diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/vnet.am | 10 | ||||
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user.c (renamed from src/vnet/devices/virtio/vhost-user.c) | 1548 | ||||
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user.h (renamed from src/vnet/devices/virtio/vhost-user.h) | 40 | ||||
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user_api.c | 2 | ||||
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user_inline.h | 262 | ||||
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user_input.c | 678 | ||||
| -rw-r--r-- | src/vnet/devices/virtio/vhost_user_output.c | 671 |
7 files changed, 1675 insertions, 1536 deletions
diff --git a/src/vnet.am b/src/vnet.am index d6a5d524e53..040a4cd4b6a 100644 --- a/src/vnet.am +++ b/src/vnet.am @@ -917,16 +917,22 @@ API_FILES += vnet/pg/pg.api libvnet_la_SOURCES += \ vnet/devices/virtio/device.c \ vnet/devices/virtio/node.c \ - vnet/devices/virtio/vhost-user.c \ + vnet/devices/virtio/vhost_user.c \ + vnet/devices/virtio/vhost_user_input.c \ + vnet/devices/virtio/vhost_user_output.c \ vnet/devices/virtio/vhost_user_api.c \ vnet/devices/virtio/virtio.c nobase_include_HEADERS += \ vnet/devices/virtio/virtio.h \ - vnet/devices/virtio/vhost-user.h \ + vnet/devices/virtio/vhost_user.h \ vnet/devices/virtio/vhost_user.api.h +libvnet_multiversioning_sources += \ + vnet/devices/virtio/vhost_user_input.c \ + vnet/devices/virtio/vhost_user_output.c + API_FILES += vnet/devices/virtio/vhost_user.api ######################################## diff --git a/src/vnet/devices/virtio/vhost-user.c b/src/vnet/devices/virtio/vhost_user.c index f6406d469b2..a8a7ae89065 100644 --- a/src/vnet/devices/virtio/vhost-user.c +++ b/src/vnet/devices/virtio/vhost_user.c @@ -2,7 +2,7 @@ *------------------------------------------------------------------ * vhost.c - vhost-user * - * Copyright (c) 2014 Cisco and/or its affiliates. + * Copyright (c) 2014-2018 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: @@ -39,7 +39,8 @@ #include <vnet/devices/devices.h> #include <vnet/feature/feature.h> -#include <vnet/devices/virtio/vhost-user.h> +#include <vnet/devices/virtio/vhost_user.h> +#include <vnet/devices/virtio/vhost_user_inline.h> /** * @file @@ -49,122 +50,10 @@ */ -#define VHOST_DEBUG_VQ 0 - -#define DBG_SOCK(args...) \ - { \ - vhost_user_main_t *_vum = &vhost_user_main; \ - if (_vum->debug) \ - clib_warning(args); \ - }; - -#if VHOST_DEBUG_VQ == 1 -#define DBG_VQ(args...) clib_warning(args); -#else -#define DBG_VQ(args...) -#endif - -/* - * When an RX queue is down but active, received packets - * must be discarded. This value controls up to how many - * packets will be discarded during each round. - */ -#define VHOST_USER_DOWN_DISCARD_COUNT 256 - -/* - * When the number of available buffers gets under this threshold, - * RX node will start discarding packets. - */ -#define VHOST_USER_RX_BUFFER_STARVATION 32 - -/* - * On the receive side, the host should free descriptors as soon - * as possible in order to avoid TX drop in the VM. - * This value controls the number of copy operations that are stacked - * before copy is done for all and descriptors are given back to - * the guest. - * The value 64 was obtained by testing (48 and 128 were not as good). - */ -#define VHOST_USER_RX_COPY_THRESHOLD 64 -/* - * On the transmit side, we keep processing the buffers from vlib in the while - * loop and prepare the copy order to be executed later. However, the static - * array which we keep the copy order is limited to VHOST_USER_COPY_ARRAY_N - * entries. In order to not corrupt memory, we have to do the copy when the - * static array reaches the copy threshold. We subtract 40 in case the code - * goes into the inner loop for a maximum of 64k frames which may require - * more array entries. - */ -#define VHOST_USER_TX_COPY_THRESHOLD (VHOST_USER_COPY_ARRAY_N - 40) - -#define UNIX_GET_FD(unixfd_idx) ({ \ - typeof(unixfd_idx) __unixfd_idx = (unixfd_idx); \ - (__unixfd_idx != ~0) ? \ - pool_elt_at_index (file_main.file_pool, \ - __unixfd_idx)->file_descriptor : -1; }) - -#define foreach_virtio_trace_flags \ - _ (SIMPLE_CHAINED, 0, "Simple descriptor chaining") \ - _ (SINGLE_DESC, 1, "Single descriptor packet") \ - _ (INDIRECT, 2, "Indirect descriptor") \ - _ (MAP_ERROR, 4, "Memory mapping error") - -typedef enum -{ -#define _(n,i,s) VIRTIO_TRACE_F_##n, - foreach_virtio_trace_flags -#undef _ -} virtio_trace_flag_t; - -vlib_node_registration_t vhost_user_input_node; - -#define foreach_vhost_user_tx_func_error \ - _(NONE, "no error") \ - _(NOT_READY, "vhost vring not ready") \ - _(DOWN, "vhost interface is down") \ - _(PKT_DROP_NOBUF, "tx packet drops (no available descriptors)") \ - _(PKT_DROP_NOMRG, "tx packet drops (cannot merge descriptors)") \ - _(MMAP_FAIL, "mmap failure") \ - _(INDIRECT_OVERFLOW, "indirect descriptor table overflow") - -typedef enum -{ -#define _(f,s) VHOST_USER_TX_FUNC_ERROR_##f, - foreach_vhost_user_tx_func_error -#undef _ - VHOST_USER_TX_FUNC_N_ERROR, -} vhost_user_tx_func_error_t; - -static char *vhost_user_tx_func_error_strings[] = { -#define _(n,s) s, - foreach_vhost_user_tx_func_error -#undef _ -}; - -#define foreach_vhost_user_input_func_error \ - _(NO_ERROR, "no error") \ - _(NO_BUFFER, "no available buffer") \ - _(MMAP_FAIL, "mmap failure") \ - _(INDIRECT_OVERFLOW, "indirect descriptor overflows table") \ - _(UNDERSIZED_FRAME, "undersized ethernet frame received (< 14 bytes)") \ - _(FULL_RX_QUEUE, "full rx queue (possible driver tx drop)") - -typedef enum -{ -#define _(f,s) VHOST_USER_INPUT_FUNC_ERROR_##f, - foreach_vhost_user_input_func_error -#undef _ - VHOST_USER_INPUT_FUNC_N_ERROR, -} vhost_user_input_func_error_t; - -static char *vhost_user_input_func_error_strings[] = { -#define _(n,s) s, - foreach_vhost_user_input_func_error -#undef _ -}; +vlib_node_registration_t vhost_user_send_interrupt_node; /* *INDENT-OFF* */ -static vhost_user_main_t vhost_user_main = { +vhost_user_main_t vhost_user_main = { .mtu_bytes = 1518, }; @@ -173,195 +62,6 @@ VNET_HW_INTERFACE_CLASS (vhost_interface_class, static) = { }; /* *INDENT-ON* */ -static u8 * -format_vhost_user_interface_name (u8 * s, va_list * args) -{ - u32 i = va_arg (*args, u32); - u32 show_dev_instance = ~0; - vhost_user_main_t *vum = &vhost_user_main; - - if (i < vec_len (vum->show_dev_instance_by_real_dev_instance)) - show_dev_instance = vum->show_dev_instance_by_real_dev_instance[i]; - - if (show_dev_instance != ~0) - i = show_dev_instance; - - s = format (s, "VirtualEthernet0/0/%d", i); - return