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From bb34da88524f313681005435f8fd6d905ca81b6a Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Thu, 17 Aug 2017 09:45:35 +0200
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Subject: [PATCH 2/4] virtio-net: dynamic network offloads configuration
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20170817094536.12740-2-dgilbert@redhat.com>
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Patchwork-id: 76021
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O-Subject: [RHEL-7.5/7.4.z/7.3.z/7.2.z qemu-kvm PATCH v2 1/2] virtio-net: dynamic network offloads configuration
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Bugzilla: 1480428
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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From: Dmitry Fleytman <dfleytma@redhat.com>
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Virtio-net driver currently negotiates network offloads
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on startup via features mechanism and have no ability to
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disable and re-enable offloads later.
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This patch introduced a new control command that allows
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to configure device network offloads state dynamically.
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The patch also introduces a new feature flag
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VIRTIO_NET_F_CTRL_GUEST_OFFLOADS.
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Signed-off-by: Dmitry Fleytman <dfleytma@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Message-id: 20130520081814.GA8162@redhat.com
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Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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(cherry picked from commit 644c98587d4ccc09e7592e1688e4e7fa363c5a75)
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RHEL7.0 qemu-kvm only: Configure ctrl_guest_offloads off
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 hw/net/virtio-net.c            | 99 +++++++++++++++++++++++++++++++++++-------
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 include/hw/i386/pc.h           |  4 ++
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 include/hw/virtio/virtio-net.h | 14 ++++++
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 3 files changed, 102 insertions(+), 15 deletions(-)
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diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
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index 3fde455..eb2feaf 100644
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--- a/hw/net/virtio-net.c
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+++ b/hw/net/virtio-net.c
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@@ -477,6 +477,34 @@ static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
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     return features;
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 }
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+static void virtio_net_apply_guest_offloads(VirtIONet *n)
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+{
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+    tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer,
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+            !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
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+            !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
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+            !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
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+            !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
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+            !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
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+}
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+
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+static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
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+{
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+    static const uint64_t guest_offloads_mask =
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+        (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
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+        (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
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+        (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
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+        (1ULL << VIRTIO_NET_F_GUEST_ECN)  |
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+        (1ULL << VIRTIO_NET_F_GUEST_UFO);
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+
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+    return guest_offloads_mask & features;
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+}
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+
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+static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
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+{
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+    VirtIODevice *vdev = VIRTIO_DEVICE(n);
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+    return virtio_net_guest_offloads_by_features(vdev->guest_features);
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+}
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+
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 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
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 {
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     VirtIONet *n = VIRTIO_NET(vdev);
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@@ -487,12 +515,9 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
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     virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF)));
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     if (n->has_vnet_hdr) {
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-        tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer,
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-                        (features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
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-                        (features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
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-                        (features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
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-                        (features >> VIRTIO_NET_F_GUEST_ECN)  & 1,
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-                        (features >> VIRTIO_NET_F_GUEST_UFO)  & 1);
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+        n->curr_guest_offloads =
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+            virtio_net_guest_offloads_by_features(features);
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+        virtio_net_apply_guest_offloads(n);
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     }
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     for (i = 0;  i < n->max_queues; i++) {
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@@ -547,6 +572,43 @@ static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
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     return VIRTIO_NET_OK;
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 }
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+static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
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+                                     struct iovec *iov, unsigned int iov_cnt)
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+{
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+    VirtIODevice *vdev = VIRTIO_DEVICE(n);
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+    uint64_t offloads;
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+    size_t s;
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+
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+    if (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features)) {
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+        return VIRTIO_NET_ERR;
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+    }
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+
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+    s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
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+    if (s != sizeof(offloads)) {
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+        return VIRTIO_NET_ERR;
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+    }
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+
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+    if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
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+        uint64_t supported_offloads;
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+
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+        if (!n->has_vnet_hdr) {
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+            return VIRTIO_NET_ERR;
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+        }
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+
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+        supported_offloads = virtio_net_supported_guest_offloads(n);
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+        if (offloads & ~supported_offloads) {
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+            return VIRTIO_NET_ERR;
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+        }
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+
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+        n->curr_guest_offloads = offloads;
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+        virtio_net_apply_guest_offloads(n);
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+
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+        return VIRTIO_NET_OK;
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+    } else {
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+        return VIRTIO_NET_ERR;
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+    }
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+}
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+
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 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
