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| author | Brice Goglin <brice@myri.com> | 2007-04-10 21:21:08 +0200 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-04-11 11:54:44 -0400 |
| commit | ae8509b1876e6e1074edc9846296e80983e30502 (patch) | |
| tree | bc7ee82e0134ea9b88a2e26c367e97160536caf4 | |
| parent | 6cdbd77e8883aac2e24f8b19b91e5b1c839213a0 (diff) | |
| download | op-kernel-dev-ae8509b1876e6e1074edc9846296e80983e30502.zip op-kernel-dev-ae8509b1876e6e1074edc9846296e80983e30502.tar.gz | |
myri10ge: fix management of the firmware 4KB boundary crossing restriction
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 <brice@myri.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
| -rw-r--r-- | drivers/net/myri10ge/myri10ge.c | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c index c216e6a..1e7fa2f 100644 --- a/drivers/net/myri10ge/myri10ge.c +++ b/drivers/net/myri10ge/myri10ge.c @@ -900,19 +900,9 @@ myri10ge_alloc_rx_pages(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx, /* 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 @@ myri10ge_alloc_rx_pages(struct myri10ge_priv *mgp, struct myri10ge_rx_buf *rx, /* 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 */ |
