From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Mon, 14 Sep 2009 06:12:55 +0000 (+0000)
Subject: sky2: transmit ring accounting
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=07e316377458484d95f7624f7af7af99d9bd18cb;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

sky2: transmit ring accounting

Be more accurate about number of transmit list elements required.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 00bc65a0aac9..fc3803316970 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -65,8 +65,8 @@
 #define RX_DEF_PENDING		RX_MAX_PENDING
 
 /* This is the worst case number of transmit list elements for a single skb:
-   VLAN + TSO + CKSUM + Data + skb_frags * DMA */
-#define MAX_SKB_TX_LE	(4 + (sizeof(dma_addr_t)/sizeof(u32))*MAX_SKB_FRAGS)
+   VLAN:GSO + CKSUM + Data + skb_frags * DMA */
+#define MAX_SKB_TX_LE	(2 + (sizeof(dma_addr_t)/sizeof(u32))*(MAX_SKB_FRAGS+1))
 #define TX_MIN_PENDING		(MAX_SKB_TX_LE+1)
 #define TX_MAX_PENDING		4096
 #define TX_DEF_PENDING		127
@@ -1567,11 +1567,13 @@ static unsigned tx_le_req(const struct sk_buff *skb)
 {
 	unsigned count;
 
-	count = sizeof(dma_addr_t) / sizeof(u32);
-	count += skb_shinfo(skb)->nr_frags * count;
+	count = (skb_shinfo(skb)->nr_frags + 1)
+		* (sizeof(dma_addr_t) / sizeof(u32));
 
 	if (skb_is_gso(skb))
 		++count;
+	else if (sizeof(dma_addr_t) == sizeof(u32))
+		++count;	/* possible vlan */
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
 		++count;