--- /dev/null
+/*
+ * Copyright (c) 2014 - 2016, The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for
+ * any purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all copies.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/if_vlan.h>
+#include "ess_edma.h"
+#include "edma.h"
+
+extern struct net_device *edma_netdev[EDMA_MAX_PORTID_SUPPORTED];
+bool edma_stp_rstp;
+u16 edma_ath_eth_type;
+
+/* edma_skb_priority_offset()
+ * get edma skb priority
+ */
+static unsigned int edma_skb_priority_offset(struct sk_buff *skb)
+{
+ return (skb->priority >> 2) & 1;
+}
+
+/* edma_alloc_tx_ring()
+ * Allocate Tx descriptors ring
+ */
+static int edma_alloc_tx_ring(struct edma_common_info *edma_cinfo,
+ struct edma_tx_desc_ring *etdr)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+
+ /* Initialize ring */
+ etdr->size = sizeof(struct edma_sw_desc) * etdr->count;
+ etdr->sw_next_to_fill = 0;
+ etdr->sw_next_to_clean = 0;
+
+ /* Allocate SW descriptors */
+ etdr->sw_desc = vzalloc(etdr->size);
+ if (!etdr->sw_desc) {
+ dev_err(&pdev->dev, "buffer alloc of tx ring failed=%p", etdr);
+ return -ENOMEM;
+ }
+
+ /* Allocate HW descriptors */
+ etdr->hw_desc = dma_alloc_coherent(&pdev->dev, etdr->size, &etdr->dma,
+ GFP_KERNEL);
+ if (!etdr->hw_desc) {
+ dev_err(&pdev->dev, "descriptor allocation for tx ring failed");
+ vfree(etdr->sw_desc);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/* edma_free_tx_ring()
+ * Free tx rings allocated by edma_alloc_tx_rings
+ */
+static void edma_free_tx_ring(struct edma_common_info *edma_cinfo,
+ struct edma_tx_desc_ring *etdr)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+
+ if (likely(etdr->dma))
+ dma_free_coherent(&pdev->dev, etdr->size, etdr->hw_desc,
+ etdr->dma);
+
+ vfree(etdr->sw_desc);
+ etdr->sw_desc = NULL;
+}
+
+/* edma_alloc_rx_ring()
+ * allocate rx descriptor ring
+ */
+static int edma_alloc_rx_ring(struct edma_common_info *edma_cinfo,
+ struct edma_rfd_desc_ring *erxd)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+
+ erxd->size = sizeof(struct edma_sw_desc) * erxd->count;
+ erxd->sw_next_to_fill = 0;
+ erxd->sw_next_to_clean = 0;
+
+ /* Allocate SW descriptors */
+ erxd->sw_desc = vzalloc(erxd->size);
+ if (!erxd->sw_desc)
+ return -ENOMEM;
+
+ /* Alloc HW descriptors */
+ erxd->hw_desc = dma_alloc_coherent(&pdev->dev, erxd->size, &erxd->dma,
+ GFP_KERNEL);
+ if (!erxd->hw_desc) {
+ vfree(erxd->sw_desc);
+ return -ENOMEM;
+ }
+
+ /* Initialize pending_fill */
+ erxd->pending_fill = 0;
+
+ return 0;
+}
+
+/* edma_free_rx_ring()
+ * Free rx ring allocated by alloc_rx_ring
+ */
+static void edma_free_rx_ring(struct edma_common_info *edma_cinfo,
+ struct edma_rfd_desc_ring *rxdr)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+
+ if (likely(rxdr->dma))
+ dma_free_coherent(&pdev->dev, rxdr->size, rxdr->hw_desc,
+ rxdr->dma);
+
+ vfree(rxdr->sw_desc);
+ rxdr->sw_desc = NULL;
+}
+
+/* edma_configure_tx()
+ * Configure transmission control data
+ */
+static void edma_configure_tx(struct edma_common_info *edma_cinfo)
+{
+ u32 txq_ctrl_data;
+
+ txq_ctrl_data = (EDMA_TPD_BURST << EDMA_TXQ_NUM_TPD_BURST_SHIFT);
+ txq_ctrl_data |= EDMA_TXQ_CTRL_TPD_BURST_EN;
+ txq_ctrl_data |= (EDMA_TXF_BURST << EDMA_TXQ_TXF_BURST_NUM_SHIFT);
+ edma_write_reg(EDMA_REG_TXQ_CTRL, txq_ctrl_data);
+}
+
+
+/* edma_configure_rx()
+ * configure reception control data
+ */
+static void edma_configure_rx(struct edma_common_info *edma_cinfo)
+{
+ struct edma_hw *hw = &edma_cinfo->hw;
+ u32 rss_type, rx_desc1, rxq_ctrl_data;
+
+ /* Set RSS type */
+ rss_type = hw->rss_type;
+ edma_write_reg(EDMA_REG_RSS_TYPE, rss_type);
+
+ /* Set RFD burst number */
+ rx_desc1 = (EDMA_RFD_BURST << EDMA_RXQ_RFD_BURST_NUM_SHIFT);
+
+ /* Set RFD prefetch threshold */
+ rx_desc1 |= (EDMA_RFD_THR << EDMA_RXQ_RFD_PF_THRESH_SHIFT);
+
+ /* Set RFD in host ring low threshold to generte interrupt */
+ rx_desc1 |= (EDMA_RFD_LTHR << EDMA_RXQ_RFD_LOW_THRESH_SHIFT);
+ edma_write_reg(EDMA_REG_RX_DESC1, rx_desc1);
+
+ /* Set Rx FIFO threshold to start to DMA data to host */
+ rxq_ctrl_data = EDMA_FIFO_THRESH_128_BYTE;
+
+ /* Set RX remove vlan bit */
+ rxq_ctrl_data |= EDMA_RXQ_CTRL_RMV_VLAN;
+
+ edma_write_reg(EDMA_REG_RXQ_CTRL, rxq_ctrl_data);
+}
+
+/* edma_alloc_rx_buf()
+ * does skb allocation for the received packets.
+ */
+static int edma_alloc_rx_buf(struct edma_common_info
+ *edma_cinfo,
+ struct edma_rfd_desc_ring *erdr,
+ int cleaned_count, int queue_id)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+ struct edma_rx_free_desc *rx_desc;
+ struct edma_sw_desc *sw_desc;
+ struct sk_buff *skb;
+ unsigned int i;
+ u16 prod_idx, length;
+ u32 reg_data;
+
+ if (cleaned_count > erdr->count)
+ cleaned_count = erdr->count - 1;
+
+ i = erdr->sw_next_to_fill;
+
+ while (cleaned_count) {
+ sw_desc = &erdr->sw_desc[i];
+ length = edma_cinfo->rx_head_buffer_len;
+
+ if (sw_desc->flags & EDMA_SW_DESC_FLAG_SKB_REUSE) {
+ skb = sw_desc->skb;
+
+ /* Clear REUSE Flag */
+ sw_desc->flags &= ~EDMA_SW_DESC_FLAG_SKB_REUSE;
+ } else {
+ /* alloc skb */
+ skb = netdev_alloc_skb_ip_align(edma_netdev[0], length);
+ if (!skb) {
+ /* Better luck next round */
+ break;
+ }
+ }
+
+ if (edma_cinfo->page_mode) {
+ struct page *pg = alloc_page(GFP_ATOMIC);
+
+ if (!pg) {
+ dev_kfree_skb_any(skb);
+ break;
+ }
+
+ sw_desc->dma = dma_map_page(&pdev->dev, pg, 0,
+ edma_cinfo->rx_page_buffer_len,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(&pdev->dev,
+ sw_desc->dma)) {
+ __free_page(pg);
+ dev_kfree_skb_any(skb);
+ break;
+ }
+
+ skb_fill_page_desc(skb, 0, pg, 0,
+ edma_cinfo->rx_page_buffer_len);
+ sw_desc->flags = EDMA_SW_DESC_FLAG_SKB_FRAG;
+ sw_desc->length = edma_cinfo->rx_page_buffer_len;
+ } else {
+ sw_desc->dma = dma_map_single(&pdev->dev, skb->data,
+ length, DMA_FROM_DEVICE);
+ if (dma_mapping_error(&pdev->dev,
+ sw_desc->dma)) {
+ dev_kfree_skb_any(skb);
+ break;
+ }
+
+ sw_desc->flags = EDMA_SW_DESC_FLAG_SKB_HEAD;
+ sw_desc->length = length;
+ }
+
+ /* Update the buffer info */
+ sw_desc->skb = skb;
+ rx_desc = (&((struct edma_rx_free_desc *)(erdr->hw_desc))[i]);
+ rx_desc->buffer_addr = cpu_to_le64(sw_desc->dma);
+ if (++i == erdr->count)
+ i = 0;
+ cleaned_count--;
+ }
+
+ erdr->sw_next_to_fill = i;
+
+ if (i == 0)
+ prod_idx = erdr->count - 1;
+ else
+ prod_idx = i - 1;
+
+ /* Update the producer index */
+ edma_read_reg(EDMA_REG_RFD_IDX_Q(queue_id), ®_data);
+ reg_data &= ~EDMA_RFD_PROD_IDX_BITS;
+ reg_data |= prod_idx;
+ edma_write_reg(EDMA_REG_RFD_IDX_Q(queue_id), reg_data);
+
+ /* If we couldn't allocate all the buffers
+ * we increment the alloc failure counters
+ */
+ if (cleaned_count)
+ edma_cinfo->edma_ethstats.rx_alloc_fail_ctr++;
+
+ return cleaned_count;
+}
+
+/* edma_init_desc()
+ * update descriptor ring size, buffer and producer/consumer index
+ */
+static void edma_init_desc(struct edma_common_info *edma_cinfo)
+{
+ struct edma_rfd_desc_ring *rfd_ring;
+ struct edma_tx_desc_ring *etdr;
+ int i = 0, j = 0;
+ u32 data = 0;
+ u16 hw_cons_idx = 0;
+
+ /* Set the base address of every TPD ring. */
+ for (i = 0; i < edma_cinfo->num_tx_queues; i++) {
+ etdr = edma_cinfo->tpd_ring[i];
+
+ /* Update descriptor ring base address */
+ edma_write_reg(EDMA_REG_TPD_BASE_ADDR_Q(i), (u32)etdr->dma);
+ edma_read_reg(EDMA_REG_TPD_IDX_Q(i), &data);
+
+ /* Calculate hardware consumer index */
+ hw_cons_idx = (data >> EDMA_TPD_CONS_IDX_SHIFT) & 0xffff;
+ etdr->sw_next_to_fill = hw_cons_idx;
+ etdr->sw_next_to_clean = hw_cons_idx;
+ data &= ~(EDMA_TPD_PROD_IDX_MASK << EDMA_TPD_PROD_IDX_SHIFT);
+ data |= hw_cons_idx;
+
+ /* update producer index */
+ edma_write_reg(EDMA_REG_TPD_IDX_Q(i), data);
+
+ /* update SW consumer index register */
+ edma_write_reg(EDMA_REG_TX_SW_CONS_IDX_Q(i), hw_cons_idx);
+
+ /* Set TPD ring size */
+ edma_write_reg(EDMA_REG_TPD_RING_SIZE,
+ edma_cinfo->tx_ring_count &
+ EDMA_TPD_RING_SIZE_MASK);
+ }
+
+ for (i = 0, j = 0; i < edma_cinfo->num_rx_queues; i++) {
+ rfd_ring = edma_cinfo->rfd_ring[j];
+ /* Update Receive Free descriptor ring base address */
+ edma_write_reg(EDMA_REG_RFD_BASE_ADDR_Q(j),
+ (u32)(rfd_ring->dma));
+ j += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+ }
+
+ data = edma_cinfo->rx_head_buffer_len;
+ if (edma_cinfo->page_mode)
+ data = edma_cinfo->rx_page_buffer_len;
+
+ data &= EDMA_RX_BUF_SIZE_MASK;
+ data <<= EDMA_RX_BUF_SIZE_SHIFT;
+
+ /* Update RFD ring size and RX buffer size */
+ data |= (edma_cinfo->rx_ring_count & EDMA_RFD_RING_SIZE_MASK)
+ << EDMA_RFD_RING_SIZE_SHIFT;
+
+ edma_write_reg(EDMA_REG_RX_DESC0, data);
+
+ /* Disable TX FIFO low watermark and high watermark */
+ edma_write_reg(EDMA_REG_TXF_WATER_MARK, 0);
+
+ /* Load all of base address above */
+ edma_read_reg(EDMA_REG_TX_SRAM_PART, &data);
+ data |= 1 << EDMA_LOAD_PTR_SHIFT;
+ edma_write_reg(EDMA_REG_TX_SRAM_PART, data);
+}
+
+/* edma_receive_checksum
+ * Api to check checksum on receive packets
+ */
+static void edma_receive_checksum(struct edma_rx_return_desc *rd,
+ struct sk_buff *skb)
+{
+ skb_checksum_none_assert(skb);
+
+ /* check the RRD IP/L4 checksum bit to see if
+ * its set, which in turn indicates checksum
+ * failure.
