> > > + /* Tell HW to xmit */
> > > + __raw_writeq(cpu_to_be64(mapaddr), elem->hw_desc + C2_TXP_ADDR);
> > > + __raw_writew(cpu_to_be16(maplen), elem->hw_desc + C2_TXP_LEN);
> > > + __raw_writew(cpu_to_be16(TXP_HTXD_READY), elem->hw_desc + C2_TXP_FLAGS);
> >
> > or here
> >
>
> No need here. This logic submits the packet for transmission. We don't
> assume it is transmitted until we (after a completion interrupt usually)
> read back the HTXD entry and see the TXP_HTXD_DONE bit set (see
> c2_tx_interrupt()).
... but will that interrupt happen at all if these 3 writes never hit
the hardware?
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