Now, we have M_CSUM_TSOv[46] bit in ifp->if_csum_flags_tx when
TSO[46] is enabled for the interface. So we can simply check
whether TSO[46] is required in a packet but missing in the
interface by (sw_csum & M_CSUM_TSOv[46]).
Note that this is a very rare case where TSO[46] is suddenly
turned off during a packet passing b/w TCP and IP.
part of PR kern/53562
OK msaitoh
software by ether_sw_offload_[tr]x().
For rump kernels, if_capabilities for shmemif(4) can be specified
by environmental variable RUMP_SHMIF_CAPENABLE:
setenv RUMP_SHMIF_CAPENABLE 0x7ff80 (all offload)
setenv RUMP_SHMIF_CAPENABLE 0x6aa80 (all TX)
setenv RUMP_SHMIF_CAPENABLE 0x15500 (all RX)
part of PR kern/53562
OK msaitoh
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
Add ether_sw_offload_[tr]x: handle TX/RX offload options in software.
Since this violates separation b/w L2 and L3/L4, new files are added
rather than having the routines in sys/net/if_ethersubr.c.
OK msaitoh thorpej
children successfully detach; this is especially important for
atapibus, which needs the thread to execute commands
fixes hang on poweroff with root on ATAPI cd(4), reported by Christoph Badura
Implement parameter and arithmetic expansion of $ENV
before using it as the name of a file from which to
read startup commands for the shell. This continues
to happen for all interactive shells, and non-interactive
shells for which the posix option is not set (-o posix).
On any actual error, or if an attempt is made to use
command substitution, then the value of ENV is used
unchanged as the file name.
The expansion complies with POSIX XCU 2.5.3, though that
only requires parameter expansion - arithmetic expansion
is an extension (but for us, it is much easier to do, than
not to do, and it allows some weird stuff, if you're so
inclined....) Note that there is no ~ expansion (use $HOME).
There is no clear indication doing these calculations and setting the
resulting register bits results in improved functionality. Contrary
to hints in the code, short-term precision of the UART clock doesn't
appear to improve when these bits are adjusted.
Neither the vendor's Linux driver nor the mainline Linux driver
currently touch these bits.
Tested with CH341A and a logic analyzer.
function KASSERT(), so that it actually does something; fix code using
it to actually pass correct params, so that it compiles
remove UFS_WAPBL_JUNLOCK_ASSERT(), as that is inherently racy (it's
okay on those places if the rwlock is held by other lwp); depend
on the RW_ASSERT()/LOCKDEBUG inside rw_enter() to catch the case
with wapbl rwlock held by current lwp
returns non-zero only if current lwp is the owner, the other two don't care
about owner; also warn that functions are not atomic, and thus should only
ever be used to assert that the lock is held