+ */
+ if (rd->rrd6 & EDMA_RRD_CSUM_FAIL_MASK)
+ return;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+}
+
+/* edma_clean_rfd()
+ * clean up rx resourcers on error
+ */
+static void edma_clean_rfd(struct edma_rfd_desc_ring *erdr, u16 index)
+{
+ struct edma_rx_free_desc *rx_desc;
+ struct edma_sw_desc *sw_desc;
+
+ rx_desc = (&((struct edma_rx_free_desc *)(erdr->hw_desc))[index]);
+ sw_desc = &erdr->sw_desc[index];
+ if (sw_desc->skb) {
+ dev_kfree_skb_any(sw_desc->skb);
+ sw_desc->skb = NULL;
+ }
+
+ memset(rx_desc, 0, sizeof(struct edma_rx_free_desc));
+}
+
+/* edma_rx_complete_fraglist()
+ * Complete Rx processing for fraglist skbs
+ */
+static void edma_rx_complete_stp_rstp(struct sk_buff *skb, int port_id, struct edma_rx_return_desc *rd)
+{
+ int i;
+ u32 priority;
+ u16 port_type;
+ u8 mac_addr[EDMA_ETH_HDR_LEN];
+
+ port_type = (rd->rrd1 >> EDMA_RRD_PORT_TYPE_SHIFT)
+ & EDMA_RRD_PORT_TYPE_MASK;
+ /* if port type is 0x4, then only proceed with
+ * other stp/rstp calculation
+ */
+ if (port_type == EDMA_RX_ATH_HDR_RSTP_PORT_TYPE) {
+ u8 bpdu_mac[6] = {0x01, 0x80, 0xc2, 0x00, 0x00, 0x00};
+
+ /* calculate the frame priority */
+ priority = (rd->rrd1 >> EDMA_RRD_PRIORITY_SHIFT)
+ & EDMA_RRD_PRIORITY_MASK;
+
+ for (i = 0; i < EDMA_ETH_HDR_LEN; i++)
+ mac_addr[i] = skb->data[i];
+
+ /* Check if destination mac addr is bpdu addr */
+ if (!memcmp(mac_addr, bpdu_mac, 6)) {
+ /* destination mac address is BPDU
+ * destination mac address, then add
+ * atheros header to the packet.
+ */
+ u16 athr_hdr = (EDMA_RX_ATH_HDR_VERSION << EDMA_RX_ATH_HDR_VERSION_SHIFT) |
+ (priority << EDMA_RX_ATH_HDR_PRIORITY_SHIFT) |
+ (EDMA_RX_ATH_HDR_RSTP_PORT_TYPE << EDMA_RX_ATH_PORT_TYPE_SHIFT) | port_id;
+ skb_push(skb, 4);
+ memcpy(skb->data, mac_addr, EDMA_ETH_HDR_LEN);
+ *(uint16_t *)&skb->data[12] = htons(edma_ath_eth_type);
+ *(uint16_t *)&skb->data[14] = htons(athr_hdr);
+ }
+ }
+}
+
+/*
+ * edma_rx_complete_fraglist()
+ * Complete Rx processing for fraglist skbs
+ */
+static int edma_rx_complete_fraglist(struct sk_buff *skb, u16 num_rfds, u16 length, u32 sw_next_to_clean,
+ u16 *cleaned_count, struct edma_rfd_desc_ring *erdr, struct edma_common_info *edma_cinfo)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+ struct edma_hw *hw = &edma_cinfo->hw;
+ struct sk_buff *skb_temp;
+ struct edma_sw_desc *sw_desc;
+ int i;
+ u16 size_remaining;
+
+ skb->data_len = 0;
+ skb->tail += (hw->rx_head_buff_size - 16);
+ skb->len = skb->truesize = length;
+ size_remaining = length - (hw->rx_head_buff_size - 16);
+
+ /* clean-up all related sw_descs */
+ for (i = 1; i < num_rfds; i++) {
+ struct sk_buff *skb_prev;
+ sw_desc = &erdr->sw_desc[sw_next_to_clean];
+ skb_temp = sw_desc->skb;
+
+ dma_unmap_single(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_FROM_DEVICE);
+
+ if (size_remaining < hw->rx_head_buff_size)
+ skb_put(skb_temp, size_remaining);
+ else
+ skb_put(skb_temp, hw->rx_head_buff_size);
+
+ /*
+ * If we are processing the first rfd, we link
+ * skb->frag_list to the skb corresponding to the
+ * first RFD
+ */
+ if (i == 1)
+ skb_shinfo(skb)->frag_list = skb_temp;
+ else
+ skb_prev->next = skb_temp;
+ skb_prev = skb_temp;
+ skb_temp->next = NULL;
+
+ skb->data_len += skb_temp->len;
+ size_remaining -= skb_temp->len;
+
+ /* Increment SW index */
+ sw_next_to_clean = (sw_next_to_clean + 1) & (erdr->count - 1);
+ (*cleaned_count)++;
+ }
+
+ return sw_next_to_clean;
+}
+
+/* edma_rx_complete_paged()
+ * Complete Rx processing for paged skbs
+ */
+static int edma_rx_complete_paged(struct sk_buff *skb, u16 num_rfds, u16 length, u32 sw_next_to_clean,
+ u16 *cleaned_count, struct edma_rfd_desc_ring *erdr, struct edma_common_info *edma_cinfo)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+ struct sk_buff *skb_temp;
+ struct edma_sw_desc *sw_desc;
+ int i;
+ u16 size_remaining;
+
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
+
+ /* Setup skbuff fields */
+ skb->len = length;
+
+ if (likely(num_rfds <= 1)) {
+ skb->data_len = length;
+ skb->truesize += edma_cinfo->rx_page_buffer_len;
+ skb_fill_page_desc(skb, 0, skb_frag_page(frag),
+ 16, length);
+ } else {
+ skb_frag_size_sub(frag, 16);
+ skb->data_len = skb_frag_size(frag);
+ skb->truesize += edma_cinfo->rx_page_buffer_len;
+ size_remaining = length - skb_frag_size(frag);
+
+ skb_fill_page_desc(skb, 0, skb_frag_page(frag),
+ 16, skb_frag_size(frag));
+
+ /* clean-up all related sw_descs */
+ for (i = 1; i < num_rfds; i++) {
+ sw_desc = &erdr->sw_desc[sw_next_to_clean];
+ skb_temp = sw_desc->skb;
+ frag = &skb_shinfo(skb_temp)->frags[0];
+ dma_unmap_page(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_FROM_DEVICE);
+
+ if (size_remaining < edma_cinfo->rx_page_buffer_len)
+ skb_frag_size_set(frag, size_remaining);
+
+ skb_fill_page_desc(skb, i, skb_frag_page(frag),
+ 0, skb_frag_size(frag));
+
+ skb_shinfo(skb_temp)->nr_frags = 0;
+ dev_kfree_skb_any(skb_temp);
+
+ skb->data_len += skb_frag_size(frag);
+ skb->truesize += edma_cinfo->rx_page_buffer_len;
+ size_remaining -= skb_frag_size(frag);
+
+ /* Increment SW index */
+ sw_next_to_clean = (sw_next_to_clean + 1) & (erdr->count - 1);
+ (*cleaned_count)++;
+ }
+ }
+
+ return sw_next_to_clean;
+}
+
+/*
+ * edma_rx_complete()
+ * Main api called from the poll function to process rx packets.
