From: "Zhang, Qi Z" <qi.z.zhang@intel.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>,
"thomas@monjalon.net" <thomas@monjalon.net>
Cc: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
"Richardson, Bruce" <bruce.richardson@intel.com>,
"Yigit, Ferruh" <ferruh.yigit@intel.com>,
"Shelton, Benjamin H" <benjamin.h.shelton@intel.com>,
"Vangati, Narender" <narender.vangati@intel.com>,
"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-stable] [PATCH v13 02/19] bus/pci: fix PCI address compare
Date: Thu, 12 Jul 2018 11:53:45 +0000 [thread overview]
Message-ID: <039ED4275CED7440929022BC67E7061153259778@SHSMSX103.ccr.corp.intel.com> (raw)
In-Reply-To: <20058c30-7587-7c23-d783-b7a8153592b8@intel.com>
> -----Original Message-----
> From: Burakov, Anatoly
> Sent: Thursday, July 12, 2018 5:25 PM
> To: Zhang, Qi Z <qi.z.zhang@intel.com>; thomas@monjalon.net
> Cc: Ananyev, Konstantin <konstantin.ananyev@intel.com>; dev@dpdk.org;
> Richardson, Bruce <bruce.richardson@intel.com>; Yigit, Ferruh
> <ferruh.yigit@intel.com>; Shelton, Benjamin H
> <benjamin.h.shelton@intel.com>; Vangati, Narender
> <narender.vangati@intel.com>; stable@dpdk.org
> Subject: Re: [PATCH v13 02/19] bus/pci: fix PCI address compare
>
> On 12-Jul-18 2:14 AM, Qi Zhang wrote:
> > When use memcmp to compare two PCI address, sizeof(struct
> > rte_pci_addr) is 4 bytes aligned, and it is 8. While only 7 byte of
> > struct rte_pci_addr is valid. So compare the 8th byte will cause the
> > unexpected result, which happens when repeatedly attach/detach a device.
> >
> > Fixes: c752998b5e2e ("pci: introduce library and driver")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
> > ---
> > drivers/bus/pci/linux/pci_vfio.c | 13 ++++++++++++-
> > 1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/bus/pci/linux/pci_vfio.c
> > b/drivers/bus/pci/linux/pci_vfio.c
> > index aeeaa9ed8..dd25c3542 100644
> > --- a/drivers/bus/pci/linux/pci_vfio.c
> > +++ b/drivers/bus/pci/linux/pci_vfio.c
> > @@ -43,6 +43,17 @@ static struct rte_tailq_elem rte_vfio_tailq = {
> > };
> > EAL_REGISTER_TAILQ(rte_vfio_tailq)
> >
> > +/* Compair two pci address */
> > +static int pci_addr_cmp(struct rte_pci_addr *addr1, struct
> > +rte_pci_addr *addr2) {
> > + if (addr1->domain == addr2->domain &&
> > + addr1->bus == addr2->bus &&
> > + addr1->devid == addr2->devid &&
> > + addr1->function == addr2->function)
> > + return 0;
> > + return 1;
> > +}
>
> Generally, change looks OK to me, but I think we already have this function in
> PCI library - rte_pci_addr_cmp(). Is there a specific reason to reimplement it
> here?
NO, and rte_pci_addr_cmp is what I want :), thanks!
>
> > +
> > int
> > pci_vfio_read_config(const struct rte_intr_handle *intr_handle,
> > void *buf, size_t len, off_t offs) @@ -642,7 +653,7 @@
> > pci_vfio_unmap_resource(struct rte_pci_device *dev)
> > vfio_res_list = RTE_TAILQ_CAST(rte_vfio_tailq.head,
> mapped_pci_res_list);
> > /* Get vfio_res */
> > TAILQ_FOREACH(vfio_res, vfio_res_list, next) {
> > - if (memcmp(&vfio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
> > + if (pci_addr_cmp(&vfio_res->pci_addr, &dev->addr))
> > continue;
> > break;
> > }
> >
>
>
> --
> Thanks,
> Anatoly
prev parent reply other threads:[~2018-07-12 11:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180607123849.14439-1-qi.z.zhang@intel.com>
[not found] ` <20180706141826.204044-1-qi.z.zhang@intel.com>
2018-07-06 14:18 ` [dpdk-stable] [PATCH v9 " Qi Zhang
[not found] ` <20180709033706.27858-1-qi.z.zhang@intel.com>
2018-07-09 3:36 ` [dpdk-stable] [PATCH v10 " Qi Zhang
[not found] ` <20180711030917.181098-1-qi.z.zhang@intel.com>
2018-07-11 3:09 ` [dpdk-stable] [PATCH v11 " Qi Zhang
[not found] ` <20180711134808.254054-1-qi.z.zhang@intel.com>
2018-07-11 13:47 ` [dpdk-stable] [PATCH v12 " Qi Zhang
[not found] ` <20180712011514.45006-1-qi.z.zhang@intel.com>
2018-07-12 1:14 ` [dpdk-stable] [PATCH v13 " Qi Zhang
2018-07-12 9:24 ` Burakov, Anatoly
2018-07-12 9:32 ` [dpdk-stable] [dpdk-dev] " Gaëtan Rivet
2018-07-12 11:57 ` Zhang, Qi Z
2018-07-12 11:53 ` Zhang, Qi Z [this message]
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