[18/22] Cyclades PC300 driver: adjust SCA-II DMA buffer parameters
From: Andrea Shepard <hidden>
Date: 2012-01-30 02:58:25
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Subsystem:
cyclades pc300 driver, networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The DMA buffer interrupt trigger levels in the original driver do not seem suitable and lead to poor performance (around 30 kilobytes/sec on a full T1, in my test). These new values seem to be optimal. Signed-off-by: Andrea Shepard <redacted>
diff --git a/drivers/net/wan/pc300_drv.c b/drivers/net/wan/pc300_drv.c
index 4d81507..6cecef5 100644
--- a/drivers/net/wan/pc300_drv.c
+++ b/drivers/net/wan/pc300_drv.c@@ -3486,7 +3486,8 @@ static int rx_config(pc300dev_t *d) /* General RX settings */ cpc_writeb(scabase + M_REG(RRC, ch), 0); - cpc_writeb(scabase + M_REG(RNR, ch), 16); + cpc_writeb(scabase + M_REG(RNR, ch), 8); + cpc_writeb(scabase + M_REG(RCR, ch), 16); /* Enable reception */ cpc_writeb(scabase + M_REG(CMD, ch), CMD_RX_CRC_INIT);
@@ -3517,10 +3518,10 @@ static int tx_config(pc300dev_t *d) /* General TX settings */ cpc_writeb(scabase + M_REG(TRC0, ch), 0); - cpc_writeb(scabase + M_REG(TFS, ch), 32); - cpc_writeb(scabase + M_REG(TNR0, ch), 20); - cpc_writeb(scabase + M_REG(TNR1, ch), 48); - cpc_writeb(scabase + M_REG(TCR, ch), 8); + cpc_writeb(scabase + M_REG(TFS, ch), 0x3c); + cpc_writeb(scabase + M_REG(TNR0, ch), 0x38); + cpc_writeb(scabase + M_REG(TNR1, ch), 0x3f); + cpc_writeb(scabase + M_REG(TCR, ch), 0x38); /* Enable transmission */ cpc_writeb(scabase + M_REG(CMD, ch), CMD_TX_CRC_INIT);