Date:   Thu, 23 Feb 2023 23:50:26 +0000
From:   <edward.cree@....com>
To:     <netdev@...r.kernel.org>
CC:     Edward Cree <ecree.xilinx@...il.com>, <linux-net-drivers@....com>,
        <habetsm.xilinx@...il.com>, <leon@...nel.org>
Subject: [RFC PATCH v2 net-next] sfc: support offloading TC VLAN push/pop actions to the MAE

From: Edward Cree <ecree.xilinx@...il.com>

EF100 can pop and/or push up to two VLAN tags.

Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
Changed in v2: reworked act->vlan_push/pop to be counts rather than bitmasks,
 and simplified the corresponding efx_tc_action_order handling.

 drivers/net/ethernet/sfc/mae.c  | 16 +++++++++++++
 drivers/net/ethernet/sfc/mcdi.h |  5 +++++
 drivers/net/ethernet/sfc/tc.c   | 40 +++++++++++++++++++++++++++++++++
 drivers/net/ethernet/sfc/tc.h   |  4 ++++
 4 files changed, 65 insertions(+)

diff --git a/drivers/net/ethernet/sfc/mae.c b/drivers/net/ethernet/sfc/mae.c
index 6321fd393fc3..142b3d6ae6aa 100644
--- a/drivers/net/ethernet/sfc/mae.c
+++ b/drivers/net/ethernet/sfc/mae.c
@@ -682,6 +682,10 @@ int efx_mae_alloc_action_set(struct efx_nic *efx, struct efx_tc_action_set *act)
 	size_t outlen;
 	int rc;
 
+	MCDI_POPULATE_DWORD_2(inbuf, MAE_ACTION_SET_ALLOC_IN_FLAGS,
+			      MAE_ACTION_SET_ALLOC_IN_VLAN_PUSH, act->vlan_push,
+			      MAE_ACTION_SET_ALLOC_IN_VLAN_POP, act->vlan_pop);
+
 	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_SRC_MAC_ID,
 		       MC_CMD_MAE_MAC_ADDR_ALLOC_OUT_MAC_ID_NULL);
 	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_DST_MAC_ID,
@@ -694,6 +698,18 @@ int efx_mae_alloc_action_set(struct efx_nic *efx, struct efx_tc_action_set *act)
 			       MC_CMD_MAE_COUNTER_ALLOC_OUT_COUNTER_ID_NULL);
 	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_COUNTER_LIST_ID,
 		       MC_CMD_MAE_COUNTER_LIST_ALLOC_OUT_COUNTER_LIST_ID_NULL);
+	if (act->vlan_push) {
+		MCDI_SET_WORD_BE(inbuf, MAE_ACTION_SET_ALLOC_IN_VLAN0_TCI_BE,
+				 act->vlan_tci[0]);
+		MCDI_SET_WORD_BE(inbuf, MAE_ACTION_SET_ALLOC_IN_VLAN0_PROTO_BE,
+				 act->vlan_proto[0]);
+	}
+	if (act->vlan_push >= 2) {
+		MCDI_SET_WORD_BE(inbuf, MAE_ACTION_SET_ALLOC_IN_VLAN1_TCI_BE,
+				 act->vlan_tci[1]);
+		MCDI_SET_WORD_BE(inbuf, MAE_ACTION_SET_ALLOC_IN_VLAN1_PROTO_BE,
+				 act->vlan_proto[1]);
+	}
 	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_ENCAP_HEADER_ID,
 		       MC_CMD_MAE_ENCAP_HEADER_ALLOC_OUT_ENCAP_HEADER_ID_NULL);
 	if (act->deliver)
diff --git a/drivers/net/ethernet/sfc/mcdi.h b/drivers/net/ethernet/sfc/mcdi.h
index b139b76febff..454e9d51a4c2 100644
--- a/drivers/net/ethernet/sfc/mcdi.h
+++ b/drivers/net/ethernet/sfc/mcdi.h
@@ -233,6 +233,11 @@ void efx_mcdi_sensor_event(struct efx_nic *efx, efx_qword_t *ev);
 	((void)BUILD_BUG_ON_ZERO(_field ## _LEN != 2),  \
 	le16_to_cpu(*(__force const __le16 *)MCDI_STRUCT_PTR(_buf, _field)))
 /* Write a 16-bit field defined in the protocol as being big-endian. */
+#define MCDI_SET_WORD_BE(_buf, _field, _value) do {			\
+	BUILD_BUG_ON(MC_CMD_ ## _field ## _LEN != 2);			\
+	BUILD_BUG_ON(MC_CMD_ ## _field ## _OFST & 1);			\
+	*(__force __be16 *)MCDI_PTR(_buf, _field) = (_value);		\
+	} while (0)
 #define MCDI_STRUCT_SET_WORD_BE(_buf, _field, _value) do {		\
 	BUILD_BUG_ON(_field ## _LEN != 2);				\
 	BUILD_BUG_ON(_field ## _OFST & 1);				\
diff --git a/drivers/net/ethernet/sfc/tc.c b/drivers/net/ethernet/sfc/tc.c
index deeaab9ee761..12b34320bc81 100644
--- a/drivers/net/ethernet/sfc/tc.c
+++ b/drivers/net/ethernet/sfc/tc.c
@@ -286,6 +286,8 @@ static int efx_tc_flower_parse_match(struct efx_nic *efx,
 
