| Message ID | 20200916034817.30282-11-boqun.feng@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
From: Boqun Feng <boqun.feng@gmail.com> Sent: Tuesday, September 15, 2020 8:48 PM > > For a Hyper-V vmbus, the size of the ringbuffer has two requirements: > > 1) it has to take one PAGE_SIZE for the header > > 2) it has to be PAGE_SIZE aligned so that double-mapping can work > > VMBUS_RING_SIZE() could calculate a correct ringbuffer size which > fulfills both requirements, therefore use it to make sure vmbus work > when PAGE_SIZE != HV_HYP_PAGE_SIZE (4K). > > Note that since the argument for VMBUS_RING_SIZE() is the size of > payload (data part), so it will be minus 4k (the size of header when > PAGE_SIZE = 4k) than the original value to keep the ringbuffer total > size unchanged when PAGE_SIZE = 4k. > > Signed-off-by: Boqun Feng <boqun.feng@gmail.com> > Cc: Michael Kelley <mikelley@microsoft.com> > > --- > Michael, > > I drop your Reviewed-by tag because of the page align issue. Could you > review this updated version? Thanks! > > Regards, > Boqun > > > drivers/hv/hv_util.c | 11 +++++++---- > 1 file changed, 7 insertions(+), 4 deletions(-) > > diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c > index a4e8d96513c2..05566ecdbe4b 100644 > --- a/drivers/hv/hv_util.c > +++ b/drivers/hv/hv_util.c > @@ -500,6 +500,9 @@ static void heartbeat_onchannelcallback(void *context) > } > } > > +#define HV_UTIL_RING_SEND_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE) > +#define HV_UTIL_RING_RECV_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE) > + > static int util_probe(struct hv_device *dev, > const struct hv_vmbus_device_id *dev_id) > { > @@ -530,8 +533,8 @@ static int util_probe(struct hv_device *dev, > > hv_set_drvdata(dev, srv); > > - ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE, > - 4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb, > + ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE, > + HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb, > dev->channel); > if (ret) > goto error; > @@ -590,8 +593,8 @@ static int util_resume(struct hv_device *dev) > return ret; > } > > - ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE, > - 4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb, > + ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE, > + HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb, > dev->channel); > return ret; > } > -- > 2.28.0 Reviewed-by: Michael Kelley <mikelley@microsoft.com>
diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c index a4e8d96513c2..05566ecdbe4b 100644 --- a/drivers/hv/hv_util.c +++ b/drivers/hv/hv_util.c @@ -500,6 +500,9 @@ static void heartbeat_onchannelcallback(void *context) } } +#define HV_UTIL_RING_SEND_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE) +#define HV_UTIL_RING_RECV_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE) + static int util_probe(struct hv_device *dev, const struct hv_vmbus_device_id *dev_id) { @@ -530,8 +533,8 @@ static int util_probe(struct hv_device *dev, hv_set_drvdata(dev, srv); - ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE, - 4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb, + ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE, + HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb, dev->channel); if (ret) goto error; @@ -590,8 +593,8 @@ static int util_resume(struct hv_device *dev) return ret; } - ret = vmbus_open(dev->channel, 4 * HV_HYP_PAGE_SIZE, - 4 * HV_HYP_PAGE_SIZE, NULL, 0, srv->util_cb, + ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE, + HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb, dev->channel); return ret; }
For a Hyper-V vmbus, the size of the ringbuffer has two requirements: 1) it has to take one PAGE_SIZE for the header 2) it has to be PAGE_SIZE aligned so that double-mapping can work VMBUS_RING_SIZE() could calculate a correct ringbuffer size which fulfills both requirements, therefore use it to make sure vmbus work when PAGE_SIZE != HV_HYP_PAGE_SIZE (4K). Note that since the argument for VMBUS_RING_SIZE() is the size of payload (data part), so it will be minus 4k (the size of header when PAGE_SIZE = 4k) than the original value to keep the ringbuffer total size unchanged when PAGE_SIZE = 4k. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Cc: Michael Kelley <mikelley@microsoft.com> --- Michael, I drop your Reviewed-by tag because of the page align issue. Could you review this updated version? Thanks! Regards, Boqun drivers/hv/hv_util.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)