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From: Felix Fietkau <nbd@openwrt.org>
To: netdev@vger.kernel.org
Cc: zajec5@gmail.com, hauke@hauke-m.de
Subject: [PATCH v7 6/9] bgmac: increase rx ring size from 511 to 512
Date: Tue, 14 Apr 2015 12:07:59 +0200	[thread overview]
Message-ID: <1429006082-23489-6-git-send-email-nbd@openwrt.org> (raw)
In-Reply-To: <1429006082-23489-1-git-send-email-nbd@openwrt.org>

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>
---
 drivers/net/ethernet/broadcom/bgmac.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bgmac.h b/drivers/net/ethernet/broadcom/bgmac.h
index 3db0d52..e45e303 100644
--- 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 */
-- 
2.2.2

  parent reply	other threads:[~2015-04-14 10:08 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-14 10:07 [PATCH v7 1/9] bgmac: simplify tx ring index handling Felix Fietkau
2015-04-14 10:07 ` [PATCH v7 2/9] bgmac: leave interrupts disabled as long as there is work to do Felix Fietkau
2015-04-14 10:07 ` [PATCH v7 3/9] bgmac: set received skb headroom to NET_SKB_PAD Felix Fietkau
2015-04-14 10:07 ` [PATCH v7 4/9] bgmac: simplify/optimize rx DMA error handling Felix Fietkau
2015-04-14 10:36   ` Rafał Miłecki
2015-04-14 10:07 ` [PATCH v7 5/9] bgmac: add check for oversized packets Felix Fietkau
2015-04-14 10:07 ` Felix Fietkau [this message]
2015-04-14 10:08 ` [PATCH v7 7/9] bgmac: simplify dma init/cleanup Felix Fietkau
2015-04-14 10:38   ` Rafał Miłecki
2015-04-14 10:08 ` [PATCH v7 8/9] bgmac: fix DMA rx corruption Felix Fietkau
2015-04-14 10:08 ` [PATCH v7 9/9] bgmac: drop ring->num_slots Felix Fietkau
2015-04-14 10:29 ` [PATCH v7 1/9] bgmac: simplify tx ring index handling Rafał Miłecki
2015-04-14 18:55 ` David Miller

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