[PATCH RESEND iwl-next 0/2] ice: Introduce switch recipe reusing

[PATCH RESEND iwl-next 0/2] ice: Introduce switch recipe reusing

[Steven Zou]

This patch series firstly fix the bitmap casting issue in getting/mapping
recipe to profile association that is used in both legacy and recipe
reusing mode, then introduce switch recipe reusing feature as new E810
firmware supports the corresponding functionality. 

Steven Zou (2):
  ice: Refactor FW data type and fix bitmap casting issue
  ice: Add switch recipe reusing feature

 .../net/ethernet/intel/ice/ice_adminq_cmd.h   |   5 +-
 drivers/net/ethernet/intel/ice/ice_common.c   |   2 +
 drivers/net/ethernet/intel/ice/ice_lag.c      |   4 +-
 drivers/net/ethernet/intel/ice/ice_switch.c   | 211 +++++++++++++++---
 drivers/net/ethernet/intel/ice/ice_switch.h   |   5 +-
 drivers/net/ethernet/intel/ice/ice_type.h     |   2 +
 6 files changed, 197 insertions(+), 32 deletions(-)


base-commit: f2aae2089368d8e5abb4ec01542c31bc4d011a74
-- 
2.31.1

[PATCH RESEND iwl-next 1/2] ice: Refactor FW data type and fix bitmap casting issue

[Steven Zou]

According to the datasheet, the recipe association data is an 8-byte
little-endian value. It is described as 'Bitmap of the recipe indexes
associated with this profile', it is from 24 to 31 byte area in FW.
Therefore, it is defined to '__le64 recipe_assoc' in struct
ice_aqc_recipe_to_profile. And then fix the bitmap casting issue, as we
must never ever use castings for bitmap type.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Andrii Staikov <andrii.staikov@intel.com>
Reviewed-by: Jan Sokolowski <jan.sokolowski@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Steven Zou <steven.zou@intel.com>
---
 .../net/ethernet/intel/ice/ice_adminq_cmd.h   |  3 ++-
 drivers/net/ethernet/intel/ice/ice_lag.c      |  4 ++--
 drivers/net/ethernet/intel/ice/ice_switch.c   | 24 +++++++++++--------
 drivers/net/ethernet/intel/ice/ice_switch.h   |  4 ++--
 4 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
index 2c703e95fb0d..5df50a0b7867 100644
--- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
+++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
@@ -602,8 +602,9 @@ struct ice_aqc_recipe_data_elem {
 struct ice_aqc_recipe_to_profile {
 	__le16 profile_id;
 	u8 rsvd[6];
-	DECLARE_BITMAP(recipe_assoc, ICE_MAX_NUM_RECIPES);
+	__le64 recipe_assoc;
 };
+static_assert(sizeof(struct ice_aqc_recipe_to_profile) == 16);
 
 /* Add/Update/Remove/Get switch rules (indirect 0x02A0, 0x02A1, 0x02A2, 0x02A3)
  */
diff --git a/drivers/net/ethernet/intel/ice/ice_lag.c b/drivers/net/ethernet/intel/ice/ice_lag.c
index 467372d541d2..a7a342809935 100644
--- a/drivers/net/ethernet/intel/ice/ice_lag.c
+++ b/drivers/net/ethernet/intel/ice/ice_lag.c
@@ -2041,7 +2041,7 @@ int ice_init_lag(struct ice_pf *pf)
 	/* associate recipes to profiles */
 	for (n = 0; n < ICE_PROFID_IPV6_GTPU_IPV6_TCP_INNER; n++) {
 		err = ice_aq_get_recipe_to_profile(&pf->hw, n,
-						   (u8 *)&recipe_bits, NULL);
+						   &recipe_bits, NULL);
 		if (err)
 			continue;
 
