netdev - [net-next 04/17] net/mlx5e: TC: Reserved bit 31 of REG

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Date:   Wed, 26 May 2021 21:35:56 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Tariq Toukan <tariqt@...dia.com>,
        Huy Nguyen <huyn@...dia.com>, Raed Salem <raeds@...dia.com>,
        Paul Blakey <paulb@...dia.com>, Roi Dayan <roid@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 04/17] net/mlx5e: TC: Reserved bit 31 of REG_C1 for IPsec offload

From: Huy Nguyen <huyn@...dia.com>

Currently ASAP features fully utilize all the bits of the CQE's flow tag
and ft_metadata field. The flow tag field cannot be used because the
flow table tagging in FTE does not allow partial write.

We agree to reserve bit 31 of CQE's ft_metadata for IPsec to avoid
ASAP CT from dropping IPsec offloaded packet

Here is the new bit layout of REG_C1. Tunnel option id is reduced to
11 bits:
< IPSEC MARKER (1) | ESW_TUN_ID(12) | ESW_TUN_OPTS(11) | ESW_ZONE_ID(8) >

Signed-off-by: Huy Nguyen <huyn@...dia.com>
Signed-off-by: Raed Salem <raeds@...dia.com>
Reviewed-by: Paul Blakey <paulb@...dia.com>
Reviewed-by: Roi Dayan <roid@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Paul Blakey <paulb@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en/rep/tc.c |  2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.h |  2 +-
 include/linux/mlx5/eswitch.h                    | 17 ++++++++++-------
 3 files changed, 12 insertions(+), 9 deletions(-)

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 6cdc52d50a48..8cef4e7cfa4b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rep/tc.c
@@ -617,7 +617,7 @@ static bool mlx5e_restore_skb(struct sk_buff *skb, u32 chain, u32 reg_c1,
 			      struct mlx5e_tc_update_priv *tc_priv)
 {
 	struct mlx5e_priv *priv = netdev_priv(skb->dev);
-	u32 tunnel_id = reg_c1 >> ESW_TUN_OFFSET;
+	u32 tunnel_id = (reg_c1 >> ESW_TUN_OFFSET) & TUNNEL_ID_MASK;
 
 	if (chain) {
 		struct mlx5_rep_uplink_priv *uplink_priv;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
index 3534d14d7d5c..721093b55acc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
@@ -129,7 +129,7 @@ struct tunnel_match_enc_opts {
  */
 #define TUNNEL_INFO_BITS 12
 #define TUNNEL_INFO_BITS_MASK GENMASK(TUNNEL_INFO_BITS - 1, 0)
-#define ENC_OPTS_BITS 12
+#define ENC_OPTS_BITS 11
 #define ENC_OPTS_BITS_MASK GENMASK(ENC_OPTS_BITS - 1, 0)
 #define TUNNEL_ID_BITS (TUNNEL_INFO_BITS + ENC_OPTS_BITS)
 #define TUNNEL_ID_MASK GENMASK(TUNNEL_ID_BITS - 1, 0)
diff --git a/include/linux/mlx5/eswitch.h b/include/linux/mlx5/eswitch.h
index 17109b65c1ac..bc7db2e059eb 100644
--- a/include/linux/mlx5/eswitch.h
+++ b/include/linux/mlx5/eswitch.h
@@ -98,10 +98,11 @@ u32 mlx5_eswitch_get_vport_metadata_for_set(struct mlx5_eswitch *esw,
 					    u16 vport_num);
 
 /* Reg C1 usage:
- * Reg C1 = < ESW_TUN_ID(12) | ESW_TUN_OPTS(12) | ESW_ZONE_ID(8) >
+ * Reg C1 = < Reserved(1) | ESW_TUN_ID(12) | ESW_TUN_OPTS(11) | ESW_ZONE_ID(8) >
  *
- * Highest 12 bits of reg c1 is the encapsulation tunnel id, next 12 bits is
- * encapsulation tunnel options, and the lowest 8 bits are used for zone id.
+ * Highest bit is reserved for other offloads as marker bit, next 12 bits of reg c1
+ * is the encapsulation tunnel id, next 11 bits is encapsulation tunnel options,
+ * and the lowest 8 bits are used for zone id.
  *
  * Zone id is used to restore CT flow when packet misses on chain.
  *
@@ -109,16 +110,18 @@ u32 mlx5_eswitch_get_vport_metadata_for_set(struct mlx5_eswitch *esw,
  * on miss and to support inner header rewrite by means of implicit chain 0
  * flows.
  */
+#define ESW_RESERVED_BITS 1
 #define ESW_ZONE_ID_BITS 8
-#define ESW_TUN_OPTS_BITS 12
+#define ESW_TUN_OPTS_BITS 11
 #define ESW_TUN_ID_BITS 12
 #define ESW_TUN_OPTS_OFFSET ESW_ZONE_ID_BITS
 #define ESW_TUN_OFFSET ESW_TUN_OPTS_OFFSET
 #define ESW_ZONE_ID_MASK GENMASK(ESW_ZONE_ID_BITS - 1, 0)
-#define ESW_TUN_OPTS_MASK GENMASK(32 - ESW_TUN_ID_BITS - 1, ESW_TUN_OPTS_OFFSET)
-#define ESW_TUN_MASK GENMASK(31, ESW_TUN_OFFSET)
+#define ESW_TUN_OPTS_MASK GENMASK(31 - ESW_TUN_ID_BITS - ESW_RESERVED_BITS, ESW_TUN_OPTS_OFFSET)
+#define ESW_TUN_MASK GENMASK(31 - ESW_RESERVED_BITS, ESW_TUN_OFFSET)
 #define ESW_TUN_ID_SLOW_TABLE_GOTO_VPORT 0 /* 0 is not a valid tunnel id */
-#define ESW_TUN_OPTS_SLOW_TABLE_GOTO_VPORT 0xFFF /* 0xFFF is a reserved mapping */
+/* 0x7FF is a reserved mapping */
+#define ESW_TUN_OPTS_SLOW_TABLE_GOTO_VPORT GENMASK(ESW_TUN_OPTS_BITS - 1, 0)
 #define ESW_TUN_SLOW_TABLE_GOTO_VPORT ((ESW_TUN_ID_SLOW_TABLE_GOTO_VPORT << ESW_TUN_OPTS_BITS) | \
 				       ESW_TUN_OPTS_SLOW_TABLE_GOTO_VPORT)
 #define ESW_TUN_SLOW_TABLE_GOTO_VPORT_MARK ESW_TUN_OPTS_MASK
-- 
2.31.1