Hi,
> -----Original Message-----
> From: Gaëtan Rivet <gaetan.ri...@6wind.com>
> Sent: Tuesday, March 5, 2019 6:49 PM
> To: Raslan Darawsheh <rasl...@mellanox.com>
> Cc: dev@dpdk.org; Thomas Monjalon <tho...@monjalon.net>;
> step...@networkplumber.org
> Subject: Re: [PATCH v2 2/4] net/failsafe: change back-reference from sub-
> device
>
> Beside the squash referenced in p1,
>
> On Tue, Mar 05, 2019 at 09:52:05AM +0000, Raslan Darawsheh wrote:
> > In multiprocess context, the sub-device structure is shared between
> > processes. The reference to the failsafe device was a per process
> > pointer. It's changed to port id which is the same for all processes.
> >
> > Signed-off-by: Raslan Darawsheh <rasl...@mellanox.com>
> > Signed-off-by: Thomas Monjalon <tho...@monjalon.net>
> > ---
> > v2: changed macro to an inline function
> > ---
> > drivers/net/failsafe/failsafe_eal.c | 2 +-
> > drivers/net/failsafe/failsafe_ether.c | 15 ++++++++-------
> > drivers/net/failsafe/failsafe_intr.c | 10 +++++-----
> > drivers/net/failsafe/failsafe_private.h | 13 ++++++++++---
> > 4 files changed, 24 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/net/failsafe/failsafe_eal.c
> > b/drivers/net/failsafe/failsafe_eal.c
> > index 8a888b1..56d1669 100644
> > --- a/drivers/net/failsafe/failsafe_eal.c
> > +++ b/drivers/net/failsafe/failsafe_eal.c
> > @@ -114,7 +114,7 @@ fs_bus_init(struct rte_eth_dev *dev)
> > }
> > ETH(sdev) = &rte_eth_devices[pid];
> > SUB_ID(sdev) = i;
> > - sdev->fs_dev = dev;
> > + sdev->fs_port_id = dev->data->port_id;
> > sdev->dev = ETH(sdev)->device;
> > sdev->state = DEV_PROBED;
> > }
> > diff --git a/drivers/net/failsafe/failsafe_ether.c
> > b/drivers/net/failsafe/failsafe_ether.c
> > index 1783165..d5b1488 100644
> > --- a/drivers/net/failsafe/failsafe_ether.c
> > +++ b/drivers/net/failsafe/failsafe_ether.c
> > @@ -298,7 +298,7 @@ fs_dev_remove(struct sub_device *sdev)
> > break;
> > }
> > sdev->remove = 0;
> > - failsafe_hotplug_alarm_install(sdev->fs_dev);
> > + failsafe_hotplug_alarm_install(fsdev_from_subdev(sdev));
> > }
> >
> > static void
> > @@ -318,8 +318,9 @@ fs_dev_stats_save(struct sub_device *sdev)
> > WARN("Using latest snapshot taken before
> %"PRIu64" seconds.\n",
> > (rte_rdtsc() - timestamp) /
> rte_get_tsc_hz());
> > }
> > - failsafe_stats_increment(&PRIV(sdev->fs_dev)->stats_accumulator,
> > - err ? &sdev->stats_snapshot.stats : &stats);
> > + failsafe_stats_increment
> > + (&PRIV(fsdev_from_subdev(sdev))->stats_accumulator,
> > + err ? &sdev->stats_snapshot.stats : &stats);
> > memset(&sdev->stats_snapshot, 0, sizeof(sdev->stats_snapshot));
> }
> >
> > @@ -566,17 +567,17 @@ failsafe_eth_rmv_event_callback(uint16_t
> port_id
> > __rte_unused, {
> > struct sub_device *sdev = cb_arg;
> >
> > - fs_lock(sdev->fs_dev, 0);
> > + fs_lock(fsdev_from_subdev(sdev), 0);
> > /* Switch as soon as possible tx_dev. */
> > - fs_switch_dev(sdev->fs_dev, sdev);
> > + fs_switch_dev(fsdev_from_subdev(sdev), sdev);
> > /* Use safe bursts in any case. */
> > - failsafe_set_burst_fn(sdev->fs_dev, 1);
> > + failsafe_set_burst_fn(fsdev_from_subdev(sdev), 1);
> > /*
> > * Async removal, the sub-PMD will try to unregister
> > * the callback at the source of the current thread context.
