i40e: Implement DDP support in i40e driver

This patch introduces DDP (Dynamic Device Personalization) which allows
loading profiles that change the way internal parser interprets processed
frames. To load DDP profiles it utilizes ethtool flash feature. The files
with recipes must be located in /var/lib/firmware directory. Afterwards
the recipe can be loaded by invoking:

    ethtool -f <if_name> <file_name> 100
    ethtool -f <if_name> - 100

See further details of this feature in the i40e documentation, or
visit
https://www.intel.com/content/www/us/en/architecture-and-technology/ethernet/dynamic-device-personalization-brief.html

The driver shall verify DDP profile can be loaded in accordance with
the rules:
* Package with Group ID 0 are exclusive and can only be loaded the first.
* Packages with Group ID 0x01-0xFE can only be loaded simultaneously
   with the packages from the same group.
* Packages with Group ID 0xFF are compatible with all other packages.

Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 231 insertions, 22 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_common.c b/drivers/net/ethernet/intel/i40e/i40e_common.c
index 97a9b1fb4763..486a406789b8 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_common.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_common.c
@@ -5448,6 +5448,163 @@ i40e_find_segment_in_package(u32 segment_type,
 	return NULL;
 }
 
+/* Get section table in profile */
+#define I40E_SECTION_TABLE(profile, sec_tbl)				\
+	do {								\
+		struct i40e_profile_segment *p = (profile);		\
+		u32 count;						\
+		u32 *nvm;						\
+		count = p->device_table_count;				\
+		nvm = (u32 *)&p->device_table[count];			\
+		sec_tbl = (struct i40e_section_table *)&nvm[nvm[0] + 1]; \
+	} while (0)
+
+/* Get section header in profile */
+#define I40E_SECTION_HEADER(profile, offset)				\
+	(struct i40e_profile_section_header *)((u8 *)(profile) + (offset))
+
+/**
+ * i40e_find_section_in_profile
+ * @section_type: the section type to search for (i.e., SECTION_TYPE_NOTE)
+ * @profile: pointer to the i40e segment header to be searched
+ *
+ * This function searches i40e segment for a particular section type. On
+ * success it returns a pointer to the section header, otherwise it will
+ * return NULL.
+ **/
+struct i40e_profile_section_header *
+i40e_find_section_in_profile(u32 section_type,
+			     struct i40e_profile_segment *profile)
+{
+	struct i40e_profile_section_header *sec;
+	struct i40e_section_table *sec_tbl;
+	u32 sec_off;
+	u32 i;
+
+	if (profile->header.type != SEGMENT_TYPE_I40E)
+		return NULL;
+
+	I40E_SECTION_TABLE(profile, sec_tbl);
+
+	for (i = 0; i < sec_tbl->section_count; i++) {
+		sec_off = sec_tbl->section_offset[i];
+		sec = I40E_SECTION_HEADER(profile, sec_off);
+		if (sec->section.type == section_type)
+			return sec;
+	}
+
+	return NULL;
+}
+
+/**
+ * i40e_ddp_exec_aq_section - Execute generic AQ for DDP
+ * @hw: pointer to the hw struct
+ * @aq: command buffer containing all data to execute AQ
+ **/
+static enum
+i40e_status_code i40e_ddp_exec_aq_section(struct i40e_hw *hw,
+					  struct i40e_profile_aq_section *aq)
+{
+	i40e_status status;
+	struct i40e_aq_desc desc;
+	u8 *msg = NULL;
+	u16 msglen;
+
+	i40e_fill_default_direct_cmd_desc(&desc, aq->opcode);
