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Date: Tue, 25 Jul 2023 10:43:54 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: Arseniy Krasnov <avkrasnov@...rdevices.ru>
Cc: Stefan Hajnoczi <stefanha@...hat.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
Bobby Eshleman <bobby.eshleman@...edance.com>, kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org, kernel@...rdevices.ru,
oxffffaa@...il.com
Subject: Re: [PATCH net-next v3 4/4] vsock/virtio: MSG_ZEROCOPY flag support
On Fri, Jul 21, 2023 at 08:09:03AM +0300, Arseniy Krasnov wrote:
>
>
>On 21.07.2023 00:42, Arseniy Krasnov wrote:
>> This adds handling of MSG_ZEROCOPY flag on transmission path: if this
>> flag is set and zerocopy transmission is possible (enabled in socket
>> options and transport allows zerocopy), then non-linear skb will be
>> created and filled with the pages of user's buffer. Pages of user's
>> buffer are locked in memory by 'get_user_pages()'. Second thing that
>> this patch does is replace type of skb owning: instead of calling
>> 'skb_set_owner_sk_safe()' it calls 'skb_set_owner_w()'. Reason of this
>> change is that '__zerocopy_sg_from_iter()' increments 'sk_wmem_alloc'
>> of socket, so to decrease this field correctly proper skb destructor is
>> needed: 'sock_wfree()'. This destructor is set by 'skb_set_owner_w()'.
>>
>> Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>> ---
>> Changelog:
>> v5(big patchset) -> v1:
>> * Refactorings of 'if' conditions.
>> * Remove extra blank line.
>> * Remove 'frag_off' field unneeded init.
>> * Add function 'virtio_transport_fill_skb()' which fills both linear
>> and non-linear skb with provided data.
>> v1 -> v2:
>> * Use original order of last four arguments in 'virtio_transport_alloc_skb()'.
>> v2 -> v3:
>> * Add new transport callback: 'msgzerocopy_check_iov'. It checks that
>> provided 'iov_iter' with data could be sent in a zerocopy mode.
>> If this callback is not set in transport - transport allows to send
>> any 'iov_iter' in zerocopy mode. Otherwise - if callback returns 'true'
>> then zerocopy is allowed. Reason of this callback is that in case of
>> G2H transmission we insert whole skb to the tx virtio queue and such
>> skb must fit to the size of the virtio queue to be sent in a single
>> iteration (may be tx logic in 'virtio_transport.c' could be reworked
>> as in vhost to support partial send of current skb). This callback
>> will be enabled only for G2H path. For details pls see comment
>> 'Check that tx queue...' below.
>>
>> include/net/af_vsock.h | 3 +
>> net/vmw_vsock/virtio_transport.c | 39 ++++
>> net/vmw_vsock/virtio_transport_common.c | 257 ++++++++++++++++++------
>> 3 files changed, 241 insertions(+), 58 deletions(-)
>>
>> diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>> index 0e7504a42925..a6b346eeeb8e 100644
>> --- a/include/net/af_vsock.h
>> +++ b/include/net/af_vsock.h
>> @@ -177,6 +177,9 @@ struct vsock_transport {
>>
>> /* Read a single skb */
>> int (*read_skb)(struct vsock_sock *, skb_read_actor_t);
>> +
>> + /* Zero-copy. */
>> + bool (*msgzerocopy_check_iov)(const struct iov_iter *);
>> };
>>
>> /**** CORE ****/
>> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
>> index 7bbcc8093e51..23cb8ed638c4 100644
>> --- a/net/vmw_vsock/virtio_transport.c
>> +++ b/net/vmw_vsock/virtio_transport.c
>> @@ -442,6 +442,43 @@ static void virtio_vsock_rx_done(struct virtqueue *vq)
>> queue_work(virtio_vsock_workqueue, &vsock->rx_work);
>> }
>>
>> +static bool virtio_transport_msgzerocopy_check_iov(const struct iov_iter *iov)
>> +{
>> + struct virtio_vsock *vsock;
>> + bool res = false;
>> +
>> + rcu_read_lock();
>> +
>> + vsock = rcu_dereference(the_virtio_vsock);
>> + if (vsock) {
>> + struct virtqueue *vq;
>> + int iov_pages;
>> +
>> + vq = vsock->vqs[VSOCK_VQ_TX];
>> +
>> + iov_pages = round_up(iov->count, PAGE_SIZE) / PAGE_SIZE;
>> +
>> + /* Check that tx queue is large enough to keep whole
>> + * data to send. This is needed, because when there is
>> + * not enough free space in the queue, current skb to
>> + * send will be reinserted to the head of tx list of
>> + * the socket to retry transmission later, so if skb
>> + * is bigger than whole queue, it will be reinserted
>> + * again and again, thus blocking other skbs to be sent.
