incoming frame has some errors
  84  * and, if required, updates the multicast statistics.
  85  * In case of success, it returns good_frame because the GMAC device
  86  * is supposed to be able to compute the csum in HW. */
  87 static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
  88                                struct dma_desc *p)
  89 {
  90         int ret = good_frame;
  91         unsigned int rdes0 = p->des0;
  92         struct net_device_stats *stats = (struct net_device_stats *)data;
  93
  94         if (unlikely(rdes0 & RDES0_OWN))
  95                 return dma_own;
  96
  97         if (unlikely(!(rdes0 & RDES0_LAST_DESCRIPTOR))) {
  98                 pr_warn("%s: Oversized frame spanned multiple buffers\n",
  99                         __func__);
 100                 stats->rx_length_errors++;
 101                 return discard_frame;
 102         }
 103
 104         if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
 105                 if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR))
 106                         x->rx_desc++;
 107                 if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL))
 108                         x->sa_filter_fail++;
 109                 if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
 110                         x->overflow_error++;
 111                 if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
 112                         x->ipc_csum_error++;
 113                 if (unlikely(rdes0 & RDES0_COLLISION)) {
 114                         x->rx_collision++;
 115                         stats->collisions++;
 116                 }
 117                 if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
 118                         x->rx_crc++;
 119                         stats->rx_crc_errors++;
 120                 }
 121                 ret = discard_frame;
 122         }
 123         if (unlikely(rdes0 & RDES0_DRIBBLING))
 124                 x->dribbling_bit++;
 125
 126         if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
 127                 x->rx_length++;
 128                 ret = discard_frame;
 129         }
 130         if (unlikely(rdes0 & RDES0_MII_ERROR)) {
 131                 x->rx_mii++;
 132                 ret = discard_frame;
 133         }
 134 #ifdef STMMAC_VLAN_TAG_USED
 135         if (rdes0 & RDES0_VLAN_TAG)
 136                 x->vlan_tag++;
 137 #endif
 138         return ret;
 139 }
 140
 141 static void ndesc_init_rx_desc(struct dma_desc *p, int disable_rx_ic, int mode,
 142                                int end)
 143 {
 144         p->des0 |= RDES0_OWN;
 145         p->des1 |= (BUF_SIZE_2KiB - 1) & RDES1_BUFFER1_SIZE_MASK;
 146
 147         if (mode == STMMAC_CHAIN_MODE)
 148                 ndesc_rx_set_on_chain(p, end);
 149         else
 150                 ndesc_rx_set_on_ring(p, end);
 151
 152         if (disable_rx_ic)
 153                 p->des1 |= RDES1_DISABLE_IC;
 154 }
 155
 156 static void ndesc_init_tx_desc(struct dma_desc *p, int mode, int end)
 157 {
 158         p->des0 &= ~TDES0_OWN;
 159         if (mode == STMMAC_CHAIN_MODE)
 160                 ndesc_tx_set_on_chain(p);
 161         else
 162                 ndesc_end_tx_desc_on_ring(p, end);
 163 }
 164
 165 static int ndesc_get_tx_owner(struct dma_desc *p)
 166 {
 167         return (p->des0 & TDES0_OWN) >> 31;
 168 }
 169
 170 static void ndesc_set_tx_owner(struct dma_desc *p)
 171 {
 172         p->des0 |= TDES0_OWN;
 173 }
 174
 175 static void ndesc_set_rx_owner(struct dma_desc *p)
 176 {
 177         p->des0 |= RDES0_OWN;
 178 }
 179
 180 static int ndesc_get_tx_ls(struct dma_desc *p)
 181 {
 182         return (p->des1 & TDES1_LAST_SEGMENT) >> 30;
 183 }
 184
 185 static void ndesc_release_tx_desc(struct dma_desc *p, int mode)
 186 {
 187         int ter = (p->des1 & TDES1_END_RING) >> 25;
 188
