Align each RX descriptor to a 4KB boundary; fixes poor RX performance (chip

would stop RX operation if it had to cross a 4KB boundary during receive).

2 files changed, 6 insertions, 6 deletions

diff --git a/sys/arch/sgi/dev/if_iec.c b/sys/arch/sgi/dev/if_iec.c
index 9fad9e35e36..3cc4c4b0015 100644
--- a/sys/arch/sgi/dev/if_iec.c
+++ b/sys/arch/sgi/dev/if_iec.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_iec.c,v 1.4 2009/11/03 18:48:38 miod Exp $	*/
+/*	$OpenBSD: if_iec.c,v 1.5 2009/11/03 21:41:42 miod Exp $	*/
 
 /*
  * Copyright (c) 2009 Miodrag Vallat.
@@ -194,9 +194,9 @@ struct iec_control_data {
  *   16KB boundaries (note layout of struct iec_control_data makes sure
  *   the rx desc array starts 16KB after the tx desc array).
  * - each txdesc should be 128 byte aligned (this is also enforced by
- *   struct iec_control_data layout)
- * - each rxdesc should be 128 byte aligned (this is enforced by
- *   struct iec_rxdesc layout).
+ *   struct iec_control_data layout).
+ * - each rxdesc should be aligned on a 4KB boundary (this is enforced by
+ *   struct iec_control_data and struct icd_rxdesc layouts).
  */
 #define	IEC_DMA_BOUNDARY	0x4000
 
diff --git a/sys/arch/sgi/dev/if_iecreg.h b/sys/arch/sgi/dev/if_iecreg.h
index 4e4b8efbce2..c9d2326eb0d 100644
--- a/sys/arch/sgi/dev/if_iecreg.h
+++ b/sys/arch/sgi/dev/if_iecreg.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_iecreg.h,v 1.2 2009/11/03 18:46:00 miod Exp $	*/
+/*	$OpenBSD: if_iecreg.h,v 1.3 2009/11/03 21:41:42 miod Exp $	*/
 
 /*
  * Copyright (c) 2009 Miodrag Vallat.
@@ -26,7 +26,7 @@
 
 #define	IEC_NRXDESC_MAX		512
 
-#define IEC_RXDESCSIZE		(13 * 128)	/* should be 128byte aligned. */
+#define IEC_RXDESCSIZE		(4096)
 #define IEC_RXD_BUFOFFSET	(64 + 2)	/* to align Ethernet header */
 #define IEC_RXD_NRXPAD		(IEC_RXD_BUFOFFSET - 2 * sizeof(uint32_t))
 #define IEC_RXD_BUFSIZE		(IEC_RXDESCSIZE - IEC_RXD_BUFOFFSET)