[dpdk-dev] [PATCH v3 1/3] pci: implement hotplug bus operation

[Gaetan Rivet]

Signed-off-by: Gaetan Rivet <gaetan.ri...@6wind.com>
---
 lib/librte_eal/common/eal_common_pci.c | 67 ++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_pci.c 
b/lib/librte_eal/common/eal_common_pci.c
index b4f8056..6049b49 100644
--- a/lib/librte_eal/common/eal_common_pci.c
+++ b/lib/librte_eal/common/eal_common_pci.c
@@ -47,6 +47,7 @@
 #include <rte_pci.h>
 #include <rte_per_lcore.h>
 #include <rte_memory.h>
+#include <rte_memcpy.h>
 #include <rte_memzone.h>
 #include <rte_eal.h>
 #include <rte_string_fns.h>
@@ -517,12 +518,78 @@ pci_find_device(rte_dev_cmp_t cmp, const void *data)
        return NULL;
 }
 
+static struct rte_device *
+pci_plug(struct rte_devargs *da)
+{
+       struct rte_pci_device *pdev;
+       struct rte_pci_addr addr;
+
+       if (pci_parse(da->name, &addr)) {
+               rte_errno = EFAULT;
+               return NULL;
+       }
+       /*
+        * Update eventual pci device in global list.
+        * Insert it if none was found.
+        */
+       if (pci_update_device(&addr) < 0) {
+               rte_errno = EIO;
+               return NULL;
+       }
+       /* Find the current device holding this address in the bus. */
+       FOREACH_DEVICE_ON_PCIBUS(pdev) {
+               if (rte_eal_compare_pci_addr(&pdev->addr, &addr))
+                       continue;
+               /* Update eventual devargs. */
+               pdev->device.devargs = rte_eal_devargs_clone(da);
+               if (pdev->device.devargs == NULL) {
+                       rte_errno = ENOMEM;
+                       return NULL;
+               }
+               break;
+       }
+       if (rte_pci_probe_one(&addr)) {
+               rte_errno = ENODEV;
+               return NULL;
+       }
+       /* Get back new device name. */
+       if (pdev->device.devargs &&
+           da != pdev->device.devargs)
+               snprintf(da->name, sizeof(da->name), "%s",
+                        pdev->device.devargs->name);
+       return &pdev->device;
+}
+
+static int
+pci_unplug(struct rte_device *dev)
+{
+       struct rte_pci_addr addr;
+
+       if (dev == NULL) {
+               rte_errno = EINVAL;
+               return -1;
+       }
+       if (pci_parse(dev->name, &addr)) {
+               rte_errno = EFAULT;
+               return -1;
+       }
+       if (rte_pci_detach(&addr)) {
+               rte_errno = ENODEV;
+               return -1;
+       }
+       if (dev->devargs)
+               rte_eal_devargs_rmv(dev->devargs);
+       return 0;
+}
+
 struct rte_pci_bus rte_pci_bus = {
        .bus = {
                .scan = rte_pci_scan,
                .probe = rte_pci_probe,
                .find_device = pci_find_device,
                .parse = pci_parse,
+               .plug = pci_plug,
+               .unplug = pci_unplug,
        },
        .device_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.device_list),
        .driver_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.driver_list),
-- 
2.1.4