[dpdk-dev] [PATCH] app/testpmd: add support for forced ethernet speed
Ajit Khaparde
ajit.khaparde at broadcom.com
Fri Mar 5 05:15:09 CET 2021
On Thu, Feb 25, 2021 at 10:25 AM Ferruh Yigit <ferruh.yigit at intel.com>
wrote:
> On 2/22/2021 7:18 PM, Ajit Khaparde wrote:
> > Add support for forced ethernet speed setting.
> > Currently testpmd tries to configure the Ethernet port in autoneg mode.
> > It is not possible to set the Ethernet port to a specific speed while
> > starting testpmd. In some cases capability to configure a forced speed
> > for the Ethernet port during initialization may be necessary. This patch
> > tries to add this support.
> >
> > The patch assumes full duplex setting and does not attempt to change
> that.
> > So speeds like 10M, 100M are not configurable using this method.
> >
> > The command line to configure a forced speed of 10G:
> > dpdk-testpmd -c 0xff -- -i --eth-link-speed 10000
> >
> > The command line to configure a forced speed of 50G:
> > dpdk-testpmd -c 0xff -- -i --eth-link-speed 50000
> >
> > Signed-off-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
> > ---
> > app/test-pmd/parameters.c | 42 +++++++++++++++++++++++++++
> > app/test-pmd/testpmd.c | 4 +++
> > app/test-pmd/testpmd.h | 1 +
> > doc/guides/testpmd_app_ug/run_app.rst | 11 +++++++
> > 4 files changed, 58 insertions(+)
>
> Can you also update the release notes to document the new parameter?
>
Done
>
> >
> > diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
> > index c8acd5d1b7..e10f7d38fb 100644
> > --- a/app/test-pmd/parameters.c
> > +++ b/app/test-pmd/parameters.c
> > @@ -224,6 +224,7 @@ usage(char* progname)
> > printf(" --hairpin-mode=0xXX: bitmask set the hairpin port
> mode.\n "
> > " 0x10 - explicit Tx rule, 0x02 - hairpin ports paired\n"
> > " 0x01 - hairpin ports loop, 0x00 - hairpin port
> self\n");
> > + printf(" --eth-link-speed: forced link speed.\n");
> > }
> >
> > #ifdef RTE_LIB_CMDLINE
> > @@ -485,6 +486,41 @@ parse_event_printing_config(const char *optarg, int
> enable)
> > return 0;
> > }
> >
> > +static int
> > +parse_link_speed(int n)
> > +{
> > + uint32_t speed;
> > +
> > + switch (n) {
>
> OK to not support "10M, 100M", not sure if anybody really uses them, but
> what do
> you think checking them and return an error?
>
Ok. Added this.
>
> > + case 1000:
> > + speed = ETH_LINK_SPEED_1G;
> > + break;
> > + case 10000:
> > + speed = ETH_LINK_SPEED_10G;
> > + break;
> > + case 25000:
> > + speed = ETH_LINK_SPEED_25G;
> > + break;
> > + case 40000:
> > + speed = ETH_LINK_SPEED_40G;
> > + break;
> > + case 50000:
> > + speed = ETH_LINK_SPEED_50G;
> > + break;
> > + case 100000:
> > + speed = ETH_LINK_SPEED_100G;
> > + break;
> > + case 200000:
> > + speed = ETH_LINK_SPEED_200G;
> > + break;
> > + default:
> > + speed = ETH_LINK_SPEED_AUTONEG;
> > + break;
>
> Isn't this function to set a fixed link speed, why falling back to autoneg?
>
Good point. I removed it.
>
> Also shouldn't this function set 'ETH_LINK_SPEED_FIXED' too?
>
Yes. Done in v2.
