WX_MAX_TXD
ring->tx_max_pending = WX_MAX_TXD;
if (ring->count < WX_MAX_TXD)
new_tx_count = clamp_t(u32, ring->tx_pending, WX_MIN_TXD, WX_MAX_TXD);
new_tx_count = clamp_t(u32, ring->tx_pending, WX_MIN_TXD, WX_MAX_TXD);