Merge branch 'tc-action-offload'

Simon Horman says:

====================
allow user to offload tc action to net device

Baowen Zheng says:

Allow use of flow_indr_dev_register/flow_indr_dev_setup_offload to offload
tc actions independent of flows.

The motivation for this work is to prepare for using TC police action
instances to provide hardware offload of OVS metering feature - which calls
for policers that may be used by multiple flows and whose lifecycle is
independent of any flows that use them.

This patch includes basic changes to offload drivers to return EOPNOTSUPP
if this feature is used - it is not yet supported by any driver.

Tc cli command to offload and quote an action:

 # tc qdisc del dev $DEV ingress && sleep 1 || true
 # tc actions delete action police index 200 || true

 # tc qdisc add dev $DEV ingress
 # tc qdisc show dev $DEV ingress

 # tc actions add action police rate 100mbit burst 10000k index 200 skip_sw
 # tc -s -d actions list action police
 total acts 1

         action order 0:  police 0xc8 rate 100Mbit burst 10000Kb mtu 2Kb action reclassify
         overhead 0b linklayer ethernet
         ref 1 bind 0  installed 142 sec used 0 sec
         Action statistics:
         Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
         backlog 0b 0p requeues 0
         skip_sw in_hw in_hw_count 1
         used_hw_stats delayed

 # tc filter add dev $DEV protocol ip parent ffff: \
         flower skip_sw ip_proto tcp action police index 200
 # tc -s -d filter show dev $DEV protocol ip parent ffff:
 filter pref 49152 flower chain 0
 filter pref 49152 flower chain 0 handle 0x1
   eth_type ipv4
   ip_proto tcp
   skip_sw
   in_hw in_hw_count 1
         action order 1:  police 0xc8 rate 100Mbit burst 10000Kb mtu 2Kb action
         reclassify overhead 0b linklayer ethernet
         ref 2 bind 1  installed 300 sec used 0 sec
         Action statistics:
         Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
         backlog 0b 0p requeues 0
         skip_sw in_hw in_hw_count 1
         used_hw_stats delayed

 # tc filter add dev $DEV protocol ipv6 parent ffff: \
         flower skip_sw ip_proto tcp action police index 200
 # tc -s -d filter show dev $DEV protocol ipv6 parent ffff:
   filter pref 49151 flower chain 0
   filter pref 49151 flower chain 0 handle 0x1
   eth_type ipv6
   ip_proto tcp
   skip_sw
   in_hw in_hw_count 1
         action order 1:  police 0xc8 rate 100Mbit burst 10000Kb mtu 2Kb action
         reclassify overhead 0b linklayer ethernet
         ref 3 bind 2  installed 761 sec used 0 sec
         Action statistics:
         Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
         backlog 0b 0p requeues 0
         skip_sw in_hw in_hw_count 1
         used_hw_stats delayed

 # tc -s -d actions list action police
 total acts 1

          action order 0:  police 0xc8 rate 100Mbit burst 10000Kb mtu 2Kb action reclassify overhead 0b linklayer ethernet
          ref 3 bind 2  installed 917 sec used 0 sec
          Action statistics:
          Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
          backlog 0b 0p requeues 0
          skip_sw in_hw in_hw_count 1
         used_hw_stats delayed

Changes between v7 and v8:
* Rename enum offload_act_command as enum flow_offload_act_command
* Add a single patch to rename exts stats update function for readability.
* Fix the kernel test robot issue reported by Oliver Sang.

Changes between v6 and v7:
* Add a single patch to rename offload functions with offload for readability.
* Post 166b6a46b78b ("flow_offload: return EOPNOTSUPP for the unsupported mpls action type") as a bug fix to netdev.
* Rename enum flow_act_command as enum flow_offload_act_command
* Rename the new added action offload setup ops with offload instead of flow
* Rename the new added action offload function with offload instead of flow.
* Add more selftest cases for validate filter and actions.

Changes between v5 and v6:
* Fix issue reported by Dan Carpenter found using Smatch.

Changes beteeen v4 and v5:
* Made changes of code style according to the public review comments.
* Add a fix for unsupported mpls action type in flow action setup stage.
* Add ops to tc_action_ops for flow action setup to facilitate
  adding a standalone action module.
* Add notification process when deleting action in reoffload process.

Changes between v3 and v4:
* Made changes according to the public review comments.
* Validate flags inside tcf_action_init() instead of creating new
  tcf_exts_validate_actions() function.
* Exactly match when validating flags of actions and filters.
* Add index to flow_action_entry for driver to identify actions.

Changes between v2 and v3:
* Made changes according to the review comments.
* Delete in_hw and not_in_hw flag and user can judge if the action is
  offloaded to any hardware by in_hw_count.
* Split the main patch of the action offload to three single patch to
  facilitate code review.

Changes between v1 and v2:
* Add the skip_hw/skip_sw for user to specify if the action should be in
  hardware or software.
* Fix issue of sleeping function called from invalid context.
* Change the action offload/delete from batch to one by one.
* Add some parameters to the netlink message for user space to look up
  the offload status of the actions.
* Add reoffload process to update action hw_count when driver is inserted
  or removed.

