From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: "Ergin, Mesut A" <mesut.a.ergin@intel.com>,
"Xing, Beilei" <beilei.xing@intel.com>,
"Zhang, Qi Z" <qi.z.zhang@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 2/3] net/i40e: add runtime option to disable vector rx
Date: Mon, 20 May 2019 23:11:03 +0000 [thread overview]
Message-ID: <2601191342CEEE43887BDE71AB9772580161636445@irsmsx105.ger.corp.intel.com> (raw)
In-Reply-To: <3615B82CA151CF42A86EDDD9846A8B38C7A838E6@ORSMSX112.amr.corp.intel.com>
> >
> > Hi
> >
> > >
> > > Vector RX functions are not at feature parity with non-vector ones and
> > > currently the vector RX path is enabled by default. Hence, the only
> > > option to force selection of non-vector variants and be able to retain
> > > functionality is to disable vector PMD globally at compile time via the
> > > config file option.
> > >
> > > This patch introduces a new runtime device config option named
> > > disable-vec-rx to allow users to limit the driver to make a choice among
> > > non-vector RX functions, on a per device basis. This runtime option
> > > defaults to a value of zero, allowing vector RX functions to be
> > > selected (current behavior). When disable-vec-rx=1 is specified for a
> > > device, even if all the other requirements to select a vector RX
> > > function are satisfied, the driver will still pick one out of the
> > > appropriate non-vector RX functions.
> >
> > Not sure I understand the logic of that patch.
> > If i40e RX PMD selects wrong RX function that doesn't provide
> > requested by user functionality (which one?) -
> > then it is a bug in i40e RX function selection code that needs to be fixed.
> > No point to introduce some new config options for that.
> > Konstantin
> >
> Current design of RX function selection for the PMDs make it an
> initialization time deal. However, the first rte_flow request (thus the need
> to enable FD / RTE_FDIR_MODE_PERFECT) may come in at any point in
> time, well after the RX function was selected (e.g., OVS does this when the
> first packet that can be offloaded arrives). The design in this patch gives
> such applications a choice to restrict possible RX functions to non-vector
> paths proactively.
If you plan to use FD mode on your device, why not enable it
at setup phase via rte_eth_dev_configure()?
Then proper rx function would be selected.
>
> > >
> > > Signed-off-by: Mesut Ali Ergin <mesut.a.ergin@intel.com>
> > > ---
> > > doc/guides/nics/i40e.rst | 14 +++++++++
> > > drivers/net/i40e/i40e_ethdev.c | 70
> > +++++++++++++++++++++++++++++++++++++++++-
> > > drivers/net/i40e/i40e_ethdev.h | 1 +
> > > drivers/net/i40e/i40e_rxtx.c | 4 +++
> > > 4 files changed, 88 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
> > > index a97484c..532cc64 100644
> > > --- a/doc/guides/nics/i40e.rst
> > > +++ b/doc/guides/nics/i40e.rst
> > > @@ -183,6 +183,20 @@ Runtime Config Options
> > >
> > > -w 84:00.0,use-latest-supported-vec=1
> > >
> > > +- ``Disable RX Vector Functions `` (default ``vector RX enabled``)
> > > +
> > > + When config file option for the vector PMD is enabled, vector RX functions
> > may
> > > + be the default choice of the driver at device initialization time, if certain
> > > + conditions apply. However, vector RX functions may not always be at
> > feature
> > > + parity with non-vector ones. In order to allow users to override vector RX
> > > + function selection behavior at runtime, the ``devargs`` parameter
> > > + ``disable-vec-rx`` is introduced, such that
> > > +
> > > + -w DBDF,disable-vec-rx=1
> > > +
> > > + would force driver to limit its choices to non-vector RX function variants for
> > > + the device specified by the DBDF.
