On Wed, 5 Feb 2025 16:36:11 +0000
Shani Peretz <shper...@nvidia.com> wrote:
> > -----Original Message-----
> > From: Stephen Hemminger <step...@networkplumber.org>
> > Sent: Wednesday, 29 January 2025 18:25
> > To: Shani Peretz <shper...@nvidia.com>
> > Cc: dev@dpdk.org; NBU-Contact-Thomas Monjalon (EXTERNAL)
> > <tho...@monjalon.net>; Tyler Retzlaff <roret...@linux.microsoft.com>; Parav
> > Pandit <pa...@nvidia.com>; Xueming Li <xuemi...@nvidia.com>; Nipun Gupta
> > <nipun.gu...@amd.com>; Nikhil Agarwal <nikhil.agar...@amd.com>; Hemant
> > Agrawal <hemant.agra...@nxp.com>; Sachin Saxena
> > <sachin.sax...@nxp.com>; Rosen Xu <rosen...@intel.com>; Chenbo Xia
> > <chen...@nvidia.com>; Tomasz Duszynski <tduszyn...@marvell.com>;
> > Chengwen Feng <fengcheng...@huawei.com>; NBU-Contact-longli
> > (EXTERNAL) <lon...@microsoft.com>; Wei Hu <w...@microsoft.com>; Bruce
> > Richardson <bruce.richard...@intel.com>; Kevin Laatz
> > <kevin.la...@intel.com>; Jan Blunck <jblu...@infradead.org>
> > Subject: Re: [PATCH v4] bus: fix inconsistent representation of PCI numbers
> >
> > External email: Use caution opening links or attachments
> >
> >
> > On Wed, 29 Jan 2025 10:54:16 +0200
> > Shani Peretz <shper...@nvidia.com> wrote:
> >
> > > +create_pci_dev(const char *name)
> > > +{
> > > + int port_id;
> > > + uint8_t slave_mac1[] = {0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00 };
> > > + struct rte_ether_addr *mac_addr = (struct rte_ether_addr
> > > +*)slave_mac1;
> >
> > Use different initializer and you can avoid the need for cast here.
> >
> >
> > >
> > > +/**
> > > + * General device name comparison. Will compare by using the specific
> > > +bus
> > > + * compare function or by comparing the names directly.
> > > + *
> > > + * @param dev
> > > + * Device handle.
> > > + * @param name
> > > + * Name to compare against.
> > > + * @return
> > > + * 0 if the device matches the name. Nonzero otherwise.
> > > + */
> > > +__rte_internal
> > > +int rte_cmp_dev_name(const struct rte_device *dev, const void *name);
> >
> > It would make more sense to me if name was a character not void pointer.
> >
> > The design might be clearer if bus address was more of an typedef with a
> > pointer and size together. Treat it more like an object.
>
>
> Okay so just to understand,
> this is the struct I am adding:
>
> struct rte_bus_address {
> const void *addr;
> size_t size;
> };
>
> This is how I pass it to find_device:
>
> struct rte_bus_address dev_addr = {
> .addr = da->name,
> .size = RTE_DEV_NAME_MAX_LEN
> };
> dev = da->bus->find_device(NULL, rte_cmp_dev_name, &dev_addr);
>
> And this is how I use it in rte_cmp_dev_name:
>
> rte_cmp_dev_name(const struct rte_device *dev1, const void *addr)
> {
> const struct rte_bus_address *dev2_addr = addr;
> …
> }
>
> Is that what you meant?
> Also, I'm not sure if the size is really needed, because we check the size of
> the parsed name, which may be different than the size of the original name
>
It would be best to pass rte_bus_address to rte_cmp_dev_name rather than having
implied cast.
Not sure if that is possible without breaking API though.
