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path: root/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c
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Diffstat (limited to 'drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c')
-rw-r--r--drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c644
1 files changed, 644 insertions, 0 deletions
diff --git a/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c b/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c
new file mode 100644
index 000000000000..e9672b1f9968
--- /dev/null
+++ b/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c
@@ -0,0 +1,644 @@
+/* Synopsys DesignWare Core Enterprise Ethernet (XLGMAC) Driver
+ *
+ * Copyright (c) 2017 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is dual-licensed; you may select either version 2 of
+ * the GNU General Public License ("GPL") or BSD license ("BSD").
+ *
+ * This Synopsys DWC XLGMAC software driver and associated documentation
+ * (hereinafter the "Software") is an unsupported proprietary work of
+ * Synopsys, Inc. unless otherwise expressly agreed to in writing between
+ * Synopsys and you. The Software IS NOT an item of Licensed Software or a
+ * Licensed Product under any End User Software License Agreement or
+ * Agreement for Licensed Products with Synopsys or any supplement thereto.
+ * Synopsys is a registered trademark of Synopsys, Inc. Other names included
+ * in the SOFTWARE may be the trademarks of their respective owners.
+ */
+
+#include "dwc-xlgmac.h"
+#include "dwc-xlgmac-reg.h"
+
+static void xlgmac_unmap_desc_data(struct xlgmac_pdata *pdata,
+ struct xlgmac_desc_data *desc_data)
+{
+ if (desc_data->skb_dma) {
+ if (desc_data->mapped_as_page) {
+ dma_unmap_page(pdata->dev, desc_data->skb_dma,
+ desc_data->skb_dma_len, DMA_TO_DEVICE);
+ } else {
+ dma_unmap_single(pdata->dev, desc_data->skb_dma,
+ desc_data->skb_dma_len, DMA_TO_DEVICE);
+ }
+ desc_data->skb_dma = 0;
+ desc_data->skb_dma_len = 0;
+ }
+
+ if (desc_data->skb) {
+ dev_kfree_skb_any(desc_data->skb);
+ desc_data->skb = NULL;
+ }
+
+ if (desc_data->rx.hdr.pa.pages)
+ put_page(desc_data->rx.hdr.pa.pages);
+
+ if (desc_data->rx.hdr.pa_unmap.pages) {
+ dma_unmap_page(pdata->dev, desc_data->rx.hdr.pa_unmap.pages_dma,
+ desc_data->rx.hdr.pa_unmap.pages_len,
+ DMA_FROM_DEVICE);
+ put_page(desc_data->rx.hdr.pa_unmap.pages);
+ }
+
+ if (desc_data->rx.buf.pa.pages)
+ put_page(desc_data->rx.buf.pa.pages);
+
+ if (desc_data->rx.buf.pa_unmap.pages) {
+ dma_unmap_page(pdata->dev, desc_data->rx.buf.pa_unmap.pages_dma,
+ desc_data->rx.buf.pa_unmap.pages_len,
+ DMA_FROM_DEVICE);
+ put_page(desc_data->rx.buf.pa_unmap.pages);
+ }
+
+ memset(&desc_data->tx, 0, sizeof(desc_data->tx));
+ memset(&desc_data->rx, 0, sizeof(desc_data->rx));
+
+ desc_data->mapped_as_page = 0;
+
