[ovs-dev] [PATCH V2] netdev-dpdk: Add Jumbo Frame Support.
Kavanagh, Mark B
mark.b.kavanagh at intel.com
Tue Feb 16 11:43:27 UTC 2016
>
>"Kavanagh, Mark B" <mark.b.kavanagh at intel.com> writes:
>
>>>
>>>"Kavanagh, Mark B" <mark.b.kavanagh at intel.com> writes:
>>>> Further clarifications below Aaron - please let me know if you have
>>>> any additional comments.
>>>>
>>>> Thanks,
>>>> Mark
>>>
>>>Thanks again for this work, Mark!
>>>
>>>>>
>>>>>One addendum below, Aaron.
>>>>>
>>>>>>
>>>>>>>Hi Mark,
>>>>>>>
>>>>>>>Thanks for the patch! I've not done a very thorough review of this, but
>>>>>>>my first-blush comments are inline.
>>>>>>
>>>>>>Thanks for the review Aaron!
>>>>>>
>>>>>>Any additional comments are welcome - my initial responses are
>> inline, below.
>>>>>>
>>>>>>Thanks,
>>>>>>Mark
>>>>>>
>>>>>>>
>>>>>>>Mark Kavanagh <mark.b.kavanagh at intel.com> writes:
>>>>>>>> Add support for Jumbo Frames to DPDK-enabled port types,
>>>>>>>> using single-segment-mbufs.
>>>>>>>>
>>>>>>>> Using this approach, the amount of memory allocated for each mbuf
>>>>>>>> to store frame data is increased to a value greater than 1518B
>>>>>>>> (typical Ethernet maximum frame length). The increased space
>>>>>>>> available in the mbuf means that an entire Jumbo Frame can be carried
>>>>>>>> in a single mbuf, as opposed to partitioning it across multiple mbuf
>>>>>>>> segments.
>>>>>>>>
>>>>>>>> The amount of space allocated to each mbuf to hold frame data is
>>>>>>>> defined dynamically by the user when adding a DPDK port to a bridge.
>>>>>>>> If an MTU value is not supplied, or the user-supplied value is invalid,
>>>>>>>> the MTU for the port defaults to standard Ethernet MTU (i.e. 1500B).
>>>>>>>>
>>>>>>>> Signed-off-by: Mark Kavanagh <mark.b.kavanagh at intel.com>
>>>>>>>> ---
>>>>>>>
>>>>>>>This is a new feature which has user-visible impact, so should be
>>>>>>>announced in NEWS (plus, it's great news).
>>>>>>
>>>>>>No problem - I'll add an entry.
>>>>>>
>>>>>>>
>>>>>>>> INSTALL.DPDK.md | 59 ++++++++-
>>>>>>>> lib/netdev-dpdk.c | 356
>>>> +++++++++++++++++++++++++++++++++++++++++-------------
>>>>>>>> 2 files changed, 328 insertions(+), 87 deletions(-)
>>>>>>>>
>>>>>>>> diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md
>>>>>>>> index 96b686c..2f23e27 100644
>>>>>>>> --- a/INSTALL.DPDK.md
>>>>>>>> +++ b/INSTALL.DPDK.md
>>>>>>>> @@ -859,10 +859,61 @@ by adding the following string:
>>>>>>>> to <interface> sections of all network devices used by
>> DPDK. Parameter 'N'
>>>>>>>> determines how many queues can be used by the guest.
>>>>>>>>
>>>>>>>> +
>>>>>>>> +Jumbo Frames
>>>>>>>> +------------
>>>>>>>> +
>>>>>>>> +Support for Jumbo Frames may be enabled at run-time for DPDK-type ports.
>>>>>>>> +
>>>>>>>> +To avail of Jumbo Frame support, add the '--dpdk-mtu' option to
>>>> the ovs-vsctl
>>>>>>>> +'add-port' command-line, along with the required MTU for the port.
>>>>>>>> +e.g.
>>>>>>>
>>>>>>>This text and the example do not match. I think '--dpdk-mtu' is not valid.
>>>>>>
>>>>>>Good catch, thanks.
>>>>>>
>>>>>>>
>>>>>>>> +
>>>>>>>> + ```
>>>>>>>> + ovs-vsctl add-port br0 dpdk0 -- set Interface dpdk0 type=dpdk
>>>> options:dpdk-mtu=9000
>>>>>>>> + ```
>>>>>>>> +
>>>>>>>> +When Jumbo Frames are enabled, the size of a DPDK port's mbuf
>> segments are
>>>>>>>> +increased, such that a full Jumbo Frame may be accommodated
>>>> inside a single
>>>>>>>> +mbuf segment. Once set, the MTU for a DPDK port is immutable.
>>>>>>>
>>>>>>>Why no support? DPDK supports changing the mtu.
>>>>>>
>>>>>>I guess my rationale here is that an MTU change can't be triggered
>>>> via OVS command-line, nor
>>>>>>can it be triggered programmatically via DPDK (apart from an
>> explicit call to
>>>>>>rte_eth_dev_set_mtu).
>>>>>>So, while technically it's possibly, from a user's point of view,
>>>> there's no way to
>>>>>configure
>>>>>>it, outside of modifying the code directly. If I've missed something
>>>> here, please let me
>>>>>>know.
>>>>>>
>>>>>>>
>>>>>>>> +Jumbo frame support has been validated against 13312B frames, using the
>>>>>>>> +DPDK `igb_uio` driver, but larger frames and other DPDK NIC drivers may
>>>>>>>> +theoretically be supported. Supported port types excludes
>>>> vHost-Cuse ports, as
>>>>>>>> +this feature is pending deprecation.