>
> > + }
> > +
> > + return speed;
> > +}
> > +
> > void
> > launch_args_parse(int argc, char** argv)
> > {
> > @@ -605,6 +641,7 @@ launch_args_parse(int argc, char** argv)
> > { "rx-mq-mode", 1, 0, 0 },
> > { "record-core-cycles", 0, 0, 0 },
> > { "record-burst-stats", 0, 0, 0 },
> > + { "eth-link-speed", 1, 0, 0 },
> > { 0, 0, 0, 0 },
> > };
> >
> > @@ -1366,6 +1403,11 @@ launch_args_parse(int argc, char** argv)
> > record_core_cycles = 1;
> > if (!strcmp(lgopts[opt_idx].name,
> "record-burst-stats"))
> > record_burst_stats = 1;
> > + if (!strcmp(lgopts[opt_idx].name,
> "eth-link-speed")) {
> > + n = atoi(optarg);
> > + if (n >= 0 && parse_link_speed(n) >= 0)
> > + eth_link_speed =
> parse_link_speed(n);
> > + }
> > break;
> > case 'h':
> > usage(argv[0]);
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
> > index caa711d6f3..9434e335a0 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -535,6 +535,8 @@ uint16_t gso_max_segment_size = RTE_ETHER_MAX_LEN -
> RTE_ETHER_CRC_LEN;
> > /* Holds the registered mbuf dynamic flags names. */
> > char dynf_names[64][RTE_MBUF_DYN_NAMESIZE];
> >
> > +uint32_t eth_link_speed;
> > +
>
> Can you please move this a little up, at the beginning of the 'testpmd.c'
> there
> are global config variables, this can go next to them.
>
Done in v2.
>
> And can you please add a single line comment to the variable, as done in
> all
> other ones.
>
Sure. Done in v2.
>
> > /*
> > * Helper function to check if socket is already discovered.
> > * If yes, return positive value. If not, return zero.
> > @@ -1484,6 +1486,8 @@ init_config(void)
> > port->tx_conf[k].offloads =
> > port->dev_conf.txmode.offloads;
> >
> > + port->dev_conf.link_speeds = eth_link_speed;
> > +
>
> This is set even user doesn't provide '--eth-link-speed' at all, in that
> case I
> assume it relies on the fact that variable default value (0) is the same
> as
> 'AUTONEG' value (0). So it sets speed to autoneg in that case.
> But what do you think to be more explicit, and set this only if the user
> provided the device argument, like:
> if (eth_link_speed)
> port->dev_conf.link_speeds = eth_link_speed;
>
Done in v2.
>
>
> This sets the same link speed for all ports, do you think may we need
> capability
> to set link speed per port? Does it worth the complexity it brings?
>
It is turning out to be a bit complex. For this round I think let's keep it
simple.
>
> > /* set flag to initialize port/queue */
> > port->need_reconfig = 1;
> > port->need_reconfig_queues = 1;
> > diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
> > index 60ddeb8f13..a3cd4a0e16 100644
> > --- a/app/test-pmd/testpmd.h
> > +++ b/app/test-pmd/testpmd.h
> > @@ -351,6 +351,7 @@ extern bool setup_on_probe_event; /**< disabled by
> port setup-on iterator */
> > extern uint8_t hot_plug; /**< enable by "--hot-plug" parameter */
> > extern int do_mlockall; /**< set by "--mlockall" or "--no-mlockall"
> parameter */
> > extern uint8_t clear_ptypes; /**< disabled by set ptype cmd */
> > +extern uint32_t eth_link_speed;
> >
> > #ifdef RTE_LIBRTE_IXGBE_BYPASS
> > extern uint32_t bypass_timeout; /**< Store the NIC bypass watchdog
> timeout */
> > diff --git a/doc/guides/testpmd_app_ug/run_app.rst
> b/doc/guides/testpmd_app_ug/run_app.rst
> > index 6745072329..a856f52736 100644
> > --- a/doc/guides/testpmd_app_ug/run_app.rst
> > +++ b/doc/guides/testpmd_app_ug/run_app.rst
> > @@ -536,3 +536,14 @@ The command line options are:
> > bit 1 - two hairpin ports paired
> > bit 0 - two hairpin ports loop
> > The default value is 0. Hairpin will use single port mode and
> implicit Tx flow mode.
> > +
> > +* ``--eth-link-speed``
> > +
>
> Should this document that "10M, 100M" is not supported?
>
Done in v2.
>
> > + Set a forced link speed to the ethernet port.
> > + 1000 - 1Gbps
> > + 10000 - 10Gbps
> > + 25000 - 25Gbps
> > + 40000 - 40Gbps
> > + 50000 - 50Gbps
> > + 100000 - 100Gbps
> > + 200000 - 200Gbps
>
> What do you think to put something like "..." to very bottom, to clarify
> this is
> not full list, so that we won't need to update this each time we add a new
> speed?
>
Done.
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