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Message-Id: <1350508512-15562-2-git-send-email-mark.einon@gmail.com>
Date: Wed, 17 Oct 2012 22:15:12 +0100
From: Mark Einon <mark.einon@...il.com>
To: devel@...verdev.osuosl.org, gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org, Mark Einon <mark.einon@...il.com>
Subject: [PATCH 2/2] staging: et131x: Fix 64bit tx dma address handling
The driver checks that the device can handle 64bit DMA addressing in
et131x_pci_setup(), but then assumes that the top dword of a tx dma
address is always zero when creating a dma mapping in nic_send_packet().
Fix the mapping to use the higher dword of the dma_addr_t returned by
dma_map_single() and skb_frag_dma_map().
Also remove incorrect comments stating that dma_map_single() only returns
a 32 bit address.
Signed-off-by: Mark Einon <mark.einon@...il.com>
---
drivers/staging/et131x/et131x.c | 102 +++++++++++++++------------------------
1 file changed, 39 insertions(+), 63 deletions(-)
diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
index f0fe4bd..83643be 100644
--- a/drivers/staging/et131x/et131x.c
+++ b/drivers/staging/et131x/et131x.c
@@ -3285,6 +3285,7 @@ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb)
struct skb_frag_struct *frags = &skb_shinfo(skb)->frags[0];
unsigned long flags;
struct phy_device *phydev = adapter->phydev;
+ dma_addr_t dma_addr;
/* Part of the optimizations of this send routine restrict us to
* sending 24 fragments at a pass. In practice we should never see
@@ -3314,77 +3315,46 @@ static int nic_send_packet(struct et131x_adapter *adapter, struct tcb *tcb)
* doesn't seem to like large fragments.
*/
if (skb_headlen(skb) <= 1514) {
- desc[frag].addr_hi = 0;
/* Low 16bits are length, high is vlan and
unused currently so zero */
desc[frag].len_vlan = skb_headlen(skb);
-
- /* NOTE: Here, the dma_addr_t returned from
- * dma_map_single() is implicitly cast as a
- * u32. Although dma_addr_t can be
- * 64-bit, the address returned by
- * dma_map_single() is always 32-bit
- * addressable (as defined by the pci/dma
- * subsystem)
- */
- desc[frag++].addr_lo =
- dma_map_single(&adapter->pdev->dev,
- skb->data,
- skb_headlen(skb),
- DMA_TO_DEVICE);
+ dma_addr = dma_map_single(&adapter->pdev->dev,
+ skb->data,
+ skb_headlen(skb),
+ DMA_TO_DEVICE);
+ desc[frag].addr_lo = dma_addr & 0xFFFFFFFF;
+ desc[frag].addr_hi = dma_addr >> 32;
+ frag++;
} else {
- desc[frag].addr_hi = 0;
desc[frag].len_vlan = skb_headlen(skb) / 2;
-
- /* NOTE: Here, the dma_addr_t returned from
- * dma_map_single() is implicitly cast as a
- * u32. Although dma_addr_t can be
- * 64-bit, the address returned by
- * dma_map_single() is always 32-bit
- * addressable (as defined by the pci/dma
- * subsystem)
- */
- desc[frag++].addr_lo =
- dma_map_single(&adapter->pdev->dev,
- skb->data,
- (skb_headlen(skb) / 2),
- DMA_TO_DEVICE);
- desc[frag].addr_hi = 0;
+ dma_addr = dma_map_single(&adapter->pdev->dev,
+ skb->data,
+ (skb_headlen(skb) / 2),
+ DMA_TO_DEVICE);
+ desc[frag].addr_lo = dma_addr & 0xFFFFFFFF;
+ desc[frag].addr_hi = dma_addr >> 32;
+ frag++;
desc[frag].len_vlan = skb_headlen(skb) / 2;
-
- /* NOTE: Here, the dma_addr_t returned from
- * dma_map_single() is implicitly cast as a
- * u32. Although dma_addr_t can be
- * 64-bit, the address returned by
- * dma_map_single() is always 32-bit
- * addressable (as defined by the pci/dma
- * subsystem)
- */
- desc[frag++].addr_lo =
- dma_map_single(&adapter->pdev->dev,
- skb->data +
- (skb_headlen(skb) / 2),
- (skb_headlen(skb) / 2),
- DMA_TO_DEVICE);
+ dma_addr = dma_map_single(&adapter->pdev->dev,
+ skb->data +
+ (skb_headlen(skb) / 2),
+ (skb_headlen(skb) / 2),
+ DMA_TO_DEVICE);
+ desc[frag].addr_lo = dma_addr & 0xFFFFFFFF;
+ desc[frag].addr_hi = dma_addr >> 32;
+ frag++;
}
} else {
- desc[frag].addr_hi = 0;
- desc[frag].len_vlan =
- frags[i - 1].size;
-
- /* NOTE: Here, the dma_addr_t returned from
- * dma_map_page() is implicitly cast as a u32.
- * Although dma_addr_t can be 64-bit, the address
- * returned by dma_map_page() is always 32-bit
- * addressable (as defined by the pci/dma subsystem)
- */
- desc[frag++].addr_lo = skb_frag_dma_map(
- &adapter->pdev->dev,
- &frags[i - 1],
- 0,
- frags[i - 1].size,
- DMA_TO_DEVICE);
+ desc[frag].len_vlan = frags[i - 1].size;
+ dma_addr = skb_frag_dma_map(&adapter->pdev->dev,
+ &frags[i - 1],
+ 0,
+ frags[i - 1].size,
+ DMA_TO_DEVICE);
+ desc[frag].addr_lo = dma_addr & 0xFFFFFFFF;
+ desc[frag].addr_hi = dma_addr >> 32;
+ frag++;
}
}
@@ -3611,6 +3581,7 @@ static inline void free_send_packet(struct et131x_adapter *adapter,
unsigned long flags;
struct tx_desc *desc = NULL;
struct net_device_stats *stats = &adapter->net_stats;
+ dma_addr_t dma_addr;
if (tcb->flags & fMP_DEST_BROAD)
atomic_inc(&adapter->stats.broadcast_pkts_xmtd);
@@ -3631,8 +3602,13 @@ static inline void free_send_packet(struct et131x_adapter *adapter,
(adapter->tx_ring.tx_desc_ring +
INDEX10(tcb->index_start));
+ dma_addr = desc->addr_lo;
+
+ if (sizeof(dma_addr_t) == sizeof(u64))
+ dma_addr += ((dma_addr_t)desc->addr_hi) << 32;
+
dma_unmap_single(&adapter->pdev->dev,
- desc->addr_lo,
+ dma_addr,
desc->len_vlan, DMA_TO_DEVICE);
add_10bit(&tcb->index_start, 1);
--
1.7.9.5
--
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