>>>>>>>> +
>>>>>>>> +
>>>>>>>> +vHost Ports and Jumbo Frames
>>>>>>>> +----------------------------
>>>>>>>> +Jumbo frame support is available for DPDK vHost-User ports
>>>> only. Some additional
>>>>>>>> +configuration is needed to take advantage of this feature:
>>>>>>>> +
>>>>>>>> + 1. `mergeable buffers` must be enabled for vHost ports, as
>>>> demonstrated in
>>>>>>>> + the QEMU command line snippet below:
>>>>>>>> +
>>>>>>>> + ```
>>>>>>>> + '-netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce \'
>>>>>>>> + '-device
>>>> virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1,mrg_rxbuf=on'
>>>>>>>> + ```
>>>>>>>> +
>>>>>>>> + 2. Where virtio devices are bound to the Linux kernel driver
>> in a guest
>>>>>>>> + environment (i.e. interfaces are not bound to an in-guest DPDK
>>>> driver), the
>>>>>>>> + MTU of those logical network interfaces must also be
>> increased. This
>>>>>>>> + avoids segmentation of Jumbo Frames in the guest. Note that
>>>> 'MTU' refers
>>>>>>>> + to the length of the IP packet only, and not that of the entire
>>>> frame.
>>>>>>>> +
>>>>>>>> + e.g. To calculate the exact MTU of a standard IPv4 frame,
>>>> subtract the L2
>>>>>>>> + header and CRC lengths (i.e. 18B) from the max supported
>> frame size.
>>>>>>>> + So, to set the MTU for a 13312B Jumbo Frame:
>>>>>>>> +
>>>>>>>> + ```
>>>>>>>> + ifconfig eth1 mtu 13294
>>>>>>>> + ```
>>>>>>>> +
>>>>>>>> +
>>>>>>>> Restrictions:
>>>>>>>> -------------
>>>>>>>>
>>>>>>>> - - Work with 1500 MTU, needs few changes in DPDK lib to fix this issue.
>>>>>>>> - Currently DPDK port does not make use any offload functionality.
>>>>>>>> - DPDK-vHost support works with 1G huge pages.
>>>>>>>>
>>>>>>>> @@ -903,6 +954,12 @@ Restrictions:
>>>>>>>> the next release of DPDK (which includes the above patch) is
>>>> available and
>>>>>>>> integrated into OVS.
>>>>>>>>
>>>>>>>> + Jumbo Frames:
>>>>>>>> + - `virtio-pmd`: DPDK apps in the guest do not exit
>>>> gracefully. The source of
>>>>>>>> + this issue is currently being investigated.
>>>>>>>> + - vHost-Cuse: Jumbo Frame support is not available for vHost
>> Cuse ports.
>>>>>>>> +
>>>>>>>> +
>>>>>>>> Bug Reporting:
>>>>>>>> --------------
>>>>>>>>
>>>>>>>> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
>>>>>>>> index de7e488..5f23e28 100644
>>>>>>>> --- a/lib/netdev-dpdk.c
>>>>>>>> +++ b/lib/netdev-dpdk.c
>>>>>>>> @@ -62,20 +62,25 @@ static struct vlog_rate_limit rl =
>>>> VLOG_RATE_LIMIT_INIT(5, 20);
>>>>>>>> #define OVS_CACHE_LINE_SIZE CACHE_LINE_SIZE
>>>>>>>> #define OVS_VPORT_DPDK "ovs_dpdk"
>>>>>>>>
>>>>>>>> +#define NETDEV_DPDK_JUMBO_FRAME_ENABLED 1
>>>>>>>> +#define NETDEV_DPDK_DEFAULT_RX_BUFSIZE 1024
>>>>>>>> +
>>>>>>>> /*
>>>>>>>> * need to reserve tons of extra space in the mbufs so we can align the
>>>>>>>> * DMA addresses to 4KB.
>>>>>>>> * The minimum mbuf size is limited to avoid scatter behaviour
>> and drop in
>>>>>>>> * performance for standard Ethernet MTU.
>>>>>>>> */
>>>>>>>> -#define MTU_TO_MAX_LEN(mtu) ((mtu) + ETHER_HDR_LEN + ETHER_CRC_LEN)
>>>>>>>> -#define MBUF_SIZE_MTU(mtu) (MTU_TO_MAX_LEN(mtu) \
>>>>>>>> - + sizeof(struct dp_packet) \
>>>>>>>> - + RTE_PKTMBUF_HEADROOM)
>>>>>>>> -#define MBUF_SIZE_DRIVER (2048 \
>>>>>>>> - + sizeof (struct rte_mbuf) \
>>>>>>>> - + RTE_PKTMBUF_HEADROOM)
>>>>>>>> -#define MBUF_SIZE(mtu) MAX(MBUF_SIZE_MTU(mtu), MBUF_SIZE_DRIVER)
>>>>>>>> +#define MTU_TO_FRAME_LEN(mtu) ((mtu) + ETHER_HDR_LEN +
>>>> ETHER_CRC_LEN)
>>>>>>>> +#define FRAME_LEN_TO_MTU(frame_len) ((frame_len)- ETHER_HDR_LEN
>>>> - ETHER_CRC_LEN)
>>>>>>>> +#define MBUF_SEGMENT_SIZE(mtu) ( MTU_TO_FRAME_LEN(mtu) \
>>>>>>>> + + sizeof(struct dp_packet) \
>>>>>>>> + + RTE_PKTMBUF_HEADROOM)
>>>>>>>> +
>>>>>>>> +/* This value should be specified as a multiple of the DPDK NIC driver's
>>>>>>>> + * 'min_rx_bufsize' attribute (currently 1024B for 'igb_uio').
>>>>>>>> + */
>>>>>>>> +#define NETDEV_DPDK_MAX_FRAME_LEN 13312
>>>>>>>>
>>>>>>>> /* Max and min number of packets in the mempool. OVS tries to
>> allocate a
>>>>>>>> * mempool with MAX_NB_MBUF: if this fails (because the system
>>>> doesn't have
>>>>>>>> @@ -86,6 +91,8 @@ static struct vlog_rate_limit rl =
>>>> VLOG_RATE_LIMIT_INIT(5, 20);
>>>>>>>> #define MIN_NB_MBUF (4096 * 4)
>>>>>>>> #define MP_CACHE_SZ RTE_MEMPOOL_CACHE_MAX_SIZE
>>>>>>>>
>>>>>>>> +#define DPDK_VLAN_TAG_LEN 4
>>>>>>>> +
>>>>>>>> /* MAX_NB_MBUF can be divided by 2 many times, until MIN_NB_MBUF */
>>>>>>>> BUILD_ASSERT_DECL(MAX_NB_MBUF %
>>>> ROUND_DOWN_POW2(MAX_NB_MBUF/MIN_NB_MBUF) == 0);
>>>>>>>>
>>>>>>>> @@ -114,7 +121,6 @@ static const struct rte_eth_conf port_conf = {
>>>>>>>> .header_split = 0, /* Header Split disabled */
>>>>>>>> .hw_ip_checksum = 0, /* IP checksum offload disabled */
>>>>>>>> .hw_vlan_filter = 0, /* VLAN filtering disabled */
>>>>>>>> - .jumbo_frame = 0, /* Jumbo Frame Support disabled */
>>>>>>>> .hw_strip_crc = 0,
>>>>>>>> },
>>>>>>>> .rx_adv_conf = {
>>>>>>>> @@ -254,6 +260,39 @@ is_dpdk_class(const struct netdev_class *class)
>>>>>>>> return class->construct == netdev_dpdk_construct;
>>>>>>>> }
>>>>>>>>
>>>>>>>> +/* DPDK NIC drivers allocate RX buffers at a particular granularity
>>>>>>>> + * (specified by rte_eth_dev_info.min_rx_bufsize - currently 1K
>>>> for igb_uio).
