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| author | Stephen Hemminger <stephen@networkplumber.org> | 2017-02-11 23:02:23 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-14 10:20:35 -0800 |
| commit | 6e47dd3e2938f41d75045bbcb64aa9df3a463b2a (patch) | |
| tree | f38bc54aecf8a392aba00143586ff6105e2c9f8d /include/linux/hyperv.h | |
| parent | 5529eaf6e79a61e0ca7ade257f31d2ababc7f6c9 (diff) | |
| download | linux-6e47dd3e2938f41d75045bbcb64aa9df3a463b2a.tar.gz linux-6e47dd3e2938f41d75045bbcb64aa9df3a463b2a.tar.bz2 linux-6e47dd3e2938f41d75045bbcb64aa9df3a463b2a.zip | |
vmbus: expose hv_begin/end_read
In order to implement NAPI in netvsc, the driver needs access to
control host interrupt mask.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/hyperv.h')
| -rw-r--r-- | include/linux/hyperv.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 466374dbc98f..08eb71a22c14 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1513,6 +1513,36 @@ init_cached_read_index(struct vmbus_channel *channel) } /* + * Mask off host interrupt callback notifications + */ +static inline void hv_begin_read(struct hv_ring_buffer_info *rbi) +{ + rbi->ring_buffer->interrupt_mask = 1; + + /* make sure mask update is not reordered */ + virt_mb(); +} + +/* + * Re-enable host callback and return number of outstanding bytes + */ +static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi) +{ + + rbi->ring_buffer->interrupt_mask = 0; + + /* make sure mask update is not reordered */ + virt_mb(); + + /* + * Now check to see if the ring buffer is still empty. + * If it is not, we raced and we need to process new + * incoming messages. + */ + return hv_get_bytes_to_read(rbi); +} + +/* * An API to support in-place processing of incoming VMBUS packets. */ #define VMBUS_PKT_TRAILER 8 |