optoe: Add CMIS Bank support for transceivers with >8 lanes #473
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| Original file line number | Diff line number | Diff line change | ||||
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| @@ -0,0 +1,361 @@ | ||||||
| From baef70561c79d0e34d79bfc011edfbec585e5d24 Mon Sep 17 00:00:00 2001 | ||||||
| From: Wataru Ishida <wataru.ishid@gmail.com> | ||||||
| Date: Sun, 15 Feb 2026 22:34:29 +0900 | ||||||
| Subject: [PATCH] optoe: Add CMIS Bank support for transceivers with >8 lanes | ||||||
|
|
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| This patch adds CMIS Bank support to the 'optoe3' device class in order | ||||||
| to enable access to CMIS transceivers with more than 8 lanes (e.g., OSFP-XD, CPO OEs). | ||||||
|
|
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| - Bank support can be enabled only for the 'optoe3' dev class. | ||||||
| - 'bank_size' sysfs entry is added to enable and configure the size of the bank. | ||||||
| - By default, bank size is set to 0. | ||||||
|
|
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| Signed-off-by: Wataru Ishida <wataru.ishid@gmail.com> | ||||||
|
|
||||||
| --- | ||||||
| drivers/misc/eeprom/optoe.c | 198 +++++++++++++++++++++++++++++++----- | ||||||
| 1 file changed, 171 insertions(+), 27 deletions(-) | ||||||
|
|
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| diff --git a/drivers/misc/eeprom/optoe.c b/drivers/misc/eeprom/optoe.c | ||||||
| index ba4ca17..0d575aa 100644 | ||||||
| --- a/drivers/misc/eeprom/optoe.c | ||||||
| +++ b/drivers/misc/eeprom/optoe.c | ||||||
| @@ -101,9 +101,50 @@ | ||||||
| * considerably more pages (at least to page 0xAF), which this driver | ||||||
| * supports. | ||||||
| * | ||||||
| - * NOTE: This version of the driver ONLY SUPPORTS BANK 0 PAGES on CMIS | ||||||
| - * devices. | ||||||
| + * For CMIS transceivers that support Banked Pages, access to these pages | ||||||
| + * is also supported. To access the banked pages, set the number of banks | ||||||
| + * to access via the `bank_size` sysfs entry. | ||||||
| + * By default, `bank_size` is set to 0, which disables this feature. | ||||||
|
Contributor
There was a problem hiding this comment. @ishidawataru We probably don't need this. see my comments above. |
||||||
| * | ||||||
| + * The maximum number of banks supported in this version is 8. | ||||||
| + * | ||||||
| + * When access to the Banked Pages is enabled, they are mapped into a linear | ||||||
| + * address space. The mapping starts right after the Non-Banked Page area, | ||||||
| + * as shown below. | ||||||
| + * | ||||||
| + * Note that support for memory pages varies by device. If the device does not | ||||||
| + * support a requested page, it should overwrite the PageSelect register to 0 and | ||||||
| + * return the data from page 0 following the behavior defined in CMIS 5.3 8.2.15. | ||||||
| + * | ||||||
| + * Since this driver does not validate the PageSelect register value after each | ||||||
| + * write, applications should verify page and bank support through device | ||||||
| + * advertisement registers or the datasheet. | ||||||
| + * | ||||||
| + * +-------------------------------+ | ||||||
