conditional on FXPF_EXT_TXCB, so, replace all uses with that
- for the pci frontend, reestablish some flags lost the the prior
changes and simplify one of the cases
this fixes PR 40677 and may fix PR 40431.
Rev 1.41:
> use a nop with I bit set at the end of the tx chain. This avoids a race
> between status update and clearing the suspend bit on machines which can't
> write data smaller than 32bits at a time.
This should fix PR port-alpha/30560.
Rev 1.50:
> Fix nasty bug where driver would not correctly catch and handle an rnr
> condition when it was due to the the recieve buffers being exhausted with
> no packet transmits during that time. Symptom was that the fxp would
> simply stop interrupting for the next 15 seconds until the watchdog kicked
> in and reset the chip due to 15 seconds of inactivity, making the fxp very
> poorly behaved when hammered on hard.
Rev 1.61:
> Defer reinitialisation of the RU until after the interrupt handler has had
> a chance to process all pending packets, otherwise the chip may overwrite
> their mbuf clusters after we have freed them.
>
> Eliminates a race that can cause random pool corruption when reconfiguring
> an interface under heavy network load.
And one more change for RX sanity:
- put RU into suspend when the last RFA is processed.
These RNR/RU changes may fix pool corruption problems on fxp.
Tested on AlphaPC164 and i386 with i82559 and i82550.
- Add some additional config block bits for the i82558/i82559.
- Change the config block template to only fill in the must-be-one
reserved bits, leave fxp_init() to fill in all the important things.
- On the i82558/i82559, we can use "Receive Long Frames" rather than
"Save Bad Frames" to support the VLAN MTU.
- Use 802.3x flow control on the i82558/i82559. This is all handled
transparently by the hardware. When in promiscuous mode, allow
wire-watchers to see the flow control frames.
- Use the Extended TxCB format on the i82558/i82559. This places two
Transmit Buffer Descriptors directly in the TxCB, which should cover
the vast majority of packets transmitted. This saves PCI transactions
that would otherwise be required to fetch the TBD list.
With the tansmit queue length changes from yesterday, this gets us up to
11.5MB/s TCP transmit speed, out of an absolute maximum of 12MB/s possible
on a 100Mb/s link.