+ if (desc_data->state_saved) {
+ desc_data->state_saved = 0;
+ desc_data->state.skb = NULL;
+ desc_data->state.len = 0;
+ desc_data->state.error = 0;
+ }
+}
+
+static void xlgmac_free_ring(struct xlgmac_pdata *pdata,
+ struct xlgmac_ring *ring)
+{
+ struct xlgmac_desc_data *desc_data;
+ unsigned int i;
+
+ if (!ring)
+ return;
+
+ if (ring->desc_data_head) {
+ for (i = 0; i < ring->dma_desc_count; i++) {
+ desc_data = XLGMAC_GET_DESC_DATA(ring, i);
+ xlgmac_unmap_desc_data(pdata, desc_data);
+ }
+
+ kfree(ring->desc_data_head);
+ ring->desc_data_head = NULL;
+ }
+
+ if (ring->rx_hdr_pa.pages) {
+ dma_unmap_page(pdata->dev, ring->rx_hdr_pa.pages_dma,
+ ring->rx_hdr_pa.pages_len, DMA_FROM_DEVICE);
+ put_page(ring->rx_hdr_pa.pages);
+
+ ring->rx_hdr_pa.pages = NULL;
+ ring->rx_hdr_pa.pages_len = 0;
+ ring->rx_hdr_pa.pages_offset = 0;
+ ring->rx_hdr_pa.pages_dma = 0;
+ }
+
+ if (ring->rx_buf_pa.pages) {
+ dma_unmap_page(pdata->dev, ring->rx_buf_pa.pages_dma,
+ ring->rx_buf_pa.pages_len, DMA_FROM_DEVICE);
+ put_page(ring->rx_buf_pa.pages);
+
+ ring->rx_buf_pa.pages = NULL;
+ ring->rx_buf_pa.pages_len = 0;
+ ring->rx_buf_pa.pages_offset = 0;
+ ring->rx_buf_pa.pages_dma = 0;
+ }
+
+ if (ring->dma_desc_head) {
+ dma_free_coherent(pdata->dev,
+ (sizeof(struct xlgmac_dma_desc) *
+ ring->dma_desc_count),
+ ring->dma_desc_head,
+ ring->dma_desc_head_addr);
+ ring->dma_desc_head = NULL;
+ }
+}
+
+static int xlgmac_init_ring(struct xlgmac_pdata *pdata,
+ struct xlgmac_ring *ring,
+ unsigned int dma_desc_count)
+{
+ if (!ring)
+ return 0;
+
+ /* Descriptors */
+ ring->dma_desc_count = dma_desc_count;
+ ring->dma_desc_head = dma_alloc_coherent(pdata->dev,
+ (sizeof(struct xlgmac_dma_desc) *
+ dma_desc_count),
+ &ring->dma_desc_head_addr,
+ GFP_KERNEL);
+ if (!ring->dma_desc_head)
+ return -ENOMEM;
+
+ /* Array of descriptor data */
+ ring->desc_data_head = kcalloc(dma_desc_count,
+ sizeof(struct xlgmac_desc_data),
+ GFP_KERNEL);
+ if (!ring->desc_data_head)
+ return -ENOMEM;
+
+ netif_dbg(pdata, drv, pdata->netdev,
+ "dma_desc_head=%p, dma_desc_head_addr=%pad, desc_data_head=%p\n",
+ ring->dma_desc_head,
+ &ring->dma_desc_head_addr,
+ ring->desc_data_head);
+
+ return 0;
+}
+
+static void xlgmac_free_rings(struct xlgmac_pdata *pdata)
+{
+ struct xlgmac_channel *channel;
+ unsigned int i;
+
+ if (!pdata->channel_head)
+ return;
+
+ channel = pdata->channel_head;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ xlgmac_free_ring(pdata, channel->tx_ring);
+ xlgmac_free_ring(pdata, channel->rx_ring);
+ }
+}
+
+static int xlgmac_alloc_rings(struct xlgmac_pdata *pdata)
+{
+ struct xlgmac_channel *channel;
+ unsigned int i;
+ int ret;
+
+ channel = pdata->channel_head;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ netif_dbg(pdata, drv, pdata->netdev, "%s - Tx ring:\n",
+ channel->name);
