diff --git a/net/ethtool/cmis.h b/net/ethtool/cmis.h
index 73a5060d0f4c..1e790413db0e 100644
--- a/net/ethtool/cmis.h
+++ b/net/ethtool/cmis.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #define ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH		120
+#define ETHTOOL_CMIS_CDB_EPL_MAX_PL_LENGTH		2048
 #define ETHTOOL_CMIS_CDB_CMD_PAGE			0x9F
 #define ETHTOOL_CMIS_CDB_PAGE_I2C_ADDR			0x50
 
@@ -23,6 +24,7 @@ enum ethtool_cmis_cdb_cmd_id {
 	ETHTOOL_CMIS_CDB_CMD_FW_MANAGMENT_FEATURES	= 0x0041,
 	ETHTOOL_CMIS_CDB_CMD_START_FW_DOWNLOAD		= 0x0101,
 	ETHTOOL_CMIS_CDB_CMD_WRITE_FW_BLOCK_LPL		= 0x0103,
+	ETHTOOL_CMIS_CDB_CMD_WRITE_FW_BLOCK_EPL		= 0x0104,
 	ETHTOOL_CMIS_CDB_CMD_COMPLETE_FW_DOWNLOAD	= 0x0107,
 	ETHTOOL_CMIS_CDB_CMD_RUN_FW_IMAGE		= 0x0109,
 	ETHTOOL_CMIS_CDB_CMD_COMMIT_FW_IMAGE		= 0x010A,
@@ -38,6 +40,7 @@ enum ethtool_cmis_cdb_cmd_id {
  * @resv1: Added to match the CMIS standard request continuity.
  * @resv2: Added to match the CMIS standard request continuity.
  * @payload: Payload for the CDB commands.
+ * @epl: Extended payload for the CDB commands.
  */
 struct ethtool_cmis_cdb_request {
 	__be16 id;
@@ -49,6 +52,7 @@ struct ethtool_cmis_cdb_request {
 		u8 resv2;
 		u8 payload[ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH];
 	);
+	u8 *epl;	/* Everything above this field checksummed. */
 };
 
 #define CDB_F_COMPLETION_VALID		BIT(0)
diff --git a/net/ethtool/cmis_cdb.c b/net/ethtool/cmis_cdb.c
index 80bb475fd52a..d159dc121bde 100644
--- a/net/ethtool/cmis_cdb.c
+++ b/net/ethtool/cmis_cdb.c
@@ -33,12 +33,19 @@ void ethtool_cmis_cdb_compose_args(struct ethtool_cmis_cdb_cmd_args *args,
 {
 	args->req.id = cpu_to_be16(cmd);
 	args->req.lpl_len = lpl_len;
-	if (lpl)
+	if (lpl) {
 		memcpy(args->req.payload, lpl, args->req.lpl_len);
+		args->read_write_len_ext =
+			ethtool_cmis_get_max_lpl_size(read_write_len_ext);
+	}
+	if (epl) {
+		args->req.epl_len = cpu_to_be16(epl_len);
+		args->req.epl = epl;
+		args->read_write_len_ext =
+			ethtool_cmis_get_max_epl_size(read_write_len_ext);
+	}
 
 	args->max_duration = max_duration;
-	args->read_write_len_ext =
-		ethtool_cmis_get_max_lpl_size(read_write_len_ext);
 	args->msleep_pre_rpl = msleep_pre_rpl;
 	args->rpl_exp_len = rpl_exp_len;
 	args->flags = flags;
@@ -556,6 +563,49 @@ __ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
 	return err;
 }
 
+#define CMIS_CDB_EPL_PAGE_START			0xA0
+#define CMIS_CDB_EPL_PAGE_END			0xAF
+#define CMIS_CDB_EPL_FW_BLOCK_OFFSET_START	128
+#define CMIS_CDB_EPL_FW_BLOCK_OFFSET_END	255
+
+static int
+ethtool_cmis_cdb_execute_epl_cmd(struct net_device *dev,
+				 struct ethtool_cmis_cdb_cmd_args *args,
+				 struct ethtool_module_eeprom *page_data)
+{
+	u16 epl_len = be16_to_cpu(args->req.epl_len);
+	u32 bytes_written = 0;
+	u8 page;
+	int err;
+
+	for (page = CMIS_CDB_EPL_PAGE_START;
+	     page <= CMIS_CDB_EPL_PAGE_END && bytes_written < epl_len; page++) {
+		u16 offset = CMIS_CDB_EPL_FW_BLOCK_OFFSET_START;
+
+		while (offset <= CMIS_CDB_EPL_FW_BLOCK_OFFSET_END &&
+		       bytes_written < epl_len) {
+			u32 bytes_left = epl_len - bytes_written;
+			u16 space_left, bytes_to_write;
+
+			space_left = CMIS_CDB_EPL_FW_BLOCK_OFFSET_END - offset + 1;
+			bytes_to_write = min_t(u16, bytes_left,
+					       min_t(u16, space_left,
+						     args->read_write_len_ext));
+
+			err = __ethtool_cmis_cdb_execute_cmd(dev, page_data,
+							     page, offset,
+							     bytes_to_write,
+							     args->req.epl + bytes_written);
+			if (err < 0)
+				return err;
+
+			offset += bytes_to_write;
+			bytes_written += bytes_to_write;
+		}
+	}
+	return 0;
+}
+
 static u8 cmis_cdb_calc_checksum(const void *data, size_t size)
 {
 	const u8 *bytes = (const u8 *)data;
@@ -577,7 +627,9 @@ int ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
 	int err;
 