>>>>>>>> + * If 'frame_len' is not a multiple of this value, insufficient
>>>> buffers are
>>>>>>>> + * allocated to accomodate the packet in its
>>>> entirety. Furthermore, the igb_uio
>>>>>>>> + * driver needs to ensure that there is also sufficient space in
>>>> the Rx buffer
>>>>>>>> + * to accommodate two VLAN tags (for QinQ frames). If the RX
>> buffer is too
>>>>>>>> + * small, then the driver enables scatter RX behaviour, which reduces
>>>>>>>> + * performance. To prevent this, use a buffer size that is closest to
>>>>>>>> + * 'frame_len', but which satisfies the aforementioned criteria.
>>>>>>>> + */
>>>>>>>> +static uint32_t
>>>>>>>> +dpdk_buf_size(struct netdev_dpdk *netdev, int frame_len)
>>>>>>>> +{
>>>>>>>> + struct rte_eth_dev_info info;
>>>>>>>> + uint32_t buf_size;
>>>>>>>> + uint32_t len = frame_len + (2 * DPDK_VLAN_TAG_LEN);
>>>>>>>> +
>>>>>>>> + if(netdev->type == DPDK_DEV_ETH) {
>>>>>>>> + rte_eth_dev_info_get(netdev->port_id, &info);
>>>>>>>> + buf_size = (info.min_rx_bufsize == 0) ?
>>>>>>>> + NETDEV_DPDK_DEFAULT_RX_BUFSIZE :
>>>>>>>> + info.min_rx_bufsize;
>>>>>>>
>>>>>>>Why not use the rte_eth_dev_get_mtu call to get the port configured mtu?
>>>>>>
>>>>>>I'm not sure if I follow - the MTU isn't the issue here, but rather
>>>> the buffer size used
>>>>>>when creating the rte_mempool, which must be a multiple of the
>>>> driver's min_rx_bufsize.
>>>>>>
>>>>>>>
>>>>>>>> + } else {
>>>>>>>> + buf_size = NETDEV_DPDK_DEFAULT_RX_BUFSIZE;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + if(len % buf_size) {
>>>>>>>> + len = buf_size * ((len/buf_size) + 1);
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + return len;
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> /* XXX: use dpdk malloc for entire OVS. in fact huge page should be used
>>>>>>>> * for all other segments data, bss and text. */
>>>>>>>>
>>>>>>>> @@ -280,31 +319,70 @@ free_dpdk_buf(struct dp_packet *p)
>>>>>>>> }
>>>>>>>>
>>>>>>>> static void
>>>>>>>> -__rte_pktmbuf_init(struct rte_mempool *mp,
>>>>>>>> - void *opaque_arg OVS_UNUSED,
>>>>>>>> - void *_m,
>>>>>>>> - unsigned i OVS_UNUSED)
>>>>>>>> +ovs_rte_pktmbuf_pool_init(struct rte_mempool *mp, void *opaque_arg)
>>>>>>>> {
>>>>>>>> - struct rte_mbuf *m = _m;
>>>>>>>> - uint32_t buf_len = mp->elt_size - sizeof(struct dp_packet);
>>>>>>>> + struct rte_pktmbuf_pool_private *user_mbp_priv, *mbp_priv;
>>>>>>>> + struct rte_pktmbuf_pool_private default_mbp_priv;
>>>>>>>> + uint16_t roomsz;
>>>>>>>>
>>>>>>>> RTE_MBUF_ASSERT(mp->elt_size >= sizeof(struct dp_packet));
>>>>>>>>
>>>>>>>> - memset(m, 0, mp->elt_size);
>>>>>>>> + /* if no structure is provided, assume no mbuf private area */
>>>>>>>> +
>>>>>>>> + user_mbp_priv = opaque_arg;
>>>>>>>> + if (user_mbp_priv == NULL) {
>>>>>>>> + default_mbp_priv.mbuf_priv_size = 0;
>>>>>>>> + if (mp->elt_size > sizeof(struct dp_packet)) {
>>>>>>>> + roomsz = mp->elt_size - sizeof(struct dp_packet);
>>>>>>>> + } else {
>>>>>>>> + roomsz = 0;
>>>>>>>> + }
>>>>>>>> + default_mbp_priv.mbuf_data_room_size = roomsz;
>>>>>>>> + user_mbp_priv = &default_mbp_priv;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + RTE_MBUF_ASSERT(mp->elt_size >= sizeof(struct dp_packet) +
>>>>>>>> + user_mbp_priv->mbuf_data_room_size +
>>>>>>>> + user_mbp_priv->mbuf_priv_size);
>>>>>>>> +
>>>>>>>> + mbp_priv = rte_mempool_get_priv(mp);
>>>>>>>> + memcpy(mbp_priv, user_mbp_priv, sizeof(*mbp_priv));
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> +/* Initialise some fields in the mbuf structure that are not
>>>> modified by the
>>>>>>>> + * user once created (origin pool, buffer start address, etc.*/
>>>>>>>> +static void
>>>>>>>> +__ovs_rte_pktmbuf_init(struct rte_mempool *mp,
>>>>>>>> + void *opaque_arg OVS_UNUSED,
>>>>>>>> + void *_m,
>>>>>>>> + unsigned i OVS_UNUSED)
>>>>>>>> +{
>>>>>>>> + struct rte_mbuf *m = _m;
>>>>>>>> + uint32_t buf_size, buf_len, priv_size;
>>>>>>>> +
>>>>>>>> + priv_size = rte_pktmbuf_priv_size(mp);
>>>>>>>> + buf_size = sizeof(struct dp_packet) + priv_size;
>>>>>>>> + buf_len = rte_pktmbuf_data_room_size(mp);
>>>>>>>>
>>>>>>>> - /* start of buffer is just after mbuf structure */
>>>>>>>> - m->buf_addr = (char *)m + sizeof(struct dp_packet);
