mlxsw: Speed up transceiver module EEPROM dump

index 0802ef964d78..4d1787c1008d 100644
@@ -12965,10 +12965,10 @@ static const struct mlxsw_reg_info *mlxsw_reg_infos[] = {
 	MLXSW_REG(mcion),
 	MLXSW_REG(mtpps),
 	MLXSW_REG(mtutc),
-	MLXSW_REG(mpsc),
 	MLXSW_REG(mcqi),
 	MLXSW_REG(mcc),
 	MLXSW_REG(mcda),
+	MLXSW_REG(mpsc),
 	MLXSW_REG(mgpc),
 	MLXSW_REG(mprs),
 	MLXSW_REG(mogcr),

index 4d1787c1008d..01c7d9909c19 100644
@@ -10572,6 +10572,79 @@ static inline void mlxsw_reg_mcda_pack(char *payload, u32 update_handle,
 		mlxsw_reg_mcda_data_set(payload, i, *(u32 *) &data[i * 4]);
 }
 
+/* MCAM - Management Capabilities Mask Register
+ * --------------------------------------------
+ * Reports the device supported management features.
+ */
+#define MLXSW_REG_MCAM_ID 0x907F
+#define MLXSW_REG_MCAM_LEN 0x48
+
+MLXSW_REG_DEFINE(mcam, MLXSW_REG_MCAM_ID, MLXSW_REG_MCAM_LEN);
+
+enum mlxsw_reg_mcam_feature_group {
+	/* Enhanced features. */
+	MLXSW_REG_MCAM_FEATURE_GROUP_ENHANCED_FEATURES,
+};
+
+/* reg_mcam_feature_group
+ * Feature list mask index.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mcam, feature_group, 0x00, 16, 8);
+
+enum mlxsw_reg_mcam_mng_feature_cap_mask_bits {
+	/* If set, MCIA supports 128 bytes payloads. Otherwise, 48 bytes. */
+	MLXSW_REG_MCAM_MCIA_128B = 34,
+};
+
+#define MLXSW_REG_BYTES_PER_DWORD 0x4
+
+/* reg_mcam_mng_feature_cap_mask
+ * Supported port's enhanced features.
+ * Based on feature_group index.
+ * When bit is set, the feature is supported in the device.
+ * Access: RO
+ */
+#define MLXSW_REG_MCAM_MNG_FEATURE_CAP_MASK_DWORD(_dw_num, _offset)	 \
+	MLXSW_ITEM_BIT_ARRAY(reg, mcam, mng_feature_cap_mask_dw##_dw_num, \
+			     _offset, MLXSW_REG_BYTES_PER_DWORD, 1)
+
+/* The access to the bits in the field 'mng_feature_cap_mask' is not same to
+ * other mask fields in other registers. In most of the cases bit #0 is the
+ * first one in the last dword. In MCAM register, the first dword contains bits
+ * #0-#31 and so on, so the access to the bits is simpler using bit array per
+ * dword. Declare each dword of 'mng_feature_cap_mask' field separately.
+ */
+MLXSW_REG_MCAM_MNG_FEATURE_CAP_MASK_DWORD(0, 0x28);
+MLXSW_REG_MCAM_MNG_FEATURE_CAP_MASK_DWORD(1, 0x2C);
+MLXSW_REG_MCAM_MNG_FEATURE_CAP_MASK_DWORD(2, 0x30);
+MLXSW_REG_MCAM_MNG_FEATURE_CAP_MASK_DWORD(3, 0x34);
+
+static inline void
+mlxsw_reg_mcam_pack(char *payload, enum mlxsw_reg_mcam_feature_group feat_group)
+{
+	MLXSW_REG_ZERO(mcam, payload);
+	mlxsw_reg_mcam_feature_group_set(payload, feat_group);
+}
+
+static inline void
+mlxsw_reg_mcam_unpack(char *payload,
+		      enum mlxsw_reg_mcam_mng_feature_cap_mask_bits bit,
+		      bool *p_mng_feature_cap_val)
+{
+	int offset = bit % (MLXSW_REG_BYTES_PER_DWORD * BITS_PER_BYTE);
+	int dword = bit / (MLXSW_REG_BYTES_PER_DWORD * BITS_PER_BYTE);
+	u8 (*getters[])(const char *, u16) = {
+		mlxsw_reg_mcam_mng_feature_cap_mask_dw0_get,
+		mlxsw_reg_mcam_mng_feature_cap_mask_dw1_get,
+		mlxsw_reg_mcam_mng_feature_cap_mask_dw2_get,
+		mlxsw_reg_mcam_mng_feature_cap_mask_dw3_get,
+	};
+
+	if (!WARN_ON_ONCE(dword >= ARRAY_SIZE(getters)))
+		*p_mng_feature_cap_val = getters[dword](payload, offset);
+}
+
 /* MPSC - Monitoring Packet Sampling Configuration Register
  * --------------------------------------------------------
  * MPSC Register is used to configure the Packet Sampling mechanism.

