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igc: Remove mac_table from igc_adapter

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In igc_adapter we keep a sort of shadow copy of RAL and RAH registers.
There is not much benefit in keeping it, at the cost of maintainability,
since adding/removing MAC address filters is not hot path, and we
already keep filters information in adapter->nfc_filter_list for cleanup
and restoration purposes.

So in order to simplify the MAC address filtering code and prepare it
for source address support, this patch removes the mac_table from
igc_adapter.

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Andre Guedes 2020-04-10 17:28:32 -07:00 committed by Jeff Kirsher
parent 1c3739cb6e
commit d66358cae2
3 changed files with 21 additions and 48 deletions
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11
drivers/net/ethernet/intel/igc/igc.h
View File

@ -190,8 +190,6 @@ struct igc_adapter {
/* lock for RX network flow classification filter */
spinlock_t nfc_lock;
struct igc_mac_addr *mac_table;
u8 rss_indir_tbl[IGC_RETA_SIZE];
unsigned long link_check_timeout;
@ -470,15 +468,6 @@ struct igc_nfc_filter {
u16 action;
};
struct igc_mac_addr {
u8 addr[ETH_ALEN];
s8 queue;
u8 state; /* bitmask */
};
#define IGC_MAC_STATE_DEFAULT 0x1
#define IGC_MAC_STATE_IN_USE 0x2
#define IGC_MAX_RXNFC_FILTERS 16
/* igc_desc_unused - calculate if we have unused descriptors */

1
drivers/net/ethernet/intel/igc/igc_defines.h
View File

@ -62,6 +62,7 @@
* (RAR[15]) for our directed address used by controllers with
* manageability enabled, allowing us room for 15 multicast addresses.
*/
#define IGC_RAH_RAH_MASK 0x0000FFFF
#define IGC_RAH_QSEL_MASK 0x000C0000
#define IGC_RAH_QSEL_SHIFT 18
#define IGC_RAH_QSEL_ENABLE BIT(28)