> > */
> > sdev->remove = 1;
> > - fs_unlock(sdev->fs_dev, 0);
> > + fs_unlock(fsdev_from_subdev(sdev), 0);
> > return 0;
> > }
> >
> > diff --git a/drivers/net/failsafe/failsafe_intr.c
> > b/drivers/net/failsafe/failsafe_intr.c
> > index 09aa3c6..d372d09 100644
> > --- a/drivers/net/failsafe/failsafe_intr.c
> > +++ b/drivers/net/failsafe/failsafe_intr.c
> > @@ -274,14 +274,14 @@ failsafe_eth_rx_intr_ctl_subdevice(struct
> sub_device *sdev, int op)
> > int rc;
> > int ret = 0;
> >
> > + fsdev = fsdev_from_subdev(sdev);
> > if (sdev == NULL || (ETH(sdev) == NULL) ||
> > - sdev->fs_dev == NULL || (PRIV(sdev->fs_dev) == NULL)) {
> > + fsdev == NULL || (PRIV(fsdev) == NULL)) {
> > ERROR("Called with invalid arguments");
> > return -EINVAL;
> > }
> > dev = ETH(sdev);
> > - fsdev = sdev->fs_dev;
> > - epfd = PRIV(sdev->fs_dev)->rxp.efd;
> > + epfd = PRIV(fsdev)->rxp.efd;
> > pid = PORT_ID(sdev);
> >
> > if (epfd <= 0) {
> > @@ -330,7 +330,7 @@ int failsafe_rx_intr_install_subdevice(struct
> sub_device *sdev)
> > const struct rte_intr_conf *const intr_conf =
> > Ð(sdev)->data->dev_conf.intr_conf;
> >
> > - fsdev = sdev->fs_dev;
> > + fsdev = fsdev_from_subdev(sdev);
> > rxq = (struct rxq **)fsdev->data->rx_queues;
> > if (intr_conf->rxq == 0)
> > return 0;
> > @@ -368,7 +368,7 @@ void failsafe_rx_intr_uninstall_subdevice(struct
> sub_device *sdev)
> > struct rte_eth_dev *fsdev;
> > struct rxq *fsrxq;
> >
> > - fsdev = sdev->fs_dev;
> > + fsdev = fsdev_from_subdev(sdev);
> > for (qid = 0; qid < ETH(sdev)->data->nb_rx_queues; qid++) {
> > if (qid < fsdev->data->nb_rx_queues) {
> > fsrxq = fsdev->data->rx_queues[qid]; diff --git
> > a/drivers/net/failsafe/failsafe_private.h
> > b/drivers/net/failsafe/failsafe_private.h
> > index 29dfd40..84e847f 100644
> > --- a/drivers/net/failsafe/failsafe_private.h
> > +++ b/drivers/net/failsafe/failsafe_private.h
> > @@ -117,7 +117,7 @@ struct sub_device {
> > /* Others are retrieved through a file descriptor */
> > char *fd_str;
> > /* fail-safe device backreference */
> > - struct rte_eth_dev *fs_dev;
> > + uint16_t fs_port_id; /* shared between processes*/
> > /* flag calling for recollection */
> > volatile unsigned int remove:1;
> > /* flow isolation state */
> > @@ -324,7 +324,8 @@ extern int failsafe_mac_from_arg;
> > */
> > #define FS_ATOMIC_RX(s, i) \
> > rte_atomic64_read( \
> > - &((struct rxq *)((s)->fs_dev->data->rx_queues[i]))->refcnt[(s)->sid]
> \
> > + &((struct rxq *) \
> > + (fsdev_from_subdev(s)->data->rx_queues[i]))->refcnt[(s)->sid] \
> > )
> > /**
> > * s: (struct sub_device *)
> > @@ -332,7 +333,8 @@ extern int failsafe_mac_from_arg;
> > */
> > #define FS_ATOMIC_TX(s, i) \
> > rte_atomic64_read( \
> > - &((struct txq *)((s)->fs_dev->data->tx_queues[i]))->refcnt[(s)->sid]
> \
> > + &((struct txq *) \
> > + (fsdev_from_subdev(s)->data->tx_queues[i]))->refcnt[(s)->sid] \
> > )
> >
> > #ifdef RTE_EXEC_ENV_BSDAPP
> > @@ -379,6 +381,11 @@ fs_find_next(struct rte_eth_dev *dev,
> > return &subs[sid];
> > }
> >
> > +static inline struct rte_eth_dev *
> > +fsdev_from_subdev(struct sub_device *sdev) {
> > + return &rte_eth_devices[sdev->fs_port_id];
> > +}
> > +
>
> Using a static inline that already enforce parameter type makes the
> _from_subdev suffix redundant.
>
> I think
>
> fs_dev(struct sub_device *sdev);
>
> would be more readable in most of the changes above, while keeping with
> the fs_ prefix used in all static failsafe functions.
>
I think you are right if I'm only reading the prototype of the
function/implementation.
But, if I'm reading it from the function call, it would be easier to
read/understand it.
I would change the prefix to be fs_dev_from_subdev instead what do you think?
> > /*
> > * Lock hot-plug mutex.
> > * is_alarm means that the caller is, for sure, the hot-plug alarm
> mechanism.
> > --
> > 2.7.4
> >
>
> --
> Gaëtan Rivet
> 6WIND
Kindest regards,
Raslan Darawsheh
