| /******************************************************************************* |
| This contains the functions to handle the normal descriptors. |
| |
| Copyright (C) 2007-2009 STMicroelectronics Ltd |
| |
| This program is free software; you can redistribute it and/or modify it |
| under the terms and conditions of the GNU General Public License, |
| version 2, as published by the Free Software Foundation. |
| |
| This program is distributed in the hope it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| more details. |
| |
| You should have received a copy of the GNU General Public License along with |
| this program; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| |
| The full GNU General Public License is included in this distribution in |
| the file called "COPYING". |
| |
| Author: Giuseppe Cavallaro <peppe.cavallaro@st.com> |
| *******************************************************************************/ |
| |
| #include "common.h" |
| |
| static int ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x, |
| struct dma_desc *p, unsigned long ioaddr) |
| { |
| int ret = 0; |
| struct net_device_stats *stats = (struct net_device_stats *)data; |
| |
| if (unlikely(p->des01.tx.error_summary)) { |
| if (unlikely(p->des01.tx.underflow_error)) { |
| x->tx_underflow++; |
| stats->tx_fifo_errors++; |
| } |
| if (unlikely(p->des01.tx.no_carrier)) { |
| x->tx_carrier++; |
| stats->tx_carrier_errors++; |
| } |
| if (unlikely(p->des01.tx.loss_carrier)) { |
| x->tx_losscarrier++; |
| stats->tx_carrier_errors++; |
| } |
| if (unlikely((p->des01.tx.excessive_deferral) || |
| (p->des01.tx.excessive_collisions) || |
| (p->des01.tx.late_collision))) |
| stats->collisions += p->des01.tx.collision_count; |
| ret = -1; |
| } |
| if (unlikely(p->des01.tx.heartbeat_fail)) { |
| x->tx_heartbeat++; |
| stats->tx_heartbeat_errors++; |
| ret = -1; |
| } |
| if (unlikely(p->des01.tx.deferred)) |
| x->tx_deferred++; |
| |
| return ret; |
| } |
| |
| static int ndesc_get_tx_len(struct dma_desc *p) |
| { |
| return p->des01.tx.buffer1_size; |
| } |
| |
| /* This function verifies if each incoming frame has some errors |
| * and, if required, updates the multicast statistics. |
| * In case of success, it returns csum_none becasue the device |
| * is not able to compute the csum in HW. */ |
| static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x, |
| struct dma_desc *p) |
| { |
| int ret = csum_none; |
| struct net_device_stats *stats = (struct net_device_stats *)data; |
| |
| if (unlikely(p->des01.rx.last_descriptor == 0)) { |
| pr_warning("ndesc Error: Oversized Ethernet " |
| "frame spanned multiple buffers\n"); |
| stats->rx_length_errors++; |
| return discard_frame; |
| } |
| |
| if (unlikely(p->des01.rx.error_summary)) { |
| if (unlikely(p->des01.rx.descriptor_error)) |
| x->rx_desc++; |
| if (unlikely(p->des01.rx.partial_frame_error)) |
| x->rx_partial++; |
| if (unlikely(p->des01.rx.run_frame)) |
| x->rx_runt++; |
| if (unlikely(p->des01.rx.frame_too_long)) |
| x->rx_toolong++; |
| if (unlikely(p->des01.rx.collision)) { |
| x->rx_collision++; |
| stats->collisions++; |
| } |
| if (unlikely(p->des01.rx.crc_error)) { |
| x->rx_crc++; |
| stats->rx_crc_errors++; |
| } |
| ret = discard_frame; |
| } |
| if (unlikely(p->des01.rx.dribbling)) |
| ret = discard_frame; |