s; -} - -static int -vhost_user_name_renumber (vnet_hw_interface_t * hi, u32 new_dev_instance) -{ - // FIXME: check if the new dev instance is already used - vhost_user_main_t *vum = &vhost_user_main; - vec_validate_init_empty (vum->show_dev_instance_by_real_dev_instance, - hi->dev_instance, ~0); - - vum->show_dev_instance_by_real_dev_instance[hi->dev_instance] = - new_dev_instance; - - DBG_SOCK ("renumbered vhost-user interface dev_instance %d to %d", - hi->dev_instance, new_dev_instance); - - return 0; -} - -static_always_inline void * -map_guest_mem (vhost_user_intf_t * vui, uword addr, u32 * hint) -{ - int i = *hint; - if (PREDICT_TRUE ((vui->regions[i].guest_phys_addr <= addr) && - ((vui->regions[i].guest_phys_addr + - vui->regions[i].memory_size) > addr))) - { - return (void *) (vui->region_mmap_addr[i] + addr - - vui->regions[i].guest_phys_addr); - } -#if __SSE4_2__ - __m128i rl, rh, al, ah, r; - al = _mm_set1_epi64x (addr + 1); - ah = _mm_set1_epi64x (addr); - - rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[0]); - rl = _mm_cmpgt_epi64 (al, rl); - rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[0]); - rh = _mm_cmpgt_epi64 (rh, ah); - r = _mm_and_si128 (rl, rh); - - rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[2]); - rl = _mm_cmpgt_epi64 (al, rl); - rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[2]); - rh = _mm_cmpgt_epi64 (rh, ah); - r = _mm_blend_epi16 (r, _mm_and_si128 (rl, rh), 0x22); - - rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[4]); - rl = _mm_cmpgt_epi64 (al, rl); - rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[4]); - rh = _mm_cmpgt_epi64 (rh, ah); - r = _mm_blend_epi16 (r, _mm_and_si128 (rl, rh), 0x44); - - rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[6]); - rl = _mm_cmpgt_epi64 (al, rl); - rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[6]); - rh = _mm_cmpgt_epi64 (rh, ah); - r = _mm_blend_epi16 (r, _mm_and_si128 (rl, rh), 0x88); - - r = _mm_shuffle_epi8 (r, _mm_set_epi64x (0, 0x0e060c040a020800)); - i = count_trailing_zeros (_mm_movemask_epi8 (r) | - (1 << VHOST_MEMORY_MAX_NREGIONS)); - - if (i < vui->nregions) - { - *hint = i; - return (void *) (vui->region_mmap_addr[i] + addr - - vui->regions[i].guest_phys_addr); - } -#elif __aarch64__ && __ARM_NEON - uint64x2_t al, ah, rl, rh, r; - uint32_t u32 = 0; - - al = vdupq_n_u64 (addr + 1); - ah = vdupq_n_u64 (addr); - - /*First Iteration */ - rl = vld1q_u64 (&vui->region_guest_addr_lo[0]); - rl = vcgtq_u64 (al, rl); - rh = vld1q_u64 (&vui->region_guest_addr_hi[0]); - rh = vcgtq_u64 (rh, ah); - r = vandq_u64 (rl, rh); - u32 |= (vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 0) & 0x1); - u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 8) & 0x1) << 1); - - if (u32) - { - i = count_trailing_zeros (u32); - goto vhost_map_guest_mem_done; - } - - /*Second Iteration */ - rl = vld1q_u64 (&vui->region_guest_addr_lo[2]); - rl = vcgtq_u64 (al, rl); - rh = vld1q_u64 (&vui->region_guest_addr_hi[2]); - rh = vcgtq_u64 (rh, ah); - r = vandq_u64 (rl, rh); - u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 0) & 0x1) << 2); - u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 8) & 0x1) << 3); - - if (u32) - { - i = count_trailing_zeros (u32); - goto vhost_map_guest_mem_done; - } - - /*Third Iteration */ - rl = vld1q_u64 (&vui->region_guest_addr_lo[4]); - rl = vcgtq_u64 (al, rl); - rh = vld1q_u64 (&vui->region_guest_addr_hi[4]); - rh = vcgtq_u64 (rh, ah); - r = vandq_u64 (rl, rh); - u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 0) & 0x1) << 4); - u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 8) & 0x1) << 5); - - if (u32) - { - i = count_trailing_zeros (u32); - goto vhost_map_guest_mem_done; - } - - /*Fourth Iteration */ - rl = vld1q_u64 (&vui->region_guest_addr_lo[6]); - rl = vcgtq_u64 (al, rl); - rh = vld1q_u64 (&vui->region_guest_addr_hi[6]); - rh = vcgtq_u64 (rh, ah); - r = vandq_u64 (rl, rh); - u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 0) & 0x1) << 6); - u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 8) & 0x1) << 7); - - i = count_trailing_zeros (u32 | (1 << VHOST_MEMORY_MAX_NREGIONS)); - -vhost_map_guest_mem_done: - if (i < vui->nregions) - { - *hint = i; - return (void *) (vui->region_mmap_addr[i] + addr - - vui->regions[i].guest_phys_addr); - } -#else - for (i = 0; i < vui->nregions; i++) - { - if ((vui->regions[i].guest_phys_addr <= addr) && - ((vui->regions[i].guest_phys_addr + vui->regions[i].memory_size) > - addr)) - { - *hint = i; - return (void *) (vui->region_mmap_addr[i] + addr - - vui->regions[i].guest_phys_addr); - } - } -#endif - DBG_VQ ("failed to map guest mem addr %llx", addr); - *hint = 0; - return 0; -} - -static inline void * -map_user_mem (vhost_user_intf_t * vui, uword addr) -{ - int i; - for (i = 0; i < vui->nregions; i++) - { - if ((vui->regions[i].userspace_addr <= addr) && - ((vui->regions[i].userspace_addr + vui->regions[i].memory_size) > - addr)) - { - return (void *) (vui->region_mmap_addr[i] + addr - - vui->regions[i].userspace_addr); - } - } - return 0; -} - static long get_huge_page_size (int fd) { @@ -510,7 +210,7 @@ vhost_user_rx_thread_placement () } /** @brief Returns whether at least one TX and one RX vring are enabled */ -int +static_always_inline int vhost_user_intf_ready (vhost_user_intf_t * vui) { int i, found[2] = { }; //RX + TX @@ -592,36 +292,7 @@ vhost_user_kickfd_read_ready (clib_file_t * uf) return 0; } -/** - * @brief Try once to lock the vring - * @return 0 on success, non-zero on failure. - */ -static inline int -vhost_user_vring_try_lock (vhost_user_intf_t * vui, u32 qid) -{ - return __sync_lock_test_and_set (vui->vring_locks[qid], 1); -} - -/** - * @brief Spin until the vring is successfully locked - */ -static inline void -vhost_user_vring_lock (vhost_user_intf_t * vui, u32 qid) -{ - while (vhost_user_vring_try_lock (vui, qid)) - ; -} - -/** - * @brief Unlock the vring lock - */ -static inline void -vhost_user_vring_unlock (vhost_user_intf_t * vui, u32 qid) -{ - *vui->vring_locks[qid] = 0; -} - -static inline void +static_always_inline void vhost_user_vring_init (vhost_user_intf_t * vui, u32 qid) { vhost_user_vring_t *vring = &vui->vrings[qid]; @@ -643,7 +314,7 @@ vhost_user_vring_init (vhost_user_intf_t * vui, u32 qid) vring->enabled = 1; } -static inline void +static_always_inline void vhost_user_vring_close (vhost_user_intf_t * vui, u32 qid) { vhost_user_vring_t *vring = &vui->vrings[qid]; @@ -669,7 +340,7 @@ vhost_user_vring_close (vhost_user_intf_t * vui, u32 qid) vhost_user_vring_init (vui, qid); } -static inline void +static_always_inline void vhost_user_if_disconnect (vhost_user_intf_t * vui) { vnet_main_t *vnm = vnet_get_main (); @@ -692,47 +363,6 @@ vhost_user_if_disconnect (vhost_user_intf_t * vui) DBG_SOCK ("interface ifindex %d disconnected", vui->sw_if_index); } -#define VHOST_LOG_PAGE 0x1000 -static_always_inline void -vhost_user_log_dirty_pages_2 (vhost_user_intf_t * vui, - u64 addr, u64 len, u8 is_host_address) -{ - if (PREDICT_TRUE (vui->log_base_addr == 0 - || !