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Message-Id: <20220424104140.44841-4-pizhenwei@bytedance.com>
Date: Sun, 24 Apr 2022 18:41:38 +0800
From: zhenwei pi <pizhenwei@...edance.com>
To: arei.gonglei@...wei.com, mst@...hat.com, jasowang@...hat.com
Cc: herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
linux-crypto@...r.kernel.org, helei.sig11@...edance.com,
davem@...emloft.net, zhenwei pi <pizhenwei@...edance.com>
Subject: [PATCH v4 3/5] virtio-crypto: wait ctrl queue instead of busy polling
Originally, after submitting request into virtio crypto control
queue, the guest side polls the result from the virt queue. This
works like following:
CPU0 CPU1 ... CPUx CPUy
| | | |
\ \ / /
\--------spin_lock(&vcrypto->ctrl_lock)-------/
|
virtqueue add & kick
|
busy poll virtqueue
|
spin_unlock(&vcrypto->ctrl_lock)
...
There are two problems:
1, The queue depth is always 1, the performance of a virtio crypto
device gets limited. Multi user processes share a single control
queue, and hit spin lock race from control queue. Test on Intel
Platinum 8260, a single worker gets ~35K/s create/close session
operations, and 8 workers get ~40K/s operations with 800% CPU
utilization.
2, The control request is supposed to get handled immediately, but
in the current implementation of QEMU(v6.2), the vCPU thread kicks
another thread to do this work, the latency also gets unstable.
Tracking latency of virtio_crypto_alg_akcipher_close_session in 5s:
usecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 7 | |
4 -> 7 : 72 | |
8 -> 15 : 186485 |************************|
16 -> 31 : 687 | |
32 -> 63 : 5 | |
64 -> 127 : 3 | |
128 -> 255 : 1 | |
256 -> 511 : 0 | |
512 -> 1023 : 0 | |
1024 -> 2047 : 0 | |
2048 -> 4095 : 0 | |
4096 -> 8191 : 0 | |
8192 -> 16383 : 2 | |
This means that a CPU may hold vcrypto->ctrl_lock as long as 8192~16383us.
To improve the performance of control queue, a request on control queue
waits completion instead of busy polling to reduce lock racing, and gets
completed by control queue callback.
CPU0 CPU1 ... CPUx CPUy
| | | |
\ \ / /
\--------spin_lock(&vcrypto->ctrl_lock)-------/
|
virtqueue add & kick
|
---------spin_unlock(&vcrypto->ctrl_lock)------
/ / \ \
| | | |
wait wait wait wait
Test this patch, the guest side get ~200K/s operations with 300% CPU
utilization.
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Gonglei <arei.gonglei@...wei.com>
Signed-off-by: zhenwei pi <pizhenwei@...edance.com>
---
.../virtio/virtio_crypto_akcipher_algs.c | 29 ++---------
drivers/crypto/virtio/virtio_crypto_common.h | 4 ++
drivers/crypto/virtio/virtio_crypto_core.c | 52 ++++++++++++++++++-
.../virtio/virtio_crypto_skcipher_algs.c | 34 ++----------
4 files changed, 64 insertions(+), 55 deletions(-)
diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index 509884e8b201..1e98502830cf 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -103,7 +103,6 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
struct scatterlist outhdr_sg, key_sg, inhdr_sg, *sgs[3];
struct virtio_crypto *vcrypto = ctx->vcrypto;
uint8_t *pkey;
- unsigned int inlen;
int err;
unsigned int num_out = 0, num_in = 0;
struct virtio_crypto_op_ctrl_req *ctrl;
@@ -135,18 +134,9 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
sg_init_one(&inhdr_sg, input, sizeof(*input));
sgs[num_out + num_in++] = &inhdr_sg;
- spin_lock(&vcrypto->ctrl_lock);
- err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
- if (err < 0) {
- spin_unlock(&vcrypto->ctrl_lock);
+ err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
+ if (err < 0)
goto out;
- }
-
- virtqueue_kick(vcrypto->ctrl_vq);
- while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
- !virtqueue_is_broken(vcrypto->ctrl_vq))
- cpu_relax();
- spin_unlock(&vcrypto->ctrl_lock);
if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
err = -EINVAL;
@@ -173,7 +163,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
struct scatterlist outhdr_sg, inhdr_sg, *sgs[2];
struct virtio_crypto_destroy_session_req *destroy_session;
struct virtio_crypto *vcrypto = ctx->vcrypto;
- unsigned int num_out = 0, num_in = 0, inlen;
+ unsigned int num_out = 0, num_in = 0;
int err;
struct virtio_crypto_op_ctrl_req *ctrl;
struct virtio_crypto_inhdr *ctrl_status;
@@ -205,18 +195,9 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
sg_init_one(&inhdr_sg, &ctrl_status->status, sizeof(ctrl_status->status));
sgs[num_out + num_in++] = &inhdr_sg;
- spin_lock(&vcrypto->ctrl_lock);
- err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
- if (err < 0) {
- spin_unlock(&vcrypto->ctrl_lock);
+ err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
+ if (err < 0)
goto out;
- }
-
- virtqueue_kick(vcrypto->ctrl_vq);
- while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
- !virtqueue_is_broken(vcrypto->ctrl_vq))
- cpu_relax();
- spin_unlock(&vcrypto->ctrl_lock);
if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
err = -EINVAL;
diff --git a/drivers/crypto/virtio/virtio_crypto_common.h b/drivers/crypto/virtio/virtio_crypto_common.h
index 2422237ec4e6..59a4c0259456 100644
--- a/drivers/crypto/virtio/virtio_crypto_common.h
+++ b/drivers/crypto/virtio/virtio_crypto_common.h