+ */
+static u16 edma_rx_complete(struct edma_common_info *edma_cinfo,
+ int *work_done, int work_to_do, int queue_id,
+ struct napi_struct *napi)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+ struct edma_rfd_desc_ring *erdr = edma_cinfo->rfd_ring[queue_id];
+ struct net_device *netdev;
+ struct edma_adapter *adapter;
+ struct edma_sw_desc *sw_desc;
+ struct sk_buff *skb;
+ struct edma_rx_return_desc *rd;
+ u16 hash_type, rrd[8], cleaned_count = 0, length = 0, num_rfds = 1,
+ sw_next_to_clean, hw_next_to_clean = 0, vlan = 0, ret_count = 0;
+ u32 data = 0;
+ u8 *vaddr;
+ int port_id, i, drop_count = 0;
+ u32 priority;
+ u16 count = erdr->count, rfd_avail;
+ u8 queue_to_rxid[8] = {0, 0, 1, 1, 2, 2, 3, 3};
+
+ cleaned_count = erdr->pending_fill;
+ sw_next_to_clean = erdr->sw_next_to_clean;
+
+ edma_read_reg(EDMA_REG_RFD_IDX_Q(queue_id), &data);
+ hw_next_to_clean = (data >> EDMA_RFD_CONS_IDX_SHIFT) &
+ EDMA_RFD_CONS_IDX_MASK;
+
+ do {
+ while (sw_next_to_clean != hw_next_to_clean) {
+ if (!work_to_do)
+ break;
+
+ sw_desc = &erdr->sw_desc[sw_next_to_clean];
+ skb = sw_desc->skb;
+
+ /* Unmap the allocated buffer */
+ if (likely(sw_desc->flags & EDMA_SW_DESC_FLAG_SKB_HEAD))
+ dma_unmap_single(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_FROM_DEVICE);
+ else
+ dma_unmap_page(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_FROM_DEVICE);
+
+ /* Get RRD */
+ if (edma_cinfo->page_mode) {
+ vaddr = kmap_atomic(skb_frag_page(&skb_shinfo(skb)->frags[0]));
+ memcpy((uint8_t *)&rrd[0], vaddr, 16);
+ rd = (struct edma_rx_return_desc *)rrd;
+ kunmap_atomic(vaddr);
+ } else {
+ rd = (struct edma_rx_return_desc *)skb->data;
+ }
+
+ /* Check if RRD is valid */
+ if (!(rd->rrd7 & EDMA_RRD_DESC_VALID)) {
+ edma_clean_rfd(erdr, sw_next_to_clean);
+ sw_next_to_clean = (sw_next_to_clean + 1) &
+ (erdr->count - 1);
+ cleaned_count++;
+ continue;
+ }
+
+ /* Get the number of RFDs from RRD */
+ num_rfds = rd->rrd1 & EDMA_RRD_NUM_RFD_MASK;
+
+ /* Get Rx port ID from switch */
+ port_id = (rd->rrd1 >> EDMA_PORT_ID_SHIFT) & EDMA_PORT_ID_MASK;
+ if ((!port_id) || (port_id > EDMA_MAX_PORTID_SUPPORTED)) {
+ dev_err(&pdev->dev, "Invalid RRD source port bit set");
+ for (i = 0; i < num_rfds; i++) {
+ edma_clean_rfd(erdr, sw_next_to_clean);
+ sw_next_to_clean = (sw_next_to_clean + 1) & (erdr->count - 1);
+ cleaned_count++;
+ }
+ continue;
+ }
+
+ /* check if we have a sink for the data we receive.
+ * If the interface isn't setup, we have to drop the
+ * incoming data for now.
+ */
+ netdev = edma_cinfo->portid_netdev_lookup_tbl[port_id];
+ if (!netdev) {
+ edma_clean_rfd(erdr, sw_next_to_clean);
+ sw_next_to_clean = (sw_next_to_clean + 1) &
+ (erdr->count - 1);
+ cleaned_count++;
+ continue;
+ }
+ adapter = netdev_priv(netdev);
+
+ /* This code is added to handle a usecase where high
+ * priority stream and a low priority stream are
+ * received simultaneously on DUT. The problem occurs
+ * if one of the Rx rings is full and the corresponding
+ * core is busy with other stuff. This causes ESS CPU
+ * port to backpressure all incoming traffic including
+ * high priority one. We monitor free descriptor count
+ * on each CPU and whenever it reaches threshold (< 80),
+ * we drop all low priority traffic and let only high
+ * priotiy traffic pass through. We can hence avoid
+ * ESS CPU port to send backpressure on high priroity
+ * stream.
+ */
+ priority = (rd->rrd1 >> EDMA_RRD_PRIORITY_SHIFT)
+ & EDMA_RRD_PRIORITY_MASK;
+ if (likely(!priority && !edma_cinfo->page_mode && (num_rfds <= 1))) {
+ rfd_avail = (count + sw_next_to_clean - hw_next_to_clean - 1) & (count - 1);
+ if (rfd_avail < EDMA_RFD_AVAIL_THR) {
+ sw_desc->flags = EDMA_SW_DESC_FLAG_SKB_REUSE;
+ sw_next_to_clean = (sw_next_to_clean + 1) & (erdr->count - 1);
+ adapter->stats.rx_dropped++;
+ cleaned_count++;
+ drop_count++;
+ if (drop_count == 3) {
+ work_to_do--;
+ (*work_done)++;
+ drop_count = 0;
+ }
+ if (cleaned_count >= EDMA_RX_BUFFER_WRITE) {
+ /* If buffer clean count reaches 16, we replenish HW buffers. */
+ ret_count = edma_alloc_rx_buf(edma_cinfo, erdr, cleaned_count, queue_id);
+ edma_write_reg(EDMA_REG_RX_SW_CONS_IDX_Q(queue_id),
+ sw_next_to_clean);
+ cleaned_count = ret_count;
+ erdr->pending_fill = ret_count;
+ }
+ continue;
+ }
+ }
+
+ work_to_do--;
+ (*work_done)++;
+
+ /* Increment SW index */
+ sw_next_to_clean = (sw_next_to_clean + 1) &
+ (erdr->count - 1);
+
+ cleaned_count++;
+
+ /* Get the packet size and allocate buffer */
+ length = rd->rrd6 & EDMA_RRD_PKT_SIZE_MASK;
+
+ if (edma_cinfo->page_mode) {
+ /* paged skb */
+ sw_next_to_clean = edma_rx_complete_paged(skb, num_rfds, length, sw_next_to_clean, &cleaned_count, erdr, edma_cinfo);
+ if (!pskb_may_pull(skb, ETH_HLEN)) {
+ dev_kfree_skb_any(skb);
+ continue;
+ }
+ } else {
+ /* single or fraglist skb */
+
+ /* Addition of 16 bytes is required, as in the packet
+ * first 16 bytes are rrd descriptors, so actual data
+ * starts from an offset of 16.
+ */
+ skb_reserve(skb, 16);
+ if (likely((num_rfds <= 1) || !edma_cinfo->fraglist_mode)) {
+ skb_put(skb, length);
+ } else {
+ sw_next_to_clean = edma_rx_complete_fraglist(skb, num_rfds, length, sw_next_to_clean, &cleaned_count, erdr, edma_cinfo);
+ }
+ }
+
+ if (edma_stp_rstp) {
+ edma_rx_complete_stp_rstp(skb, port_id, rd);
+ }
+
+ skb->protocol = eth_type_trans(skb, netdev);
+
+ /* Record Rx queue for RFS/RPS and fill flow hash from HW */
+ skb_record_rx_queue(skb, queue_to_rxid[queue_id]);
+ if (netdev->features & NETIF_F_RXHASH) {
+ hash_type = (rd->rrd5 >> EDMA_HASH_TYPE_SHIFT);
+ if ((hash_type > EDMA_HASH_TYPE_START) && (hash_type < EDMA_HASH_TYPE_END))
+ skb_set_hash(skb, rd->rrd2, PKT_HASH_TYPE_L4);
+ }
+
+#ifdef CONFIG_NF_FLOW_COOKIE
+ skb->flow_cookie = rd->rrd3 & EDMA_RRD_FLOW_COOKIE_MASK;
+#endif
+ edma_receive_checksum(rd, skb);
+
+ /* Process VLAN HW acceleration indication provided by HW */
+ if (unlikely(adapter->default_vlan_tag != rd->rrd4)) {
+ vlan = rd->rrd4;
+ if (likely(rd->rrd7 & EDMA_RRD_CVLAN))
+ __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
+ else if (rd->rrd1 & EDMA_RRD_SVLAN)
+ __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), vlan);
+ }
+
+ /* Update rx statistics */
+ adapter->stats.rx_packets++;
+ adapter->stats.rx_bytes += length;
+
+ /* Check if we reached refill threshold */
+ if (cleaned_count >= EDMA_RX_BUFFER_WRITE) {
+ ret_count = edma_alloc_rx_buf(edma_cinfo, erdr, cleaned_count, queue_id);
+ edma_write_reg(EDMA_REG_RX_SW_CONS_IDX_Q(queue_id),
+ sw_next_to_clean);
+ cleaned_count = ret_count;
+ erdr->pending_fill = ret_count;
+ }
+
+ /* At this point skb should go to stack */
+ napi_gro_receive(napi, skb);
+ }
+
+ /* Check if we still have NAPI budget */
+ if (!work_to_do)
+ break;
+
+ /* Read index once again since we still have NAPI budget */
+ edma_read_reg(EDMA_REG_RFD_IDX_Q(queue_id), &data);
+ hw_next_to_clean = (data >> EDMA_RFD_CONS_IDX_SHIFT) &
+ EDMA_RFD_CONS_IDX_MASK;
+ } while (hw_next_to_clean != sw_next_to_clean);
+
+ erdr->sw_next_to_clean = sw_next_to_clean;
+
+ /* Refill here in case refill threshold wasn't reached */
+ if (likely(cleaned_count)) {
+ ret_count = edma_alloc_rx_buf(edma_cinfo, erdr, cleaned_count, queue_id);
+ erdr->pending_fill = ret_count;
+ if (ret_count) {
+ if (net_ratelimit())
