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