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 "common.h"
  26 #include "descs_com.h"
  27
  28 static int ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x,
  29                                struct dma_desc *p, void __iomem *ioaddr)
  30 {
  31         int ret = 0;
  32         struct net_device_stats *stats = (struct net_device_stats *)data;
  33
  34         if (unlikely(p->des01.tx.error_summary)) {
  35                 if (unlikely(p->des01.tx.underflow_error)) {
  36                         x->tx_underflow++;
  37                         stats->tx_fifo_errors++;
  38                 }
  39                 if (unlikely(p->des01.tx.no_carrier)) {
  40                         x->tx_carrier++;
  41                         stats->tx_carrier_errors++;
  42                 }
  43                 if (unlikely(p->des01.tx.loss_carrier)) {
  44                         x->tx_losscarrier++;
  45                         stats->tx_carrier_errors++;
  46                 }
  47                 if (unlikely((p->des01.tx.excessive_deferral) ||
  48                              (p->des01.tx.excessive_collisions) ||
  49                              (p->des01.tx.late_collision)))
  50                         stats->collisions += p->des01.tx.collision_count;
  51                 ret = -1;
  52         }
  53         if (unlikely(p->des01.tx.heartbeat_fail)) {
  54                 x->tx_heartbeat++;
  55                 stats->tx_heartbeat_errors++;
  56                 ret = -1;
  57         }
  58         if (unlikely(p->des01.tx.deferred))
  59                 x->tx_deferred++;
  60
  61         return ret;
  62 }
  63
  64 static int ndesc_get_tx_len(struct dma_desc *p)
  65 {
  66         return p->des01.tx.buffer1_size;
  67 }
  68
  69 /* This function verifies if each incoming frame has some errors
  70  * and, if required, updates the multicast statistics.
  71  * In case of success, it returns csum_none because the device
  72  * is not able to compute the csum in HW. */
  73 static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
  74                                struct dma_desc *p)
  75 {
  76         int ret = csum_none;
  77         struct net_device_stats *stats = (struct net_device_stats *)data;
  78
  79         if (unlikely(p->des01.rx.last_descriptor == 0)) {
  80                 pr_warning("ndesc Error: Oversized Ethernet "
  81                            "frame spanned multiple buffers\n");
  82                 stats->rx_length_errors++;
  83                 return discard_frame;
  84         }
  85
  86         if (unlikely(p->des01.rx.error_summary)) {
  87                 if (unlikely(p->des01.rx.descriptor_error))
  88                         x->rx_desc++;
  89                 if (unlikely(p->des01.rx.partial_frame_error))
  90                         x->rx_partial++;
  91                 if (unlikely(p->des01.rx.run_frame))
  92                         x->rx_runt++;
  93                 if (unlikely(p->des01.rx.frame_too_long))
  94                         x->rx_toolong++;
  95                 if (unlikely(p->des01.rx.collision)) {
  96                         x->rx_collision++;
  97                         stats->collisions++;
  98                 }
  99                 if (unlikely(p->des01.rx.crc_error)) {
 100                         x->rx_crc++;
 101                         stats->rx_crc_errors++;
 102                 }
 103                 ret = discard_frame;
 104         }
 105         if (unlikely(p->des01.rx.dribbling))
 106                 ret = discard_frame;
 107
 108         if (unlikely(p->des01.rx.length_error)) {
 109                 x->rx_length++;
 110                 ret = discard_frame;
 111         }
 112         if (unlikely(p->des01.rx.mii_error)) {
 113                 x->rx_mii++;
 114                 ret = discard_frame;
 115         }
 116         if (p->des01.rx.multicast_frame) {
 117                 x->rx_multicast++;
 118                 stats->multicast++;
 119         }
 120         return ret;
 121 }
 122
 123 static void ndesc_init_rx_desc(struct dma_desc *p, unsigned int ring_size,
 124                                int disable_rx_ic)
 125 {
 126         int i;
 127         for (i = 0; i < ring_size; i++) {
 128                 p->des01.rx.own = 1;
 129                 p->des01.rx.buffer1_size = BUF_SIZE_2KiB - 1;
 130
 131                 ndesc_rx_set_on_ring_chain(p, (i == ring_size - 1));
 132
 133                 if (disable_rx_ic)
 134                         p->des01.rx.disable_ic = 1;
 135                 p++;
 136         }
 137 }
 138
 139 static void ndesc_init_tx_desc(struct dma_desc *p, unsigned int ring_size)
 140 {
 141         int i;
 142         for (i = 0; i < ring_size; i++) {
 143                 p->des01.tx.own = 0;
 144                 ndesc_tx_set_on_ring_chain(p, (i == (ring_size - 1)));
 145                 p++;
 146         }
 147 }
 148
 149 static int ndesc_get_tx_owner(struct dma_desc *p)
 150 {
 151         return p->des01.tx.own;
 152 }
 153
 154 static int ndesc_get_rx_owner(struct dma_desc *p)
 155 {
 156         return p->des01.rx.own;
 157 }
 158
 159 static void ndesc_set_tx_owner(struct dma_desc *p)
 160 {
 161         p->des01.tx.own = 1;
 162 }
 163
 164 static void ndesc_set_rx_owner(struct dma_desc *p)
 165 {
 166         p->des01.rx.own = 1;
 167 }
 168
 169 static int ndesc_get_tx_ls(struct dma_desc *p)
 170 {
 171         return p->des01.tx.last_segment;
 172 }
 173
 174 static void ndesc_release_tx_desc(struct dma_desc *p)
 175 {
 176         int ter = p->des01.tx.end_ring;
 177
 178         memset(p, 0, offsetof(struct dma_desc, des2));
 179         ndesc_end_tx_desc(p, 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         norm_set_tx_desc_len(p, 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 };