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authorStephen Hemminger <shemminger@linux-foundation.org>2009-09-14 06:12:55 +0000
committerDavid S. Miller <davem@davemloft.net>2009-09-15 02:49:57 -0700
commit07e316377458484d95f7624f7af7af99d9bd18cb (patch)
tree0059cfd77ec983ded585a8cadc9f7d410893d581 /drivers
parent99455153d0670ba110e6a3b855b8369bcbd11120 (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/sky2.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 00bc65a0aac..fc380331697 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;