Hi Michael, > > Subject: [virtio-dev] Re: [PATCH v2 2/2] crypto: add virtio-crypto driver > > On Tue, Nov 22, 2016 at 04:10:23PM +0800, Gonglei wrote: > > This patch introduces virtio-crypto driver for Linux Kernel. > > > > The virtio crypto device is a virtual cryptography device > > as well as a kind of virtual hardware accelerator for > > virtual machines. The encryption anddecryption requests > > are placed in the data queue and are ultimately handled by > > thebackend crypto accelerators. The second queue is the > > control queue used to create or destroy sessions for > > symmetric algorithms and will control some advanced features > > in the future. The virtio crypto device provides the following > > cryptoservices: CIPHER, MAC, HASH, and AEAD. > > > > For more information about virtio-crypto device, please see: > > http://qemu-project.org/Features/VirtioCrypto > > > > CC: Michael S. Tsirkin <mst@xxxxxxxxxx> > > CC: Cornelia Huck <cornelia.huck@xxxxxxxxxx> > > CC: Stefan Hajnoczi <stefanha@xxxxxxxxxx> > > CC: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> > > CC: Halil Pasic <pasic@xxxxxxxxxxxxxxxxxx> > > CC: David S. Miller <davem@xxxxxxxxxxxxx> > > CC: Zeng Xin <xin.zeng@xxxxxxxxx> > > Signed-off-by: Gonglei <arei.gonglei@xxxxxxxxxx> > > --- > > MAINTAINERS | 8 + > > drivers/crypto/Kconfig | 2 + > > drivers/crypto/Makefile | 1 + > > drivers/crypto/virtio/Kconfig | 10 + > > drivers/crypto/virtio/Makefile | 5 + > > drivers/crypto/virtio/virtio_crypto.c | 444 > +++++++++++++++++++++++ > > drivers/crypto/virtio/virtio_crypto_algs.c | 524 > +++++++++++++++++++++++++++ > > drivers/crypto/virtio/virtio_crypto_common.h | 124 +++++++ > > drivers/crypto/virtio/virtio_crypto_mgr.c | 258 +++++++++++++ > > include/uapi/linux/Kbuild | 1 + > > include/uapi/linux/virtio_crypto.h | 435 > ++++++++++++++++++++++ > > include/uapi/linux/virtio_ids.h | 1 + > > 12 files changed, 1813 insertions(+) > > create mode 100644 drivers/crypto/virtio/Kconfig > > create mode 100644 drivers/crypto/virtio/Makefile > > create mode 100644 drivers/crypto/virtio/virtio_crypto.c > > create mode 100644 drivers/crypto/virtio/virtio_crypto_algs.c > > create mode 100644 drivers/crypto/virtio/virtio_crypto_common.h > > create mode 100644 drivers/crypto/virtio/virtio_crypto_mgr.c > > create mode 100644 include/uapi/linux/virtio_crypto.h > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 411e3b8..d6b18bb 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -12844,6 +12844,14 @@ S: Maintained > > F: drivers/virtio/virtio_input.c > > F: include/uapi/linux/virtio_input.h > > > > +VIRTIO CRYPTO DRIVER > > +M: Gonglei <arei.gonglei@xxxxxxxxxx> > > +L: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx > > +L: linux-crypto@xxxxxxxxxxxxxxx > > +S: Maintained > > +F: drivers/crypto/virtio/ > > +F: include/uapi/linux/virtio_crypto.h > > + > > VIA RHINE NETWORK DRIVER > > S: Orphan > > F: drivers/net/ethernet/via/via-rhine.c > > diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig > > index 4d2b81f..7956478 100644 > > --- a/drivers/crypto/Kconfig > > +++ b/drivers/crypto/Kconfig > > @@ -555,4 +555,6 @@ config CRYPTO_DEV_ROCKCHIP > > > > source "drivers/crypto/chelsio/Kconfig" > > > > +source "drivers/crypto/virtio/Kconfig" > > + > > endif # CRYPTO_HW > > diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile > > index ad7250f..bc53cb8 100644 > > --- a/drivers/crypto/Makefile > > +++ b/drivers/crypto/Makefile > > @@ -32,3 +32,4 @@ obj-$(CONFIG_CRYPTO_DEV_VMX) += vmx/ > > obj-$(CONFIG_CRYPTO_DEV_SUN4I_SS) += sunxi-ss/ > > obj-$(CONFIG_CRYPTO_DEV_ROCKCHIP) += rockchip/ > > obj-$(CONFIG_CRYPTO_DEV_CHELSIO) += chelsio/ > > +obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio/ > > diff --git a/drivers/crypto/virtio/Kconfig b/drivers/crypto/virtio/Kconfig > > new file mode 100644 > > index 0000000..ceae88c > > --- /dev/null > > +++ b/drivers/crypto/virtio/Kconfig > > @@ -0,0 +1,10 @@ > > +config CRYPTO_DEV_VIRTIO > > + tristate "VirtIO crypto driver" > > + depends on VIRTIO > > + select CRYPTO_AEAD > > + select CRYPTO_AUTHENC > > + select CRYPTO_BLKCIPHER > > + default m > > + help > > + This driver provides support for virtio crypto device. If you > > + choose 'M' here, this module will be called virtio-crypto. > > diff --git a/drivers/crypto/virtio/Makefile b/drivers/crypto/virtio/Makefile > > new file mode 100644 > > index 0000000..a316e92 > > --- /dev/null > > +++ b/drivers/crypto/virtio/Makefile > > @@ -0,0 +1,5 @@ > > +obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio-crypto.o > > +virtio-crypto-objs := \ > > + virtio_crypto_algs.o \ > > + virtio_crypto_mgr.o \ > > + virtio_crypto.o > > diff --git a/drivers/crypto/virtio/virtio_crypto.c > b/drivers/crypto/virtio/virtio_crypto.c > > new file mode 100644 > > index 0000000..56fdfed > > --- /dev/null > > +++ b/drivers/crypto/virtio/virtio_crypto.c > > @@ -0,0 +1,444 @@ > > + /* Driver for Virtio crypto device. > > + * > > + * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD. > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License as published by > > + * the Free Software Foundation; either version 2 of the License, or > > + * (at your option) any later version. > > + * > > + * This program is distributed in the hope that it will be useful, > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > > + * GNU General Public License for more details. > > + * > > + * You should have received a copy of the GNU General Public License > > + * along with this program; if not, see <http://www.gnu.org/licenses/>. > > + */ > > + > > +#include <linux/err.h> > > +#include <linux/module.h> > > +#include <linux/virtio_config.h> > > +#include <linux/cpu.h> > > + > > +#include <uapi/linux/virtio_crypto.h> > > +#include "virtio_crypto_common.h" > > + > > + > > +static void virtcrypto_dataq_callback(struct virtqueue *vq) > > +{ > > + struct virtio_crypto *vcrypto = vq->vdev->priv; > > + struct virtio_crypto_request *vc_req; > > + unsigned long flags; > > + unsigned int len; > > + struct ablkcipher_request *ablk_req; > > + int error; > > + > > + spin_lock_irqsave(&vcrypto->lock, flags); > > + do { > > + virtqueue_disable_cb(vq); > > + while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) { > > + if (vc_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) { > > + switch (vc_req->status) { > > + case VIRTIO_CRYPTO_OK: > > + error = 0; > > + break; > > + case VIRTIO_CRYPTO_INVSESS: > > + case VIRTIO_CRYPTO_ERR: > > + error = -EINVAL; > > + break; > > + case VIRTIO_CRYPTO_BADMSG: > > + error = -EBADMSG; > > + break; > > + default: > > + error = -EIO; > > + break; > > + } > > + ablk_req = vc_req->ablkcipher_req; > > + /* Finish the encrypt or decrypt process */ > > + ablk_req->base.complete(&ablk_req->base, error); > > + } > > + > > + kfree(vc_req->req_data); > > + kfree(vc_req->sgs); > > + } > > + } while (!virtqueue_enable_cb(vq)); > > + spin_unlock_irqrestore(&vcrypto->lock, flags); > > +} > > + > > +static int virtcrypto_find_vqs(struct virtio_crypto *vi) > > +{ > > + vq_callback_t **callbacks; > > + struct virtqueue **vqs; > > + int ret = -ENOMEM; > > + int i, total_vqs; > > + const char **names; > > + > > + /* We expect 1 data virtqueue, followed by > > + * possible N-1 data queues used in multiqueue mode, followed by > > + * control vq. > > + */ > > + total_vqs = vi->max_data_queues + 1; > > + > > + /* Allocate space for find_vqs parameters */ > > + vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); > > + if (!vqs) > > + goto err_vq; > > + callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL); > > + if (!callbacks) > > + goto err_callback; > > + names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL); > > + if (!names) > > + goto err_names; > > + > > + /* Parameters for control virtqueue */ > > + callbacks[total_vqs - 1] = NULL; > > + names[total_vqs - 1] = "controlq"; > > + > > + /* Allocate/initialize parameters for data virtqueues */ > > + for (i = 0; i < vi->max_data_queues; i++) { > > + callbacks[i] = virtcrypto_dataq_callback; > > + snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name), > > + "dataq.