@@ -2049,7 +2049,7 @@ int ice_init_lag(struct ice_pf *pf)
 			recipe_bits |= BIT(lag->pf_recipe) |
 				       BIT(lag->lport_recipe);
 			ice_aq_map_recipe_to_profile(&pf->hw, n,
-						     (u8 *)&recipe_bits, NULL);
+						     recipe_bits, NULL);
 		}
 	}
 
diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
index f84bab80ca42..ba0ef91e4c19 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.c
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -2025,12 +2025,12 @@ ice_update_recipe_lkup_idx(struct ice_hw *hw,
  * ice_aq_map_recipe_to_profile - Map recipe to packet profile
  * @hw: pointer to the HW struct
  * @profile_id: package profile ID to associate the recipe with
- * @r_bitmap: Recipe bitmap filled in and need to be returned as response
+ * @r_assoc: Recipe bitmap filled in and need to be returned as response
  * @cd: pointer to command details structure or NULL
  * Recipe to profile association (0x0291)
  */
 int
-ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap,
+ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 r_assoc,
 			     struct ice_sq_cd *cd)
 {
 	struct ice_aqc_recipe_to_profile *cmd;
@@ -2042,7 +2042,7 @@ ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap,
 	/* Set the recipe ID bit in the bitmask to let the device know which
 	 * profile we are associating the recipe to
 	 */
-	memcpy(cmd->recipe_assoc, r_bitmap, sizeof(cmd->recipe_assoc));
+	cmd->recipe_assoc = cpu_to_le64(r_assoc);
 
 	return ice_aq_send_cmd(hw, &desc, NULL, 0, cd);
 }
@@ -2051,12 +2051,12 @@ ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap,
  * ice_aq_get_recipe_to_profile - Map recipe to packet profile
  * @hw: pointer to the HW struct
  * @profile_id: package profile ID to associate the recipe with
- * @r_bitmap: Recipe bitmap filled in and need to be returned as response
+ * @r_assoc: Recipe bitmap filled in and need to be returned as response
  * @cd: pointer to command details structure or NULL
  * Associate profile ID with given recipe (0x0293)
  */
 int
-ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap,
+ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 *r_assoc,
 			     struct ice_sq_cd *cd)
 {
 	struct ice_aqc_recipe_to_profile *cmd;
@@ -2069,7 +2069,7 @@ ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap,
 
 	status = ice_aq_send_cmd(hw, &desc, NULL, 0, cd);
 	if (!status)
-		memcpy(r_bitmap, cmd->recipe_assoc, sizeof(cmd->recipe_assoc));
+		*r_assoc = le64_to_cpu(cmd->recipe_assoc);
 
 	return status;
 }
@@ -2108,6 +2108,7 @@ int ice_alloc_recipe(struct ice_hw *hw, u16 *rid)
 static void ice_get_recp_to_prof_map(struct ice_hw *hw)
 {
 	DECLARE_BITMAP(r_bitmap, ICE_MAX_NUM_RECIPES);
+	u64 recp_assoc;
 	u16 i;
 
 	for (i = 0; i < hw->switch_info->max_used_prof_index + 1; i++) {
@@ -2115,8 +2116,9 @@ static void ice_get_recp_to_prof_map(struct ice_hw *hw)
 
 		bitmap_zero(profile_to_recipe[i], ICE_MAX_NUM_RECIPES);
 		bitmap_zero(r_bitmap, ICE_MAX_NUM_RECIPES);
-		if (ice_aq_get_recipe_to_profile(hw, i, (u8 *)r_bitmap, NULL))
+		if (ice_aq_get_recipe_to_profile(hw, i, &recp_assoc, NULL))
 			continue;
+		bitmap_from_arr64(r_bitmap, &recp_assoc, ICE_MAX_NUM_RECIPES);
 		bitmap_copy(profile_to_recipe[i], r_bitmap,
 			    ICE_MAX_NUM_RECIPES);
 		for_each_set_bit(j, r_bitmap, ICE_MAX_NUM_RECIPES)
@@ -5390,22 +5392,24 @@ ice_add_adv_recipe(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 	 */
 	list_for_each_entry(fvit, &rm->fv_list, list_entry) {
 		DECLARE_BITMAP(r_bitmap, ICE_MAX_NUM_RECIPES);
+		u64 recp_assoc;
 		u16 j;
 
 		status = ice_aq_get_recipe_to_profile(hw, fvit->profile_id,
-						      (u8 *)r_bitmap, NULL);
+						      &recp_assoc, NULL);
 		if (status)
 			goto err_unroll;
 
+		bitmap_from_arr64(r_bitmap, &recp_assoc, ICE_MAX_NUM_RECIPES);
 		bitmap_or(r_bitmap, r_bitmap, rm->r_bitmap,
 			  ICE_MAX_NUM_RECIPES);
 		status = ice_acquire_change_lock(hw, ICE_RES_WRITE);
 		if (status)
 			goto err_unroll;
 
