| Message ID | 20201208090109.363-1-rasmus.villemoes@prevas.dk (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net-next] net: dsa: mv88e6xxx: don't set non-existing learn2all bit for 6220/6250 | expand |
| Context | Check | Description |
|---|---|---|
| netdev/cover_letter | success | Link |
| netdev/fixes_present | success | Link |
| netdev/patch_count | success | Link |
| netdev/tree_selection | success | Clearly marked for net-next |
| netdev/subject_prefix | success | Link |
| netdev/source_inline | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Link |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/build_32bit | success | Errors and warnings before: 0 this patch: 0 |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/verify_fixes | success | Link |
| netdev/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 14 lines checked |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 0 this patch: 0 |
| netdev/header_inline | success | Link |
| netdev/stable | success | Stable not CCed |
On Tue, Dec 08, 2020 at 10:01:09AM +0100, Rasmus Villemoes wrote: > The 6220 and 6250 switches do not have a learn2all bit in global1, ATU > control register; bit 3 is reserved. > > On the switches that do have that bit, it is used to control whether > learning frames are sent out the ports that have the message_port bit > set. So rather than adding yet another chip method, use the existence > of the ->port_setup_message_port method as a proxy for determining > whether the learn2all bit exists (and should be set). > > Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> > --- > > This doesn't fix anything from what I can tell, in particular not the > VLAN problems I'm having, so just tagging for net-next. But I do think > it's worth it on the general principle of not poking around in > undocumented/reserved bits. > > drivers/net/dsa/mv88e6xxx/chip.c | 8 +++++--- > 1 file changed, 5 insertions(+), 3 deletions(-) > > diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c > index 25449f634889..0245f3dfc1cd 100644 > --- a/drivers/net/dsa/mv88e6xxx/chip.c > +++ b/drivers/net/dsa/mv88e6xxx/chip.c > @@ -1347,9 +1347,11 @@ static int mv88e6xxx_atu_setup(struct mv88e6xxx_chip *chip) > if (err) > return err; > > - err = mv88e6xxx_g1_atu_set_learn2all(chip, true); > - if (err) > - return err; > + if (chip->info->ops->port_setup_message_port) { > + err = mv88e6xxx_g1_atu_set_learn2all(chip, true); > + if (err) > + return err; > + } Hi Rasmus This needs a comment in the code explaining why this odd structure is used. Andrew
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index 25449f634889..0245f3dfc1cd 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -1347,9 +1347,11 @@ static int mv88e6xxx_atu_setup(struct mv88e6xxx_chip *chip) if (err) return err; - err = mv88e6xxx_g1_atu_set_learn2all(chip, true); - if (err) - return err; + if (chip->info->ops->port_setup_message_port) { + err = mv88e6xxx_g1_atu_set_learn2all(chip, true); + if (err) + return err; + } return mv88e6xxx_g1_atu_set_age_time(chip, 300000); }
The 6220 and 6250 switches do not have a learn2all bit in global1, ATU control register; bit 3 is reserved. On the switches that do have that bit, it is used to control whether learning frames are sent out the ports that have the message_port bit set. So rather than adding yet another chip method, use the existence of the ->port_setup_message_port method as a proxy for determining whether the learn2all bit exists (and should be set). Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> --- This doesn't fix anything from what I can tell, in particular not the VLAN problems I'm having, so just tagging for net-next. But I do think it's worth it on the general principle of not poking around in undocumented/reserved bits. drivers/net/dsa/mv88e6xxx/chip.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)