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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Bobby Eshleman CC: , , , , , , From: Arseniy Krasnov Subject: [RFC PATCH v1] virtio/vsock: allocate multiple skbuffs on tx Content-Transfer-Encoding: quoted-printable X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH01.sberdevices.ru (172.16.1.4) To S-MS-EXCH01.sberdevices.ru (172.16.1.4) X-KSMG-Rule-ID: 4 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiPhishing: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2023/03/17 09:15:00 #20959649 X-KSMG-AntiVirus-Status: Clean, skipped Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This adds small optimization for tx path: instead of allocating single skbuff on every call to transport, allocate multiple skbuffs until credit space allows, thus trying to send as much as possible data without return to af_vsock.c. Signed-off-by: Arseniy Krasnov --- net/vmw_vsock/virtio_transport_common.c | 45 +++++++++++++++++-------- 1 file changed, 31 insertions(+), 14 deletions(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio= _transport_common.c index 6564192e7f20..cda587196475 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -196,7 +196,8 @@ static int virtio_transport_send_pkt_info(struct vsock_= sock *vsk, const struct virtio_transport *t_ops; struct virtio_vsock_sock *vvs; u32 pkt_len =3D info->pkt_len; - struct sk_buff *skb; + u32 rest_len; + int ret; =20 info->type =3D virtio_transport_get_type(sk_vsock(vsk)); =20 @@ -216,10 +217,6 @@ static int virtio_transport_send_pkt_info(struct vsock= _sock *vsk, =20 vvs =3D vsk->trans; =20 - /* we can send less than pkt_len bytes */ - if (pkt_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) - pkt_len =3D VIRTIO_VSOCK_MAX_PKT_BUF_SIZE; - /* virtio_transport_get_credit might return less than pkt_len credit */ pkt_len =3D virtio_transport_get_credit(vvs, pkt_len); =20 @@ -227,17 +224,37 @@ static int virtio_transport_send_pkt_info(struct vsoc= k_sock *vsk, if (pkt_len =3D=3D 0 && info->op =3D=3D VIRTIO_VSOCK_OP_RW) return pkt_len; =20 - skb =3D virtio_transport_alloc_skb(info, pkt_len, - src_cid, src_port, - dst_cid, dst_port); - if (!skb) { - virtio_transport_put_credit(vvs, pkt_len); - return -ENOMEM; - } + rest_len =3D pkt_len; =20 - virtio_transport_inc_tx_pkt(vvs, skb); + do { + struct sk_buff *skb; + size_t skb_len; + + skb_len =3D min_t(u32, VIRTIO_VSOCK_MAX_PKT_BUF_SIZE, rest_len); + + skb =3D virtio_transport_alloc_skb(info, skb_len, + src_cid, src_port, + dst_cid, dst_port); + if (!skb) { + ret =3D -ENOMEM; + goto out; + } =20 - return t_ops->send_pkt(skb); + virtio_transport_inc_tx_pkt(vvs, skb); + + ret =3D t_ops->send_pkt(skb); + + if (ret < 0) + goto out; + + rest_len -=3D skb_len; + } while (rest_len); + + return pkt_len; + +out: + virtio_transport_put_credit(vvs, rest_len); + return ret; } =20 static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs, --=20 2.25.1