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Date: Thu, 28 Apr 2022 16:51:07 +0200
From: "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
To: KY Srinivasan <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Stephen Hemminger <sthemmin@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Michael Kelley <mikelley@...rosoft.com>,
Stefano Garzarella <sgarzare@...hat.com>,
David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: linux-hyperv@...r.kernel.org,
virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
"Andrea Parri (Microsoft)" <parri.andrea@...il.com>
Subject: [PATCH hyperv-next v2 5/5] Drivers: hv: vmbus: Refactor the ring-buffer iterator functions
With no users of hv_pkt_iter_next_raw() and no "external" users of
hv_pkt_iter_first_raw(), the iterator functions can be refactored
and simplified to remove some indirection/code.
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
---
drivers/hv/ring_buffer.c | 32 +++++++++-----------------------
include/linux/hyperv.h | 35 ++++-------------------------------
2 files changed, 13 insertions(+), 54 deletions(-)
diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index e101b11f95e5d..59a4aa86d1f35 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -429,7 +429,7 @@ int hv_ringbuffer_read(struct vmbus_channel *channel,
memcpy(buffer, (const char *)desc + offset, packetlen);
/* Advance ring index to next packet descriptor */
- __hv_pkt_iter_next(channel, desc, true);
+ __hv_pkt_iter_next(channel, desc);
/* Notify host of update */
hv_pkt_iter_close(channel);
@@ -464,22 +464,6 @@ static u32 hv_pkt_iter_avail(const struct hv_ring_buffer_info *rbi)
return (rbi->ring_datasize - priv_read_loc) + write_loc;
}
-/*
- * Get first vmbus packet without copying it out of the ring buffer
- */
-struct vmpacket_descriptor *hv_pkt_iter_first_raw(struct vmbus_channel *channel)
-{
- struct hv_ring_buffer_info *rbi = &channel->inbound;
-
- hv_debug_delay_test(channel, MESSAGE_DELAY);
-
- if (hv_pkt_iter_avail(rbi) < sizeof(struct vmpacket_descriptor))
- return NULL;
-
- return (struct vmpacket_descriptor *)(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
-}
-EXPORT_SYMBOL_GPL(hv_pkt_iter_first_raw);
-
/*
* Get first vmbus packet from ring buffer after read_index
*
@@ -491,11 +475,14 @@ struct vmpacket_descriptor *hv_pkt_iter_first(struct vmbus_channel *channel)
struct vmpacket_descriptor *desc, *desc_copy;
u32 bytes_avail, pkt_len, pkt_offset;
- desc = hv_pkt_iter_first_raw(channel);
- if (!desc)
+ hv_debug_delay_test(channel, MESSAGE_DELAY);
+
+ bytes_avail = hv_pkt_iter_avail(rbi);
+ if (bytes_avail < sizeof(struct vmpacket_descriptor))
return NULL;
+ bytes_avail = min(rbi->pkt_buffer_size, bytes_avail);
- bytes_avail = min(rbi->pkt_buffer_size, hv_pkt_iter_avail(rbi));
+ desc = (struct vmpacket_descriptor *)(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
/*
* Ensure the compiler does not use references to incoming Hyper-V values (which
@@ -542,8 +529,7 @@ EXPORT_SYMBOL_GPL(hv_pkt_iter_first);
*/
struct vmpacket_descriptor *
__hv_pkt_iter_next(struct vmbus_channel *channel,
- const struct vmpacket_descriptor *desc,
- bool copy)
+ const struct vmpacket_descriptor *desc)
{
struct hv_ring_buffer_info *rbi = &channel->inbound;
u32 packetlen = desc->len8 << 3;
@@ -556,7 +542,7 @@ __hv_pkt_iter_next(struct vmbus_channel *channel,
rbi->priv_read_index -= dsize;
/* more data? */
- return copy ? hv_pkt_iter_first(channel) : hv_pkt_iter_first_raw(channel);
+ return hv_pkt_iter_first(channel);
}
EXPORT_SYMBOL_GPL(__hv_pkt_iter_next);
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index b028905d8334e..c440c45887c26 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1706,55 +1706,28 @@ static inline u32 hv_pkt_len(const struct vmpacket_descriptor *desc)
return desc->len8 << 3;
}
-struct vmpacket_descriptor *
-hv_pkt_iter_first_raw(struct vmbus_channel *channel);
-
struct vmpacket_descriptor *
hv_pkt_iter_first(struct vmbus_channel *channel);
struct vmpacket_descriptor *
__hv_pkt_iter_next(struct vmbus_channel *channel,
- const struct vmpacket_descriptor *pkt,
- bool copy);
+ const struct vmpacket_descriptor *pkt);
void hv_pkt_iter_close(struct vmbus_channel *channel);
static inline struct vmpacket_descriptor *
-hv_pkt_iter_next_pkt(struct vmbus_channel *channel,
- const struct vmpacket_descriptor *pkt,
- bool copy)
+hv_pkt_iter_next(struct vmbus_channel *channel,
+ const struct vmpacket_descriptor *pkt)
{
struct vmpacket_descriptor *nxt;
- nxt = __hv_pkt_iter_next(channel, pkt, copy);
+ nxt = __hv_pkt_iter_next(channel, pkt);
if (!nxt)
hv_pkt_iter_close(channel);
return nxt;
}
-/*
- * Get next packet descriptor without copying it out of the ring buffer
- * If at end of list, return NULL and update host.
- */
-static inline struct vmpacket_descriptor *
-hv_pkt_iter_next_raw(struct vmbus_channel *channel,
- const struct vmpacket_descriptor *pkt)
-{
- return hv_pkt_iter_next_pkt(channel, pkt, false);
-}
-
-/*
- * Get next packet descriptor from iterator
- * If at end of list, return NULL and update host.
- */
-static inline struct vmpacket_descriptor *
-hv_pkt_iter_next(struct vmbus_channel *channel,
- const struct vmpacket_descriptor *pkt)
-{
- return hv_pkt_iter_next_pkt(channel, pkt, true);
-}
-
#define foreach_vmbus_pkt(pkt, channel) \
for (pkt = hv_pkt_iter_first(channel); pkt; \
pkt = hv_pkt_iter_next(channel, pkt))
--
2.25.1
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