--- /dev/null
+/*
+ * AMD 10Gb Ethernet driver
+ *
+ * This file is available to you under your choice of the following two
+ * licenses:
+ *
+ * License 1: GPLv2
+ *
+ * Copyright (c) 2014 Advanced Micro Devices, Inc.
+ *
+ * This file is free software; you may copy, redistribute and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ * The Synopsys DWC ETHER XGMAC Software Driver and documentation
+ * (hereinafter "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 Licensed Product
+ * under any End User Software License Agreement or Agreement for Licensed
+ * Product with Synopsys or any supplement thereto. Permission is hereby
+ * granted, free of charge, to any person obtaining a copy of this software
+ * annotated with this license and the Software, to deal in the Software
+ * without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
+ * BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *
+ * License 2: Modified BSD
+ *
+ * Copyright (c) 2014 Advanced Micro Devices, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Advanced Micro Devices, Inc. nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ * The Synopsys DWC ETHER XGMAC Software Driver and documentation
+ * (hereinafter "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 Licensed Product
+ * under any End User Software License Agreement or Agreement for Licensed
+ * Product with Synopsys or any supplement thereto. Permission is hereby
+ * granted, free of charge, to any person obtaining a copy of this software
+ * annotated with this license and the Software, to deal in the Software
+ * without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
+ * BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "xgbe.h"
+#include "xgbe-common.h"
+
+static void xgbe_unmap_rdata(struct xgbe_prv_data *, struct xgbe_ring_data *);
+
+static void xgbe_free_ring(struct xgbe_prv_data *pdata,
+ struct xgbe_ring *ring)
+{
+ struct xgbe_ring_data *rdata;
+ unsigned int i;
+
+ if (!ring)
+ return;
+
+ if (ring->rdata) {
+ for (i = 0; i < ring->rdesc_count; i++) {
+ rdata = XGBE_GET_DESC_DATA(ring, i);
+ xgbe_unmap_rdata(pdata, rdata);
+ }
+
+ kfree(ring->rdata);
+ ring->rdata = 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->rdesc) {
+ dma_free_coherent(pdata->dev,
+ (sizeof(struct xgbe_ring_desc) *
+ ring->rdesc_count),
+ ring->rdesc, ring->rdesc_dma);
+ ring->rdesc = NULL;
+ }
+}
+
+static void xgbe_free_ring_resources(struct xgbe_prv_data *pdata)
+{
+ struct xgbe_channel *channel;
+ unsigned int i;
+
+ DBGPR("-->xgbe_free_ring_resources\n");
+
+ channel = pdata->channel;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ xgbe_free_ring(pdata, channel->tx_ring);
+ xgbe_free_ring(pdata, channel->rx_ring);
+ }
+
+ DBGPR("<--xgbe_free_ring_resources\n");
+}
+
+static int xgbe_init_ring(struct xgbe_prv_data *pdata,
+ struct xgbe_ring *ring, unsigned int rdesc_count)
+{
+ DBGPR("-->xgbe_init_ring\n");
+
+ if (!ring)
+ return 0;
+
+ /* Descriptors */
+ ring->rdesc_count = rdesc_count;
+ ring->rdesc = dma_alloc_coherent(pdata->dev,
+ (sizeof(struct xgbe_ring_desc) *
