From: Michal Kubecek <mkubecek@suse.cz>
To: netdev@vger.kernel.org
Cc: Thomas Falcon <tlfalcon@linux.ibm.com>,
Cris Forno <cforno12@linux.vnet.ibm.com>,
mst@redhat.com, jasowang@redhat.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, sashal@kernel.org,
David Miller <davem@davemloft.net>,
Jakub Kicinski <jakub.kicinski@netronome.com>
Subject: Re: [PATCH, net-next, v3, 1/2] Three virtual devices (ibmveth, virtio_net, and netvsc) all have similar code to set/get link settings and validate ethtool command. To eliminate duplication of code, it is factored out into core/ethtool.c.
Date: Fri, 20 Dec 2019 08:04:18 +0100 [thread overview]
Message-ID: <20191220070418.GE21614@unicorn.suse.cz> (raw)
In-Reply-To: <bac064bd-fba1-e453-7754-022ea6a191f2@linux.ibm.com>
On Thu, Dec 19, 2019 at 07:26:14PM -0600, Thomas Falcon wrote:
> On 12/19/19 4:36 PM, Michal Kubecek wrote:
> > On Thu, Dec 19, 2019 at 01:40:56PM -0600, Cris Forno wrote:
[...]
> > > @@ -579,6 +579,32 @@ static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
> > > return 0;
> > > }
> > > +/* Check if the user is trying to change anything besides speed/duplex */
> > > +static bool
> > > +ethtool_virtdev_validate_cmd(const struct ethtool_link_ksettings *cmd)
> > > +{
> > > + struct ethtool_link_ksettings diff1 = *cmd;
> > > + struct ethtool_link_ksettings diff2 = {};
> > > +
> > > + /* cmd is always set so we need to clear it, validate the port type
> > > + * and also without autonegotiation we can ignore advertising
> > > + */
> > > + diff1.base.speed = 0;
> > > + diff2.base.port = PORT_OTHER;
> > > + ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
> > > + diff1.base.duplex = 0;
> > > + diff1.base.cmd = 0;
> > > + diff1.base.link_mode_masks_nwords = 0;
> > > +
> > > + return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) &&
> > > + bitmap_empty(diff1.link_modes.supported,
> > > + __ETHTOOL_LINK_MODE_MASK_NBITS) &&
> > > + bitmap_empty(diff1.link_modes.advertising,
> > > + __ETHTOOL_LINK_MODE_MASK_NBITS) &&
> > Isn't this condition always true? You zeroed the advertising bitmap
> > above. Could you just omit this part and clearing of advertising above?
> >
> > > + bitmap_empty(diff1.link_modes.lp_advertising,
> > > + __ETHTOOL_LINK_MODE_MASK_NBITS);
> > > +}
> > Another idea: instead of zeroing parts of diff1, you could copy these
> > members from *cmd to diff2 and compare cmd->base with diff2.base. You
> > could then drop diff1. And you wouldn't even need whole struct
> > ethtool_link_ksettings for diff2 as you only compare embedded struct
> > ethtool_link_settings (and check two bitmaps in cmd->link_modes).
>
> If I understand your suggestion correctly, then the validate function might
> look something like this?
>
> /* Check if the user is trying to change anything besides speed/duplex */
> static bool
> ethtool_virtdev_validate_cmd(const struct ethtool_link_ksettings *cmd)
> {
> struct ethtool_link_settings base2 = {};
>
> base2.speed = cmd->base.speed;
> base2.port = PORT_OTHER;
> base2.duplex = cmd->base.duplex;
> base2.cmd = cmd->base.cmd;
> base2.link_mode_masks_nwords = cmd->base.link_mode_masks_nwords;
>
> return !memcmp(&base2, cmd->base, sizeof(base2)) &&
> bitmap_empty(cmd->link_modes.supported,
> __ETHTOOL_LINK_MODE_MASK_NBITS) &&
> bitmap_empty(cmd->link_modes.lp_advertising,
> __ETHTOOL_LINK_MODE_MASK_NBITS);
> }
Yes, that is what I wanted to suggest (the second argument of memcmp()
should be "&cmd->base", I think).
Michal
next prev parent reply other threads:[~2019-12-20 7:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-19 19:40 [PATCH, net-next, v3, 0/2] net/ethtool: Introduce link_ksettings API for virtual network devices Cris Forno
2019-12-19 19:40 ` [PATCH, net-next, v3, 1/2] Three virtual devices (ibmveth, virtio_net, and netvsc) all have similar code to set/get link settings and validate ethtool command. To eliminate duplication of code, it is factored out into core/ethtool.c Cris Forno
2019-12-19 22:36 ` Michal Kubecek
2019-12-20 1:26 ` Thomas Falcon
2019-12-20 7:04 ` Michal Kubecek [this message]
2020-01-07 17:40 ` Cristobal Forno
2019-12-19 19:40 ` [PATCH, net-next, v3, 2/2] With get/set link settings functions in core/ethtool.c, ibmveth, netvsc, and virtio now use the core's helper function Cris Forno
2019-12-19 21:11 ` [PATCH, net-next, v3, 0/2] net/ethtool: Introduce link_ksettings API for virtual network devices Stephen Hemminger
2019-12-19 22:16 ` David Miller
2019-12-20 3:29 ` Stephen Hemminger
2019-12-20 22:53 ` David Miller
2019-12-20 3:58 ` Stephen Hemminger
2019-12-20 22:30 ` Stephen Hemminger
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