+		bitmap_to_arr64(&recp_assoc, r_bitmap, ICE_MAX_NUM_RECIPES);
 		status = ice_aq_map_recipe_to_profile(hw, fvit->profile_id,
-						      (u8 *)r_bitmap,
-						      NULL);
+						      recp_assoc, NULL);
 		ice_release_change_lock(hw);
 
 		if (status)
diff --git a/drivers/net/ethernet/intel/ice/ice_switch.h b/drivers/net/ethernet/intel/ice/ice_switch.h
index db7e501b7e0a..89ffa1b51b5a 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.h
+++ b/drivers/net/ethernet/intel/ice/ice_switch.h
@@ -424,10 +424,10 @@ int ice_aq_add_recipe(struct ice_hw *hw,
 		      struct ice_aqc_recipe_data_elem *s_recipe_list,
 		      u16 num_recipes, struct ice_sq_cd *cd);
 int
-ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap,
+ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 *r_assoc,
 			     struct ice_sq_cd *cd);
 int
-ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u8 *r_bitmap,
+ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 r_assoc,
 			     struct ice_sq_cd *cd);
 
 #endif /* _ICE_SWITCH_H_ */
-- 
2.31.1

[PATCH RESEND iwl-next 2/2] ice: Add switch recipe reusing feature

[Steven Zou]

New E810 firmware supports the corresponding functionality, so the driver
allows PFs to subscribe the same switch recipes. Then when the PF is done
with a switch recipes, the PF can ask firmware to free that switch recipe.

When users configure a rule to PFn into E810 switch component, if there is
no existing recipe matching this rule's pattern, the driver will request
firmware to allocate and return a new recipe resource for the rule by
calling ice_add_sw_recipe() and ice_alloc_recipe(). If there is an existing
recipe matching this rule's pattern with different key value, or this is a
same second rule to PFm into switch component, the driver checks out this
recipe by calling ice_find_recp(), the driver will tell firmware to share
using this same recipe resource by calling ice_subscribable_recp_shared()
and ice_subscribe_recipe().

When firmware detects that all subscribing PFs have freed the switch
recipe, firmware will free the switch recipe so that it can be reused.

This feature also fixes a problem where all switch recipes would eventually
be exhausted because switch recipes could not be freed, as freeing a shared
recipe could potentially break other PFs that were using it.

Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Andrii Staikov <andrii.staikov@intel.com>
Signed-off-by: Steven Zou <steven.zou@intel.com>
---
 .../net/ethernet/intel/ice/ice_adminq_cmd.h   |   2 +
 drivers/net/ethernet/intel/ice/ice_common.c   |   2 +
 drivers/net/ethernet/intel/ice/ice_switch.c   | 187 ++++++++++++++++--
 drivers/net/ethernet/intel/ice/ice_switch.h   |   1 +
 drivers/net/ethernet/intel/ice/ice_type.h     |   2 +
 5 files changed, 177 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
index 5df50a0b7867..b315c734455a 100644
--- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
+++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
@@ -273,6 +273,8 @@ struct ice_aqc_set_port_params {
 #define ICE_AQC_RES_TYPE_FLAG_SHARED			BIT(7)
 #define ICE_AQC_RES_TYPE_FLAG_SCAN_BOTTOM		BIT(12)
 #define ICE_AQC_RES_TYPE_FLAG_IGNORE_INDEX		BIT(13)
+#define ICE_AQC_RES_TYPE_FLAG_SUBSCRIBE_SHARED		BIT(14)
+#define ICE_AQC_RES_TYPE_FLAG_SUBSCRIBE_CTL		BIT(15)
 
 #define ICE_AQC_RES_TYPE_FLAG_DEDICATED			0x00
 
diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index d04a057f53fe..090a2b8b5ff2 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -1146,6 +1146,8 @@ int ice_init_hw(struct ice_hw *hw)
 	if (status)
 		goto err_unroll_fltr_mgmt_struct;
 	mutex_init(&hw->tnl_lock);
+	ice_init_chk_recipe_reuse_support(hw);
+
 	return 0;
 
 err_unroll_fltr_mgmt_struct:
diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c
index ba0ef91e4c19..53dd64768035 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.c
+++ b/drivers/net/ethernet/intel/ice/ice_switch.c
@@ -2074,6 +2074,18 @@ ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 *r_assoc,
 	return status;
 }
 