+	desc.flags |= cpu_to_le16(aq->flags);
+	memcpy(desc.params.raw, aq->param, sizeof(desc.params.raw));
+
+	msglen = aq->datalen;
+	if (msglen) {
+		desc.flags |= cpu_to_le16((u16)(I40E_AQ_FLAG_BUF |
+						I40E_AQ_FLAG_RD));
+		if (msglen > I40E_AQ_LARGE_BUF)
+			desc.flags |= cpu_to_le16((u16)I40E_AQ_FLAG_LB);
+		desc.datalen = cpu_to_le16(msglen);
+		msg = &aq->data[0];
+	}
+
+	status = i40e_asq_send_command(hw, &desc, msg, msglen, NULL);
+
+	if (status) {
+		i40e_debug(hw, I40E_DEBUG_PACKAGE,
+			   "unable to exec DDP AQ opcode %u, error %d\n",
+			   aq->opcode, status);
+		return status;
+	}
+
+	/* copy returned desc to aq_buf */
+	memcpy(aq->param, desc.params.raw, sizeof(desc.params.raw));
+
+	return 0;
+}
+
+/**
+ * i40e_validate_profile
+ * @hw: pointer to the hardware structure
+ * @profile: pointer to the profile segment of the package to be validated
+ * @track_id: package tracking id
+ * @rollback: flag if the profile is for rollback.
+ *
+ * Validates supported devices and profile's sections.
+ */
+static enum i40e_status_code
+i40e_validate_profile(struct i40e_hw *hw, struct i40e_profile_segment *profile,
+		      u32 track_id, bool rollback)
+{
+	struct i40e_profile_section_header *sec = NULL;
+	i40e_status status = 0;
+	struct i40e_section_table *sec_tbl;
+	u32 vendor_dev_id;
+	u32 dev_cnt;
+	u32 sec_off;
+	u32 i;
+
+	if (track_id == I40E_DDP_TRACKID_INVALID) {
+		i40e_debug(hw, I40E_DEBUG_PACKAGE, "Invalid track_id\n");
+		return I40E_NOT_SUPPORTED;
+	}
+
+	dev_cnt = profile->device_table_count;
+	for (i = 0; i < dev_cnt; i++) {
+		vendor_dev_id = profile->device_table[i].vendor_dev_id;
+		if ((vendor_dev_id >> 16) == PCI_VENDOR_ID_INTEL &&
+		    hw->device_id == (vendor_dev_id & 0xFFFF))
+			break;
+	}
+	if (dev_cnt && i == dev_cnt) {
+		i40e_debug(hw, I40E_DEBUG_PACKAGE,
+			   "Device doesn't support DDP\n");
+		return I40E_ERR_DEVICE_NOT_SUPPORTED;
+	}
+
+	I40E_SECTION_TABLE(profile, sec_tbl);
+
+	/* Validate sections types */
+	for (i = 0; i < sec_tbl->section_count; i++) {
+		sec_off = sec_tbl->section_offset[i];
+		sec = I40E_SECTION_HEADER(profile, sec_off);
+		if (rollback) {
+			if (sec->section.type == SECTION_TYPE_MMIO ||
+			    sec->section.type == SECTION_TYPE_AQ ||
+			    sec->section.type == SECTION_TYPE_RB_AQ) {
+				i40e_debug(hw, I40E_DEBUG_PACKAGE,
+					   "Not a roll-back package\n");
+				return I40E_NOT_SUPPORTED;
+			}
+		} else {
+			if (sec->section.type == SECTION_TYPE_RB_AQ ||
+			    sec->section.type == SECTION_TYPE_RB_MMIO) {
+				i40e_debug(hw, I40E_DEBUG_PACKAGE,
+					   "Not an original package\n");
+				return I40E_NOT_SUPPORTED;
+			}
+		}
+	}
+
+	return status;
+}
+
 /**
  * i40e_write_profile
  * @hw: pointer to the hardware structure
@@ -5463,47 +5620,99 @@ i40e_write_profile(struct i40e_hw *hw, struct i40e_profile_segment *profile,
 	i40e_status status = 0;
 	struct i40e_section_table *sec_tbl;
 	struct i40e_profile_section_header *sec = NULL;
-	u32 dev_cnt;
-	u32 vendor_dev_id;
-	u32 *nvm;
+	struct i40e_profile_aq_section *ddp_aq;
 	u32 section_size = 0;
 	u32 offset = 0, info = 0;
+	u32 sec_off;
 	u32 i;
 
-	dev_cnt = profile->device_table_count;
+	status = i40e_validate_profile(hw, profile, track_id, false);
+	if (status)
+		return status;
 
