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Documentation/pktgen: Clearify how-to use pktgen samples

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o Change process name in ps output: looks like, these days the process
  is named kpktgend_<cpu>, rather than pktgen/<cpu>.
o Use pg_ctrl for start/stop as it can work well with pgset without
  changes to $(PGDEV) variable.
o Clarify a bit needed $(PGDEV) definition for sample scripts and that
  one needs to `source functions.sh`.
o Document how-to unset a behaviour flag, note about history expansion.
o Fix pgset spi parameter value.

Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Safonov 2018-01-18 18:31:33 +00:00 committed by David S. Miller
parent 969ade4086
commit d2ee7973c3
1 changed files with 14 additions and 5 deletions
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19
Documentation/networking/pktgen.txt
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@ -12,8 +12,8 @@ suitable sample script and configure that.
On a dual CPU: On a dual CPU:
ps aux | grep pkt ps aux | grep pkt
root 129 0.3 0.0 0 0 ? SW 2003 523:20 [pktgen/0] root 129 0.3 0.0 0 0 ? SW 2003 523:20 [kpktgend_0]
root 130 0.3 0.0 0 0 ? SW 2003 509:50 [pktgen/1] root 130 0.3 0.0 0 0 ? SW 2003 509:50 [kpktgend_1]
For monitoring and control pktgen creates: For monitoring and control pktgen creates:
@ -113,9 +113,16 @@ Configuring devices
=================== ===================
This is done via the /proc interface, and most easily done via pgset This is done via the /proc interface, and most easily done via pgset
as defined in the sample scripts. as defined in the sample scripts.
You need to specify PGDEV environment variable to use functions from sample
scripts, i.e.:
export PGDEV=/proc/net/pktgen/eth4@0
source samples/pktgen/functions.sh
Examples: Examples:
pg_ctrl start starts injection.
pg_ctrl stop aborts injection. Also, ^C aborts generator.
pgset "clone_skb 1" sets the number of copies of the same packet pgset "clone_skb 1" sets the number of copies of the same packet
pgset "clone_skb 0" use single SKB for all transmits pgset "clone_skb 0" use single SKB for all transmits
pgset "burst 8" uses xmit_more API to queue 8 copies of the same pgset "burst 8" uses xmit_more API to queue 8 copies of the same
@ -165,8 +172,12 @@ Examples:
IPSEC # IPsec encapsulation (needs CONFIG_XFRM) IPSEC # IPsec encapsulation (needs CONFIG_XFRM)
NODE_ALLOC # node specific memory allocation NODE_ALLOC # node specific memory allocation
NO_TIMESTAMP # disable timestamping NO_TIMESTAMP # disable timestamping
pgset 'flag ![name]' Clear a flag to determine behaviour.
Note that you might need to use single quote in
interactive mode, so that your shell wouldn't expand
the specified flag as a history command.
pgset spi SPI_VALUE Set specific SA used to transform packet. pgset "spi [SPI_VALUE]" Set specific SA used to transform packet.
pgset "udp_src_min 9" set UDP source port min, If < udp_src_max, then pgset "udp_src_min 9" set UDP source port min, If < udp_src_max, then
cycle through the port range. cycle through the port range.
@ -207,8 +218,6 @@ Examples:
pgset "tos XX" set former IPv4 TOS field (e.g. "tos 28" for AF11 no ECN, default 00) pgset "tos XX" set former IPv4 TOS field (e.g. "tos 28" for AF11 no ECN, default 00)
pgset "traffic_class XX" set former IPv6 TRAFFIC CLASS (e.g. "traffic_class B8" for EF no ECN, default 00) pgset "traffic_class XX" set former IPv6 TRAFFIC CLASS (e.g. "traffic_class B8" for EF no ECN, default 00)
pgset stop aborts injection. Also, ^C aborts generator.
pgset "rate 300M" set rate to 300 Mb/s pgset "rate 300M" set rate to 300 Mb/s
pgset "ratep 1000000" set rate to 1Mpps pgset "ratep 1000000" set rate to 1Mpps