%d", i); > > + names[i] = vi->data_vq[i].name; > > + } > > + > > + ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, > > + names); > > + if (ret) > > + goto err_find; > > + > > + vi->ctrl_vq = vqs[total_vqs - 1]; > > + > > + for (i = 0; i < vi->max_data_queues; i++) > > + vi->data_vq[i].vq = vqs[i]; > > + > > + kfree(names); > > + kfree(callbacks); > > + kfree(vqs); > > + > > + return 0; > > + > > +err_find: > > + kfree(names); > > +err_names: > > + kfree(callbacks); > > +err_callback: > > + kfree(vqs); > > +err_vq: > > + return ret; > > +} > > + > > +static int virtcrypto_alloc_queues(struct virtio_crypto *vi) > > +{ > > + vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq), > > + GFP_KERNEL); > > + if (!vi->data_vq) > > + return -ENOMEM; > > + > > + return 0; > > +} > > + > > +static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu) > > +{ > > + int i; > > + > > + if (vi->affinity_hint_set) { > > + for (i = 0; i < vi->max_data_queues; i++) > > + virtqueue_set_affinity(vi->data_vq[i].vq, -1); > > + > > + vi->affinity_hint_set = false; > > + } > > +} > > + > > +static void virtcrypto_set_affinity(struct virtio_crypto *vi) > > +{ > > + int i; > > + int cpu; > > + > > + /* > > + * In multiqueue mode, when the number of cpu is equal to the number > > + * of queue, we let the queue to be private to one cpu by > > + * setting the affinity hint to eliminate the contention. > > + */ > > + if (vi->curr_queue == 1 || > > + vi->max_data_queues != num_online_cpus()) { > > + virtcrypto_clean_affinity(vi, -1); > > + return; > > + } > > + > > So how can you handle cpu hotplug then? > I would imagine making max_data_queues > num_online_cpus > and initializing just the required number would be > a saner way. > It makes sense. > > + i = 0; > > + for_each_online_cpu(cpu) { > > + virtqueue_set_affinity(vi->data_vq[i].vq, cpu); > > + i++; > > + } > > + > > + vi->affinity_hint_set = true; > > +} > > + > > Above is racy in prsence of cpu hotplug. Is there a userspace > interface to fix up affinity after hotplug? Not yet. > If not you need to get notified after hotplug and > fix it up yourself. > I'll inspect it. > > +static void virtcrypto_free_queues(struct virtio_crypto *vi) > > +{ > > + kfree(vi->data_vq); > > +} > > + > > +static int virtcrypto_init_vqs(struct virtio_crypto *vi) > > +{ > > + int ret; > > + > > + /* Allocate send & receive queues */ > > + ret = virtcrypto_alloc_queues(vi); > > + if (ret) > > + goto err; > > + > > + ret = virtcrypto_find_vqs(vi); > > + if (ret) > > + goto err_free; > > + > > + get_online_cpus(); > > + virtcrypto_set_affinity(vi); > > + put_online_cpus(); > > + > > + return 0; > > + > > +err_free: > > + virtcrypto_free_queues(vi); > > +err: > > + return ret; > > +} > > + > > +static int virtcrypto_update_status(struct virtio_crypto *vcrypto) > > +{ > > + __le32 status_le; > > + u32 status; > > + int err; > > + > > + status_le = virtio_cread32_le(vcrypto->vdev, > > + offsetof(struct virtio_crypto_config, status)); > > + status = le32_to_cpu(status_le); > > + > > + /* Ignore unknown (future) status bits */ > > + status &= VIRTIO_CRYPTO_S_HW_READY; > > + > > + if (vcrypto->status == status) > > + return 0; > > + > > + vcrypto->status = status; > > + > > + if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) { > > + err = virtcrypto_dev_start(vcrypto); > > + if (err) { > > + dev_err(&vcrypto->vdev->dev, > > + "Failed to start virtio crypto device.\n"); > > + virtcrypto_dev_stop(vcrypto); > > + return -1; > > + } > > + dev_info(&vcrypto->vdev->dev, "Accelerator is ready\n"); > > + } else { > > + virtcrypto_dev_stop(vcrypto); > > + dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n"); > > + } > > + > > + return 0; > > +} > > + > > +static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto) > > +{ > > + struct virtio_device *vdev = vcrypto->vdev; > > + > > + virtcrypto_clean_affinity(vcrypto, -1); > > + > > + vdev->config->del_vqs(vdev); > > + > > + virtcrypto_free_queues(vcrypto); > > +} > > + > > +static int virtcrypto_probe(struct virtio_device *vdev) > > +{ > > + int err = -EFAULT; > > + struct virtio_crypto *vcrypto; > > + __le32 max_data_queues_le = 0, max_cipher_key_len_le = 0; > > + __le32 max_auth_key_len_le = 0; > > + __le64 max_size_le = 0; > > + > > Pls validate that it's a modern device (has VERSION_1 set). > We should find a way to do it in a central place, > but we don't have that now. > So what I will do is add a VERSION_1 feature bit checking at the beginning of the probe function: if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) return -ENODEV; > > + if (!vdev->config->get) { > > + dev_err(&vdev->dev, "%s failure: config access disabled\n", > > + __func__); > > + return -EINVAL; > > + } > > + > > + if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) { > > + /* > > + * If the accelerator is connected to a node with no memory > > + * there is no point in using the accelerator since the remote > > + * memory transaction will be very slow. > > + */ > > + dev_err(&vdev->dev, "Invalid NUMA configuration.\n"); > > + return -EINVAL; > > + } > > + > > + vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL, > > + dev_to_node(&vdev->dev)); > > + if (!vcrypto) > > + return -ENOMEM; > > + > > + max_data_queues_le = virtio_cread32_le(vdev, > > + offsetof(struct virtio_crypto_config, max_dataqueues)); > > + vcrypto->max_data_queues = le32_to_cpu(max_data_queues_le); > > + if (vcrypto->max_data_queues < 1) > > + vcrypto->max_data_queues = 1; > > + > > + dev_info(&vdev->dev, "max_queues: %u\n", vcrypto->max_data_queues); > > + > > + max_cipher_key_len_le = virtio_cread32_le(vdev, > > + offsetof(struct virtio_crypto_config, max_cipher_key_len)); > > + max_auth_key_len_le = virtio_cread32_le(vdev, > > + offsetof(struct virtio_crypto_config, max_auth_key_len)); > > + max_size_le = virtio_cread64_le(vdev, > > + offsetof(struct virtio_crypto_config, max_size)); > > + > > + /* Add virtio crypto device to global table */ > > + err = virtcrypto_devmgr_add_dev(vcrypto); > > + if (err) { > > + dev_err(&vdev->dev, "Failed to add new virtio crypto device.