Messages in this thread | | | Date | Fri, 05 Dec 2003 15:03:36 -0500 | From | Jeff Garzik <> | Subject | Re: [PATCH 2.6.0-test11] Net device error logging |
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Jim Keniston wrote: > The enclosed patch implements the netdev_* error-logging macros for > network drivers. These macros have been discussed at length on the > linux-kernel and linux-netdev lists. With the v2.6.0-test6 version of > these macros, we addressed all the issues that reviewers had raised. > This is just an update for v2.6.0-test11. > > As previously discussed, these macros are in demand now (e.g., for > the e1000 driver) and have essentially no impact on drivers that > don't use them. > > RECAP (from previous posts): > Calls to the netdev_* macros (netdev_printk and wrappers such as > netdev_err) are intended to replace calls to printk in network device > drivers. These macros have the following characteristics: > - Same format + args as the corresponding printk call. > - Approximately the same amount of text as the corresponding printk call. > - The first arg is a pointer to the net_device struct. > - The second arg, which is a NETIF_MSG_* message level, can be used to > implement verbosity control. > - Standard message prefixes: verbose (interface name, driver name, bus ID) > during probe, or just the interface name once the device is registered. > - The current implementation just calls printk. However, the netdev_* > interface (and availability of the net_device pointer) opens the door > for logging additional information (via printk, via evlog/netlink, etc.) > as desired, with no change to driver code. > > Examples: > netdev_err(netdev, RX_ERR, "No mem: dropped packet\n"); > logs a message such as the following if the NETIF_MSG_RX_ERR bit is set > in netdev->msg_enable. > eth2: No mem: dropped packet > > netdev_fatal(netdev, PROBE, "The EEPROM Checksum Is Not Valid\n"); > or > netdev_err(netdev, ALL, "The EEPROM Checksum Is Not Valid\n"); > unconditionally logs a message such as: > eth%d (e1000 0000:00:03.0): The EEPROM Checksum Is Not Valid > The message's prefix includes the driver name and bus ID because the > message is logged at probe time, before netdev is registered. > > SAMPLE DRIVERS > As examples of how the netdev_* macros could be used, patches for the > v2.6.0-test11 e100, e1000, and tg3 drivers are available on request. > > LINUX v2.4 SUPPORT > Since there is no v2.6-style struct device underlying the net_device, > a v2.4.23-compatible version of netdev_printk would always log the > interface name as the message prefix: > > #define netdev_printk(sevlevel, netdev, msglevel, format, arg...) \ > do { \ > if (NETIF_MSG_##msglevel == NETIF_MSG_ALL \ > || (netdev->msg_enable & NETIF_MSG_##msglevel)) { \ > printk(sevlevel "%s: " format , netdev->name , ## arg); \ > } \ > } while (0)
I discussed this a bit with David. My personal feelings are that I prefer just leaving all the printk's as they are. But Linus and GregKH have been accepting patches into other parts of the tree like this one, and logging additional already-computer-parsed information is probably not a bad thing long-term, so perhaps I've been being a bit of a Luddite on this issue.
It's definitely too late for 2.6.0-testX mainline merging, until Andrew (2.6) and Linus (2.7) re-open their respective trees, but a good first step would be for me to merge this into the net-drivers-2.5-exp queue.
Jeff
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