>>>>>>>> - m->buf_physaddr = rte_mempool_virt2phy(mp, m) +
>>>>>>>> - sizeof(struct dp_packet);
>>>>>>>> - m->buf_len = (uint16_t)buf_len;
>>>>>>>> + RTE_MBUF_ASSERT(RTE_ALIGN(priv_size, RTE_MBUF_PRIV_ALIGN) ==
>> priv_size);
>>>>>>>> + RTE_MBUF_ASSERT(mp->elt_size >= buf_size);
>>>>>>>> + RTE_MBUF_ASSERT(buf_len <= UINT16_MAX);
>>>>>>>>
>>>>>>>> - /* keep some headroom between start of buffer and data */
>>>>>>>> - m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM, m->buf_len);
>>>>>>>> + memset(m, 0, mp->elt_size);
>>>>>>>>
>>>>>>>> - /* init some constant fields */
>>>>>>>> - m->pool = mp;
>>>>>>>> - m->nb_segs = 1;
>>>>>>>> - m->port = 0xff;
>>>>>>>> + /* start of buffer is after dp_packet structure and priv data */
>>>>>>>> + m->priv_size = priv_size;
>>>>>>>> + m->buf_addr = (char *)m + buf_size;
>>>>>>>> + m->buf_physaddr = rte_mempool_virt2phy(mp, m) + buf_size;
>>>>>>>> + m->buf_len = (uint16_t)buf_len;
>>>>>>>> +
>>>>>>>> + /* keep some headroom between start of buffer and data */
>>>>>>>> + m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM,
>> (uint16_t)m->buf_len);
>>>>>>>> +
>>>>>>>> + /* init some constant fields */
>>>>>>>> + m->pool = mp;
>>>>>>>> + m->nb_segs = 1;
>>>>>>>> + m->port = 0xff;
>>>>>>>
>>>>>>>Please don't mix tabs and spaces in the file.
>>>>>>
>>>>>>Apologies - this was a copy/paste from a DPDK file, which uses tabs.
>>>>>>
>>>>>>>
>>>>>>>> }
>>>>>>>>
>>>>>>>> static void
>>>>>>>> @@ -315,7 +393,7 @@ ovs_rte_pktmbuf_init(struct rte_mempool *mp,
>>>>>>>> {
>>>>>>>> struct rte_mbuf *m = _m;
>>>>>>>>
>>>>>>>> - __rte_pktmbuf_init(mp, opaque_arg, _m, i);
>>>>>>>> + __ovs_rte_pktmbuf_init(mp, opaque_arg, m, i);
>>>>>>>>
>>>>>>>> dp_packet_init_dpdk((struct dp_packet *) m, m->buf_len);
>>>>>>>> }
>>>>>>>> @@ -326,6 +404,7 @@ dpdk_mp_get(int socket_id, int mtu)
>>>> OVS_REQUIRES(dpdk_mutex)
>>>>>>>> struct dpdk_mp *dmp = NULL;
>>>>>>>> char mp_name[RTE_MEMPOOL_NAMESIZE];
>>>>>>>> unsigned mp_size;
>>>>>>>> + struct rte_pktmbuf_pool_private mbp_priv;
>>>>>>>>
>>>>>>>> LIST_FOR_EACH (dmp, list_node, &dpdk_mp_list) {
>>>>>>>> if (dmp->socket_id == socket_id && dmp->mtu == mtu) {
>>>>>>>> @@ -338,6 +417,8 @@ dpdk_mp_get(int socket_id, int mtu)
>>>> OVS_REQUIRES(dpdk_mutex)
>>>>>>>> dmp->socket_id = socket_id;
>>>>>>>> dmp->mtu = mtu;
>>>>>>>> dmp->refcount = 1;
>>>>>>>> + mbp_priv.mbuf_data_room_size = MTU_TO_FRAME_LEN(mtu) +
>>>> RTE_PKTMBUF_HEADROOM;
>>>>>>>> + mbp_priv.mbuf_priv_size = 0;
>>>>>>>>
>>>>>>>> mp_size = MAX_NB_MBUF;
>>>>>>>> do {
>>>>>>>> @@ -346,10 +427,10 @@ dpdk_mp_get(int socket_id, int mtu)
>>>> OVS_REQUIRES(dpdk_mutex)
>>>>>>>> return NULL;
>>>>>>>> }
>>>>>>>>
>>>>>>>> - dmp->mp = rte_mempool_create(mp_name, mp_size, MBUF_SIZE(mtu),
>>>>>>>> + dmp->mp = rte_mempool_create(mp_name, mp_size,
>>>> MBUF_SEGMENT_SIZE(mtu),
>>>>>>>> MP_CACHE_SZ,
>>>>>>>> sizeof(struct rte_pktmbuf_pool_private),
>>>>>>>> - rte_pktmbuf_pool_init, NULL,
>>>>>>>> + ovs_rte_pktmbuf_pool_init, &mbp_priv,
>>>>>>>> ovs_rte_pktmbuf_init, NULL,
>>>>>>>> socket_id, 0);
>>>>>>>> } while (!dmp->mp && rte_errno == ENOMEM && (mp_size /= 2) >=
>>>> MIN_NB_MBUF);
>>>>>>>> @@ -433,6 +514,7 @@ dpdk_eth_dev_queue_setup(struct netdev_dpdk
>>>> *dev, int n_rxq, int
>>>>>>n_txq)
>>>>>>>> {
>>>>>>>> int diag = 0;
>>>>>>>> int i;
>>>>>>>> + struct rte_eth_conf conf = port_conf;
>>>>>>>>
>>>>>>>> /* A device may report more queues than it makes available (this has
>>>>>>>> * been observed for Intel xl710, which reserves some of them for
>>>>>>>> @@ -444,7 +526,12 @@ dpdk_eth_dev_queue_setup(struct netdev_dpdk
>>>> *dev, int n_rxq, int
>>>>>>>n_txq)
>>>>>>>> VLOG_INFO("Retrying setup with (rxq:%d txq:%d)", n_rxq, n_txq);
>>>>>>>> }
>>>>>>>>
>>>>>>>> - diag = rte_eth_dev_configure(dev->port_id, n_rxq, n_txq,
>>>> &port_conf);
>>>>>>>> + if(OVS_UNLIKELY(dev->mtu > ETHER_MTU)) {
>>>>>>>> + conf.rxmode.jumbo_frame = NETDEV_DPDK_JUMBO_FRAME_ENABLED;
>>>>>>>> + conf.rxmode.max_rx_pkt_len = MTU_TO_FRAME_LEN(dev->mtu);
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + diag = rte_eth_dev_configure(dev->port_id, n_rxq, n_txq, &conf);
>>>>>>>> if (diag) {
>>>>>>>> break;
>>>>>>>> }
