drivers/net/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 "common.h"
  26
  27 static int ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x,
  28                                struct dma_desc *p, void __iomem *ioaddr)
  29 {
  30         int ret = 0;
  31         struct net_device_stats *stats = (struct net_device_stats *)data;
  32
  33         if (unlikely(p->des01.tx.error_summary)) {
  34                 if (unlikely(p->des01.tx.underflow_error)) {
  35                         x->tx_underflow++;
  36                         stats->tx_fifo_errors++;
  37                 }
  38                 if (unlikely(p->des01.tx.no_carrier)) {
  39                         x->tx_carrier++;
  40                         stats->tx_carrier_errors++;
  41                 }
  42                 if (unlikely(p->des01.tx.loss_carrier)) {
  43                         x->tx_losscarrier++;
  44                         stats->tx_carrier_errors++;
  45                 }
  46                 if (unlikely((p->des01.tx.excessive_deferral) ||
  47                              (p->des01.tx.excessive_collisions) ||
  48                              (p->des01.tx.late_collision)))
  49                         stats->collisions += p->des01.tx.collision_count;
  50                 ret = -1;
  51         }
  52         if (unlikely(p->des01.tx.heartbeat_fail)) {
  53                 x->tx_heartbeat++;
  54                 stats->tx_heartbeat_errors++;
  55                 ret = -1;
  56         }
  57         if (unlikely(p->des01.tx.deferred))
  58                 x->tx_deferred++;
  59
  60         return ret;
  61 }
  62
  63 static int ndesc_get_tx_len(struct dma_desc *p)
  64 {
  65         return p->des01.tx.buffer1_size;
  66 }
  67
  68 /* This function verifies if each incoming frame has some errors
  69  * and, if required, updates the multicast statistics.
  70  * In case of success, it returns csum_none because the device
  71  * is not able to compute the csum in HW. */
  72 static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
  73                                struct dma_desc *p)
  74 {
  75         int ret = csum_none;
  76         struct net_device_stats *stats = (struct net_device_stats *)data;
  77
  78         if (unlikely(p->des01.rx.last_descriptor == 0)) {
  79                 pr_warning("ndesc Error: Oversized Ethernet "
  80                            "frame spanned multiple buffers\n");
  81                 stats->rx_length_errors++;
  82                 return discard_frame;
  83         }
  84
  85         if (unlikely(p->des01.rx.error_summary)) {
  86                 if (unlikely(p->des01.rx.descriptor_error))
  87                         x->rx_desc++;
  88                 if (unlikely(p->des01.rx.partial_frame_error))
  89                         x->rx_partial++;
  90                 if (unlikely(p->des01.rx.run_frame))
  91                         x->rx_runt++;
  92                 if (unlikely(p->des01.rx.frame_too_long))
  93                         x->rx_toolong++;
  94                 if (unlikely(p->des01.rx.collision)) {
  95                         x->rx_collision++;
  96                         stats->collisions++;
  97                 }
  98                 if (unlikely(p->des01.rx.crc_error)) {
  99                         x->rx_crc++;
 100                         stats->rx_crc_errors++;
 101                 }
 102                 ret = discard_frame;
 103         }
 104         if (unlikely(p->des01.rx.dribbling))
 105                 ret = discard_frame;
 106
 107         if (unlikely(p->des01.rx.length_error)) {
 108                 x->rx_length++;
 109                 ret = discard_frame;
 110         }
 111         if (unlikely(p->des01.rx.mii_error)) {
 112                 x->rx_mii++;
 113                 ret = discard_frame;
 114         }
 115         if (p->des01.rx.multicast_frame) {
 116                 x->rx_multicast++;
 117                 stats->multicast++;
 118         }
 119         return ret;
 120 }
 121
 122 static void ndesc_init_rx_desc(struct dma_desc *p, unsigned int ring_size,
 123                                int disable_rx_ic)
 124 {
 125         int i;
 126         for (i = 0; i < ring_size; i++) {
 127                 p->des01.rx.own = 1;
 128                 p->des01.rx.buffer1_size = BUF_SIZE_2KiB - 1;
 129                 if (i == ring_size - 1)
 130                         p->des01.rx.end_ring = 1;
 131                 if (disable_rx_ic)
 132                         p->des01.rx.disable_ic = 1;
 133                 p++;
 134         }
 135 }
 136
 137 static void ndesc_init_tx_desc(struct dma_desc *p, unsigned int ring_size)
 138 {
 139         int i;
 140         for (i = 0; i < ring_size; i++) {
 141                 p->des01.tx.own = 0;
 142                 if (i == ring_size - 1)
 143                         p->des01.tx.end_ring = 1;
 144                 p++;
 145         }
 146 }
 147
 148 static int ndesc_get_tx_owner(struct dma_desc *p)
 149 {
 150         return p->des01.tx.own;
 151 }
 152
 153 static int ndesc_get_rx_owner(struct dma_desc *p)
 154 {
 155         return p->des01.rx.own;
 156 }
 157
 158 static void ndesc_set_tx_owner(struct dma_desc *p)
 159 {
 160         p->des01.tx.own = 1;
 161 }
 162
 163 static void ndesc_set_rx_owner(struct dma_desc *p)
 164 {
 165         p->des01.rx.own = 1;
 166 }
 167
 168 static int ndesc_get_tx_ls(struct dma_desc *p)
 169 {
 170         return p->des01.tx.last_segment;
 171 }
 172
 173 static void ndesc_release_tx_desc(struct dma_desc *p)
 174 {
 175         int ter = p->des01.tx.end_ring;
 176
 177         memset(p, 0, offsetof(struct dma_desc, des2));
 178         /* set termination field */
 179         p->des01.tx.end_ring = ter;
 180 }
 181
 182 static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 183                                   int csum_flag)
 184 {
 185         p->des01.tx.first_segment = is_fs;
 186         p->des01.tx.buffer1_size = len;
 187 }
 188
 189 static void ndesc_clear_tx_ic(struct dma_desc *p)
 190 {
 191         p->des01.tx.interrupt = 0;
 192 }
 193
 194 static void ndesc_close_tx_desc(struct dma_desc *p)
 195 {
 196         p->des01.tx.last_segment = 1;
 197         p->des01.tx.interrupt = 1;
 198 }
 199
 200 static int ndesc_get_rx_frame_len(struct dma_desc *p)
 201 {
 202         return p->des01.rx.frame_length;
 203 }
 204
 205 const struct stmmac_desc_ops ndesc_ops = {
 206         .tx_status = ndesc_get_tx_status,
 207         .rx_status = ndesc_get_rx_status,
 208         .get_tx_len = ndesc_get_tx_len,
 209         .init_rx_desc = ndesc_init_rx_desc,
 210         .init_tx_desc = ndesc_init_tx_desc,
 211         .get_tx_owner = ndesc_get_tx_owner,
 212         .get_rx_owner = ndesc_get_rx_owner,
 213         .release_tx_desc = ndesc_release_tx_desc,
 214         .prepare_tx_desc = ndesc_prepare_tx_desc,
 215         .clear_tx_ic = ndesc_clear_tx_ic,
 216         .close_tx_desc = ndesc_close_tx_desc,
 217         .get_tx_ls = ndesc_get_tx_ls,
 218         .set_tx_owner = ndesc_set_tx_owner,
 219         .set_rx_owner = ndesc_set_rx_owner,
 220         .get_rx_frame_len = ndesc_get_rx_frame_len,
 221 };