From 6366ad331f436388129dfc044db871de79604e4d Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Wed, 2 Dec 2009 16:47:18 +0000 Subject: [PATCH] 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 Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/igb/igb.h | 5 +-- drivers/net/igb/igb_main.c | 69 +++++++++++++++++++++++++++++--------- 2 files changed, 56 insertions(+), 18 deletions(-) diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h index c458d9b188ba..b1c1eb88893f 100644 --- 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 bb1a6eeade06..e57b32d3fde4 100644 --- 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; -- 2.20.1