Changes between v1 and RFC:
* Fix robot test failure.
* Change actions offload process in action add function rather than action
  init.
* Change actions offload delete process after tcf_del_notify to keep
  undeleted actions.
* Add process to update actions stats from hardware.
====================

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

8 files changed, 15 insertions, 9 deletions

diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 110d6c403bdd..4ffd303c64ea 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1745,7 +1745,7 @@ static void vsc9959_psfp_sfi_table_del(struct ocelot *ocelot, u32 index)
 static void vsc9959_psfp_parse_gate(const struct flow_action_entry *entry,
 				    struct felix_stream_gate *sgi)
 {
-	sgi->index = entry->gate.index;
+	sgi->index = entry->hw_index;
 	sgi->ipv_valid = (entry->gate.prio < 0) ? 0 : 1;
 	sgi->init_ipv = (sgi->ipv_valid) ? entry->gate.prio : 0;
 	sgi->basetime = entry->gate.basetime;
@@ -1947,7 +1947,7 @@ static int vsc9959_psfp_filter_add(struct ocelot *ocelot, int port,
 			kfree(sgi);
 			break;
 		case FLOW_ACTION_POLICE:
-			index = a->police.index + VSC9959_PSFP_POLICER_BASE;
+			index = a->hw_index + VSC9959_PSFP_POLICER_BASE;
 			if (index > VSC9959_PSFP_POLICER_MAX) {
 				ret = -EINVAL;
 				goto err;
diff --git a/drivers/net/dsa/sja1105/sja1105_flower.c b/drivers/net/dsa/sja1105/sja1105_flower.c
index 72b9b39b0989..7dcdd784aea4 100644
--- a/drivers/net/dsa/sja1105/sja1105_flower.c
+++ b/drivers/net/dsa/sja1105/sja1105_flower.c
@@ -379,7 +379,7 @@ int sja1105_cls_flower_add(struct dsa_switch *ds, int port,
 			vl_rule = true;
 
 			rc = sja1105_vl_gate(priv, port, extack, cookie,
-					     &key, act->gate.index,
+					     &key, act->hw_index,
 					     act->gate.prio,
 					     act->gate.basetime,
 					     act->gate.cycletime,
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
index 1471b6130a2b..d8afcf8d6b30 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
@@ -1962,7 +1962,7 @@ static int bnxt_tc_setup_indr_cb(struct net_device *netdev, struct Qdisc *sch, v
 				 void *data,
 				 void (*cleanup)(struct flow_block_cb *block_cb))
 {
-	if (!bnxt_is_netdev_indr_offload(netdev))
+	if (!netdev || !bnxt_is_netdev_indr_offload(netdev))
 		return -EOPNOTSUPP;
 
 	switch (type) {
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
index 0536d2c76fbc..3555c12edb45 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -1182,7 +1182,7 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 	}
 
 	/* parsing gate action */
-	if (entryg->gate.index >= priv->psfp_cap.max_psfp_gate) {
+	if (entryg->hw_index >= priv->psfp_cap.max_psfp_gate) {
 		NL_SET_ERR_MSG_MOD(extack, "No Stream Gate resource!");
 		err = -ENOSPC;
 		goto free_filter;
@@ -1202,7 +1202,7 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 	}
 
 	refcount_set(&sgi->refcount, 1);
-	sgi->index = entryg->gate.index;
+	sgi->index = entryg->hw_index;
 	sgi->init_ipv = entryg->gate.prio;
 	sgi->basetime = entryg->gate.basetime;
 	sgi->cycletime = entryg->gate.cycletime;
@@ -1244,7 +1244,7 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 			refcount_set(&fmi->refcount, 1);
 			fmi->cir = entryp->police.rate_bytes_ps;
 			fmi->cbs = entryp->police.burst;
-			fmi->index = entryp->police.index;
+			fmi->index = entryp->hw_index;
 			filter->flags |= ENETC_PSFP_FLAGS_FMI;
 			filter->fmi_index = fmi->index;
 			sfi->meter_id = fmi->index;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
index fcb0892c08a9..0991345c4ae5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
@@ -517,6 +517,9 @@ int mlx5e_rep_indr_setup_cb(struct net_device *netdev, struct Qdisc *sch, void *
 			    void *data,
 			    void (*cleanup)(struct flow_block_cb *block_cb))
 {
+	if (!netdev)
+		return -EOPNOTSUPP;
+
 	switch (type) {
 	case TC_SETUP_BLOCK:
 		return mlx5e_rep_indr_setup_block(netdev, sch, cb_priv, type_data,
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index be3791ca6069..186c556f0de1 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -203,7 +203,7 @@ static int mlxsw_sp_flower_parse_actions(struct mlxsw_sp *mlxsw_sp,
 			 */
 			burst = roundup_pow_of_two(act->police.burst);
 			err = mlxsw_sp_acl_rulei_act_police(mlxsw_sp, rulei,
-							    act->police.index,
+							    act->hw_index,
 							    act->police.rate_bytes_ps,
 							    burst, extack);
 			if (err)
diff --git a/drivers/net/ethernet/mscc/ocelot_flower.c b/drivers/net/ethernet/mscc/ocelot_flower.c
index 58fce173f95b..beb9379424c0 100644
--- a/drivers/net/ethernet/mscc/ocelot_flower.c
+++ b/drivers/net/ethernet/mscc/ocelot_flower.c
@@ -303,7 +303,7 @@ static int ocelot_flower_parse_action(struct ocelot *ocelot, int port,
 			}
 			filter->action.police_ena = true;
 
-			pol_ix = a->police.index + ocelot->vcap_pol.base;
+			pol_ix = a->hw_index + ocelot->vcap_pol.base;
 			pol_max = ocelot->vcap_pol.max;
 
 			if (ocelot->vcap_pol.max2 && pol_ix > pol_max) {
diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 224089d04d98..f97eff5afd12 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -1867,6 +1867,9 @@ nfp_flower_indr_setup_tc_cb(struct net_device *netdev, struct Qdisc *sch, void *
 			    void *data,
 			    void (*cleanup)(struct flow_block_cb *block_cb))
 {
+	if (!netdev)
+		return -EOPNOTSUPP;
+
 	if (!nfp_fl_is_netdev_to_offload(netdev))
 		return -EOPNOTSUPP;