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authorFelix Fietkau <nbd@openwrt.org>2015-04-12 22:10:40 +0000
committerFelix Fietkau <nbd@openwrt.org>2015-04-12 22:10:40 +0000
commitafafbc0d7454cb3271477698782cdf3197d06295 (patch)
tree0cf5aeb23108f087330c144a02e97f0aa48d2bae /target/linux/generic/patches-3.18/077-09-bgmac-increase-rx-ring-size-from-511-to-512.patch
parent09722d0bdcce6a021ec20bdefc158878ce49b8dc (diff)
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kernel: bgmac: add more DMA related fixes
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 45407
Diffstat (limited to 'target/linux/generic/patches-3.18/077-09-bgmac-increase-rx-ring-size-from-511-to-512.patch')
-rw-r--r--target/linux/generic/patches-3.18/077-09-bgmac-increase-rx-ring-size-from-511-to-512.patch23
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diff --git a/target/linux/generic/patches-3.18/077-09-bgmac-increase-rx-ring-size-from-511-to-512.patch b/target/linux/generic/patches-3.18/077-09-bgmac-increase-rx-ring-size-from-511-to-512.patch
new file mode 100644
index 0000000000..4888cc32af
--- /dev/null
+++ b/target/linux/generic/patches-3.18/077-09-bgmac-increase-rx-ring-size-from-511-to-512.patch
@@ -0,0 +1,23 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 12 Apr 2015 22:36:16 +0200
+Subject: [PATCH] bgmac: increase rx ring size from 511 to 512
+
+Limiting it to 511 looks like a failed attempt at leaving one descriptor
+empty to allow the hardware to stop processing a buffer that has not
+been prepared yet. However, this doesn't work because this affects the
+total ring size as well
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.h
++++ b/drivers/net/ethernet/broadcom/bgmac.h
+@@ -356,7 +356,7 @@
+ #define BGMAC_MAX_RX_RINGS 1
+
+ #define BGMAC_TX_RING_SLOTS 128
+-#define BGMAC_RX_RING_SLOTS 512 - 1 /* Why -1? Well, Broadcom does that... */
++#define BGMAC_RX_RING_SLOTS 512
+
+ #define BGMAC_RX_HEADER_LEN 28 /* Last 24 bytes are unused. Well... */
+ #define BGMAC_RX_FRAME_OFFSET 30 /* There are 2 unused bytes between header and real data */