@@ -90,6 +90,7 @@ struct virtio_crypto_ctrl_request {
struct virtio_crypto_op_ctrl_req ctrl;
struct virtio_crypto_session_input input;
struct virtio_crypto_inhdr ctrl_status;
+ struct completion compl;
};
struct virtio_crypto_request;
@@ -141,5 +142,8 @@ int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto);
void virtio_crypto_skcipher_algs_unregister(struct virtio_crypto *vcrypto);
int virtio_crypto_akcipher_algs_register(struct virtio_crypto *vcrypto);
void virtio_crypto_akcipher_algs_unregister(struct virtio_crypto *vcrypto);
+int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct scatterlist *sgs[],
+ unsigned int out_sgs, unsigned int in_sgs,
+ struct virtio_crypto_ctrl_request *vc_ctrl_req);
#endif /* _VIRTIO_CRYPTO_COMMON_H */
diff --git a/drivers/crypto/virtio/virtio_crypto_core.c b/drivers/crypto/virtio/virtio_crypto_core.c
index c6f482db0bc0..60490ffa3df1 100644
--- a/drivers/crypto/virtio/virtio_crypto_core.c
+++ b/drivers/crypto/virtio/virtio_crypto_core.c
@@ -22,6 +22,56 @@ virtcrypto_clear_request(struct virtio_crypto_request *vc_req)
}
}
+static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request *vc_ctrl_req)
+{
+ complete(&vc_ctrl_req->compl);
+}
+
+static void virtcrypto_ctrlq_callback(struct virtqueue *vq)
+{
+ struct virtio_crypto *vcrypto = vq->vdev->priv;
+ struct virtio_crypto_ctrl_request *vc_ctrl_req;
+ unsigned long flags;
+ unsigned int len;
+
+ spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
+ do {
+ virtqueue_disable_cb(vq);
+ while ((vc_ctrl_req = virtqueue_get_buf(vq, &len)) != NULL) {
+ spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+ virtio_crypto_ctrlq_callback(vc_ctrl_req);
+ spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
+ }
+ if (unlikely(virtqueue_is_broken(vq)))
+ break;
+ } while (!virtqueue_enable_cb(vq));
+ spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+}
+
+int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct scatterlist *sgs[],
+ unsigned int out_sgs, unsigned int in_sgs,
+ struct virtio_crypto_ctrl_request *vc_ctrl_req)
+{
+ int err;
+ unsigned long flags;
+
+ init_completion(&vc_ctrl_req->compl);
+
+ spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
+ err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, out_sgs, in_sgs, vc_ctrl_req, GFP_ATOMIC);
+ if (err < 0) {
+ spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+ return err;
+ }
+
+ virtqueue_kick(vcrypto->ctrl_vq);
+ spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+
+ wait_for_completion(&vc_ctrl_req->compl);
+
+ return 0;
+}
+
static void virtcrypto_dataq_callback(struct virtqueue *vq)
{
struct virtio_crypto *vcrypto = vq->vdev->priv;
@@ -73,7 +123,7 @@ static int virtcrypto_find_vqs(struct virtio_crypto *vi)
goto err_names;
/* Parameters for control virtqueue */
- callbacks[total_vqs - 1] = NULL;
+ callbacks[total_vqs - 1] = virtcrypto_ctrlq_callback;
names[total_vqs - 1] = "controlq";
/* Allocate/initialize parameters for data virtqueues */
diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 6aaf0869b211..e553ccadbcbc 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -118,7 +118,6 @@ static int virtio_crypto_alg_skcipher_init_session(
int encrypt)
{
struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
- unsigned int tmp;
struct virtio_crypto *vcrypto = ctx->vcrypto;
int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
int err;
@@ -170,23 +169,9 @@ static int virtio_crypto_alg_skcipher_init_session(
sg_init_one(&inhdr, input, sizeof(*input));
sgs[num_out + num_in++] = &inhdr;
- spin_lock(&vcrypto->ctrl_lock);
- err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
- num_in, vcrypto, GFP_ATOMIC);
- if (err < 0) {
- spin_unlock(&vcrypto->ctrl_lock);
+ err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
+ if (err < 0)
goto out;
- }
- virtqueue_kick(vcrypto->ctrl_vq);
-
- /*
- * Trapping into the hypervisor, so the request should be
- * handled immediately.
- */
- while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
- !virtqueue_is_broken(vcrypto->ctrl_vq))
- cpu_relax();
- spin_unlock(&vcrypto->ctrl_lock);
if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Create session failed status: %u\n",
@@ -212,7 +197,6 @@ static int virtio_crypto_alg_skcipher_close_session(
int encrypt)
{
struct scatterlist outhdr, status_sg, *sgs[2];
- unsigned int tmp;
struct virtio_crypto_destroy_session_req *destroy_session;
struct virtio_crypto *vcrypto = ctx->vcrypto;
int err;
@@ -247,19 +231,9 @@ static int virtio_crypto_alg_skcipher_close_session(
sg_init_one(&status_sg, &ctrl_status->status, sizeof(ctrl_status->status));
sgs[num_out + num_in++] = &status_sg;
- spin_lock(&vcrypto->ctrl_lock);
- err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
- num_in, vcrypto, GFP_ATOMIC);
- if (err < 0) {
- spin_unlock(&vcrypto->ctrl_lock);
+ err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req);
+ if (err < 0)
goto out;
- }
- virtqueue_kick(vcrypto->ctrl_vq);
-
- while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
- !virtqueue_is_broken(vcrypto->ctrl_vq))
- cpu_relax();
- spin_unlock(&vcrypto->ctrl_lock);
if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
--
2.20.1
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