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authorAl Viro <viro@ftp.linux.org.uk>2007-12-16 23:30:08 +0000
committerDavid S. Miller <davem@davemloft.net>2008-01-28 15:07:09 -0800
commitf3ec33e587df02e25963755989cc473e3f07bf0d (patch)
tree5f176f664af9b9b8ad76ca5fdfd8fd68de6a1fe5
parentb710b43c306650261c01ad08100791afec78a7db (diff)
sunhme endianness annotations
This one is interesting - SBUS and PCI variants have opposite endianness in descriptors (SBUS is sparc-only, so there host-endian == big-endian). Solution: declare a bitwise type (hme32) and in accessor helpers do typechecking and force-casts (once we know that the type is right). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jeff Garzik <jeff@garzik.org>
-rw-r--r--drivers/net/sunhme.c49
-rw-r--r--drivers/net/sunhme.h12
2 files changed, 33 insertions, 28 deletions
diff --git a/drivers/net/sunhme.c b/drivers/net/sunhme.c
index 9cc13dd8a82..25ce26a882d 100644
--- a/drivers/net/sunhme.c
+++ b/drivers/net/sunhme.c
@@ -194,21 +194,21 @@ static u32 sbus_hme_read32(void __iomem *reg)
static void sbus_hme_write_rxd(struct happy_meal_rxd *rxd, u32 flags, u32 addr)
{
- rxd->rx_addr = addr;
+ rxd->rx_addr = (__force hme32)addr;
wmb();
- rxd->rx_flags = flags;
+ rxd->rx_flags = (__force hme32)flags;
}
static void sbus_hme_write_txd(struct happy_meal_txd *txd, u32 flags, u32 addr)
{
- txd->tx_addr = addr;
+ txd->tx_addr = (__force hme32)addr;
wmb();
- txd->tx_flags = flags;
+ txd->tx_flags = (__force hme32)flags;
}
-static u32 sbus_hme_read_desc32(u32 *p)
+static u32 sbus_hme_read_desc32(hme32 *p)
{
- return *p;
+ return (__force u32)*p;
}
static void pci_hme_write32(void __iomem *reg, u32 val)
@@ -223,21 +223,21 @@ static u32 pci_hme_read32(void __iomem *reg)
static void pci_hme_write_rxd(struct happy_meal_rxd *rxd, u32 flags, u32 addr)
{
- rxd->rx_addr = cpu_to_le32(addr);
+ rxd->rx_addr = (__force hme32)cpu_to_le32(addr);
wmb();
- rxd->rx_flags = cpu_to_le32(flags);
+ rxd->rx_flags = (__force hme32)cpu_to_le32(flags);
}
static void pci_hme_write_txd(struct happy_meal_txd *txd, u32 flags, u32 addr)
{
- txd->tx_addr = cpu_to_le32(addr);
+ txd->tx_addr = (__force hme32)cpu_to_le32(addr);
wmb();
- txd->tx_flags = cpu_to_le32(flags);
+ txd->tx_flags = (__force hme32)cpu_to_le32(flags);
}
-static u32 pci_hme_read_desc32(u32 *p)
+static u32 pci_hme_read_desc32(hme32 *p)
{
- return cpu_to_le32p(p);
+ return le32_to_cpup((__le32 *)p);
}
#define hme_write32(__hp, __reg, __val) \
@@ -266,16 +266,16 @@ static u32 pci_hme_read_desc32(u32 *p)
#define hme_read32(__hp, __reg) \
sbus_readl(__reg)
#define hme_write_rxd(__hp, __rxd, __flags, __addr) \
-do { (__rxd)->rx_addr = (__addr); \
+do { (__rxd)->rx_addr = (__force hme32)(u32)(__addr); \
wmb(); \
- (__rxd)->rx_flags = (__flags); \
+ (__rxd)->rx_flags = (__force hme32)(u32)(__flags); \
} while(0)
#define hme_write_txd(__hp, __txd, __flags, __addr) \
