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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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14
drivers/hv/channel.c
View file

@ -1189,15 +1189,14 @@ EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
* vmbus_next_request_id - Returns a new request id. It is also
* the index at which the guest memory address is stored.
* Uses a spin lock to avoid race conditions.
* @rqstor: Pointer to the requestor struct
* @channel: Pointer to the VMbus channel struct
* @rqst_add: Guest memory address to be stored in the array
*/
u64 vmbus_next_request_id(struct vmbus_requestor *rqstor, u64 rqst_addr)
u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr)
{
struct vmbus_requestor *rqstor = &channel->requestor;
unsigned long flags;
u64 current_id;
const struct vmbus_channel *channel =
container_of(rqstor, const struct vmbus_channel, requestor);
/* Check rqstor has been initialized */
if (!channel->rqstor_size)
@ -1231,16 +1230,15 @@ EXPORT_SYMBOL_GPL(vmbus_next_request_id);
/*
* vmbus_request_addr - Returns the memory address stored at @trans_id
* in @rqstor. Uses a spin lock to avoid race conditions.
* @rqstor: Pointer to the requestor struct
* @channel: Pointer to the VMbus channel struct
* @trans_id: Request id sent back from Hyper-V. Becomes the requestor's
* next request id.
*/
u64 vmbus_request_addr(struct vmbus_requestor *rqstor, u64 trans_id)
u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id)
{
struct vmbus_requestor *rqstor = &channel->requestor;
unsigned long flags;
u64 req_addr;
const struct vmbus_channel *channel =
container_of(rqstor, const struct vmbus_channel, requestor);
/* Check rqstor has been initialized */
if (!channel->rqstor_size)

13
drivers/hv/ring_buffer.c
View file

@ -312,10 +312,12 @@ int hv_ringbuffer_write(struct vmbus_channel *channel,
*/
if (desc->flags == VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED) {
rqst_id = vmbus_next_request_id(&channel->requestor, requestid);
if (rqst_id == VMBUS_RQST_ERROR) {
spin_unlock_irqrestore(&outring_info->ring_lock, flags);
return -EAGAIN;
if (channel->next_request_id_callback != NULL) {
rqst_id = channel->next_request_id_callback(channel, requestid);
if (rqst_id == VMBUS_RQST_ERROR) {
spin_unlock_irqrestore(&outring_info->ring_lock, flags);
return -EAGAIN;
}
}
}
desc = hv_get_ring_buffer(outring_info) + old_write;
@ -343,7 +345,8 @@ int hv_ringbuffer_write(struct vmbus_channel *channel,
if (channel->rescind) {
if (rqst_id != VMBUS_NO_RQSTOR) {
/* Reclaim request ID to avoid leak of IDs */
vmbus_request_addr(&channel->requestor, rqst_id);
if (channel->request_addr_callback != NULL)
channel->request_addr_callback(channel, rqst_id);
}
return -ENODEV;
}

8
drivers/net/hyperv/netvsc.c
View file

@ -757,7 +757,7 @@ static void netvsc_send_tx_complete(struct net_device *ndev,
int queue_sends;
u64 cmd_rqst;
cmd_rqst = vmbus_request_addr(&channel->requestor, (u64)desc->trans_id);
cmd_rqst = channel->request_addr_callback(channel, (u64)desc->trans_id);
if (cmd_rqst == VMBUS_RQST_ERROR) {
netdev_err(ndev, "Incorrect transaction id\n");
return;
@ -817,8 +817,8 @@ static void netvsc_send_completion(struct net_device *ndev,
/* First check if this is a VMBUS completion without data payload */
if (!msglen) {
cmd_rqst = vmbus_request_addr(&incoming_channel->requestor,
(u64)desc->trans_id);
cmd_rqst = incoming_channel->request_addr_callback(incoming_channel,
(u64)desc->trans_id);
if (cmd_rqst == VMBUS_RQST_ERROR) {
netdev_err(ndev, "Invalid transaction id\n");
return;
@ -1649,6 +1649,8 @@ struct netvsc_device *netvsc_device_add(struct hv_device *device,
netvsc_poll, NAPI_POLL_WEIGHT);
/* Open the channel */
device->channel->next_request_id_callback = vmbus_next_request_id;
device->channel->request_addr_callback = vmbus_request_addr;
device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
device->channel->max_pkt_size = NETVSC_MAX_PKT_SIZE;

2
drivers/net/hyperv/rndis_filter.c
View file

@ -1259,6 +1259,8 @@ static void netvsc_sc_open(struct vmbus_channel *new_sc)
/* Set the channel before opening.*/
nvchan->channel = new_sc;
new_sc->next_request_id_callback = vmbus_next_request_id;
new_sc->request_addr_callback = vmbus_request_addr;
new_sc->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
new_sc->max_pkt_size = NETVSC_MAX_PKT_SIZE;

