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uio_hv_generic: create send and receive buffers

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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>
This commit is contained in:
Stephen Hemminger
2018-01-09 12:57:30 -08:00
committed by Greg Kroah-Hartman
parent c5702d1b31
commit e7d214642a
2 changed files with 71 additions and 2 deletions
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71
drivers/uio/uio_hv_generic.c
View File

@@ -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);