+ dev_dbg(&pdev->dev, "Not all buffers was reallocated");
+ }
+
+ edma_write_reg(EDMA_REG_RX_SW_CONS_IDX_Q(queue_id),
+ erdr->sw_next_to_clean);
+ }
+
+ return erdr->pending_fill;
+}
+
+/* edma_delete_rfs_filter()
+ * Remove RFS filter from switch
+ */
+static int edma_delete_rfs_filter(struct edma_adapter *adapter,
+ struct edma_rfs_filter_node *filter_node)
+{
+ int res = -1;
+
+ struct flow_keys *keys = &filter_node->keys;
+
+ if (likely(adapter->set_rfs_rule))
+ res = (*adapter->set_rfs_rule)(adapter->netdev,
+ flow_get_u32_src(keys), flow_get_u32_dst(keys),
+ keys->ports.src, keys->ports.dst,
+ keys->basic.ip_proto, filter_node->rq_id, 0);
+
+ return res;
+}
+
+/* edma_add_rfs_filter()
+ * Add RFS filter to switch
+ */
+static int edma_add_rfs_filter(struct edma_adapter *adapter,
+ struct flow_keys *keys, u16 rq,
+ struct edma_rfs_filter_node *filter_node)
+{
+ int res = -1;
+
+ struct flow_keys *dest_keys = &filter_node->keys;
+
+ memcpy(dest_keys, &filter_node->keys, sizeof(*dest_keys));
+/*
+ dest_keys->control = keys->control;
+ dest_keys->basic = keys->basic;
+ dest_keys->addrs = keys->addrs;
+ dest_keys->ports = keys->ports;
+ dest_keys.ip_proto = keys->ip_proto;
+*/
+ /* Call callback registered by ESS driver */
+ if (likely(adapter->set_rfs_rule))
+ res = (*adapter->set_rfs_rule)(adapter->netdev, flow_get_u32_src(keys),
+ flow_get_u32_dst(keys), keys->ports.src, keys->ports.dst,
+ keys->basic.ip_proto, rq, 1);
+
+ return res;
+}
+
+/* edma_rfs_key_search()
+ * Look for existing RFS entry
+ */
+static struct edma_rfs_filter_node *edma_rfs_key_search(struct hlist_head *h,
+ struct flow_keys *key)
+{
+ struct edma_rfs_filter_node *p;
+
+ hlist_for_each_entry(p, h, node)
+ if (flow_get_u32_src(&p->keys) == flow_get_u32_src(key) &&
+ flow_get_u32_dst(&p->keys) == flow_get_u32_dst(key) &&
+ p->keys.ports.src == key->ports.src &&
+ p->keys.ports.dst == key->ports.dst &&
+ p->keys.basic.ip_proto == key->basic.ip_proto)
+ return p;
+ return NULL;
+}
+
+/* edma_initialise_rfs_flow_table()
+ * Initialise EDMA RFS flow table
+ */
+static void edma_initialise_rfs_flow_table(struct edma_adapter *adapter)
+{
+ int i;
+
+ spin_lock_init(&adapter->rfs.rfs_ftab_lock);
+
+ /* Initialize EDMA flow hash table */
+ for (i = 0; i < EDMA_RFS_FLOW_ENTRIES; i++)
+ INIT_HLIST_HEAD(&adapter->rfs.hlist_head[i]);
+
+ adapter->rfs.max_num_filter = EDMA_RFS_FLOW_ENTRIES;
+ adapter->rfs.filter_available = adapter->rfs.max_num_filter;
+ adapter->rfs.hashtoclean = 0;
+
+ /* Add timer to get periodic RFS updates from OS */
+ timer_setup(&adapter->rfs.expire_rfs, edma_flow_may_expire, 0);
+ mod_timer(&adapter->rfs.expire_rfs, jiffies + HZ / 4);
+}
+
+/* edma_free_rfs_flow_table()
+ * Free EDMA RFS flow table
+ */
+static void edma_free_rfs_flow_table(struct edma_adapter *adapter)
+{
+ int i;
+
+ /* Remove sync timer */
+ del_timer_sync(&adapter->rfs.expire_rfs);
+ spin_lock_bh(&adapter->rfs.rfs_ftab_lock);
+
+ /* Free EDMA RFS table entries */
+ adapter->rfs.filter_available = 0;
+
+ /* Clean-up EDMA flow hash table */
+ for (i = 0; i < EDMA_RFS_FLOW_ENTRIES; i++) {
+ struct hlist_head *hhead;
+ struct hlist_node *tmp;
+ struct edma_rfs_filter_node *filter_node;
+ int res;
+
+ hhead = &adapter->rfs.hlist_head[i];
+ hlist_for_each_entry_safe(filter_node, tmp, hhead, node) {
+ res = edma_delete_rfs_filter(adapter, filter_node);
+ if (res < 0)
+ dev_warn(&adapter->netdev->dev,
+ "EDMA going down but RFS entry %d not allowed to be flushed by Switch",
+ filter_node->flow_id);
+ hlist_del(&filter_node->node);
+ kfree(filter_node);
+ }
+ }
+ spin_unlock_bh(&adapter->rfs.rfs_ftab_lock);
+}
+
+/* edma_tx_unmap_and_free()
+ * clean TX buffer
+ */
+static inline void edma_tx_unmap_and_free(struct platform_device *pdev,
+ struct edma_sw_desc *sw_desc)
+{
+ struct sk_buff *skb = sw_desc->skb;
+
+ if (likely((sw_desc->flags & EDMA_SW_DESC_FLAG_SKB_HEAD) ||
+ (sw_desc->flags & EDMA_SW_DESC_FLAG_SKB_FRAGLIST)))
+ /* unmap_single for skb head area */
+ dma_unmap_single(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_TO_DEVICE);
+ else if (sw_desc->flags & EDMA_SW_DESC_FLAG_SKB_FRAG)
+ /* unmap page for paged fragments */
+ dma_unmap_page(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_TO_DEVICE);
+
+ if (likely(sw_desc->flags & EDMA_SW_DESC_FLAG_LAST))
+ dev_kfree_skb_any(skb);
+
+ sw_desc->flags = 0;
+}
+
+/* edma_tx_complete()
+ * Used to clean tx queues and update hardware and consumer index
+ */
+static void edma_tx_complete(struct edma_common_info *edma_cinfo, int queue_id)
+{
+ struct edma_tx_desc_ring *etdr = edma_cinfo->tpd_ring[queue_id];
+ struct edma_sw_desc *sw_desc;
+ struct platform_device *pdev = edma_cinfo->pdev;
+ int i;
+
+ u16 sw_next_to_clean = etdr->sw_next_to_clean;
+ u16 hw_next_to_clean;
+ u32 data = 0;
+
+ edma_read_reg(EDMA_REG_TPD_IDX_Q(queue_id), &data);
+ hw_next_to_clean = (data >> EDMA_TPD_CONS_IDX_SHIFT) & EDMA_TPD_CONS_IDX_MASK;
+
+ /* clean the buffer here */
+ while (sw_next_to_clean != hw_next_to_clean) {
+ sw_desc = &etdr->sw_desc[sw_next_to_clean];
+ edma_tx_unmap_and_free(pdev, sw_desc);
+ sw_next_to_clean = (sw_next_to_clean + 1) & (etdr->count - 1);
+ }
+
+ etdr->sw_next_to_clean = sw_next_to_clean;
+
+ /* update the TPD consumer index register */
+ edma_write_reg(EDMA_REG_TX_SW_CONS_IDX_Q(queue_id), sw_next_to_clean);
+
+ /* Wake the queue if queue is stopped and netdev link is up */
+ for (i = 0; i < EDMA_MAX_NETDEV_PER_QUEUE && etdr->nq[i] ; i++) {
+ if (netif_tx_queue_stopped(etdr->nq[i])) {
+ if ((etdr->netdev[i]) && netif_carrier_ok(etdr->netdev[i]))
+ netif_tx_wake_queue(etdr->nq[i]);
+ }
+ }
+}
+
+/* edma_get_tx_buffer()
+ * Get sw_desc corresponding to the TPD
+ */
+static struct edma_sw_desc *edma_get_tx_buffer(struct edma_common_info *edma_cinfo,
+ struct edma_tx_desc *tpd, int queue_id)
+{
+ struct edma_tx_desc_ring *etdr = edma_cinfo->tpd_ring[queue_id];
+ return &etdr->sw_desc[tpd - (struct edma_tx_desc *)etdr->hw_desc];
+}
+
+/* edma_get_next_tpd()
+ * Return a TPD descriptor for transfer
+ */
+static struct edma_tx_desc *edma_get_next_tpd(struct edma_common_info *edma_cinfo,
+ int queue_id)
+{
+ struct edma_tx_desc_ring *etdr = edma_cinfo->tpd_ring[queue_id];
+ u16 sw_next_to_fill = etdr->sw_next_to_fill;
+ struct edma_tx_desc *tpd_desc =
+ (&((struct edma_tx_desc *)(etdr->hw_desc))[sw_next_to_fill]);
+
+ etdr->sw_next_to_fill = (etdr->sw_next_to_fill + 1) & (etdr->count - 1);
+
+ return tpd_desc;
+}
+
+/* edma_tpd_available()
+ * Check number of free TPDs
+ */
+static inline u16 edma_tpd_available(struct edma_common_info *edma_cinfo,
+ int queue_id)
+{
+ struct edma_tx_desc_ring *etdr = edma_cinfo->tpd_ring[queue_id];
+
+ u16 sw_next_to_fill;
+ u16 sw_next_to_clean;
+ u16 count = 0;
+
+ sw_next_to_clean = etdr->sw_next_to_clean;
+ sw_next_to_fill = etdr->sw_next_to_fill;
+
+ if (likely(sw_next_to_clean <= sw_next_to_fill))
+ count = etdr->count;
+
+ return count + sw_next_to_clean - sw_next_to_fill - 1;
+}
+
+/* edma_tx_queue_get()
+ * Get the starting number of the queue
+ */
+static inline int edma_tx_queue_get(struct edma_adapter *adapter,
+ struct sk_buff *skb, int txq_id)
+{
+ /* skb->priority is used as an index to skb priority table
+ * and based on packet priority, correspong queue is assigned.