| + * | Lower Page | | ||||||
| + * +-------------------------------+ | ||||||
| + * | Upper Page (Bank 0, Page 0h) | | ||||||
| + * +-------------------------------+ | ||||||
| + * | Upper Page (Bank 0, Page 1h) | | ||||||
| + * +-------------------------------+ | ||||||
| + * | ... | | ||||||
| + * +-------------------------------+ | ||||||
| + * | Upper Page (Bank 0, Page FFh) | | ||||||
| + * +-------------------------------+ | ||||||
| + * | Upper Page (Bank 1, Page 0h) | | ||||||
| + * +-------------------------------+ | ||||||
| + * | ... | | ||||||
| + * +-------------------------------+ | ||||||
| + * | Upper Page (Bank 1, Page FFh) | | ||||||
| + * +-------------------------------+ | ||||||
| + * | Upper Page (Bank 2, Page 0h) | | ||||||
| + * +-------------------------------+ | ||||||
| + * | ... | | ||||||
| + * +-------------------------------+ | ||||||
| + * | Upper Page (Bank 2, Page FFh) | | ||||||
| + * +-------------------------------+ | ||||||
| + * | ... | | ||||||
| + * (continued for more banks) | ||||||
| **/ | ||||||
|
|
||||||
| /* #define DEBUG 1 */ | ||||||
| @@ -150,6 +191,17 @@ struct optoe_platform_data { | ||||||
|
|
||||||
| /* fundamental unit of addressing for EEPROM */ | ||||||
| #define OPTOE_PAGE_SIZE 128 | ||||||
| + | ||||||
| +/* | ||||||
| + * By default, banked pages are not supported (bank_size = 0), which limits | ||||||
| + * the maximum linear address space to 256 pages (32KB). When bank_size is | ||||||
| + * greater than 0, the driver supports access to additional banked pages, with | ||||||
| + * the total address space increasing by 256 pages (32KB) for each additional bank. | ||||||
| + * The maximum supported bank size in this version is 8. | ||||||
| + */ | ||||||
| +#define OPTOE_DEFAULT_BANK_SIZE 0 | ||||||
|
Contributor
There was a problem hiding this comment. @ishidawataru the default bank is 0, which means modules that support 8 lanes, the bank size = 1?
Contributor
There was a problem hiding this comment. @ishidawataru This probably can be removed if we implement full range of linear address for all bank pages. See my comments below |
||||||
| +#define OPTOE_MAX_SUPPORTED_BANK_SIZE 8 | ||||||
| + | ||||||
| /* | ||||||
| * Single address devices (eg QSFP) have 256 pages, plus the unpaged | ||||||
| * low 128 bytes. If the device does not support paging, it is | ||||||
| @@ -168,6 +220,7 @@ struct optoe_platform_data { | ||||||
| #define TWO_ADDR_NO_0X51_SIZE (2 * OPTOE_PAGE_SIZE) | ||||||
|
|
||||||
| /* a few constants to find our way around the EEPROM */ | ||||||
| +#define OPTOE_BANK_SELECT_REG 0x7E | ||||||
| #define OPTOE_PAGE_SELECT_REG 0x7F | ||||||
| #define ONE_ADDR_PAGEABLE_REG 0x02 | ||||||
| #define QSFP_NOT_PAGEABLE (1<<2) | ||||||
| @@ -195,6 +248,13 @@ struct optoe_data { | ||||||
| u8 *writebuf; | ||||||
| unsigned int write_max; | ||||||
| unsigned int write_timeout; | ||||||
| + unsigned int bank_size; /* 0 means bank is not supported */ | ||||||
| + | ||||||
| + /* Indicates if page restore has failed. | ||||||
| + * If true, the driver doesn't skip writing to page select register | ||||||
| + * even for acesses to page 0. | ||||||
|
There was a problem hiding this comment. Spelling error: "acesses" should be "accesses".
