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Date: Wed, 02 Dec 2009 18:47:57 -0800
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, gospo@...hat.com,
Alexander Duyck <alexander.h.duyck@...el.com>,
Michael Chan <mchan@...adcom.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next-2.6 PATCH 07/10] bnx2: remove skb_dma_map/unmap calls from
driver
From: Alexander Duyck <alexander.h.duyck@...el.com>
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@...el.com>
Signed-off-by: Michael Chan <mchan@...adcom.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/bnx2.c | 72 +++++++++++++++++++++++++++++++++++++++++++---------
drivers/net/bnx2.h | 1 +
2 files changed, 61 insertions(+), 12 deletions(-)
diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index 539d23b..f47bf50 100644
--- 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;
@@ -6424,6 +6448,30 @@ bnx2_start_xmit(struct sk_buff *skb, struct net_device *dev)
}
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;
}
/* Called with rtnl_lock */
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index a4d8340..4908b9f 100644
--- 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;
};
--
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