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DEVLINK-SB(8)                        Linux                       DEVLINK-SB(8)
NAME
       devlink-sb - devlink shared buffer configuration
SYNOPSIS
       devlink [ OPTIONS ] sb  { COMMAND | help }
       OPTIONS := { -V[ersion] | -n[no-nice-names] }
       devlink sb show [ DEV [ sb SB_INDEX ] ]
       devlink sb pool show [ DEV [ sb SB_INDEX ]
               pool POOL_INDEX ]
       devlink sb pool set DEV [ sb SB_INDEX ]
               pool POOL_INDEX
               size POOL_SIZE
               thtype { static | dynamic }
       devlink sb port pool show [ DEV/PORT_INDEX [ sb SB_INDEX ]
               pool POOL_INDEX ]
       devlink sb port pool set DEV/PORT_INDEX [ sb SB_INDEX ]
               pool POOL_INDEX
               th THRESHOLD
       devlink sb tc bind show [ DEV/PORT_INDEX [ sb SB_INDEX ]
               tc TC_INDEX
               type { ingress | egress } ]
       devlink sb tc bind set DEV/PORT_INDEX [ sb SB_INDEX ]
               tc TC_INDEX
               type { ingress | egress }
               pool POOL_INDEX
               th THRESHOLD
       devlink sb occupancy show { DEV | DEV/PORT_INDEX } [ sb SB_INDEX ]
       devlink sb occupancy snapshot DEV [ sb SB_INDEX ]
       devlink sb occupancy clearmax DEV [ sb SB_INDEX ]
       devlink sb help
DESCRIPTION
   devlink sb show - display available shared buffers and their attributes
       DEV - specifies the devlink device to show shared buffers.  If this
       argument is omitted all shared buffers of all devices are listed.
       SB_INDEX - specifies the shared buffer.  If this argument is omitted
       shared buffer with index 0 is selected.  Behaviour of this argument it
       the same for every command.
   devlink sb pool show - display available pools and their attributes
       DEV - specifies the devlink device to show pools.  If this argument is
       omitted all pools of all devices are listed.
       Display available pools listing their type, size, thtype and cell_size.
       cell_size is the allocation granularity of memory within the shared
       buffer. Drivers may round up, round down or reject size passed to the
       set command if it is not multiple of cell_size.
   devlink sb pool set - set attributes of pool
       DEV - specifies the devlink device to set pool.
       size POOL_SIZE
              size of the pool in Bytes.
       thtype { static | dynamic }
              pool threshold type.
              static - Threshold values for the pool will be passed in Bytes.
              dynamic - Threshold values ("to_alpha") for the pool will be
              used to compute alpha parameter according to formula:
                              alpha = 2 ^ (to_alpha - 10)
                        The range of the passed value is between 0 to 20. The
                        computed alpha is used to determine the maximum usage
                        of the flow:
                              max_usage = alpha / (1 + alpha) * Free_Buffer
   devlink sb port pool show - display port-pool combinations and threshold
       for each
       DEV/PORT_INDEX - specifies the devlink port.
       pool POOL_INDEX
              pool index.
   devlink sb port pool set - set port-pool threshold
       DEV/PORT_INDEX - specifies the devlink port.
       pool POOL_INDEX
              pool index.
       th THRESHOLD
              threshold value. Type of the value is either Bytes or
              "to_alpha", depends on thtype set for the pool.
   devlink sb tc bind show - display port-TC to pool bindings and threshold
       for each
       DEV/PORT_INDEX - specifies the devlink port.
       tc TC_INDEX
              index of either ingress or egress TC, usually in range 0 to 8
              (depends on device).
       type { ingress | egress }
              TC type.
   devlink sb tc bind set - set port-TC to pool binding with specified thresh-
       old
       DEV/PORT_INDEX - specifies the devlink port.
       tc TC_INDEX
              index of either ingress or egress TC, usually in range 0 to 8
              (depends on device).
       type { ingress | egress }
              TC type.
       pool POOL_INDEX
              index of pool to bind this to.
       th THRESHOLD
              threshold value. Type of the value is either Bytes or
              "to_alpha", depends on thtype set for the pool.
   devlink sb occupancy show - display shared buffer occupancy values for
       device or port
       This command is used to browse shared buffer occupancy values. Values
       are showed for every port-pool combination as well as for all port-TC
       combinations (with pool this port-TC is bound to). Format of value is:
                       current_value/max_value
       Note that before showing values, one has to issue occupancy snapshot
       command first.
       DEV - specifies the devlink device to show occupancy values for.
       DEV/PORT_INDEX - specifies the devlink port to show occupancy values
       for.
   devlink sb occupancy snapshot - take occupancy snapshot of shared buffer
       for device
       This command is used to take a snapshot of shared buffer occupancy val-
       ues. After that, the values can be showed using occupancy show command.
       DEV - specifies the devlink device to take occupancy snapshot on.
   devlink sb occupancy clearmax - clear occupancy watermarks of shared buffer
       for device
       This command is used to reset maximal occupancy values reached for
       whole device. Note that before browsing reset values, one has to issue
       occupancy snapshot command.
       DEV - specifies the devlink device to clear occupancy watermarks on.
EXAMPLES
       devlink sb show
           List available share buffers.
       devlink sb pool show
           List available pools and their config.
       devlink sb port pool show pci/0000:03:00.0/1 pool 0
           Show port-pool setup for specified port and pool.
       sudo devlink sb port pool set pci/0000:03:00.0/1 pool 0 th 15
           Change threshold for port specified port and pool.
       devlink sb tc bind show pci/0000:03:00.0/1 tc 0 type ingress
           Show pool binding and threshold for specified port and TC.
       sudo devlink sb tc bind set pci/0000:03:00.0/1 tc 0 type ingress pool 0
       th 9
           Set pool binding and threshold for specified port and TC.
       sudo devlink sb occupancy snapshot pci/0000:03:00.0
           Make a snapshot of occupancy of shared buffer for specified devlink
           device.
       devlink sb occupancy show pci/0000:03:00.0/1
           Show occupancy for specified port from the snapshot.
       sudo devlink sb occupancy clearmax pci/0000:03:00.0
           Clear watermarks for shared buffer of specified devlink device.
SEE ALSO
       devlink(8), devlink-dev(8), devlink-port(8), devlink-monitor(8),
AUTHOR
       Jiri Pirko <jiri AT mellanox.com>
iproute2                          14 Apr 2016                    DEVLINK-SB(8)