> > > +
> > > Vector RX Pre-conditions
> > > ~~~~~~~~~~~~~~~~~~~~~~~~
> > > For Vector RX it is assumed that the number of descriptor rings will be a power
> > > diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> > > index cab440f..19fbd23 100644
> > > --- a/drivers/net/i40e/i40e_ethdev.c
> > > +++ b/drivers/net/i40e/i40e_ethdev.c
> > > @@ -44,6 +44,7 @@
> > > #define ETH_I40E_SUPPORT_MULTI_DRIVER "support-multi-driver"
> > > #define ETH_I40E_QUEUE_NUM_PER_VF_ARG "queue-num-per-vf"
> > > #define ETH_I40E_USE_LATEST_VEC "use-latest-supported-vec"
> > > +#define ETH_I40E_DISABLE_VEC_RX "disable-vec-rx"
> > >
> > > #define I40E_CLEAR_PXE_WAIT_MS 200
> > >
> > > @@ -410,6 +411,7 @@ static const char *const valid_keys[] = {
> > > ETH_I40E_SUPPORT_MULTI_DRIVER,
> > > ETH_I40E_QUEUE_NUM_PER_VF_ARG,
> > > ETH_I40E_USE_LATEST_VEC,
> > > + ETH_I40E_DISABLE_VEC_RX,
> > > NULL};
> > >
> > > static const struct rte_pci_id pci_id_i40e_map[] = {
> > > @@ -1263,6 +1265,68 @@ i40e_use_latest_vec(struct rte_eth_dev *dev)
> > > return 0;
> > > }
> > >
> > > +static int
> > > +i40e_parse_disable_vec_rx_handler(__rte_unused const char *key,
> > > + const char *value,
> > > + void *opaque)
> > > +{
> > > + struct i40e_adapter *ad;
> > > +
> > > + ad = (struct i40e_adapter *)opaque;
> > > +
> > > + switch (atoi(value)) {
> > > + case 0:
> > > + /* Selection of RX vector functions left untouched*/
> > > + break;
> > > + case 1:
> > > + /* Disable RX vector functions as requested*/
> > > + ad->rx_vec_allowed = false;
> > > + break;
> > > + default:
> > > + PMD_DRV_LOG(WARNING, "Value should be 0 or 1, set it as
> > 1!");
> > > + break;
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +int
> > > +i40e_disable_vec_rx(struct rte_eth_dev *dev)
> > > +{
> > > + struct i40e_adapter *ad =
> > > + I40E_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
> > > + struct rte_kvargs *kvlist;
> > > + int kvargs_count;
> > > +
> > > +
> > > + if (!dev->device->devargs)
> > > + return 0;
> > > +
> > > + kvlist = rte_kvargs_parse(dev->device->devargs->args, valid_keys);
> > > + if (!kvlist)
> > > + return -EINVAL;
> > > +
> > > + kvargs_count = rte_kvargs_count(kvlist, ETH_I40E_DISABLE_VEC_RX);
> > > + if (!kvargs_count) {
> > > + rte_kvargs_free(kvlist);
> > > + return 0;
> > > + }
> > > +
> > > + if (kvargs_count > 1)
> > > + PMD_DRV_LOG(WARNING, "More than one argument \"%s\"
> > and only "
> > > + "the first invalid or last valid one is used !",
> > > + ETH_I40E_DISABLE_VEC_RX);
> > > +
> > > + if (rte_kvargs_process(kvlist, ETH_I40E_DISABLE_VEC_RX,
> > > + i40e_parse_disable_vec_rx_handler, ad) < 0) {
> > > + rte_kvargs_free(kvlist);
> > > + return -EINVAL;
> > > + }
> > > +
> > > + rte_kvargs_free(kvlist);
> > > + return 0;
> > > +}
> > > +
> > > #define I40E_ALARM_INTERVAL 50000 /* us */
> > >
> > > static int
> > > @@ -1795,6 +1859,9 @@ i40e_dev_configure(struct rte_eth_dev *dev)
> > > ad->tx_simple_allowed = true;
> > > ad->tx_vec_allowed = true;
> > >
> > > + /* Check if users wanted to disable vector RX functions */
> > > + i40e_disable_vec_rx(dev);
> > > +
> > > /* Only legacy filter API needs the following fdir config. So when the
> > > * legacy filter API is deprecated, the following codes should also be
> > > * removed.