Suggested change
|
||||||
| + */ | ||||||
| + bool page_restore_failed; | ||||||
|
|
||||||
| unsigned int num_addresses; | ||||||
|
|
||||||
| @@ -245,13 +305,19 @@ static const struct i2c_device_id optoe_ids[] = { | ||||||
| }; | ||||||
| MODULE_DEVICE_TABLE(i2c, optoe_ids); | ||||||
|
|
||||||
| +static uint32_t one_addr_eeprom_size_with_bank(uint32_t bank_size) | ||||||
| +{ | ||||||
| + bank_size = bank_size == 0 ? 1 : bank_size; | ||||||
| + return (bank_size * OPTOE_ARCH_PAGES + 1) * OPTOE_PAGE_SIZE; | ||||||
| +} | ||||||
| + | ||||||
| /*-------------------------------------------------------------------------*/ | ||||||
| /* | ||||||
| * This routine computes the addressing information to be used for | ||||||
| * a given r/w request. | ||||||
| * | ||||||
| * Task is to calculate the client (0 = i2c addr 50, 1 = i2c addr 51), | ||||||
| - * the page, and the offset. | ||||||
| + * the bank, the page, and the offset. | ||||||
| * | ||||||
| * Handles both single address (eg QSFP) and two address (eg SFP). | ||||||
| * For SFP, offset 0-255 are on client[0], >255 is on client[1] | ||||||
| @@ -274,7 +340,7 @@ MODULE_DEVICE_TABLE(i2c, optoe_ids); | ||||||
| */ | ||||||
|
|
||||||
| static uint8_t optoe_translate_offset(struct optoe_data *optoe, | ||||||
| - loff_t *offset, struct i2c_client **client) | ||||||
| + loff_t *offset, struct i2c_client **client, uint8_t *bank) | ||||||
| { | ||||||
| unsigned int page = 0; | ||||||
|
|
||||||
| @@ -297,12 +363,17 @@ static uint8_t optoe_translate_offset(struct optoe_data *optoe, | ||||||
| if (*offset < OPTOE_PAGE_SIZE) | ||||||
| return page; | ||||||
|
|
||||||
| - /* note, page will always be positive since *offset >= 128 */ | ||||||
| - page = (*offset >> 7)-1; | ||||||
| - /* 0x80 places the offset in the top half, offset is last 7 bits */ | ||||||
| - *offset = OPTOE_PAGE_SIZE + (*offset & 0x7f); | ||||||
| + /* | ||||||
| + * Calculate bank, page, and physical offset for paged EEPROM access. | ||||||
| + * Memory layout: multiple banks, each containing 256 pages of 128 bytes. | ||||||
| + */ | ||||||
| + loff_t offset_in_paged_area = *offset - OPTOE_PAGE_SIZE; | ||||||
| + const size_t bytes_per_bank = OPTOE_ARCH_PAGES * OPTOE_PAGE_SIZE; // 256 * 128 = 32KB | ||||||
|
There was a problem hiding this comment. Use C-style comment syntax /* / instead of C++ style //. Kernel code should use C-style comments for inline code comments. The comment should be: / 256 * 128 = 32KB */
Suggested change
|
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| + *bank = offset_in_paged_area / bytes_per_bank; | ||||||
| + page = (offset_in_paged_area / OPTOE_PAGE_SIZE) % OPTOE_ARCH_PAGES; | ||||||
| + *offset = OPTOE_PAGE_SIZE + (offset_in_paged_area % OPTOE_PAGE_SIZE); | ||||||
|
|
||||||
| - return page; /* note also returning client and offset */ | ||||||
|
Contributor
There was a problem hiding this comment. @ishidawataru The computation does not consider full range of linear address for all banks. Its OK to use all page address for bank 0 i.e Assume that page 0x10, 0x11, 0x12... 0xFF exist for Bank 0 as well. So that the getaddr() can be implemented as follows:- In your case you are not wasting the address space for Here is the simple decoding of the above linear address that optoe needs to do:- Assumption here is the user application will provide only the valid pages and the module will return IO error if incorrect Page address is selected.
Author
There was a problem hiding this comment. @prgeor This is the linear address map of the current implementation. Are you suggesting to change it like below?
Returning I/O errors for the grayed-out area will prevent us from using cat on the EEPROM file as shown below. I suggest keeping the current implementation or returning the value from bank 0, rather than returning I/O errors. What do you think?