 /* For details of action order constraints refer to SF-123102-TC-1§12.6.1 */
 enum efx_tc_action_order {
+	EFX_TC_AO_VLAN_POP,
+	EFX_TC_AO_VLAN_PUSH,
 	EFX_TC_AO_COUNT,
 	EFX_TC_AO_DELIVER
 };
@@ -294,6 +296,20 @@ static bool efx_tc_flower_action_order_ok(const struct efx_tc_action_set *act,
 					  enum efx_tc_action_order new)
 {
 	switch (new) {
+	case EFX_TC_AO_VLAN_POP:
+		if (act->vlan_pop >= 2)
+			return false;
+		/* If we've already pushed a VLAN, we can't then pop it;
+		 * the hardware would instead try to pop an existing VLAN
+		 * before pushing the new one.
+		 */
+		if (act->vlan_push)
+			return false;
+		fallthrough;
+	case EFX_TC_AO_VLAN_PUSH:
+		if (act->vlan_push >= 2)
+			return false;
+		fallthrough;
 	case EFX_TC_AO_COUNT:
 		if (act->count)
 			return false;
@@ -393,6 +409,7 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
 
 	flow_action_for_each(i, fa, &fr->action) {
 		struct efx_tc_action_set save;
+		u16 tci;
 
 		if (!act) {
 			/* more actions after a non-pipe action */
@@ -494,6 +511,29 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
 			}
 			*act = save;
 			break;
+		case FLOW_ACTION_VLAN_POP:
+			if (act->vlan_push) {
+				act->vlan_push--;
+			} else if (efx_tc_flower_action_order_ok(act, EFX_TC_AO_VLAN_POP)) {
+				act->vlan_pop++;
+			} else {
+				NL_SET_ERR_MSG_MOD(extack, "More than two VLAN pops, or action order violated");
+				rc = -EINVAL;
+				goto release;
+			}
+			break;
+		case FLOW_ACTION_VLAN_PUSH:
+			if (!efx_tc_flower_action_order_ok(act, EFX_TC_AO_VLAN_PUSH)) {
+				rc = -EINVAL;
+				NL_SET_ERR_MSG_MOD(extack, "More than two VLAN pushes, or action order violated");
+				goto release;
+			}
+			tci = fa->vlan.vid & 0x0fff;
+			tci |= fa->vlan.prio << 13;
+			act->vlan_tci[act->vlan_push] = cpu_to_be16(tci);
+			act->vlan_proto[act->vlan_push] = fa->vlan.proto;
+			act->vlan_push++;
+			break;
 		default:
 			NL_SET_ERR_MSG_FMT_MOD(extack, "Unhandled action %u",
 					       fa->id);
diff --git a/drivers/net/ethernet/sfc/tc.h b/drivers/net/ethernet/sfc/tc.h
index 418ce8c13a06..542853f60c2a 100644
--- a/drivers/net/ethernet/sfc/tc.h
+++ b/drivers/net/ethernet/sfc/tc.h
@@ -19,7 +19,11 @@
 #define IS_ALL_ONES(v)	(!(typeof (v))~(v))
 
 struct efx_tc_action_set {
+	u16 vlan_push:2;
+	u16 vlan_pop:2;
 	u16 deliver:1;
+	__be16 vlan_tci[2]; /* TCIs for vlan_push */
+	__be16 vlan_proto[2]; /* Ethertypes for vlan_push */
 	struct efx_tc_counter_index *count;
 	u32 dest_mport;
 	u32 fw_id; /* index of this entry in firmware actions table */

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