+ */
+ return adapter->tx_start_offset[txq_id] + edma_skb_priority_offset(skb);
+}
+
+/* edma_tx_update_hw_idx()
+ * update the producer index for the ring transmitted
+ */
+static void edma_tx_update_hw_idx(struct edma_common_info *edma_cinfo,
+ struct sk_buff *skb, int queue_id)
+{
+ struct edma_tx_desc_ring *etdr = edma_cinfo->tpd_ring[queue_id];
+ u32 tpd_idx_data;
+
+ /* Read and update the producer index */
+ edma_read_reg(EDMA_REG_TPD_IDX_Q(queue_id), &tpd_idx_data);
+ tpd_idx_data &= ~EDMA_TPD_PROD_IDX_BITS;
+ tpd_idx_data |= (etdr->sw_next_to_fill & EDMA_TPD_PROD_IDX_MASK)
+ << EDMA_TPD_PROD_IDX_SHIFT;
+
+ edma_write_reg(EDMA_REG_TPD_IDX_Q(queue_id), tpd_idx_data);
+}
+
+/* edma_rollback_tx()
+ * Function to retrieve tx resources in case of error
+ */
+static void edma_rollback_tx(struct edma_adapter *adapter,
+ struct edma_tx_desc *start_tpd, int queue_id)
+{
+ struct edma_tx_desc_ring *etdr = adapter->edma_cinfo->tpd_ring[queue_id];
+ struct edma_sw_desc *sw_desc;
+ struct edma_tx_desc *tpd = NULL;
+ u16 start_index, index;
+
+ start_index = start_tpd - (struct edma_tx_desc *)(etdr->hw_desc);
+
+ index = start_index;
+ while (index != etdr->sw_next_to_fill) {
+ tpd = (&((struct edma_tx_desc *)(etdr->hw_desc))[index]);
+ sw_desc = &etdr->sw_desc[index];
+ edma_tx_unmap_and_free(adapter->pdev, sw_desc);
+ memset(tpd, 0, sizeof(struct edma_tx_desc));
+ if (++index == etdr->count)
+ index = 0;
+ }
+ etdr->sw_next_to_fill = start_index;
+}
+
+/* edma_tx_map_and_fill()
+ * gets called from edma_xmit_frame
+ *
+ * This is where the dma of the buffer to be transmitted
+ * gets mapped
+ */
+static int edma_tx_map_and_fill(struct edma_common_info *edma_cinfo,
+ struct edma_adapter *adapter, struct sk_buff *skb, int queue_id,
+ unsigned int flags_transmit, u16 from_cpu, u16 dp_bitmap,
+ bool packet_is_rstp, int nr_frags)
+{
+ struct edma_sw_desc *sw_desc = NULL;
+ struct platform_device *pdev = edma_cinfo->pdev;
+ struct edma_tx_desc *tpd = NULL, *start_tpd = NULL;
+ struct sk_buff *iter_skb;
+ int i = 0;
+ u32 word1 = 0, word3 = 0, lso_word1 = 0, svlan_tag = 0;
+ u16 buf_len, lso_desc_len = 0;
+
+ /* It should either be a nr_frags skb or fraglist skb but not both */
+ BUG_ON(nr_frags && skb_has_frag_list(skb));
+
+ if (skb_is_gso(skb)) {
+ /* TODO: What additional checks need to be performed here */
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
+ lso_word1 |= EDMA_TPD_IPV4_EN;
+ ip_hdr(skb)->check = 0;
+ tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
+ } else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
+ lso_word1 |= EDMA_TPD_LSO_V2_EN;
+ ipv6_hdr(skb)->payload_len = 0;
+ tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
+ } else
+ return -EINVAL;
+
+ lso_word1 |= EDMA_TPD_LSO_EN | ((skb_shinfo(skb)->gso_size & EDMA_TPD_MSS_MASK) << EDMA_TPD_MSS_SHIFT) |
+ (skb_transport_offset(skb) << EDMA_TPD_HDR_SHIFT);
+ } else if (flags_transmit & EDMA_HW_CHECKSUM) {
+ u8 css, cso;
+ cso = skb_checksum_start_offset(skb);
+ css = cso + skb->csum_offset;
+
+ word1 |= (EDMA_TPD_CUSTOM_CSUM_EN);
+ word1 |= (cso >> 1) << EDMA_TPD_HDR_SHIFT;
+ word1 |= ((css >> 1) << EDMA_TPD_CUSTOM_CSUM_SHIFT);
+ }
+
+ if (skb->protocol == htons(ETH_P_PPP_SES))
+ word1 |= EDMA_TPD_PPPOE_EN;
+
+ if (flags_transmit & EDMA_VLAN_TX_TAG_INSERT_FLAG) {
+ switch(skb->vlan_proto) {
+ case htons(ETH_P_8021Q):
+ word3 |= (1 << EDMA_TX_INS_CVLAN);
+ word3 |= skb_vlan_tag_get(skb) << EDMA_TX_CVLAN_TAG_SHIFT;
+ break;
+ case htons(ETH_P_8021AD):
+ word1 |= (1 << EDMA_TX_INS_SVLAN);
+ svlan_tag = skb_vlan_tag_get(skb) << EDMA_TX_SVLAN_TAG_SHIFT;
+ break;
+ default:
+ dev_err(&pdev->dev, "no ctag or stag present\n");
+ goto vlan_tag_error;
+ }
+ } else if (flags_transmit & EDMA_VLAN_TX_TAG_INSERT_DEFAULT_FLAG) {
+ word3 |= (1 << EDMA_TX_INS_CVLAN);
+ word3 |= (adapter->default_vlan_tag) << EDMA_TX_CVLAN_TAG_SHIFT;
+ }
+
+ if (packet_is_rstp) {
+ word3 |= dp_bitmap << EDMA_TPD_PORT_BITMAP_SHIFT;
+ word3 |= from_cpu << EDMA_TPD_FROM_CPU_SHIFT;
+ } else {
+ word3 |= adapter->dp_bitmap << EDMA_TPD_PORT_BITMAP_SHIFT;
+ }
+
+ buf_len = skb_headlen(skb);
+
+ if (lso_word1) {
+ if (lso_word1 & EDMA_TPD_LSO_V2_EN) {
+
+ /* IPv6 LSOv2 descriptor */
+ start_tpd = tpd = edma_get_next_tpd(edma_cinfo, queue_id);
+ sw_desc = edma_get_tx_buffer(edma_cinfo, tpd, queue_id);
+ sw_desc->flags |= EDMA_SW_DESC_FLAG_SKB_NONE;
+
+ /* LSOv2 descriptor overrides addr field to pass length */
+ tpd->addr = cpu_to_le16(skb->len);
+ tpd->svlan_tag = svlan_tag;
+ tpd->word1 = word1 | lso_word1;
+ tpd->word3 = word3;
+ }
+
+ tpd = edma_get_next_tpd(edma_cinfo, queue_id);
+ if (!start_tpd)
+ start_tpd = tpd;
+ sw_desc = edma_get_tx_buffer(edma_cinfo, tpd, queue_id);
+
+ /* The last buffer info contain the skb address,
+ * so skb will be freed after unmap
+ */
+ sw_desc->length = lso_desc_len;
+ sw_desc->flags |= EDMA_SW_DESC_FLAG_SKB_HEAD;
+
+ sw_desc->dma = dma_map_single(&adapter->pdev->dev,
+ skb->data, buf_len, DMA_TO_DEVICE);
+ if (dma_mapping_error(&pdev->dev, sw_desc->dma))
+ goto dma_error;
+
+ tpd->addr = cpu_to_le32(sw_desc->dma);
+ tpd->len = cpu_to_le16(buf_len);
+
+ tpd->svlan_tag = svlan_tag;
+ tpd->word1 = word1 | lso_word1;
+ tpd->word3 = word3;
+
+ /* The last buffer info contain the skb address,
+ * so it will be freed after unmap
+ */
+ sw_desc->length = lso_desc_len;
+ sw_desc->flags |= EDMA_SW_DESC_FLAG_SKB_HEAD;
+
+ buf_len = 0;
+ }
+
+ if (likely(buf_len)) {
+
+ /* TODO Do not dequeue descriptor if there is a potential error */
+ tpd = edma_get_next_tpd(edma_cinfo, queue_id);
+
+ if (!start_tpd)
+ start_tpd = tpd;
+
+ sw_desc = edma_get_tx_buffer(edma_cinfo, tpd, queue_id);
+
+ /* The last buffer info contain the skb address,
+ * so it will be free after unmap
+ */
+ sw_desc->length = buf_len;
+ sw_desc->flags |= EDMA_SW_DESC_FLAG_SKB_HEAD;
+ sw_desc->dma = dma_map_single(&adapter->pdev->dev,
+ skb->data, buf_len, DMA_TO_DEVICE);
+ if (dma_mapping_error(&pdev->dev, sw_desc->dma))
+ goto dma_error;
+
+ tpd->addr = cpu_to_le32(sw_desc->dma);
+ tpd->len = cpu_to_le16(buf_len);
+
+ tpd->svlan_tag = svlan_tag;
+ tpd->word1 = word1 | lso_word1;
+ tpd->word3 = word3;
+ }
+
+ /* Walk through all paged fragments */
+ while (nr_frags--) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+ buf_len = skb_frag_size(frag);
+ tpd = edma_get_next_tpd(edma_cinfo, queue_id);
+ sw_desc = edma_get_tx_buffer(edma_cinfo, tpd, queue_id);
+ sw_desc->length = buf_len;
+ sw_desc->flags |= EDMA_SW_DESC_FLAG_SKB_FRAG;
+
+ sw_desc->dma = skb_frag_dma_map(&pdev->dev, frag, 0, buf_len, DMA_TO_DEVICE);
+
+ if (dma_mapping_error(NULL, sw_desc->dma))
+ goto dma_error;
+
+ tpd->addr = cpu_to_le32(sw_desc->dma);
+ tpd->len = cpu_to_le16(buf_len);
+
+ tpd->svlan_tag = svlan_tag;
+ tpd->word1 = word1 | lso_word1;
+ tpd->word3 = word3;
+ i++;
+ }
+
+ /* Walk through all fraglist skbs */
+ skb_walk_frags(skb, iter_skb) {
+ buf_len = iter_skb->len;
+ tpd = edma_get_next_tpd(edma_cinfo, queue_id);
+ sw_desc = edma_get_tx_buffer(edma_cinfo, tpd, queue_id);
+ sw_desc->length = buf_len;
+ sw_desc->dma = dma_map_single(&adapter->pdev->dev,
+ iter_skb->data, buf_len, DMA_TO_DEVICE);
+
+ if (dma_mapping_error(NULL, sw_desc->dma))
+ goto dma_error;
+
+ tpd->addr = cpu_to_le32(sw_desc->dma);
+ tpd->len = cpu_to_le16(buf_len);
+ tpd->svlan_tag = svlan_tag;
+ tpd->word1 = word1 | lso_word1;
+ tpd->word3 = word3;
+ sw_desc->flags |= EDMA_SW_DESC_FLAG_SKB_FRAGLIST;
+ }
+
+ if (tpd)
+ tpd->word1 |= 1 << EDMA_TPD_EOP_SHIFT;
+
+ sw_desc->skb = skb;
+ sw_desc->flags |= EDMA_SW_DESC_FLAG_LAST;
+
+ return 0;
+
+dma_error:
+ edma_rollback_tx(adapter, start_tpd, queue_id);
+ dev_err(&pdev->dev, "TX DMA map failed\n");
+vlan_tag_error:
+ return -ENOMEM;
+}
+
+/* edma_check_link()
+ * check Link status
+ */
+static int edma_check_link(struct edma_adapter *adapter)
+{
+ struct phy_device *phydev = adapter->phydev;
+
+ if (!(adapter->poll_required))
+ return __EDMA_LINKUP;
+
+ if (phydev->link)
+ return __EDMA_LINKUP;
+
