Subject: Re: [PATCH rdma-next v2 05/17] RDMA/counter: Add set/clear per-port auto mode support

From: Leon Romanovsky <[email-masked]>
Date: Wed, 29 May 2019 13:12:18 +0300

On Wed, May 22, 2019 at 01:56:08PM -0300, Jason Gunthorpe wrote:
> On Mon, Apr 29, 2019 at 11:34:41AM +0300, Leon Romanovsky wrote:
> > From: Mark Zhang <[email-masked]>
> >
> > Add an API to support set/clear per-port auto mode.
> >
> > Signed-off-by: Mark Zhang <[email-masked]>
> > Reviewed-by: Majd Dibbiny <[email-masked]>
> > Signed-off-by: Leon Romanovsky <[email-masked]>
> >  drivers/infiniband/core/Makefile   |  2 +-
> >  drivers/infiniband/core/counters.c | 77 ++++++++++++++++++++++++++++++
> >  drivers/infiniband/core/device.c   |  4 ++
> >  include/rdma/ib_verbs.h            |  2 +
> >  include/rdma/rdma_counter.h        | 24 ++++++++++
> >  include/uapi/rdma/rdma_netlink.h   | 26 ++++++++++
> >  6 files changed, 134 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/infiniband/core/counters.c
> >
> > diff --git a/drivers/infiniband/core/Makefile b/drivers/infiniband/core/Makefile
> > index 313f2349b518..cddf748c15c9 100644
> > +++ b/drivers/infiniband/core/Makefile
> > @@ -12,7 +12,7 @@ ib_core-y :=			packer.o ud_header.o verbs.o cq.o rw.o sysfs.o \
> >  				device.o fmr_pool.o cache.o netlink.o \
> >  				roce_gid_mgmt.o mr_pool.o addr.o sa_query.o \
> >  				multicast.o mad.o smi.o agent.o mad_rmpp.o \
> > -				nldev.o restrack.o
> > +				nldev.o restrack.o counters.o
> >
> >  ib_core-$(CONFIG_SECURITY_INFINIBAND) += security.o
> >  ib_core-$(CONFIG_CGROUP_RDMA) += cgroup.o
> > diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c
> > new file mode 100644
> > index 000000000000..bda8d945a758
> > +++ b/drivers/infiniband/core/counters.c
> > @@ -0,0 +1,77 @@
> > +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
> > +/*
> > + * Copyright (c) 2019 Mellanox Technologies. All rights reserved.
> > + */
> > +#include <rdma/ib_verbs.h>
> > +#include <rdma/rdma_counter.h>
> > +
> > +#include "core_priv.h"
> > +#include "restrack.h"
> > +
> > +#define ALL_AUTO_MODE_MASKS (RDMA_COUNTER_MASK_QP_TYPE)
> > +
> > +static int __counter_set_mode(struct rdma_counter_mode *curr,
> > +			      enum rdma_nl_counter_mode new_mode,
> > +			      enum rdma_nl_counter_mask new_mask)
> > +{
> > +	if ((new_mode == RDMA_COUNTER_MODE_AUTO) &&
> > +	    ((new_mask & (~ALL_AUTO_MODE_MASKS)) ||
> > +	     (curr->mode != RDMA_COUNTER_MODE_NONE)))
> > +		return -EINVAL;
> > +
> > +	curr->mode = new_mode;
> > +	curr->mask = new_mask;
> > +	return 0;
> > +}
> > +
> > +/**
> > + * rdma_counter_set_auto_mode() - Turn on/off per-port auto mode
> > + *
> > + * When @on is true, the @mask must be set
> > + */
> > +int rdma_counter_set_auto_mode(struct ib_device *dev, u8 port,
> > +			       bool on, enum rdma_nl_counter_mask mask)
> > +{
> > +	struct rdma_port_counter *port_counter;
> > +	int ret;
> > +
> > +	if (!rdma_is_port_valid(dev, port))
> > +		return -EINVAL;
> > +
> > +	port_counter = &dev->port_data[port].port_counter;
> > +	mutex_lock(&port_counter->lock);
> > +	if (on) {
> > +		ret = __counter_set_mode(&port_counter->mode,
> > +					 RDMA_COUNTER_MODE_AUTO, mask);
> > +	} else {
> > +		if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO) {
> > +			ret = -EINVAL;
> > +			goto out;
> > +		}
> > +		ret = __counter_set_mode(&port_counter->mode,
> > +					 RDMA_COUNTER_MODE_NONE, 0);
> > +	}
> > +
> > +out:
> > +	mutex_unlock(&port_counter->lock);
> > +	return ret;
> > +}
> > +
> > +void rdma_counter_init(struct ib_device *dev)
> > +{
> > +	struct rdma_port_counter *port_counter;
> > +	u32 port;
> > +
> > +	if (!dev->ops.alloc_hw_stats)
> > +		return;
> > +
> > +	rdma_for_each_port(dev, port) {
> > +		port_counter = &dev->port_data[port].port_counter;
> > +		port_counter->mode.mode = RDMA_COUNTER_MODE_NONE;
> > +		mutex_init(&port_counter->lock);
> > +	}
> > +}
> > +
> > +void rdma_counter_cleanup(struct ib_device *dev)
> > +{
> > +}
>
> Please don't add empty functions

It is brought here for symmetry, the function is going to be filled in
patch "RDMA/core: Get sum value of all counters when perform a sysfs
stat read".

>
> > @@ -1304,6 +1307,7 @@ static void __ib_unregister_device(struct ib_device *ib_dev)
> >  		goto out;
> >
> >  	disable_device(ib_dev);
> > +	rdma_counter_cleanup(ib_dev);
>
> This is the wrong place to call this, the patch that actually adds a
> body is just doing kfree's so it is properly called
> 'rdma_counter_release' and it belongs in ib_device_release()

I'll move.

>
> And it shouldn't test hw_stats, and it shouldn't have a 'fail' stanza
> for allocation either.

Not all devices implement hw_stat.

> Jason