mirror of https://gitee.com/openkylin/linux.git
235 lines
6.1 KiB
C
235 lines
6.1 KiB
C
/*******************************************************************************
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This contains the functions to handle the normal descriptors.
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Copyright (C) 2007-2009 STMicroelectronics Ltd
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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*******************************************************************************/
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#include <linux/stmmac.h>
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#include "common.h"
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#include "descs_com.h"
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static int ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x,
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struct dma_desc *p, void __iomem *ioaddr)
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{
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int ret = 0;
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struct net_device_stats *stats = (struct net_device_stats *)data;
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if (unlikely(p->des01.tx.error_summary)) {
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if (unlikely(p->des01.tx.underflow_error)) {
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x->tx_underflow++;
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stats->tx_fifo_errors++;
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}
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if (unlikely(p->des01.tx.no_carrier)) {
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x->tx_carrier++;
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stats->tx_carrier_errors++;
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}
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if (unlikely(p->des01.tx.loss_carrier)) {
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x->tx_losscarrier++;
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stats->tx_carrier_errors++;
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}
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if (unlikely((p->des01.tx.excessive_deferral) ||
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(p->des01.tx.excessive_collisions) ||
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(p->des01.tx.late_collision)))
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stats->collisions += p->des01.tx.collision_count;
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ret = -1;
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}
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if (p->des01.etx.vlan_frame) {
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CHIP_DBG(KERN_INFO "GMAC TX status: VLAN frame\n");
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x->tx_vlan++;
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}
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if (unlikely(p->des01.tx.deferred))
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x->tx_deferred++;
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return ret;
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}
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static int ndesc_get_tx_len(struct dma_desc *p)
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{
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return p->des01.tx.buffer1_size;
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}
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/* This function verifies if each incoming frame has some errors
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* and, if required, updates the multicast statistics.
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* In case of success, it returns good_frame because the GMAC device
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* is supposed to be able to compute the csum in HW. */
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static int ndesc_get_rx_status(void *data, struct stmmac_extra_stats *x,
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struct dma_desc *p)
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{
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int ret = good_frame;
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struct net_device_stats *stats = (struct net_device_stats *)data;
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if (unlikely(p->des01.rx.last_descriptor == 0)) {
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pr_warning("ndesc Error: Oversized Ethernet "
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"frame spanned multiple buffers\n");
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stats->rx_length_errors++;
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return discard_frame;
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}
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if (unlikely(p->des01.rx.error_summary)) {
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if (unlikely(p->des01.rx.descriptor_error))
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x->rx_desc++;
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if (unlikely(p->des01.rx.sa_filter_fail))
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x->sa_filter_fail++;
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if (unlikely(p->des01.rx.overflow_error))
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x->overflow_error++;
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if (unlikely(p->des01.rx.ipc_csum_error))
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x->ipc_csum_error++;
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if (unlikely(p->des01.rx.collision)) {
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x->rx_collision++;
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stats->collisions++;
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}
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if (unlikely(p->des01.rx.crc_error)) {
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x->rx_crc++;
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stats->rx_crc_errors++;
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}
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ret = discard_frame;
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}
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if (unlikely(p->des01.rx.dribbling))
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x->dribbling_bit++;
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if (unlikely(p->des01.rx.length_error)) {
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x->rx_length++;
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ret = discard_frame;
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}
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if (unlikely(p->des01.rx.mii_error)) {
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x->rx_mii++;
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ret = discard_frame;
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}
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#ifdef STMMAC_VLAN_TAG_USED
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if (p->des01.rx.vlan_tag)
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x->vlan_tag++;
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#endif
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return ret;
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}
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static void ndesc_init_rx_desc(struct dma_desc *p, unsigned int ring_size,
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int disable_rx_ic)
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{
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int i;
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for (i = 0; i < ring_size; i++) {
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p->des01.rx.own = 1;
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p->des01.rx.buffer1_size = BUF_SIZE_2KiB - 1;
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ndesc_rx_set_on_ring_chain(p, (i == ring_size - 1));
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if (disable_rx_ic)
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p->des01.rx.disable_ic = 1;
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p++;
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}
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}
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static void ndesc_init_tx_desc(struct dma_desc *p, unsigned int ring_size)
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{
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int i;
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for (i = 0; i < ring_size; i++) {
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p->des01.tx.own = 0;
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ndesc_tx_set_on_ring_chain(p, (i == (ring_size - 1)));
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p++;
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}
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}
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static int ndesc_get_tx_owner(struct dma_desc *p)
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{
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return p->des01.tx.own;
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}
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static int ndesc_get_rx_owner(struct dma_desc *p)
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{
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return p->des01.rx.own;
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}
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static void ndesc_set_tx_owner(struct dma_desc *p)
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{
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p->des01.tx.own = 1;
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}
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static void ndesc_set_rx_owner(struct dma_desc *p)
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{
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p->des01.rx.own = 1;
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}
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static int ndesc_get_tx_ls(struct dma_desc *p)
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{
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return p->des01.tx.last_segment;
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}
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static void ndesc_release_tx_desc(struct dma_desc *p)
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{
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int ter = p->des01.tx.end_ring;
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memset(p, 0, offsetof(struct dma_desc, des2));
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ndesc_end_tx_desc(p, ter);
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}
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static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
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int csum_flag)
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{
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p->des01.tx.first_segment = is_fs;
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norm_set_tx_desc_len(p, len);
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if (likely(csum_flag))
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p->des01.tx.checksum_insertion = cic_full;
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}
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static void ndesc_clear_tx_ic(struct dma_desc *p)
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{
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p->des01.tx.interrupt = 0;
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}
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static void ndesc_close_tx_desc(struct dma_desc *p)
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{
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p->des01.tx.last_segment = 1;
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p->des01.tx.interrupt = 1;
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}
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static int ndesc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
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{
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/* The type-1 checksum offload engines append the checksum at
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* the end of frame and the two bytes of checksum are added in
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* the length.
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* Adjust for that in the framelen for type-1 checksum offload
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* engines. */
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if (rx_coe_type == STMMAC_RX_COE_TYPE1)
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return p->des01.rx.frame_length - 2;
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else
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return p->des01.rx.frame_length;
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}
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const struct stmmac_desc_ops ndesc_ops = {
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.tx_status = ndesc_get_tx_status,
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.rx_status = ndesc_get_rx_status,
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.get_tx_len = ndesc_get_tx_len,
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.init_rx_desc = ndesc_init_rx_desc,
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.init_tx_desc = ndesc_init_tx_desc,
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.get_tx_owner = ndesc_get_tx_owner,
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.get_rx_owner = ndesc_get_rx_owner,
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.release_tx_desc = ndesc_release_tx_desc,
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.prepare_tx_desc = ndesc_prepare_tx_desc,
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.clear_tx_ic = ndesc_clear_tx_ic,
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.close_tx_desc = ndesc_close_tx_desc,
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.get_tx_ls = ndesc_get_tx_ls,
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.set_tx_owner = ndesc_set_tx_owner,
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.set_rx_owner = ndesc_set_rx_owner,
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.get_rx_frame_len = ndesc_get_rx_frame_len,
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};
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