-	for (i = 0; i < dev_cnt; i++) {
-		vendor_dev_id = profile->device_table[i].vendor_dev_id;
-		if ((vendor_dev_id >> 16) == PCI_VENDOR_ID_INTEL)
-			if (hw->device_id == (vendor_dev_id & 0xFFFF))
+	I40E_SECTION_TABLE(profile, sec_tbl);
+
+	for (i = 0; i < sec_tbl->section_count; i++) {
+		sec_off = sec_tbl->section_offset[i];
+		sec = I40E_SECTION_HEADER(profile, sec_off);
+		/* Process generic admin command */
+		if (sec->section.type == SECTION_TYPE_AQ) {
+			ddp_aq = (struct i40e_profile_aq_section *)&sec[1];
+			status = i40e_ddp_exec_aq_section(hw, ddp_aq);
+			if (status) {
+				i40e_debug(hw, I40E_DEBUG_PACKAGE,
+					   "Failed to execute aq: section %d, opcode %u\n",
+					   i, ddp_aq->opcode);
 				break;
+			}
+			sec->section.type = SECTION_TYPE_RB_AQ;
+		}
+
+		/* Skip any non-mmio sections */
+		if (sec->section.type != SECTION_TYPE_MMIO)
+			continue;
+
+		section_size = sec->section.size +
+			sizeof(struct i40e_profile_section_header);
+
+		/* Write MMIO section */
+		status = i40e_aq_write_ddp(hw, (void *)sec, (u16)section_size,
+					   track_id, &offset, &info, NULL);
+		if (status) {
+			i40e_debug(hw, I40E_DEBUG_PACKAGE,
+				   "Failed to write profile: section %d, offset %d, info %d\n",
+				   i, offset, info);
+			break;
+		}
 	}
-	if (i == dev_cnt) {
-		i40e_debug(hw, I40E_DEBUG_PACKAGE, "Device doesn't support DDP");
-		return I40E_ERR_DEVICE_NOT_SUPPORTED;
-	}
+	return status;
+}
+
+/**
+ * i40e_rollback_profile
+ * @hw: pointer to the hardware structure
+ * @profile: pointer to the profile segment of the package to be removed
+ * @track_id: package tracking id
+ *
+ * Rolls back previously loaded package.
+ */
+enum i40e_status_code
+i40e_rollback_profile(struct i40e_hw *hw, struct i40e_profile_segment *profile,
+		      u32 track_id)
+{
+	struct i40e_profile_section_header *sec = NULL;
+	i40e_status status = 0;
+	struct i40e_section_table *sec_tbl;
+	u32 offset = 0, info = 0;
+	u32 section_size = 0;
+	u32 sec_off;
+	int i;
 
-	nvm = (u32 *)&profile->device_table[dev_cnt];
-	sec_tbl = (struct i40e_section_table *)&nvm[nvm[0] + 1];
+	status = i40e_validate_profile(hw, profile, track_id, true);
+	if (status)
+		return status;
 
-	for (i = 0; i < sec_tbl->section_count; i++) {
-		sec = (struct i40e_profile_section_header *)((u8 *)profile +
-					     sec_tbl->section_offset[i]);
+	I40E_SECTION_TABLE(profile, sec_tbl);
 
-		/* Skip 'AQ', 'note' and 'name' sections */
-		if (sec->section.type != SECTION_TYPE_MMIO)
+	/* For rollback write sections in reverse */
+	for (i = sec_tbl->section_count - 1; i >= 0; i--) {
+		sec_off = sec_tbl->section_offset[i];
+		sec = I40E_SECTION_HEADER(profile, sec_off);
+
+		/* Skip any non-rollback sections */
+		if (sec->section.type != SECTION_TYPE_RB_MMIO)
 			continue;
 
 		section_size = sec->section.size +
 			sizeof(struct i40e_profile_section_header);
 
-		/* Write profile */
+		/* Write roll-back MMIO section */
 		status = i40e_aq_write_ddp(hw, (void *)sec, (u16)section_size,
 					   track_id, &offset, &info, NULL);
 		if (status) {
 			i40e_debug(hw, I40E_DEBUG_PACKAGE,
-				   "Failed to write profile: offset %d, info %d",
-				   offset, info);
+				   "Failed to write profile: section %d, offset %d, info %d\n",
+				   i, offset, info);
 			break;
 		}
 	}