+ rdesc_count), &ring->rdesc_dma,
+ GFP_KERNEL);
+ if (!ring->rdesc)
+ return -ENOMEM;
+
+ /* Descriptor information */
+ ring->rdata = kcalloc(rdesc_count, sizeof(struct xgbe_ring_data),
+ GFP_KERNEL);
+ if (!ring->rdata)
+ return -ENOMEM;
+
+ DBGPR(" rdesc=0x%p, rdesc_dma=0x%llx, rdata=0x%p\n",
+ ring->rdesc, ring->rdesc_dma, ring->rdata);
+
+ DBGPR("<--xgbe_init_ring\n");
+
+ return 0;
+}
+
+static int xgbe_alloc_ring_resources(struct xgbe_prv_data *pdata)
+{
+ struct xgbe_channel *channel;
+ unsigned int i;
+ int ret;
+
+ DBGPR("-->xgbe_alloc_ring_resources\n");
+
+ channel = pdata->channel;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ DBGPR(" %s - tx_ring:\n", channel->name);
+ ret = xgbe_init_ring(pdata, channel->tx_ring,
+ pdata->tx_desc_count);
+ if (ret) {
+ netdev_alert(pdata->netdev,
+ "error initializing Tx ring\n");
+ goto err_ring;
+ }
+
+ DBGPR(" %s - rx_ring:\n", channel->name);
+ ret = xgbe_init_ring(pdata, channel->rx_ring,
+ pdata->rx_desc_count);
+ if (ret) {
+ netdev_alert(pdata->netdev,
+ "error initializing Tx ring\n");
+ goto err_ring;
+ }
+ }
+
+ DBGPR("<--xgbe_alloc_ring_resources\n");
+
+ return 0;
+
+err_ring:
+ xgbe_free_ring_resources(pdata);
+
+ return ret;
+}
+
+static int xgbe_alloc_pages(struct xgbe_prv_data *pdata,
+ struct xgbe_page_alloc *pa, gfp_t gfp, int order)
+{
+ struct page *pages = NULL;
+ dma_addr_t pages_dma;
+ int ret;
+
+ /* 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);
+ ret = dma_mapping_error(pdata->dev, pages_dma);
+ if (ret) {
+ put_page(pages);
+ return ret;
+ }
+
+ pa->pages = pages;
+ pa->pages_len = PAGE_SIZE << order;
+ pa->pages_offset = 0;
+ pa->pages_dma = pages_dma;
+
+ return 0;
+}
+
+static void xgbe_set_buffer_data(struct xgbe_buffer_data *bd,
+ struct xgbe_page_alloc *pa,
+ unsigned int len)
+{
+ get_page(pa->pages);
+ bd->pa = *pa;
+
+ bd->dma = pa->pages_dma + 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 xgbe_map_rx_buffer(struct xgbe_prv_data *pdata,
+ struct xgbe_ring *ring,
+ struct xgbe_ring_data *rdata)
+{
+ int order, ret;
+
+ if (!ring->rx_hdr_pa.pages) {
+ ret = xgbe_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 = xgbe_alloc_pages(pdata, &ring->rx_buf_pa, GFP_ATOMIC,
+ order);
+ if (ret)
+ return ret;
+ }
+
+ /* Set up the header page info */
+ xgbe_set_buffer_data(&rdata->rx.hdr, &ring->rx_hdr_pa,
+ XGBE_SKB_ALLOC_SIZE);
+
+ /* Set up the buffer page info */
+ xgbe_set_buffer_data(&rdata->rx.buf, &ring->rx_buf_pa,
+ pdata->rx_buf_size);
+
+ return 0;
+}
+
+static void xgbe_wrapper_tx_descriptor_init(struct xgbe_prv_data *pdata)
+{
+ struct xgbe_hw_if *hw_if = &pdata->hw_if;
+ struct xgbe_channel *channel;
+ struct xgbe_ring *ring;
+ struct xgbe_ring_data *rdata;
+ struct xgbe_ring_desc *rdesc;
+ dma_addr_t rdesc_dma;
+ unsigned int i, j;
+
+ DBGPR("-->xgbe_wrapper_tx_descriptor_init\n");
+
+ channel = pdata->channel;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ ring = channel->tx_ring;
+ if (!ring)
+ break;
+
+ rdesc = ring->rdesc;
+ rdesc_dma = ring->rdesc_dma;
+
+ for (j = 0; j < ring->rdesc_count; j++) {