 189         memset(p, 0, offsetof(struct dma_desc, des2));
 190         if (mode == STMMAC_CHAIN_MODE)
 191                 ndesc_tx_set_on_chain(p);
 192         else
 193                 ndesc_end_tx_desc_on_ring(p, ter);
 194 }
 195
 196 static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 197                                   bool csum_flag, int mode, bool tx_own,
 198                                   bool ls)
 199 {
 200         unsigned int tdes1 = p->des1;
 201
 202         if (is_fs)
 203                 tdes1 |= TDES1_FIRST_SEGMENT;
 204         else
 205                 tdes1 &= ~TDES1_FIRST_SEGMENT;
 206
 207         if (likely(csum_flag))
 208                 tdes1 |= (TX_CIC_FULL) << TDES1_CHECKSUM_INSERTION_SHIFT;
 209         else
 210                 tdes1 &= ~(TX_CIC_FULL << TDES1_CHECKSUM_INSERTION_SHIFT);
 211
 212         if (ls)
 213                 tdes1 |= TDES1_LAST_SEGMENT;
 214
 215         p->des1 = tdes1;
 216
 217         if (mode == STMMAC_CHAIN_MODE)
 218                 norm_set_tx_desc_len_on_chain(p, len);
 219         else
 220                 norm_set_tx_desc_len_on_ring(p, len);
 221
 222         if (tx_own)
 223                 p->des0 |= TDES0_OWN;
 224 }
 225
 226 static void ndesc_set_tx_ic(struct dma_desc *p)
 227 {
 228         p->des1 |= TDES1_INTERRUPT;
 229 }
 230
 231 static int ndesc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
 232 {
 233         unsigned int csum = 0;
 234
 235         /* The type-1 checksum offload engines append the checksum at
 236          * the end of frame and the two bytes of checksum are added in
 237          * the length.
 238          * Adjust for that in the framelen for type-1 checksum offload
 239          * engines
 240          */
 241         if (rx_coe_type == STMMAC_RX_COE_TYPE1)
 242                 csum = 2;
 243
 244         return (((p->des0 & RDES0_FRAME_LEN_MASK) >> RDES0_FRAME_LEN_SHIFT) -
 245                 csum);
 246
 247 }
 248
 249 static void ndesc_enable_tx_timestamp(struct dma_desc *p)
 250 {
 251         p->des1 |= TDES1_TIME_STAMP_ENABLE;
 252 }
 253
 254 static int ndesc_get_tx_timestamp_status(struct dma_desc *p)
 255 {
 256         return (p->des0 & TDES0_TIME_STAMP_STATUS) >> 17;
 257 }
 258
 259 static u64 ndesc_get_timestamp(void *desc, u32 ats)
 260 {
 261         struct dma_desc *p = (struct dma_desc *)desc;
 262         u64 ns;
 263
 264         ns = p->des2;
 265         /* convert high/sec time stamp value to nanosecond */
 266         ns += p->des3 * 1000000000ULL;
 267
 268         return ns;
 269 }
 270
 271 static int ndesc_get_rx_timestamp_status(void *desc, u32 ats)
 272 {
 273         struct dma_desc *p = (struct dma_desc *)desc;
 274
 275         if ((p->des2 == 0xffffffff) && (p->des3 == 0xffffffff))
 276                 /* timestamp is corrupted, hence don't store it */
 277                 return 0;
 278         else
 279                 return 1;
 280 }
 281
 282 const struct stmmac_desc_ops ndesc_ops = {
 283         .tx_status = ndesc_get_tx_status,
 284         .rx_status = ndesc_get_rx_status,
 285         .get_tx_len = ndesc_get_tx_len,
 286         .init_rx_desc = ndesc_init_rx_desc,
 287         .init_tx_desc = ndesc_init_tx_desc,
 288         .get_tx_owner = ndesc_get_tx_owner,
 289         .release_tx_desc = ndesc_release_tx_desc,
 290         .prepare_tx_desc = ndesc_prepare_tx_desc,
 291         .set_tx_ic = ndesc_set_tx_ic,
 292         .get_tx_ls = ndesc_get_tx_ls,
 293         .set_tx_owner = ndesc_set_tx_owner,
 294         .set_rx_owner = ndesc_set_rx_owner,
 295         .get_rx_frame_len = ndesc_get_rx_frame_len,
 296         .enable_tx_timestamp = ndesc_enable_tx_timestamp,
 297         .get_tx_timestamp_status = ndesc_get_tx_timestamp_status,
 298         .get_timestamp = ndesc_get_timestamp,
 299         .get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
 300 };