(vui->features & (1 << FEAT_VHOST_F_LOG_ALL)))) - { - return; - } - if (is_host_address) - { - addr = pointer_to_uword (map_user_mem (vui, (uword) addr)); - } - if (PREDICT_FALSE ((addr + len - 1) / VHOST_LOG_PAGE / 8 >= vui->log_size)) - { - DBG_SOCK ("vhost_user_log_dirty_pages(): out of range\n"); - return; - } - - CLIB_MEMORY_BARRIER (); - u64 page = addr / VHOST_LOG_PAGE; - while (page * VHOST_LOG_PAGE < addr + len) - { - ((u8 *) vui->log_base_addr)[page / 8] |= 1 << page % 8; - page++; - } -} - -static_always_inline void -vhost_user_log_dirty_pages (vhost_user_intf_t * vui, u64 addr, u64 len) -{ - vhost_user_log_dirty_pages_2 (vui, addr, len, 0); -} - -#define vhost_user_log_dirty_ring(vui, vq, member) \ - if (PREDICT_FALSE(vq->log_used)) { \ - vhost_user_log_dirty_pages(vui, vq->log_guest_addr + STRUCT_OFFSET_OF(vring_used_t, member), \ - sizeof(vq->used->member)); \ - } - static clib_error_t * vhost_user_socket_read (clib_file_t * uf) { @@ -1333,1056 +963,6 @@ vhost_user_init (vlib_main_t * vm) VLIB_INIT_FUNCTION (vhost_user_init); -static u8 * -format_vhost_trace (u8 * s, va_list * va) -{ - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); - CLIB_UNUSED (vnet_main_t * vnm) = vnet_get_main (); - vhost_user_main_t *vum = &vhost_user_main; - vhost_trace_t *t = va_arg (*va, vhost_trace_t *); - vhost_user_intf_t *vui = pool_elt_at_index (vum->vhost_user_interfaces, - t->device_index); - - vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, vui->sw_if_index); - - u32 indent = format_get_indent (s); - - s = format (s, "%U %U queue %d\n", format_white_space, indent, - format_vnet_sw_interface_name, vnm, sw, t->qid); - - s = format (s, "%U virtio flags:\n", format_white_space, indent); -#define _(n,i,st) \ - if (t->virtio_ring_flags & (1 << VIRTIO_TRACE_F_##n)) \ - s = format (s, "%U %s %s\n", format_white_space, indent, #n, st); - foreach_virtio_trace_flags -#undef _ - s = format (s, "%U virtio_net_hdr first_desc_len %u\n", - format_white_space, indent, t->first_desc_len); - - s = format (s, "%U flags 0x%02x gso_type %u\n", - format_white_space, indent, - t->hdr.hdr.flags, t->hdr.hdr.gso_type); - - if (vui->virtio_net_hdr_sz == 12) - s = format (s, "%U num_buff %u", - format_white_space, indent, t->hdr.num_buffers); - - return s; -} - -void -vhost_user_rx_trace (vhost_trace_t * t, - vhost_user_intf_t * vui, u16 qid, - vlib_buffer_t * b, vhost_user_vring_t * txvq) -{ - vhost_user_main_t *vum = &vhost_user_main; - u32 last_avail_idx = txvq->last_avail_idx; - u32 desc_current = txvq->avail->ring[last_avail_idx & txvq->qsz_mask]; - vring_desc_t *hdr_desc = 0; - virtio_net_hdr_mrg_rxbuf_t *hdr; - u32 hint = 0; - - memset (t, 0, sizeof (*t)); - t->device_index = vui - vum->vhost_user_interfaces; - t->qid = qid; - - hdr_desc = &txvq->desc[desc_current]; - if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; - /* Header is the first here */ - hdr_desc = map_guest_mem (vui, txvq->desc[desc_current].addr, &hint); - } - if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; - } - if (!(txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) && - !(txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; - } - - t->first_desc_len = hdr_desc ? hdr_desc->len : 0; - - if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint))) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR; - } - else - { - u32 len = vui->virtio_net_hdr_sz; - memcpy (&t->hdr, hdr, len > hdr_desc->len ? hdr_desc->len : len); - } -} - -static inline void -vhost_user_send_call (vlib_main_t * vm, vhost_user_vring_t * vq) -{ - vhost_user_main_t *vum = &vhost_user_main; - u64 x = 1; - int fd = UNIX_GET_FD (vq->callfd_idx); - int rv; - - rv = write (fd, &x, sizeof (x)); - if (rv <= 0) - { - clib_unix_warning - ("Error: Could not write to unix socket for callfd %d", fd); - return; - } - - vq->n_since_last_int = 0; - vq->int_deadline = vlib_time_now (vm) + vum->coalesce_time; -} - -static_always_inline u32 -vhost_user_input_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy, - u16 copy_len, u32 * map_hint) -{ - void *src0, *src1, *src2, *src3; - if (PREDICT_TRUE (copy_len >= 4)) - { - if (PREDICT_FALSE (!(src2 = map_guest_mem (vui, cpy[0].src, map_hint)))) - return 1; - if (PREDICT_FALSE (!(src3 = map_guest_mem (vui, cpy[1].src, map_hint)))) - return 1; - - while (PREDICT_TRUE (copy_len >= 4)) - { - src0 = src2; - src1 = src3; - - if (PREDICT_FALSE - (!(src2 = map_guest_mem (vui, cpy[2].src, map_hint)))) - return 1; - if (PREDICT_FALSE - (!(src3 = map_guest_mem (vui, cpy[3].src, map_hint)))) - return 1; - - CLIB_PREFETCH (src2, 64, LOAD); - CLIB_PREFETCH (src3, 64, LOAD); - - clib_memcpy ((void *) cpy[0].dst, src0, cpy[0].len); - clib_memcpy ((void *) cpy[1].dst, src1, cpy[1].len); - copy_len -= 2; - cpy += 2; - } - } - while (copy_len) - { - if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint)))) - return 1; - clib_memcpy ((void *) cpy->dst, src0, cpy->len); - copy_len -= 1; - cpy += 1; - } - return 0; -} - -/** - * Try to discard packets from the tx ring (VPP RX path). - * Returns the number of discarded packets. - */ -u32 -vhost_user_rx_discard_packet (vlib_main_t * vm, - vhost_user_intf_t * vui, - vhost_user_vring_t * txvq, u32 discard_max) -{ - /* - * On the RX side, each packet corresponds to one descriptor - * (it is the same whether it is a shallow descriptor, chained, or indirect). - * Therefore, discarding a packet is like discarding a descriptor. - */ - u32 discarded_packets = 0; - u32 avail_idx = txvq->avail->idx; - while (discarded_packets != discard_max) - { - if (avail_idx == txvq->last_avail_idx) - goto out; - - u16 desc_chain_head = - txvq->avail->ring[txvq->last_avail_idx & txvq->qsz_mask]; - txvq->last_avail_idx++; - txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].id = - desc_chain_head; - txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].len = 0; - vhost_user_log_dirty_ring (vui, txvq, - ring[txvq->last_used_idx & txvq->qsz_mask]); - txvq->last_used_idx++; - discarded_packets++; - } - -out: - CLIB_MEMORY_BARRIER (); - txvq->used->idx = txvq->last_used_idx; - vhost_user_log_dirty_ring (vui, txvq, idx); - return discarded_packets; -} - -/* - * In case of overflow, we need to rewind the array of allocated buffers. - */ -static void -vhost_user_input_rewind_buffers (vlib_main_t * vm, - vhost_cpu_t * cpu, vlib_buffer_t * b_head) -{ - u32 bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; - vlib_buffer_t *b_current = vlib_get_buffer (vm, bi_current); - b_current->current_length = 0; - b_current->flags = 0; - while (b_current != b_head) - { - cpu->rx_buffers_len++; - bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; - b_current = vlib_get_buffer (vm, bi_current); - b_current->current_length = 0; - b_current->flags = 0; - } - cpu->rx_buffers_len++; -} - -static u32 -vhost_user_if_input (vlib_main_t * vm, - vhost_user_main_t * vum, - vhost_user_intf_t * vui, - u16 qid, vlib_node_runtime_t * node, - vnet_hw_interface_rx_mode mode) -{ - vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; - u16 n_rx_packets = 0; - u32 n_rx_bytes = 0; - u16 n_left; - u32 n_left_to_next, *to_next; - u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; - u32 n_trace = vlib_get_trace_count (vm, node); - u32 map_hint = 0; - u16 thread_index = vlib_get_thread_index (); - u16 copy_len = 0; - - { - /* do we have pending interrupts ? */ - vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)]; - f64 now = vlib_time_now (vm); - - if ((txvq->n_since_last_int) && (txvq->int_deadline < now)) - vhost_user_send_call (vm, txvq); - - if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now)) - vhost_user_send_call (vm, rxvq); - } - - /* - * For adaptive mode, it is optimized to reduce interrupts. - * If the scheduler switches the input node to polling due - * to burst of traffic, we tell the driver no interrupt. - * When the traffic subsides, the scheduler switches the node back to - * interrupt mode. We must tell the driver we want interrupt. - */ - if (PREDICT_FALSE (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE)) - { - if ((node->flags & - VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) || - !(node->flags & - VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE)) - /* Tell driver we want notification */ - txvq->used->flags = 0; - else - /* Tell driver we don't want notification */ - txvq->used->flags = VRING_USED_F_NO_NOTIFY; - } - - if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE)) - return 0; - - n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx); - - /* nothing to do */ - if (PREDICT_FALSE (n_left == 0)) - return 0; - - if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled))) - { - /* - * Discard input packet if interface is admin down or vring is not - * enabled. - * "For example, for a networking device, in the disabled state - * client must not supply any new RX packets, but must process - * and discard any TX packets." - */ - vhost_user_rx_discard_packet (vm, vui, txvq, - VHOST_USER_DOWN_DISCARD_COUNT); - return 0; - } - - if (PREDICT_FALSE (n_left == (txvq->qsz_mask + 1))) - { - /* - * Informational error logging when VPP is not - * receiving packets fast enough. - */ - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_FULL_RX_QUEUE, 1); - } - - if (n_left > VLIB_FRAME_SIZE) - n_left = VLIB_FRAME_SIZE; - - /* - * For small packets (<2kB), we will not need more than one vlib buffer - * per packet. In case packets are bigger, we will just yeld at some point - * in the loop and come back later. This is not an issue as for big packet, - * processing cost really comes from the memory copy. - * The assumption is that big packets will fit in 40 buffers. - */ - if (PREDICT_FALSE (vum->cpus[thread_index].rx_buffers_len < n_left + 1 || - vum->cpus[thread_index].rx_buffers_len < 40)) - { - u32 curr_len = vum->cpus[thread_index].rx_buffers_len; - vum->cpus[thread_index].rx_buffers_len += - vlib_buffer_alloc_from_free_list (vm, - vum->cpus[thread_index].rx_buffers + - curr_len, - VHOST_USER_RX_BUFFERS_N - curr_len, - VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); - - if (PREDICT_FALSE - (vum->cpus[thread_index].rx_buffers_len < - VHOST_USER_RX_BUFFER_STARVATION)) - { - /* In case of buffer starvation, discard some packets from the queue - * and log the event. - * We keep doing best effort for the remaining packets. */ - u32 flush = (n_left + 1 > vum->cpus[thread_index].rx_buffers_len) ? - n_left + 1 - vum->cpus[thread_index].rx_buffers_len : 1; - flush = vhost_user_rx_discard_packet (vm, vui, txvq, flush); - - n_left -= flush; - vlib_increment_simple_counter (vnet_main. - interface_main.sw_if_counters + - VNET_INTERFACE_COUNTER_DROP, - vlib_get_thread_index (), - vui->sw_if_index, flush); - - vlib_error_count (vm, vhost_user_input_node.index, - VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, flush); - } - } - - while (n_left > 0) - { - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (n_left > 0 && n_left_to_next > 0) - { - vlib_buffer_t *b_head, *b_current; - u32 bi_current; - u16 desc_current; - u32 desc_data_offset; - vring_desc_t *desc_table = txvq->desc; - - if (PREDICT_FALSE (vum->cpus[thread_index].rx_buffers_len <= 1)) - { - /* Not enough rx_buffers - * Note: We yeld on 1 so we don't need to do an additional - * check for the next buffer prefetch. - */ - n_left = 0; - break; - } - - desc_current = - txvq->avail->ring[txvq->last_avail_idx & txvq->qsz_mask]; - vum->cpus[thread_index].rx_buffers_len--; - bi_current = (vum->cpus[thread_index].rx_buffers) - [vum->cpus[thread_index].rx_buffers_len]; - b_head = b_current = vlib_get_buffer (vm, bi_current); - to_next[0] = bi_current; //We do that now so we can forget about bi_current - to_next++; - n_left_to_next--; - - vlib_prefetch_buffer_with_index (vm, - (vum-> - cpus[thread_index].rx_buffers) - [vum->cpus[thread_index]. - rx_buffers_len - 1], LOAD); - - /* Just preset the used descriptor id and length for later */ - txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].id = - desc_current; - txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].len = 0; - vhost_user_log_dirty_ring (vui, txvq, - ring[txvq->last_used_idx & - txvq->qsz_mask]); - - /* The buffer should already be initialized */ - b_head->total_length_not_including_first_buffer = 0; - b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; - - if (PREDICT_FALSE (n_trace)) - { - //TODO: next_index is not exactly known at that point - vlib_trace_buffer (vm, node, next_index, b_head, - /* follow_chain */ 0); - vhost_trace_t *t0 = - vlib_add_trace (vm, node, b_head, sizeof (t0[0])); - vhost_user_rx_trace (t0, vui, qid, b_head, txvq); - n_trace--; - vlib_set_trace_count (vm, node, n_trace); - } - - /* This depends on the setup but is very consistent - * So I think the CPU branch predictor will make a pretty good job - * at optimizing the decision. */ - if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT) - { - desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr, - &map_hint); - desc_current = 0; - if (PREDICT_FALSE (desc_table == 0)) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - goto out; - } - } - - if (PREDICT_TRUE (vui->is_any_layout) || - (!