From: Stefano Garzarella <sgarzare@redhat.com>
To: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Cc: Stefan Hajnoczi <stefanha@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Bobby Eshleman <bobby.eshleman@bytedance.com>,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel@sberdevices.ru, oxffffaa@gmail.com
Subject: Re: [RFC PATCH v5 03/17] vsock/virtio: support to send non-linear skb
Date: Thu, 6 Jul 2023 18:51:01 +0200 [thread overview]
Message-ID: <joml4wolu5r2wpetvbfezu6buwfnfntu5okxjacfgdsp7uaebk@onkmwg7r7fod> (raw)
In-Reply-To: <20230701063947.3422088-4-AVKrasnov@sberdevices.ru>
On Sat, Jul 01, 2023 at 09:39:33AM +0300, Arseniy Krasnov wrote:
>For non-linear skb use its pages from fragment array as buffers in
>virtio tx queue. These pages are already pinned by 'get_user_pages()'
>during such skb creation.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>---
> Changelog:
> v4 -> v5:
> * Use 'out_sgs' variable to index 'bufs', not only 'sgs'.
> * Move smaller branch above, see 'if (!skb_is_nonlinear(skb)').
> * Remove blank line.
> * R-b from Bobby Eshleman removed due to patch update.
>
> net/vmw_vsock/virtio_transport.c | 40 +++++++++++++++++++++++++++-----
> 1 file changed, 34 insertions(+), 6 deletions(-)
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
>
>diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
>index e95df847176b..6cbb45bb12d2 100644
>--- a/net/vmw_vsock/virtio_transport.c
>+++ b/net/vmw_vsock/virtio_transport.c
>@@ -100,7 +100,9 @@ virtio_transport_send_pkt_work(struct work_struct *work)
> vq = vsock->vqs[VSOCK_VQ_TX];
>
> for (;;) {
>- struct scatterlist hdr, buf, *sgs[2];
>+ /* +1 is for packet header. */
>+ struct scatterlist *sgs[MAX_SKB_FRAGS + 1];
>+ struct scatterlist bufs[MAX_SKB_FRAGS + 1];
> int ret, in_sg = 0, out_sg = 0;
> struct sk_buff *skb;
> bool reply;
>@@ -111,12 +113,38 @@ virtio_transport_send_pkt_work(struct work_struct *work)
>
> virtio_transport_deliver_tap_pkt(skb);
> reply = virtio_vsock_skb_reply(skb);
>+ sg_init_one(&bufs[out_sg], virtio_vsock_hdr(skb),
>+ sizeof(*virtio_vsock_hdr(skb)));
>+ sgs[out_sg] = &bufs[out_sg];
>+ out_sg++;
>+
>+ if (!skb_is_nonlinear(skb)) {
>+ if (skb->len > 0) {
>+ sg_init_one(&bufs[out_sg], skb->data, skb->len);
>+ sgs[out_sg] = &bufs[out_sg];
>+ out_sg++;
>+ }
>+ } else {
>+ struct skb_shared_info *si;
>+ int i;
>+
>+ si = skb_shinfo(skb);
>+
>+ for (i = 0; i < si->nr_frags; i++) {
>+ skb_frag_t *skb_frag = &si->frags[i];
>+ void *va = page_to_virt(skb_frag->bv_page);
>
>- sg_init_one(&hdr, virtio_vsock_hdr(skb), sizeof(*virtio_vsock_hdr(skb)));
>- sgs[out_sg++] = &hdr;
>- if (skb->len > 0) {
>- sg_init_one(&buf, skb->data, skb->len);
>- sgs[out_sg++] = &buf;
>+ /* We will use 'page_to_virt()' for userspace page here,
>+ * because virtio layer will call 'virt_to_phys()' later
>+ * to fill buffer descriptor. We don't touch memory at
>+ * "virtual" address of this page.
>+ */
>+ sg_init_one(&bufs[out_sg],
>+ va + skb_frag->bv_offset,
>+ skb_frag->bv_len);
>+ sgs[out_sg] = &bufs[out_sg];
>+ out_sg++;
>+ }
> }
>
> ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, skb, GFP_KERNEL);
>--
>2.25.1
>
next prev parent reply other threads:[~2023-07-06 16:51 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-01 6:39 [RFC PATCH v5 00/17] vsock: MSG_ZEROCOPY flag support Arseniy Krasnov
2023-07-01 6:39 ` [RFC PATCH v5 01/17] vsock/virtio: read data from non-linear skb Arseniy Krasnov
2023-07-06 16:47 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 02/17] vhost/vsock: " Arseniy Krasnov
2023-07-06 16:49 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 03/17] vsock/virtio: support to send " Arseniy Krasnov
2023-07-06 16:51 ` Stefano Garzarella [this message]
2023-07-01 6:39 ` [RFC PATCH v5 04/17] vsock/virtio: non-linear skb handling for tap Arseniy Krasnov
2023-07-06 16:51 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 05/17] vsock/virtio: MSG_ZEROCOPY flag support Arseniy Krasnov
2023-07-06 16:53 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 06/17] vsock: fix EPOLLERR set on non-empty error queue Arseniy Krasnov
2023-07-06 16:54 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 07/17] vsock: read from socket's " Arseniy Krasnov
2023-07-06 16:54 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 08/17] vsock: check for MSG_ZEROCOPY support on send Arseniy Krasnov
2023-07-06 16:55 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 09/17] vsock: enable SOCK_SUPPORT_ZC bit Arseniy Krasnov
2023-07-06 16:55 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 10/17] vhost/vsock: support MSG_ZEROCOPY for transport Arseniy Krasnov
2023-07-06 16:55 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 11/17] vsock/virtio: " Arseniy Krasnov
2023-07-06 16:55 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 12/17] vsock/loopback: " Arseniy Krasnov
2023-07-06 16:56 ` Stefano Garzarella
2023-07-01 6:39 ` [RFC PATCH v5 13/17] vsock: enable setting SO_ZEROCOPY Arseniy Krasnov
2023-07-06 16:56 ` Stefano Garzarella
2023-07-12 22:31 ` Bobby Eshleman
2023-07-13 4:37 ` Arseniy Krasnov
2023-07-01 6:39 ` [RFC PATCH v5 14/17] docs: net: description of MSG_ZEROCOPY for AF_VSOCK Arseniy Krasnov
2023-07-06 17:06 ` Stefano Garzarella
2023-07-07 4:45 ` Arseniy Krasnov
2023-07-01 6:39 ` [RFC PATCH v5 15/17] test/vsock: MSG_ZEROCOPY flag tests Arseniy Krasnov
2023-07-01 6:39 ` [RFC PATCH v5 16/17] test/vsock: MSG_ZEROCOPY support for vsock_perf Arseniy Krasnov
2023-07-01 6:39 ` [RFC PATCH v5 17/17] test/vsock: io_uring rx/tx tests Arseniy Krasnov
2023-07-06 17:06 ` Stefano Garzarella
2023-07-07 4:47 ` Arseniy Krasnov
2023-07-06 17:07 ` [RFC PATCH v5 00/17] vsock: MSG_ZEROCOPY flag support Stefano Garzarella
2023-07-07 4:41 ` Arseniy Krasnov
-- strict thread matches above, loose matches on Subject: below --
2023-07-01 6:22 Arseniy Krasnov
2023-07-01 6:22 ` [RFC PATCH v5 03/17] vsock/virtio: support to send non-linear skb Arseniy Krasnov
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