[dpdk-dev] [PATCH v7 5/6] bus: add helper to find a bus from a device name

[Thomas Monjalon]

05/07/2017 15:45, Gaëtan Rivet:
> On Wed, Jul 05, 2017 at 07:05:40PM +0530, Shreyansh Jain wrote:
> > >+struct rte_bus *
> > >+rte_bus_find_by_device_name(const char *str)
> > >+{
> > >+	char name[32];
> > 
> > It is possible to use a constant here? Basically, I am not sure why '32' has
> > been chosen - or maybe, it might remind a reader in future the reason for
> > this value.
> > 
> > Just to clarify: is there any documented limit on bus name? Until this
> > point, the name (and length) of bus was responsibility of bus driver
> > implementation. eal_common_bus.c doesn't codify any limit - so, this may
> > have to be advertised, even if just within the code.
> 
> I agree that this is not clear. First thing however: this is a limit on
> the device name length, not bus.
> 
> This problem is fixed in [1], as a single common device name location is
> defined. The problem is that it is in another patchset (even if both are
> closely linked and were only separated to ease integration).
> 
> This limit was currently taken from the arbitrary limit of device in
> name in the original rte_devargs for virtual devices. I think it could
> be exported as a define by rte_dev.h, used there and reused in [1] to
> define the new rte_devargs structure.

Please check this patch which was integrated yesterday:
	http://dpdk.org/commit/48d8675c9cf
Now you can use RTE_DEV_NAME_MAX_LEN instead of hardcoded 32.