(desc_table[desc_current].flags & VIRTQ_DESC_F_NEXT))) - { - /* ANYLAYOUT or single buffer */ - desc_data_offset = vui->virtio_net_hdr_sz; - } - else - { - /* CSR case without ANYLAYOUT, skip 1st buffer */ - desc_data_offset = desc_table[desc_current].len; - } - - while (1) - { - /* Get more input if necessary. Or end of packet. */ - if (desc_data_offset == desc_table[desc_current].len) - { - if (PREDICT_FALSE (desc_table[desc_current].flags & - VIRTQ_DESC_F_NEXT)) - { - desc_current = desc_table[desc_current].next; - desc_data_offset = 0; - } - else - { - goto out; - } - } - - /* Get more output if necessary. Or end of packet. */ - if (PREDICT_FALSE - (b_current->current_length == VLIB_BUFFER_DATA_SIZE)) - { - if (PREDICT_FALSE - (vum->cpus[thread_index].rx_buffers_len == 0)) - { - /* Cancel speculation */ - to_next--; - n_left_to_next++; - - /* - * Checking if there are some left buffers. - * If not, just rewind the used buffers and stop. - * Note: Scheduled copies are not cancelled. This is - * not an issue as they would still be valid. Useless, - * but valid. - */ - vhost_user_input_rewind_buffers (vm, - &vum->cpus - [thread_index], - b_head); - n_left = 0; - goto stop; - } - - /* Get next output */ - vum->cpus[thread_index].rx_buffers_len--; - u32 bi_next = - (vum->cpus[thread_index].rx_buffers)[vum->cpus - [thread_index].rx_buffers_len]; - b_current->next_buffer = bi_next; - b_current->flags |= VLIB_BUFFER_NEXT_PRESENT; - bi_current = bi_next; - b_current = vlib_get_buffer (vm, bi_current); - } - - /* Prepare a copy order executed later for the data */ - vhost_copy_t *cpy = &vum->cpus[thread_index].copy[copy_len]; - copy_len++; - u32 desc_data_l = - desc_table[desc_current].len - desc_data_offset; - cpy->len = VLIB_BUFFER_DATA_SIZE - b_current->current_length; - cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len; - cpy->dst = (uword) (vlib_buffer_get_current (b_current) + - b_current->current_length); - cpy->src = desc_table[desc_current].addr + desc_data_offset; - - desc_data_offset += cpy->len; - - b_current->current_length += cpy->len; - b_head->total_length_not_including_first_buffer += cpy->len; - } - - out: - CLIB_PREFETCH (&n_left, sizeof (n_left), LOAD); - - n_rx_bytes += b_head->total_length_not_including_first_buffer; - n_rx_packets++; - - b_head->total_length_not_including_first_buffer -= - b_head->current_length; - - /* consume the descriptor and return it as used */ - txvq->last_avail_idx++; - txvq->last_used_idx++; - - VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head); - - vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index; - vnet_buffer (b_head)->sw_if_index[VLIB_TX] = (u32) ~ 0; - b_head->error = 0; - - { - u32 next0 = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; - - /* redirect if feature path enabled */ - vnet_feature_start_device_input_x1 (vui->sw_if_index, &next0, - b_head); - - u32 bi = to_next[-1]; //Cannot use to_next[-1] in the macro - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, - bi, next0); - } - - n_left--; - - /* - * Although separating memory copies from virtio ring parsing - * is beneficial, we can offer to perform the copies from time - * to time in order to free some space in the ring. - */ - if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD)) - { - if (PREDICT_FALSE - (vhost_user_input_copy (vui, vum->cpus[thread_index].copy, - copy_len, &map_hint))) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - } - copy_len = 0; - - /* give buffers back to driver */ - CLIB_MEMORY_BARRIER (); - txvq->used->idx = txvq->last_used_idx; - vhost_user_log_dirty_ring (vui, txvq, idx); - } - } - stop: - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - /* Do the memory copies */ - if (PREDICT_FALSE - (vhost_user_input_copy (vui, vum->cpus[thread_index].copy, - copy_len, &map_hint))) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); - } - - /* give buffers back to driver */ - CLIB_MEMORY_BARRIER (); - txvq->used->idx = txvq->last_used_idx; - vhost_user_log_dirty_ring (vui, txvq, idx); - - /* interrupt (call) handling */ - if ((txvq->callfd_idx != ~0) && - !(txvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) - { - txvq->n_since_last_int += n_rx_packets; - - if (txvq->n_since_last_int > vum->coalesce_frames) - vhost_user_send_call (vm, txvq); - } - - /* increase rx counters */ - vlib_increment_combined_counter - (vnet_main.interface_main.combined_sw_if_counters - + VNET_INTERFACE_COUNTER_RX, - vlib_get_thread_index (), vui->sw_if_index, n_rx_packets, n_rx_bytes); - - vnet_device_increment_rx_packets (thread_index, n_rx_packets); - - return n_rx_packets; -} - -static uword -vhost_user_input (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * f) -{ - vhost_user_main_t *vum = &vhost_user_main; - uword n_rx_packets = 0; - vhost_user_intf_t *vui; - vnet_device_input_runtime_t *rt = - (vnet_device_input_runtime_t *) node->runtime_data; - vnet_device_and_queue_t *dq; - - vec_foreach (dq, rt->devices_and_queues) - { - if (clib_smp_swap (&dq->interrupt_pending, 0) || - (node->state == VLIB_NODE_STATE_POLLING)) - { - vui = - pool_elt_at_index (vum->vhost_user_interfaces, dq->dev_instance); - n_rx_packets = vhost_user_if_input (vm, vum, vui, dq->queue_id, node, - dq->mode); - } - } - - return n_rx_packets; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (vhost_user_input_node) = { - .function = vhost_user_input, - .type = VLIB_NODE_TYPE_INPUT, - .name = "vhost-user-input", - .sibling_of = "device-input", - - /* Will be enabled if/when hardware is detected. */ - .state = VLIB_NODE_STATE_DISABLED, - - .format_buffer = format_ethernet_header_with_length, - .format_trace = format_vhost_trace, - - .n_errors = VHOST_USER_INPUT_FUNC_N_ERROR, - .error_strings = vhost_user_input_func_error_strings, -}; - -VLIB_NODE_FUNCTION_MULTIARCH (vhost_user_input_node, vhost_user_input) -/* *INDENT-ON* */ - - -void -vhost_user_tx_trace (vhost_trace_t * t, - vhost_user_intf_t * vui, u16 qid, - vlib_buffer_t * b, vhost_user_vring_t * rxvq) -{ - vhost_user_main_t *vum = &vhost_user_main; - u32 last_avail_idx = rxvq->last_avail_idx; - u32 desc_current = rxvq->avail->ring[last_avail_idx & rxvq->qsz_mask]; - vring_desc_t *hdr_desc = 0; - u32 hint = 0; - - memset (t, 0, sizeof (*t)); - t->device_index = vui - vum->vhost_user_interfaces; - t->qid = qid; - - hdr_desc = &rxvq->desc[desc_current]; - if (rxvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; - /* Header is the first here */ - hdr_desc = map_guest_mem (vui, rxvq->desc[desc_current].addr, &hint); - } - if (rxvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; - } - if (!(rxvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) && - !(rxvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)) - { - t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; - } - - t->first_desc_len = hdr_desc ? hdr_desc->len : 0; -} - -static_always_inline u32 -vhost_user_tx_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy, - u16 copy_len, u32 * map_hint) -{ - void *dst0, *dst1, *dst2, *dst3; - if (PREDICT_TRUE (copy_len >= 4)) - { - if (PREDICT_FALSE (!(dst2 = map_guest_mem (vui, cpy[0].dst, map_hint)))) - return 1; - if (PREDICT_FALSE (!(dst3 = map_guest_mem (vui, cpy[1].dst, map_hint)))) - return 1; - while (PREDICT_TRUE (copy_len >= 4)) - { - dst0 = dst2; - dst1 = dst3; - - if (PREDICT_FALSE - (!(dst2 = map_guest_mem (vui, cpy[2].dst, map_hint)))) - return 1; - if (PREDICT_FALSE - (!(dst3 = map_guest_mem (vui, cpy[3].dst, map_hint)))) - return 1; - - CLIB_PREFETCH ((void *) cpy[2].src, 64, LOAD); - CLIB_PREFETCH ((void *) cpy[3].src, 64, LOAD); - - clib_memcpy (dst0, (void *) cpy[0].src, cpy[0].len); - clib_memcpy (dst1, (void *) cpy[1].src, cpy[1].len); - - vhost_user_log_dirty_pages_2 (vui, cpy[0].dst, cpy[0].len, 1); - vhost_user_log_dirty_pages_2 (vui, cpy[1].dst, cpy[1].len, 1); - copy_len -= 2; - cpy += 2; - } - } - while (copy_len) - { - if (PREDICT_FALSE (!(dst0 = map_guest_mem (vui, cpy->dst, map_hint)))) - return 1; - clib_memcpy (dst0, (void *) cpy->src, cpy->len); - vhost_user_log_dirty_pages_2 (vui, cpy->dst, cpy->len, 1); - copy_len -= 1; - cpy += 1; - } - return 0; -} - - -static uword -vhost_user_tx (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame) -{ - u32 *buffers = vlib_frame_args (frame); - u32 n_left = frame->n_vectors; - vhost_user_main_t *vum = &vhost_user_main; - vnet_interface_output_runtime_t *rd = (void *) node->runtime_data; - vhost_user_intf_t *vui = - pool_elt_at_index (vum->vhost_user_interfaces, rd->dev_instance); - u32 qid = ~0; - vhost_user_vring_t *rxvq; - u8 error; - u32 thread_index = vlib_get_thread_index (); - u32 map_hint = 0; - u8 retry = 8; - u16 copy_len; - u16 tx_headers_len; - - if (PREDICT_FALSE (!vui->admin_up)) - { - error = VHOST_USER_TX_FUNC_ERROR_DOWN; - goto done3; - } - - if (PREDICT_FALSE (!vui->is_up)) - { - error = VHOST_USER_TX_FUNC_ERROR_NOT_READY; - goto done3; - } - - qid = - VHOST_VRING_IDX_RX (*vec_elt_at_index - (vui->per_cpu_tx_qid, thread_index)); - rxvq = &vui->vrings[qid]; - if (PREDICT_FALSE (vui->use_tx_spinlock)) - vhost_user_vring_lock (vui, qid); - -retry: - error = VHOST_USER_TX_FUNC_ERROR_NONE; - tx_headers_len = 0; - copy_len = 0; - while (n_left > 0) - { - vlib_buffer_t *b0, *current_b0; - u16 desc_head, desc_index, desc_len; - vring_desc_t *desc_table; - uword buffer_map_addr; - u32 buffer_len; - u16 bytes_left; - - if (PREDICT_TRUE (n_left > 1)) - vlib_prefetch_buffer_with_index (vm, buffers[1], LOAD); - - b0 = vlib_get_buffer (vm, buffers[0]); - - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - vum->cpus[thread_index].current_trace = - vlib_add_trace (vm, node, b0, - sizeof (*vum->cpus[thread_index].current_trace)); - vhost_user_tx_trace (vum->cpus[thread_index].current_trace, - vui, qid / 2, b0, rxvq); - } - - if (PREDICT_FALSE (rxvq->last_avail_idx == rxvq->avail->idx)) - { - error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; - goto done; - } - - desc_table = rxvq->desc; - desc_head = desc_index = - rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask]; - - /* Go deeper in case of indirect descriptor - * I don't know of any driver providing indirect for RX. */ - if (PREDICT_FALSE (rxvq->desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT)) - { - if (PREDICT_FALSE - (rxvq->desc[desc_head].len < sizeof (vring_desc_t))) - { - error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; - goto done; - } - if (PREDICT_FALSE - (!(desc_table = - map_guest_mem (vui, rxvq->desc[desc_index].addr, - &map_hint)))) - { - error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; - goto done; - } - desc_index = 0; - } - - desc_len = vui->virtio_net_hdr_sz; - buffer_map_addr = desc_table[desc_index].addr; - buffer_len = desc_table[desc_index].len; - - { - // Get a header from the header array - virtio_net_hdr_mrg_rxbuf_t *hdr = - &vum->cpus[thread_index].tx_headers[tx_headers_len]; - tx_headers_len++; - hdr->hdr.flags = 0; - hdr->hdr.gso_type = 0; - hdr->num_buffers = 1; //This is local, no need to check - - // Prepare a copy order executed later for the header - vhost_copy_t *cpy = &vum->cpus[thread_index].copy[copy_len]; - copy_len++; - cpy->len = vui->virtio_net_hdr_sz; - cpy->dst = buffer_map_addr; - cpy->src = (uword) hdr; - } - - buffer_map_addr += vui->virtio_net_hdr_sz; - buffer_len -= vui->virtio_net_hdr_sz; - bytes_left = b0->current_length; - current_b0 = b0; - while (1) - { - if (buffer_len == 0) - { //Get new output - if (desc_table[desc_index].flags & VIRTQ_DESC_F_NEXT) - { - //Next one is chained - desc_index = desc_table[desc_index].next; - buffer_map_addr = desc_table[desc_index].addr; - buffer_len = desc_table[desc_index].len; - } - else if (vui->virtio_net_hdr_sz == 12) //MRG is available - { - virtio_net_hdr_mrg_rxbuf_t *hdr = - &vum->cpus[thread_index].tx_headers[tx_headers_len - 1]; - - //Move from available to used buffer - rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id = - desc_head; - rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len = - desc_len; - vhost_user_log_dirty_ring (vui, rxvq, - ring[rxvq->last_used_idx & - rxvq->qsz_mask]); - - rxvq->last_avail_idx++; - rxvq->last_used_idx++; - hdr->num_buffers++; - desc_len = 0; - - if (PREDICT_FALSE - (rxvq->last_avail_idx == rxvq->avail->idx)) - { - //Dequeue queued descriptors for this packet - rxvq->last_used_idx -= hdr->num_buffers - 1; - rxvq->last_avail_idx -= hdr->num_buffers - 1; - error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; - goto done; - } - - desc_table = rxvq->desc; - desc_head = desc_index = - rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask]; - if (PREDICT_FALSE - (rxvq->desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT)) - { - //It is seriously unlikely that a driver will put indirect descriptor - //after non-indirect descriptor. - if (PREDICT_FALSE - (rxvq->desc[desc_head].len < sizeof (vring_desc_t))) - { - error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; - goto done; - } - if (PREDICT_FALSE - (!