\n"); > > + goto free; > > + } > > + vcrypto->owner = THIS_MODULE; > > + vcrypto = vdev->priv = vcrypto; > > + vcrypto->vdev = vdev; > > + spin_lock_init(&vcrypto->lock); > > + spin_lock_init(&vcrypto->ctrl_lock); > > + > > + /* Use sigle data queue as default */ > > + vcrypto->curr_queue = 1; > > + vcrypto->max_cipher_key_len = le32_to_cpu(max_cipher_key_len_le); > > + vcrypto->max_auth_key_len = le32_to_cpu(max_auth_key_len_le); > > + vcrypto->max_size = le64_to_cpu(max_size_le); > > + > > + err = virtcrypto_init_vqs(vcrypto); > > + if (err) { > > + dev_err(&vdev->dev, "Failed to initialize vqs.\n"); > > + goto free_dev; > > + } > > + virtio_device_ready(vdev); > > + > > + err = virtcrypto_update_status(vcrypto); > > + if (err) { > > + err = -EFAULT; > > Why EFAULT? > I wanted to keep the same with err's initial value. Maybe I shouldn't change the err here but directly assign value in virtcrypto_update_status(). EPERM is better. > > + goto free_vqs; > > + } > > + > > + return 0; > > + > > +free_vqs: > > + virtcrypto_del_vqs(vcrypto); > > as you called virtio_device_ready this is likely unsafe > unless you first reset device or make sure there are > no interrupts in some other way. > Good catch. Will add reset operations. > > +free_dev: > > + virtcrypto_devmgr_rm_dev(vcrypto); > > +free: > > + kfree(vcrypto); > > + return err; > > +} > > + > > +static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto) > > +{ > > + struct virtio_crypto_request *vc_req; > > + int i; > > + struct virtqueue *vq; > > + > > + for (i = 0; i < vcrypto->max_data_queues; i++) { > > + vq = vcrypto->data_vq[i].vq; > > + while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) { > > + kfree(vc_req->req_data); > > + kfree(vc_req->sgs); > > + } > > + } > > +} > > + > > +static void virtcrypto_remove(struct virtio_device *vdev) > > +{ > > + struct virtio_crypto *vcrypto = vdev->priv; > > + > > + dev_info(&vdev->dev, "Start virtcrypto_remove.\n"); > > + > > + if (virtcrypto_dev_started(vcrypto)) > > + virtcrypto_dev_stop(vcrypto); > > + vdev->config->reset(vdev); > > + virtcrypto_free_unused_reqs(vcrypto); > > + virtcrypto_del_vqs(vcrypto); > > + virtcrypto_devmgr_rm_dev(vcrypto); > > + kfree(vcrypto); > > +} > > + > > +static void virtcrypto_config_changed(struct virtio_device *vdev) > > +{ > > + struct virtio_crypto *vcrypto = vdev->priv; > > + > > + virtcrypto_update_status(vcrypto); > > +} > > + > > +#ifdef CONFIG_PM_SLEEP > > +static int virtcrypto_freeze(struct virtio_device *vdev) > > +{ > > + struct virtio_crypto *vcrypto = vdev->priv; > > + unsigned long flags; > > + > > + virtcrypto_free_unused_reqs(vcrypto); > > + spin_lock_irqsave(&vcrypto->lock, flags); > > + if (virtcrypto_dev_started(vcrypto)) > > + virtcrypto_dev_stop(vcrypto); > > This is taking mutex locks under a spinlock. > Highly unlikely to work. Try this with lockdep > enabled. > Good catch, will do and inspect the necessity of the spin_lock here as well. > > > + spin_unlock_irqrestore(&vcrypto->lock, flags); > > + > > + virtcrypto_del_vqs(vcrypto); > > + return 0; > > +} > > + > > +static int virtcrypto_restore(struct virtio_device *vdev) > > +{ > > + struct virtio_crypto *vcrypto = vdev->priv; > > + int err; > > + > > + err = virtcrypto_init_vqs(vcrypto); > > + if (err) > > + return err; > > + > > + virtio_device_ready(vdev); > > + err = virtcrypto_dev_start(vcrypto); > > + if (err) { > > + dev_err(&vdev->dev, "Failed to start virtio crypto device.\n"); > > + return -EFAULT; > > + } > > + > > + return 0; > > +} > > +#endif > > + > > + > > +static unsigned int features[] = { > > + /* none */ > > +}; > > + > > +static struct virtio_device_id id_table[] = { > > + { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID }, > > + { 0 }, > > +}; > > + > > +static struct virtio_driver virtio_crypto_driver = { > > + .driver.name = KBUILD_MODNAME, > > + .driver.owner = THIS_MODULE, > > + .feature_table = features, > > + .feature_table_size = ARRAY_SIZE(features), > > + .id_table = id_table, > > + .probe = virtcrypto_probe, > > + .remove = virtcrypto_remove, > > + .config_changed = virtcrypto_config_changed, > > +#ifdef CONFIG_PM_SLEEP > > + .freeze = virtcrypto_freeze, > > + .restore = virtcrypto_restore, > > +#endif > > +}; > > + > > +module_virtio_driver(virtio_crypto_driver); > > + > > +MODULE_DEVICE_TABLE(virtio, id_table); > > +MODULE_DESCRIPTION("virtio crypto device driver"); > > +MODULE_LICENSE("GPL"); > > +MODULE_AUTHOR("Gonglei <arei.gonglei@xxxxxxxxxx>"); > > diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c > b/drivers/crypto/virtio/virtio_crypto_algs.c > > new file mode 100644 > > index 0000000..7b57584 > > --- /dev/null > > +++ b/drivers/crypto/virtio/virtio_crypto_algs.c > > @@ -0,0 +1,524 @@ > > + /* Algorithms supported by virtio crypto device > > + * > > + * Authors: Gonglei <arei.gonglei@xxxxxxxxxx> > > + * > > + * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD. > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License as published by > > + * the Free Software Foundation; either version 2 of the License, or > > + * (at your option) any later version. > > + * > > + * This program is distributed in the hope that it will be useful, > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > > + * GNU General Public License for more details. > > + * > > + * You should have received a copy of the GNU General Public License > > + * along with this program; if not, see <http://www.gnu.org/licenses/>. > > + */ > > + > > +#include <linux/scatterlist.h> > > +#include <crypto/algapi.h> > > +#include <linux/err.h> > > +#include <crypto/scatterwalk.h> > > +#include <linux/atomic.h> > > + > > +#include <uapi/linux/virtio_crypto.h> > > +#include "virtio_crypto_common.h" > > + > > +static DEFINE_MUTEX(algs_lock); > > +static unsigned int virtio_crypto_active_devs; > > + > > +static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg) > > +{ > > + u64 total = 0; > > + > > + for (total = 0; sg; sg = sg_next(sg)) > > + total += sg->length; > > + > > + return total; > > +} > > + > > +static int virtio_crypto_alg_validate_key(int key_len, int *alg) > > +{ > > + switch (key_len) { > > + case AES_KEYSIZE_128: > > + case AES_KEYSIZE_192: > > + case AES_KEYSIZE_256: > > + *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC; > > + break; > > + default: > > + return -EINVAL; > > + } > > + return 0; > > +} > > + > > +static int virtio_crypto_alg_ablkcipher_init_session( > > + struct virtio_crypto_ablkcipher_ctx *ctx, > > + int alg, const uint8_t *key, > > + unsigned int keylen, > > + 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; > > + unsigned int num_out = 0, num_in = 0; > > + > > + /* > > + * Avoid to do DMA from the stack, switch to using > > + * dynamically-allocated for the key > > + */ > > + uint8_t *cipher_key = kmalloc(keylen, GFP_ATOMIC); > > Is all crypto using GFP_ATOMIC like this? > Is there code that recovers if this fails? > The crypto subsystem has a flag named CRYPTO_TFM_REQ_MAY_SLEEP to decide to use GFP_KERENL or