> > > @@ -12790,4 +12857,5 @@ RTE_PMD_REGISTER_PARAM_STRING(net_i40e,
> > > ETH_I40E_FLOATING_VEB_LIST_ARG "=<string>"
> > > ETH_I40E_QUEUE_NUM_PER_VF_ARG
> > "=1|2|4|8|16"
> > > ETH_I40E_SUPPORT_MULTI_DRIVER "=1"
> > > - ETH_I40E_USE_LATEST_VEC "=0|1");
> > > + ETH_I40E_USE_LATEST_VEC "=0|1"
> > > + ETH_I40E_DISABLE_VEC_RX "=0|1");
> > > diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
> > > index 9855038..906bfe9 100644
> > > --- a/drivers/net/i40e/i40e_ethdev.h
> > > +++ b/drivers/net/i40e/i40e_ethdev.h
> > > @@ -1248,6 +1248,7 @@ int i40e_config_rss_filter(struct i40e_pf *pf,
> > > struct i40e_rte_flow_rss_conf *conf, bool add);
> > > int i40e_vf_representor_init(struct rte_eth_dev *ethdev, void *init_params);
> > > int i40e_vf_representor_uninit(struct rte_eth_dev *ethdev);
> > > +int i40e_disable_vec_rx(struct rte_eth_dev *dev);
> > >
> > > #define I40E_DEV_TO_PCI(eth_dev) \
> > > RTE_DEV_TO_PCI((eth_dev)->device)
> > > diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
> > > index 1489552..7e66f59 100644
> > > --- a/drivers/net/i40e/i40e_rxtx.c
> > > +++ b/drivers/net/i40e/i40e_rxtx.c
> > > @@ -1736,6 +1736,10 @@ i40e_dev_rx_queue_setup_runtime(struct
> > rte_eth_dev *dev,
> > > */
> > > ad->rx_bulk_alloc_allowed = true;
> > > ad->rx_vec_allowed = true;
> > > +
> > > + /* Check if users wanted to disable vector RX functions */
> > > + i40e_disable_vec_rx(dev);
> > > +
> > > dev->data->scattered_rx = use_scattered_rx;
> > > if (use_def_burst_func)
> > > ad->rx_bulk_alloc_allowed = false;
> > > --
> > > 2.7.4
next prev parent reply other threads:[~2019-05-20 23:11 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-16 4:28 [dpdk-dev] [PATCH 0/3] net/i40e: improve rte_flow offload with MARK + RSS Mesut Ali Ergin
2019-05-16 4:28 ` Mesut Ali Ergin
2019-05-16 4:28 ` [dpdk-dev] [PATCH 1/3] net/i40e: add support for MARK + RSS action in rte_flow Mesut Ali Ergin
2019-05-16 4:28 ` Mesut Ali Ergin
2019-05-22 12:30 ` Zhang, Qi Z
2019-05-16 4:28 ` [dpdk-dev] [PATCH 2/3] net/i40e: add runtime option to disable vector rx Mesut Ali Ergin
2019-05-16 4:28 ` Mesut Ali Ergin
2019-05-16 8:17 ` Maxime Coquelin
2019-05-16 8:17 ` Maxime Coquelin
2019-05-16 21:26 ` Ergin, Mesut A
2019-05-20 8:29 ` Ananyev, Konstantin
2019-05-20 17:53 ` Ergin, Mesut A
2019-05-20 23:11 ` Ananyev, Konstantin [this message]
2019-05-21 16:33 ` Ergin, Mesut A
2019-05-21 17:20 ` Ananyev, Konstantin
2019-05-21 20:55 ` Ergin, Mesut A
2019-05-22 11:01 ` Ananyev, Konstantin
2019-05-22 14:05 ` Thomas Monjalon
2019-05-22 14:32 ` Zhang, Qi Z
2019-05-23 13:10 ` Jerin Jacob Kollanukkaran
2019-05-23 17:54 ` Ergin, Mesut A
2019-05-16 4:28 ` [dpdk-dev] [PATCH 3/3] net/i40e: fix inadvertent override of vector RX allowance Mesut Ali Ergin
2019-05-16 4:28 ` Mesut Ali Ergin
2019-05-16 8:17 ` Maxime Coquelin
2019-05-16 8:17 ` Maxime Coquelin
2019-05-16 20:57 ` Ergin, Mesut A
2019-05-22 12:42 ` Zhang, Qi Z
2019-05-23 18:25 ` Ergin, Mesut A
2019-05-24 2:39 ` Zhang, Qi Z
2019-05-24 18:08 ` Ergin, Mesut A
2019-05-25 11:29 ` Zhang, Qi Z
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