The 12/06/2021 18:24, Jakub Kicinski wrote:
Hi Jakub,
>
> On Fri, 3 Dec 2021 11:46:42 +0100 Horatiu Vultur wrote:
> > This patch adds support for handling the interrupts generated by the
> > analyzer. Currently, only the MAC table generates these interrupts.
> > The MAC table will generate an interrupt whenever it learns or forgets
> > an entry in the table. It is the SW responsibility figure out which
> > entries were added/removed.
> >
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
>
> > +static struct lan966x_mac_entry *lan966x_mac_alloc_entry(struct lan966x *lan966x,
> > + const unsigned char *mac,
> > + u16 vid, u16 port_index)
> > +{
> > + struct lan966x_mac_entry *mac_entry;
> > +
> > + mac_entry = devm_kzalloc(lan966x->dev,
> > + sizeof(*mac_entry), GFP_ATOMIC);
>
> Is it really necessary to use devm_ allocation for the mac entries?
> It's 2x memory overhead.
It is not necessary.
>
> Also why GFP_ATOMIC? Memory allocations are _a lot_ less likely with
> GFP_KERNEL.
Initially I thought this is called also in some context where it
couldn't sleep. But I was wrong.
I will change these in the next version.
>
> > + if (!mac_entry)
> > + return NULL;
> > +
> > + memcpy(mac_entry->mac, mac, ETH_ALEN);
> > + mac_entry->vid = vid;
> > + mac_entry->port_index = port_index;
> > + mac_entry->row = LAN966X_MAC_INVALID_ROW;
> > + return mac_entry;
> > +}
>
> > +static void lan966x_mac_process_raw_entry(struct lan966x_mac_raw_entry *raw_entry,
> > + u8 *mac, u16 *vid, u32 *dest_idx)
> > +{
> > + mac[0] = (raw_entry->mach >> 8) & 0xff;
> > + mac[1] = (raw_entry->mach >> 0) & 0xff;
> > + mac[2] = (raw_entry->macl >> 24) & 0xff;
> > + mac[3] = (raw_entry->macl >> 16) & 0xff;
> > + mac[4] = (raw_entry->macl >> 8) & 0xff;
> > + mac[5] = (raw_entry->macl >> 0) & 0xff;
> > +
> > + *vid = (raw_entry->mach >> 16) & 0xfff;
> > + *dest_idx = ANA_MACACCESS_DEST_IDX_GET(raw_entry->maca);
>
> Double space before =
>
> > +}
> > +
> > +static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
> > + struct lan966x_mac_raw_entry *raw_entries)
> > +{
> > + struct lan966x_mac_entry *mac_entry, *tmp;
> > + unsigned long flags;
> > + char mac[ETH_ALEN];
> > + u32 dest_idx;
> > + u32 column;
> > + u16 vid;
> > +
> > + spin_lock_irqsave(&lan966x->mac_lock, flags);
> > + list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries, list) {
> > + bool founded = false;
>
> s/founded/found/
>
> > + if (mac_entry->row != row)
> > + continue;
> > +
> > + for (column = 0; column < LAN966X_MAC_COLUMNS; ++column) {
> > + /* All the valid entries are at the start of the row,
> > + * so when get one invalid entry it can just skip the
> > + * rest of the columns
> > + */
> > + if (!ANA_MACACCESS_VALID_GET(raw_entries[column].maca))
> > + break;
> > +
> > + lan966x_mac_process_raw_entry(&raw_entries[column],
> > + mac, &vid, &dest_idx);
> > + WARN_ON(dest_idx > lan966x->num_phys_ports);
> > +
> > + /* If the entry in SW is found, then there is nothing
> > + * to do
> > + */
> > + if (mac_entry->vid == vid &&
> > + ether_addr_equal(mac_entry->mac, mac) &&
>
> You need to add __aligned(2) to mac, ether_addr_equal() needs aligned
> arguments.
>
> > + mac_entry->port_index == dest_idx) {
> > + raw_entries[column].process = true;
> > + founded = true;
> > + break;
> > + }
> > + }
--
/Horatiu
