diff mbox series

[net-next,15/16] net/mlx5: DR, Ignore modify TTL if device doesn't support it

Message ID 20211229062502.24111-16-saeed@kernel.org (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series [net-next,01/16] net/mlx5: DR, Fix error flow in creating matcher | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Pull request is its own cover letter
netdev/patch_count warning Series longer than 15 patches
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 5 this patch: 5
netdev/cc_maintainers success CCed 3 of 3 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 3 this patch: 3
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 53 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Saeed Mahameed Dec. 29, 2021, 6:25 a.m. UTC 
From: Yevgeny Kliteynik <kliteyn@nvidia.com>

When modifying TTL, packet's csum has to be recalculated.
Due to HW issue in ConnectX-5, csum recalculation for modify TTL
is supported through a work-around that is specifically enabled
by configuration.
If the work-around isn't enabled, ignore the modify TTL action
rather than adding an unsupported action.

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Alex Vesker <valex@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 .../mellanox/mlx5/core/steering/dr_action.c   | 21 ++++++++++++++++---
 include/linux/mlx5/mlx5_ifc.h                 |  2 +-
 2 files changed, 19 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c
index f0faf04536d3..c61a5e83c78c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c
@@ -1560,6 +1560,12 @@  dr_action_modify_check_is_ttl_modify(const void *sw_action)
 	return sw_field == MLX5_ACTION_IN_FIELD_OUT_IP_TTL;
 }
 
+static bool dr_action_modify_ttl_ignore(struct mlx5dr_domain *dmn)
+{
+	return !mlx5dr_ste_supp_ttl_cs_recalc(&dmn->info.caps) &&
+	       !MLX5_CAP_ESW_FLOWTABLE(dmn->mdev, fdb_ipv4_ttl_modify);
+}
+
 static int dr_actions_convert_modify_header(struct mlx5dr_action *action,
 					    u32 max_hw_actions,
 					    u32 num_sw_actions,
@@ -1591,8 +1597,13 @@  static int dr_actions_convert_modify_header(struct mlx5dr_action *action,
 		if (ret)
 			return ret;
 
-		if (!(*modify_ttl))
-			*modify_ttl = dr_action_modify_check_is_ttl_modify(sw_action);
+		if (!(*modify_ttl) &&
+		    dr_action_modify_check_is_ttl_modify(sw_action)) {
+			if (dr_action_modify_ttl_ignore(dmn))
+				continue;
+
+			*modify_ttl = true;
+		}
 
 		/* Convert SW action to HW action */
 		ret = dr_action_modify_sw_to_hw(dmn,
@@ -1631,7 +1642,7 @@  static int dr_actions_convert_modify_header(struct mlx5dr_action *action,
 			 * modify actions doesn't exceeds the limit
 			 */
 			hw_idx++;
-			if ((num_sw_actions + hw_idx - i) >= max_hw_actions) {
+			if (hw_idx >= max_hw_actions) {
 				mlx5dr_dbg(dmn, "Modify header action number exceeds HW limit\n");
 				return -EINVAL;
 			}
@@ -1642,6 +1653,10 @@  static int dr_actions_convert_modify_header(struct mlx5dr_action *action,
 		hw_idx++;
 	}
 
+	/* if the resulting HW actions list is empty, add NOP action */
+	if (!hw_idx)
+		hw_idx++;
+
 	*num_hw_actions = hw_idx;
 
 	return 0;
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index deaa0f71213f..598ac3bcc901 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -833,7 +833,7 @@  struct mlx5_ifc_flow_table_eswitch_cap_bits {
 	u8      fdb_to_vport_reg_c_id[0x8];
 	u8      reserved_at_8[0xd];
 	u8      fdb_modify_header_fwd_to_table[0x1];
-	u8      reserved_at_16[0x1];
+	u8      fdb_ipv4_ttl_modify[0x1];
 	u8      flow_source[0x1];
 	u8      reserved_at_18[0x2];
 	u8      multi_fdb_encap[0x1];