Simpler way of dealing with the firmware 4KB boundary crossing
restriction for rx buffers. This fixes a variety of memory
corruption issues when using an "uncommon" MTU with a 16KB
page size.
Signed-off-by: Brice Goglin <[EMAIL PROTECTED]>
---
drivers/net/myri10ge/myri10ge.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)
Index: linux-rc/drivers/net/myri10ge/myri10ge.c
===================================================================
--- linux-rc.orig/drivers/net/myri10ge/myri10ge.c 2007-04-06
09:05:17.000000000 +0200
+++ linux-rc/drivers/net/myri10ge/myri10ge.c 2007-04-10 21:03:59.000000000
+0200
@@ -900,19 +900,9 @@
/* try to refill entire ring */
while (rx->fill_cnt != (rx->cnt + rx->mask + 1)) {
idx = rx->fill_cnt & rx->mask;
-
- if ((bytes < MYRI10GE_ALLOC_SIZE / 2) &&
- (rx->page_offset + bytes <= MYRI10GE_ALLOC_SIZE)) {
+ if (rx->page_offset + bytes <= MYRI10GE_ALLOC_SIZE) {
/* we can use part of previous page */
get_page(rx->page);
-#if MYRI10GE_ALLOC_SIZE > 4096
- /* Firmware cannot cross 4K boundary.. */
- if ((rx->page_offset >> 12) !=
- ((rx->page_offset + bytes - 1) >> 12)) {
- rx->page_offset =
- (rx->page_offset + bytes) & ~4095;
- }
-#endif
} else {
/* we need a new page */
page =
@@ -941,6 +931,13 @@
/* start next packet on a cacheline boundary */
rx->page_offset += SKB_DATA_ALIGN(bytes);
+
+#if MYRI10GE_ALLOC_SIZE > 4096
+ /* don't cross a 4KB boundary */
+ if ((rx->page_offset >> 12) !=
+ ((rx->page_offset + bytes - 1) >> 12))
+ rx->page_offset = (rx->page_offset + 4096) & ~4095;
+#endif
rx->fill_cnt++;
/* copy 8 descriptors to the firmware at a time */
-
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