>>>>>>>> @@ -586,6 +673,7 @@ netdev_dpdk_init(struct netdev *netdev_,
>>>> unsigned int port_no,
>>>>>>>> struct netdev_dpdk *netdev = netdev_dpdk_cast(netdev_);
>>>>>>>> int sid;
>>>>>>>> int err = 0;
>>>>>>>> + uint32_t buf_size;
>>>>>>>>
>>>>>>>> ovs_mutex_init(&netdev->mutex);
>>>>>>>> ovs_mutex_lock(&netdev->mutex);
>>>>>>>> @@ -605,10 +693,16 @@ netdev_dpdk_init(struct netdev *netdev_,
>>>> unsigned int port_no,
>>>>>>>> netdev->port_id = port_no;
>>>>>>>> netdev->type = type;
>>>>>>>> netdev->flags = 0;
>>>>>>>> +
>>>>>>>> + /* Initialize port's MTU and frame len to the default
>> Ethernet values.
>>>>>>>> + * Larger, user-specified (jumbo) frame buffers are accommodated in
>>>>>>>> + * netdev_dpdk_set_config.
>>>>>>>> + */
>>>>>>>> + netdev->max_packet_len = ETHER_MAX_LEN;
>>>>>>>> netdev->mtu = ETHER_MTU;
>>>>>>>> - netdev->max_packet_len = MTU_TO_MAX_LEN(netdev->mtu);
>>>>>>>>
>>>>>>>> - netdev->dpdk_mp = dpdk_mp_get(netdev->socket_id, netdev->mtu);
>>>>>>>> + buf_size = dpdk_buf_size(netdev, ETHER_MAX_LEN);
>>>>>>>> + netdev->dpdk_mp = dpdk_mp_get(netdev->socket_id,
>>>> FRAME_LEN_TO_MTU(buf_size));
>>>>>>>> if (!netdev->dpdk_mp) {
>>>>>>>> err = ENOMEM;
>>>>>>>> goto unlock;
>>>>>>>> @@ -651,6 +745,24 @@ dpdk_dev_parse_name(const char dev_name[],
>>>> const char prefix[],
>>>>>>>> return 0;
>>>>>>>> }
>>>>>>>>
>>>>>>>> +static void
>>>>>>>> +dpdk_dev_parse_mtu(const struct smap *args, int *mtu)
>>>>>>>> +{
>>>>>>>> + const char *mtu_str = smap_get(args, "dpdk-mtu");
>>>>>>>> + int local_mtu;
>>>>>>>> +
>>>>>>>> + if(mtu_str) {
>>>>>>>> + local_mtu = atoi(mtu_str);
>>>>>>>
>>>>>>>Please use strtol or strtoul here, and detect errors in the string by
>>>>>>>checking endptr. That way, we can be sure that random garbage on the
>>>>>>>stack won't accidentally become the mtu.
>>>>>>
>>>>>>Will do, thanks.
>>>>>>
>>>>>>>
>>>>>>>> + }
>>>>>>>> + if(!mtu_str || local_mtu < ETHER_MTU ||
>>>>>>>> + local_mtu > FRAME_LEN_TO_MTU(NETDEV_DPDK_MAX_FRAME_LEN)) {
>>>>>>>> + local_mtu = ETHER_MTU;
>>>>>>>> + VLOG_WARN("Invalid or missing dpdk-mtu parameter - defaulting
>>>> to %d.\n",
>>>>>>>> + local_mtu);
>>>>>>>> + }
>>>>>>>> + *mtu = local_mtu;
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> static int
>>>>>>>> vhost_construct_helper(struct netdev *netdev_) OVS_REQUIRES(dpdk_mutex)
>>>>>>>> {
>>>>>>>> @@ -777,11 +889,77 @@ netdev_dpdk_get_config(const struct netdev
>>>> *netdev_, struct smap
>>>>>>>*args)
>>>>>>>> smap_add_format(args, "configured_rx_queues", "%d", netdev_->n_rxq);
>>>>>>>> smap_add_format(args, "requested_tx_queues", "%d", netdev_->n_txq);
>>>>>>>> smap_add_format(args, "configured_tx_queues", "%d",
>> dev->real_n_txq);
>>>>>>>> + smap_add_format(args, "mtu", "%d", dev->mtu);
>>>>>>>> ovs_mutex_unlock(&dev->mutex);
>>>>>>>>
>>>>>>>> return 0;
>>>>>>>> }
>>>>>>>>
>>>>>>>> +/* Set the mtu of DPDK_DEV_ETH ports */
>>>>>>>> +static int
>>>>>>>> +netdev_dpdk_set_mtu(const struct netdev *netdev, int mtu)
>>>>>>>> +{
>>>>>>>> + struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
>>>>>>>> + int old_mtu, err;
>>>>>>>> + uint32_t buf_size;
>>>>>>>> + int dpdk_mtu;
>>>>>>>> + struct dpdk_mp *old_mp;
>>>>>>>> + struct dpdk_mp *mp;
>>>>>>>> +
>>>>>>>> + ovs_mutex_lock(&dpdk_mutex);
>>>>>>>> + ovs_mutex_lock(&dev->mutex);
>>>>>>>> + if (dev->mtu == mtu) {
>>>>>>>> + err = 0;
>>>>>>>> + goto out;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + buf_size = dpdk_buf_size(dev, MTU_TO_FRAME_LEN(mtu));
>>>>>>>> + dpdk_mtu = FRAME_LEN_TO_MTU(buf_size);
>>>>>>>> +
>>>>>>>> + mp = dpdk_mp_get(dev->socket_id, dpdk_mtu);
>>>>>>>> + if (!mp) {
>>>>>>>> + err = ENOMEM;
>>>>>>>> + goto out;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + rte_eth_dev_stop(dev->port_id);
>>>>>>>> +
>>>>>>>> + old_mtu = dev->mtu;
>>>>>>>> + old_mp = dev->dpdk_mp;
>>>>>>>> + dev->dpdk_mp = mp;
>>>>>>>> + dev->mtu = mtu;
>>>>>>>> + dev->max_packet_len = MTU_TO_FRAME_LEN(dev->mtu);
>>>>>>>> +
>>>>>>>> + err = dpdk_eth_dev_init(dev);
>>>>>>>
>>>>>>>Why call the dpdk_eth_dev_init here? Since you are directly calling
>>>>>>>rte_eth_dev_X functions here - wouldn't it make sense to use the
>>>>>>>rte_eth_dev_start() instead?