Contributor
There was a problem hiding this comment. @ishidawataru I am not sure if
Author
There was a problem hiding this comment. Following our offline discussion, I've updated the memory map as suggested. 
|
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| + return page; /* note also returning client, bank and offset */ | ||||||
| } | ||||||
|
|
||||||
| static ssize_t optoe_eeprom_read(struct optoe_data *optoe, | ||||||
| @@ -511,23 +582,44 @@ static ssize_t optoe_eeprom_update_client(struct optoe_data *optoe, | ||||||
| { | ||||||
| struct i2c_client *client; | ||||||
| ssize_t retval = 0; | ||||||
| - uint8_t page = 0; | ||||||
| + uint8_t page = 0, bank = 0; | ||||||
| loff_t phy_offset = off; | ||||||
| int ret = 0; | ||||||
|
|
||||||
| - page = optoe_translate_offset(optoe, &phy_offset, &client); | ||||||
| + page = optoe_translate_offset(optoe, &phy_offset, &client, &bank); | ||||||
| dev_dbg(&client->dev, | ||||||
| - "%s off %lld page:%d phy_offset:%lld, count:%ld, opcode:%d\n", | ||||||
| - __func__, off, page, phy_offset, (long int) count, opcode); | ||||||
| - if (page > 0) { | ||||||
| - ret = optoe_eeprom_write(optoe, client, &page, | ||||||
| - OPTOE_PAGE_SELECT_REG, 1); | ||||||
| + "%s off %lld bank:%d page:%d phy_offset:%lld, count:%ld, opcode:%d\n", | ||||||
| + __func__, off, bank, page, phy_offset, (long int) count, opcode); | ||||||
| + if (optoe->page_restore_failed || page > 0) { | ||||||
| + /* | ||||||
| + * CMIS 5.3 8.2.15 Page Mapping | ||||||
| + * | ||||||
| + * For an arbitrary Page Address change or for just a Bank Index change, | ||||||
| + * a host must write both BankSelect and PageSelect in one WRITE access, | ||||||
| + * even if the PageSelect value does not change. | ||||||
| + * The module does not begin processing the BankSelect value until after the PageSelect register has been written. | ||||||
| + * | ||||||
| + * For just a Page Index change (mapping another Page in the current Bank), | ||||||
| + * or for mapping an arbitrary unbanked Page to Upper Memory, a host may WRITE only the PageSelect Byte. | ||||||
| + */ | ||||||
| + if (bank > 0) { | ||||||
|
Contributor
There was a problem hiding this comment. @ishidawataru would it be good to have the sanity check to validate the bank value to what the module supports? Page 01h, Byte 142 |
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| + char buf[2] = {bank, page}; | ||||||
| + unsigned int write_max_orig = optoe->write_max; | ||||||
| + optoe->write_max = 2; /* ensure both bank and page are written together */ | ||||||
| + ret = optoe_eeprom_write(optoe, client, buf, | ||||||
| + OPTOE_BANK_SELECT_REG, 2); | ||||||
| + optoe->write_max = write_max_orig; | ||||||
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|
||||||
| + } else { | ||||||
| + ret = optoe_eeprom_write(optoe, client, &page, | ||||||
| + OPTOE_PAGE_SELECT_REG, 1); | ||||||
| + } | ||||||
| if (ret < 0) { | ||||||
| dev_dbg(&client->dev, | ||||||
| - "Write page register for page %d failed ret:%d!\n", | ||||||
| - page, ret); | ||||||
| + "Write page register for bank %d, page %d failed ret:%d!\n", | ||||||
| + bank, page, ret); | ||||||
| return ret; | ||||||
| } | ||||||
| + optoe->page_restore_failed = false; | ||||||
| } | ||||||
|
|
||||||
| while (count) { | ||||||
| @@ -553,13 +645,23 @@ static ssize_t optoe_eeprom_update_client(struct optoe_data *optoe, | ||||||
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|
|
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| if (page > 0) { | ||||||
