CVS commit: src/sys

["Rin Okuyama" <rin%netbsd.org@localhost>]

Module Name:    src
Committed By:   rin
Date:           Wed Dec 12 01:46:47 UTC 2018

Modified Files:
        src/sys/net: if.c if_bridge.c if_bridgevar.h
        src/sys/rump/librump/rumpnet: net_stub.c

Log Message:
PR kern/53562

Handle TX offload in software when a packet is sent via
bridge_output(). We can send it as is in the following
exceptional cases:

For unicast:

(1) When the destination interface is the same as source.

(2) When the destination supports all TX offload options
    specified in a packet.

For multicast/broadcast:

(3) When all the members of the bridge support the specified
    TX offload options.

For (3), add sc_csum_flags_tx flag to bridge softc, which is
logical AND b/w capabilities of TX offload options in member
interface (ifp->if_csum_flags_tx). The flag is updated when a
member is (i) added to or (ii) removed from a bridge, or (iii)
if_csum_flags_tx flag of a member interface is manipulated via
ifconfig(8).

Turn on M_CSUM_TSOv[46] bit in ifp->if_csum_flags_tx flag when
TSO[46] is enabled for that interface.

OK msaitoh thorpej


To generate a diff of this commit:
cvs rdiff -u -r1.441 -r1.442 src/sys/net/if.c
cvs rdiff -u -r1.160 -r1.161 src/sys/net/if_bridge.c
cvs rdiff -u -r1.32 -r1.33 src/sys/net/if_bridgevar.h
cvs rdiff -u -r1.36 -r1.37 src/sys/rump/librump/rumpnet/net_stub.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.