cxgbit_skcb_tx_wr_next
cxgbit_skcb_tx_wr_next(skb) = NULL;
cxgbit_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
csk->wr_pending_head = cxgbit_skcb_tx_wr_next(skb);
cxgbit_skcb_tx_wr_next(skb) = NULL;
skb = cxgbit_skcb_tx_wr_next(skb);