>> + * Each page of the user provided buffer will be added
>> + * as a single buffer to the tx virtqueue, so compare
>> + * number of pages against maximum capacity of the queue.
>> + * +1 means buffer for the packet header.
>> + */
>> + if (iov_pages + 1 <= vq->num_max)
>
>I think this check is actual only for case one we don't have indirect buffer feature.
>With indirect mode whole data to send will be packed into one indirect buffer.
I think so.
So, should we check also that here?
>
>Thanks, Arseniy
>
>> + res = true;
>> + }
>> +
>> + rcu_read_unlock();
>> +
>> + return res;
>> +}
>> +
>> static bool virtio_transport_seqpacket_allow(u32 remote_cid);
>>
>> static struct virtio_transport virtio_transport = {
>> @@ -475,6 +512,8 @@ static struct virtio_transport virtio_transport = {
>> .seqpacket_allow = virtio_transport_seqpacket_allow,
>> .seqpacket_has_data = virtio_transport_seqpacket_has_data,
>>
>> + .msgzerocopy_check_iov = virtio_transport_msgzerocopy_check_iov,
>> +
>> .notify_poll_in = virtio_transport_notify_poll_in,
>> .notify_poll_out = virtio_transport_notify_poll_out,
>> .notify_recv_init = virtio_transport_notify_recv_init,
>> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
>> index 26a4d10da205..e4e3d541aff4 100644
>> --- a/net/vmw_vsock/virtio_transport_common.c
>> +++ b/net/vmw_vsock/virtio_transport_common.c
>> @@ -37,73 +37,122 @@ virtio_transport_get_ops(struct vsock_sock *vsk)
>> return container_of(t, struct virtio_transport, transport);
>> }
>>
>> -/* Returns a new packet on success, otherwise returns NULL.
>> - *
>> - * If NULL is returned, errp is set to a negative errno.
>> - */
>> -static struct sk_buff *
>> -virtio_transport_alloc_skb(struct virtio_vsock_pkt_info *info,
>> - size_t len,
>> - u32 src_cid,
>> - u32 src_port,
>> - u32 dst_cid,
>> - u32 dst_port)
>> -{
>> - const size_t skb_len = VIRTIO_VSOCK_SKB_HEADROOM + len;
>> - struct virtio_vsock_hdr *hdr;
>> - struct sk_buff *skb;
>> - void *payload;
>> - int err;
>> +static bool virtio_transport_can_zcopy(struct virtio_vsock_pkt_info *info,
>> + size_t max_to_send)
>> +{
>> + const struct vsock_transport *t;
>> + struct iov_iter *iov_iter;
>>
>> - skb = virtio_vsock_alloc_skb(skb_len, GFP_KERNEL);
>> - if (!skb)
>> - return NULL;
>> + if (!info->msg)
>> + return false;
>>
>> - hdr = virtio_vsock_hdr(skb);
>> - hdr->type = cpu_to_le16(info->type);
>> - hdr->op = cpu_to_le16(info->op);
>> - hdr->src_cid = cpu_to_le64(src_cid);
>> - hdr->dst_cid = cpu_to_le64(dst_cid);
>> - hdr->src_port = cpu_to_le32(src_port);
>> - hdr->dst_port = cpu_to_le32(dst_port);
>> - hdr->flags = cpu_to_le32(info->flags);
>> - hdr->len = cpu_to_le32(len);
>> + iov_iter = &info->msg->msg_iter;
>>
>> - if (info->msg && len > 0) {
>> - payload = skb_put(skb, len);
>> - err = memcpy_from_msg(payload, info->msg, len);
>> - if (err)
>> - goto out;
>> + t = vsock_core_get_transport(info->vsk);
>>
>> - if (msg_data_left(info->msg) == 0 &&
>> - info->type == VIRTIO_VSOCK_TYPE_SEQPACKET) {
>> - hdr->flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
>> + if (t->msgzerocopy_check_iov &&
>> + !t->msgzerocopy_check_iov(iov_iter))
>> + return false;
I'd avoid adding a new transport callback used only internally in virtio
transports.
Usually the transport callbacks are used in af_vsock.c, if we need a
callback just for virtio transports, maybe better to add it in struct
virtio_vsock_pkt_info or struct virtio_vsock_sock.
Maybe better the last one so we don't have to allocate pointer space
for each packet and you should reach it via info.
