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1131c927c4
COP allows fine-grained control on whether to offload a TCP connection using t4_tom, and what settings to apply to a connection selected for offload. t4_tom must still be loaded and IFCAP_TOE must still be enabled for full TCP offload to take place on an interface. The difference is that IFCAP_TOE used to be the only knob and would enable TOE for all new connections on the inteface, but now the driver will also consult the COP, if any, before offloading to the hardware TOE. A policy is a plain text file with any number of rules, one per line. Each rule has a "match" part consisting of a socket-type (L = listen, A = active open, P = passive open, D = don't care) and a pcap-filter(7) expression, and a "settings" part that specifies whether to offload the connection or not and the parameters to use if so. The general format of a rule is: [socket-type] expr => settings Example. See cxgbetool(8) for more information. [L] ip && port http => offload [L] port 443 => !offload [L] port ssh => offload [P] src net 192.168/16 && dst port ssh => offload !nagle !timestamp cong newreno [P] dst port ssh => offload !nagle ecn cong tahoe [P] dst port http => offload [A] dst port 443 => offload tls [A] dst net 192.168/16 => offload !timestamp cong highspeed The driver processes the rules for each new listen, active open, or passive open and stops at the first match. There is an implicit rule at the end of every policy that prohibits offload when no rule in the policy matches: [D] all => !offload This is a reworked and expanded version of a patch submitted by Krishnamraju Eraparaju @ Chelsio. Sponsored by: Chelsio Communications |
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| .. | ||
| common | ||
| crypto | ||
| cudbg | ||
| cxgbei | ||
| firmware | ||
| iw_cxgbe | ||
| tom | ||
| adapter.h | ||
| if_cc.c | ||
| if_ccv.c | ||
| if_cxl.c | ||
| if_cxlv.c | ||
| offload.h | ||
| osdep.h | ||
| t4_if.m | ||
| t4_ioctl.h | ||
| t4_iov.c | ||
| t4_l2t.c | ||
| t4_l2t.h | ||
| t4_main.c | ||
| t4_mp_ring.c | ||
| t4_mp_ring.h | ||
| t4_netmap.c | ||
| t4_sched.c | ||
| t4_sge.c | ||
| t4_tracer.c | ||
| t4_vf.c | ||