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authorAlexey Brodkin <Alexey.Brodkin@synopsys.com>2013-09-25 19:27:48 +0400
committerJoe Hershberger <joe.hershberger@ni.com>2013-11-22 16:50:55 -0600
commited102be70f762afc39bda165ba57ea84dc9be39e (patch)
tree1056dc7f0270deb8db3283264267a486b768ed0e /drivers/net
parent227ad7b2b6fab024fff6f60613b0e90c9e3a6724 (diff)
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net: designware: Fix alignment of buffer descriptors
It's important that buffer descriptors are aligned in accordance to GMAC data bus width (32/64/128-bit). It's safe to align to 128-bit (16-bytes) for every bus width type. If buffer descriptor is improperly aligned GMAC discards lower bits of provided address and as a result reads from improper location that doesn't match expected fields. Commit ef76025a99247cdb8f927a2c9f15400678dfb599 "net: Multiple updates/enhancements to designware.c" introduced another structure member "link_printed" right before buffer descriptors while "padding" member was left untouched. This together with alignment of structure itself to 16-byte boundary forces buffer descriptoprs always to be 4-byte aligned that causes driver complete disfunction if GMAC bus width is 64 or 128-bit. Proposed change makes sure all buffer descriptors are 16-byte (128-bit) aligned. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Patch: 277902
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/designware.h7
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/net/designware.h b/drivers/net/designware.h
index e80002a..5440c92 100644
--- a/drivers/net/designware.h
+++ b/drivers/net/designware.h
@@ -112,7 +112,7 @@ struct dmamacdescr {
u32 dmamac_cntl;
void *dmamac_addr;
struct dmamacdescr *dmamac_next;
-};
+} __aligned(16);
/*
* txrx_status definitions
@@ -224,8 +224,7 @@ struct dw_eth_dev {
u32 tx_currdescnum;
u32 rx_currdescnum;
u32 phy_configured;
- int link_printed;
- u32 padding;
+ u32 link_printed;
struct dmamacdescr tx_mac_descrtable[CONFIG_TX_DESCR_NUM];
struct dmamacdescr rx_mac_descrtable[CONFIG_RX_DESCR_NUM];
@@ -237,7 +236,7 @@ struct dw_eth_dev {
struct eth_dma_regs *dma_regs_p;
struct eth_device *dev;
-} __attribute__ ((aligned(8)));
+};
/* Speed specific definitions */
#define SPEED_10M 1