| - /* return the page register to page 0 (why?) */ | ||||||
| - page = 0; | ||||||
| - ret = optoe_eeprom_write(optoe, client, &page, | ||||||
| - OPTOE_PAGE_SELECT_REG, 1); | ||||||
| + if (bank > 0) { | ||||||
| + char buf[2] = {0, 0}; | ||||||
| + unsigned int write_max_orig = optoe->write_max; | ||||||
| + optoe->write_max = 2; /* ensure both bank and page are written together */ | ||||||
| + ret = optoe_eeprom_write(optoe, client, buf, | ||||||
| + OPTOE_BANK_SELECT_REG, 2); | ||||||
| + optoe->write_max = write_max_orig; | ||||||
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|
||||||
| + } else { | ||||||
| + page = 0; | ||||||
| + ret = optoe_eeprom_write(optoe, client, &page, | ||||||
| + OPTOE_PAGE_SELECT_REG, 1); | ||||||
| + } | ||||||
| if (ret < 0) { | ||||||
| dev_err(&client->dev, | ||||||
| - "Restore page register to 0 failed:%d!\n", ret); | ||||||
| + "Restore bank, page register to (0, 0) failed:%d!\n", ret); | ||||||
|
There was a problem hiding this comment. If this restore fails, the module's bank/page registers remain pointing to the last accessed bank/page (not reset to 0). If the next write is intended to be for page/bank 0 in optoe_eeprom_update_client, it will skip the optoe_eeprom_write and actually be read from the wrong page/bank. ( due to the if page/bank > 0 check) If the restore fails, we shouldn't skip the optoe_eeprom_write |
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| + optoe->page_restore_failed = true; | ||||||
| + | ||||||
| /* error only if nothing has been transferred */ | ||||||
| if (retval == 0) | ||||||
| retval = ret; | ||||||
| @@ -622,8 +724,10 @@ static ssize_t optoe_page_legal(struct optoe_data *optoe, | ||||||
| /* if no pages needed, we're good */ | ||||||
| if ((off + len) <= ONE_ADDR_EEPROM_UNPAGED_SIZE) | ||||||
| return len; | ||||||
| + | ||||||
| + maxlen = one_addr_eeprom_size_with_bank(optoe->bank_size); | ||||||
| /* if offset exceeds possible pages, we're not good */ | ||||||
| - if (off >= ONE_ADDR_EEPROM_SIZE) | ||||||
| + if (off >= maxlen) | ||||||
| return OPTOE_EOF; | ||||||
| /* in between, are pages supported? */ | ||||||
| status = optoe_eeprom_read(optoe, client, ®val, | ||||||
| @@ -665,7 +769,7 @@ static ssize_t optoe_page_legal(struct optoe_data *optoe, | ||||||
| maxlen = ONE_ADDR_EEPROM_UNPAGED_SIZE - off; | ||||||
| } else { | ||||||
| /* Pages supported, trim len to the end of pages */ | ||||||
| - maxlen = ONE_ADDR_EEPROM_SIZE - off; | ||||||
| + maxlen = maxlen - off; | ||||||
| } | ||||||
| len = (len > maxlen) ? maxlen : len; | ||||||
| dev_dbg(&client->dev, | ||||||
| @@ -995,6 +1099,44 @@ static ssize_t set_port_name(struct device *dev, | ||||||
| return count; | ||||||
| } | ||||||
|
|
||||||
| +static ssize_t show_bank_size(struct device *dev, | ||||||
| + struct device_attribute *dattr, char *buf) | ||||||
| +{ | ||||||
| + struct i2c_client *client = to_i2c_client(dev); | ||||||
| + struct optoe_data *optoe = i2c_get_clientdata(client); | ||||||
| + ssize_t count; | ||||||
| + | ||||||
| + mutex_lock(&optoe->lock); | ||||||
| + count = sprintf(buf, "%u\n", optoe->bank_size); | ||||||
| + mutex_unlock(&optoe->lock); | ||||||
| + | ||||||
| + return count; | ||||||
| +} | ||||||
| + | ||||||
| +static ssize_t set_bank_size(struct device *dev, | ||||||
|
Contributor
There was a problem hiding this comment. @ishidawataru do we need this? What is the usecase? I thought the number of banks is already advertised so the optoe driver can read the advertisement and cache the value? Are you considering a case where the module is swapped? |