+
+ ret = xlgmac_init_ring(pdata, channel->tx_ring,
+ pdata->tx_desc_count);
+
+ if (ret) {
+ netdev_alert(pdata->netdev,
+ "error initializing Tx ring");
+ goto err_init_ring;
+ }
+
+ netif_dbg(pdata, drv, pdata->netdev, "%s - Rx ring:\n",
+ channel->name);
+
+ ret = xlgmac_init_ring(pdata, channel->rx_ring,
+ pdata->rx_desc_count);
+ if (ret) {
+ netdev_alert(pdata->netdev,
+ "error initializing Rx ring\n");
+ goto err_init_ring;
+ }
+ }
+
+ return 0;
+
+err_init_ring:
+ xlgmac_free_rings(pdata);
+
+ return ret;
+}
+
+static void xlgmac_free_channels(struct xlgmac_pdata *pdata)
+{
+ if (!pdata->channel_head)
+ return;
+
+ kfree(pdata->channel_head->tx_ring);
+ pdata->channel_head->tx_ring = NULL;
+
+ kfree(pdata->channel_head->rx_ring);
+ pdata->channel_head->rx_ring = NULL;
+
+ kfree(pdata->channel_head);
+
+ pdata->channel_head = NULL;
+ pdata->channel_count = 0;
+}
+
+static int xlgmac_alloc_channels(struct xlgmac_pdata *pdata)
+{
+ struct xlgmac_channel *channel_head, *channel;
+ struct xlgmac_ring *tx_ring, *rx_ring;
+ int ret = -ENOMEM;
+ unsigned int i;
+
+ channel_head = kcalloc(pdata->channel_count,
+ sizeof(struct xlgmac_channel), GFP_KERNEL);
+ if (!channel_head)
+ return ret;
+
+ netif_dbg(pdata, drv, pdata->netdev,
+ "channel_head=%p\n", channel_head);
+
+ tx_ring = kcalloc(pdata->tx_ring_count, sizeof(struct xlgmac_ring),
+ GFP_KERNEL);
+ if (!tx_ring)
+ goto err_tx_ring;
+
+ rx_ring = kcalloc(pdata->rx_ring_count, sizeof(struct xlgmac_ring),
+ GFP_KERNEL);
+ if (!rx_ring)
+ goto err_rx_ring;
+
+ for (i = 0, channel = channel_head; i < pdata->channel_count;
+ i++, channel++) {
+ snprintf(channel->name, sizeof(channel->name), "channel-%u", i);
+ channel->pdata = pdata;
+ channel->queue_index = i;
+ channel->dma_regs = pdata->mac_regs + DMA_CH_BASE +
+ (DMA_CH_INC * i);
+
+ if (pdata->per_channel_irq) {
+ /* Get the per DMA interrupt */
+ ret = pdata->channel_irq[i];
+ if (ret < 0) {
+ netdev_err(pdata->netdev,
+ "get_irq %u failed\n",
+ i + 1);
+ goto err_irq;
+ }
+ channel->dma_irq = ret;
+ }
+
+ if (i < pdata->tx_ring_count)
+ channel->tx_ring = tx_ring++;
+
+ if (i < pdata->rx_ring_count)
+ channel->rx_ring = rx_ring++;
+
+ netif_dbg(pdata, drv, pdata->netdev,
+ "%s: dma_regs=%p, tx_ring=%p, rx_ring=%p\n",
+ channel->name, channel->dma_regs,
+ channel->tx_ring, channel->rx_ring);
+ }
+
+ pdata->channel_head = channel_head;
+
+ return 0;
+
+err_irq:
+ kfree(rx_ring);
+
+err_rx_ring:
+ kfree(tx_ring);
+
+err_tx_ring:
+ kfree(channel_head);
+
+ return ret;
+}
+
+static void xlgmac_free_channels_and_rings(struct xlgmac_pdata *pdata)
+{
+ xlgmac_free_rings(pdata);
+
+ xlgmac_free_channels(pdata);
+}
+
+static int xlgmac_alloc_channels_and_rings(struct xlgmac_pdata *pdata)
+{
+ int ret;
+
+ ret = xlgmac_alloc_channels(pdata);
+ if (ret)
+ goto err_alloc;