GFP_ATOMIC. We don't set the flag for virtio-crypto device, so I use GFP_ATOMIC likes qat_alg.c > > > + > > + if (!cipher_key) > > + return -ENOMEM; > > + > > + memcpy(cipher_key, key, keylen); > > + > > + spin_lock(&vcrypto->ctrl_lock); > > + /* Pad ctrl header */ > > + vcrypto->ctrl.header.opcode = > > + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION); > > + vcrypto->ctrl.header.algo = cpu_to_le32((uint32_t)alg); > > why cast here? > Will change the type of alg at the beginning of definition, remove the cast as well. > > + /* Set the default dataqueue id to 0 */ > > + vcrypto->ctrl.header.queue_id = 0; > > + > > + vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR); > > + /* Pad cipher's parameters */ > > + vcrypto->ctrl.u.sym_create_session.op_type = > > + cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); > > + vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo = > > + vcrypto->ctrl.header.algo; > > + vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen = > > + cpu_to_le32(keylen); > > + vcrypto->ctrl.u.sym_create_session.u.cipher.para.op = > > + cpu_to_le32(op); > > + > > + sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl)); > > + sgs[num_out++] = &outhdr; > > + > > + /* Set key */ > > + sg_init_one(&key_sg, cipher_key, keylen); > > + sgs[num_out++] = &key_sg; > > + > > + /* Return status and session id back */ > > + sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input)); > > + sgs[num_out + num_in++] = &inhdr; > > + > > + err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, > > + num_in, vcrypto, GFP_ATOMIC); > > + if (err < 0) { > > + spin_unlock(&vcrypto->ctrl_lock); > > + kfree(cipher_key); > > + return err; > > + } > > + virtqueue_kick(vcrypto->ctrl_vq); > > + > > + /* > > + * Spin for a response, the kick causes an ioport write, 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(); > > + > > + if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) { > > + spin_unlock(&vcrypto->ctrl_lock); > > + pr_err("virtio_crypto: Create session failed status: %u\n", > > + le32_to_cpu(vcrypto->input.status)); > > + kfree(cipher_key); > > + return -EINVAL; > > + } > > + spin_unlock(&vcrypto->ctrl_lock); > > + > > + spin_lock(&ctx->lock); > > + if (encrypt) > > + ctx->enc_sess_info.session_id = > > + le64_to_cpu(vcrypto->input.session_id); > > + else > > + ctx->dec_sess_info.session_id = > > + le64_to_cpu(vcrypto->input.session_id); > > + spin_unlock(&ctx->lock); > > + > > + kfree(cipher_key); > > + return 0; > > +} > > + > > +static int virtio_crypto_alg_ablkcipher_close_session( > > + struct virtio_crypto_ablkcipher_ctx *ctx, > > + 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; > > + unsigned int num_out = 0, num_in = 0; > > + > > + spin_lock(&vcrypto->ctrl_lock); > > + vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR; > > + /* Pad ctrl header */ > > + vcrypto->ctrl.header.opcode = > > + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION); > > + /* Set the default virtqueue id to 0 */ > > + vcrypto->ctrl.header.queue_id = 0; > > + > > + destroy_session = &vcrypto->ctrl.u.destroy_session; > > + > > + if (encrypt) > > + destroy_session->session_id = > > + cpu_to_le64(ctx->enc_sess_info.session_id); > > + else > > + destroy_session->session_id = > > + cpu_to_le64(ctx->dec_sess_info.session_id); > > + > > + sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl)); > > + sgs[num_out++] = &outhdr; > > + > > + /* Return status and session id back */ > > + sg_init_one(&status_sg, &vcrypto->ctrl_status.status, > > + sizeof(vcrypto->ctrl_status.status)); > > + sgs[num_out + num_in++] = &status_sg; > > + > > + err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, > > + num_in, vcrypto, GFP_ATOMIC); > > + if (err < 0) { > > + spin_unlock(&vcrypto->ctrl_lock); > > + return err; > > + } > > + virtqueue_kick(vcrypto->ctrl_vq); > > + > > + while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) && > > + !virtqueue_is_broken(vcrypto->ctrl_vq)) > > + cpu_relax(); > > + > > + if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) { > > + spin_unlock(&vcrypto->ctrl_lock); > > + pr_err("virtio_crypto: Close session failed status: %u, session_id: > 0x%llx\n", > > + vcrypto->ctrl_status.status, > > + destroy_session->session_id); > > + > > + return -EINVAL; > > + } > > + spin_unlock(&vcrypto->ctrl_lock); > > + > > + return 0; > > +} > > + > > +static int virtio_crypto_alg_ablkcipher_init_sessions( > > + struct virtio_crypto_ablkcipher_ctx *ctx, > > + const uint8_t *key, unsigned int keylen) > > +{ > > + int alg; > > + int ret; > > + struct virtio_crypto *vcrypto = ctx->vcrypto; > > + > > + if (keylen > vcrypto->max_cipher_key_len) { > > + pr_err("virtio_crypto: the key is too long\n"); > > + goto bad_key; > > + } > > + > > + if (virtio_crypto_alg_validate_key(keylen, &alg)) > > + goto bad_key; > > + > > + /* Create encryption session */ > > + ret = virtio_crypto_alg_ablkcipher_init_session(ctx, > > + alg, key, keylen, 1); > > + if (ret) > > + return ret; > > + /* Create decryption session */ > > + ret = virtio_crypto_alg_ablkcipher_init_session(ctx, > > + alg, key, keylen, 0); > > + if (ret) { > > + virtio_crypto_alg_ablkcipher_close_session(ctx, 1); > > + return ret; > > + } > > + return 0; > > + > > +bad_key: > > + crypto_tfm_set_flags(ctx->tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); > > + return -EINVAL; > > +} > > + > > +/* Note: kernel crypto API realization */ > > +static int virtio_crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm, > > + const uint8_t *key, > > + unsigned int keylen) > > +{ > > + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(tfm); > > + int ret; > > + > > + spin_lock(&ctx->lock); > > + > > + if (!ctx->vcrypto) { > > + /* New key */ > > + int node = virtio_crypto_get_current_node(); > > + struct virtio_crypto *vcrypto = > > + virtcrypto_get_dev_node(node); > > + if (!vcrypto) { > > + vcrypto = virtcrypto_devmgr_get_first(); > > + if (!vcrypto) { > > + pr_err("virtio_crypto: Could not find a virtio device in the > system"); > > + spin_unlock(&ctx->lock); > > + return -ENODEV; > > + } > > + } > > + > > + ctx->vcrypto = vcrypto; > > + } > > + spin_unlock(&ctx->lock); > > + > > + ret = virtio_crypto_alg_ablkcipher_init_sessions(ctx, key, keylen); > > + if (ret) { > > + virtcrypto_dev_put(ctx->vcrypto); > > + ctx->vcrypto = NULL; > > + > > + return ret; > > + } > > + > > + return 0; > > +} > > + > > +static int > > +__virtio_crypto_ablkcipher_do_req(struct virtio_crypto_request *vc_req, > > + struct ablkcipher_request *req, > > + struct data_queue *data_vq, > > + __u8 op) > > +{ > > + struct virtio_crypto_ablkcipher_ctx *ctx = vc_req->ablkcipher_ctx; > > + struct virtio_crypto *vcrypto = ctx->vcrypto; > > + struct virtio_crypto_op_data_req *req_data; > > + int src_nents, dst_nents; > > + int err; > > + unsigned long flags; > > + struct scatterlist outhdr, iv_sg, status_sg, **sgs; > > + int i; > > + u64 dst_len; > > + unsigned int num_out = 0, num_in = 0; > > + int sg_total; > > + > > + src_nents = sg_nents_for_len(req->src, req->nbytes); > > + dst_nents = sg_nents(req->dst); > > + > > + pr_debug("virtio_crypto: Number of sgs (src_nents: %d, > dst_nents: %d)\n", > > + src_nents, dst_nents); > > + > > + /* Why 3? outhdr + iv + inhdr */ > > + sg_total = src_nents + dst_nents + 3; > > + sgs = kzalloc_node(sg_total * sizeof(*sgs), GFP_ATOMIC, > > + dev_to_node(&vcrypto->vdev->dev)); > > + if (!sgs) > > + return -ENOMEM; > > + > > + req_data = kzalloc_node(sizeof(*req_data), GFP_ATOMIC, > > + dev_to_node(&vcrypto->vdev->dev)); > > + if (!req_data) { > > + kfree(sgs); > > + return -ENOMEM; > > + } > > + > > + vc_req->req_data = req_data; > > + vc_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER; > > + /* Head of operation */ > > + if (op) { > > + req_data->header.session_id = > > + cpu_to_le64(ctx->enc_sess_info.session_id); > > + req_data->header.opcode = > > + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT); > > + } else { > > + req_data->header.session_id = > > + cpu_to_le64(ctx->dec_sess_info.session_id); > > + req_data->header.opcode = > > + cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT); > > + } > > + req_data->u.sym_req.op_type = > cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); > > + req_data->u.sym_req.u.cipher.para.iv_len = > cpu_to_le32(AES_BLOCK_SIZE); > > + req_data->u.sym_req.u.cipher.para.src_data_len = > > + cpu_to_le32(req->nbytes); > > + > > + dst_len = virtio_crypto_alg_sg_nents_length(req->dst); > > + if (unlikely(dst_len > U32_MAX)) { > > + pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n"); > > + err = -EINVAL; > > + goto free; > > + } > > + > > + pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n", > > + req->nbytes, dst_len); > > + > > + if (unlikely(req->nbytes + dst_len + AES_BLOCK_SIZE + > > + sizeof(vc_req->status) > vcrypto->max_size)) { > > + pr_err("virtio_crypto: The length is too big\n"); > > + err = -EINVAL; > > + goto free; > > + } > > + > > + req_data->u.sym_req.u.cipher.para.dst_data_len = > > + cpu_to_le32((uint32_t)dst_len); > > + > > + /* Outhdr */ > > + sg_init_one(&outhdr, req_data, sizeof(*req_data)); > > + sgs[num_out++] = &outhdr; > > + > > + /* IV */ > > + sg_init_one(&iv_sg, req->info, AES_BLOCK_SIZE); > > + sgs[num_out++] = &iv_sg; > > + > > + /* Source data */ > > + for (i = 0; i < src_nents; i++) > > + sgs[num_out++] = &req->src[i]; > > + > > + /* Destination data */ > > + for (i = 0; i < dst_nents; i++) > > + sgs[num_out + num_in++] = &req->dst[i]; > > + > > + /* Status */ > > + sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status)); > > + sgs[num_out + num_in++] = &status_sg; > > + > > + vc_req->sgs = sgs; > > + > > + spin_lock_irqsave(&vcrypto->lock, flags); > > + err = virtqueue_add_sgs(data_vq->vq, sgs, num_out, > > + num_in, vc_req, GFP_ATOMIC); > > + spin_unlock_irqrestore(&vcrypto->lock, flags); > > + if (unlikely(err < 0)) > > + goto free; > > + > > + return 0; > > + > > +free: > > + kfree(req_data); > > + kfree(sgs); > > + return err; > > +} > > + > > +static int virtio_crypto_ablkcipher_encrypt(struct ablkcipher_request *req) > > +{ > > + struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req); > > + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm); > > + struct virtio_crypto_request *vc_req = ablkcipher_request_ctx(req); > > + struct virtio_crypto *vcrypto = ctx->vcrypto; > > + int ret; > > + /* Use the first data virtqueue as default */ > > + struct data_queue *data_vq = &vcrypto->data_vq[0]; > > + > > + vc_req->ablkcipher_ctx = ctx; > > + vc_req->ablkcipher_req = req; > > + ret = __virtio_crypto_ablkcipher_do_req(vc_req, req, data_vq, 1); > > + if (ret < 0) { > > + pr_err("virtio_crypto: Encryption failed!\n"); > > + return ret; > > + } > > + virtqueue_kick(data_vq->vq); > > + > > + return -EINPROGRESS; > > +} > > + > > +static int virtio_crypto_ablkcipher_decrypt(struct ablkcipher_request *req) > > +{ > > + struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req); > > + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm); > > + struct virtio_crypto_request *vc_req = ablkcipher_request_ctx(req); > > + struct virtio_crypto *vcrypto = ctx->vcrypto; > > + int ret; > > + /* Use the first data virtqueue as default */ > > + struct data_queue *data_vq = &vcrypto->data_vq[0]; > > + > > + vc_req->ablkcipher_ctx = ctx; > > + vc_req->ablkcipher_req = req; > > + > > + ret = __virtio_crypto_ablkcipher_do_req(vc_req, req, data_vq, 0); > > + if (ret < 0) { > > + pr_err("virtio_crypto: Decryption failed!\n"); > > + return ret; > > + } > > + virtqueue_kick(data_vq->vq); > > + > > + return -EINPROGRESS; > > +} > > + > > +static int virtio_crypto_ablkcipher_init(struct crypto_tfm *tfm) > > +{ > > + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm); > > + > > + spin_lock_init(&ctx->lock); > > + tfm->crt_ablkcipher.reqsize = sizeof(struct virtio_crypto_request); > > + ctx->tfm = tfm; > > + > > + return 0; > > +} > > + > > +static void virtio_crypto_ablkcipher_exit(struct crypto_tfm *tfm) > > +{ > > + struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm); > > + > > + if (!ctx->vcrypto) > > + return; > > + > > + virtio_crypto_alg_ablkcipher_close_session(ctx, 1); > > + virtio_crypto_alg_ablkcipher_close_session(ctx, 0); > > + virtcrypto_dev_put(ctx->vcrypto); > > + ctx->vcrypto = NULL; > > +} > > + > > +static struct crypto_alg virtio_crypto_algs[] = { { > > + .cra_name = "cbc(aes)", > > + .cra_driver_name = "virtio_crypto_aes_cbc", > > + .cra_priority = 4001, > > + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, > > + .cra_blocksize = AES_BLOCK_SIZE, > > + .cra_ctxsize = sizeof(struct virtio_crypto_ablkcipher_ctx), > > + .cra_alignmask = 0, > > + .cra_module = THIS_MODULE, > > + .cra_type = &crypto_ablkcipher_type, > > + .cra_init = virtio_crypto_ablkcipher_init, > > + .cra_exit = virtio_crypto_ablkcipher_exit, > > + .cra_u = { > > + .ablkcipher = { > > + .setkey = virtio_crypto_ablkcipher_setkey, > > + .decrypt = virtio_crypto_ablkcipher_decrypt, > > + .encrypt = virtio_crypto_ablkcipher_encrypt, > > + .min_keysize = AES_MIN_KEY_SIZE, > > + .max_keysize = AES_MAX_KEY_SIZE, > > + .ivsize = AES_BLOCK_SIZE, > > + }, > > + }, > > +} }; > > + > > +int virtio_crypto_algs_register(void) > > +{ > > + int ret = 0, i; > > + > > + mutex_lock(&algs_lock); > > + if (++virtio_crypto_active_devs != 1) > > + goto unlock; > > + > > + for (i = 0; i < ARRAY_SIZE(virtio_crypto_algs); i++) { > > + virtio_crypto_algs[i].cra_flags = > > + CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC; > > + } > > + > > + ret = crypto_register_algs(virtio_crypto_algs, > > + ARRAY_SIZE(virtio_crypto_algs)); > > + > > +unlock: > > + mutex_unlock(&algs_lock); > > + return ret; > > +} > > + > > +void virtio_crypto_algs_unregister(void) > > +{ > > + mutex_lock(&algs_lock); > > + if (--virtio_crypto_active_devs != 0) > > + goto unlock; > > + > > + crypto_unregister_algs(virtio_crypto_algs, > > + ARRAY_SIZE(virtio_crypto_algs)); > > + > > +unlock: > > + mutex_unlock(&algs_lock); > > +} > > diff --git a/drivers/crypto/virtio/virtio_crypto_common.h > b/drivers/crypto/virtio/virtio_crypto_common.h > > new file mode 