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These filters reside in the card's memory instead of its TCAM and can be configured via a new "hashfilter" subcommand in cxgbetool. Hash and normal TCAM filters can be used together. The hardware does an exact-match of packet fields for hash filters, unlike the masked match performed for TCAM filters. Any T5/T6 card with memory can support at least half a million hash filters. The sample config file with the driver configures 512K of these, it is possible to double this to 1 million+ in some cases. The chip does an exact-match of fields of incoming datagrams with hash filters and performs the action configured for the filter if it matches. The fields to match are specified in a "filter mask" in the firmware config file. The filter mask always includes the 5-tuple (sip, dip, sport, dport, ipproto). It can, optionally, also include any subset of the filter mode (see filterMode and filterMask in the firmware config file). For example: filterMode = fragmentation, mpshittype, protocol, vlan, port, fcoe filterMask = protocol, port, vlan Exact values of the 5-tuple, the physical port, and VLAN tag would have to be provided while setting up a hash filter with the chip configuration above. Hash filters support all actions supported by TCAM filters. A packet that hits a hash filter can be dropped, let through (with optional steering to a specific queue or RSS region), switched out of another port (with optional L2 rewrite of DMAC, SMAC, VLAN tag), or get NAT'ed. (Support for some of these will show up in the driver in a follow-up commit very shortly). Sponsored by: Chelsio Communications
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