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pasemi_mac: workaround for erratum 5971 

pasemi_mac: workaround for erratum 5971

Implement workarounds for erratum 5971, where L2 hints aren't considered
properly unless the way hint is enabled on the interface. Since L2 isn't
setup to dedicate a way to headers, we need to reset the packet count
by hand so it won't run out of credits.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Olof Johansson 2007-10-02 16:26:30 -05:00 committed by David S. Miller
parent ad3c20d1ab
commit 9a50bebda9
2 changed files with 16 additions and 1 deletions
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9
drivers/net/pasemi_mac.c
View File

@ -239,7 +239,9 @@ static int pasemi_mac_setup_rx_resources(struct net_device *dev)
PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
write_dma_reg(mac, PAS_DMA_RXINT_CFG(mac->dma_if),
PAS_DMA_RXINT_CFG_DHL(2));
PAS_DMA_RXINT_CFG_DHL(3) |
PAS_DMA_RXINT_CFG_L2 |
PAS_DMA_RXINT_CFG_LW);
ring->next_to_fill = 0;
ring->next_to_clean = 0;
@ -589,6 +591,11 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
n += 2;
}
if (n > RX_RING_SIZE) {
/* Errata 5971 workaround: L2 target of headers */
write_iob_reg(mac, PAS_IOB_COM_PKTHDRCNT, 0);
n &= (RX_RING_SIZE-1);
}
mac->rx->next_to_clean = n;
pasemi_mac_replenish_rx_ring(mac->netdev, limit-count);

8
drivers/net/pasemi_mac.h
View File

@ -210,6 +210,8 @@ enum {
#define PAS_DMA_RXINT_CFG_DHL_S 24
#define PAS_DMA_RXINT_CFG_DHL(x) (((x) << PAS_DMA_RXINT_CFG_DHL_S) & \
PAS_DMA_RXINT_CFG_DHL_M)
#define PAS_DMA_RXINT_CFG_LW 0x00200000
#define PAS_DMA_RXINT_CFG_L2 0x00100000
#define PAS_DMA_RXINT_CFG_WIF 0x00000002
#define PAS_DMA_RXINT_CFG_WIL 0x00000001
@ -315,6 +317,12 @@ enum {
#define PAS_STATUS_SOFT 0x4000000000000000ull
#define PAS_STATUS_INT 0x8000000000000000ull
#define PAS_IOB_COM_PKTHDRCNT 0x120
#define PAS_IOB_COM_PKTHDRCNT_PKTHDR1_M 0x0fff0000
#define PAS_IOB_COM_PKTHDRCNT_PKTHDR1_S 16
#define PAS_IOB_COM_PKTHDRCNT_PKTHDR0_M 0x00000fff
#define PAS_IOB_COM_PKTHDRCNT_PKTHDR0_S 0
#define PAS_IOB_DMA_RXCH_CFG(i) (0x1100 + (i)*4)
#define PAS_IOB_DMA_RXCH_CFG_CNTTH_M 0x00000fff
#define PAS_IOB_DMA_RXCH_CFG_CNTTH_S 0