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Message-ID: <AANLkTinx-n045io5bPT-u_7T5cEiu6+74p30=94vkhPU@mail.gmail.com>
Date: Tue, 28 Dec 2010 14:27:44 +0900
From: Akinobu Mita <akinobu.mita@...il.com>
To: Ben Hutchings <ben@...adent.org.uk>
Cc: David Miller <davem@...emloft.net>,
Ion Badulescu <ionut@...ula.org>,
netdev <netdev@...r.kernel.org>, fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH net-2.6] starfire: Replace broken preprocessor test for
dma_addr_t size
2010/12/28 Ben Hutchings <ben@...adent.org.uk>:
> Commit 56543af "starfire: use BUILD_BUG_ON for netdrv_addr_t" revealed
> that the preprocessor condition used to find the size of dma_addr_t
> yielded the wrong result for some architectures and configurations.
> This was kluged for 64-bit PowerPC in commit 3e502e6 by adding yet
> another case to the condition. However, some MIPS configurations are
> still handled incorrectly.
>
> Replace the preprocessor test with expressions using ?: or
> __builtin_choose_expr() as necessary.
I remember ARCH_DMA_ADDR_T_64BIT was introduced to handle this kind of
test easily.
So please use CONFIG_ARCH_DMA_ADDR_T_64BIT for this test.
You may also need to set ARCH_DMA_ADDR_T_64BIT for the MIPS
architecture correctly.
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
> This is compile-tested only.
>
> The build failure on MIPS can be seen at
> <https://buildd.debian.org/fetch.cgi?pkg=linux-2.6;ver=2.6.37~rc7-1~experimental.1;arch=mips;stamp=1293414847>.
>
> Ben.
>
> drivers/net/starfire.c | 59 +++++++++++++++++++----------------------------
> 1 files changed, 24 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/net/starfire.c b/drivers/net/starfire.c
> index 4adf124..ea789d6 100644
> --- a/drivers/net/starfire.c
> +++ b/drivers/net/starfire.c
> @@ -144,31 +144,22 @@ static int full_duplex[MAX_UNITS] = {0, };
> /* Time in jiffies before concluding the transmitter is hung. */
> #define TX_TIMEOUT (2 * HZ)
>
> -/*
> - * This SUCKS.
> - * We need a much better method to determine if dma_addr_t is 64-bit.
> - */
> -#if (defined(__i386__) && defined(CONFIG_HIGHMEM64G)) || defined(__x86_64__) || defined (__ia64__) || defined(__alpha__) || defined(__mips64__) || (defined(__mips__) && defined(CONFIG_HIGHMEM) && defined(CONFIG_64BIT_PHYS_ADDR)) || (defined(__powerpc64__) || defined(CONFIG_PHYS_64BIT))
> -/* 64-bit dma_addr_t */
> -#define ADDR_64BITS /* This chip uses 64 bit addresses. */
> -#define netdrv_addr_t __le64
> -#define cpu_to_dma(x) cpu_to_le64(x)
> -#define dma_to_cpu(x) le64_to_cpu(x)
> -#define RX_DESC_Q_ADDR_SIZE RxDescQAddr64bit
> -#define TX_DESC_Q_ADDR_SIZE TxDescQAddr64bit
> -#define RX_COMPL_Q_ADDR_SIZE RxComplQAddr64bit
> -#define TX_COMPL_Q_ADDR_SIZE TxComplQAddr64bit
> -#define RX_DESC_ADDR_SIZE RxDescAddr64bit
> -#else /* 32-bit dma_addr_t */
> -#define netdrv_addr_t __le32
> -#define cpu_to_dma(x) cpu_to_le32(x)
> -#define dma_to_cpu(x) le32_to_cpu(x)
> -#define RX_DESC_Q_ADDR_SIZE RxDescQAddr32bit
> -#define TX_DESC_Q_ADDR_SIZE TxDescQAddr32bit
> -#define RX_COMPL_Q_ADDR_SIZE RxComplQAddr32bit
> -#define TX_COMPL_Q_ADDR_SIZE TxComplQAddr32bit
> -#define RX_DESC_ADDR_SIZE RxDescAddr32bit
> -#endif
> +#define IS_ADDR_64BIT (sizeof(dma_addr_t) == 8)
> +#define cpu_to_dma(x) \
> + __builtin_choose_expr(IS_ADDR_64BIT, cpu_to_le64(x), cpu_to_le32(x))
> +#define dma_to_cpu(x) \
> + __builtin_choose_expr(IS_ADDR_64BIT, le64_to_cpu(x), le32_to_cpu(x))
> +typedef typeof(cpu_to_dma(0)) netdrv_addr_t;
> +#define RX_DESC_Q_ADDR_SIZE \
> + (IS_ADDR_64BIT ? RxDescQAddr64bit : RxDescQAddr32bit)
> +#define TX_DESC_Q_ADDR_SIZE \
> + (IS_ADDR_64BIT ? TxDescQAddr64bit : TxDescQAddr32bit)
> +#define RX_COMPL_Q_ADDR_SIZE \
> + (IS_ADDR_64BIT ? RxComplQAddr64bit : RxComplQAddr32bit)
> +#define TX_COMPL_Q_ADDR_SIZE \
> + (IS_ADDR_64BIT ? TxComplQAddr64bit : TxComplQAddr32bit)
> +#define RX_DESC_ADDR_SIZE \
> + (IS_ADDR_64BIT ? RxDescAddr64bit : RxDescAddr32bit)
>
> #define skb_first_frag_len(skb) skb_headlen(skb)
> #define skb_num_frags(skb) (skb_shinfo(skb)->nr_frags + 1)
> @@ -512,13 +503,12 @@ struct starfire_tx_desc_2 {
> __le64 addr;
> };
>
> -#ifdef ADDR_64BITS
> -typedef struct starfire_tx_desc_2 starfire_tx_desc;
> -#define TX_DESC_TYPE TxDescType2
> -#else /* not ADDR_64BITS */
> -typedef struct starfire_tx_desc_1 starfire_tx_desc;
> -#define TX_DESC_TYPE TxDescType1
> -#endif /* not ADDR_64BITS */
> +extern struct starfire_tx_desc_1 starfire_tx_desc_1_dummy(void);
> +extern struct starfire_tx_desc_2 starfire_tx_desc_2_dummy(void);
> +typedef typeof(__builtin_choose_expr(IS_ADDR_64BIT, starfire_tx_desc_2_dummy(),
> + starfire_tx_desc_1_dummy()))
> +starfire_tx_desc;
> +#define TX_DESC_TYPE (IS_ADDR_64BIT ? TxDescType2 : TxDescType1)
> #define TX_DESC_SPACING TxDescSpaceUnlim
>
> enum tx_desc_bits {
> @@ -731,9 +721,8 @@ static int __devinit starfire_init_one(struct pci_dev *pdev,
> #ifdef VLAN_SUPPORT
> dev->features |= NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER;
> #endif /* VLAN_RX_KILL_VID */
> -#ifdef ADDR_64BITS
> - dev->features |= NETIF_F_HIGHDMA;
> -#endif /* ADDR_64BITS */
> + if (IS_ADDR_64BIT)
> + dev->features |= NETIF_F_HIGHDMA;
>
> /* Serial EEPROM reads are hidden by the hardware. */
> for (i = 0; i < 6; i++)
> --
> 1.7.2.3
>
>
>
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