+/**
+ * ice_init_chk_recipe_reuse_support - check if recipe reuse is supported
+ * @hw: pointer to the hardware structure
+ */
+void ice_init_chk_recipe_reuse_support(struct ice_hw *hw)
+{
+	struct ice_nvm_info *nvm = &hw->flash.nvm;
+
+	hw->recp_reuse = (nvm->major == 0x4 && nvm->minor >= 0x30) ||
+			 nvm->major > 0x4;
+}
+
 /**
  * ice_alloc_recipe - add recipe resource
  * @hw: pointer to the hardware structure
@@ -2083,12 +2095,16 @@ int ice_alloc_recipe(struct ice_hw *hw, u16 *rid)
 {
 	DEFINE_FLEX(struct ice_aqc_alloc_free_res_elem, sw_buf, elem, 1);
 	u16 buf_len = __struct_size(sw_buf);
+	u16 res_type;
 	int status;
 
 	sw_buf->num_elems = cpu_to_le16(1);
-	sw_buf->res_type = cpu_to_le16((ICE_AQC_RES_TYPE_RECIPE <<
-					ICE_AQC_RES_TYPE_S) |
-					ICE_AQC_RES_TYPE_FLAG_SHARED);
+	res_type = FIELD_PREP(ICE_AQC_RES_TYPE_M, ICE_AQC_RES_TYPE_RECIPE);
+	if (hw->recp_reuse)
+		res_type |= ICE_AQC_RES_TYPE_FLAG_SUBSCRIBE_SHARED;
+	else
+		res_type |= ICE_AQC_RES_TYPE_FLAG_SHARED;
+	sw_buf->res_type = cpu_to_le16(res_type);
 	status = ice_aq_alloc_free_res(hw, sw_buf, buf_len,
 				       ice_aqc_opc_alloc_res);
 	if (!status)
@@ -2097,6 +2113,70 @@ int ice_alloc_recipe(struct ice_hw *hw, u16 *rid)
 	return status;
 }
 
+/**
+ * ice_free_recipe_res - free recipe resource
+ * @hw: pointer to the hardware structure
+ * @rid: recipe ID to free
+ *
+ * Return: 0 on success, and others on error
+ */
+static int ice_free_recipe_res(struct ice_hw *hw, u16 rid)
+{
+	return ice_free_hw_res(hw, ICE_AQC_RES_TYPE_RECIPE, 1, &rid);
+}
+
+/**
+ * ice_release_recipe_res - disassociate and free recipe resource
+ * @hw: pointer to the hardware structure
+ * @recp: the recipe struct resource to unassociate and free
+ *
+ * Return: 0 on success, and others on error
+ */
+static int ice_release_recipe_res(struct ice_hw *hw,
+				  struct ice_sw_recipe *recp)
+{
+	DECLARE_BITMAP(r_bitmap, ICE_MAX_NUM_RECIPES);
+	struct ice_switch_info *sw = hw->switch_info;
+	u64 recp_assoc;
+	u32 rid, prof;
+	int status;
+
+	for_each_set_bit(rid, recp->r_bitmap, ICE_MAX_NUM_RECIPES) {
+		for_each_set_bit(prof, recipe_to_profile[rid],
+				 ICE_MAX_NUM_PROFILES) {
+			status = ice_aq_get_recipe_to_profile(hw, prof,
+							      &recp_assoc,
+							      NULL);
+			if (status)
+				return status;
+
+			bitmap_from_arr64(r_bitmap, &recp_assoc,
+					  ICE_MAX_NUM_RECIPES);
+			bitmap_andnot(r_bitmap, r_bitmap, recp->r_bitmap,
+				      ICE_MAX_NUM_RECIPES);
+			bitmap_to_arr64(&recp_assoc, r_bitmap,
+					ICE_MAX_NUM_RECIPES);
+			ice_aq_map_recipe_to_profile(hw, prof,
+						     recp_assoc, NULL);
+
+			clear_bit(rid, profile_to_recipe[prof]);
+			clear_bit(prof, recipe_to_profile[rid]);
+		}
+
+		status = ice_free_recipe_res(hw, rid);
+		if (status)
+			return status;
+
+		sw->recp_list[rid].recp_created = false;
+		sw->recp_list[rid].adv_rule = false;
+		memset(&sw->recp_list[rid].lkup_exts, 0,
+		       sizeof(sw->recp_list[rid].lkup_exts));
+		clear_bit(rid, recp->r_bitmap);
+	}
+
+	return 0;
+}
+
 /**
  * ice_get_recp_to_prof_map - updates recipe to profile mapping
  * @hw: pointer to hardware structure
@@ -2146,6 +2226,7 @@ ice_collect_result_idx(struct ice_aqc_recipe_data_elem *buf,
  * @recps: struct that we need to populate
  * @rid: recipe ID that we are populating
  * @refresh_required: true if we should get recipe to profile mapping from FW
+ * @is_add: flag of adding recipe
  *
  * This function is used to populate all the necessary entries into our
  * bookkeeping so that we have a current list of all the recipes that are
@@ -2153,7 +2234,7 @@ ice_collect_result_idx(struct ice_aqc_recipe_data_elem *buf,
  */
 static int
 ice_get_recp_frm_fw(struct ice_hw *hw, struct ice_sw_recipe *recps, u8 rid,
-		    bool *refresh_required)
+		    bool *refresh_required, bool is_add)
 {
 	DECLARE_BITMAP(result_bm, ICE_MAX_FV_WORDS);
 	struct ice_aqc_recipe_data_elem *tmp;
@@ -2270,8 +2351,12 @@ ice_get_recp_frm_fw(struct ice_hw *hw, struct ice_sw_recipe *recps, u8 rid,
 			recps[idx].chain_idx = ICE_INVAL_CHAIN_IND;
 		}
 
