[dpdk-dev] [PATCH v6 13/17] pci: add a helper to update a device
Jan Viktorin
viktorin at rehivetech.com
Thu Jul 14 19:01:14 CEST 2016
On Tue, 12 Jul 2016 11:31:18 +0530
Shreyansh Jain <shreyansh.jain at nxp.com> wrote:
> This helper updates a pci device object with latest information it can
> find.
> It will be used mainly for hotplug code.
>
> Signed-off-by: David Marchand <david.marchand at 6wind.com>
> Signed-off-by: Shreyansh Jain <shreyansh.jain at nxp.com>
> ---
> lib/librte_eal/bsdapp/eal/eal_pci.c | 49 +++++++++++++++++++++++++++++++++
> lib/librte_eal/common/eal_common_pci.c | 2 --
> lib/librte_eal/common/eal_private.h | 13 +++++++++
> lib/librte_eal/common/include/rte_pci.h | 3 ++
> lib/librte_eal/linuxapp/eal/eal_pci.c | 13 +++++++++
> 5 files changed, 78 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_eal/bsdapp/eal/eal_pci.c b/lib/librte_eal/bsdapp/eal/eal_pci.c
> index a73cbb0..1d91c78 100644
> --- a/lib/librte_eal/bsdapp/eal/eal_pci.c
> +++ b/lib/librte_eal/bsdapp/eal/eal_pci.c
> @@ -406,6 +406,55 @@ error:
> return -1;
> }
>
> +int
> +pci_update_device(const struct rte_pci_addr *addr)
> +{
> + int fd;
> + struct pci_conf matches[2];
> + struct pci_match_conf match = {
> + .pc_sel = {
> + .pc_domain = addr->domain,
> + .pc_bus = addr->bus,
> + .pc_dev = addr->devid,
> + .pc_func = addr->function,
> + },
> + };
> + struct pci_conf_io conf_io = {
> + .pat_buf_len = 0,
> + .num_patterns = 1,
> + .patterns = &match,
> + .match_buf_len = sizeof(matches),
> + .matches = &matches[0],
> + };
> +
> + fd = open("/dev/pci", O_RDONLY);
> + if (fd < 0) {
> + RTE_LOG(ERR, EAL, "%s(): error opening /dev/pci\n", __func__);
> + goto error;
> + }
> +
> + if (ioctl(fd, PCIOCGETCONF, &conf_io) < 0) {
> + RTE_LOG(ERR, EAL, "%s(): error with ioctl on /dev/pci: %s\n",
> + __func__, strerror(errno));
> + goto error;
> + }
> +
> + if (conf_io.num_matches != 1)
> + goto error;
> +
> + if (pci_scan_one(fd, &matches[0]) < 0)
> + goto error;
> +
> + close(fd);
> +
> + return 0;
> +
> +error:
> + if (fd >= 0)
> + close(fd);
> + return -1;
> +}
> +
> /* Read PCI config space. */
> int rte_eal_pci_read_config(const struct rte_pci_device *dev,
> void *buf, size_t len, off_t offset)
> diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
> index 6a0f6ac..58f0c74 100644
> --- a/lib/librte_eal/common/eal_common_pci.c
> +++ b/lib/librte_eal/common/eal_common_pci.c
> @@ -87,8 +87,6 @@ struct pci_driver_list pci_driver_list =
> struct pci_device_list pci_device_list =
> TAILQ_HEAD_INITIALIZER(pci_device_list);
>
> -#define SYSFS_PCI_DEVICES "/sys/bus/pci/devices"
> -
Is this delete correct? The SYSFS_PCI_DEVICES was moved here from
rte_pci.h. A relict of some rebase?
> const char *pci_get_sysfs_path(void)
> {
> const char *path = NULL;
> diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
> index 06a68f6..b8ff9c5 100644
> --- a/lib/librte_eal/common/eal_private.h
> +++ b/lib/librte_eal/common/eal_private.h
> @@ -152,6 +152,19 @@ struct rte_pci_driver;
> struct rte_pci_device;
>
> /**
> + * Update a pci device object by asking the kernel for the latest information.
> + *
> + * This function is private to EAL.
> + *
> + * @param addr
> + * The PCI Bus-Device-Function address to look for
> + * @return
> + * - 0 on success.
> + * - negative on error.
> + */
> +int pci_update_device(const struct rte_pci_addr *addr);
> +
> +/**
> * Unbind kernel driver for this device
> *
> * This function is private to EAL.
> diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
> index 06508fa..5c2062c 100644
> --- a/lib/librte_eal/common/include/rte_pci.h
> +++ b/lib/librte_eal/common/include/rte_pci.h
> @@ -107,6 +107,9 @@ const char *pci_get_sysfs_path(void);
> /** Nb. of values in PCI resource format. */
> #define PCI_RESOURCE_FMT_NVAL 3
>
> +/** Default sysfs path for PCI device search. */
> +#define SYSFS_PCI_DEVICES "/sys/bus/pci/devices"
> +
Why adding SYSFS_PCI_DEVICES here? The pci_get_sysfs_path is used for
this purpose. Again, a rebase issue?
> /**
> * A structure describing a PCI resource.
> */
> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
> index f0215ee..8f3ef20 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
> @@ -417,6 +417,19 @@ pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
> return 0;
> }
>
> +int
> +pci_update_device(const struct rte_pci_addr *addr)
> +{
> + char filename[PATH_MAX];
> +
> + snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT,
> + SYSFS_PCI_DEVICES, addr->domain, addr->bus, addr->devid,
Use pci_get_sysfs_path here.
> + addr->function);
> +
> + return pci_scan_one(filename, addr->domain, addr->bus, addr->devid,
> + addr->function);
> +}
> +
> /*
> * split up a pci address into its constituent parts.
> */
--
Jan Viktorin E-mail: Viktorin at RehiveTech.com
System Architect Web: www.RehiveTech.com
RehiveTech
Brno, Czech Republic
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