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cifs: smbd: Check and extend sender credits in interrupt context 

When a RDMA packet is received and server is extending send credits, we should
check and unblock senders immediately in IRQ context. Doing it in a worker
queue causes unnecessary delay and doesn't save much CPU on the receive path.

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Long Li 2020-03-26 22:33:01 -07:00 committed by Steve French
parent f7950cb05d
commit 4ebb8795a7
2 changed files with 15 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
fs/cifs/smbdirect.c
View File

@ -459,25 +459,6 @@ static void smbd_post_send_credits(struct work_struct *work)
check_and_send_immediate(info);
}
static void smbd_recv_done_work(struct work_struct *work)
{
struct smbd_connection *info =
container_of(work, struct smbd_connection, recv_done_work);
/*
* We may have new send credits granted from remote peer
* If any sender is blcoked on lack of credets, unblock it
*/
if (atomic_read(&info->send_credits))
wake_up_interruptible(&info->wait_send_queue);
/*
* Check if we need to send something to remote peer to
* grant more credits or respond to KEEP_ALIVE packet
*/
check_and_send_immediate(info);
}
/* Called from softirq, when recv is done */
static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
{
@ -546,8 +527,15 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
atomic_dec(&info->receive_credits);
info->receive_credit_target =
le16_to_cpu(data_transfer->credits_requested);
atomic_add(le16_to_cpu(data_transfer->credits_granted),
&info->send_credits);
if (le16_to_cpu(data_transfer->credits_granted)) {
atomic_add(le16_to_cpu(data_transfer->credits_granted),
&info->send_credits);
/*
* We have new send credits granted from remote peer
* If any sender is waiting for credits, unblock it
*/
wake_up_interruptible(&info->wait_send_queue);
}
log_incoming(INFO, "data flags %d data_offset %d "
"data_length %d remaining_data_length %d\n",
@ -563,7 +551,12 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
info->keep_alive_requested = KEEP_ALIVE_PENDING;
}
queue_work(info->workqueue, &info->recv_done_work);
/*
* Check if we need to send something to remote peer to
* grant more credits or respond to KEEP_ALIVE packet
*/
check_and_send_immediate(info);
return;
default:
@ -1762,7 +1755,6 @@ static struct smbd_connection *_smbd_get_connection(
atomic_set(&info->send_payload_pending, 0);
INIT_WORK(&info->disconnect_work, smbd_disconnect_rdma_work);
INIT_WORK(&info->recv_done_work, smbd_recv_done_work);
INIT_WORK(&info->post_send_credits_work, smbd_post_send_credits);
info->new_credits_offered = 0;
spin_lock_init(&info->lock_new_credits_offered);

1
fs/cifs/smbdirect.h
View File

@ -67,7 +67,6 @@ struct smbd_connection {
bool negotiate_done;
struct work_struct disconnect_work;
struct work_struct recv_done_work;
struct work_struct post_send_credits_work;
spinlock_t lock_new_credits_offered;