openslx-ng/ipxe.git/src/drivers, branch v0.9.8

[hermon] Reset device during probe()

2009-10-14T01:11:16+00:00

Some systems will retry their boot sequence in the event of a boot failure. On these systems, the second and subsequent boot attempts will fail to initialise the Hermon HCA. Fix by resetting the HCA during probe(). This incurs a one-second cost, but there seems to be no viable alternative. Originally-fixed-by: Itay Gazit

[pci] Add generic configuration space backup/restore facility

2009-10-14T01:06:23+00:00

Some devices can only be reset via a mechanism that also resets the card's PCI core, thus necessitating a backup and restore of all or part of the PCI configuration space across a reset.

[ath5k] Remove spurious debugging check

2009-08-17T23:10:53+00:00

Signed-off-by: Marty Connor

[netdevice] Allow the hardware and link-layer addresses to differ in size

2009-08-11T23:23:38+00:00

IPoIB has a 20-byte link-layer address, of which only eight bytes represent anything relating to a "hardware address". The PXE and EFI SNP APIs expect the permanent address to be the same size as the link-layer address, so fill in the "permanent address" field with the initial link layer address (as generated by register_netdev() based upon the real hardware address).

[netdevice] Separate out the concept of hardware and link-layer addresses

2009-08-11T23:19:14+00:00

The hardware address is an intrinsic property of the hardware, while the link-layer address can be changed at runtime. This separation is exposed via APIs such as PXE and EFI, but is currently elided by gPXE. Expose the hardware and link-layer addresses as separate properties within a net device. Drivers should now fill in hw_addr, which will be used to initialise ll_addr at the time of calling register_netdev().

[infiniband] Allow SRP reconnection attempts even after reporting failures

2009-08-10T21:30:56+00:00

With iSCSI, connection attempts are expensive; it may take many seconds to determine that a connection will fail. SRP connection attempts are much less expensive, so we may as well avoid the "optimisation" of declaring a state of permanent failure after a certain number of attempts. This allows a gPXE SRP initiator to resume operations after an arbitrary amount of SRP target downtime.

[infiniband] Add support for SRP over Infiniband

2009-08-10T21:27:33+00:00

SRP is the SCSI RDMA Protocol. It allows for a method of SAN booting whereby the target is responsible for reading and writing data using Remote DMA directly to the initiator's memory. The software initiator merely sends and receives SCSI commands; it never has to touch the actual data.

[hermon] Reduce the RC ACK timeout

2009-08-10T21:22:42+00:00

The ACK timeout determines how long we take to notice a failed Reliable Connection. Reducing it from the arbitrary value of 19 down to 14 reduces the individual ACK timeout from around 2.1s to 67ms; this in turn reduces the time to tear down and re-establish a broken SRP session from around 30s to around 1s.

[hermon] Randomise the high-order bits of queue pair numbers

2009-08-10T21:19:39+00:00

The Infiniband Communication Manager will refuse to establish a connection if it believes the connection is already established. There is no immediately obvious way to ask it to tear down the existing connection and replace it; to issue a DREP we would need to know the local and remote communication IDs used for the previous connection setup. We can work around this by randomising the high-order bits of the queue pair number; these have no significance to the hardware, but are sufficient to convince the IB CM that this is a different connection.

[scsi] Generalise iscsi_parse_lun() to scsi_parse_lun()

2009-08-10T18:30:41+00:00