igbvf: remove skb_dma_map/unmap call from drivers

This patch removes the skb_dma_map/unmap calls from the igbvf driver due to
the fact that it does not play well with HW IOMMU when combined with
transmitting cloned skbs.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 52 insertions, 14 deletions

diff --git a/drivers/net/igbvf/igbvf.h b/drivers/net/igbvf/igbvf.h
index 8e9b67ebbf8b..3d1ee7a8478e 100644
--- a/drivers/net/igbvf/igbvf.h
+++ b/drivers/net/igbvf/igbvf.h
@@ -117,6 +117,7 @@ struct igbvf_buffer {
                         unsigned long time_stamp;
                         u16 length;
                         u16 next_to_watch;
+                        u16 mapped_as_page;
                 };
                 /* Rx */
                 struct {
diff --git a/drivers/net/igbvf/netdev.c b/drivers/net/igbvf/netdev.c
index e01f44597a26..cf26f92e3235 100644
--- a/drivers/net/igbvf/netdev.c
+++ b/drivers/net/igbvf/netdev.c
@@ -366,10 +366,20 @@ next_desc:
 static void igbvf_put_txbuf(struct igbvf_adapter *adapter,
                             struct igbvf_buffer *buffer_info)
 {
-        buffer_info->dma = 0;
+        if (buffer_info->dma) {
+                if (buffer_info->mapped_as_page)
+                        pci_unmap_page(adapter->pdev,
+                                       buffer_info->dma,
+                                       buffer_info->length,
+                                       PCI_DMA_TODEVICE);
+                else
+                        pci_unmap_single(adapter->pdev,
+                                         buffer_info->dma,
+                                         buffer_info->length,
+                                         PCI_DMA_TODEVICE);
+                buffer_info->dma = 0;
+        }
         if (buffer_info->skb) {
-                skb_dma_unmap(&adapter->pdev->dev, buffer_info->skb,
-                              DMA_TO_DEVICE);
                 dev_kfree_skb_any(buffer_info->skb);
                 buffer_info->skb = NULL;
         }
@@ -2088,27 +2098,24 @@ static inline int igbvf_tx_map_adv(struct igbvf_adapter *adapter,
                                    unsigned int first)
 {
         struct igbvf_buffer *buffer_info;
+        struct pci_dev *pdev = adapter->pdev;
         unsigned int len = skb_headlen(skb);
         unsigned int count = 0, i;
         unsigned int f;
-        dma_addr_t *map;
 
         i = tx_ring->next_to_use;
 
-        if (skb_dma_map(&adapter->pdev->dev, skb, DMA_TO_DEVICE)) {
-                dev_err(&adapter->pdev->dev, "TX DMA map failed\n");
-                return 0;
-        }
-
-        map = skb_shinfo(skb)->dma_maps;
-
         buffer_info = &tx_ring->buffer_info[i];
         BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
         buffer_info->length = len;
         /* set time_stamp *before* dma to help avoid a possible race */
         buffer_info->time_stamp = jiffies;
         buffer_info->next_to_watch = i;
-        buffer_info->dma = skb_shinfo(skb)->dma_head;
+        buffer_info->dma = pci_map_single(pdev, skb->data, len,
+                                          PCI_DMA_TODEVICE);
+        if (pci_dma_mapping_error(pdev, buffer_info->dma))
+                goto dma_error;
+
 
         for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
                 struct skb_frag_struct *frag;
@@ -2125,14 +2132,44 @@ static inline int igbvf_tx_map_adv(struct igbvf_adapter *adapter,
                 buffer_info->length = len;
                 buffer_info->time_stamp = jiffies;
                 buffer_info->next_to_watch = i;
-                buffer_info->dma = map[count];
+                buffer_info->mapped_as_page = true;
+                buffer_info->dma = pci_map_page(pdev,
+                                                frag->page,
+                                                frag->page_offset,
+                                                len,
+                                                PCI_DMA_TODEVICE);
+                if (pci_dma_mapping_error(pdev, buffer_info->dma))
+                        goto dma_error;
                 count++;
         }
 
         tx_ring->buffer_info[i].skb = skb;
         tx_ring->buffer_info[first].next_to_watch = i;
 
-        return count + 1;
+        return ++count;
+
+dma_error:
+        dev_err(&pdev->dev, "TX DMA map failed\n");
+
+        /* clear timestamp and dma mappings for failed buffer_info mapping */
+        buffer_info->dma = 0;
+        buffer_info->time_stamp = 0;
+        buffer_info->length = 0;
+        buffer_info->next_to_watch = 0;
+        buffer_info->mapped_as_page = false;
+        count--;
+
+        /* clear timestamp and dma mappings for remaining portion of packet */
+        while (count >= 0) {
+                count--;
+                i--;
+                if (i < 0)
+                        i += tx_ring->count;
+                buffer_info = &tx_ring->buffer_info[i];
+                igbvf_put_txbuf(adapter, buffer_info);
+        }
+
+        return 0;
 }
 
 static inline void igbvf_tx_queue_adv(struct igbvf_adapter *adapter,