/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
http://github.com/mirrors/linux · C · 329 lines · 252 code · 54 blank · 23 comment · 41 complexity · 644822d6033cbd44c898f377f868706a MD5 · raw file
- // SPDX-License-Identifier: GPL-2.0-only
- /*******************************************************************************
- This contains the functions to handle the normal descriptors.
- Copyright (C) 2007-2009 STMicroelectronics Ltd
- Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
- *******************************************************************************/
- #include <linux/stmmac.h>
- #include "common.h"
- #include "descs_com.h"
- static int ndesc_get_tx_status(void *data, struct stmmac_extra_stats *x,
- struct dma_desc *p, void __iomem *ioaddr)
- {
- struct net_device_stats *stats = (struct net_device_stats *)data;
- unsigned int tdes0 = le32_to_cpu(p->des0);
- unsigned int tdes1 = le32_to_cpu(p->des1);
- int ret = tx_done;
- /* Get tx owner first */
- if (unlikely(tdes0 & TDES0_OWN))
- return tx_dma_own;
- /* Verify tx error by looking at the last segment. */
- if (likely(!(tdes1 & TDES1_LAST_SEGMENT)))
- return tx_not_ls;
- if (unlikely(tdes0 & TDES0_ERROR_SUMMARY)) {
- if (unlikely(tdes0 & TDES0_UNDERFLOW_ERROR)) {
- x->tx_underflow++;
- stats->tx_fifo_errors++;
- }
- if (unlikely(tdes0 & TDES0_NO_CARRIER)) {
- x->tx_carrier++;
- stats->tx_carrier_errors++;
- }
- if (unlikely(tdes0 & TDES0_LOSS_CARRIER)) {
- x->tx_losscarrier++;
- stats->tx_carrier_errors++;
- }
- if (unlikely((tdes0 & TDES0_EXCESSIVE_DEFERRAL) ||
- (tdes0 & TDES0_EXCESSIVE_COLLISIONS) ||
- (tdes0 & TDES0_LATE_COLLISION))) {
- unsigned int collisions;
- collisions = (tdes0 & TDES0_COLLISION_COUNT_MASK) >> 3;
- stats->collisions += collisions;
- }
- ret = tx_err;
- }
- if (tdes0 & TDES0_VLAN_FRAME)
- x->tx_vlan++;
- if (unlikely(tdes0 & TDES0_DEFERRED))
- x->tx_deferred++;
- return ret;
- }
- static int ndesc_get_tx_len(struct dma_desc *p)
- {
- return (le32_to_cpu(p->des1) & RDES1_BUFFER1_SIZE_MASK);
- }
- /* This function verifies if each incoming frame has some errors
- * and, if required, updates the multicast statistics.
- * In case of success, it returns good_frame because the GMAC device
- * is supposed to be 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 = good_frame;
- unsigned int rdes0 = le32_to_cpu(p->des0);
- struct net_device_stats *stats = (struct net_device_stats *)data;
- if (unlikely(rdes0 & RDES0_OWN))
- return dma_own;
- if (unlikely(!(rdes0 & RDES0_LAST_DESCRIPTOR))) {
- stats->rx_length_errors++;
- return discard_frame;
- }
- if (unlikely(rdes0 & RDES0_ERROR_SUMMARY)) {
- if (unlikely(rdes0 & RDES0_DESCRIPTOR_ERROR))
- x->rx_desc++;
- if (unlikely(rdes0 & RDES0_SA_FILTER_FAIL))
- x->sa_filter_fail++;
- if (unlikely(rdes0 & RDES0_OVERFLOW_ERROR))
- x->overflow_error++;
- if (unlikely(rdes0 & RDES0_IPC_CSUM_ERROR))
- x->ipc_csum_error++;
- if (unlikely(rdes0 & RDES0_COLLISION)) {
- x->rx_collision++;
- stats->collisions++;
- }
- if (unlikely(rdes0 & RDES0_CRC_ERROR)) {
- x->rx_crc_errors++;
- stats->rx_crc_errors++;
- }
- ret = discard_frame;
- }
- if (unlikely(rdes0 & RDES0_DRIBBLING))
- x->dribbling_bit++;
- if (unlikely(rdes0 & RDES0_LENGTH_ERROR)) {
- x->rx_length++;
- ret = discard_frame;
- }
- if (unlikely(rdes0 & RDES0_MII_ERROR)) {
- x->rx_mii++;
- ret = discard_frame;
- }
- #ifdef STMMAC_VLAN_TAG_USED
- if (rdes0 & RDES0_VLAN_TAG)
- x->vlan_tag++;
- #endif
- return ret;
- }
- static void ndesc_init_rx_desc(struct dma_desc *p, int disable_rx_ic, int mode,
- int end, int bfsize)
- {
- int bfsize1;
- p->des0 |= cpu_to_le32(RDES0_OWN);
- bfsize1 = min(bfsize, BUF_SIZE_2KiB - 1);
- p->des1 |= cpu_to_le32(bfsize1 & RDES1_BUFFER1_SIZE_MASK);
- if (mode == STMMAC_CHAIN_MODE)
- ndesc_rx_set_on_chain(p, end);
- else
- ndesc_rx_set_on_ring(p, end, bfsize);
- if (disable_rx_ic)
- p->des1 |= cpu_to_le32(RDES1_DISABLE_IC);
- }
- static void ndesc_init_tx_desc(struct dma_desc *p, int mode, int end)
- {
- p->des0 &= cpu_to_le32(~TDES0_OWN);
- if (mode == STMMAC_CHAIN_MODE)
- ndesc_tx_set_on_chain(p);
- else
- ndesc_end_tx_desc_on_ring(p, end);