@@ -12968,6 +13041,7 @@ static const struct mlxsw_reg_info *mlxsw_reg_infos[] = {
 	MLXSW_REG(mcqi),
 	MLXSW_REG(mcc),
 	MLXSW_REG(mcda),
+	MLXSW_REG(mcam),
 	MLXSW_REG(mpsc),
 	MLXSW_REG(mgpc),
 	MLXSW_REG(mprs),

index 0107cbc32fc7..679f7488ba10 100644
@@ -111,7 +111,7 @@ mlxsw_env_validate_cable_ident(struct mlxsw_core *core, u8 slot_index, int id,
 	if (err)
 		return err;
 
-	mlxsw_reg_mcia_pack(mcia_pl, slot_index, id, 0,
+	mlxsw_reg_mcia_pack(mcia_pl, slot_index, id,
 			    MLXSW_REG_MCIA_PAGE0_LO_OFF, 0, 1,
 			    MLXSW_REG_MCIA_I2C_ADDR_LOW);
 	err = mlxsw_reg_query(core, MLXSW_REG(mcia), mcia_pl);

@@ -188,7 +188,7 @@ mlxsw_env_query_module_eeprom(struct mlxsw_core *mlxsw_core, u8 slot_index,
 		}
 	}
 
-	mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, 0, page, offset, size,
+	mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, page, offset, size,
 			    i2c_addr);
 
 	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mcia), mcia_pl);

@@ -266,12 +266,12 @@ mlxsw_env_module_temp_thresholds_get(struct mlxsw_core *core, u8 slot_index,
 			page = MLXSW_REG_MCIA_TH_PAGE_CMIS_NUM;
 		else
 			page = MLXSW_REG_MCIA_TH_PAGE_NUM;
-		mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, 0, page,
+		mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, page,
 				    MLXSW_REG_MCIA_TH_PAGE_OFF + off,
 				    MLXSW_REG_MCIA_TH_ITEM_SIZE,
 				    MLXSW_REG_MCIA_I2C_ADDR_LOW);
 	} else {
-		mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, 0,
+		mlxsw_reg_mcia_pack(mcia_pl, slot_index, module,
 				    MLXSW_REG_MCIA_PAGE0_LO,
 				    off, MLXSW_REG_MCIA_TH_ITEM_SIZE,
 				    MLXSW_REG_MCIA_I2C_ADDR_HIGH);

@@ -491,7 +491,7 @@ mlxsw_env_get_module_eeprom_by_page(struct mlxsw_core *mlxsw_core,
 		size = min_t(u8, page->length - bytes_read,
 			     MLXSW_REG_MCIA_EEPROM_SIZE);
 
