CODEWITHSUNDEEP
clinuxlinux-kernelkernelnetwork-driver
user786
user786

Reputation: 4374

What meant by link change in network driver does this means TX to RX so there is link change or is it speed like data transfer phydev->speed or what

Why drivers raise PHY interrupt. Is it this the job of Kernel so why driver part of kernel raising PHY interrupt like

   u32 status = //read registers
   if (status & LinkChg_Status)
    phy_mac_interrupt(tp->phydev);

above code is in request_irq(pci_irq_vector(pdev, 0), rtl8169_interrupt, interrupt context

on kernel.org it says

Sometime during startup, the network driver needs to establish a connection 

betweenthe PHY device, and the network device. At this time, the PHY's bus and   
drivers need to all have been loaded, so it is ready for the connection. At this 
point, there are several ways to connect to the PHY:

    The PAL handles everything, and only calls the network driver when the link state
    changes, so it can react.

in above statement what is link state changes might be? does this mean at one state its TX and at link change to RX?

Upvotes: 0

Views: 337

Answers (1)

user786
user786

Reputation: 4374

from The datasheet it says its

Packet Underrun/Link Change: This bit is set to 1 when CAPR is written but the Rx buffer is empty, or when link status is changed.

Upvotes: 0

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