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Merge branch 'sfp-eeprom'

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Ivan Bornyakov says:

====================
net: fix EEPROM read of absent SFP module

The patchset is to improve EEPROM read requests when SFP module is
absent.

ChangeLog:
v1:
https://lore.kernel.org/netdev/20230405153900.747-1-i.bornyakov@metrotek.ru/
v2:
  * reword commit message of "net: sfp: initialize sfp->i2c_block_size
    at sfp allocation"
  * add second patch to eliminate excessive I2C transfers in
    sfp_module_eeprom() and sfp_module_eeprom_by_page()
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2023-04-09 16:01:28 +01:00
commit 9a06fe08ae
1 changed files with 14 additions and 5 deletions
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19
drivers/net/phy/sfp.c
View File

@ -210,6 +210,12 @@ static const enum gpiod_flags gpio_flags[] = {
#define SFP_PHY_ADDR 22
#define SFP_PHY_ADDR_ROLLBALL 17
/* SFP_EEPROM_BLOCK_SIZE is the size of data chunk to read the EEPROM
* at a time. Some SFP modules and also some Linux I2C drivers do not like
* reads longer than 16 bytes.
*/
#define SFP_EEPROM_BLOCK_SIZE 16
struct sff_data {
unsigned int gpios;
bool (*module_supported)(const struct sfp_eeprom_id *id);
@ -1929,11 +1935,7 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
u8 check;
int ret;
/* Some SFP modules and also some Linux I2C drivers do not like reads
* longer than 16 bytes, so read the EEPROM in chunks of 16 bytes at
* a time.
*/
sfp->i2c_block_size = 16;
sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE;
ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
if (ret < 0) {
@ -2485,6 +2487,9 @@ static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
unsigned int first, last, len;
int ret;
if (!(sfp->state & SFP_F_PRESENT))
return -ENODEV;
if (ee->len == 0)
return -EINVAL;
@ -2517,6 +2522,9 @@ static int sfp_module_eeprom_by_page(struct sfp *sfp,
const struct ethtool_module_eeprom *page,
struct netlink_ext_ack *extack)
{
if (!(sfp->state & SFP_F_PRESENT))
return -ENODEV;
if (page->bank) {
NL_SET_ERR_MSG(extack, "Banks not supported");
return -EOPNOTSUPP;
@ -2621,6 +2629,7 @@ static struct sfp *sfp_alloc(struct device *dev)
return ERR_PTR(-ENOMEM);
sfp->dev = dev;
sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE;
mutex_init(&sfp->sm_mutex);
mutex_init(&sfp->st_mutex);