bnx2: remove skb_dma_map/unmap calls from driver

Due to the fact that skb_dma_map/unmap do not work correctly when a HW
IOMMU is enabled it has been recommended to go about removing the calls
from the network device drivers.

[ Fix bnx2_free_tx_skbs() ring indexing and use NETDEV_TX_OK return
  code in bnx2_start_xmit() after cleaning up DMA mapping errors. -Mchan ]

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Michael Chan <mchan@broadcom.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/bnx2.c b/drivers/net/bnx2.c
index 539d23b..f47bf50 100644 (file)
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -2815,13 +2815,21 @@ bnx2_tx_int(struct bnx2 *bp, struct bnx2_napi *bnapi, int budget)
                        }
                }
 
-               skb_dma_unmap(&bp->pdev->dev, skb, DMA_TO_DEVICE);
+               pci_unmap_single(bp->pdev, pci_unmap_addr(tx_buf, mapping),
+                       skb_headlen(skb), PCI_DMA_TODEVICE);
 
                tx_buf->skb = NULL;
                last = tx_buf->nr_frags;
 
                for (i = 0; i < last; i++) {
                        sw_cons = NEXT_TX_BD(sw_cons);
+
+                       pci_unmap_page(bp->pdev,
+                               pci_unmap_addr(
+                                       &txr->tx_buf_ring[TX_RING_IDX(sw_cons)],
+                                       mapping),
+                               skb_shinfo(skb)->frags[i].size,
+                               PCI_DMA_TODEVICE);
                }
 
                sw_cons = NEXT_TX_BD(sw_cons);
@@ -5295,17 +5303,29 @@ bnx2_free_tx_skbs(struct bnx2 *bp)
                for (j = 0; j < TX_DESC_CNT; ) {
                        struct sw_tx_bd *tx_buf = &txr->tx_buf_ring[j];
                        struct sk_buff *skb = tx_buf->skb;
+                       int k, last;
 
                        if (skb == NULL) {
                                j++;
                                continue;
                        }
 
-                       skb_dma_unmap(&bp->pdev->dev, skb, DMA_TO_DEVICE);
+                       pci_unmap_single(bp->pdev,
+                                        pci_unmap_addr(tx_buf, mapping),
+                                        skb_headlen(skb),
+                                        PCI_DMA_TODEVICE);
 
                        tx_buf->skb = NULL;
 
-                       j += skb_shinfo(skb)->nr_frags + 1;
+                       last = tx_buf->nr_frags;
+                       j++;
+                       for (k = 0; k < last; k++, j++) {
+                               tx_buf = &txr->tx_buf_ring[TX_RING_IDX(j)];
+                               pci_unmap_page(bp->pdev,
+                                       pci_unmap_addr(tx_buf, mapping),
+                                       skb_shinfo(skb)->frags[k].size,
+                                       PCI_DMA_TODEVICE);
+                       }
                        dev_kfree_skb(skb);
                }
        }
@@ -5684,11 +5704,12 @@ bnx2_run_loopback(struct bnx2 *bp, int loopback_mode)
        for (i = 14; i < pkt_size; i++)
                packet[i] = (unsigned char) (i & 0xff);
 
-       if (skb_dma_map(&bp->pdev->dev, skb, DMA_TO_DEVICE)) {
+       map = pci_map_single(bp->pdev, skb->data, pkt_size,
+               PCI_DMA_TODEVICE);
+       if (pci_dma_mapping_error(bp->pdev, map)) {
                dev_kfree_skb(skb);
                return -EIO;
        }
-       map = skb_shinfo(skb)->dma_head;
 
        REG_WR(bp, BNX2_HC_COMMAND,
               bp->hc_cmd | BNX2_HC_COMMAND_COAL_NOW_WO_INT);
@@ -5723,7 +5744,7 @@ bnx2_run_loopback(struct bnx2 *bp, int loopback_mode)
 
        udelay(5);
 
-       skb_dma_unmap(&bp->pdev->dev, skb, DMA_TO_DEVICE);
+       pci_unmap_single(bp->pdev, map, pkt_size, PCI_DMA_TODEVICE);
        dev_kfree_skb(skb);
 
        if (bnx2_get_hw_tx_cons(tx_napi) != txr->tx_prod)
@@ -6302,7 +6323,6 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
        struct bnx2_napi *bnapi;
        struct bnx2_tx_ring_info *txr;
        struct netdev_queue *txq;
-       struct skb_shared_info *sp;
 
        /*  Determine which tx ring we will be placed on */
        i = skb_get_queue_mapping(skb);
@@ -6367,16 +6387,15 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
        } else
                mss = 0;
 
-       if (skb_dma_map(&bp->pdev->dev, skb, DMA_TO_DEVICE)) {
+       mapping = pci_map_single(bp->pdev, skb->data, len, PCI_DMA_TODEVICE);
+       if (pci_dma_mapping_error(bp->pdev, mapping)) {
                dev_kfree_skb(skb);
                return NETDEV_TX_OK;
        }
 
-       sp = skb_shinfo(skb);
-       mapping = sp->dma_head;
-
        tx_buf = &txr->tx_buf_ring[ring_prod];
        tx_buf->skb = skb;
+       pci_unmap_addr_set(tx_buf, mapping, mapping);
 
        txbd = &txr->tx_desc_ring[ring_prod];
 
@@ -6397,7 +6416,12 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
                txbd = &txr->tx_desc_ring[ring_prod];
 
                len = frag->size;
-               mapping = sp->dma_maps[i];
+               mapping = pci_map_page(bp->pdev, frag->page, frag->page_offset,
+                       len, PCI_DMA_TODEVICE);
+               if (pci_dma_mapping_error(bp->pdev, mapping))
+                       goto dma_error;
+               pci_unmap_addr_set(&txr->tx_buf_ring[ring_prod], mapping,
+                                  mapping);
 
                txbd->tx_bd_haddr_hi = (u64) mapping >> 32;
                txbd->tx_bd_haddr_lo = (u64) mapping & 0xffffffff;
@@ -6423,6 +6447,30 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
                        netif_tx_wake_queue(txq);
        }
 
+       return NETDEV_TX_OK;
+dma_error:
+       /* save value of frag that failed */
+       last_frag = i;
+
+       /* start back at beginning and unmap skb */
+       prod = txr->tx_prod;
+       ring_prod = TX_RING_IDX(prod);
+       tx_buf = &txr->tx_buf_ring[ring_prod];
+       tx_buf->skb = NULL;
+       pci_unmap_single(bp->pdev, pci_unmap_addr(tx_buf, mapping),
+                        skb_headlen(skb), PCI_DMA_TODEVICE);
+
+       /* unmap remaining mapped pages */
+       for (i = 0; i < last_frag; i++) {
+               prod = NEXT_TX_BD(prod);
+               ring_prod = TX_RING_IDX(prod);
+               tx_buf = &txr->tx_buf_ring[ring_prod];
+               pci_unmap_page(bp->pdev, pci_unmap_addr(tx_buf, mapping),
+                              skb_shinfo(skb)->frags[i].size,
+                              PCI_DMA_TODEVICE);
+       }
+
+       dev_kfree_skb(skb);
        return NETDEV_TX_OK;
 }
 

diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index a4d8340..4908b9f 100644 (file)
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -6559,6 +6559,7 @@ struct sw_pg {
 
 struct sw_tx_bd {
        struct sk_buff          *skb;
+       DECLARE_PCI_UNMAP_ADDR(mapping)
        unsigned short          is_gso;
        unsigned short          nr_frags;
 };