uio_hv_generic: create send and receive buffers

Map in receive and send buffers for networking in UIO device.
These buffers are special and need to be setup by kernel
API's; userspace can not do it.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/driver-api/uio-howto.rst b/Documentation/driver-api/uio-howto.rst
index 968f4c2..97e6435 100644 (file)
--- a/Documentation/driver-api/uio-howto.rst
+++ b/Documentation/driver-api/uio-howto.rst
@@ -702,6 +702,8 @@ The vmbus device regions are mapped into uio device resources:
     0) Channel ring buffers: guest to host and host to guest
     1) Guest to host interrupt signalling pages
     2) Guest to host monitor page
+    3) Network receive buffer region
+    4) Network send buffer region
 
 Further information
 ===================

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index a0c4c07..dcd80aa 100644 (file)
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -39,6 +39,10 @@
 #define DRIVER_AUTHOR  "Stephen Hemminger <sthemmin at microsoft.com>"
 #define DRIVER_DESC    "Generic UIO driver for VMBus devices"
 
+#define HV_RING_SIZE    512    /* pages */
+#define SEND_BUFFER_SIZE (15 * 1024 * 1024)
+#define RECV_BUFFER_SIZE (15 * 1024 * 1024)
+
 /*
  * List of resources to be mapped to user space
  * can be extended up to MAX_UIO_MAPS(5) items
@@ -47,13 +51,21 @@ enum hv_uio_map {
        TXRX_RING_MAP = 0,
        INT_PAGE_MAP,
        MON_PAGE_MAP,
+       RECV_BUF_MAP,
+       SEND_BUF_MAP
 };
 
-#define HV_RING_SIZE   512
-
 struct hv_uio_private_data {
        struct uio_info info;
        struct hv_device *device;
+
+       void    *recv_buf;
+       u32     recv_gpadl;
+       char    recv_name[32];  /* "recv_4294967295" */
+
+       void    *send_buf;
+       u32     send_gpadl;
+       char    send_name[32];
 };
 
 /*
@@ -91,6 +103,19 @@ static void hv_uio_channel_cb(void *context)
        uio_event_notify(&pdata->info);
 }
 
+
+static void
+hv_uio_cleanup(struct hv_device *dev, struct hv_uio_private_data *pdata)
+{
+       if (pdata->send_gpadl)
+               vmbus_teardown_gpadl(dev->channel, pdata->send_gpadl);
+       vfree(pdata->send_buf);
+
+       if (pdata->recv_gpadl)
+               vmbus_teardown_gpadl(dev->channel, pdata->recv_gpadl);
+       vfree(pdata->recv_buf);
+}
+
 static int
 hv_uio_probe(struct hv_device *dev,
             const struct hv_vmbus_device_id *dev_id)
@@ -137,6 +162,46 @@ hv_uio_probe(struct hv_device *dev,
        pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE;
        pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
 
+       pdata->recv_buf = vzalloc(RECV_BUFFER_SIZE);
+       if (pdata->recv_buf == NULL) {
+               ret = -ENOMEM;
+               goto fail_close;
+       }
+
+       ret = vmbus_establish_gpadl(dev->channel, pdata->recv_buf,
+                                   RECV_BUFFER_SIZE, &pdata->recv_gpadl);
+       if (ret)
+               goto fail_close;
+
+       /* put Global Physical Address Label in name */
+       snprintf(pdata->recv_name, sizeof(pdata->recv_name),
+                "recv:%u", pdata->recv_gpadl);
+       pdata->info.mem[RECV_BUF_MAP].name = pdata->recv_name;
+       pdata->info.mem[RECV_BUF_MAP].addr
+               = (phys_addr_t)pdata->recv_buf;
+       pdata->info.mem[RECV_BUF_MAP].size = RECV_BUFFER_SIZE;
+       pdata->info.mem[RECV_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
+
+
+       pdata->send_buf = vzalloc(SEND_BUFFER_SIZE);
+       if (pdata->send_buf == NULL) {
+               ret = -ENOMEM;
+               goto fail_close;
+       }
+
+       ret = vmbus_establish_gpadl(dev->channel, pdata->send_buf,
+                                   SEND_BUFFER_SIZE, &pdata->send_gpadl);
+       if (ret)
+               goto fail_close;
+
+       snprintf(pdata->send_name, sizeof(pdata->send_name),
+                "send:%u", pdata->send_gpadl);
+       pdata->info.mem[SEND_BUF_MAP].name = pdata->send_name;
+       pdata->info.mem[SEND_BUF_MAP].addr
+               = (phys_addr_t)pdata->send_buf;
+       pdata->info.mem[SEND_BUF_MAP].size = SEND_BUFFER_SIZE;
+       pdata->info.mem[SEND_BUF_MAP].memtype = UIO_MEM_VIRTUAL;
+
        pdata->info.priv = pdata;
        pdata->device = dev;
 
@@ -151,6 +216,7 @@ hv_uio_probe(struct hv_device *dev,
        return 0;
 
 fail_close:
+       hv_uio_cleanup(dev, pdata);
        vmbus_close(dev->channel);
 fail:
        kfree(pdata);
@@ -167,6 +233,7 @@ hv_uio_remove(struct hv_device *dev)
                return 0;
 
        uio_unregister_device(&pdata->info);
+       hv_uio_cleanup(dev, pdata);
        hv_set_drvdata(dev, NULL);
        vmbus_close(dev->channel);
        kfree(pdata);