Merge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue

Tony Nguyen says:

====================
100GbE Intel Wired LAN Driver Updates 2021-10-20

Sudheer Mogilappagari says:

This series introduces initial support for Application Device Queues(ADQ)
in ice driver. ADQ provides traffic isolation for application flows in
hardware and ability to steer traffic to a given traffic class. This
helps in aligning NIC queues to application threads.

Traffic classes are configured using mqprio framework of tc command
and mapped to HW channels(VSIs) in the driver. The queue set of each
traffic class is managed by corresponding VSI. Each traffic channel
can be configured with bandwidth rate-limiting limits and is offloaded
to the hardware through the mqprio framework by specifying the mode
option as 'channel' and shaper option as 'bw_rlimit'.

Next, the flows of application can be steered into a given traffic class
using "tc filter" command. The option "skip_sw hw_tc x" indicates
hw-offload of filtering and steering filtered traffic into specified TC.
Non-matching traffic flows through TC0.

When channel configuration are removed queue configuration is set to
default and filters configured on individual traffic classes are deleted.

example:
$ ethtool -K eth0 hw-tc-offload on

Configure 3 traffic classes and map priority 0,1,2 to TC0, TC1 and TC2
respectively. TC0 has 2 queues from offset 0 & TC1 has 8 queues from
offset 2 and TC2 has 4 queues from offset 10. Enable hardware offload
of channels.

$ tc qdisc add dev eth0 root mqprio num_tc 3 map 0 1 2 queues \
        2@0 8@2 4@10 hw 1 mode channel

$ tc qdisc show dev eth0
qdisc mqprio 8001: root  tc 2 map 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0
             queues:(0:1) (2:9) (10:13)
             mode:channel

Configure two filters to match based on dst ipaddr, dst tcp port and
redirect to TC1 and TC2.
$ tc qdisc add dev eth0 clsact

$ tc filter add dev eth0 protocol ip ingress prio 1 flower\
  dst_ip 192.168.1.1/32 ip_proto tcp dst_port 80\
  skip_sw hw_tc 1
$ tc filter add dev eth0 protocol ip ingress prio 1 flower\
  dst_ip 192.168.1.1/32 ip_proto tcp dst_port 5001\
  skip_sw hw_tc 2

$ tc filter show dev eth0 ingress

Delete traffic classes configuration:
$ sudo tc qdisc del dev eth0 root
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 119 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
index a4a299012f9f..2742e1c1e337 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.c
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -2273,6 +2273,125 @@ exit:
 }
 
 /**
+ * ice_mac_fltr_exist - does this MAC filter exist for given VSI
+ * @hw: pointer to the hardware structure
+ * @mac: MAC address to be checked (for MAC filter)
+ * @vsi_handle: check MAC filter for this VSI
+ */
+bool ice_mac_fltr_exist(struct ice_hw *hw, u8 *mac, u16 vsi_handle)
+{
+	struct ice_fltr_mgmt_list_entry *entry;
+	struct list_head *rule_head;
+	struct ice_switch_info *sw;
+	struct mutex *rule_lock; /* Lock to protect filter rule list */
+	u16 hw_vsi_id;
+
+	if (!ice_is_vsi_valid(hw, vsi_handle))
+		return false;
+
+	hw_vsi_id = ice_get_hw_vsi_num(hw, vsi_handle);
+	sw = hw->switch_info;
+	rule_head = &sw->recp_list[ICE_SW_LKUP_MAC].filt_rules;
+	if (!rule_head)
+		return false;
+
+	rule_lock = &sw->recp_list[ICE_SW_LKUP_MAC].filt_rule_lock;
+	mutex_lock(rule_lock);
+	list_for_each_entry(entry, rule_head, list_entry) {
+		struct ice_fltr_info *f_info = &entry->fltr_info;
+		u8 *mac_addr = &f_info->l_data.mac.mac_addr[0];
+
+		if (is_zero_ether_addr(mac_addr))
+			continue;
+
+		if (f_info->flag != ICE_FLTR_TX ||
+		    f_info->src_id != ICE_SRC_ID_VSI ||
+		    f_info->lkup_type != ICE_SW_LKUP_MAC ||
+		    f_info->fltr_act != ICE_FWD_TO_VSI ||
+		    hw_vsi_id != f_info->fwd_id.hw_vsi_id)
+			continue;
+
+		if (ether_addr_equal(mac, mac_addr)) {
+			mutex_unlock(rule_lock);
+			return true;
+		}
+	}
+	mutex_unlock(rule_lock);
+	return false;
+}
+
+/**
+ * ice_vlan_fltr_exist - does this VLAN filter exist for given VSI
+ * @hw: pointer to the hardware structure
+ * @vlan_id: VLAN ID
+ * @vsi_handle: check MAC filter for this VSI
+ */
+bool ice_vlan_fltr_exist(struct ice_hw *hw, u16 vlan_id, u16 vsi_handle)
+{
+	struct ice_fltr_mgmt_list_entry *entry;
+	struct list_head *rule_head;
+	struct ice_switch_info *sw;
+	struct mutex *rule_lock; /* Lock to protect filter rule list */
+	u16 hw_vsi_id;
+
+	if (vlan_id > ICE_MAX_VLAN_ID)
+		return false;
+
+	if (!ice_is_vsi_valid(hw, vsi_handle))
+		return false;
+
+	hw_vsi_id = ice_get_hw_vsi_num(hw, vsi_handle);
+	sw = hw->switch_info;
+	rule_head = &sw->recp_list[ICE_SW_LKUP_VLAN].filt_rules;
+	if (!rule_head)
+		return false;
+
+	rule_lock = &sw->recp_list[ICE_SW_LKUP_VLAN].filt_rule_lock;
+	mutex_lock(rule_lock);
+	list_for_each_entry(entry, rule_head, list_entry) {
+		struct ice_fltr_info *f_info = &entry->fltr_info;
+		u16 entry_vlan_id = f_info->l_data.vlan.vlan_id;
+		struct ice_vsi_list_map_info *map_info;
+
+		if (entry_vlan_id > ICE_MAX_VLAN_ID)
+			continue;
+
+		if (f_info->flag != ICE_FLTR_TX ||
+		    f_info->src_id != ICE_SRC_ID_VSI ||
+		    f_info->lkup_type != ICE_SW_LKUP_VLAN)
+			continue;
+
+		/* Only allowed filter action are FWD_TO_VSI/_VSI_LIST */
+		if (f_info->fltr_act != ICE_FWD_TO_VSI &&
+		    f_info->fltr_act != ICE_FWD_TO_VSI_LIST)
+			continue;
+
+		if (f_info->fltr_act == ICE_FWD_TO_VSI) {
+			if (hw_vsi_id != f_info->fwd_id.hw_vsi_id)
+				continue;
+		} else if (f_info->fltr_act == ICE_FWD_TO_VSI_LIST) {
+			/* If filter_action is FWD_TO_VSI_LIST, make sure
+			 * that VSI being checked is part of VSI list
+			 */
+			if (entry->vsi_count == 1 &&
+			    entry->vsi_list_info) {
+				map_info = entry->vsi_list_info;
+				if (!test_bit(vsi_handle, map_info->vsi_map))
+					continue;
+			}
+		}
+
+		if (vlan_id == entry_vlan_id) {
+			mutex_unlock(rule_lock);
+			return true;
+		}
+	}
+	mutex_unlock(rule_lock);
+
+	return false;
+}
+
+/**
  * ice_add_mac - Add a MAC address based filter rule
  * @hw: pointer to the hardware structure
  * @m_list: list of MAC addresses and forwarding information