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Revert "Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer"

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This reverts commit a8c3209998.

It is reported that the said commit caused regression in netvsc.

Reported-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Wei Liu
2021-02-15 10:44:58 +00:00
parent fb5ef35165
commit 3019270282
11 changed files with 25 additions and 139 deletions
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48
include/linux/hyperv.h
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@@ -181,10 +181,6 @@ struct hv_ring_buffer_info {
* being freed while the ring buffer is being accessed.
*/
struct mutex ring_buffer_mutex;
/* Buffer that holds a copy of an incoming host packet */
void *pkt_buffer;
u32 pkt_buffer_size;
};
@@ -792,8 +788,6 @@ struct vmbus_device {
bool allowed_in_isolated;
};
#define VMBUS_DEFAULT_MAX_PKT_SIZE 4096
struct vmbus_channel {
struct list_head listentry;
@@ -1016,9 +1010,6 @@ struct vmbus_channel {
/* request/transaction ids for VMBus */
struct vmbus_requestor requestor;
u32 rqstor_size;
/* The max size of a packet on this channel */
u32 max_pkt_size;
};
u64 vmbus_next_request_id(struct vmbus_requestor *rqstor, u64 rqst_addr);
@@ -1660,44 +1651,15 @@ static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc)
}
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)
{
struct vmpacket_descriptor *nxt;
nxt = __hv_pkt_iter_next(channel, pkt, copy);
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.
@@ -1706,7 +1668,13 @@ 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);
struct vmpacket_descriptor *nxt;
nxt = __hv_pkt_iter_next(channel, pkt);
if (!nxt)
hv_pkt_iter_close(channel);
return nxt;
}
#define foreach_vmbus_pkt(pkt, channel) \