+ return __EDMA_LINKDOWN;
+}
+
+/* edma_adjust_link()
+ * check for edma link status
+ */
+void edma_adjust_link(struct net_device *netdev)
+{
+ int status;
+ struct edma_adapter *adapter = netdev_priv(netdev);
+ struct phy_device *phydev = adapter->phydev;
+
+ if (!test_bit(__EDMA_UP, &adapter->state_flags))
+ return;
+
+ status = edma_check_link(adapter);
+
+ if (status == __EDMA_LINKUP && adapter->link_state == __EDMA_LINKDOWN) {
+ dev_info(&adapter->pdev->dev, "%s: GMAC Link is up with phy_speed=%d\n", netdev->name, phydev->speed);
+ adapter->link_state = __EDMA_LINKUP;
+ if (adapter->edma_cinfo->is_single_phy) {
+ ess_set_port_status_speed(adapter->edma_cinfo, phydev,
+ ffs(adapter->dp_bitmap) - 1);
+ }
+ netif_carrier_on(netdev);
+ if (netif_running(netdev))
+ netif_tx_wake_all_queues(netdev);
+ } else if (status == __EDMA_LINKDOWN && adapter->link_state == __EDMA_LINKUP) {
+ dev_info(&adapter->pdev->dev, "%s: GMAC Link is down\n", netdev->name);
+ adapter->link_state = __EDMA_LINKDOWN;
+ netif_carrier_off(netdev);
+ netif_tx_stop_all_queues(netdev);
+ }
+}
+
+/* edma_get_stats()
+ * Statistics api used to retreive the tx/rx statistics
+ */
+struct net_device_stats *edma_get_stats(struct net_device *netdev)
+{
+ struct edma_adapter *adapter = netdev_priv(netdev);
+
+ return &adapter->stats;
+}
+
+/* edma_xmit()
+ * Main api to be called by the core for packet transmission
+ */
+netdev_tx_t edma_xmit(struct sk_buff *skb,
+ struct net_device *net_dev)
+{
+ struct edma_adapter *adapter = netdev_priv(net_dev);
+ struct edma_common_info *edma_cinfo = adapter->edma_cinfo;
+ struct edma_tx_desc_ring *etdr;
+ u16 from_cpu, dp_bitmap, txq_id;
+ int ret, nr_frags = 0, num_tpds_needed = 1, queue_id;
+ unsigned int flags_transmit = 0;
+ bool packet_is_rstp = false;
+ struct netdev_queue *nq = NULL;
+
+ if (skb_shinfo(skb)->nr_frags) {
+ nr_frags = skb_shinfo(skb)->nr_frags;
+ num_tpds_needed += nr_frags;
+ } else if (skb_has_frag_list(skb)) {
+ struct sk_buff *iter_skb;
+
+ skb_walk_frags(skb, iter_skb)
+ num_tpds_needed++;
+ }
+
+ if (num_tpds_needed > EDMA_MAX_SKB_FRAGS) {
+ dev_err(&net_dev->dev,
+ "skb received with fragments %d which is more than %lu",
+ num_tpds_needed, EDMA_MAX_SKB_FRAGS);
+ dev_kfree_skb_any(skb);
+ adapter->stats.tx_errors++;
+ return NETDEV_TX_OK;
+ }
+
+ if (edma_stp_rstp) {
+ u16 ath_hdr, ath_eth_type;
+ u8 mac_addr[EDMA_ETH_HDR_LEN];
+ ath_eth_type = ntohs(*(uint16_t *)&skb->data[12]);
+ if (ath_eth_type == edma_ath_eth_type) {
+ packet_is_rstp = true;
+ ath_hdr = htons(*(uint16_t *)&skb->data[14]);
+ dp_bitmap = ath_hdr & EDMA_TX_ATH_HDR_PORT_BITMAP_MASK;
+ from_cpu = (ath_hdr & EDMA_TX_ATH_HDR_FROM_CPU_MASK) >> EDMA_TX_ATH_HDR_FROM_CPU_SHIFT;
+ memcpy(mac_addr, skb->data, EDMA_ETH_HDR_LEN);
+
+ skb_pull(skb, 4);
+
+ memcpy(skb->data, mac_addr, EDMA_ETH_HDR_LEN);
+ }
+ }
+
+ /* this will be one of the 4 TX queues exposed to linux kernel */
+ txq_id = skb_get_queue_mapping(skb);
+ queue_id = edma_tx_queue_get(adapter, skb, txq_id);
+ etdr = edma_cinfo->tpd_ring[queue_id];
+ nq = netdev_get_tx_queue(net_dev, txq_id);
+
+ local_bh_disable();
+ /* Tx is not handled in bottom half context. Hence, we need to protect
+ * Tx from tasks and bottom half
+ */
+
+ if (num_tpds_needed > edma_tpd_available(edma_cinfo, queue_id)) {
+ /* not enough descriptor, just stop queue */
+ netif_tx_stop_queue(nq);
+ local_bh_enable();
+ dev_dbg(&net_dev->dev, "Not enough descriptors available");
+ edma_cinfo->edma_ethstats.tx_desc_error++;
+ return NETDEV_TX_BUSY;
+ }
+
+ /* Check and mark VLAN tag offload */
+ if (unlikely(skb_vlan_tag_present(skb)))
+ flags_transmit |= EDMA_VLAN_TX_TAG_INSERT_FLAG;
+ else if (!adapter->edma_cinfo->is_single_phy && adapter->default_vlan_tag)
+ flags_transmit |= EDMA_VLAN_TX_TAG_INSERT_DEFAULT_FLAG;
+
+ /* Check and mark checksum offload */
+ if (likely(skb->ip_summed == CHECKSUM_PARTIAL))
+ flags_transmit |= EDMA_HW_CHECKSUM;
+
+ /* Map and fill descriptor for Tx */
+ ret = edma_tx_map_and_fill(edma_cinfo, adapter, skb, queue_id,
+ flags_transmit, from_cpu, dp_bitmap, packet_is_rstp, nr_frags);
+ if (ret) {
+ dev_kfree_skb_any(skb);
+ adapter->stats.tx_errors++;
+ goto netdev_okay;
+ }
+
+ /* Update SW producer index */
+ edma_tx_update_hw_idx(edma_cinfo, skb, queue_id);
+
+ /* update tx statistics */
+ adapter->stats.tx_packets++;
+ adapter->stats.tx_bytes += skb->len;
+
+netdev_okay:
+ local_bh_enable();
+ return NETDEV_TX_OK;
+}
+
+/*
+ * edma_flow_may_expire()
+ * Timer function called periodically to delete the node
+ */
+void edma_flow_may_expire(struct timer_list *t)
+{
+ struct edma_rfs_flow_table *table = from_timer(table, t, expire_rfs);
+ struct edma_adapter *adapter =
+ container_of(table, typeof(*adapter), rfs);
+ int j;
+
+ spin_lock_bh(&adapter->rfs.rfs_ftab_lock);
+ for (j = 0; j < EDMA_RFS_EXPIRE_COUNT_PER_CALL; j++) {
+ struct hlist_head *hhead;
+ struct hlist_node *tmp;
+ struct edma_rfs_filter_node *n;
+ bool res;
+
+ hhead = &adapter->rfs.hlist_head[adapter->rfs.hashtoclean++];
+ hlist_for_each_entry_safe(n, tmp, hhead, node) {
+ res = rps_may_expire_flow(adapter->netdev, n->rq_id,
+ n->flow_id, n->filter_id);
+ if (res) {
+ int ret;
+ ret = edma_delete_rfs_filter(adapter, n);
+ if (ret < 0)
+ dev_dbg(&adapter->netdev->dev,
+ "RFS entry %d not allowed to be flushed by Switch",
+ n->flow_id);
+ else {
+ hlist_del(&n->node);
+ kfree(n);
+ adapter->rfs.filter_available++;
+ }
+ }
+ }
+ }
+
+ adapter->rfs.hashtoclean = adapter->rfs.hashtoclean & (EDMA_RFS_FLOW_ENTRIES - 1);
+ spin_unlock_bh(&adapter->rfs.rfs_ftab_lock);
+ mod_timer(&adapter->rfs.expire_rfs, jiffies + HZ / 4);
+}
+
+/* edma_rx_flow_steer()
+ * Called by core to to steer the flow to CPU
+ */
+int edma_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,
+ u16 rxq, u32 flow_id)
+{
+ struct flow_keys keys;
+ struct edma_rfs_filter_node *filter_node;
+ struct edma_adapter *adapter = netdev_priv(dev);
+ u16 hash_tblid;
+ int res;
+
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ dev_err(&adapter->pdev->dev, "IPv6 not supported\n");
+ res = -EINVAL;
+ goto no_protocol_err;
+ }
+
+ /* Dissect flow parameters
+ * We only support IPv4 + TCP/UDP
+ */
+ res = skb_flow_dissect_flow_keys(skb, &keys, 0);
+ if (!((keys.basic.ip_proto == IPPROTO_TCP) || (keys.basic.ip_proto == IPPROTO_UDP))) {
+ res = -EPROTONOSUPPORT;
+ goto no_protocol_err;
+ }
+
+ /* Check if table entry exists */
+ hash_tblid = skb_get_hash_raw(skb) & EDMA_RFS_FLOW_ENTRIES_MASK;
+
+ spin_lock_bh(&adapter->rfs.rfs_ftab_lock);
+ filter_node = edma_rfs_key_search(&adapter->rfs.hlist_head[hash_tblid], &keys);
+
+ if (filter_node) {
+ if (rxq == filter_node->rq_id) {
+ res = -EEXIST;
+ goto out;
+ } else {
+ res = edma_delete_rfs_filter(adapter, filter_node);
+ if (res < 0)
+ dev_warn(&adapter->netdev->dev,
+ "Cannot steer flow %d to different queue",
+ filter_node->flow_id);
+ else {
+ adapter->rfs.filter_available++;
+ res = edma_add_rfs_filter(adapter, &keys, rxq, filter_node);
+ if (res < 0) {
+ dev_warn(&adapter->netdev->dev,
+ "Cannot steer flow %d to different queue",
+ filter_node->flow_id);
+ } else {
+ adapter->rfs.filter_available--;
+ filter_node->rq_id = rxq;
+ filter_node->filter_id = res;
+ }
+ }
+ }
+ } else {
+ if (adapter->rfs.filter_available == 0) {
+ res = -EBUSY;
+ goto out;
+ }
+
+ filter_node = kmalloc(sizeof(*filter_node), GFP_ATOMIC);
+ if (!filter_node) {
+ res = -ENOMEM;
+ goto out;
+ }
+
+ res = edma_add_rfs_filter(adapter, &keys, rxq, filter_node);
+ if (res < 0) {
+ kfree(filter_node);
+ goto out;
+ }
+
+ adapter->rfs.filter_available--;
+ filter_node->rq_id = rxq;
+ filter_node->filter_id = res;
+ filter_node->flow_id = flow_id;
+ filter_node->keys = keys;
+ INIT_HLIST_NODE(&filter_node->node);
+ hlist_add_head(&filter_node->node, &adapter->rfs.hlist_head[hash_tblid]);
+ }
+
+out:
+ spin_unlock_bh(&adapter->rfs.rfs_ftab_lock);
+no_protocol_err:
+ return res;
+}
+
+/* edma_register_rfs_filter()
+ * Add RFS filter callback
+ */