94
drivers/scsi/storvsc_drv.c
View file

@ -696,6 +696,23 @@ static void storvsc_change_target_cpu(struct vmbus_channel *channel, u32 old,
spin_unlock_irqrestore(&stor_device->lock, flags);
}
static u64 storvsc_next_request_id(struct vmbus_channel *channel, u64 rqst_addr)
{
struct storvsc_cmd_request *request =
(struct storvsc_cmd_request *)(unsigned long)rqst_addr;
if (rqst_addr == VMBUS_RQST_INIT)
return VMBUS_RQST_INIT;
if (rqst_addr == VMBUS_RQST_RESET)
return VMBUS_RQST_RESET;
/*
* Cannot return an ID of 0, which is reserved for an unsolicited
* message from Hyper-V.
*/
return (u64)blk_mq_unique_tag(request->cmd->request) + 1;
}
static void handle_sc_creation(struct vmbus_channel *new_sc)
{
struct hv_device *device = new_sc->primary_channel->device_obj;
@ -711,11 +728,7 @@ static void handle_sc_creation(struct vmbus_channel *new_sc)
memset(&props, 0, sizeof(struct vmstorage_channel_properties));
new_sc->max_pkt_size = STORVSC_MAX_PKT_SIZE;
/*
* The size of vmbus_requestor is an upper bound on the number of requests
* that can be in-progress at any one time across all channels.
*/
new_sc->rqstor_size = scsi_driver.can_queue;
new_sc->next_request_id_callback = storvsc_next_request_id;
ret = vmbus_open(new_sc,
storvsc_ringbuffer_size,
@ -782,7 +795,7 @@ static void handle_multichannel_storage(struct hv_device *device, int max_chns)
ret = vmbus_sendpacket(device->channel, vstor_packet,
(sizeof(struct vstor_packet) -
stor_device->vmscsi_size_delta),
(unsigned long)request,
VMBUS_RQST_INIT,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
@ -851,7 +864,7 @@ static int storvsc_execute_vstor_op(struct hv_device *device,
ret = vmbus_sendpacket(device->channel, vstor_packet,
(sizeof(struct vstor_packet) -
stor_device->vmscsi_size_delta),
(unsigned long)request,
VMBUS_RQST_INIT,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if (ret != 0)
@ -1253,6 +1266,7 @@ static void storvsc_on_channel_callback(void *context)
const struct vmpacket_descriptor *desc;
struct hv_device *device;
struct storvsc_device *stor_device;
struct Scsi_Host *shost;
if (channel->primary_channel != NULL)
device = channel->primary_channel->device_obj;
@ -1263,20 +1277,12 @@ static void storvsc_on_channel_callback(void *context)
if (!stor_device)
return;
shost = stor_device->host;
foreach_vmbus_pkt(desc, channel) {
void *packet = hv_pkt_data(desc);
struct storvsc_cmd_request *request;
u64 cmd_rqst;
cmd_rqst = vmbus_request_addr(&channel->requestor,
desc->trans_id);
if (cmd_rqst == VMBUS_RQST_ERROR) {
dev_err(&device->device,
"Incorrect transaction id\n");
continue;
}
request = (struct storvsc_cmd_request *)(unsigned long)cmd_rqst;
struct vstor_packet *packet = hv_pkt_data(desc);
struct storvsc_cmd_request *request = NULL;
u64 rqst_id = desc->trans_id;
if (hv_pkt_datalen(desc) < sizeof(struct vstor_packet) -
stor_device->vmscsi_size_delta) {
@ -1284,14 +1290,44 @@ static void storvsc_on_channel_callback(void *context)
continue;
}
if (request == &stor_device->init_request ||
request == &stor_device->reset_request) {
memcpy(&request->vstor_packet, packet,
(sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta));
complete(&request->wait_event);
if (rqst_id == VMBUS_RQST_INIT) {
request = &stor_device->init_request;
} else if (rqst_id == VMBUS_RQST_RESET) {
request = &stor_device->reset_request;
} else {
/* Hyper-V can send an unsolicited message with ID of 0 */
if (rqst_id == 0) {
/*
* storvsc_on_receive() looks at the vstor_packet in the message
* from the ring buffer. If the operation in the vstor_packet is
* COMPLETE_IO, then we call storvsc_on_io_completion(), and
* dereference the guest memory address. Make sure we don't call
* storvsc_on_io_completion() with a guest memory address that is
* zero if Hyper-V were to construct and send such a bogus packet.
*/
if (packet->operation == VSTOR_OPERATION_COMPLETE_IO) {
dev_err(&device->device, "Invalid packet with ID of 0\n");
continue;
}
} else {
struct scsi_cmnd *scmnd;
/* Transaction 'rqst_id' corresponds to tag 'rqst_id - 1' */
scmnd = scsi_host_find_tag(shost, rqst_id - 1);
if (scmnd == NULL) {
dev_err(&device->device, "Incorrect transaction ID\n");
continue;
}
request = (struct storvsc_cmd_request *)scsi_cmd_priv(scmnd);
}
storvsc_on_receive(stor_device, packet, request);
continue;
}
memcpy(&request->vstor_packet, packet,
(sizeof(struct vstor_packet) - stor_device->vmscsi_size_delta));
complete(&request->wait_event);
}
}
@ -1304,11 +1340,7 @@ static int storvsc_connect_to_vsp(struct hv_device *device, u32 ring_size,
memset(&props, 0, sizeof(struct vmstorage_channel_properties));
device->channel->max_pkt_size = STORVSC_MAX_PKT_SIZE;
/*
* The size of vmbus_requestor is an upper bound on the number of requests
* that can be in-progress at any one time across all channels.
*/
device->channel->rqstor_size = scsi_driver.can_queue;
device->channel->next_request_id_callback = storvsc_next_request_id;
ret = vmbus_open(device->channel,
ring_size,
@ -1634,7 +1666,7 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
ret = vmbus_sendpacket(device->channel, vstor_packet,
(sizeof(struct vstor_packet) -
stor_device->vmscsi_size_delta),
(unsigned long)&stor_device->reset_request,
VMBUS_RQST_RESET,
VM_PKT_DATA_INBAND,
VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
if (ret != 0)

13
include/linux/hyperv.h
View file

@ -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)
{