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                                  struct iovec *iov, unsigned int iov_cnt)
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 {
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@@ -735,6 +797,8 @@ static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
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             status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
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         } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
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             status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
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+        } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
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+            status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
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         }
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         s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));
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@@ -1253,6 +1317,10 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
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             qemu_put_be32(f, n->vqs[i].tx_waiting);
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         }
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     }
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+
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+    if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) {
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+        qemu_put_be64(f, n->curr_guest_offloads);
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+    }
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 }
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 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
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@@ -1317,15 +1385,6 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
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             error_report("virtio-net: saved image requires vnet_hdr=on");
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             return -1;
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         }
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-
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-        if (n->has_vnet_hdr) {
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-            tap_set_offload(qemu_get_queue(n->nic)->peer,
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-                    (vdev->guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
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-                    (vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
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-                    (vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
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-                    (vdev->guest_features >> VIRTIO_NET_F_GUEST_ECN)  & 1,
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-                    (vdev->guest_features >> VIRTIO_NET_F_GUEST_UFO)  & 1);
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-        }
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     }
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     if (version_id >= 9) {
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@@ -1364,6 +1423,16 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
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         }
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     }
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+    if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) {
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+        n->curr_guest_offloads = qemu_get_be64(f);
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+    } else {
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+        n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
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+    }
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+
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+    if (peer_has_vnet_hdr(n)) {
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+        virtio_net_apply_guest_offloads(n);
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+    }
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+
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     virtio_net_set_queues(n);
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     /* Find the first multicast entry in the saved MAC filter */
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diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
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index 3b8f7d8..89bb458 100644
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--- a/include/hw/i386/pc.h
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+++ b/include/hw/i386/pc.h
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@@ -318,6 +318,10 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);
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             .property = "vectors",\
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             /* DEV_NVECTORS_UNSPECIFIED as a uint32_t string */\
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             .value    = stringify(0xFFFFFFFF),\
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+        },{ \
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+            .driver   = "virtio-net-pci", \
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+            .property = "ctrl_guest_offloads", \
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+            .value    = "off", \
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         },{\
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             .driver   = "e1000",\
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             .property = "romfile",\
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diff --git a/include/hw/virtio/virtio-net.h b/include/hw/virtio/virtio-net.h
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index a02fc50..02fa5c5 100644
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--- a/include/hw/virtio/virtio-net.h
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+++ b/include/hw/virtio/virtio-net.h
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@@ -31,6 +31,8 @@
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 /* The feature bitmap for virtio net */
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 #define VIRTIO_NET_F_CSUM       0       /* Host handles pkts w/ partial csum */
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 #define VIRTIO_NET_F_GUEST_CSUM 1       /* Guest handles pkts w/ partial csum */
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+#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2 /* Control channel offload
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+                                         * configuration support */
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 #define VIRTIO_NET_F_MAC        5       /* Host has given MAC address. */
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 #define VIRTIO_NET_F_GSO        6       /* Host handles pkts w/ any GSO type */
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 #define VIRTIO_NET_F_GUEST_TSO4 7       /* Guest can handle TSOv4 in. */
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@@ -190,6 +192,7 @@ typedef struct VirtIONet {
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     size_t config_size;
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     char *netclient_name;
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     char *netclient_type;
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+    uint64_t curr_guest_offloads;
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 } VirtIONet;
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 #define VIRTIO_NET_CTRL_MAC    1
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@@ -229,6 +232,15 @@ struct virtio_net_ctrl_mq {
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  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
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  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
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+/*
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+ * Control network offloads
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+ *
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+ * Dynamic offloads are available with the
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+ * VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
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+ */
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+#define VIRTIO_NET_CTRL_GUEST_OFFLOADS   5
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+ #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET        0
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+
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 #define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \
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         DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
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         DEFINE_PROP_BIT("any_layout", _state, _field, VIRTIO_F_ANY_LAYOUT, true), \
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@@ -250,6 +262,8 @@ struct virtio_net_ctrl_mq {
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         DEFINE_PROP_BIT("ctrl_vlan", _state, _field, VIRTIO_NET_F_CTRL_VLAN, true), \
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         DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true), \
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         DEFINE_PROP_BIT("ctrl_mac_addr", _state, _field, VIRTIO_NET_F_CTRL_MAC_ADDR, true), \
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+        /* RHEL 7.0 qemu-kvm: ctrl_guest_offloads always configured off */ \
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+        DEFINE_PROP_BIT("ctrl_guest_offloads", _state, _field, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, false), \
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         DEFINE_PROP_BIT("mq", _state, _field, VIRTIO_NET_F_MQ, false)
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 #define DEFINE_VIRTIO_NET_PROPERTIES(_state, _field)                           \
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-- 
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1.8.3.1
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