+int edma_register_rfs_filter(struct net_device *netdev,
+ set_rfs_filter_callback_t set_filter)
+{
+ struct edma_adapter *adapter = netdev_priv(netdev);
+
+ spin_lock_bh(&adapter->rfs.rfs_ftab_lock);
+
+ if (adapter->set_rfs_rule) {
+ spin_unlock_bh(&adapter->rfs.rfs_ftab_lock);
+ return -1;
+ }
+
+ adapter->set_rfs_rule = set_filter;
+ spin_unlock_bh(&adapter->rfs.rfs_ftab_lock);
+
+ return 0;
+}
+
+/* edma_alloc_tx_rings()
+ * Allocate rx rings
+ */
+int edma_alloc_tx_rings(struct edma_common_info *edma_cinfo)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+ int i, err = 0;
+
+ for (i = 0; i < edma_cinfo->num_tx_queues; i++) {
+ err = edma_alloc_tx_ring(edma_cinfo, edma_cinfo->tpd_ring[i]);
+ if (err) {
+ dev_err(&pdev->dev, "Tx Queue alloc %u failed\n", i);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+/* edma_free_tx_rings()
+ * Free tx rings
+ */
+void edma_free_tx_rings(struct edma_common_info *edma_cinfo)
+{
+ int i;
+
+ for (i = 0; i < edma_cinfo->num_tx_queues; i++)
+ edma_free_tx_ring(edma_cinfo, edma_cinfo->tpd_ring[i]);
+}
+
+/* edma_free_tx_resources()
+ * Free buffers associated with tx rings
+ */
+void edma_free_tx_resources(struct edma_common_info *edma_cinfo)
+{
+ struct edma_tx_desc_ring *etdr;
+ struct edma_sw_desc *sw_desc;
+ struct platform_device *pdev = edma_cinfo->pdev;
+ int i, j;
+
+ for (i = 0; i < edma_cinfo->num_tx_queues; i++) {
+ etdr = edma_cinfo->tpd_ring[i];
+ for (j = 0; j < EDMA_TX_RING_SIZE; j++) {
+ sw_desc = &etdr->sw_desc[j];
+ if (sw_desc->flags & (EDMA_SW_DESC_FLAG_SKB_HEAD |
+ EDMA_SW_DESC_FLAG_SKB_FRAG | EDMA_SW_DESC_FLAG_SKB_FRAGLIST))
+ edma_tx_unmap_and_free(pdev, sw_desc);
+ }
+ }
+}
+
+/* edma_alloc_rx_rings()
+ * Allocate rx rings
+ */
+int edma_alloc_rx_rings(struct edma_common_info *edma_cinfo)
+{
+ struct platform_device *pdev = edma_cinfo->pdev;
+ int i, j, err = 0;
+
+ for (i = 0, j = 0; i < edma_cinfo->num_rx_queues; i++) {
+ err = edma_alloc_rx_ring(edma_cinfo, edma_cinfo->rfd_ring[j]);
+ if (err) {
+ dev_err(&pdev->dev, "Rx Queue alloc%u failed\n", i);
+ return err;
+ }
+ j += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+ }
+
+ return 0;
+}
+
+/* edma_free_rx_rings()
+ * free rx rings
+ */
+void edma_free_rx_rings(struct edma_common_info *edma_cinfo)
+{
+ int i, j;
+
+ for (i = 0, j = 0; i < edma_cinfo->num_rx_queues; i++) {
+ edma_free_rx_ring(edma_cinfo, edma_cinfo->rfd_ring[j]);
+ j += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+ }
+}
+
+/* edma_free_queues()
+ * Free the queues allocaated
+ */
+void edma_free_queues(struct edma_common_info *edma_cinfo)
+{
+ int i , j;
+
+ for (i = 0; i < edma_cinfo->num_tx_queues; i++) {
+ if (edma_cinfo->tpd_ring[i])
+ kfree(edma_cinfo->tpd_ring[i]);
+ edma_cinfo->tpd_ring[i] = NULL;
+ }
+
+ for (i = 0, j = 0; i < edma_cinfo->num_rx_queues; i++) {
+ if (edma_cinfo->rfd_ring[j])
+ kfree(edma_cinfo->rfd_ring[j]);
+ edma_cinfo->rfd_ring[j] = NULL;
+ j += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+ }
+
+ edma_cinfo->num_rx_queues = 0;
+ edma_cinfo->num_tx_queues = 0;
+
+ return;
+}
+
+/* edma_free_rx_resources()
+ * Free buffers associated with tx rings
+ */
+void edma_free_rx_resources(struct edma_common_info *edma_cinfo)
+{
+ struct edma_rfd_desc_ring *erdr;
+ struct edma_sw_desc *sw_desc;
+ struct platform_device *pdev = edma_cinfo->pdev;
+ int i, j, k;
+
+ for (i = 0, k = 0; i < edma_cinfo->num_rx_queues; i++) {
+ erdr = edma_cinfo->rfd_ring[k];
+ for (j = 0; j < EDMA_RX_RING_SIZE; j++) {
+ sw_desc = &erdr->sw_desc[j];
+ if (likely(sw_desc->flags & EDMA_SW_DESC_FLAG_SKB_HEAD)) {
+ dma_unmap_single(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_FROM_DEVICE);
+ edma_clean_rfd(erdr, j);
+ } else if ((sw_desc->flags & EDMA_SW_DESC_FLAG_SKB_FRAG)) {
+ dma_unmap_page(&pdev->dev, sw_desc->dma,
+ sw_desc->length, DMA_FROM_DEVICE);
+ edma_clean_rfd(erdr, j);
+ }
+ }
+ k += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+
+ }
+}
+
+/* edma_alloc_queues_tx()
+ * Allocate memory for all rings
+ */
+int edma_alloc_queues_tx(struct edma_common_info *edma_cinfo)
+{
+ int i;
+
+ for (i = 0; i < edma_cinfo->num_tx_queues; i++) {
+ struct edma_tx_desc_ring *etdr;
+ etdr = kzalloc(sizeof(struct edma_tx_desc_ring), GFP_KERNEL);
+ if (!etdr)
+ goto err;
+ etdr->count = edma_cinfo->tx_ring_count;
+ edma_cinfo->tpd_ring[i] = etdr;
+ }
+
+ return 0;
+err:
+ edma_free_queues(edma_cinfo);
+ return -1;
+}
+
+/* edma_alloc_queues_rx()
+ * Allocate memory for all rings
+ */
+int edma_alloc_queues_rx(struct edma_common_info *edma_cinfo)
+{
+ int i, j;
+
+ for (i = 0, j = 0; i < edma_cinfo->num_rx_queues; i++) {
+ struct edma_rfd_desc_ring *rfd_ring;
+ rfd_ring = kzalloc(sizeof(struct edma_rfd_desc_ring),
+ GFP_KERNEL);
+ if (!rfd_ring)
+ goto err;
+ rfd_ring->count = edma_cinfo->rx_ring_count;
+ edma_cinfo->rfd_ring[j] = rfd_ring;
+ j += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+ }
+ return 0;
+err:
+ edma_free_queues(edma_cinfo);
+ return -1;
+}
+
+/* edma_clear_irq_status()
+ * Clear interrupt status
+ */
+void edma_clear_irq_status()
+{
+ edma_write_reg(EDMA_REG_RX_ISR, 0xff);
+ edma_write_reg(EDMA_REG_TX_ISR, 0xffff);
+ edma_write_reg(EDMA_REG_MISC_ISR, 0x1fff);
+ edma_write_reg(EDMA_REG_WOL_ISR, 0x1);
+};
+
+/* edma_configure()
+ * Configure skb, edma interrupts and control register.
+ */
+int edma_configure(struct edma_common_info *edma_cinfo)
+{
+ struct edma_hw *hw = &edma_cinfo->hw;
+ u32 intr_modrt_data;
+ u32 intr_ctrl_data = 0;
+ int i, j, ret_count;
+
+ edma_read_reg(EDMA_REG_INTR_CTRL, &intr_ctrl_data);
+ intr_ctrl_data &= ~(1 << EDMA_INTR_SW_IDX_W_TYP_SHIFT);
+ intr_ctrl_data |= hw->intr_sw_idx_w << EDMA_INTR_SW_IDX_W_TYP_SHIFT;
+ edma_write_reg(EDMA_REG_INTR_CTRL, intr_ctrl_data);
+
+ edma_clear_irq_status();
+
+ /* Clear any WOL status */
+ edma_write_reg(EDMA_REG_WOL_CTRL, 0);
+ intr_modrt_data = (EDMA_TX_IMT << EDMA_IRQ_MODRT_TX_TIMER_SHIFT);
+ intr_modrt_data |= (EDMA_RX_IMT << EDMA_IRQ_MODRT_RX_TIMER_SHIFT);
+ edma_write_reg(EDMA_REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
+ edma_configure_tx(edma_cinfo);
+ edma_configure_rx(edma_cinfo);
+
+ /* Allocate the RX buffer */
+ for (i = 0, j = 0; i < edma_cinfo->num_rx_queues; i++) {
+ struct edma_rfd_desc_ring *ring = edma_cinfo->rfd_ring[j];
+ ret_count = edma_alloc_rx_buf(edma_cinfo, ring, ring->count, j);
+ if (ret_count) {
+ dev_dbg(&edma_cinfo->pdev->dev, "not all rx buffers allocated\n");
+ }
+ j += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+ }
+
+ /* Configure descriptor Ring */
+ edma_init_desc(edma_cinfo);
+ return 0;
+}
+
+/* edma_irq_enable()
+ * Enable default interrupt generation settings
+ */
+void edma_irq_enable(struct edma_common_info *edma_cinfo)
+{
+ struct edma_hw *hw = &edma_cinfo->hw;
+ int i, j;
+
+ edma_write_reg(EDMA_REG_RX_ISR, 0xff);
+ for (i = 0, j = 0; i < edma_cinfo->num_rx_queues; i++) {
+ edma_write_reg(EDMA_REG_RX_INT_MASK_Q(j), hw->rx_intr_mask);
+ j += ((edma_cinfo->num_rx_queues == 4) ? 2 : 1);
+ }
+ edma_write_reg(EDMA_REG_TX_ISR, 0xffff);
+ for (i = 0; i < edma_cinfo->num_tx_queues; i++)
+ edma_write_reg(EDMA_REG_TX_INT_MASK_Q(i), hw->tx_intr_mask);
+}
+
+/* edma_irq_disable()
+ * Disable Interrupt
+ */
+void edma_irq_disable(struct edma_common_info *edma_cinfo)
+{
+ int i;
+
+ for (i = 0; i < EDMA_MAX_RECEIVE_QUEUE; i++)
+ edma_write_reg(EDMA_REG_RX_INT_MASK_Q(i), 0x0);
+
+ for (i = 0; i < EDMA_MAX_TRANSMIT_QUEUE; i++)
+ edma_write_reg(EDMA_REG_TX_INT_MASK_Q(i), 0x0);
+ edma_write_reg(EDMA_REG_MISC_IMR, 0);
+ edma_write_reg(EDMA_REG_WOL_IMR, 0);
+}
+
+/* edma_free_irqs()
+ * Free All IRQs
+ */
+void edma_free_irqs(struct edma_adapter *adapter)
+{
+ struct edma_common_info *edma_cinfo = adapter->edma_cinfo;
+ int i, j;
+ int k = ((edma_cinfo->num_rx_queues == 4) ? 1 : 2);
+
+ for (i = 0; i < CONFIG_NR_CPUS; i++) {
+ for (j = edma_cinfo->edma_percpu_info[i].tx_start; j < (edma_cinfo->edma_percpu_info[i].tx_start + 4); j++)
+ free_irq(edma_cinfo->tx_irq[j], &edma_cinfo->edma_percpu_info[i]);
+
