[ovs-dev] [PATCH V3] netdev-dpdk: Add Jumbo Frame Support.
Flavio Leitner
fbl at sysclose.org
Thu Feb 4 20:51:04 UTC 2016
Some minor comments just in case you decide to spin another version:
On Mon, 1 Feb 2016 10:18:54 +0000
Mark Kavanagh <mark.b.kavanagh at intel.com> wrote:
[...]
> +static uint32_t
> +dpdk_buf_size(struct netdev_dpdk *netdev, int frame_len)
> +{
> + struct rte_eth_dev_info info;
> + uint32_t buf_size;
> + /* XXX: This is a workaround for DPDK v2.2, and needs to be
> refactored with a
> + * future DPDK release. */
> + uint32_t len = frame_len + (2 * DPDK_VLAN_TAG_LEN);
> +
> + if(netdev->type == DPDK_DEV_ETH) {
^ space here
> + 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;
> + } else {
> + buf_size = NETDEV_DPDK_DEFAULT_RX_BUFSIZE;
> + }
> +
> + if(len % buf_size) {
also here
> + 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. */
>
> @@ -280,26 +321,65 @@ 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));
>
> + /* 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);
> +
> + 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);
> +
> memset(m, 0, mp->elt_size);
>
> - /* 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);
> + /* 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, m->buf_len);
> + m->data_off = RTE_MIN(RTE_PKTMBUF_HEADROOM,
> (uint16_t)m->buf_len);
> /* init some constant fields */
> m->pool = mp;
> @@ -315,7 +395,7 @@ 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 +406,7 @@ 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 +419,8 @@ 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 +429,10 @@ 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 +516,7 @@ 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 +528,12 @@ 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)) {
space needed
> + 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 +675,7 @@ 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 +695,16 @@ 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 +747,27 @@ 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");
> + char *end_ptr = NULL;
> + int local_mtu;
> +
> + if(mtu_str) {
> + local_mtu = strtoul(mtu_str, &end_ptr, 0);
> + }
> + if(!mtu_str || local_mtu < ETHER_MTU ||
> + local_mtu >
> FRAME_LEN_TO_MTU(NETDEV_DPDK_MAX_FRAME_LEN) ||
> + *end_ptr != '\0') {
This needs to align with !mtu_str
Thanks,
--
fbl
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