| |
| if (unlikely(p->des01.rx.length_error)) { |
| x->rx_length++; |
| ret = discard_frame; |
| } |
| if (unlikely(p->des01.rx.mii_error)) { |
| x->rx_mii++; |
| ret = discard_frame; |
| } |
| if (p->des01.rx.multicast_frame) { |
| x->rx_multicast++; |
| stats->multicast++; |
| } |
| return ret; |
| } |
| |
| static void ndesc_init_rx_desc(struct dma_desc *p, unsigned int ring_size, |
| int disable_rx_ic) |
| { |
| int i; |
| for (i = 0; i < ring_size; i++) { |
| p->des01.rx.own = 1; |
| p->des01.rx.buffer1_size = BUF_SIZE_2KiB - 1; |
| if (i == ring_size - 1) |
| p->des01.rx.end_ring = 1; |
| if (disable_rx_ic) |
| p->des01.rx.disable_ic = 1; |
| p++; |
| } |
| return; |
| } |
| |
| static void ndesc_init_tx_desc(struct dma_desc *p, unsigned int ring_size) |
| { |
| int i; |
| for (i = 0; i < ring_size; i++) { |
| p->des01.tx.own = 0; |
| if (i == ring_size - 1) |
| p->des01.tx.end_ring = 1; |
| p++; |
| } |
| return; |
| } |
| |
| static int ndesc_get_tx_owner(struct dma_desc *p) |
| { |
| return p->des01.tx.own; |
| } |
| |
| static int ndesc_get_rx_owner(struct dma_desc *p) |
| { |
| return p->des01.rx.own; |
| } |
| |
| static void ndesc_set_tx_owner(struct dma_desc *p) |
| { |
| p->des01.tx.own = 1; |
| } |
| |
| static void ndesc_set_rx_owner(struct dma_desc *p) |
| { |
| p->des01.rx.own = 1; |
| } |
| |
| static int ndesc_get_tx_ls(struct dma_desc *p) |
| { |
| return p->des01.tx.last_segment; |
| } |
| |
| static void ndesc_release_tx_desc(struct dma_desc *p) |
| { |
| int ter = p->des01.tx.end_ring; |
| |
| /* clean field used within the xmit */ |
| p->des01.tx.first_segment = 0; |
| p->des01.tx.last_segment = 0; |
| p->des01.tx.buffer1_size = 0; |
| |
| /* clean status reported */ |
| p->des01.tx.error_summary = 0; |
| p->des01.tx.underflow_error = 0; |
| p->des01.tx.no_carrier = 0; |
| p->des01.tx.loss_carrier = 0; |
| p->des01.tx.excessive_deferral = 0; |
| p->des01.tx.excessive_collisions = 0; |
| p->des01.tx.late_collision = 0; |
| p->des01.tx.heartbeat_fail = 0; |
| p->des01.tx.deferred = 0; |
| |
| /* set termination field */ |
| p->des01.tx.end_ring = ter; |
| |
| return; |
| } |
| |
| static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len, |
| int csum_flag) |
| { |
| p->des01.tx.first_segment = is_fs; |
| p->des01.tx.buffer1_size = len; |
| } |
| |
| static void ndesc_clear_tx_ic(struct dma_desc *p) |
| { |
| p->des01.tx.interrupt = 0; |
| } |
| |
| static void ndesc_close_tx_desc(struct dma_desc *p) |
| { |
| p->des01.tx.last_segment = 1; |
| p->des01.tx.interrupt = 1; |
| } |
| |
| static int ndesc_get_rx_frame_len(struct dma_desc *p) |
| { |
| return p->des01.rx.frame_length; |
| } |
| |
| struct stmmac_desc_ops ndesc_ops = { |
| .tx_status = ndesc_get_tx_status, |
| .rx_status = ndesc_get_rx_status, |
| .get_tx_len = ndesc_get_tx_len, |
| .init_rx_desc = ndesc_init_rx_desc, |
| .init_tx_desc = ndesc_init_tx_desc, |
| .get_tx_owner = ndesc_get_tx_owner, |
| .get_rx_owner = ndesc_get_rx_owner, |
| .release_tx_desc = ndesc_release_tx_desc, |
| .prepare_tx_desc = ndesc_prepare_tx_desc, |
| .clear_tx_ic = ndesc_clear_tx_ic, |
| .close_tx_desc = ndesc_close_tx_desc, |
| .get_tx_ls = ndesc_get_tx_ls, |
| .set_tx_owner = ndesc_set_tx_owner, |
| .set_rx_owner = ndesc_set_rx_owner, |
| .get_rx_frame_len = ndesc_get_rx_frame_len, |
| }; |