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[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>
This commit is contained in:
Francois Romieu 2005-07-30 13:13:03 +02:00 committed by Jeff Garzik
parent 830fb7d232
commit 8b5641d4f1
1 changed files with 7 additions and 1 deletions
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8
drivers/net/sis190.c
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@ -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)