-		if (!is_root)
+		if (!is_root) {
+			if (hw->recp_reuse && is_add)
+				recps[idx].recp_created = true;
+
 			continue;
+		}
 
 		/* Only do the following for root recipes entries */
 		memcpy(recps[idx].r_bitmap, root_bufs.recipe_bitmap,
@@ -2295,7 +2380,8 @@ ice_get_recp_frm_fw(struct ice_hw *hw, struct ice_sw_recipe *recps, u8 rid,
 
 	/* Copy result indexes */
 	bitmap_copy(recps[rid].res_idxs, result_bm, ICE_MAX_FV_WORDS);
-	recps[rid].recp_created = true;
+	if (is_add)
+		recps[rid].recp_created = true;
 
 err_unroll:
 	kfree(tmp);
@@ -4573,12 +4659,13 @@ static struct ice_protocol_entry ice_prot_id_tbl[ICE_PROTOCOL_LAST] = {
  * @hw: pointer to the hardware structure
  * @lkup_exts: extension sequence to match
  * @rinfo: information regarding the rule e.g. priority and action info
+ * @is_add: flag of adding recipe
  *
  * Returns index of matching recipe, or ICE_MAX_NUM_RECIPES if not found.
  */
 static u16
 ice_find_recp(struct ice_hw *hw, struct ice_prot_lkup_ext *lkup_exts,
-	      const struct ice_adv_rule_info *rinfo)
+	      const struct ice_adv_rule_info *rinfo, bool is_add)
 {
 	bool refresh_required = true;
 	struct ice_sw_recipe *recp;
@@ -4592,11 +4679,12 @@ ice_find_recp(struct ice_hw *hw, struct ice_prot_lkup_ext *lkup_exts,
 		 * entry update it in our SW bookkeeping and continue with the
 		 * matching.
 		 */
-		if (!recp[i].recp_created)
+		if (hw->recp_reuse) {
 			if (ice_get_recp_frm_fw(hw,
 						hw->switch_info->recp_list, i,
-						&refresh_required))
+						&refresh_required, is_add))
 				continue;
+		}
 
 		/* Skip inverse action recipes */
 		if (recp[i].root_buf && recp[i].root_buf->content.act_ctrl &
@@ -5277,6 +5365,49 @@ ice_get_compat_fv_bitmap(struct ice_hw *hw, struct ice_adv_rule_info *rinfo,
 	ice_get_sw_fv_bitmap(hw, prof_type, bm);
 }
 