Thanks,
Stefano
>>
>> - if (info->msg->msg_flags & MSG_EOR)
>> - hdr->flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
>> - }
>> + /* Data is simple buffer. */
>> + if (iter_is_ubuf(iov_iter))
>> + return true;
>> +
>> + if (!iter_is_iovec(iov_iter))
>> + return false;
>> +
>> + if (iov_iter->iov_offset)
>> + return false;
>> +
>> + /* We can't send whole iov. */
>> + if (iov_iter->count > max_to_send)
>> + return false;
>> +
>> + return true;
>> +}
>> +
>> +static int virtio_transport_init_zcopy_skb(struct vsock_sock *vsk,
>> + struct sk_buff *skb,
>> + struct msghdr *msg,
>> + bool zerocopy)
>> +{
>> + struct ubuf_info *uarg;
>> +
>> + if (msg->msg_ubuf) {
>> + uarg = msg->msg_ubuf;
>> + net_zcopy_get(uarg);
>> + } else {
>> + struct iov_iter *iter = &msg->msg_iter;
>> + struct ubuf_info_msgzc *uarg_zc;
>> + int len;
>> +
>> + /* Only ITER_IOVEC or ITER_UBUF are allowed and
>> + * checked before.
>> + */
>> + if (iter_is_iovec(iter))
>> + len = iov_length(iter->__iov, iter->nr_segs);
>> + else
>> + len = iter->count;
>> +
>> + uarg = msg_zerocopy_realloc(sk_vsock(vsk),
>> + len,
>> + NULL);
>> + if (!uarg)
>> + return -1;
>> +
>> + uarg_zc = uarg_to_msgzc(uarg);
>> + uarg_zc->zerocopy = zerocopy ? 1 : 0;
>> }
>>
>> - if (info->reply)
>> - virtio_vsock_skb_set_reply(skb);
>> + skb_zcopy_init(skb, uarg);
>>
>> - trace_virtio_transport_alloc_pkt(src_cid, src_port,
>> - dst_cid, dst_port,
>> - len,
>> - info->type,
>> - info->op,
>> - info->flags);
>> + return 0;
>> +}
>>
>> - if (info->vsk && !skb_set_owner_sk_safe(skb, sk_vsock(info->vsk))) {
>> - WARN_ONCE(1, "failed to allocate skb on vsock socket with sk_refcnt == 0\n");
>> - goto out;
>> +static int virtio_transport_fill_skb(struct sk_buff *skb,
>> + struct virtio_vsock_pkt_info *info,
>> + size_t len,
>> + bool zcopy)
>> +{
>> + if (zcopy) {
>> + return __zerocopy_sg_from_iter(info->msg, NULL, skb,
>> + &info->msg->msg_iter,
>> + len);
>> + } else {
>> + void *payload;
>> + int err;
>> +
>> + payload = skb_put(skb, len);
>> + err = memcpy_from_msg(payload, info->msg, len);
>> + if (err)
>> + return -1;
>> +
>> + if (msg_data_left(info->msg))
>> + return 0;
>> +
>> + return 0;
>> }
>> +}
>>
>> - return skb;
>> +static void virtio_transport_init_hdr(struct sk_buff *skb,
>> + struct virtio_vsock_pkt_info *info,
>> + u32 src_cid,
>> + u32 src_port,
>> + u32 dst_cid,
>> + u32 dst_port,
>> + size_t len)
>> +{
>> + struct virtio_vsock_hdr *hdr;
>>
>> -out:
>> - kfree_skb(skb);
>> - return NULL;
>> + hdr = virtio_vsock_hdr(skb);
>> + hdr->type = cpu_to_le16(info->type);
>> + hdr->op = cpu_to_le16(info->op);
>> + hdr->src_cid = cpu_to_le64(src_cid);
>> + hdr->dst_cid = cpu_to_le64(dst_cid);
>> + hdr->src_port = cpu_to_le32(src_port);
>> + hdr->dst_port = cpu_to_le32(dst_port);
>> + hdr->flags = cpu_to_le32(info->flags);
>> + hdr->len = cpu_to_le32(len);
>> }
>>
>> static void virtio_transport_copy_nonlinear_skb(const struct sk_buff *skb,
>> @@ -214,6 +263,70 @@ static u16 virtio_transport_get_type(struct sock *sk)
>> return VIRTIO_VSOCK_TYPE_SEQPACKET;
>> }
>>
>> +static struct sk_buff *virtio_transport_alloc_skb(struct vsock_sock *vsk,
>> + struct virtio_vsock_pkt_info *info,
>> + size_t payload_len,
>> + bool zcopy,
>> + u32 src_cid,
>> + u32 src_port,
>> + u32 dst_cid,
>> + u32 dst_port)
>> +{
>> + struct sk_buff *skb;
>> + size_t skb_len;
>> +
>> + skb_len = VIRTIO_VSOCK_SKB_HEADROOM;
>> +
>> + if (!zcopy)
>> + skb_len += payload_len;
>> +
>> + skb = virtio_vsock_alloc_skb(skb_len, GFP_KERNEL);
>> + if (!skb)
>> + return NULL;
>> +
>> + virtio_transport_init_hdr(skb, info, src_cid, src_port,
>> + dst_cid, dst_port,
>> + payload_len);
>> +
>> + /* Set owner here, because '__zerocopy_sg_from_iter()' uses
>> + * owner of skb without check to update 'sk_wmem_alloc'.
