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Re: [Qemu-devel] [PATCH 1/1 V4] virtio-net: dynamic network offloads con
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From: |
Anthony Liguori |
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Subject: |
Re: [Qemu-devel] [PATCH 1/1 V4] virtio-net: dynamic network offloads configuration |
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Date: |
Sun, 19 May 2013 18:40:26 -0500 |
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User-agent: |
Notmuch/0.15.2+77~g661dcf8 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
"Michael S. Tsirkin" <address@hidden> writes:
> On Mon, Apr 22, 2013 at 12:58:26PM -0500, Anthony Liguori wrote:
>> "Michael S. Tsirkin" <address@hidden> writes:
>>
>> > On Sun, Apr 07, 2013 at 09:34:08AM +0300, Dmitry Fleytman wrote:
>> >> From: Dmitry Fleytman <address@hidden>
>> >>
>> >> 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 <address@hidden>
>> >
>> > Acked-by: Michael S. Tsirkin <address@hidden>
>>
>> I was looking for a Reviewed-by, not just an Acked-by.
>>
>> Regards,
>>
>> Anthony Liguori
>
> Is there anything else we are looking for?
> Can we add this patch in 1.5?
1.5 is done. This patch hasn't applied for quite a long time so it
needs to be resubmitted.
Regards,
Anthony Liguori
>
>
>
>> >
>> > Pls pick this up for 1.5.
>> >
>> >> ---
>> >> hw/pc.h | 4 +++
>> >> hw/virtio-net.c | 97
>> >> ++++++++++++++++++++++++++++++++++++++++++++++++---------
>> >> hw/virtio-net.h | 13 ++++++++
>> >> 3 files changed, 99 insertions(+), 15 deletions(-)
>> >>
>> >> diff --git a/hw/pc.h b/hw/pc.h
>> >> index 8e1dd4c..7ca4698 100644
>> >> --- a/hw/pc.h
>> >> +++ b/hw/pc.h
>> >> @@ -221,6 +221,10 @@ 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/hw/virtio-net.c b/hw/virtio-net.c
>> >> index 5917740..a92d061 100644
>> >> --- a/hw/virtio-net.c
>> >> +++ b/hw/virtio-net.c
>> >> @@ -360,6 +360,33 @@ 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)
>> >> +{
>> >> + return virtio_net_guest_offloads_by_features(n->vdev.guest_features);
>> >> +}
>> >> +
>> >> static void virtio_net_set_features(VirtIODevice *vdev, uint32_t
>> >> features)
>> >> {
>> >> VirtIONet *n = to_virtio_net(vdev);
>> >> @@ -371,12 +398,9 @@ 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++) {
>> >> @@ -422,6 +446,42 @@ 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)
>> >> +{
>> >> + uint64_t offloads;
>> >> + size_t s;
>> >> +
>> >> + if (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) &
>> >> n->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)
>> >> {
>> >> @@ -591,6 +651,8 @@ 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));
>> >> @@ -1100,6 +1162,10 @@ 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) &
>> >> n->vdev.guest_features) {
>> >> + qemu_put_be64(f, n->curr_guest_offloads);
>> >> + }
>> >> }
>> >>
>> >> static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
>> >> @@ -1156,15 +1222,6 @@ 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,
>> >> - (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM)
>> >> & 1,
>> >> - (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4)
>> >> & 1,
>> >> - (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6)
>> >> & 1,
>> >> - (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN)
>> >> & 1,
>> >> - (n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO)
>> >> & 1);
>> >> - }
>> >> }
>> >>
>> >> if (version_id >= 9) {
>> >> @@ -1198,6 +1255,16 @@ static int virtio_net_load(QEMUFile *f, void
>> >> *opaque, int version_id)
>> >> }
>> >> }
>> >>
>> >> + if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) &
>> >> n->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/hw/virtio-net.h b/hw/virtio-net.h
>> >> index 4d1a8cd..70e362d 100644
>> >> --- a/hw/virtio-net.h
>> >> +++ b/hw/virtio-net.h
>> >> @@ -27,6 +27,8 @@
>> >> /* 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. */
>> >> @@ -182,6 +184,7 @@ typedef struct VirtIONet {
>> >> uint16_t max_queues;
>> >> uint16_t curr_queues;
>> >> size_t config_size;
>> >> + uint64_t curr_guest_offloads;
>> >> } VirtIONet;
>> >>
>> >> #define VIRTIO_NET_CTRL_MAC 1
>> >> @@ -221,6 +224,15 @@ 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("csum", _state, _field, VIRTIO_NET_F_CSUM,
>> >> true), \
>> >> @@ -241,6 +253,7 @@ 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), \
>> >> + DEFINE_PROP_BIT("ctrl_guest_offloads", _state, _field,
>> >> VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), \
>> >> DEFINE_PROP_BIT("mq", _state, _field, VIRTIO_NET_F_MQ, false)
>> >>
>> >> #endif
>> >> --
>> >> 1.8.1.4