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scsi: storvsc: Use blk_mq_unique_tag() to generate requestIDs

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Use blk_mq_unique_tag() to generate requestIDs for StorVSC, avoiding
all issues with allocating enough entries in the VMbus requestor.

Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210510210841.370472-1-parri.andrea@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Andrea Parri (Microsoft)
2021-05-10 23:08:41 +02:00
committed by Wei Liu
parent adae1e931a
commit bf5fd8cae3
6 changed files with 95 additions and 49 deletions
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13
include/linux/hyperv.h
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@@ -794,7 +794,11 @@ struct vmbus_requestor {
#define VMBUS_NO_RQSTOR U64_MAX
#define VMBUS_RQST_ERROR (U64_MAX - 1)
/* NetVSC-specific */
#define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2)
/* StorVSC-specific */
#define VMBUS_RQST_INIT (U64_MAX - 2)
#define VMBUS_RQST_RESET (U64_MAX - 3)
struct vmbus_device {
u16 dev_type;
@@ -1024,6 +1028,11 @@ struct vmbus_channel {
u32 fuzz_testing_interrupt_delay;
u32 fuzz_testing_message_delay;
/* callback to generate a request ID from a request address */
u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr);
/* callback to retrieve a request address from a request ID */
u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id);
/* request/transaction ids for VMBus */
struct vmbus_requestor requestor;
u32 rqstor_size;
@@ -1032,8 +1041,8 @@ struct vmbus_channel {
u32 max_pkt_size;
};
u64 vmbus_next_request_id(struct vmbus_requestor *rqstor, u64 rqst_addr);
u64 vmbus_request_addr(struct vmbus_requestor *rqstor, u64 trans_id);
u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr);
u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id);
static inline bool is_hvsock_channel(const struct vmbus_channel *c)
{