+ rdata = XGBE_GET_DESC_DATA(ring, j);
+
+ rdata->rdesc = rdesc;
+ rdata->rdesc_dma = rdesc_dma;
+
+ rdesc++;
+ rdesc_dma += sizeof(struct xgbe_ring_desc);
+ }
+
+ ring->cur = 0;
+ ring->dirty = 0;
+ memset(&ring->tx, 0, sizeof(ring->tx));
+
+ hw_if->tx_desc_init(channel);
+ }
+
+ DBGPR("<--xgbe_wrapper_tx_descriptor_init\n");
+}
+
+static void xgbe_wrapper_rx_descriptor_init(struct xgbe_prv_data *pdata)
+{
+ struct xgbe_hw_if *hw_if = &pdata->hw_if;
+ struct xgbe_channel *channel;
+ struct xgbe_ring *ring;
+ struct xgbe_ring_desc *rdesc;
+ struct xgbe_ring_data *rdata;
+ dma_addr_t rdesc_dma;
+ unsigned int i, j;
+
+ DBGPR("-->xgbe_wrapper_rx_descriptor_init\n");
+
+ channel = pdata->channel;
+ for (i = 0; i < pdata->channel_count; i++, channel++) {
+ ring = channel->rx_ring;
+ if (!ring)
+ break;
+
+ rdesc = ring->rdesc;
+ rdesc_dma = ring->rdesc_dma;
+
+ for (j = 0; j < ring->rdesc_count; j++) {
+ rdata = XGBE_GET_DESC_DATA(ring, j);
+
+ rdata->rdesc = rdesc;
+ rdata->rdesc_dma = rdesc_dma;
+
+ if (xgbe_map_rx_buffer(pdata, ring, rdata))
+ break;
+
+ rdesc++;
+ rdesc_dma += sizeof(struct xgbe_ring_desc);
+ }
+
+ ring->cur = 0;
+ ring->dirty = 0;
+
+ hw_if->rx_desc_init(channel);
+ }
+
+ DBGPR("<--xgbe_wrapper_rx_descriptor_init\n");
+}
+
+static void xgbe_unmap_rdata(struct xgbe_prv_data *pdata,
+ struct xgbe_ring_data *rdata)
+{
+ if (rdata->skb_dma) {
+ if (rdata->mapped_as_page) {
+ dma_unmap_page(pdata->dev, rdata->skb_dma,
+ rdata->skb_dma_len, DMA_TO_DEVICE);
+ } else {
+ dma_unmap_single(pdata->dev, rdata->skb_dma,
+ rdata->skb_dma_len, DMA_TO_DEVICE);
+ }
+ rdata->skb_dma = 0;
+ rdata->skb_dma_len = 0;
+ }
+
+ if (rdata->skb) {
+ dev_kfree_skb_any(rdata->skb);
+ rdata->skb = NULL;
+ }
+
+ if (rdata->rx.hdr.pa.pages)
+ put_page(rdata->rx.hdr.pa.pages);
+
+ if (rdata->rx.hdr.pa_unmap.pages) {
+ dma_unmap_page(pdata->dev, rdata->rx.hdr.pa_unmap.pages_dma,
+ rdata->rx.hdr.pa_unmap.pages_len,
+ DMA_FROM_DEVICE);
+ put_page(rdata->rx.hdr.pa_unmap.pages);
+ }
+
+ if (rdata->rx.buf.pa.pages)
+ put_page(rdata->rx.buf.pa.pages);
+
+ if (rdata->rx.buf.pa_unmap.pages) {
+ dma_unmap_page(pdata->dev, rdata->rx.buf.pa_unmap.pages_dma,
+ rdata->rx.buf.pa_unmap.pages_len,
+ DMA_FROM_DEVICE);
+ put_page(rdata->rx.buf.pa_unmap.pages);
+ }
+
+ memset(&rdata->tx, 0, sizeof(rdata->tx));
+ memset(&rdata->rx, 0, sizeof(rdata->rx));
+
+ rdata->mapped_as_page = 0;
+
+ if (rdata->state_saved) {
+ rdata->state_saved = 0;
+ rdata->state.incomplete = 0;
+ rdata->state.context_next = 0;
+ rdata->state.skb = NULL;
+ rdata->state.len = 0;
+ rdata->state.error = 0;
+ }
+}
+
+static int xgbe_map_tx_skb(struct xgbe_channel *channel, struct sk_buff *skb)
+{
+ struct xgbe_prv_data *pdata = channel->pdata;
+ struct xgbe_ring *ring = channel->tx_ring;
+ struct xgbe_ring_data *rdata;
+ struct xgbe_packet_data *packet;
+ struct skb_frag_struct *frag;
+ dma_addr_t skb_dma;
+ unsigned int start_index, cur_index;
+ unsigned int offset, tso, vlan, datalen, len;
+ unsigned int i;
+
+ DBGPR("-->xgbe_map_tx_skb: cur = %d\n", ring->cur);