>>>>
>>>> The rx queues for the device need to be assigned the mempool that was
>>>> allocated for the jumbo frames; since dpdk_eth_dev_init handles the
>>>> queue setup, rte_eth_dev configuration, etc. it makes sense to call it
>>>> here.
>>>>
>>>>>>
>>>>>>This is legacy code, but I can refactor if needs be.
>>>>>>
>>>>>>>
>>>>>>>> + if (err) {
>>>>>>>> + VLOG_WARN("Unable to set MTU '%d' for '%s'; reverting to last
>>>> known "
>>>>>>>> + "good value '%d'\n", mtu, dev->up.name, old_mtu);
>>>>>>>> + dpdk_mp_put(mp);
>>>>>>>> + dev->mtu = old_mtu;
>>>>>>>> + dev->dpdk_mp = old_mp;
>>>>>>>> + dev->max_packet_len = MTU_TO_FRAME_LEN(dev->mtu);
>>>>>>>> + err = dpdk_eth_dev_init(dev);
>>>>>>>
>>>>>>>What happens if this returns a failure? By using dpdk_eth_dev_init, you
>>>>>>>will cause a queue reconfiguration action, which is not needed, and can
>>>>>>>error.
>>>>
>>>> This call is needed, in case the eth_dev's queue configuration was
>>>> changed by the previous call.
>>>> The error handling for this call is arguably outside the scope of this
>>>> patch, and could be submitted as a separate patch - what do you think?
>>>
>>>That's probably a good idea.
>>>
>>>>>>>
>>>>>>
>>>>>>As above.
>>>>>>
>>>>>>>If you are intending to set MTU, I would have expected calls to
>>>>>>>rte_eth_dev_set_mtu. However, I don't see any. Is there a reason? I
>>>>>>>recognize that much of this is legacy, but since you are touching it :)
>>>>>>
>>>>>>I actually had a number of issues with rte_eth_dev_set_mtu early on
>>>> in the patch; I can take
>>>>>>a second look now that the code is more stable though.
>>>>>
>>>>>I remembered why I didn't use this.
>>>>>
>>>>>If you look at the IXGBE driver's mtu_set function, it refuses frame
>>>> lengths which are larger
>>>>>than the eth_dev's min_rx_buf_size (- RTE_PKTMBUF_HEADROOM).
>>>>>This might be avoided by configuring the device for scatter RX
>>>> behavior, but this incurs a
>>>>>performance impact.
>>>
>>>It seems strange to me that we need to ignore the library API for this
>>>one case, right? What if the user is only doing vhostuser PMDs mixed
>>>with a bnx2x card?
>>>
>>
>> I can't say that I've familiar enough with this setup to form an
>> answer on that one Aaron.
>>
>>>It would be better to get it fixed in the library, I think. After all,
>>>they gave a generic setting to change MTU - why don't they make it
>>>behave well?
>>>
>>
>> Let me follow up on that with some local DPDK folks here.
>>
Just a quick follow up on this Aaron: I did implement a version of this patch that used rte_eth_dev_set_mtu; however, not all DPDK drivers yet implement that function (e.g. i40e), so I reverted to the previous version.
DPDK team did mention that the _set_mtu function for i40e should be implemented 'soon', but no dates were specified. See this thread on the DPDK ML for more details: http://dpdk.org/ml/archives/dev/2016-February/032910.html
>> Would you consider this a showstopper for upstreaming of this feature?
>> If we need to wait for a change to DPDK, Jumbo Frames will miss the
>> 2.5 window.
>
>I don't think it would be a show stopper as long as other devices wouldn't
>be negatively impacted, but it's a place where a /*XXX: This is a
>workaround for dpdk*/ comment should be included so that we can fix it
>when/if it is updated in the library. What do you think?
>
>>>>><snippet>
>>>>>ixgbe_dev_mtu_set(...) {
>>>>>
>>>>>...
>>>>>
>>>>> /* refuse mtu that requires the support of scattered packets when this
>>>>> * feature has not been enabled before. */
>>>>> if (!dev->data->scattered_rx &&
>>>>> (frame_size + 2 * IXGBE_VLAN_TAG_SIZE >
>>>>> dev->data->min_rx_buf_size - RTE_PKTMBUF_HEADROOM))
>>>>> return -EINVAL;
>>>>>
>>>>>...
