On Wed, 2012-09-19 at 08:53 -0700, Greg Rose wrote: > On Wed, 19 Sep 2012 14:07:19 +0300 > Yuval Mintz <yuvalmin@xxxxxxxxxxxx> wrote: [...] > > We've encountered a problem though - all drivers currently supporting > > SRIOV do so with the usage of a module param: e.g., 'max_vfs' for > > ixgbe, 'num_vfs' for benet, etc. > > The SRIOV feature is disabled by default on all the drivers; it can > > only be enabled via usage of the module param. > > > > We don't want the lack of SRIOV module param in the bnx2x driver to be > > the bottle-neck when we'll submit the SRIOV feature upstream, and we > > also don't want to enable SRIOV by default (following the same logic > > of other drivers; most users don't use SRIOV and it would strain their > > resources). > > > > As we see it, there are several possible ways of solving the issue: > > 1. Use some network-tool (e.g., ethtool). > > 2. Implement a standard sysfs interface for PCIe devices, as SRIOV is > > not solely network-related (this should be done via the PCI linux > > tree). There is another interim option, which is to put this setting somewhere in NVRAM on the device. This solves the one-size-for-all-devices problem, though obviously not the inconsistent-interface problem. > I was not able to attend the Linux conference held at the end of August > myself but coworkers of mine here at Intel informed that method 2 here > seems to be the preferred approach. Perhaps some folks who attended > the the conference can chime in with more specifics. There really wasn't much more specific discussion. Bjorn's summary of the mini-summit <http://lwn.net/Articles/514113/> says: > SR-IOV Management > > Currently drivers implement module parameters like "max_vfs". This means > all devices claimed by the driver get the same number of VFs, and you can't > change anything without unloading and reloading the driver. > > Consensus that we should try to implement a knob for this in sysfs so it > can be generic (not in each driver) and set individually for each device. I don't think any implementation has been posted to the linux-pci list yet...? Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