(desc_table = - map_guest_mem (vui, - rxvq->desc[desc_index].addr, - &map_hint)))) - { - error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; - goto done; - } - desc_index = 0; - } - buffer_map_addr = desc_table[desc_index].addr; - buffer_len = desc_table[desc_index].len; - } - else - { - error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG; - goto done; - } - } - - { - vhost_copy_t *cpy = &vum->cpus[thread_index].copy[copy_len]; - copy_len++; - cpy->len = bytes_left; - cpy->len = (cpy->len > buffer_len) ? buffer_len : cpy->len; - cpy->dst = buffer_map_addr; - cpy->src = (uword) vlib_buffer_get_current (current_b0) + - current_b0->current_length - bytes_left; - - bytes_left -= cpy->len; - buffer_len -= cpy->len; - buffer_map_addr += cpy->len; - desc_len += cpy->len; - - CLIB_PREFETCH (&rxvq->desc, CLIB_CACHE_LINE_BYTES, LOAD); - } - - // Check if vlib buffer has more data. If not, get more or break. - if (PREDICT_TRUE (!bytes_left)) - { - if (PREDICT_FALSE - (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT)) - { - current_b0 = vlib_get_buffer (vm, current_b0->next_buffer); - bytes_left = current_b0->current_length; - } - else - { - //End of packet - break; - } - } - } - - //Move from available to used ring - rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id = desc_head; - rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len = desc_len; - vhost_user_log_dirty_ring (vui, rxvq, - ring[rxvq->last_used_idx & rxvq->qsz_mask]); - rxvq->last_avail_idx++; - rxvq->last_used_idx++; - - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - vum->cpus[thread_index].current_trace->hdr = - vum->cpus[thread_index].tx_headers[tx_headers_len - 1]; - } - - n_left--; //At the end for error counting when 'goto done' is invoked - - /* - * Do the copy periodically to prevent - * vum->cpus[thread_index].copy array overflow and corrupt memory - */ - if (PREDICT_FALSE (copy_len >= VHOST_USER_TX_COPY_THRESHOLD)) - { - if (PREDICT_FALSE - (vhost_user_tx_copy (vui, vum->cpus[thread_index].copy, - copy_len, &map_hint))) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); - } - copy_len = 0; - - /* give buffers back to driver */ - CLIB_MEMORY_BARRIER (); - rxvq->used->idx = rxvq->last_used_idx; - vhost_user_log_dirty_ring (vui, rxvq, idx); - } - buffers++; - } - -done: - //Do the memory copies - if (PREDICT_FALSE - (vhost_user_tx_copy (vui, vum->cpus[thread_index].copy, - copy_len, &map_hint))) - { - vlib_error_count (vm, node->node_index, - VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); - } - - CLIB_MEMORY_BARRIER (); - rxvq->used->idx = rxvq->last_used_idx; - vhost_user_log_dirty_ring (vui, rxvq, idx); - - /* - * When n_left is set, error is always set to something too. - * In case error is due to lack of remaining buffers, we go back up and - * retry. - * The idea is that it is better to waste some time on packets - * that have been processed already than dropping them and get - * more fresh packets with a good likelyhood that they will be dropped too. - * This technique also gives more time to VM driver to pick-up packets. - * In case the traffic flows from physical to virtual interfaces, this - * technique will end-up leveraging the physical NIC buffer in order to - * absorb the VM's CPU jitter. - */ - if (n_left && (error == VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF) && retry) - { - retry--; - goto retry; - } - - /* interrupt (call) handling */ - if ((rxvq->callfd_idx != ~0) && - !(rxvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) - { - rxvq->n_since_last_int += frame->n_vectors - n_left; - - if (rxvq->n_since_last_int > vum->coalesce_frames) - vhost_user_send_call (vm, rxvq); - } - - vhost_user_vring_unlock (vui, qid); - -done3: - if (PREDICT_FALSE (n_left && error != VHOST_USER_TX_FUNC_ERROR_NONE)) - { - vlib_error_count (vm, node->node_index, error, n_left); - vlib_increment_simple_counter - (vnet_main.interface_main.sw_if_counters - + VNET_INTERFACE_COUNTER_DROP, - thread_index, vui->sw_if_index, n_left); - } - - vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors); - return frame->n_vectors; -} - static uword vhost_user_send_interrupt_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) @@ -2473,110 +1053,13 @@ vhost_user_send_interrupt_process (vlib_main_t * vm, } /* *INDENT-OFF* */ -VLIB_REGISTER_NODE (vhost_user_send_interrupt_node,static) = { +VLIB_REGISTER_NODE (vhost_user_send_interrupt_node) = { .function = vhost_user_send_interrupt_process, .type = VLIB_NODE_TYPE_PROCESS, .name = "vhost-user-send-interrupt-process", }; /* *INDENT-ON* */ -static clib_error_t * -vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, - u32 qid, vnet_hw_interface_rx_mode mode) -{ - vlib_main_t *vm = vnm->vlib_main; - vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index); - vhost_user_main_t *vum = &vhost_user_main; - vhost_user_intf_t *vui = - pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance); - vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; - - if ((mode == VNET_HW_INTERFACE_RX_MODE_INTERRUPT) || - (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE)) - { - if (txvq->kickfd_idx == ~0) - { - // We cannot support interrupt mode if the driver opts out - return clib_error_return (0, "Driver does not support interrupt"); - } - if (txvq->mode == VNET_HW_INTERFACE_RX_MODE_POLLING) - { - vum->ifq_count++; - // Start the timer if this is the first encounter on interrupt - // interface/queue - if ((vum->ifq_count == 1) && - (vum->coalesce_time > 0.0) && (vum->coalesce_frames > 0)) - vlib_process_signal_event (vm, - vhost_user_send_interrupt_node.index, - VHOST_USER_EVENT_START_TIMER, 0); - } - } - else if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING) - { - if (((txvq->mode == VNET_HW_INTERFACE_RX_MODE_INTERRUPT) || - (txvq->mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE)) && - vum->ifq_count) - { - vum->ifq_count--; - // Stop