 	args->req.chk_code =
-		cmis_cdb_calc_checksum(&args->req, sizeof(args->req));
+		cmis_cdb_calc_checksum(&args->req,
+				       offsetof(struct ethtool_cmis_cdb_request,
+						epl));
 
 	if (args->req.lpl_len > args->read_write_len_ext) {
 		args->err_msg = "LPL length is longer than CDB read write length extension allows";
@@ -599,6 +651,12 @@ int ethtool_cmis_cdb_execute_cmd(struct net_device *dev,
 	if (err < 0)
 		return err;
 
+	if (args->req.epl_len) {
+		err = ethtool_cmis_cdb_execute_epl_cmd(dev, args, &page_data);
+		if (err < 0)
+			return err;
+	}
+
 	offset = CMIS_CDB_CMD_ID_OFFSET +
 		offsetof(struct ethtool_cmis_cdb_request, id);
 	err = __ethtool_cmis_cdb_execute_cmd(dev, &page_data,
diff --git a/net/ethtool/cmis_fw_update.c b/net/ethtool/cmis_fw_update.c
index a514127985d4..48aef6220f00 100644
--- a/net/ethtool/cmis_fw_update.c
+++ b/net/ethtool/cmis_fw_update.c
@@ -9,6 +9,7 @@
 
 struct cmis_fw_update_fw_mng_features {
 	u8	start_cmd_payload_size;
+	u8	write_mechanism;
 	u16	max_duration_start;
 	u16	max_duration_write;
 	u16	max_duration_complete;
@@ -36,7 +37,9 @@ struct cmis_cdb_fw_mng_features_rpl {
 };
 
 enum cmis_cdb_fw_write_mechanism {
+	CMIS_CDB_FW_WRITE_MECHANISM_NONE	= 0x00,
 	CMIS_CDB_FW_WRITE_MECHANISM_LPL		= 0x01,
+	CMIS_CDB_FW_WRITE_MECHANISM_EPL		= 0x10,
 	CMIS_CDB_FW_WRITE_MECHANISM_BOTH	= 0x11,
 };
 
@@ -68,10 +71,9 @@ cmis_fw_update_fw_mng_features_get(struct ethtool_cmis_cdb *cdb,
 	}
 
 	rpl = (struct cmis_cdb_fw_mng_features_rpl *)args.req.payload;
-	if (!(rpl->write_mechanism == CMIS_CDB_FW_WRITE_MECHANISM_LPL ||
-	      rpl->write_mechanism == CMIS_CDB_FW_WRITE_MECHANISM_BOTH)) {
+	if (rpl->write_mechanism == CMIS_CDB_FW_WRITE_MECHANISM_NONE) {
 		ethnl_module_fw_flash_ntf_err(dev, ntf_params,
-					      "Write LPL is not supported",
+					      "CDB write mechanism is not supported",
 					      NULL);
 		return  -EOPNOTSUPP;
 	}
@@ -83,6 +85,10 @@ cmis_fw_update_fw_mng_features_get(struct ethtool_cmis_cdb *cdb,
 	 */
 	cdb->read_write_len_ext = rpl->read_write_len_ext;
 	fw_mng->start_cmd_payload_size = rpl->start_cmd_payload_size;
+	fw_mng->write_mechanism =
+		rpl->write_mechanism == CMIS_CDB_FW_WRITE_MECHANISM_LPL ?
+		CMIS_CDB_FW_WRITE_MECHANISM_LPL :
+		CMIS_CDB_FW_WRITE_MECHANISM_EPL;
 	fw_mng->max_duration_start = be16_to_cpu(rpl->max_duration_start);
 	fw_mng->max_duration_write = be16_to_cpu(rpl->max_duration_write);
 	fw_mng->max_duration_complete = be16_to_cpu(rpl->max_duration_complete);
@@ -149,9 +155,9 @@ struct cmis_cdb_write_fw_block_lpl_pl {
 };
 