>>>>>}
>>>>></snippet>
>>>>>
>>>>>
>>>>>>
>>>>>>>
>>>>>>>> + goto out;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + dpdk_mp_put(old_mp);
>>>>>>>> + netdev_change_seq_changed(netdev);
>>>>>>>> +out:
>>>>>>>> + ovs_mutex_unlock(&dev->mutex);
>>>>>>>> + ovs_mutex_unlock(&dpdk_mutex);
>>>>>>>> + return err;
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> +static int
>>>>>>>> +netdev_dpdk_set_config(struct netdev *netdev_, const struct smap *args)
>>>>>>>> +{
>>>>>>>> + int mtu;
>>>>>>>> +
>>>>>>>> + dpdk_dev_parse_mtu(args, &mtu);
>>>>>>>> +
>>>>>>>> + return netdev_dpdk_set_mtu(netdev_, mtu);
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> static int
>>>>>>>> netdev_dpdk_get_numa_id(const struct netdev *netdev_)
>>>>>>>> {
>>>>>>>> @@ -1358,54 +1536,6 @@ netdev_dpdk_get_mtu(const struct netdev
>>>> *netdev, int *mtup)
>>>>>>>>
>>>>>>>> return 0;
>>>>>>>> }
>>>>>>>> -
>>>>>>>> -static int
>>>>>>>> -netdev_dpdk_set_mtu(const struct netdev *netdev, int mtu)
>>>>>>>> -{
>>>>>>>> - struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
>>>>>>>> - int old_mtu, err;
>>>>>>>> - struct dpdk_mp *old_mp;
>>>>>>>> - struct dpdk_mp *mp;
>>>>>>>> -
>>>>>>>> - ovs_mutex_lock(&dpdk_mutex);
>>>>>>>> - ovs_mutex_lock(&dev->mutex);
>>>>>>>> - if (dev->mtu == mtu) {
>>>>>>>> - err = 0;
>>>>>>>> - goto out;
>>>>>>>> - }
>>>>>>>> -
>>>>>>>> - mp = dpdk_mp_get(dev->socket_id, dev->mtu);
>>>>>>>> - if (!mp) {
>>>>>>>> - err = ENOMEM;
>>>>>>>> - goto out;
>>>>>>>> - }
>>>>>>>> -
>>>>>>>> - rte_eth_dev_stop(dev->port_id);
>>>>>>>> -
>>>>>>>> - old_mtu = dev->mtu;
>>>>>>>> - old_mp = dev->dpdk_mp;
>>>>>>>> - dev->dpdk_mp = mp;
>>>>>>>> - dev->mtu = mtu;
>>>>>>>> - dev->max_packet_len = MTU_TO_MAX_LEN(dev->mtu);
>>>>>>>> -
>>>>>>>> - err = dpdk_eth_dev_init(dev);
>>>>>>>> - if (err) {
>>>>>>>> - dpdk_mp_put(mp);
>>>>>>>> - dev->mtu = old_mtu;
>>>>>>>> - dev->dpdk_mp = old_mp;
>>>>>>>> - dev->max_packet_len = MTU_TO_MAX_LEN(dev->mtu);
>>>>>>>> - dpdk_eth_dev_init(dev);
>>>>>>>> - goto out;
>>>>>>>> - }
>>>>>>>> -
>>>>>>>> - dpdk_mp_put(old_mp);
>>>>>>>> - netdev_change_seq_changed(netdev);
>>>>>>>> -out:
>>>>>>>> - ovs_mutex_unlock(&dev->mutex);
>>>>>>>> - ovs_mutex_unlock(&dpdk_mutex);
>>>>>>>> - return err;
>>>>>>>> -}
>>>>>>>> -
>>>>>>>> static int
>>>>>>>> netdev_dpdk_get_carrier(const struct netdev *netdev_, bool *carrier);
>>>>>>>>
>>>>>>>> @@ -1682,7 +1812,7 @@ netdev_dpdk_get_status(const struct netdev
>>>> *netdev_, struct smap
>>>>>>>*args)
>>>>>>>> smap_add_format(args, "numa_id", "%d",
>>>> rte_eth_dev_socket_id(dev->port_id));
>>>>>>>> smap_add_format(args, "driver_name", "%s", dev_info.driver_name);
>>>>>>>> smap_add_format(args, "min_rx_bufsize", "%u",
>>>> dev_info.min_rx_bufsize);
>>>>>>>> - smap_add_format(args, "max_rx_pktlen", "%u",
>> dev_info.max_rx_pktlen);
>>>>>>>> + smap_add_format(args, "max_rx_pktlen", "%u", dev->max_packet_len);
>>>>>>>> smap_add_format(args, "max_rx_queues", "%u",
>> dev_info.max_rx_queues);
>>>>>>>> smap_add_format(args, "max_tx_queues", "%u",
>> dev_info.max_tx_queues);
>>>>>>>> smap_add_format(args, "max_mac_addrs", "%u",
>> dev_info.max_mac_addrs);
>>>>>>>> @@ -1904,6 +2034,51 @@ dpdk_vhost_user_class_init(void)
>>>>>>>> return 0;
>>>>>>>> }
>>>>>>>>
>>>>>>>> +/* Set the mtu of DPDK_DEV_VHOST ports */
>>>>>>>> +static int
>>>>>>>> +netdev_dpdk_vhost_set_mtu(const struct netdev *netdev, int mtu)
>>>>>>>> +{
>>>>>>>> + struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
>>>>>>>> + int err = 0;
>>>>>>>> + struct dpdk_mp *old_mp;
>>>>>>>> + struct dpdk_mp *mp;
>>>>>>>> +
>>>>>>>> + ovs_mutex_lock(&dpdk_mutex);
>>>>>>>> + ovs_mutex_lock(&dev->mutex);
>>>>>>>> + if (dev->mtu == mtu) {
>>>>>>>> + err = 0;
>>>>>>>> + goto out;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + mp = dpdk_mp_get(dev->socket_id, mtu);
>>>>>>>> + if (!mp) {
>>>>>>>> + err = ENOMEM;
>>>>>>>> + goto out;
>>>>>>>> + }
>>>>>>>> +
>>>>>>>> + old_mp = dev->dpdk_mp;
