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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>
This commit is contained in:
Stephen Hemminger 2009-09-14 06:12:55 +00:00 committed by David S. Miller
parent 99455153d0
commit 07e3163774
1 changed files with 6 additions and 4 deletions
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10
drivers/net/sky2.c
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@ -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;