>> + */
>> + if (vsk)
>> + skb_set_owner_w(skb, sk_vsock(vsk));
>> +
>> + if (info->msg && payload_len > 0) {
>> + int err;
>> +
>> + err = virtio_transport_fill_skb(skb, info, payload_len, zcopy);
>> + if (err)
>> + goto out;
>> +
>> + if (info->type == VIRTIO_VSOCK_TYPE_SEQPACKET) {
>> + struct virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
>> +
>> + hdr->flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
>> +
>> + if (info->msg->msg_flags & MSG_EOR)
>> + hdr->flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
>> + }
>> + }
>> +
>> + if (info->reply)
>> + virtio_vsock_skb_set_reply(skb);
>> +
>> + trace_virtio_transport_alloc_pkt(src_cid, src_port,
>> + dst_cid, dst_port,
>> + payload_len,
>> + info->type,
>> + info->op,
>> + info->flags);
>> +
>> + return skb;
>> +out:
>> + kfree_skb(skb);
>> + return NULL;
>> +}
>> +
>> /* This function can only be used on connecting/connected sockets,
>> * since a socket assigned to a transport is required.
>> *
>> @@ -222,10 +335,12 @@ static u16 virtio_transport_get_type(struct sock *sk)
>> static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
>> struct virtio_vsock_pkt_info *info)
>> {
>> + u32 max_skb_len = VIRTIO_VSOCK_MAX_PKT_BUF_SIZE;
>> u32 src_cid, src_port, dst_cid, dst_port;
>> const struct virtio_transport *t_ops;
>> struct virtio_vsock_sock *vvs;
>> u32 pkt_len = info->pkt_len;
>> + bool can_zcopy = false;
>> u32 rest_len;
>> int ret;
>>
>> @@ -254,15 +369,30 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
>> if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
>> return pkt_len;
>>
>> + if (info->msg) {
>> + /* If zerocopy is not enabled by 'setsockopt()', we behave as
>> + * there is no MSG_ZEROCOPY flag set.
>> + */
>> + if (!sock_flag(sk_vsock(vsk), SOCK_ZEROCOPY))
>> + info->msg->msg_flags &= ~MSG_ZEROCOPY;
>> +
>> + if (info->msg->msg_flags & MSG_ZEROCOPY)
>> + can_zcopy = virtio_transport_can_zcopy(info, pkt_len);
>> +
>> + if (can_zcopy)
>> + max_skb_len = min_t(u32, VIRTIO_VSOCK_MAX_PKT_BUF_SIZE,
>> + (MAX_SKB_FRAGS * PAGE_SIZE));
>> + }
>> +
>> rest_len = pkt_len;
>>
>> do {
>> struct sk_buff *skb;
>> size_t skb_len;
>>
>> - skb_len = min_t(u32, VIRTIO_VSOCK_MAX_PKT_BUF_SIZE, rest_len);
>> + skb_len = min(max_skb_len, rest_len);
>>
>> - skb = virtio_transport_alloc_skb(info, skb_len,
>> + skb = virtio_transport_alloc_skb(vsk, info, skb_len, can_zcopy,
>> src_cid, src_port,
>> dst_cid, dst_port);
>> if (!skb) {
>> @@ -270,6 +400,17 @@ static int virtio_transport_send_pkt_info(struct vsock_sock *vsk,
>> break;
>> }
>>
>> + /* This is last skb to send this portion of data. */
>> + if (info->msg && info->msg->msg_flags & MSG_ZEROCOPY &&
>> + skb_len == rest_len && info->op == VIRTIO_VSOCK_OP_RW) {
>> + if (virtio_transport_init_zcopy_skb(vsk, skb,
>> + info->msg,
>> + can_zcopy)) {
>> + ret = -ENOMEM;
>> + break;
>> + }
>> + }
>> +
>> virtio_transport_inc_tx_pkt(vvs, skb);
>>
>> ret = t_ops->send_pkt(skb);
>> @@ -934,7 +1075,7 @@ static int virtio_transport_reset_no_sock(const struct virtio_transport *t,
>> if (!t)
>> return -ENOTCONN;
>>
>> - reply = virtio_transport_alloc_skb(&info, 0,
>> + reply = virtio_transport_alloc_skb(NULL, &info, 0, false,
>> le64_to_cpu(hdr->dst_cid),
>> le32_to_cpu(hdr->dst_port),
>> le64_to_cpu(hdr->src_cid),
>
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