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| author | Francois Romieu <romieu@fr.zoreil.com> | 2005-07-30 13:13:03 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-07-30 18:21:00 -0400 |
| commit | 8b5641d4f1f7376257783b79f121a19ccd86b56b (patch) | |
| tree | ff22ed47573d826d8744effd78edefd30100c8fe /drivers/net/sis190.c | |
| parent | 830fb7d23217ae748df0b16d4d419110810036b7 (diff) | |
| download | blackbird-op-linux-8b5641d4f1f7376257783b79f121a19ccd86b56b.tar.gz blackbird-op-linux-8b5641d4f1f7376257783b79f121a19ccd86b56b.zip | |
[PATCH] sis190: the size of the Rx buffer is constrained
Add a restriction to the size of the Rx buffer
SiS driver forces the size of any Rx buffer to be a multiple of 64 bit.
I would not be surprized that it goes along with some alignment issues
which have been experienced before. So far it does not make much of a
difference (both drivers use 1536 bytes buffer).
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Diffstat (limited to 'drivers/net/sis190.c')
| -rw-r--r-- | drivers/net/sis190.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/net/sis190.c b/drivers/net/sis190.c index 1e8e7111c261..2229698debbd 100644 --- a/drivers/net/sis190.c +++ b/drivers/net/sis190.c @@ -69,6 +69,7 @@ #define TX_RING_BYTES (NUM_TX_DESC * sizeof(struct TxDesc)) #define RX_RING_BYTES (NUM_RX_DESC * sizeof(struct RxDesc)) #define RX_BUF_SIZE 1536 +#define RX_BUF_MASK 0xfff8 #define SIS190_REGS_SIZE 0x80 #define SIS190_TX_TIMEOUT (6*HZ) @@ -400,7 +401,7 @@ static inline void sis190_give_to_asic(struct RxDesc *desc, u32 rx_buf_sz) u32 eor = le32_to_cpu(desc->size) & RingEnd; desc->PSize = 0x0; - desc->size = cpu_to_le32(rx_buf_sz | eor); + desc->size = cpu_to_le32((rx_buf_sz & RX_BUF_MASK) | eor); wmb(); desc->status = cpu_to_le32(OWNbit | INTbit); } @@ -924,6 +925,11 @@ static void sis190_set_rxbufsize(struct sis190_private *tp, unsigned int mtu = dev->mtu; tp->rx_buf_sz = (mtu > RX_BUF_SIZE) ? mtu + ETH_HLEN + 8 : RX_BUF_SIZE; + /* RxDesc->size has a licence to kill the lower bits */ + if (tp->rx_buf_sz & 0x07) { + tp->rx_buf_sz += 8; + tp->rx_buf_sz &= RX_BUF_MASK; + } } static int sis190_open(struct net_device *dev) |