+
+ ret = xlgmac_alloc_rings(pdata);
+ if (ret)
+ goto err_alloc;
+
+ return 0;
+
+err_alloc:
+ xlgmac_free_channels_and_rings(pdata);
+
+ return ret;
+}
+
+static int xlgmac_alloc_pages(struct xlgmac_pdata *pdata,
+ struct xlgmac_page_alloc *pa,
+ gfp_t gfp, int order)
+{
+ struct page *pages = NULL;
+ dma_addr_t pages_dma;
+
+ /* Try to obtain pages, decreasing order if necessary */
+ gfp |= __GFP_COLD | __GFP_COMP | __GFP_NOWARN;
+ while (order >= 0) {
+ pages = alloc_pages(gfp, order);
+ if (pages)
+ break;
+
+ order--;
+ }
+ if (!pages)
+ return -ENOMEM;
+
+ /* Map the pages */
+ pages_dma = dma_map_page(pdata->dev, pages, 0,
+ PAGE_SIZE << order, DMA_FROM_DEVICE);
+ if (dma_mapping_error(pdata->dev, pages_dma)) {
+ put_page(pages);
+ return -ENOMEM;
+ }
+
+ pa->pages = pages;
+ pa->pages_len = PAGE_SIZE << order;
+ pa->pages_offset = 0;
+ pa->pages_dma = pages_dma;
+
+ return 0;
+}
+
+static void xlgmac_set_buffer_data(struct xlgmac_buffer_data *bd,
+ struct xlgmac_page_alloc *pa,
+ unsigned int len)
+{
+ get_page(pa->pages);
+ bd->pa = *pa;
+
+ bd->dma_base = pa->pages_dma;
+ bd->dma_off = pa->pages_offset;
+ bd->dma_len = len;
+
+ pa->pages_offset += len;
+ if ((pa->pages_offset + len) > pa->pages_len) {
+ /* This data descriptor is responsible for unmapping page(s) */
+ bd->pa_unmap = *pa;
+
+ /* Get a new allocation next time */
+ pa->pages = NULL;
+ pa->pages_len = 0;
+ pa->pages_offset = 0;
+ pa->pages_dma = 0;
+ }
+}
+
+static int xlgmac_map_rx_buffer(struct xlgmac_pdata *pdata,
+ struct xlgmac_ring *ring,
+ struct xlgmac_desc_data *desc_data)
+{
+ int order, ret;
+
+ if (!ring->rx_hdr_pa.pages) {
+ ret = xlgmac_alloc_pages(pdata, &ring->rx_hdr_pa,
+ GFP_ATOMIC, 0);
+ if (ret)
+ return ret;
+ }
+
+ if (!ring->rx_buf_pa.pages) {
+ order = max_t(int, PAGE_ALLOC_COSTLY_ORDER - 1, 0);
+ ret = xlgmac_alloc_pages(pdata, &ring->rx_buf_pa,
+ GFP_ATOMIC, order);
+ if (ret)
+ return ret;
+ }
+
+ /* Set up the header page info */
+ xlgmac_set_buffer_data(&desc_data->rx.hdr, &ring->rx_hdr_pa,
+ XLGMAC_SKB_ALLOC_SIZE);
+
+ /* Set up the buffer page info */
+ xlgmac_set_buffer_data(&desc_data->rx.buf, &ring->rx_buf_pa,
+ pdata->rx_buf_size);
+
+ return 0;
+}
+
+static void xlgmac_tx_desc_init(struct xlgmac_pdata *pdata)
+{
+ struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
+ struct xlgmac_desc_data *desc_data;
+ struct xlgmac_dma_desc *dma_desc;
+ struct xlgmac_channel *channel;
+ struct xlgmac_ring *ring;
+ dma_addr_t dma_desc_addr;
+ unsigned int i, j;
+
+ channel = pdata->channel_head;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ ring = channel->tx_ring;
+ if (!ring)
+ break;
+
+ dma_desc = ring->dma_desc_head;
+ dma_desc_addr = ring->dma_desc_head_addr;
+
+ for (j = 0; j < ring->dma_desc_count; j++) {
+ desc_data = XLGMAC_GET_DESC_DATA(ring, j);
+
