igb: remove use of skb_dma_map from driver

This change removes skb_dma_map/unmap calls from the igb driver due to the
fact that the call is incompatible with iommu enabled kernels.  In order to
prevent warnings about using the wrong unmap call I have added a
mapped_as_page value to the buffer_info structure to track if the mapped
region is a page or a buffer.

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>

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index c458d9b..b1c1eb8 100644 (file)
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -137,12 +137,13 @@ struct igb_buffer {
                        unsigned long time_stamp;
                        u16 length;
                        u16 next_to_watch;
+                       u16 mapped_as_page;
                };
                /* RX */
                struct {
                        struct page *page;
-                       u64 page_dma;
-                       unsigned int page_offset;
+                       dma_addr_t page_dma;
+                       u16 page_offset;
                };
        };
 };

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index bb1a6ee..e57b32d 100644 (file)
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -2654,16 +2654,27 @@ static void igb_free_all_tx_resources(struct igb_adapter *adapter)
 void igb_unmap_and_free_tx_resource(struct igb_ring *tx_ring,
                                    struct igb_buffer *buffer_info)
 {
-       buffer_info->dma = 0;
+       if (buffer_info->dma) {
+               if (buffer_info->mapped_as_page)
+                       pci_unmap_page(tx_ring->pdev,
+                                       buffer_info->dma,
+                                       buffer_info->length,
+                                       PCI_DMA_TODEVICE);
+               else
+                       pci_unmap_single(tx_ring->pdev,
+                                       buffer_info->dma,
+                                       buffer_info->length,
+                                       PCI_DMA_TODEVICE);
+               buffer_info->dma = 0;
+       }
        if (buffer_info->skb) {
-               skb_dma_unmap(&tx_ring->pdev->dev,
-                             buffer_info->skb,
-                             DMA_TO_DEVICE);
                dev_kfree_skb_any(buffer_info->skb);
                buffer_info->skb = NULL;
        }
        buffer_info->time_stamp = 0;
-       /* buffer_info must be completely set up in the transmit path */
+       buffer_info->length = 0;
+       buffer_info->next_to_watch = 0;
+       buffer_info->mapped_as_page = false;
 }
 
 /**
@@ -3561,24 +3572,19 @@ static inline int igb_tx_map_adv(struct igb_ring *tx_ring, struct sk_buff *skb,
        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(&pdev->dev, skb, DMA_TO_DEVICE)) {
-               dev_err(&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 >= IGB_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;
@@ -3595,7 +3601,15 @@ static inline int igb_tx_map_adv(struct igb_ring *tx_ring, struct sk_buff *skb,
                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++;
        }
 
@@ -3603,6 +3617,29 @@ static inline int igb_tx_map_adv(struct igb_ring *tx_ring, struct sk_buff *skb,
        tx_ring->buffer_info[first].next_to_watch = i;
 
        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];
+               igb_unmap_and_free_tx_resource(tx_ring, buffer_info);
+       }
+
+       return 0;
 }
 
 static inline void igb_tx_queue_adv(struct igb_ring *tx_ring,
@@ -3755,7 +3792,7 @@ netdev_tx_t igb_xmit_frame_ring_adv(struct sk_buff *skb,
         * has occured and we need to rewind the descriptor queue
         */
        count = igb_tx_map_adv(tx_ring, skb, first);
-       if (count <= 0) {
+       if (!count) {
                dev_kfree_skb_any(skb);
                tx_ring->buffer_info[first].time_stamp = 0;
                tx_ring->next_to_use = first;