openwrtv3/target/linux/generic/patches-4.0/072-09-bgmac-increase-rx-ring-size-from-511-to-512.patch
Rafał Miłecki e175b199f8 kernel: backport rest of bgmac patches to 4.0
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 45573
2015-04-23 19:11:11 +00:00

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897 B
Diff

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 */