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 <[EMAIL PROTECTED]>
Index: k.org/drivers/net/pasemi_mac.c
===================================================================
--- k.org.orig/drivers/net/pasemi_mac.c
+++ k.org/drivers/net/pasemi_mac.c
@@ -239,7 +239,9 @@ static int pasemi_mac_setup_rx_resources
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 pa
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);
Index: k.org/drivers/net/pasemi_mac.h
===================================================================
--- k.org.orig/drivers/net/pasemi_mac.h
+++ k.org/drivers/net/pasemi_mac.h
@@ -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
-
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