-do { (__txd)->tx_addr = (__addr); \
+do { (__txd)->tx_addr = (__force hme32)(u32)(__addr); \
wmb(); \
- (__txd)->tx_flags = (__flags); \
+ (__txd)->tx_flags = (__force hme32)(u32)(__flags); \
} while(0)
-#define hme_read_desc32(__hp, __p) (*(__p))
+#define hme_read_desc32(__hp, __p) ((__force u32)(hme32)*(__p))
#define hme_dma_map(__hp, __ptr, __size, __dir) \
sbus_map_single((__hp)->happy_dev, (__ptr), (__size), (__dir))
#define hme_dma_unmap(__hp, __addr, __size, __dir) \
@@ -291,16 +291,19 @@ do { (__txd)->tx_addr = (__addr); \
#define hme_read32(__hp, __reg) \
readl(__reg)
#define hme_write_rxd(__hp, __rxd, __flags, __addr) \
-do { (__rxd)->rx_addr = cpu_to_le32(__addr); \
+do { (__rxd)->rx_addr = (__force hme32)cpu_to_le32(__addr); \
wmb(); \
- (__rxd)->rx_flags = cpu_to_le32(__flags); \
+ (__rxd)->rx_flags = (__force hme32)cpu_to_le32(__flags); \
} while(0)
#define hme_write_txd(__hp, __txd, __flags, __addr) \
-do { (__txd)->tx_addr = cpu_to_le32(__addr); \
+do { (__txd)->tx_addr = (__force hme32)cpu_to_le32(__addr); \
wmb(); \
- (__txd)->tx_flags = cpu_to_le32(__flags); \
+ (__txd)->tx_flags = (__force hme32)cpu_to_le32(__flags); \
} while(0)
-#define hme_read_desc32(__hp, __p) cpu_to_le32p(__p)
+static inline u32 hme_read_desc32(struct happy_meal *hp, hme32 *p)
+{
+ return le32_to_cpup((__le32 *)p);
+}
#define hme_dma_map(__hp, __ptr, __size, __dir) \
pci_map_single((__hp)->happy_dev, (__ptr), (__size), (__dir))
#define hme_dma_unmap(__hp, __addr, __size, __dir) \
@@ -2075,7 +2078,7 @@ static void happy_meal_rx(struct happy_meal *hp, struct net_device *dev)
}
/* This card is _fucking_ hot... */
- skb->csum = ntohs(csum ^ 0xffff);
+ skb->csum = csum_unfold(~(__force __sum16)htons(csum));
skb->ip_summed = CHECKSUM_COMPLETE;
RXD(("len=%d csum=%4x]", len, csum));
diff --git a/drivers/net/sunhme.h b/drivers/net/sunhme.h
index 90f446db9ba..4da5539fac7 100644
--- a/drivers/net/sunhme.h
+++ b/drivers/net/sunhme.h
@@ -302,9 +302,11 @@
* Always write the address first before setting the ownership
* bits to avoid races with the hardware scanning the ring.
*/
+typedef u32 __bitwise__ hme32;
+
struct happy_meal_rxd {
- u32 rx_flags;
- u32 rx_addr;
+ hme32 rx_flags;
+ hme32 rx_addr;
};
#define RXFLAG_OWN 0x80000000 /* 1 = hardware, 0 = software */
@@ -313,8 +315,8 @@ struct happy_meal_rxd {
#define RXFLAG_CSUM 0x0000ffff /* HW computed checksum */
struct happy_meal_txd {
- u32 tx_flags;
- u32 tx_addr;
+ hme32 tx_flags;
+ hme32 tx_addr;
};
#define TXFLAG_OWN 0x80000000 /* 1 = hardware, 0 = software */
@@ -400,7 +402,7 @@ struct happy_meal {
struct hmeal_init_block *happy_block; /* RX and TX descriptors (CPU addr) */
#if defined(CONFIG_SBUS) && defined(CONFIG_PCI)
- u32 (*read_desc32)(u32 *);
+ u32 (*read_desc32)(hme32 *);
void (*write_txd)(struct happy_meal_txd *, u32, u32);
void (*write_rxd)(struct happy_meal_rxd *, u32, u32);
u32 (*dma_map)(void *, void *, long, int);