>>>>>>>> + dev->dpdk_mp = mp;
>>>>>>>> + dev->mtu = mtu;
>>>>>>>> + dev->max_packet_len = MTU_TO_FRAME_LEN(dev->mtu);
>>>>>>>> +
>>>>>>>> + dpdk_mp_put(old_mp);
>>>>>>>> + netdev_change_seq_changed(netdev);
>>>>>>>> +out:
>>>>>>>> + ovs_mutex_unlock(&dev->mutex);
>>>>>>>> + ovs_mutex_unlock(&dpdk_mutex);
>>>>>>>> + return err;
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> +static int
>>>>>>>> +netdev_dpdk_vhost_set_config(struct netdev *netdev_, const
>>>> struct smap *args)
>>>>>>>> +{
>>>>>>>> + int mtu;
>>>>>>>> +
>>>>>>>> + dpdk_dev_parse_mtu(args, &mtu);
>>>>>>>> +
>>>>>>>> + return netdev_dpdk_vhost_set_mtu(netdev_, mtu);
>>>>>>>> +}
>>>>>>>> +
>>>>>>>> static void
>>>>>>>> dpdk_common_init(void)
>>>>>>>> {
>>>>>>>> @@ -2040,8 +2215,9 @@ unlock_dpdk:
>>>>>>>> return err;
>>>>>>>> }
>>>>>>>>
>>>>>>>> -#define NETDEV_DPDK_CLASS(NAME, INIT, CONSTRUCT, DESTRUCT,
>> MULTIQ, SEND, \
>>>>>>>> - GET_CARRIER, GET_STATS, GET_FEATURES, GET_STATUS, RXQ_RECV) \
>>>>>>>> +#define NETDEV_DPDK_CLASS(NAME, INIT, CONSTRUCT, DESTRUCT, SET_CONFIG, \
>>>>>>>> + MULTIQ, SEND, SET_MTU, GET_CARRIER, GET_STATS, GET_FEATURES, \
>>>>>>>> + GET_STATUS, RXQ_RECV) \
>>>>>>>> { \
>>>>>>>> NAME, \
>>>>>>>> INIT, /* init */ \
>>>>>>>> @@ -2053,7 +2229,7 @@ unlock_dpdk:
>>>>>>>> DESTRUCT, \
>>>>>>>> netdev_dpdk_dealloc, \
>>>>>>>> netdev_dpdk_get_config, \
>>>>>>>> - NULL, /* netdev_dpdk_set_config */ \
>>>>>>>> + SET_CONFIG, \
>>>>>>>> NULL, /* get_tunnel_config */ \
>>>>>>>> NULL, /* build header */ \
>>>>>>>> NULL, /* push header */ \
>>>>>>>> @@ -2067,7 +2243,7 @@ unlock_dpdk:
>>>>>>>> netdev_dpdk_set_etheraddr, \
>>>>>>>> netdev_dpdk_get_etheraddr, \
>>>>>>>> netdev_dpdk_get_mtu, \
>>>>>>>> - netdev_dpdk_set_mtu, \
>>>>>>>> + SET_MTU, \
>>>>>>>> netdev_dpdk_get_ifindex, \
>>>>>>>> GET_CARRIER, \
>>>>>>>> netdev_dpdk_get_carrier_resets, \
>>>>>>>> @@ -2213,8 +2389,10 @@ static const struct netdev_class dpdk_class =
>>>>>>>> NULL,
>>>>>>>> netdev_dpdk_construct,
>>>>>>>> netdev_dpdk_destruct,
>>>>>>>> + netdev_dpdk_set_config,
>>>>>>>> netdev_dpdk_set_multiq,
>>>>>>>> netdev_dpdk_eth_send,
>>>>>>>> + netdev_dpdk_set_mtu,
>>>>>>>> netdev_dpdk_get_carrier,
>>>>>>>> netdev_dpdk_get_stats,
>>>>>>>> netdev_dpdk_get_features,
>>>>>>>> @@ -2227,8 +2405,10 @@ static const struct netdev_class dpdk_ring_class =
>>>>>>>> NULL,
>>>>>>>> netdev_dpdk_ring_construct,
>>>>>>>> netdev_dpdk_destruct,
>>>>>>>> + netdev_dpdk_set_config,
>>>>>>>> netdev_dpdk_set_multiq,
>>>>>>>> netdev_dpdk_ring_send,
>>>>>>>> + netdev_dpdk_set_mtu,
>>>>>>>> netdev_dpdk_get_carrier,
>>>>>>>> netdev_dpdk_get_stats,
>>>>>>>> netdev_dpdk_get_features,
>>>>>>>> @@ -2241,8 +2421,10 @@ static const struct netdev_class
>>>> OVS_UNUSED dpdk_vhost_cuse_class
>>>>>=
>>>>>>>> dpdk_vhost_cuse_class_init,
>>>>>>>> netdev_dpdk_vhost_cuse_construct,
>>>>>>>> netdev_dpdk_vhost_destruct,
>>>>>>>> + NULL,
>>>>>>>> netdev_dpdk_vhost_set_multiq,
>>>>>>>> netdev_dpdk_vhost_send,
>>>>>>>> + NULL,
>>>>>>>> netdev_dpdk_vhost_get_carrier,
>>>>>>>> netdev_dpdk_vhost_get_stats,
>>>>>>>> NULL,
>>>>>>>> @@ -2255,8 +2437,10 @@ static const struct netdev_class
>>>> OVS_UNUSED dpdk_vhost_user_class
>>>>>=
>>>>>>>> dpdk_vhost_user_class_init,
>>>>>>>> netdev_dpdk_vhost_user_construct,
>>>>>>>> netdev_dpdk_vhost_destruct,
>>>>>>>> + netdev_dpdk_vhost_set_config,
>>>>>>>> netdev_dpdk_vhost_set_multiq,
>>>>>>>> netdev_dpdk_vhost_send,
>>>>>>>> + netdev_dpdk_vhost_set_mtu,
>>>>>>>> netdev_dpdk_vhost_get_carrier,
>>>>>>>> netdev_dpdk_vhost_get_stats,
>>>>>>>> NULL,
>>>>>>_______________________________________________
>>>>>>dev mailing list
>>>>>>dev at openvswitch.org
>>>>>>http://openvswitch.org/mailman/listinfo/dev
>>>>>_______________________________________________
>>>>>dev mailing list
>>>>>dev at openvswitch.org
>>>>>http://openvswitch.org/mailman/listinfo/dev
>>><#secure method=pgpmime mode=encrypt>
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