Datasheet

Intel

82599 10 GbE Controller—Errata

Workaround:

Software - Reset Flow Director (FD) tables when max-length indication is observed, or hold image of all

the FD table and update the FD table (holding the image is less recommended).

The FD table is the hardware internal memory structure. Clearing this table means that the packet

buffer memory of FD is cleared and linked to the empty link-list and head/tail CSRs are initialized. All

other CSR are re-configured by software (see Datasheet)

Status: B0=Yes; NoFix

3 Flow Director: Filter Might Lose Length-Error

Attribute in Perfect-Match Mode

Problem:

In order to avoid high latency, the length of the Flow Director (FD) filters linked list is limited. The

length limit is programmable (FDIRCTRL.Max-Length field). If a linked list exceeds this limit, a length

error is reported in the FDIRErr.length field in the Rx descriptor.

In some rare cases a filter that has the length-error attribute might change the attribute to No-Length-

Error. As a result, the FD table includes long lists, which are not reported to software. Once a packet

matches these filters it causes a slightly higher latency in the device.

Implication:

There is no expected impact. In the cases where this indication is important, we expect other filters to

indicate length-error.

FD tables are reset, which lowers the probability of reaching this case.There is also no impact to packet

counters.

Workaround:

None.

Status: B0=Yes; NoFix

4 Flow Director: L4Packet Type Might Give Wrong

Indication

Problem:

The MSB of the L4 Packet Type (L4TYPE) field in the Flow Director Filters Command Register

(FDIRMC[6]) might give a wrong value during read access. The flow director filters operate with the

correct parameters.

Implication:

No impact on functionality. Software should ignore the read result of this bit.

Workaround:

None. Make sure that in a read to verify successful write, this bit is ignored.

Status: B0=Yes; NoFix