+ desc_data->dma_desc = dma_desc;
+ desc_data->dma_desc_addr = dma_desc_addr;
+
+ dma_desc++;
+ dma_desc_addr += sizeof(struct xlgmac_dma_desc);
+ }
+
+ ring->cur = 0;
+ ring->dirty = 0;
+ memset(&ring->tx, 0, sizeof(ring->tx));
+
+ hw_ops->tx_desc_init(channel);
+ }
+}
+
+static void xlgmac_rx_desc_init(struct xlgmac_pdata *pdata)
+{
+ struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
+ struct xlgmac_desc_data *desc_data;
+ struct xlgmac_dma_desc *dma_desc;
+ struct xlgmac_channel *channel;
+ struct xlgmac_ring *ring;
+ dma_addr_t dma_desc_addr;
+ unsigned int i, j;
+
+ channel = pdata->channel_head;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ ring = channel->rx_ring;
+ if (!ring)
+ break;
+
+ dma_desc = ring->dma_desc_head;
+ dma_desc_addr = ring->dma_desc_head_addr;
+
+ for (j = 0; j < ring->dma_desc_count; j++) {
+ desc_data = XLGMAC_GET_DESC_DATA(ring, j);
+
+ desc_data->dma_desc = dma_desc;
+ desc_data->dma_desc_addr = dma_desc_addr;
+
+ if (xlgmac_map_rx_buffer(pdata, ring, desc_data))
+ break;
+
+ dma_desc++;
+ dma_desc_addr += sizeof(struct xlgmac_dma_desc);
+ }
+
+ ring->cur = 0;
+ ring->dirty = 0;
+
+ hw_ops->rx_desc_init(channel);
+ }
+}
+
+static int xlgmac_map_tx_skb(struct xlgmac_channel *channel,
+ struct sk_buff *skb)
+{
+ struct xlgmac_pdata *pdata = channel->pdata;
+ struct xlgmac_ring *ring = channel->tx_ring;
+ unsigned int start_index, cur_index;
+ struct xlgmac_desc_data *desc_data;
+ unsigned int offset, datalen, len;
+ struct xlgmac_pkt_info *pkt_info;
+ struct skb_frag_struct *frag;
+ unsigned int tso, vlan;
+ dma_addr_t skb_dma;
+ unsigned int i;
+
+ offset = 0;
+ start_index = ring->cur;
+ cur_index = ring->cur;
+
+ pkt_info = &ring->pkt_info;
+ pkt_info->desc_count = 0;
+ pkt_info->length = 0;
+
+ tso = XLGMAC_GET_REG_BITS(pkt_info->attributes,
+ TX_PACKET_ATTRIBUTES_TSO_ENABLE_POS,
+ TX_PACKET_ATTRIBUTES_TSO_ENABLE_LEN);
+ vlan = XLGMAC_GET_REG_BITS(pkt_info->attributes,
+ TX_PACKET_ATTRIBUTES_VLAN_CTAG_POS,
+ TX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN);
+
+ /* Save space for a context descriptor if needed */
+ if ((tso && (pkt_info->mss != ring->tx.cur_mss)) ||
+ (vlan && (pkt_info->vlan_ctag != ring->tx.cur_vlan_ctag)))
+ cur_index++;
+ desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
+
+ if (tso) {
+ /* Map the TSO header */
+ skb_dma = dma_map_single(pdata->dev, skb->data,
+ pkt_info->header_len, DMA_TO_DEVICE);
+ if (dma_mapping_error(pdata->dev, skb_dma)) {
+ netdev_alert(pdata->netdev, "dma_map_single failed\n");
+ goto err_out;
+ }
+ desc_data->skb_dma = skb_dma;
+ desc_data->skb_dma_len = pkt_info->header_len;
+ netif_dbg(pdata, tx_queued, pdata->netdev,
+ "skb header: index=%u, dma=%pad, len=%u\n",
+ cur_index, &skb_dma, pkt_info->header_len);
+
+ offset = pkt_info->header_len;
+