+ for (j = edma_cinfo->edma_percpu_info[i].rx_start; j < (edma_cinfo->edma_percpu_info[i].rx_start + k); j++)
+ free_irq(edma_cinfo->rx_irq[j], &edma_cinfo->edma_percpu_info[i]);
+ }
+}
+
+/* edma_enable_rx_ctrl()
+ * Enable RX queue control
+ */
+void edma_enable_rx_ctrl(struct edma_hw *hw)
+{
+ u32 data;
+
+ edma_read_reg(EDMA_REG_RXQ_CTRL, &data);
+ data |= EDMA_RXQ_CTRL_EN;
+ edma_write_reg(EDMA_REG_RXQ_CTRL, data);
+}
+
+
+/* edma_enable_tx_ctrl()
+ * Enable TX queue control
+ */
+void edma_enable_tx_ctrl(struct edma_hw *hw)
+{
+ u32 data;
+
+ edma_read_reg(EDMA_REG_TXQ_CTRL, &data);
+ data |= EDMA_TXQ_CTRL_TXQ_EN;
+ edma_write_reg(EDMA_REG_TXQ_CTRL, data);
+}
+
+/* edma_stop_rx_tx()
+ * Disable RX/TQ Queue control
+ */
+void edma_stop_rx_tx(struct edma_hw *hw)
+{
+ u32 data;
+
+ edma_read_reg(EDMA_REG_RXQ_CTRL, &data);
+ data &= ~EDMA_RXQ_CTRL_EN;
+ edma_write_reg(EDMA_REG_RXQ_CTRL, data);
+ edma_read_reg(EDMA_REG_TXQ_CTRL, &data);
+ data &= ~EDMA_TXQ_CTRL_TXQ_EN;
+ edma_write_reg(EDMA_REG_TXQ_CTRL, data);
+}
+
+/* edma_reset()
+ * Reset the EDMA
+ */
+int edma_reset(struct edma_common_info *edma_cinfo)
+{
+ struct edma_hw *hw = &edma_cinfo->hw;
+
+ edma_irq_disable(edma_cinfo);
+
+ edma_clear_irq_status();
+
+ edma_stop_rx_tx(hw);
+
+ return 0;
+}
+
+/* edma_fill_netdev()
+ * Fill netdev for each etdr
+ */
+int edma_fill_netdev(struct edma_common_info *edma_cinfo, int queue_id,
+ int dev, int txq_id)
+{
+ struct edma_tx_desc_ring *etdr;
+ int i = 0;
+
+ etdr = edma_cinfo->tpd_ring[queue_id];
+
+ while (etdr->netdev[i])
+ i++;
+
+ if (i >= EDMA_MAX_NETDEV_PER_QUEUE)
+ return -1;
+
+ /* Populate the netdev associated with the tpd ring */
+ etdr->netdev[i] = edma_netdev[dev];
+ etdr->nq[i] = netdev_get_tx_queue(edma_netdev[dev], txq_id);
+
+ return 0;
+}
+
+/* edma_set_mac()
+ * Change the Ethernet Address of the NIC
+ */
+int edma_set_mac_addr(struct net_device *netdev, void *p)
+{
+ struct sockaddr *addr = p;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EINVAL;
+
+ if (netif_running(netdev))
+ return -EBUSY;
+
+ memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
+ return 0;
+}
+
+/* edma_set_stp_rstp()
+ * set stp/rstp
+ */
+void edma_set_stp_rstp(bool rstp)
+{
+ edma_stp_rstp = rstp;
+}
+
+/* edma_assign_ath_hdr_type()
+ * assign atheros header eth type
+ */
+void edma_assign_ath_hdr_type(int eth_type)
+{
+ edma_ath_eth_type = eth_type & EDMA_ETH_TYPE_MASK;
+}
+
+/* edma_get_default_vlan_tag()
+ * Used by other modules to get the default vlan tag
+ */
+int edma_get_default_vlan_tag(struct net_device *netdev)
+{
+ struct edma_adapter *adapter = netdev_priv(netdev);
+
+ if (adapter->default_vlan_tag)
+ return adapter->default_vlan_tag;
+
+ return 0;
+}
+
+/* edma_open()
+ * gets called when netdevice is up, start the queue.
+ */
+int edma_open(struct net_device *netdev)
+{
+ struct edma_adapter *adapter = netdev_priv(netdev);
+ struct platform_device *pdev = adapter->edma_cinfo->pdev;
+
+ netif_tx_start_all_queues(netdev);
+ edma_initialise_rfs_flow_table(adapter);
+ set_bit(__EDMA_UP, &adapter->state_flags);
+
+ /* if Link polling is enabled, in our case enabled for WAN, then
+ * do a phy start, else always set link as UP
+ */
+ if (adapter->poll_required) {
+ if (!IS_ERR(adapter->phydev)) {
+ phy_start(adapter->phydev);
+ phy_start_aneg(adapter->phydev);
+ adapter->link_state = __EDMA_LINKDOWN;
+ } else {
+ dev_dbg(&pdev->dev, "Invalid PHY device for a link polled interface\n");
+ }
+ } else {
+ adapter->link_state = __EDMA_LINKUP;
+ netif_carrier_on(netdev);
+ }
+
+ return 0;
+}
+
+
+/* edma_close()
+ * gets called when netdevice is down, stops the queue.
+ */
+int edma_close(struct net_device *netdev)
+{
+ struct edma_adapter *adapter = netdev_priv(netdev);
+
+ edma_free_rfs_flow_table(adapter);
+ netif_carrier_off(netdev);
+ netif_tx_stop_all_queues(netdev);
+
+ if (adapter->poll_required) {
+ if (!IS_ERR(adapter->phydev))
+ phy_stop(adapter->phydev);
+ }
+
+ adapter->link_state = __EDMA_LINKDOWN;
+
+ /* Set GMAC state to UP before link state is checked
+ */
+ clear_bit(__EDMA_UP, &adapter->state_flags);
+
+ return 0;
+}
+
+/* edma_poll
+ * polling function that gets called when the napi gets scheduled.
+ *
+ * Main sequence of task performed in this api
+ * is clear irq status -> clear_tx_irq -> clean_rx_irq->
+ * enable interrupts.
+ */
+int edma_poll(struct napi_struct *napi, int budget)
+{
+ struct edma_per_cpu_queues_info *edma_percpu_info = container_of(napi,
+ struct edma_per_cpu_queues_info, napi);
+ struct edma_common_info *edma_cinfo = edma_percpu_info->edma_cinfo;
+ u32 reg_data;
+ u32 shadow_rx_status, shadow_tx_status;
+ int queue_id;
+ int i, work_done = 0;
+ u16 rx_pending_fill;
+
+ /* Store the Rx/Tx status by ANDing it with
+ * appropriate CPU RX?TX mask
+ */
+ edma_read_reg(EDMA_REG_RX_ISR, ®_data);
+ edma_percpu_info->rx_status |= reg_data & edma_percpu_info->rx_mask;
+ shadow_rx_status = edma_percpu_info->rx_status;
+ edma_read_reg(EDMA_REG_TX_ISR, ®_data);
+ edma_percpu_info->tx_status |= reg_data & edma_percpu_info->tx_mask;
+ shadow_tx_status = edma_percpu_info->tx_status;
+
+ /* Every core will have a start, which will be computed
+ * in probe and stored in edma_percpu_info->tx_start variable.
+ * We will shift the status bit by tx_start to obtain
+ * status bits for the core on which the current processing
+ * is happening. Since, there are 4 tx queues per core,
+ * we will run the loop till we get the correct queue to clear.
+ */
+ while (edma_percpu_info->tx_status) {
+ queue_id = ffs(edma_percpu_info->tx_status) - 1;
+ edma_tx_complete(edma_cinfo, queue_id);
+ edma_percpu_info->tx_status &= ~(1 << queue_id);
+ }
+
+ /* Every core will have a start, which will be computed
+ * in probe and stored in edma_percpu_info->tx_start variable.
+ * We will shift the status bit by tx_start to obtain
+ * status bits for the core on which the current processing
+ * is happening. Since, there are 4 tx queues per core, we
+ * will run the loop till we get the correct queue to clear.
+ */
+ while (edma_percpu_info->rx_status) {
+ queue_id = ffs(edma_percpu_info->rx_status) - 1;
+ rx_pending_fill = edma_rx_complete(edma_cinfo, &work_done,
+ budget, queue_id, napi);
+
+ if (likely(work_done < budget)) {
+ if (rx_pending_fill) {
+ /* reschedule poll() to refill rx buffer deficit */
+ work_done = budget;
+ break;
+ }
+ edma_percpu_info->rx_status &= ~(1 << queue_id);
+ } else {
+ break;
+ }
+ }
+
+ /* Clear the status register, to avoid the interrupts to
+ * reoccur.This clearing of interrupt status register is
+ * done here as writing to status register only takes place
+ * once the producer/consumer index has been updated to
+ * reflect that the packet transmission/reception went fine.
+ */
+ edma_write_reg(EDMA_REG_RX_ISR, shadow_rx_status);
+ edma_write_reg(EDMA_REG_TX_ISR, shadow_tx_status);
+
+ /* If budget not fully consumed, exit the polling mode */
+ if (likely(work_done < budget)) {
+ napi_complete(napi);
+
+ /* re-enable the interrupts */
+ for (i = 0; i < edma_cinfo->num_rxq_per_core; i++)
+ edma_write_reg(EDMA_REG_RX_INT_MASK_Q(edma_percpu_info->rx_start + i), 0x1);
+ for (i = 0; i < edma_cinfo->num_txq_per_core; i++)
+ edma_write_reg(EDMA_REG_TX_INT_MASK_Q(edma_percpu_info->tx_start + i), 0x1);
+ }
+
+ return work_done;
+}
+
+/* edma interrupt()
+ * interrupt handler
+ */
+irqreturn_t edma_interrupt(int irq, void *dev)
+{
+ struct edma_per_cpu_queues_info *edma_percpu_info = (struct edma_per_cpu_queues_info *) dev;
+ struct edma_common_info *edma_cinfo = edma_percpu_info->edma_cinfo;
+ int i;
+
+ /* Unmask the TX/RX interrupt register */
+ for (i = 0; i < edma_cinfo->num_rxq_per_core; i++)
+ edma_write_reg(EDMA_REG_RX_INT_MASK_Q(edma_percpu_info->rx_start + i), 0x0);
+
+ for (i = 0; i < edma_cinfo->num_txq_per_core; i++)
+ edma_write_reg(EDMA_REG_TX_INT_MASK_Q(edma_percpu_info->tx_start + i), 0x0);
+
+ napi_schedule(&edma_percpu_info->napi);
+
+ return IRQ_HANDLED;
+}
projects / openwrt / openwrt.git / blobdiff