DCB-BUFFER(8)			     Linux			 DCB-BUFFER(8)

NAME
       dcb-buffer - show / manipulate port buffer settings of the DCB (Data
       Center Bridging) subsystem

SYNOPSIS

       dcb [ OPTIONS ]	buffer { COMMAND | help }


       dcb buffer show dev DEV [ prio-buffer ] [ buffer-size ] [ total-size ]

       dcb buffer set dev DEV [ prio-buffer PRIO-MAP ] [ buffer-size SIZE-MAP
	       ]

       PRIO-MAP := [ PRIO-MAP ] PRIO-MAPPING

       PRIO-MAPPING := { PRIO | all }:BUFFER

       SIZE-MAP := [ SIZE-MAP ] SIZE-MAPPING

       SIZE-MAPPING := { BUFFER | all }:SIZE

       PRIO := { 0 .. 7 }

       BUFFER := { 0 .. 7 }

       SIZE := { INTEGER | INTEGERK | INTEGERM | ... }


DESCRIPTION
       dcb buffer is used to configure assignment of traffic to port buffers
       based on traffic priority, and sizes of those buffers. It can be also
       used to inspect the current configuration, as well as total device
       memory that the port buffers take.


PARAMETERS
       For read-write parameters, the following describes only the write
       direction, i.e. as used with the set command. For the show command, the
       parameter name is to be used as a simple keyword without further
       arguments. This instructs the tool to show the value of a given
       parameter. When no parameters are given, the tool shows the complete
       buffer configuration.


       total-size
	      A read-only property that shows the total device memory taken up
	      by port buffers. This might be more than a simple sum of
	      individual buffer sizes if there are any hidden or internal
	      buffers.


       prio-buffer PRIO-MAP
	      PRIO-MAP uses the array parameter syntax, see dcb(8) for
	      details. Keys are priorities, values are buffer indices. For
	      each priority sets a buffer where traffic with that priority is
	      directed to.


       buffer-size SIZE-MAP
	      SIZE-MAP uses the array parameter syntax, see dcb(8) for
	      details. Keys are buffer indices, values are sizes of that
	      buffer in bytes.	The sizes can use the notation documented in
	      section PARAMETERS at tc(8).  Note that the size requested by
	      the tool can be rounded or capped by the driver to satisfy the
	      requirements of the device.


EXAMPLE & USAGE
       Configure the priomap in a one-to-one fashion:


       # dcb buffer set dev eth0 prio-buffer 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7

       Set sizes of all buffers to 10KB, except for buffer 6, which will have
       the size 1MB:


       # dcb buffer set dev eth0 buffer-size all:10K 6:1M

       Show what was set:


       # dcb buffer show dev eth0
       prio-buffer 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
       buffer-size 0:10Kb 1:10Kb 2:10Kb 3:10Kb 4:10Kb 5:10Kb 6:1Mb 7:10Kb
       total-size 1222Kb


EXIT STATUS
       Exit status is 0 if command was successful or a positive integer upon
       failure.


SEE ALSO
       dcb(8)


REPORTING BUGS
       Report any bugs to the Network Developers mailing list
       <netdev@vger.kernel.org> where the development and maintenance is
       primarily done.	You do not have to be subscribed to the list to send a
       message there.


AUTHOR
       Petr Machata <me@pmachata.org>

iproute2		       12 November 2020			 DCB-BUFFER(8)