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Commit descriptions for the interface capabilities support.

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This commit is contained in:
Jeroen Ruigrok van der Werven 2001-09-22 12:34:19 +00:00
parent cfd848db6f
commit f5170ab181
1 changed files with 40 additions and 3 deletions
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43
share/man/man9/ifnet.9
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@ -219,7 +219,7 @@ The fields of
.Li "struct ifnet"
are as follows:
.Pp
.Bl -tag -width "if_poll_slowq" -offset indent
.Bl -tag -width "if_capabilities" -offset indent
.It Li "if_softc"
.Pq Li "void *"
A pointer to the driver's private state block. (Initialized by
@ -280,6 +280,12 @@ decremented by generic watchdog code.)
.Pq Li "short"
Flags describing operational parameters of this interface (see below).
(Manipulated by both driver and generic code.)
.It Li "if_capabilities"
.Pq Li "int"
Flags describing the capabilities the interface supports (see below).
.It Li "if_enable"
.Pq Li "int"
Flags describing the enabled capabilties of the interface (see below).
.\" .It Li "if_ipending"
.\" Interrupt-pending bits for polled operation:
.\" .Dv IFI_XMIT
@ -441,6 +447,33 @@ defines the bits which cannot be set by a user program using the
command to
.Xr ioctl 2 ;
these are indicated by an asterisk in the listing above.
.Ss Interface capabilities flags
Interface capabilities are specialized features an interface may
or may not support.
These capabilities are very hardware-specific
and allow, when enabled,
to offload specific network processing to the interface.
.Pp
.Bl -tag -width "IFCAP_NETCONS" -offset indent
.It Dv IFCAP_HWCSUM
This interface can do checksum validation for the IP stack on both
receiving and transmitting data.
Some interfaces do not have sufficient buffer storage to store frames
above a certain MTU-size completely.
The driver for the interface might disable hardware checksum validation
if the MTU is set above the hardcoded limit.
.It Dv IFCAP_NETCONS
This interface can be a network console.
.It Dv IFCAP_RXCSUM
This interface can do checksum validation for the IP stack on receiving data.
Some interfaces do not have sufficient buffer storage to store frames
above a certain MTU-size completely.
The driver for the interface might disable hardware checksum validation
if the MTU is set above the hardcoded limit.
.It Dv IFCAP_TXCSUM
This interface can do checksum calculation for the IP stack on transmitting
data.
.El
.Ss The if_data structure
In
.Bx 4.4 ,
@ -800,13 +833,17 @@ further interpretation. The following commands are handled by
.It Dv SIOCGIFCONF
.It Dv OSIOCGIFCONF
Get interface configuration. (No call-down to driver.)
.It Dv SIOCGIFCAP
.It Dv SIOCGIFFLAGS
.It Dv SIOCGIFMETRIC
.It Dv SIOCGIFMTU
.It Dv SIOCGIFPHYS
Get interface flags, metric, MTU, medium selection. (No call-down to
driver.)
Get interface capabilities, flags, metric, MTU, medium selection.
(No call-down to driver.)
.Pp
.It Dv SIOCSIFCAP
Enable interface capabilities.
Caller must have appropriate privilege.
.It Dv SIOCSIFFLAGS
Change interface flags. Caller must have appropriate privilege. If
requested a change to the IFF_UP flag is requested,