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modules/mqnic: sfp module eeprom i2c address adjustment for full access

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* the optical diagnostics data is provided by the SFP modules
   using another I2C address, which must be set via the I2C client
This commit is contained in:
Ulrich Langenbach 2022-08-11 11:35:22 +02:00 committed by Alex Forencich
parent 6bd8ae031f
commit b1f14659d9
1 changed files with 18 additions and 1 deletions
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19
modules/mqnic/mqnic_ethtool.c
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@ -327,6 +327,8 @@ static int mqnic_query_module_eeprom_by_page(struct net_device *ndev,
{ {
int module_id; int module_id;
u8 d; u8 d;
int ret;
unsigned short orig_i2c_addr;
module_id = mqnic_query_module_id(ndev); module_id = mqnic_query_module_id(ndev);
@ -374,8 +376,23 @@ static int mqnic_query_module_eeprom_by_page(struct net_device *ndev,
return -EINVAL; return -EINVAL;
} }
// set i2c address of the mod_i2c_client
// This code section should not be called concurrently since the IOCTL
// handler for ethtool operations is called under the RTNL lock.
// In addition the i2c_client is used only within code inside this lock.
if (!priv->mod_i2c_client)
return -EINVAL;
orig_i2c_addr = priv->mod_i2c_client->addr;
priv->mod_i2c_client->addr = i2c_addr;
// read data // read data
return mqnic_read_module_eeprom(ndev, offset, len, data); ret = mqnic_read_module_eeprom(ndev, offset, len, data);
// reset i2c addr
priv->mod_i2c_client->addr = orig_i2c_addr;
return ret;
} }
static int mqnic_query_module_eeprom(struct net_device *ndev, static int mqnic_query_module_eeprom(struct net_device *ndev,