-		mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, 0, page->page,
+		mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, page->page,
 				    device_addr + bytes_read, size,
 				    page->i2c_address);
 		mlxsw_reg_mcia_bank_number_set(mcia_pl, page->bank);

index 01c7d9909c19..6e2ddd0aae35 100644
@@ -9635,14 +9635,6 @@ static inline void mlxsw_reg_mtbr_temp_unpack(char *payload, int rec_ind,
 
 MLXSW_REG_DEFINE(mcia, MLXSW_REG_MCIA_ID, MLXSW_REG_MCIA_LEN);
 
-/* reg_mcia_l
- * Lock bit. Setting this bit will lock the access to the specific
- * cable. Used for updating a full page in a cable EPROM. Any access
- * other then subsequence writes will fail while the port is locked.
- * Access: RW
- */
-MLXSW_ITEM32(reg, mcia, l, 0x00, 31, 1);
-
 /* reg_mcia_module
  * Module number.
  * Access: Index

@@ -9755,14 +9747,12 @@ MLXSW_ITEM_BUF(reg, mcia, eeprom, 0x10, MLXSW_REG_MCIA_EEPROM_SIZE);
 				MLXSW_REG_MCIA_EEPROM_UP_PAGE_LENGTH + 1)
 
 static inline void mlxsw_reg_mcia_pack(char *payload, u8 slot_index, u8 module,
-				       u8 lock, u8 page_number,
-				       u16 device_addr, u8 size,
+				       u8 page_number, u16 device_addr, u8 size,
 				       u8 i2c_device_addr)
 {
 	MLXSW_REG_ZERO(mcia, payload);
 	mlxsw_reg_mcia_slot_set(payload, slot_index);
 	mlxsw_reg_mcia_module_set(payload, module);
-	mlxsw_reg_mcia_l_set(payload, lock);
 	mlxsw_reg_mcia_page_number_set(payload, page_number);
 	mlxsw_reg_mcia_device_address_set(payload, device_addr);
 	mlxsw_reg_mcia_size_set(payload, size);

index 6e2ddd0aae35..71d42bcec0cd 100644
@@ -9631,7 +9631,7 @@ static inline void mlxsw_reg_mtbr_temp_unpack(char *payload, int rec_ind,
  */
 
 #define MLXSW_REG_MCIA_ID 0x9014
-#define MLXSW_REG_MCIA_LEN 0x40
+#define MLXSW_REG_MCIA_LEN 0x94
 
 MLXSW_REG_DEFINE(mcia, MLXSW_REG_MCIA_ID, MLXSW_REG_MCIA_LEN);
 

index 679f7488ba10..d637c0348fa1 100644
@@ -32,6 +32,7 @@ struct mlxsw_env {
 	const struct mlxsw_bus_info *bus_info;
 	u8 max_module_count; /* Maximum number of modules per-slot. */
 	u8 num_of_slots; /* Including the main board. */
+	u8 max_eeprom_len; /* Maximum module EEPROM transaction length. */
 	struct mutex line_cards_lock; /* Protects line cards. */
 	struct mlxsw_env_line_card *line_cards[];
 };

@@ -146,6 +147,7 @@ mlxsw_env_query_module_eeprom(struct mlxsw_core *mlxsw_core, u8 slot_index,
 			      int module, u16 offset, u16 size, void *data,
 			      bool qsfp, unsigned int *p_read_size)
 {
+	struct mlxsw_env *mlxsw_env = mlxsw_core_env(mlxsw_core);
 	char mcia_pl[MLXSW_REG_MCIA_LEN];
 	char *eeprom_tmp;
 	u16 i2c_addr;

@@ -153,11 +155,7 @@ mlxsw_env_query_module_eeprom(struct mlxsw_core *mlxsw_core, u8 slot_index,
 	int status;
 	int err;
 
