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Lab 6: Network Driver

Exercise & Question Answers

Q1: How did you structure your transmit implementation? In particular, what do you do if the transmit ring is full?

A1: If the transmit ring is full, simply report this to user by returning -E_TX_FULL. User programs (e.g. the output environment) retry if they wish.

Q2: How did you structure your receive implementation? In particular, what do you do if the receive queue is empty and a user environment requests the next incoming packet?

A2: If the receive queue is empty, simply report this to user by returning -E_RX_EMPTY. User programs (e.g. the input environment) retry if they wish.

Q3: What does the web page served by JOS's web server say?

A3: "This file came from JOS. Cheesy web page!"

Q4: How long approximately did it take you to do this lab?

A4: About 20 hours.

Challenge

I choose to implement the challenge to load the E1000's MAC address out of the EEPROM.

  • We load E1000's MAC address through MMIO and modify the initialization function e1000_attach() to use the dynamically loaded MAC address instead of the hard-coded one.
  • Then we add a system call sys_net_get_mac() to allow user programs to retrieve the MAC address.
  • Finally we modify net/lwip/jos/jif/jif.c to call sys_net_get_mac() to dynamically load the MAC address.