+
+ offset = 0;
+ start_index = ring->cur;
+ cur_index = ring->cur;
+
+ packet = &ring->packet_data;
+ packet->rdesc_count = 0;
+ packet->length = 0;
+
+ tso = XGMAC_GET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES,
+ TSO_ENABLE);
+ vlan = XGMAC_GET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES,
+ VLAN_CTAG);
+
+ /* Save space for a context descriptor if needed */
+ if ((tso && (packet->mss != ring->tx.cur_mss)) ||
+ (vlan && (packet->vlan_ctag != ring->tx.cur_vlan_ctag)))
+ cur_index++;
+ rdata = XGBE_GET_DESC_DATA(ring, cur_index);
+
+ if (tso) {
+ DBGPR(" TSO packet\n");
+
+ /* Map the TSO header */
+ skb_dma = dma_map_single(pdata->dev, skb->data,
+ packet->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;
+ }
+ rdata->skb_dma = skb_dma;
+ rdata->skb_dma_len = packet->header_len;
+
+ offset = packet->header_len;
+
+ packet->length += packet->header_len;
+
+ cur_index++;
+ rdata = XGBE_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, XGBE_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;
+ }
+ rdata->skb_dma = skb_dma;
+ rdata->skb_dma_len = len;
+ DBGPR(" skb data: index=%u, dma=0x%llx, len=%u\n",
+ cur_index, skb_dma, len);
+
+ datalen -= len;
+ offset += len;
+
+ packet->length += len;
+
+ cur_index++;
+ rdata = XGBE_GET_DESC_DATA(ring, cur_index);
+ }
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ DBGPR(" 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,
+ XGBE_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;
+ }
+ rdata->skb_dma = skb_dma;
+ rdata->skb_dma_len = len;
+ rdata->mapped_as_page = 1;
+ DBGPR(" skb data: index=%u, dma=0x%llx, len=%u\n",
+ cur_index, skb_dma, len);
+
+ datalen -= len;
+ offset += len;
+
+ packet->length += len;
+
+ cur_index++;
+ rdata = XGBE_GET_DESC_DATA(ring, cur_index);
+ }
+ }
+
+ /* Save the skb address in the last entry. We always have some data
+ * that has been mapped so rdata is always advanced past the last
+ * piece of mapped data - use the entry pointed to by cur_index - 1.
+ */
+ rdata = XGBE_GET_DESC_DATA(ring, cur_index - 1);
+ rdata->skb = skb;
+
+ /* Save the number of descriptor entries used */
+ packet->rdesc_count = cur_index - start_index;
+
+ DBGPR("<--xgbe_map_tx_skb: count=%u\n", packet->rdesc_count);
+
+ return packet->rdesc_count;
+
+err_out:
+ while (start_index < cur_index) {
+ rdata = XGBE_GET_DESC_DATA(ring, start_index++);
+ xgbe_unmap_rdata(pdata, rdata);
+ }
+
+ DBGPR("<--xgbe_map_tx_skb: count=0\n");
+
+ return 0;
+}
+
+void xgbe_init_function_ptrs_desc(struct xgbe_desc_if *desc_if)
+{
+ DBGPR("-->xgbe_init_function_ptrs_desc\n");
+
+ desc_if->alloc_ring_resources = xgbe_alloc_ring_resources;
+ desc_if->free_ring_resources = xgbe_free_ring_resources;
+ desc_if->map_tx_skb = xgbe_map_tx_skb;
+ desc_if->map_rx_buffer = xgbe_map_rx_buffer;
+ desc_if->unmap_rdata = xgbe_unmap_rdata;
+ desc_if->wrapper_tx_desc_init = xgbe_wrapper_tx_descriptor_init;
+ desc_if->wrapper_rx_desc_init = xgbe_wrapper_rx_descriptor_init;
+
+ DBGPR("<--xgbe_init_function_ptrs_desc\n");
+}
Code Review / kvmfornfv.git / blobdiff