 static int
-cmis_fw_update_write_image(struct ethtool_cmis_cdb *cdb,
-			   struct ethtool_cmis_fw_update_params *fw_update,
-			   struct cmis_fw_update_fw_mng_features *fw_mng)
+cmis_fw_update_write_image_lpl(struct ethtool_cmis_cdb *cdb,
+			       struct ethtool_cmis_fw_update_params *fw_update,
+			       struct cmis_fw_update_fw_mng_features *fw_mng)
 {
 	u8 start = fw_mng->start_cmd_payload_size;
 	u32 offset, max_block_size, max_lpl_len;
@@ -202,6 +208,67 @@ cmis_fw_update_write_image(struct ethtool_cmis_cdb *cdb,
 	return 0;
 }
 
+struct cmis_cdb_write_fw_block_epl_pl {
+	u8 fw_block[ETHTOOL_CMIS_CDB_EPL_MAX_PL_LENGTH];
+};
+
+static int
+cmis_fw_update_write_image_epl(struct ethtool_cmis_cdb *cdb,
+			       struct ethtool_cmis_fw_update_params *fw_update,
+			       struct cmis_fw_update_fw_mng_features *fw_mng)
+{
+	u8 start = fw_mng->start_cmd_payload_size;
+	u32 image_size = fw_update->fw->size;
+	u32 offset, lpl_len;
+	int err;
+
+	lpl_len = sizeof_field(struct cmis_cdb_write_fw_block_lpl_pl,
+			       block_address);
+
+	for (offset = start; offset < image_size;
+	     offset += ETHTOOL_CMIS_CDB_EPL_MAX_PL_LENGTH) {
+		struct cmis_cdb_write_fw_block_lpl_pl lpl = {
+			.block_address = cpu_to_be32(offset - start),
+		};
+		struct cmis_cdb_write_fw_block_epl_pl *epl;
+		struct ethtool_cmis_cdb_cmd_args args = {};
+		u32 epl_len;
+
+		ethnl_module_fw_flash_ntf_in_progress(fw_update->dev,
+						      &fw_update->ntf_params,
+						      offset - start,
+						      image_size);
+
+		epl_len = min_t(u32, ETHTOOL_CMIS_CDB_EPL_MAX_PL_LENGTH,
+				image_size - offset);
+		epl = kmalloc_array(epl_len, sizeof(u8), GFP_KERNEL);
+		if (!epl)
+			return -ENOMEM;
+
+		memcpy(epl->fw_block, &fw_update->fw->data[offset], epl_len);
+
+		ethtool_cmis_cdb_compose_args(&args,
+					      ETHTOOL_CMIS_CDB_CMD_WRITE_FW_BLOCK_EPL,
+					      (u8 *)&lpl, lpl_len, (u8 *)epl,
+					      epl_len,
+					      fw_mng->max_duration_write,
+					      cdb->read_write_len_ext, 1, 0,
+					      CDB_F_COMPLETION_VALID | CDB_F_STATUS_VALID);
+
+		err = ethtool_cmis_cdb_execute_cmd(fw_update->dev, &args);
+		kfree(epl);
+		if (err < 0) {
+			ethnl_module_fw_flash_ntf_err(fw_update->dev,
+						      &fw_update->ntf_params,
+						      "Write FW block EPL command failed",
+						      args.err_msg);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
 static int
 cmis_fw_update_complete_download(struct ethtool_cmis_cdb *cdb,
 				 struct net_device *dev,
@@ -238,9 +305,15 @@ cmis_fw_update_download_image(struct ethtool_cmis_cdb *cdb,
 	if (err < 0)
 		return err;
 
-	err = cmis_fw_update_write_image(cdb, fw_update, fw_mng);
-	if (err < 0)
-		return err;
+	if (fw_mng->write_mechanism == CMIS_CDB_FW_WRITE_MECHANISM_LPL) {
+		err = cmis_fw_update_write_image_lpl(cdb, fw_update, fw_mng);
+		if (err < 0)
+			return err;
+	} else {
+		err = cmis_fw_update_write_image_epl(cdb, fw_update, fw_mng);
+		if (err < 0)
+			return err;
+	}
 
 	err = cmis_fw_update_complete_download(cdb, fw_update->dev, fw_mng,
 					       &fw_update->ntf_params);