SGE_RX_PULL_LEN
newskb = alloc_skb(SGE_RX_PULL_LEN, GFP_ATOMIC);
__skb_put(newskb, SGE_RX_PULL_LEN);
memcpy(newskb->data, sd->pg_chunk.va, SGE_RX_PULL_LEN);
sd->pg_chunk.offset + SGE_RX_PULL_LEN,
len - SGE_RX_PULL_LEN);
newskb->data_len = len - SGE_RX_PULL_LEN;