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| + struct device_attribute *attr, | ||||||
| + const char *buf, size_t count) | ||||||
| +{ | ||||||
| + struct i2c_client *client = to_i2c_client(dev); | ||||||
| + struct optoe_data *optoe = i2c_get_clientdata(client); | ||||||
| + unsigned int bank_size; | ||||||
| + | ||||||
| + // setting bank size is only supported for the CMIS device | ||||||
|
There was a problem hiding this comment. Use C-style comment syntax /* / instead of C++ style //. Kernel code should use C-style comments for inline code comments. The comment should be: / setting bank size is only supported for the CMIS device */
Suggested change
|
||||||
| + if (optoe->dev_class != CMIS_ADDR) { | ||||||
| + return -EINVAL; | ||||||
| + } | ||||||
| + | ||||||
| + if (kstrtouint(buf, 0, &bank_size) != 0 || | ||||||
| + bank_size > OPTOE_MAX_SUPPORTED_BANK_SIZE) | ||||||
| + return -EINVAL; | ||||||
| + | ||||||
| + mutex_lock(&optoe->lock); | ||||||
| + optoe->bank_size = bank_size; | ||||||
| + mutex_unlock(&optoe->lock); | ||||||
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|
||||||
| + | ||||||
| + return count; | ||||||
| +} | ||||||
| + | ||||||
| static DEVICE_ATTR(port_name, 0644, show_port_name, set_port_name); | ||||||
| #endif /* if NOT defined EEPROM_CLASS, the common case */ | ||||||
|
|
||||||
| @@ -1003,6 +1145,7 @@ static DEVICE_ATTR(write_timeout, 0644, show_dev_write_timeout_size, | ||||||
| static DEVICE_ATTR(write_max, 0644, show_dev_write_max_size, | ||||||
| set_dev_write_max_size); | ||||||
| static DEVICE_ATTR(dev_class, 0644, show_dev_class, set_dev_class); | ||||||
| +static DEVICE_ATTR(bank_size, 0644, show_bank_size, set_bank_size); | ||||||
|
|
||||||
| static struct attribute *optoe_attrs[] = { | ||||||
| #ifndef EEPROM_CLASS | ||||||
| @@ -1011,6 +1154,7 @@ static struct attribute *optoe_attrs[] = { | ||||||
| &dev_attr_write_timeout.attr, | ||||||
| &dev_attr_write_max.attr, | ||||||
| &dev_attr_dev_class.attr, | ||||||
| + &dev_attr_bank_size.attr, | ||||||
| NULL, | ||||||
| }; | ||||||
|
|
||||||
| @@ -1027,7 +1171,6 @@ static int optoe_probe(struct i2c_client *client) | ||||||
| const struct i2c_device_id *id; | ||||||
| int num_addresses = 0; | ||||||
| char port_name[MAX_PORT_NAME_LEN]; | ||||||
| - | ||||||
| if (client->addr != 0x50) { | ||||||
| dev_dbg(&client->dev, "probe, bad i2c addr: 0x%x\n", | ||||||
| client->addr); | ||||||
| @@ -1109,7 +1252,7 @@ static int optoe_probe(struct i2c_client *client) | ||||||
| } else if (strcmp(client->name, "optoe3") == 0) { | ||||||
| /* CMIS spec */ | ||||||
| optoe->dev_class = CMIS_ADDR; | ||||||
| - chip.byte_len = ONE_ADDR_EEPROM_SIZE; | ||||||
| + chip.byte_len = one_addr_eeprom_size_with_bank(OPTOE_MAX_SUPPORTED_BANK_SIZE); | ||||||
| num_addresses = 1; | ||||||
| } else { /* those were the only choices */ | ||||||
| err = -EINVAL; | ||||||
| @@ -1121,6 +1264,7 @@ static int optoe_probe(struct i2c_client *client) | ||||||
| optoe->chip = chip; | ||||||
| optoe->num_addresses = num_addresses; | ||||||
| optoe->write_timeout = OPTOE_DEFAULT_WRITE_TIMEOUT; | ||||||
| + optoe->bank_size = OPTOE_DEFAULT_BANK_SIZE; | ||||||
| memcpy(optoe->port_name, port_name, MAX_PORT_NAME_LEN); | ||||||
|
|
||||||
| /* | ||||||
| -- | ||||||
| 2.25.1 | ||||||
|
|
||||||
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It’d be great if you could add a paragraph how to verify/test this to the commit message too.