+/**
+ * ice_subscribe_recipe - subscribe to an existing recipe
+ * @hw: pointer to the hardware structure
+ * @rid: recipe ID to subscribe to
+ *
+ * Return: 0 on success, and others on error
+ */
+static int ice_subscribe_recipe(struct ice_hw *hw, u16 rid)
+{
+	DEFINE_FLEX(struct ice_aqc_alloc_free_res_elem, sw_buf, elem, 1);
+	u16 buf_len = __struct_size(sw_buf);
+	u16 res_type;
+	int status;
+
+	/* Prepare buffer to allocate resource */
+	sw_buf->num_elems = cpu_to_le16(1);
+	res_type = FIELD_PREP(ICE_AQC_RES_TYPE_M, ICE_AQC_RES_TYPE_RECIPE) |
+		   ICE_AQC_RES_TYPE_FLAG_SUBSCRIBE_SHARED |
+		   ICE_AQC_RES_TYPE_FLAG_SUBSCRIBE_CTL;
+	sw_buf->res_type = cpu_to_le16(res_type);
+
+	sw_buf->elem[0].e.sw_resp = cpu_to_le16(rid);
+
+	status = ice_aq_alloc_free_res(hw, sw_buf, buf_len,
+				       ice_aqc_opc_alloc_res);
+
+	return status;
+}
+
+/**
+ * ice_subscribable_recp_shared - share an existing subscribable recipe
+ * @hw: pointer to the hardware structure
+ * @rid: recipe ID to subscribe to
+ */
+static void ice_subscribable_recp_shared(struct ice_hw *hw, u16 rid)
+{
+	struct ice_sw_recipe *recps = hw->switch_info->recp_list;
+	u16 sub_rid;
+
+	for_each_set_bit(sub_rid, recps[rid].r_bitmap, ICE_MAX_NUM_RECIPES)
+		ice_subscribe_recipe(hw, sub_rid);
+}
+
 /**
  * ice_add_adv_recipe - Add an advanced recipe that is not part of the default
  * @hw: pointer to hardware structure
@@ -5299,6 +5430,7 @@ ice_add_adv_recipe(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 	struct ice_sw_fv_list_entry *tmp;
 	struct ice_sw_recipe *rm;
 	int status = 0;
+	u16 rid_tmp;
 	u8 i;
 
 	if (!lkups_cnt)
@@ -5376,10 +5508,14 @@ ice_add_adv_recipe(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 	}
 
 	/* Look for a recipe which matches our requested fv / mask list */
-	*rid = ice_find_recp(hw, lkup_exts, rinfo);
-	if (*rid < ICE_MAX_NUM_RECIPES)
+	*rid = ice_find_recp(hw, lkup_exts, rinfo, true);
+	if (*rid < ICE_MAX_NUM_RECIPES) {
 		/* Success if found a recipe that match the existing criteria */
+		if (hw->recp_reuse)
+			ice_subscribable_recp_shared(hw, *rid);
+
 		goto err_unroll;
+	}
 
 	rm->tun_type = rinfo->tun_type;
 	/* Recipe we need does not exist, add a recipe */
@@ -5398,14 +5534,14 @@ ice_add_adv_recipe(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 		status = ice_aq_get_recipe_to_profile(hw, fvit->profile_id,
 						      &recp_assoc, NULL);
 		if (status)
-			goto err_unroll;
+			goto err_free_recipe;
 
 		bitmap_from_arr64(r_bitmap, &recp_assoc, ICE_MAX_NUM_RECIPES);
 		bitmap_or(r_bitmap, r_bitmap, rm->r_bitmap,
 			  ICE_MAX_NUM_RECIPES);
 		status = ice_acquire_change_lock(hw, ICE_RES_WRITE);
 		if (status)
-			goto err_unroll;
+			goto err_free_recipe;
 
 		bitmap_to_arr64(&recp_assoc, r_bitmap, ICE_MAX_NUM_RECIPES);
 		status = ice_aq_map_recipe_to_profile(hw, fvit->profile_id,
@@ -5413,7 +5549,7 @@ ice_add_adv_recipe(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 		ice_release_change_lock(hw);
 
 		if (status)
-			goto err_unroll;
+			goto err_free_recipe;
 
 		/* Update profile to recipe bitmap array */
 		bitmap_copy(profile_to_recipe[fvit->profile_id], r_bitmap,
@@ -5427,6 +5563,16 @@ ice_add_adv_recipe(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 	*rid = rm->root_rid;
 	memcpy(&hw->switch_info->recp_list[*rid].lkup_exts, lkup_exts,
 	       sizeof(*lkup_exts));
+	goto err_unroll;
+
+err_free_recipe:
+	if (hw->recp_reuse) {
+		for_each_set_bit(rid_tmp, rm->r_bitmap, ICE_MAX_NUM_RECIPES) {
+			if (!ice_free_recipe_res(hw, rid_tmp))
+				clear_bit(rid_tmp, rm->r_bitmap);
+		}
+	}
+
 err_unroll:
 	list_for_each_entry_safe(r_entry, r_tmp, &rm->rg_list, l_entry) {
 		list_del(&r_entry->l_entry);
@@ -6440,7 +6586,7 @@ ice_rem_adv_rule(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 			return -EIO;
 	}
 
