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From: Shreyansh Jain <shreyansh.jain@nxp.com>
To: <dev@dpdk.org>
CC: <viktorin@rehivetech.com>, <thomas.monjalon@6wind.com>, David Marchand
<david.marchand@6wind.com>
Date: Mon, 1 Aug 2016 16:15:28 +0530
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Subject: [dpdk-dev] [PATCH v7 13/17] pci: add a helper to update a device
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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@6wind.com>
Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>
---
lib/librte_eal/bsdapp/eal/eal_pci.c | 49 +++++++++++++++++++++++++++++++++++
lib/librte_eal/common/eal_private.h | 13 ++++++++++
lib/librte_eal/linuxapp/eal/eal_pci.c | 13 ++++++++++
3 files changed, 75 insertions(+)
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_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/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index f0215ee..62da4d4 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,
+ pci_get_sysfs_path(), addr->domain, addr->bus, addr->devid,
+ addr->function);
+
+ return pci_scan_one(filename, addr->domain, addr->bus, addr->devid,
+ addr->function);
+}
+
/*
* split up a pci address into its constituent parts.
*/
--
2.7.4