100644 > > index 0000000..a599733 > > --- /dev/null > > +++ b/drivers/crypto/virtio/virtio_crypto_common.h > > @@ -0,0 +1,124 @@ > > +/* Common header for Virtio crypto device. > > + * > > + * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD. > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License as published by > > + * the Free Software Foundation; either version 2 of the License, or > > + * (at your option) any later version. > > + * > > + * This program is distributed in the hope that it will be useful, > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > > + * GNU General Public License for more details. > > + * > > + * You should have received a copy of the GNU General Public License > > + * along with this program; if not, see <http://www.gnu.org/licenses/>. > > + */ > > + > > +#ifndef _VIRITO_CRYPTO_COMMON_H > > +#define _VIRITO_CRYPTO_COMMON_H > > + > > +#include <linux/virtio.h> > > +#include <linux/crypto.h> > > +#include <linux/spinlock.h> > > +#include <crypto/aead.h> > > +#include <crypto/aes.h> > > +#include <crypto/authenc.h> > > + > > + > > +/* Internal representation of a data virtqueue */ > > +struct data_queue { > > + /* Virtqueue associated with this send _queue */ > > + struct virtqueue *vq; > > + > > + /* Name of the tx queue: dataq.$index */ > > + char name[32]; > > +}; > > + > > +struct virtio_crypto { > > + struct virtio_device *vdev; > > + struct virtqueue *ctrl_vq; > > + struct data_queue *data_vq; > > + > > + /* To protect the vq operations for the dataq */ > > + spinlock_t lock; > > + > > + /* To protect the vq operations for the controlq */ > > + spinlock_t ctrl_lock; > > + > > + /* Maximum of data queues supported by the device */ > > + u32 max_data_queues; > > + > > + /* Number of queue currently used by the driver */ > > + u32 curr_queue; > > + > > + /* Maximum length of cipher key */ > > + u32 max_cipher_key_len; > > + /* Maximum length of authenticated key */ > > + u32 max_auth_key_len; > > + /* Maximum size of per request */ > > + u64 max_size; > > + > > + /* Control VQ buffers: protected by the ctrl_lock */ > > + struct virtio_crypto_op_ctrl_req ctrl; > > + struct virtio_crypto_session_input input; > > + struct virtio_crypto_inhdr ctrl_status; > > + > > + unsigned long status; > > + atomic_t ref_count; > > + struct list_head list; > > + struct module *owner; > > + uint8_t dev_id; > > + > > + /* Does the affinity hint is set for virtqueues? */ > > + bool affinity_hint_set; > > +}; > > + > > +struct virtio_crypto_sym_session_info { > > + /* Backend session id, which come from the host side */ > > + __u64 session_id; > > +}; > > + > > +struct virtio_crypto_ablkcipher_ctx { > > + struct virtio_crypto *vcrypto; > > + struct crypto_tfm *tfm; > > + > > + struct virtio_crypto_sym_session_info enc_sess_info; > > + struct virtio_crypto_sym_session_info dec_sess_info; > > + > > + /* Protects virtio_crypto_ablkcipher_ctx struct */ > > + spinlock_t lock; > > +}; > > + > > +struct virtio_crypto_request { > > + /* Cipher or aead */ > > + uint32_t type; > > + uint8_t status; > > + struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx; > > + struct ablkcipher_request *ablkcipher_req; > > + struct virtio_crypto_op_data_req *req_data; > > + struct scatterlist **sgs; > > +}; > > + > > +int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev); > > +struct list_head *virtcrypto_devmgr_get_head(void); > > +void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev); > > +struct virtio_crypto *virtcrypto_devmgr_get_first(void); > > +int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev); > > +int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev); > > +void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev); > > +int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev); > > +struct virtio_crypto *virtcrypto_get_dev_node(int node); > > +int virtcrypto_dev_start(struct virtio_crypto *vcrypto); > > +void virtcrypto_dev_stop(struct virtio_crypto *vcrypto); > > + > > +static inline int virtio_crypto_get_current_node(void) > > +{ > > + return topology_physical_package_id(smp_processor_id()); > > +} > > + > > +int virtio_crypto_algs_register(void); > > +void virtio_crypto_algs_unregister(void); > > + > > +#endif /* _VIRITO_CRYPTO_COMMON_H */ > > diff --git a/drivers/crypto/virtio/virtio_crypto_mgr.c > b/drivers/crypto/virtio/virtio_crypto_mgr.c > > new file mode 100644 > > index 0000000..5b7260c > > --- /dev/null > > +++ b/drivers/crypto/virtio/virtio_crypto_mgr.c > > @@ -0,0 +1,258 @@ > > + /* Management for virtio crypto devices (refer to adf_dev_mgr.c) > > + * > > + * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD. > > + * > > + * This program is free software; you can redistribute it and/or modify > > + * it under the terms of the GNU General Public License as published by > > + * the Free Software Foundation; either version 2 of the License, or > > + * (at your option) any later version. > > + * > > + * This program is distributed in the hope that it will be useful, > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > > + * GNU General Public License for more details. > > + * > > + * You should have received a copy of the GNU General Public License > > + * along with this program; if not, see <http://www.gnu.org/licenses/>. > > + */ > > + > > +#include <linux/mutex.h> > > +#include <linux/list.h> > > +#include <linux/module.h> > > + > > +#include <uapi/linux/virtio_crypto.h> > > +#include "virtio_crypto_common.h" > > + > > +static LIST_HEAD(virtio_crypto_table); > > +static DEFINE_MUTEX(table_lock); > > +static uint32_t num_devices; > > + > > +#define VIRTIO_CRYPTO_MAX_DEVICES 32 > > + > > + > > +/* > > + * virtcrypto_devmgr_add_dev() - Add vcrypto_dev to the acceleration > > + * framework. > > + * @vcrypto_dev: Pointer to virtio crypto device. > > + * > > + * Function adds virtio crypto device to the global list. > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: 0 on success, error code othewise. > > + */ > > +int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev) > > +{ > > + struct list_head *itr; > > + > > + if (num_devices == VIRTIO_CRYPTO_MAX_DEVICES) { > > + pr_info("virtio_crypto: only support up to %d devices\n", > > + VIRTIO_CRYPTO_MAX_DEVICES); > > + return -EFAULT; > > + } > > + > > + mutex_lock(&table_lock); > > + list_for_each(itr, &virtio_crypto_table) { > > + struct virtio_crypto *ptr = > > + list_entry(itr, struct virtio_crypto, list); > > + > > + if (ptr == vcrypto_dev) { > > + mutex_unlock(&table_lock); > > + return -EEXIST; > > + } > > + } > > + atomic_set(&vcrypto_dev->ref_count, 0); > > + list_add_tail(&vcrypto_dev->list, &virtio_crypto_table); > > + vcrypto_dev->dev_id = num_devices++; > > + mutex_unlock(&table_lock); > > + return 0; > > +} > > + > > +struct list_head *virtcrypto_devmgr_get_head(void) > > +{ > > + return &virtio_crypto_table; > > +} > > + > > +/* > > + * virtcrypto_devmgr_rm_dev() - Remove vcrypto_dev from the acceleration > > + * framework. > > + * @vcrypto_dev: Pointer to virtio crypto device. > > + * > > + * Function removes virtio