diff options
| author | David S. Miller <davem@davemloft.net> | 2023-04-09 16:01:28 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-04-09 16:01:28 +0100 |
| commit | 9a06fe08ae938bc2c2fb96e36ebcdb7b1a5133c4 (patch) | |
| tree | ab9b924053b727145b72e3d46401acee71c16496 | |
| parent | 5cc33f139e11b893ff6dc60d8a0ae865a65521ac (diff) | |
| parent | bef227c1537cb8005311c0842bc5449e8c7a5973 (diff) | |
| download | nvme-9a06fe08ae938bc2c2fb96e36ebcdb7b1a5133c4.tar.gz | |
Merge branch 'sfp-eeprom'
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>
| -rw-r--r-- | drivers/net/phy/sfp.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c index 8af10bb53e57b6..bf345032d450c9 100644 --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -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); |