-	rid = ice_find_recp(hw, &lkup_exts, rinfo);
+	rid = ice_find_recp(hw, &lkup_exts, rinfo, false);
 	/* If did not find a recipe that match the existing criteria */
 	if (rid == ICE_MAX_NUM_RECIPES)
 		return -EINVAL;
@@ -6484,14 +6630,21 @@ ice_rem_adv_rule(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups,
 					 ice_aqc_opc_remove_sw_rules, NULL);
 		if (!status || status == -ENOENT) {
 			struct ice_switch_info *sw = hw->switch_info;
+			struct ice_sw_recipe *r_list = sw->recp_list;
 
 			mutex_lock(rule_lock);
 			list_del(&list_elem->list_entry);
 			devm_kfree(ice_hw_to_dev(hw), list_elem->lkups);
 			devm_kfree(ice_hw_to_dev(hw), list_elem);
 			mutex_unlock(rule_lock);
-			if (list_empty(&sw->recp_list[rid].filt_rules))
-				sw->recp_list[rid].adv_rule = false;
+			if (list_empty(&r_list[rid].filt_rules)) {
+				r_list[rid].adv_rule = false;
+
+				/* All rules for this recipe are now removed */
+				if (hw->recp_reuse)
+					ice_release_recipe_res(hw,
+							       &r_list[rid]);
+			}
 		}
 		kfree(s_rule);
 	}
diff --git a/drivers/net/ethernet/intel/ice/ice_switch.h b/drivers/net/ethernet/intel/ice/ice_switch.h
index 89ffa1b51b5a..9cf819b20d9c 100644
--- a/drivers/net/ethernet/intel/ice/ice_switch.h
+++ b/drivers/net/ethernet/intel/ice/ice_switch.h
@@ -429,5 +429,6 @@ ice_aq_get_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 *r_assoc,
 int
 ice_aq_map_recipe_to_profile(struct ice_hw *hw, u32 profile_id, u64 r_assoc,
 			     struct ice_sq_cd *cd);
+void ice_init_chk_recipe_reuse_support(struct ice_hw *hw);
 
 #endif /* _ICE_SWITCH_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_type.h b/drivers/net/ethernet/intel/ice/ice_type.h
index 3ecfdebc0473..17bf07663ebb 100644
--- a/drivers/net/ethernet/intel/ice/ice_type.h
+++ b/drivers/net/ethernet/intel/ice/ice_type.h
@@ -850,6 +850,8 @@ struct ice_hw {
 
 	u16 max_burst_size;	/* driver sets this value */
 
+	u8 recp_reuse:1;	/* indicates whether FW supports recipe reuse */
+
 	/* Tx Scheduler values */
 	u8 num_tx_sched_layers;
 	u8 num_tx_sched_phys_layers;
-- 
2.31.1

Re: [PATCH RESEND iwl-next 2/2] ice: Add switch recipe reusing feature

[Simon Horman]

On Tue, Jan 30, 2024 at 10:51:46AM +0800, Steven Zou wrote:
> New E810 firmware supports the corresponding functionality, so the driver
> allows PFs to subscribe the same switch recipes. Then when the PF is done
> with a switch recipes, the PF can ask firmware to free that switch recipe.
> 
> When users configure a rule to PFn into E810 switch component, if there is
> no existing recipe matching this rule's pattern, the driver will request
> firmware to allocate and return a new recipe resource for the rule by
> calling ice_add_sw_recipe() and ice_alloc_recipe(). If there is an existing
> recipe matching this rule's pattern with different key value, or this is a
> same second rule to PFm into switch component, the driver checks out this
> recipe by calling ice_find_recp(), the driver will tell firmware to share
> using this same recipe resource by calling ice_subscribable_recp_shared()
> and ice_subscribe_recipe().
> 
> When firmware detects that all subscribing PFs have freed the switch
> recipe, firmware will free the switch recipe so that it can be reused.
> 
> This feature also fixes a problem where all switch recipes would eventually
> be exhausted because switch recipes could not be freed, as freeing a shared
> recipe could potentially break other PFs that were using it.
> 
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Reviewed-by: Andrii Staikov <andrii.staikov@intel.com>
> Signed-off-by: Steven Zou <steven.zou@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>