-	/* MCIA register accepts buffer size <= 48. Page of size 128 should be
-	 * read by chunks of size 48, 48, 32. Align the size of the last chunk
-	 * to avoid reading after the end of the page.
-	 */
-	size = min_t(u16, size, MLXSW_REG_MCIA_EEPROM_SIZE);
+	size = min_t(u16, size, mlxsw_env->max_eeprom_len);
 
 	if (offset < MLXSW_REG_MCIA_EEPROM_PAGE_LENGTH &&
 	    offset + size > MLXSW_REG_MCIA_EEPROM_PAGE_LENGTH)

@@ -489,7 +487,7 @@ mlxsw_env_get_module_eeprom_by_page(struct mlxsw_core *mlxsw_core,
 		u8 size;
 
 		size = min_t(u8, page->length - bytes_read,
-			     MLXSW_REG_MCIA_EEPROM_SIZE);
+			     mlxsw_env->max_eeprom_len);
 
 		mlxsw_reg_mcia_pack(mcia_pl, slot_index, module, page->page,
 				    device_addr + bytes_read, size,

@@ -1359,6 +1357,26 @@ static struct mlxsw_linecards_event_ops mlxsw_env_event_ops = {
 	.got_inactive = mlxsw_env_got_inactive,
 };
 
+static int mlxsw_env_max_module_eeprom_len_query(struct mlxsw_env *mlxsw_env)
+{
+	char mcam_pl[MLXSW_REG_MCAM_LEN];
+	bool mcia_128b_supported;
+	int err;
+
+	mlxsw_reg_mcam_pack(mcam_pl,
+			    MLXSW_REG_MCAM_FEATURE_GROUP_ENHANCED_FEATURES);
+	err = mlxsw_reg_query(mlxsw_env->core, MLXSW_REG(mcam), mcam_pl);
+	if (err)
+		return err;
+
+	mlxsw_reg_mcam_unpack(mcam_pl, MLXSW_REG_MCAM_MCIA_128B,
+			      &mcia_128b_supported);
+
+	mlxsw_env->max_eeprom_len = mcia_128b_supported ? 128 : 48;
+
+	return 0;
+}
+
 int mlxsw_env_init(struct mlxsw_core *mlxsw_core,
 		   const struct mlxsw_bus_info *bus_info,
 		   struct mlxsw_env **p_env)

@@ -1427,10 +1445,15 @@ int mlxsw_env_init(struct mlxsw_core *mlxsw_core,
 	if (err)
 		goto err_type_set;
 
+	err = mlxsw_env_max_module_eeprom_len_query(env);
+	if (err)
+		goto err_eeprom_len_query;
+
 	env->line_cards[0]->active = true;
 
 	return 0;
 
+err_eeprom_len_query:
 err_type_set:
 	mlxsw_env_module_event_disable(env, 0);
 err_mlxsw_env_module_event_enable:

index 71d42bcec0cd..d4ffba7473c6 100644
@@ -9699,7 +9699,6 @@ MLXSW_ITEM32(reg, mcia, size, 0x08, 0, 16);
 
 #define MLXSW_REG_MCIA_EEPROM_PAGE_LENGTH	256
 #define MLXSW_REG_MCIA_EEPROM_UP_PAGE_LENGTH	128
-#define MLXSW_REG_MCIA_EEPROM_SIZE		48
 #define MLXSW_REG_MCIA_I2C_ADDR_LOW		0x50
 #define MLXSW_REG_MCIA_I2C_ADDR_HIGH		0x51
 #define MLXSW_REG_MCIA_PAGE0_LO_OFF		0xa0

@@ -9736,7 +9735,7 @@ enum mlxsw_reg_mcia_eeprom_module_info {
  * Bytes to read/write.
  * Access: RW
  */
-MLXSW_ITEM_BUF(reg, mcia, eeprom, 0x10, MLXSW_REG_MCIA_EEPROM_SIZE);
+MLXSW_ITEM_BUF(reg, mcia, eeprom, 0x10, 128);
 
 /* This is used to access the optional upper pages (1-3) in the QSFP+
  * memory map. Page 1 is available on offset 256 through 383, page 2 -