+ pkt_info->length += pkt_info->header_len;
+
+ cur_index++;
+ desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
+ }
+
+ /* Map the (remainder of the) packet */
+ for (datalen = skb_headlen(skb) - offset; datalen; ) {
+ len = min_t(unsigned int, datalen, XLGMAC_TX_MAX_BUF_SIZE);
+
+ skb_dma = dma_map_single(pdata->dev, skb->data + offset, len,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(pdata->dev, skb_dma)) {
+ netdev_alert(pdata->netdev, "dma_map_single failed\n");
+ goto err_out;
+ }
+ desc_data->skb_dma = skb_dma;
+ desc_data->skb_dma_len = len;
+ netif_dbg(pdata, tx_queued, pdata->netdev,
+ "skb data: index=%u, dma=%pad, len=%u\n",
+ cur_index, &skb_dma, len);
+
+ datalen -= len;
+ offset += len;
+
+ pkt_info->length += len;
+
+ cur_index++;
+ desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
+ }
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ netif_dbg(pdata, tx_queued, pdata->netdev,
+ "mapping frag %u\n", i);
+
+ frag = &skb_shinfo(skb)->frags[i];
+ offset = 0;
+
+ for (datalen = skb_frag_size(frag); datalen; ) {
+ len = min_t(unsigned int, datalen,
+ XLGMAC_TX_MAX_BUF_SIZE);
+
+ skb_dma = skb_frag_dma_map(pdata->dev, frag, offset,
+ len, DMA_TO_DEVICE);
+ if (dma_mapping_error(pdata->dev, skb_dma)) {
+ netdev_alert(pdata->netdev,
+ "skb_frag_dma_map failed\n");
+ goto err_out;
+ }
+ desc_data->skb_dma = skb_dma;
+ desc_data->skb_dma_len = len;
+ desc_data->mapped_as_page = 1;
+ netif_dbg(pdata, tx_queued, pdata->netdev,
+ "skb frag: index=%u, dma=%pad, len=%u\n",
+ cur_index, &skb_dma, len);
+
+ datalen -= len;
+ offset += len;
+
+ pkt_info->length += len;
+
+ cur_index++;
+ desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index);
+ }
+ }
+
+ /* Save the skb address in the last entry. We always have some data
+ * that has been mapped so desc_data is always advanced past the last
+ * piece of mapped data - use the entry pointed to by cur_index - 1.
+ */
+ desc_data = XLGMAC_GET_DESC_DATA(ring, cur_index - 1);
+ desc_data->skb = skb;
+
+ /* Save the number of descriptor entries used */
+ pkt_info->desc_count = cur_index - start_index;
+
+ return pkt_info->desc_count;
+
+err_out:
+ while (start_index < cur_index) {
+ desc_data = XLGMAC_GET_DESC_DATA(ring, start_index++);
+ xlgmac_unmap_desc_data(pdata, desc_data);
+ }
+
+ return 0;
+}
+
+void xlgmac_init_desc_ops(struct xlgmac_desc_ops *desc_ops)
+{
+ desc_ops->alloc_channles_and_rings = xlgmac_alloc_channels_and_rings;
+ desc_ops->free_channels_and_rings = xlgmac_free_channels_and_rings;
+ desc_ops->map_tx_skb = xlgmac_map_tx_skb;
+ desc_ops->map_rx_buffer = xlgmac_map_rx_buffer;
+ desc_ops->unmap_desc_data = xlgmac_unmap_desc_data;
+ desc_ops->tx_desc_init = xlgmac_tx_desc_init;
+ desc_ops->rx_desc_init = xlgmac_rx_desc_init;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 02:43:45 +0000