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