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vmbus: eliminate duplicate cached index

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Don't need cached read index anymore now that packet iterator
is used. The iterator has the original read index until the
visible read_index is updated.

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>
This commit is contained in:
Stephen Hemminger 2017-06-25 12:30:27 -07:00 committed by Greg Kroah-Hartman
parent 8dd45f2ab0
commit 05d00bc94a
2 changed files with 4 additions and 27 deletions
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17
drivers/hv/ring_buffer.c
View File

@ -358,9 +358,6 @@ struct vmpacket_descriptor *hv_pkt_iter_first(struct vmbus_channel *channel)
{
struct hv_ring_buffer_info *rbi = &channel->inbound;
/* set state for later hv_pkt_iter_close */
rbi->cached_read_index = rbi->ring_buffer->read_index;
if (hv_pkt_iter_avail(rbi) < sizeof(struct vmpacket_descriptor))
return NULL;
@ -388,10 +385,7 @@ __hv_pkt_iter_next(struct vmbus_channel *channel,
rbi->priv_read_index -= dsize;
/* more data? */
if (hv_pkt_iter_avail(rbi) < sizeof(struct vmpacket_descriptor))
return NULL;
else
return hv_get_ring_buffer(rbi) + rbi->priv_read_index;
return hv_pkt_iter_first(channel);
}
EXPORT_SYMBOL_GPL(__hv_pkt_iter_next);
@ -401,7 +395,7 @@ EXPORT_SYMBOL_GPL(__hv_pkt_iter_next);
void hv_pkt_iter_close(struct vmbus_channel *channel)
{
struct hv_ring_buffer_info *rbi = &channel->inbound;
u32 cur_write_sz, cached_write_sz;
u32 orig_write_sz = hv_get_bytes_to_write(rbi);
u32 pending_sz;
/*
@ -430,13 +424,10 @@ void hv_pkt_iter_close(struct vmbus_channel *channel)
if (pending_sz == 0)
return;
cur_write_sz = hv_get_bytes_to_write(rbi);
if (cur_write_sz < pending_sz)
if (hv_get_bytes_to_write(rbi) < pending_sz)
return;
cached_write_sz = hv_get_cached_bytes_to_write(rbi);
if (cached_write_sz < pending_sz)
if (orig_write_sz < pending_sz)
vmbus_setevent(channel);
}
EXPORT_SYMBOL_GPL(hv_pkt_iter_close);

14
include/linux/hyperv.h
View File

@ -125,7 +125,6 @@ struct hv_ring_buffer_info {
u32 ring_datasize; /* < ring_size */
u32 priv_read_index;
u32 cached_read_index;
};
/*
@ -178,19 +177,6 @@ static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
return write;
}
static inline u32 hv_get_cached_bytes_to_write(
const struct hv_ring_buffer_info *rbi)
{
u32 read_loc, write_loc, dsize, write;
dsize = rbi->ring_datasize;
read_loc = rbi->cached_read_index;
write_loc = rbi->ring_buffer->write_index;
write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
read_loc - write_loc;
return write;
}
/*
* VMBUS version is 32 bit entity broken up into
* two 16 bit quantities: major_number. minor_number.