57
drivers/net/ethernet/intel/igc/igc_main.c
View File

@ -820,17 +820,12 @@ static void igc_clear_mac_filter_hw(struct igc_adapter *adapter, int index)
/* Set default MAC address for the PF in the first RAR entry */
static void igc_set_default_mac_filter(struct igc_adapter *adapter)
{
struct igc_mac_addr *mac_table = &adapter->mac_table[0];
struct net_device *dev = adapter->netdev;
u8 *addr = adapter->hw.mac.addr;
netdev_dbg(dev, "Set default MAC address filter: address %pM", addr);
ether_addr_copy(mac_table->addr, addr);
mac_table->state = IGC_MAC_STATE_DEFAULT | IGC_MAC_STATE_IN_USE;
mac_table->queue = -1;
igc_set_mac_filter_hw(adapter, 0, addr, mac_table->queue);
igc_set_mac_filter_hw(adapter, 0, addr, -1);
}
/**
@ -2186,16 +2181,21 @@ static void igc_nfc_filter_restore(struct igc_adapter *adapter)
static int igc_find_mac_filter(struct igc_adapter *adapter, const u8 *addr)
{
int max_entries = adapter->hw.mac.rar_entry_count;
struct igc_mac_addr *entry;
struct igc_hw *hw = &adapter->hw;
int max_entries = hw->mac.rar_entry_count;
u32 ral, rah;
int i;
for (i = 0; i < max_entries; i++) {
entry = &adapter->mac_table[i];
ral = rd32(IGC_RAL(i));
rah = rd32(IGC_RAH(i));
if (!(entry->state & IGC_MAC_STATE_IN_USE))
if (!(rah & IGC_RAH_AV))
continue;
if (!ether_addr_equal(addr, entry->addr))
if ((rah & IGC_RAH_RAH_MASK) !=
le16_to_cpup((__le16 *)(addr + 4)))
continue;
if (ral != le32_to_cpup((__le32 *)(addr)))
continue;
return i;
@ -2206,14 +2206,15 @@ static int igc_find_mac_filter(struct igc_adapter *adapter, const u8 *addr)
static int igc_get_avail_mac_filter_slot(struct igc_adapter *adapter)
{
int max_entries = adapter->hw.mac.rar_entry_count;
struct igc_mac_addr *entry;
struct igc_hw *hw = &adapter->hw;
int max_entries = hw->mac.rar_entry_count;
u32 rah;
int i;
for (i = 0; i < max_entries; i++) {
entry = &adapter->mac_table[i];
rah = rd32(IGC_RAH(i));
if (!(entry->state & IGC_MAC_STATE_IN_USE))
if (!(rah & IGC_RAH_AV))
return i;
}
@ -2241,7 +2242,7 @@ int igc_add_mac_filter(struct igc_adapter *adapter, const u8 *addr,
index = igc_find_mac_filter(adapter, addr);
if (index >= 0)
goto update_queue_assignment;
goto update_filter;
index = igc_get_avail_mac_filter_slot(adapter);
if (index < 0)
@ -2250,11 +2251,7 @@ int igc_add_mac_filter(struct igc_adapter *adapter, const u8 *addr,
netdev_dbg(dev, "Add MAC address filter: index %d address %pM queue %d",
index, addr, queue);
ether_addr_copy(adapter->mac_table[index].addr, addr);
adapter->mac_table[index].state |= IGC_MAC_STATE_IN_USE;
update_queue_assignment:
adapter->mac_table[index].queue = queue;
update_filter:
igc_set_mac_filter_hw(adapter, index, addr, queue);
return 0;
}
@ -2269,7 +2266,6 @@ int igc_add_mac_filter(struct igc_adapter *adapter, const u8 *addr,
int igc_del_mac_filter(struct igc_adapter *adapter, const u8 *addr)
{
struct net_device *dev = adapter->netdev;
struct igc_mac_addr *entry;
int index;
if (!is_valid_ether_addr(addr))
@ -2279,24 +2275,18 @@ int igc_del_mac_filter(struct igc_adapter *adapter, const u8 *addr)
if (index < 0)
return -ENOENT;
entry = &adapter->mac_table[index];
if (entry->state & IGC_MAC_STATE_DEFAULT) {
if (index == 0) {
/* If this is the default filter, we don't actually delete it.
* We just reset to its default value i.e. disable queue
* assignment.
*/
netdev_dbg(dev, "Disable default MAC filter queue assignment");
entry->queue = -1;
igc_set_mac_filter_hw(adapter, 0, addr, entry->queue);
igc_set_mac_filter_hw(adapter, 0, addr, -1);
} else {
netdev_dbg(dev, "Delete MAC address filter: index %d address %pM",
index, addr);
entry->state = 0;
entry->queue = -1;
memset(entry->addr, 0, ETH_ALEN);
igc_clear_mac_filter_hw(adapter, index);
}
@ -3404,8 +3394,6 @@ static int igc_sw_init(struct igc_adapter *adapter)
struct pci_dev *pdev = adapter->pdev;
struct igc_hw *hw = &adapter->hw;
int size = sizeof(struct igc_mac_addr) * hw->mac.rar_entry_count;
pci_read_config_word(pdev, PCI_COMMAND, &hw->bus.pci_cmd_word);
/* set default ring sizes */
@ -3429,10 +3417,6 @@ static int igc_sw_init(struct igc_adapter *adapter)
/* Assume MSI-X interrupts, will be checked during IRQ allocation */
adapter->flags |= IGC_FLAG_HAS_MSIX;
adapter->mac_table = kzalloc(size, GFP_ATOMIC);
if (!adapter->mac_table)
return -ENOMEM;
igc_init_queue_configuration(adapter);
/* This call may decrease the number of queues */
@ -5135,7 +5119,6 @@ static void igc_remove(struct pci_dev *pdev)
pci_iounmap(pdev, adapter->io_addr);
pci_release_mem_regions(pdev);
kfree(adapter->mac_table);
free_netdev(netdev);
pci_disable_pcie_error_reporting(pdev);