From 9ad5adcf08f30da0140cce21fae64df3087d8207 Mon Sep 17 00:00:00 2001 From: Shesha Sreenivasamurthy Date: Fri, 19 Feb 2016 13:36:53 -0800 Subject: Handle dynamic enable/disable VHOST_USER interface If number of Qs enabled by the guest is less than number of Qs exported to guest, then all threads route packet to Q0 with the assumption that guest is not interested in performance. If all Qs are enabled, each thread queues packet in their own TX-Q of the VHOST_USER interface, boosting performance. Change-Id: Ic24bb8c0505b11c7513aeecd21c9ec5da5f90138 Signed-off-by: Shesha Sreenivasamurthy --- vnet/vnet/devices/dpdk/device.c | 17 ++++++++++++----- vnet/vnet/devices/dpdk/dpdk.h | 1 + vnet/vnet/devices/dpdk/init.c | 2 ++ vnet/vnet/devices/dpdk/vhost_user.c | 20 ++++++++++++++------ 4 files changed, 29 insertions(+), 11 deletions(-) (limited to 'vnet') diff --git a/vnet/vnet/devices/dpdk/device.c b/vnet/vnet/devices/dpdk/device.c index 2f9f135a..327f9dec 100644 --- a/vnet/vnet/devices/dpdk/device.c +++ b/vnet/vnet/devices/dpdk/device.c @@ -221,7 +221,8 @@ u32 tx_burst_vector_internal (vlib_main_t * vm, * This device only supports one TX queue, * and we're running multi-threaded... */ - if (PREDICT_FALSE(xd->lockp != 0)) + if (PREDICT_FALSE(xd->dev_type != VNET_DPDK_DEV_VHOST_USER && + xd->lockp != 0)) { queue_id = queue_id % xd->tx_q_used; while (__sync_lock_test_and_set (xd->lockp[queue_id], 1)) @@ -264,8 +265,12 @@ u32 tx_burst_vector_internal (vlib_main_t * vm, else if (xd->dev_type == VNET_DPDK_DEV_VHOST_USER) { u32 offset = 0; + if (xd->need_txlock) { + queue_id = 0; + while (__sync_lock_test_and_set (xd->lockp[queue_id], 1)); + } #if RTE_VERSION >= RTE_VERSION_NUM(2, 2, 0, 0) - if (PREDICT_TRUE(xd->lockp == NULL)) { + else { dpdk_device_and_queue_t * dq; vec_foreach (dq, dm->devices_by_cpu[vm->cpu_index]) { @@ -274,8 +279,6 @@ u32 tx_burst_vector_internal (vlib_main_t * vm, } assert (dq); offset = dq->queue_id * VIRTIO_QNUM; - } else { - offset = queue_id * VIRTIO_QNUM; } #endif if (PREDICT_TRUE(tx_head > tx_tail)) @@ -331,6 +334,9 @@ u32 tx_burst_vector_internal (vlib_main_t * vm, n_retry = (rv == DPDK_TX_RING_SIZE - tx_tail) ? 1 : 0; } + + if (xd->need_txlock) + *xd->lockp[queue_id] = 0; } #if RTE_LIBRTE_KNI else if (xd->dev_type == VNET_DPDK_DEV_KNI) @@ -370,7 +376,8 @@ u32 tx_burst_vector_internal (vlib_main_t * vm, rv = 0; } - if (PREDICT_FALSE(xd->lockp != 0)) + if (PREDICT_FALSE(xd->dev_type != VNET_DPDK_DEV_VHOST_USER && + xd->lockp != 0)) *xd->lockp[queue_id] = 0; if (PREDICT_FALSE(rv < 0)) diff --git a/vnet/vnet/devices/dpdk/dpdk.h b/vnet/vnet/devices/dpdk/dpdk.h index 48c17729..da4e381b 100644 --- a/vnet/vnet/devices/dpdk/dpdk.h +++ b/vnet/vnet/devices/dpdk/dpdk.h @@ -246,6 +246,7 @@ typedef struct { dpdk_port_type_t port_type; dpdk_efd_agent_t efd_agent; + u8 need_txlock; /* Used by VNET_DPDK_DEV_VHOST_USER */ } dpdk_device_t; #define MAX_NELTS 32 diff --git a/vnet/vnet/devices/dpdk/init.c b/vnet/vnet/devices/dpdk/init.c index a67ee458..6589d2fe 100644 --- a/vnet/vnet/devices/dpdk/init.c +++ b/vnet/vnet/devices/dpdk/init.c @@ -215,6 +215,7 @@ dpdk_device_lock_init(dpdk_device_t * xd) CLIB_CACHE_LINE_BYTES); memset ((void *) xd->lockp[q], 0, CLIB_CACHE_LINE_BYTES); } + xd->need_txlock = 1; } void @@ -226,6 +227,7 @@ dpdk_device_lock_free(dpdk_device_t * xd) clib_mem_free((void *) xd->lockp[q]); vec_free(xd->lockp); xd->lockp = 0; + xd->need_txlock = 0; } static clib_error_t * diff --git a/vnet/vnet/devices/dpdk/vhost_user.c b/vnet/vnet/devices/dpdk/vhost_user.c index 0efbbef3..b6b31baf 100644 --- a/vnet/vnet/devices/dpdk/vhost_user.c +++ b/vnet/vnet/devices/dpdk/vhost_user.c @@ -198,7 +198,7 @@ dpdk_create_vhost_user_if_internal (u32 * hw_if_index, u32 if_id, u8 *hwaddr) int num_qpairs = 1; #if RTE_VERSION >= RTE_VERSION_NUM(2, 2, 0, 0) - num_qpairs = dm->use_rss < 1 ? 1 : dm->use_rss; + num_qpairs = dm->use_rss < 1 ? 1 : tm->n_vlib_mains; #endif dpdk_device_t * xd = NULL; @@ -242,9 +242,7 @@ dpdk_create_vhost_user_if_internal (u32 * hw_if_index, u32 if_id, u8 *hwaddr) // reset lockp dpdk_device_lock_free(xd); - - if (xd->tx_q_used < tm->n_vlib_mains) - dpdk_device_lock_init(xd); + dpdk_device_lock_init(xd); // reset tx vectors for (j = 0; j < tm->n_vlib_mains; j++) @@ -301,8 +299,7 @@ dpdk_create_vhost_user_if_internal (u32 * hw_if_index, u32 if_id, u8 *hwaddr) xd->vu_vhost_dev.virtqueue[j]->backend = -1; } - if (xd->tx_q_used < dm->input_cpu_count) - dpdk_device_lock_init(xd); + dpdk_device_lock_init(xd); DBG_SOCK("tm->n_vlib_mains: %d. TX %d, RX: %d, num_qpairs: %d, Lock: %p", tm->n_vlib_mains, xd->tx_q_used, xd->rx_q_used, num_qpairs, xd->lockp); @@ -706,6 +703,17 @@ int dpdk_vhost_user_set_vring_enable(u32 hw_if_index, u8 idx, int enable) */ vui->vrings[idx].enabled = enable; /* Save local copy */ + int numqs = xd->vu_vhost_dev.virt_qp_nb * VIRTIO_QNUM; + while (numqs--) { + if (! vui->vrings[numqs].enabled) + break; + } + + if (numqs == -1) /* All Qs are enabled */ + xd->need_txlock = 0; + else + xd->need_txlock = 1; + vq = xd->vu_vhost_dev.virtqueue[idx]; if (vq->desc && vq->avail && vq->used) xd->vu_vhost_dev.virtqueue[idx]->enabled = enable; -- cgit 1.2.3-korg