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Date: Thu, 06 Mar 2014 11:33:29 -0800
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: Shannon Nelson <shannon.nelson@...el.com>
Cc: Joe Perches <joe@...ches.com>, davem@...emloft.net,
netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com,
Kavindya Deegala <kavindya.s.deegala@...el.com>
Subject: Re: [net-next 01/13] i40e: use ether_addr_equal_64bits
On Thu, 2014-03-06 at 10:10 -0800, Shannon Nelson wrote:
> No, none of those uses are fast path. I'd prefer we drop this patch.
> sln
>
Ok based on Joe's and Shannon's responses, I will drop this patch from
the series.
Dave- v2 of the series will be coming shortly.
>
> On Wed, Mar 5, 2014 at 8:40 PM, Jeff Kirsher
> <jeffrey.t.kirsher@...el.com> wrote:
> On Wed, 2014-03-05 at 20:35 -0800, Joe Perches wrote:
> > On Wed, 2014-03-05 at 20:21 -0800, Jeff Kirsher wrote:
> > > From: Joe Perches <joe@...ches.com>
> > >
> > > All ether_addr_equal tests in i40e can use the
> > > slightly more efficient ether_addr_equal_64bits.
> > >
> > > All addresses passed to the various functions that
> > > use ether_addr_equal are using structs that have 2
> > > or more bytes of additional data after the mac addr
> > > being tested.
> >
> > Hey Jeff. Hi Kavindya.
> >
> > I don't know if these are really that important to convert.
> >
> > I did these when I looked for an example to convert and
> > I thought "hey, 40 gig's fast, I should start there..."
> >
> > Recently, I've come to think that ether_addr_equal should
> > be used almost exclusively and ether_addr_equal_64bits
> > should only be used on performance sensitive or fast-path
> > code.
> >
> > Are any of these on anything like a fast path or are
> > performance sensitive?
>
>
> Not sure if Kavindya has before and after performance numbers,
> hopefully
> she does and can provide the numbers tomorrow.
>
> >
> > If not, maybe this patch should get tossed.
> >
> > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c
> b/drivers/net/ethernet/intel/i40e/i40e_main.c
> > []
> > > @@ -997,7 +997,7 @@ static struct i40e_mac_filter
> *i40e_find_filter(struct i40e_vsi *vsi,
> > > return NULL;
> > >
> > > list_for_each_entry(f, &vsi->mac_filter_list, list) {
> > > - if ((ether_addr_equal(macaddr, f->macaddr)) &&
> > > + if (ether_addr_equal_64bits(macaddr,
> f->macaddr) &&
> > > (vlan == f->vlan) &&
> > > (!is_vf || f->is_vf) &&
> > > (!is_netdev || f->is_netdev))
> > > @@ -1025,7 +1025,7 @@ struct i40e_mac_filter
> *i40e_find_mac(struct i40e_vsi *vsi, u8 *macaddr,
> > > return NULL;
> > >
> > > list_for_each_entry(f, &vsi->mac_filter_list, list) {
> > > - if ((ether_addr_equal(macaddr, f->macaddr)) &&
> > > + if (ether_addr_equal_64bits(macaddr,
> f->macaddr) &&
> > > (!is_vf || f->is_vf) &&
> > > (!is_netdev || f->is_netdev))
> > > return f;
> >
> > Well, maybe these 2.
> >
> > > @@ -1214,7 +1214,7 @@ static int i40e_set_mac(struct
> net_device *netdev, void *p)
> > >
> > > netdev_info(netdev, "set mac address=%pM\n",
> addr->sa_data);
> > >
> > > - if (ether_addr_equal(netdev->dev_addr, addr->sa_data))
> > > + if (ether_addr_equal_64bits(netdev->dev_addr,
> addr->sa_data))
> > > return 0;
> > >
> > > if (test_bit(__I40E_DOWN, &vsi->back->state) ||
> >
> > probably not.
> >
> > > @@ -1417,21 +1417,24 @@ static void
> i40e_set_rx_mode(struct net_device *netdev)
> > >
> > > if (is_multicast_ether_addr(f->macaddr)) {
> > > netdev_for_each_mc_addr(mca, netdev) {
> > > - if
> (ether_addr_equal(mca->addr, f->macaddr)) {
> > > + if
> (ether_addr_equal_64bits(mca->addr,
> > > +
> f->macaddr)) {
> > > found = true;
> > > break;
> > > }
> > > }
> > > } else {
> > > netdev_for_each_uc_addr(uca, netdev) {
> > > - if
> (ether_addr_equal(uca->addr, f->macaddr)) {
> > > + if
> (ether_addr_equal_64bits(uca->addr,
> > > +
> f->macaddr)) {
> > > found = true;
> > > break;
> > > }
> > > }
> > >
> > > for_each_dev_addr(netdev, ha) {
> > > - if (ether_addr_equal(ha->addr,
> f->macaddr)) {
> > > + if
> (ether_addr_equal_64bits(ha->addr,
> > > +
> f->macaddr)) {
> > > found = true;
> > > break;
> > > }
> >
> > probably not.
> >
> > > @@ -1905,7 +1908,8 @@ int i40e_vsi_kill_vlan(struct
> i40e_vsi *vsi, s16 vid)
> > > list_for_each_entry(f, &vsi->mac_filter_list, list) {
> > > if (is_netdev) {
> > > if (f->vlan &&
> > > - ether_addr_equal(netdev->dev_addr,
> f->macaddr))
> > > +
> ether_addr_equal_64bits(netdev->dev_addr,
> > > +
> f->macaddr))
> > > filter_count++;
> > > }
> >
> > Dunno.
> >
>
>
>
>
>
>
> --
> ==============================================
> Mr. Shannon Nelson Parents can't afford to be squeamish.
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