- }
- static int ndesc_get_tx_owner(struct dma_desc *p)
- {
- return (le32_to_cpu(p->des0) & TDES0_OWN) >> 31;
- }
- static void ndesc_set_tx_owner(struct dma_desc *p)
- {
- p->des0 |= cpu_to_le32(TDES0_OWN);
- }
- static void ndesc_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
- {
- p->des0 |= cpu_to_le32(RDES0_OWN);
- }
- static int ndesc_get_tx_ls(struct dma_desc *p)
- {
- return (le32_to_cpu(p->des1) & TDES1_LAST_SEGMENT) >> 30;
- }
- static void ndesc_release_tx_desc(struct dma_desc *p, int mode)
- {
- int ter = (le32_to_cpu(p->des1) & TDES1_END_RING) >> 25;
- memset(p, 0, offsetof(struct dma_desc, des2));
- if (mode == STMMAC_CHAIN_MODE)
- ndesc_tx_set_on_chain(p);
- else
- ndesc_end_tx_desc_on_ring(p, ter);
- }
- static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
- bool csum_flag, int mode, bool tx_own,
- bool ls, unsigned int tot_pkt_len)
- {
- unsigned int tdes1 = le32_to_cpu(p->des1);
- if (is_fs)
- tdes1 |= TDES1_FIRST_SEGMENT;
- else
- tdes1 &= ~TDES1_FIRST_SEGMENT;
- if (likely(csum_flag))
- tdes1 |= (TX_CIC_FULL) << TDES1_CHECKSUM_INSERTION_SHIFT;
- else
- tdes1 &= ~(TX_CIC_FULL << TDES1_CHECKSUM_INSERTION_SHIFT);
- if (ls)
- tdes1 |= TDES1_LAST_SEGMENT;
- p->des1 = cpu_to_le32(tdes1);
- if (mode == STMMAC_CHAIN_MODE)
- norm_set_tx_desc_len_on_chain(p, len);
- else
- norm_set_tx_desc_len_on_ring(p, len);
- if (tx_own)
- p->des0 |= cpu_to_le32(TDES0_OWN);
- }
- static void ndesc_set_tx_ic(struct dma_desc *p)
- {
- p->des1 |= cpu_to_le32(TDES1_INTERRUPT);
- }
- static int ndesc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type)
- {
- unsigned int csum = 0;
- /* The type-1 checksum offload engines append the checksum at
- * the end of frame and the two bytes of checksum are added in
- * the length.
- * Adjust for that in the framelen for type-1 checksum offload
- * engines
- */
- if (rx_coe_type == STMMAC_RX_COE_TYPE1)
- csum = 2;
- return (((le32_to_cpu(p->des0) & RDES0_FRAME_LEN_MASK)
- >> RDES0_FRAME_LEN_SHIFT) -
- csum);
- }
- static void ndesc_enable_tx_timestamp(struct dma_desc *p)
- {
- p->des1 |= cpu_to_le32(TDES1_TIME_STAMP_ENABLE);
- }
- static int ndesc_get_tx_timestamp_status(struct dma_desc *p)
- {
- return (le32_to_cpu(p->des0) & TDES0_TIME_STAMP_STATUS) >> 17;
- }
- static void ndesc_get_timestamp(void *desc, u32 ats, u64 *ts)
- {
- struct dma_desc *p = (struct dma_desc *)desc;
- u64 ns;
- ns = le32_to_cpu(p->des2);
- /* convert high/sec time stamp value to nanosecond */
- ns += le32_to_cpu(p->des3) * 1000000000ULL;
- *ts = ns;
- }
- static int ndesc_get_rx_timestamp_status(void *desc, void *next_desc, u32 ats)
- {
- struct dma_desc *p = (struct dma_desc *)desc;
- if ((le32_to_cpu(p->des2) == 0xffffffff) &&
- (le32_to_cpu(p->des3) == 0xffffffff))
- /* timestamp is corrupted, hence don't store it */
- return 0;
- else
- return 1;
- }
- static void ndesc_display_ring(void *head, unsigned int size, bool rx)
- {
- struct dma_desc *p = (struct dma_desc *)head;
- int i;
- pr_info("%s descriptor ring:\n", rx ? "RX" : "TX");
- for (i = 0; i < size; i++) {
- u64 x;
- x = *(u64 *)p;
- pr_info("%03d [0x%x]: 0x%x 0x%x 0x%x 0x%x",
- i, (unsigned int)virt_to_phys(p),
- (unsigned int)x, (unsigned int)(x >> 32),
- p->des2, p->des3);
- p++;
- }
- pr_info("\n");
- }
- static void ndesc_get_addr(struct dma_desc *p, unsigned int *addr)
- {
- *addr = le32_to_cpu(p->des2);
- }
- static void ndesc_set_addr(struct dma_desc *p, dma_addr_t addr)
- {
- p->des2 = cpu_to_le32(addr);
- }
- static void ndesc_clear(struct dma_desc *p)
- {
- p->des2 = 0;
- }
- const 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,
- .release_tx_desc = ndesc_release_tx_desc,
- .prepare_tx_desc = ndesc_prepare_tx_desc,
- .set_tx_ic = ndesc_set_tx_ic,
- .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,
- .enable_tx_timestamp = ndesc_enable_tx_timestamp,
- .get_tx_timestamp_status = ndesc_get_tx_timestamp_status,
- .get_timestamp = ndesc_get_timestamp,
- .get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
- .display_ring = ndesc_display_ring,
- .get_addr = ndesc_get_addr,
- .set_addr = ndesc_set_addr,
- .clear = ndesc_clear,
- };