diff mbox

[dpdk-dev,v3] pci: save list of detached devices, and re-probe during driver unload

Message ID 84B1AA3E-21E4-4A41-ADEE-B37E27147243@gmail.com (mailing list archive)
State Superseded, archived
Headers

Commit Message

Raz Amir March 9, 2015, 8:07 a.m. UTC 
Hi, gentle reminder about this patch...

On Mar 4, 2015, at 1:15 PM, Raz Amir <razamir22@gmail.com> wrote:

Added code that saves the pointers to the detached devices, during
driver loading, and during driver unloading, go over the list,
and re-attach them by calling device_probe_and_attach
on each device.

Signed-off-by: Raz Amir <razamir22@gmail.com>
---
lib/librte_eal/bsdapp/nic_uio/nic_uio.c | 32 ++++++++++++++++++++++++++++----
1 file changed, 28 insertions(+), 4 deletions(-)

Comments

Bruce Richardson March 9, 2015, 10:27 a.m. UTC | #1 
On Mon, Mar 09, 2015 at 10:07:29AM +0200, Raz Amir wrote:
> Hi, gentle reminder about this patch...
> 
> On Mar 4, 2015, at 1:15 PM, Raz Amir <razamir22@gmail.com> wrote:
> 
> Added code that saves the pointers to the detached devices, during
> driver loading, and during driver unloading, go over the list,
> and re-attach them by calling device_probe_and_attach
> on each device.
> 
> Signed-off-by: Raz Amir <razamir22@gmail.com>
> ---
> lib/librte_eal/bsdapp/nic_uio/nic_uio.c | 32 ++++++++++++++++++++++++++++----
> 1 file changed, 28 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> index 5ae8560..78e4dea 100644
> --- a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> +++ b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> @@ -55,6 +55,9 @@ __FBSDID("$FreeBSD$");
> 
> #define MAX_BARS (PCIR_MAX_BAR_0 + 1)
> 
> +#define MAX_DETACHED_DEVICES    128
> +static device_t detached_devices[MAX_DETACHED_DEVICES] = {};
> +static int num_detached = 0;
> 
> struct nic_uio_softc {
>    device_t        dev_t;
> @@ -289,16 +292,37 @@ nic_uio_load(void)
> 
>        dev = pci_find_bsf(bus, device, function);
>        if (dev != NULL)
> -            for (i = 0; i < NUM_DEVICES; i++)
> -                if (pci_get_vendor(dev) == devices[i].vend &&
> -                        pci_get_device(dev) == devices[i].dev)
> -                            device_detach(dev);
> +            continue;
Since we have changed the body to be a continue statement, I think the condition
above needs to be flipped.

/Bruce
Raz Amir March 10, 2015, 8:15 a.m. UTC | #2 
Sorry for that. Will send the new patch soon

-----Original Message-----
From: Bruce Richardson [mailto:bruce.richardson@intel.com] 
Sent: 09 March 2015 12:28
To: Raz Amir
Cc: dev@dpdk.org
Subject: Re: [PATCH v3] pci: save list of detached devices, and re-probe
during driver unload

On Mon, Mar 09, 2015 at 10:07:29AM +0200, Raz Amir wrote:
> Hi, gentle reminder about this patch...
> 
> On Mar 4, 2015, at 1:15 PM, Raz Amir <razamir22@gmail.com> wrote:
> 
> Added code that saves the pointers to the detached devices, during 
> driver loading, and during driver unloading, go over the list, and 
> re-attach them by calling device_probe_and_attach on each device.
> 
> Signed-off-by: Raz Amir <razamir22@gmail.com>
> ---
> lib/librte_eal/bsdapp/nic_uio/nic_uio.c | 32 
> ++++++++++++++++++++++++++++----
> 1 file changed, 28 insertions(+), 4 deletions(-)
> 
> diff --git a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c 
> b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> index 5ae8560..78e4dea 100644
> --- a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> +++ b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
> @@ -55,6 +55,9 @@ __FBSDID("$FreeBSD$");
> 
> #define MAX_BARS (PCIR_MAX_BAR_0 + 1)
> 
> +#define MAX_DETACHED_DEVICES    128
> +static device_t detached_devices[MAX_DETACHED_DEVICES] = {}; static 
> +int num_detached = 0;
> 
> struct nic_uio_softc {
>    device_t        dev_t;
> @@ -289,16 +292,37 @@ nic_uio_load(void)
> 
>        dev = pci_find_bsf(bus, device, function);
>        if (dev != NULL)
> -            for (i = 0; i < NUM_DEVICES; i++)
> -                if (pci_get_vendor(dev) == devices[i].vend &&
> -                        pci_get_device(dev) == devices[i].dev)
> -                            device_detach(dev);
> +            continue;
Since we have changed the body to be a continue statement, I think the
condition above needs to be flipped.

/Bruce
diff mbox

Patch

diff --git a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
index 5ae8560..78e4dea 100644
--- a/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
+++ b/lib/librte_eal/bsdapp/nic_uio/nic_uio.c
@@ -55,6 +55,9 @@  __FBSDID("$FreeBSD$");

#define MAX_BARS (PCIR_MAX_BAR_0 + 1)

+#define MAX_DETACHED_DEVICES    128
+static device_t detached_devices[MAX_DETACHED_DEVICES] = {};
+static int num_detached = 0;

struct nic_uio_softc {
   device_t        dev_t;
@@ -289,16 +292,37 @@  nic_uio_load(void)

       dev = pci_find_bsf(bus, device, function);
       if (dev != NULL)
-            for (i = 0; i < NUM_DEVICES; i++)
-                if (pci_get_vendor(dev) == devices[i].vend &&
-                        pci_get_device(dev) == devices[i].dev)
-                            device_detach(dev);
+            continue;
+        
+        for (i = 0; i < NUM_DEVICES; i++)
+            if (pci_get_vendor(dev) == devices[i].vend &&
+                    pci_get_device(dev) == devices[i].dev) {
+                        if (num_detached < MAX_DETACHED_DEVICES) {
+                            printf("nic_uio_load: detaching and storing dev=%p\n", dev);
+                            detached_devices[num_detached++] = dev;
+                        }
+                        else
+                            printf("nic_uio_load: reached MAX_DETACHED_DEVICES=%d. dev=%p won't be reattached\n",
+                                MAX_DETACHED_DEVICES, dev);
+                        device_detach(dev);
+            }
   }
}

static void
nic_uio_unload(void)
{
+    int i;
+    printf("nic_uio_unload: entered ... \n");
+
+    for (i = 0; i < num_detached; i++) {
+        printf("nic_uio_unload: calling to device_probe_and_attach for dev=%p...\n",
+            detached_devices[i]);
+        device_probe_and_attach(detached_devices[i]);
+        printf("nic_uio_unload: done.\n");
+    }
+
+    printf("nic_uio_unload: leaving ... \n");
}

static int