[dpdk-dev] [PATCH] net/ixgbe: fix reconfiguration of rx queues
Chas Williams
3chas3 at gmail.com
Mon Jan 29 17:49:23 CET 2018
On Mon, Jan 29, 2018 at 11:25 AM, Ananyev, Konstantin <
konstantin.ananyev at intel.com> wrote:
>
> > -----Original Message-----
> > From: Chas Williams [mailto:3chas3 at gmail.com]
> > Sent: Monday, January 29, 2018 3:21 PM
> > To: dev at dpdk.org
> > Cc: Lu, Wenzhuo <wenzhuo.lu at intel.com>; Ananyev, Konstantin <
> konstantin.ananyev at intel.com>; Charles (Chas) Williams
> > <chas3 at att.com>
> > Subject: [PATCH] net/ixgbe: fix reconfiguration of rx queues
> >
> > From: "Charles (Chas) Williams" <chas3 at att.com>
> >
> > .dev_configure() may be called again after RX queues have been setup.
> > This has the effect of clearing whatever setting the RX queues made for
> > rx_bulk_alloc_allowed or rx_vec_allowed. Only reset this configuration
> > is there aren't any currently allocated queues.
> >
> > Fixes: 01fa1d6215fa ("ixgbe: unify Rx setup")
> >
> > Signed-off-by: Chas Williams <chas3 at att.com>
> > ---
> > drivers/net/ixgbe/ixgbe_ethdev.c | 18 ++++++++++++++++--
> > 1 file changed, 16 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_
> ethdev.c
> > index 37eb668..b39249a 100644
> > --- a/drivers/net/ixgbe/ixgbe_ethdev.c
> > +++ b/drivers/net/ixgbe/ixgbe_ethdev.c
> > @@ -2348,6 +2348,7 @@ ixgbe_dev_configure(struct rte_eth_dev *dev)
> > struct ixgbe_adapter *adapter =
> > (struct ixgbe_adapter *)dev->data->dev_private;
> > int ret;
> > + uint16_t i;
> >
> > PMD_INIT_FUNC_TRACE();
> > /* multipe queue mode checking */
> > @@ -2363,11 +2364,17 @@ ixgbe_dev_configure(struct rte_eth_dev *dev)
> >
> > /*
> > * Initialize to TRUE. If any of Rx queues doesn't meet the bulk
> > - * allocation or vector Rx preconditions we will reset it.
> > + * allocation or vector Rx preconditions we will reset it. We
> > + * can only do this is there aren't any existing RX queues.
> > */
> > + for (i = 0; i < dev->data->nb_rx_queues; i++) {
> > + if (dev->data->rx_queues[i])
> > + goto out;
> > + }
>
> I don't see why this is needed.
> It surely should be possible to reconfigure device with different
> number of queues.
> Konstantin
>
Yes, you can add new queues but you shouldn't reset the bulk and vec
settings
that have already been chosen by the previously allocated queues. If those
queues
set rx_bulk_alloc_allowed to be false, then this is going to cause an issue
with queue
release later on. This breaks:
rte_eth_dev_configure(..., 1, 1, ...);
rx_queue_setup(1)
[rx_queue_setup decides that it can't support rx_bulk_alloc_allowed]
..
Later, you want to add some more queues, you call
eth_eth_dev_configure(..., 2, 2, ...);
rx_queue_setup(2)
[rx_queue_setup hopefully makes the same choice as rxqid = 1?]
...
Is one supposed to release all queues before calling
rte_eth_dev_configure()? If
that is true, it seems like the change_mtu examples I see are possibly
wrong. As
suggested in kenrel_nic_interface.rst:
ret = rte_eth_dev_configure(port_id, 1, 1, &conf);
if (ret < 0) {
RTE_LOG(ERR, APP, "Fail to reconfigure port %d\n", port_id);
return ret;
}
/* Restart specific port */
ret = rte_eth_dev_start(port_id);
if (ret < 0) {
RTE_LOG(ERR, APP, "Fail to restart port %d\n", port_id);
return ret;
}
This is will obviously reset the rx_bulk_alloc_allowed and not reallocated
the RX queues.
>
> > adapter->rx_bulk_alloc_allowed = true;
> > adapter->rx_vec_allowed = true;
> >
> > +out:
> > return 0;
> > }
> >
> > @@ -4959,6 +4966,7 @@ ixgbevf_dev_configure(struct rte_eth_dev *dev)
> > struct rte_eth_conf *conf = &dev->data->dev_conf;
> > struct ixgbe_adapter *adapter =
> > (struct ixgbe_adapter *)dev->data->dev_private;
> > + uint16_t i;
> >
> > PMD_INIT_LOG(DEBUG, "Configured Virtual Function port id: %d",
> > dev->data->port_id);
> > @@ -4981,11 +4989,17 @@ ixgbevf_dev_configure(struct rte_eth_dev *dev)
> >
> > /*
> > * Initialize to TRUE. If any of Rx queues doesn't meet the bulk
> > - * allocation or vector Rx preconditions we will reset it.
> > + * allocation or vector Rx preconditions we will reset it. We
> > + * can only do this is there aren't any existing RX queues.
> > */
> > + for (i = 0; i < dev->data->nb_rx_queues; i++) {
> > + if (dev->data->rx_queues[i])
> > + goto out;
> > + }
> > adapter->rx_bulk_alloc_allowed = true;
> > adapter->rx_vec_allowed = true;
> >
> > +out:
> > return 0;
> > }
> >
> > --
> > 2.9.5
>
>
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