crypto device from the acceleration framework. > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: void > > + */ > > +void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev) > > +{ > > + mutex_lock(&table_lock); > > + list_del(&vcrypto_dev->list); > > + num_devices--; > > + mutex_unlock(&table_lock); > > +} > > + > > +/* > > + * virtcrypto_devmgr_get_first() > > + * > > + * Function returns the first virtio crypto device from the acceleration > > + * framework. > > + * > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: pointer to vcrypto_dev or NULL if not found. > > + */ > > +struct virtio_crypto *virtcrypto_devmgr_get_first(void) > > +{ > > + struct virtio_crypto *dev = NULL; > > + > > + if (!list_empty(&virtio_crypto_table)) > > + dev = list_first_entry(&virtio_crypto_table, > > + struct virtio_crypto, > > + list); > > + return dev; > > +} > > + > > +/* > > + * virtcrypto_dev_in_use() - Check whether vcrypto_dev is currently in use > > + * @vcrypto_dev: Pointer to virtio crypto device. > > + * > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: 1 when device is in use, 0 otherwise. > > + */ > > +int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev) > > +{ > > + return atomic_read(&vcrypto_dev->ref_count) != 0; > > +} > > + > > +/* > > + * virtcrypto_dev_get() - Increment vcrypto_dev reference count > > + * @vcrypto_dev: Pointer to virtio crypto device. > > + * > > + * Increment the vcrypto_dev refcount and if this is the first time > > + * incrementing it during this period the vcrypto_dev is in use, > > + * increment the module refcount too. > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: 0 when successful, EFAULT when fail to bump module refcount > > + */ > > +int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev) > > +{ > > + if (atomic_add_return(1, &vcrypto_dev->ref_count) == 1) > > + if (!try_module_get(vcrypto_dev->owner)) > > + return -EFAULT; > > + return 0; > > +} > > + > > +/* > > + * virtcrypto_dev_put() - Decrement vcrypto_dev reference count > > + * @vcrypto_dev: Pointer to virtio crypto device. > > + * > > + * Decrement the vcrypto_dev refcount and if this is the last time > > + * decrementing it during this period the vcrypto_dev is in use, > > + * decrement the module refcount too. > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: void > > + */ > > +void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev) > > +{ > > + if (atomic_sub_return(1, &vcrypto_dev->ref_count) == 0) > > + module_put(vcrypto_dev->owner); > > +} > > + > > +/* > > + * virtcrypto_dev_started() - Check whether device has started > > + * @vcrypto_dev: Pointer to virtio crypto device. > > + * > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: 1 when the device has started, 0 otherwise > > + */ > > +int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev) > > +{ > > + return (vcrypto_dev->status & VIRTIO_CRYPTO_S_HW_READY); > > +} > > + > > +/* > > + * virtcrypto_get_dev_node() - Get vcrypto_dev on the node. > > + * @node: Node id the driver works. > > + * > > + * Function returns the virtio crypto device used fewest on the node. > > + * > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: pointer to vcrypto_dev or NULL if not found. > > + */ > > +struct virtio_crypto *virtcrypto_get_dev_node(int node) > > +{ > > + struct virtio_crypto *vcrypto_dev = NULL, *tmp_dev; > > + unsigned long best = ~0; > > + unsigned long ctr; > > + > > + list_for_each_entry(tmp_dev, virtcrypto_devmgr_get_head(), list) { > > + > > + if ((node == dev_to_node(&tmp_dev->vdev->dev) || > > + dev_to_node(&tmp_dev->vdev->dev) < 0) && > > + virtcrypto_dev_started(tmp_dev)) { > > + ctr = atomic_read(&tmp_dev->ref_count); > > + if (best > ctr) { > > + vcrypto_dev = tmp_dev; > > + best = ctr; > > + } > > + } > > + } > > + > > + if (!vcrypto_dev) { > > + pr_info("virtio_crypto: Could not find a device on node %d\n", > > + node); > > + /* Get any started device */ > > + list_for_each_entry(tmp_dev, > > + virtcrypto_devmgr_get_head(), list) { > > + if (virtcrypto_dev_started(tmp_dev)) { > > + vcrypto_dev = tmp_dev; > > + break; > > + } > > + } > > + } > > + > > + if (!vcrypto_dev) > > + return NULL; > > + > > + virtcrypto_dev_get(vcrypto_dev); > > + return vcrypto_dev; > > +} > > + > > +/* > > + * virtcrypto_dev_start() - Start virtio crypto device > > + * @vcrypto: Pointer to virtio crypto device. > > + * > > + * Function notifies all the registered services that the virtio crypto device > > + * is ready to be used. > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: 0 on success, EFAULT when fail to register algorithms > > + */ > > +int virtcrypto_dev_start(struct virtio_crypto *vcrypto) > > +{ > > + if (virtio_crypto_algs_register()) { > > + pr_err("virtio_crypto: Failed to register crypto algs\n"); > > + return -EFAULT; > > + } > > + > > + return 0; > > +} > > + > > +/* > > + * virtcrypto_dev_stop() - Stop virtio crypto device > > + * @vcrypto: Pointer to virtio crypto device. > > + * > > + * Function notifies all the registered services that the virtio crypto device > > + * is ready to be used. > > + * To be used by virtio crypto device specific drivers. > > + * > > + * Return: void > > + */ > > +void virtcrypto_dev_stop(struct virtio_crypto *vcrypto) > > +{ > > + virtio_crypto_algs_unregister(); > > +} > > diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild > > index cd2be1c..4bdb84c 100644 > > --- a/include/uapi/linux/Kbuild > > +++ b/include/uapi/linux/Kbuild > > @@ -460,6 +460,7 @@ header-y += virtio_rng.h > > header-y += virtio_scsi.h > > header-y += virtio_types.h > > header-y += virtio_vsock.h > > +header-y += virtio_crypto.h > > header-y += vm_sockets.h > > header-y += vt.h > > header-y += vtpm_proxy.h > > diff --git a/include/uapi/linux/virtio_crypto.h > b/include/uapi/linux/virtio_crypto.h > > new file mode 100644 > > index 0000000..abc2cf5 > > --- /dev/null > > +++ b/include/uapi/linux/virtio_crypto.h > > @@ -0,0 +1,435 @@ > > +#ifndef _VIRTIO_CRYPTO_H > > +#define _VIRTIO_CRYPTO_H > > +/* This header is BSD licensed so anyone can use the definitions to > implement > > + * compatible drivers/servers. > > + * > > + * Redistribution and use in source and binary forms, with or without > > + * modification, are permitted provided that the following conditions > > + * are met: > > + * 1. Redistributions of source code must retain the above copyright > > + * notice, this list of conditions and the following disclaimer. > > + * 2. Redistributions in binary form must reproduce the above copyright > > + * notice, this list of conditions and the following disclaimer in the > > + * documentation and/or other materials provided with the distribution. > > + * 3. Neither the name of IBM nor the names of its contributors > > + * may be used to endorse or promote products derived from this > software > > + * without specific prior written permission. > > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND > CONTRIBUTORS > > + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT > NOT > > + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND > FITNESS > > + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL > IBM OR > > + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, > > + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT > NOT > > + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS > OF > > + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER > CAUSED AND > > + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT > LIABILITY, > > + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY > WAY OUT > > + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF > > + * SUCH DAMAGE. > > + */ > > +#include <linux/types.h> > > +#include <linux/virtio_types.h> > > +#include <linux/virtio_ids.h> > > +#include <linux/virtio_config.h> > > + > > + > > +#define VIRTIO_CRYPTO_SERVICE_CIPHER 0 > > +#define VIRTIO_CRYPTO_SERVICE_HASH 1 > > +#define VIRTIO_CRYPTO_SERVICE_MAC 2 > > +#define VIRTIO_CRYPTO_SERVICE_AEAD 3 > > + > > +#define VIRTIO_CRYPTO_OPCODE(service, op) (((service) << 8) | (op)) > > + > > +struct virtio_crypto_ctrl_header { > > +#define VIRTIO_CRYPTO_CIPHER_CREATE_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x02) > > +#define VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x03) > > +#define VIRTIO_CRYPTO_HASH_CREATE_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x02) > > +#define VIRTIO_CRYPTO_HASH_DESTROY_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x03) > > +#define VIRTIO_CRYPTO_MAC_CREATE_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x02) > > +#define VIRTIO_CRYPTO_MAC_DESTROY_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x03) > > +#define VIRTIO_CRYPTO_AEAD_CREATE_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x02) > > +#define VIRTIO_CRYPTO_AEAD_DESTROY_SESSION \ > > + VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x03) > > + __le32 opcode; > > + __le32 algo; > > + __le32 flag; > > + /* data virtqueue id */ > > + __le32 queue_id; > > +}; > > + > > +struct virtio_crypto_cipher_session_para { > > +#define VIRTIO_CRYPTO_NO_CIPHER 0 > > +#define VIRTIO_CRYPTO_CIPHER_ARC4 1 > > +#define VIRTIO_CRYPTO_CIPHER_AES_ECB 2 > > +#define VIRTIO_CRYPTO_CIPHER_AES_CBC 3 > > +#define VIRTIO_CRYPTO_CIPHER_AES_CTR 4 > > +#define VIRTIO_CRYPTO_CIPHER_DES_ECB 5 > > +#define VIRTIO_CRYPTO_CIPHER_DES_CBC 6 > > +#define VIRTIO_CRYPTO_CIPHER_3DES_ECB 7 > > +#define VIRTIO_CRYPTO_CIPHER_3DES_CBC 8 > > +#define VIRTIO_CRYPTO_CIPHER_3DES_CTR 9 > > +#define VIRTIO_CRYPTO_CIPHER_KASUMI_F8 10 > > +#define VIRTIO_CRYPTO_CIPHER_SNOW3G_UEA2 11 > > +#define VIRTIO_CRYPTO_CIPHER_AES_F8 12 > > +#define VIRTIO_CRYPTO_CIPHER_AES_XTS 13 > > +#define VIRTIO_CRYPTO_CIPHER_ZUC_EEA3 14 > > + __le32 algo; > > + /* length of key */ > > + __le32 keylen; > > + > > +#define VIRTIO_CRYPTO_OP_ENCRYPT 1 > > +#define VIRTIO_CRYPTO_OP_DECRYPT 2 > > + /* encrypt or decrypt */ > > + __le32 op; > > + __le32 padding; > > +}; > > + > > +struct virtio_crypto_session_input { > > + /* Device-writable part */ > > + __le64 session_id; > > + __le32 status; > > + __le32 padding; > > +}; > > + > > +struct virtio_crypto_cipher_session_req { > > + struct virtio_crypto_cipher_session_para para; > > +}; > > + > > +struct virtio_crypto_hash_session_para { > > +#define VIRTIO_CRYPTO_NO_HASH 0 > > +#define VIRTIO_CRYPTO_HASH_MD5 1 > > +#define VIRTIO_CRYPTO_HASH_SHA1 2 > > +#define VIRTIO_CRYPTO_HASH_SHA_224 3 > > +#define VIRTIO_CRYPTO_HASH_SHA_256 4 > > +#define VIRTIO_CRYPTO_HASH_SHA_384 5 > > +#define VIRTIO_CRYPTO_HASH_SHA_512 6 > > +#define VIRTIO_CRYPTO_HASH_SHA3_224 7 > > +#define VIRTIO_CRYPTO_HASH_SHA3_256 8 > > +#define VIRTIO_CRYPTO_HASH_SHA3_384 9 > > +#define VIRTIO_CRYPTO_HASH_SHA3_512 10 > > +#define VIRTIO_CRYPTO_HASH_SHA3_SHAKE128 11 > > +#define VIRTIO_CRYPTO_HASH_SHA3_SHAKE256 12 > > + __le32 algo; > > + /* hash result length */ > > + __le32 hash_result_len; > > +}; > > + > > +struct virtio_crypto_hash_create_session_req { > > + struct virtio_crypto_hash_session_para para; > > +}; > > + > > +struct virtio_crypto_mac_session_para { > > +#define VIRTIO_CRYPTO_NO_MAC 0 > > +#define VIRTIO_CRYPTO_MAC_HMAC_MD5 1 > > +#define VIRTIO_CRYPTO_MAC_HMAC_SHA1 2 > > +#define VIRTIO_CRYPTO_MAC_HMAC_SHA_224 3 > > +#define VIRTIO_CRYPTO_MAC_HMAC_SHA_256 4 > > +#define VIRTIO_CRYPTO_MAC_HMAC_SHA_384 5 > > +#define VIRTIO_CRYPTO_MAC_HMAC_SHA_512 6 > > +#define VIRTIO_CRYPTO_MAC_CMAC_3DES 25 > > +#define VIRTIO_CRYPTO_MAC_CMAC_AES 26 > > +#define VIRTIO_CRYPTO_MAC_KASUMI_F9 27 > > +#define VIRTIO_CRYPTO_MAC_SNOW3G_UIA2 28 > > +#define VIRTIO_CRYPTO_MAC_GMAC_AES 41 > > +#define VIRTIO_CRYPTO_MAC_GMAC_TWOFISH 42 > > +#define VIRTIO_CRYPTO_MAC_CBCMAC_AES 49 > > +#define VIRTIO_CRYPTO_MAC_CBCMAC_KASUMI_F9 50 > > +#define VIRTIO_CRYPTO_MAC_XCBC_AES 53 > > + __le32 algo; > > + /* hash result length */ > > + __le32 hash_result_len; > > + /* length of authenticated key */ > > + __le32 auth_key_len; > > + __le32 padding; > > +}; > > + > > +struct virtio_crypto_mac_create_session_req { > > + struct virtio_crypto_mac_session_para para; > > +}; > > + > > +struct virtio_crypto_aead_session_para { > > +#define VIRTIO_CRYPTO_NO_AEAD 0 > > +#define VIRTIO_CRYPTO_AEAD_GCM 1 > > +#define VIRTIO_CRYPTO_AEAD_CCM 2 > > +#define VIRTIO_CRYPTO_AEAD_CHACHA20_POLY1305 3 > > + __le32 algo; > > + /* length of key */ > > + __le32 key_len; > > + /* hash result length */ > > + __le32 hash_result_len; > > + /* length of the additional authenticated data (AAD) in bytes */ > > + __le32 aad_len; > > + /* encrypt or decrypt, See above VIRTIO_CRYPTO_OP_* */ > > + __le32 op; > > + __le32 padding; > > +}; > > + > > +struct virtio_crypto_aead_create_session_req { > > + struct virtio_crypto_aead_session_para para; > > +}; > > + > > +struct virtio_crypto_alg_chain_session_para { > > +#define VIRTIO_CRYPTO_SYM_ALG_CHAIN_ORDER_HASH_THEN_CIPHER > 1 > > +#define VIRTIO_CRYPTO_SYM_ALG_CHAIN_ORDER_CIPHER_THEN_HASH > 2 > > + __le32 alg_chain_order; > > +/* Plain hash */ > > +#define VIRTIO_CRYPTO_SYM_HASH_MODE_PLAIN 1 > > +/* Authenticated hash (mac) */ > > +#define VIRTIO_CRYPTO_SYM_HASH_MODE_AUTH 2 > > +/* Nested hash */ > > +#define VIRTIO_CRYPTO_SYM_HASH_MODE_NESTED 3 > > + __le32 hash_mode; > > + struct virtio_crypto_cipher_session_para cipher_param; > > + union { > > + struct virtio_crypto_hash_session_para hash_param; > > + struct virtio_crypto_mac_session_para mac_param; > > + } u; > > I personally dislike the use of unions of different size > in these structures. For example, using hash_param, > there's no way to initialize the trailing part of the > structure. Also, the size of the structure is hard to > figure out. I would like to see padding of all structures > to be same size, and adding a union member that's just padding. > > Same applies to other unions. > Good suggestion :) Let me rework them. Michael, I'd like to add virtio-crypto stuff to your maintaining part likes the virtio-net/blk parts so that the corresponding patches can be CC'ed to you too because the virtio-crypto doesn't lay in driver/virtio directory. Will you? Thanks! -Gonglei -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
