From: Leon Romanovsky <leon@kernel.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Mark Zhang <markzhang@nvidia.com>,
Doug Ledford <dledford@redhat.com>,
Aharon Landau <aharonl@nvidia.com>,
"David S. Miller" <davem@davemloft.net>,
Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>,
Gal Pressman <galpress@amazon.com>,
Jakub Kicinski <kuba@kernel.org>,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
Maor Gottlieb <maorg@nvidia.com>,
Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>,
Mustafa Ismail <mustafa.ismail@intel.com>,
Naresh Kumar PBS <nareshkumar.pbs@broadcom.com>,
Neta Ostrovsky <netao@nvidia.com>,
netdev@vger.kernel.org, Potnuri Bharat Teja <bharat@chelsio.com>,
Saeed Mahameed <saeedm@nvidia.com>,
Selvin Xavier <selvin.xavier@broadcom.com>,
Shiraz Saleem <shiraz.saleem@intel.com>,
Yishai Hadas <yishaih@nvidia.com>,
Zhu Yanjun <zyjzyj2000@gmail.com>
Subject: Re: [PATCH rdma-next v1 06/11] RDMA/nldev: Add support to get status of all counters
Date: Wed, 29 Sep 2021 15:26:25 +0300 [thread overview]
Message-ID: <YVRbcXJL/LBaSLLJ@unreal> (raw)
In-Reply-To: <20210928115217.GI964074@nvidia.com>
On Tue, Sep 28, 2021 at 08:52:17AM -0300, Jason Gunthorpe wrote:
> On Tue, Sep 28, 2021 at 05:12:39PM +0800, Mark Zhang wrote:
> > On 9/28/2021 1:30 AM, Jason Gunthorpe wrote:
> > > On Wed, Sep 15, 2021 at 02:07:25AM +0300, Leon Romanovsky wrote:
> > > > +static int stat_get_doit_default_counter(struct sk_buff *skb,
> > > > + struct nlmsghdr *nlh,
> > > > + struct netlink_ext_ack *extack,
> > > > + struct nlattr *tb[])
> > > > +{
> > > > + struct rdma_hw_stats *stats;
> > > > + struct ib_device *device;
> > > > + u32 index, port;
> > > > + int ret;
> > > > +
> > > > + if (!tb[RDMA_NLDEV_ATTR_DEV_INDEX] || !tb[RDMA_NLDEV_ATTR_PORT_INDEX])
> > > > + return -EINVAL;
> > > > +
> > > > + index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]);
> > > > + device = ib_device_get_by_index(sock_net(skb->sk), index);
> > > > + if (!device)
> > > > + return -EINVAL;
> > > > +
> > > > + port = nla_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]);
> > > > + if (!rdma_is_port_valid(device, port)) {
> > > > + ret = -EINVAL;
> > > > + goto end;
> > > > + }
> > > > +
> > > > + stats = ib_get_hw_stats_port(device, port);
> > > > + if (!stats) {
> > > > + ret = -EINVAL;
> > > > + goto end;
> > > > + }
> > > > +
> > > > + if (tb[RDMA_NLDEV_ATTR_STAT_HWCOUNTER_DYNAMIC])
> > > > + ret = stat_get_doit_stats_list(skb, nlh, extack, tb,
> > > > + device, port, stats);
> > > > + else
> > > > + ret = stat_get_doit_stats_values(skb, nlh, extack, tb, device,
> > > > + port, stats);
> > >
> > > This seems strange, why is the output of a get contingent on a ignored
> > > input attribute? Shouldn't the HWCOUNTER_DYNAMIC just always be
> > > emitted?
> >
> > The CMD_STAT_GET is originally used to get the default hwcounter statistic
> > (the value of all hwstats), now we also want to use this command to get a
> > list of counters (just name and status), so kernel differentiates these 2
> > cases based on HWCOUNTER_DYNAMIC attr.
>
> Don't do that, it is not how netlink works. Either the whole attribute
> should be returned or you need a new get command
The netlink way is to be independent on returned parameter, if it not
supported, this parameter won't be available at all. This makes HWCOUNTER_DYNAMIC
to work exactly as netlink would do.
Thanks
>
> Jason
next prev parent reply other threads:[~2021-09-29 12:26 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-14 23:07 [PATCH rdma-next v1 00/11] Optional counter statistics support Leon Romanovsky
2021-09-14 23:07 ` [PATCH mlx5-next v1 01/11] net/mlx5: Add ifc bits to support optional counters Leon Romanovsky
2021-09-14 23:07 ` [PATCH mlx5-next v1 02/11] net/mlx5: Add priorities for counters in RDMA namespaces Leon Romanovsky
2021-09-14 23:07 ` [PATCH rdma-next v1 03/11] RDMA/counter: Add a descriptor in struct rdma_hw_stats Leon Romanovsky
2021-09-14 23:07 ` [PATCH rdma-next v1 04/11] RDMA/counter: Add an is_disabled field " Leon Romanovsky
2021-09-27 16:53 ` Jason Gunthorpe
2021-09-28 3:28 ` Mark Zhang
2021-09-28 11:51 ` Jason Gunthorpe
2021-09-14 23:07 ` [PATCH rdma-next v1 05/11] RDMA/counter: Add optional counter support Leon Romanovsky
2021-09-27 17:03 ` Jason Gunthorpe
2021-09-28 9:03 ` Mark Zhang
2021-09-28 11:51 ` Jason Gunthorpe
2021-09-29 12:14 ` Leon Romanovsky
2021-09-14 23:07 ` [PATCH rdma-next v1 06/11] RDMA/nldev: Add support to get status of all counters Leon Romanovsky
2021-09-27 17:30 ` Jason Gunthorpe
2021-09-28 9:12 ` Mark Zhang
2021-09-28 11:52 ` Jason Gunthorpe
2021-09-28 12:51 ` Mark Zhang
2021-09-29 12:26 ` Leon Romanovsky [this message]
2021-09-29 23:56 ` Jason Gunthorpe
2021-09-14 23:07 ` [PATCH rdma-next v1 07/11] RDMA/nldev: Allow optional-counter status configuration through RDMA netlink Leon Romanovsky
2021-09-27 17:20 ` Jason Gunthorpe
2021-09-29 12:27 ` Leon Romanovsky
2021-09-14 23:07 ` [PATCH rdma-next v1 08/11] RDMA/mlx5: Support optional counters in hw_stats initialization Leon Romanovsky
2021-09-14 23:07 ` [PATCH rdma-next v1 09/11] RDMA/mlx5: Add steering support in optional flow counters Leon Romanovsky
2021-09-14 23:07 ` [PATCH rdma-next v1 10/11] RDMA/mlx5: Add modify_op_stat() support Leon Romanovsky
2021-09-14 23:07 ` [PATCH rdma-next v1 11/11] RDMA/mlx5: Add optional counter support in get_hw_stats callback Leon Romanovsky
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