the timer if there is no more interrupt interface/queue - if ((vum->ifq_count == 0) && - (vum->coalesce_time > 0.0) && (vum->coalesce_frames > 0)) - vlib_process_signal_event (vm, - vhost_user_send_interrupt_node.index, - VHOST_USER_EVENT_STOP_TIMER, 0); - } - } - - txvq->mode = mode; - if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING) - txvq->used->flags = VRING_USED_F_NO_NOTIFY; - else if ((mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE) || - (mode == VNET_HW_INTERFACE_RX_MODE_INTERRUPT)) - txvq->used->flags = 0; - else - { - clib_warning ("BUG: unhandled mode %d changed for if %d queue %d", mode, - hw_if_index, qid); - return clib_error_return (0, "unsupported"); - } - - return 0; -} - -static clib_error_t * -vhost_user_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, - u32 flags) -{ - vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index); - vhost_user_main_t *vum = &vhost_user_main; - vhost_user_intf_t *vui = - pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance); - u32 hw_flags = 0; - vui->admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; - hw_flags = vui->admin_up ? VNET_HW_INTERFACE_FLAG_LINK_UP : 0; - - vnet_hw_interface_set_flags (vnm, vui->hw_if_index, hw_flags); - - return /* no error */ 0; -} - -/* *INDENT-OFF* */ -VNET_DEVICE_CLASS (vhost_user_dev_class,static) = { - .name = "vhost-user", - .tx_function = vhost_user_tx, - .tx_function_n_errors = VHOST_USER_TX_FUNC_N_ERROR, - .tx_function_error_strings = vhost_user_tx_func_error_strings, - .format_device_name = format_vhost_user_interface_name, - .name_renumber = vhost_user_name_renumber, - .admin_up_down_function = vhost_user_interface_admin_up_down, - .rx_mode_change_function = vhost_user_interface_rx_mode_change, - .format_tx_trace = format_vhost_trace, -}; - -VLIB_DEVICE_TX_FUNCTION_MULTIARCH (vhost_user_dev_class, - vhost_user_tx) -/* *INDENT-ON* */ - static uword vhost_user_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) @@ -2727,7 +1210,7 @@ vhost_user_delete_if (vnet_main_t * vnm, vlib_main_t * vm, u32 sw_if_index) u16 *queue; if (!(hwif = vnet_get_sup_hw_interface (vnm, sw_if_index)) || - hwif->dev_class_index != vhost_user_dev_class.index) + hwif->dev_class_index != vhost_user_device_class.index) return VNET_API_ERROR_INVALID_SW_IF_INDEX; DBG_SOCK ("Deleting vhost-user interface %s (instance %d)", @@ -2859,7 +1342,7 @@ vhost_user_create_ethernet (vnet_main_t * vnm, vlib_main_t * vm, error = ethernet_register_interface (vnm, - vhost_user_dev_class.index, + vhost_user_device_class.index, vui - vum->vhost_user_interfaces /* device instance */ , hwaddr /* ethernet address */ , &vui->hw_if_index, 0 /* flag change */ ); @@ -3007,7 +1490,7 @@ vhost_user_modify_if (vnet_main_t * vnm, vlib_main_t * vm, uword *if_index; if (!(hwif = vnet_get_sup_hw_interface (vnm, sw_if_index)) || - hwif->dev_class_index != vhost_user_dev_class.index) + hwif->dev_class_index != vhost_user_device_class.index) return VNET_API_ERROR_INVALID_SW_IF_INDEX; if (sock_filename == NULL || !(strlen (sock_filename) > 0)) @@ -3132,7 +1615,7 @@ vhost_user_delete_command_fn (vlib_main_t * vm, vnet_hw_interface_t *hwif = vnet_get_sup_hw_interface (vnm, sw_if_index); if (hwif == NULL || - vhost_user_dev_class.index != hwif->dev_class_index) + vhost_user_device_class.index != hwif->dev_class_index) { error = clib_error_return (0, "Not a vhost interface"); goto done; @@ -3251,7 +1734,7 @@ show_vhost_user_command_fn (vlib_main_t * vm, (input, "%U", unformat_vnet_hw_interface, vnm, &hw_if_index)) { hi = vnet_get_hw_interface (vnm, hw_if_index); - if (vhost_user_dev_class.index != hi->dev_class_index) + if (vhost_user_device_class.index != hi->dev_class_index) { error = clib_error_return (0, "unknown input `%U'", format_unformat_error, input); @@ -3732,6 +2215,7 @@ vhost_user_config (vlib_main_t * vm, unformat_input_t * input) return 0; } + /* vhost-user { ... } configuration. */ VLIB_CONFIG_FUNCTION (vhost_user_config, "vhost-user"); diff --git a/src/vnet/devices/virtio/vhost-user.h b/src/vnet/devices/virtio/vhost_user.h index 105b92b72ef..ff0669598c9 100644 --- a/src/vnet/devices/virtio/vhost-user.h +++ b/src/vnet/devices/virtio/vhost_user.h @@ -45,6 +45,40 @@ #define VRING_USED_F_NO_NOTIFY 1 #define VRING_AVAIL_F_NO_INTERRUPT 1 +#define DBG_SOCK(args...) \ + { \ + vhost_user_main_t *_vum = &vhost_user_main; \ + if (_vum->debug) \ + clib_warning(args); \ + }; + +#define VHOST_DEBUG_VQ 0 + +#if VHOST_DEBUG_VQ == 1 +#define DBG_VQ(args...) clib_warning(args); +#else +#define DBG_VQ(args...) +#endif + +#define UNIX_GET_FD(unixfd_idx) ({ \ + typeof(unixfd_idx) __unixfd_idx = (unixfd_idx); \ + (__unixfd_idx != ~0) ? \ + pool_elt_at_index (file_main.file_pool, \ + __unixfd_idx)->file_descriptor : -1; }) + +#define foreach_virtio_trace_flags \ + _ (SIMPLE_CHAINED, 0, "Simple descriptor chaining") \ + _ (SINGLE_DESC, 1, "Single descriptor packet") \ + _ (INDIRECT, 2, "Indirect descriptor") \ + _ (MAP_ERROR, 4, "Memory mapping error") + +typedef enum +{ +#define _(n,i,s) VIRTIO_TRACE_F_##n, + foreach_virtio_trace_flags +#undef _ +} virtio_trace_flag_t; + #define foreach_virtio_net_feature \ _ (VIRTIO_NET_F_MRG_RXBUF, 15) \ _ (VIRTIO_NET_F_CTRL_VQ, 17) \ @@ -56,7 +90,6 @@ _ (VHOST_USER_F_PROTOCOL_FEATURES, 30) \ _ (VIRTIO_F_VERSION_1, 32) - typedef enum { #define _(f,n) FEAT_##f = (n), @@ -331,6 +364,11 @@ typedef struct int vhost_user_dump_ifs (vnet_main_t * vnm, vlib_main_t * vm, vhost_user_intf_details_t ** out_vuids); +extern vlib_node_registration_t vhost_user_send_interrupt_node; +extern vnet_device_class_t vhost_user_device_class; +extern vlib_node_registration_t vhost_user_input_node; +extern vhost_user_main_t vhost_user_main; + #endif /* diff --git a/src/vnet/devices/virtio/vhost_user_api.c b/src/vnet/devices/virtio/vhost_user_api.c index 442d9146945..59dba252f22 100644 --- a/src/vnet/devices/virtio/vhost_user_api.c +++ b/src/vnet/devices/virtio/vhost_user_api.c @@ -22,7 +22,7 @@ #include <vnet/interface.h> #include <vnet/api_errno.h> -#include <vnet/devices/virtio/vhost-user.h> +#include <vnet/devices/virtio/vhost_user.h> #include <vnet/vnet_msg_enum.h> diff --git a/src/vnet/devices/virtio/vhost_user_inline.h b/src/vnet/devices/virtio/vhost_user_inline.h new file mode 100644 index 00000000000..9f6135165ae --- /dev/null +++ b/src/vnet/devices/virtio/vhost_user_inline.h @@ -0,0 +1,262 @@ +/* + * Copyright (c) 2018 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +#ifndef __VIRTIO_VHOST_USER_INLINE_H__ +#define __VIRTIO_VHOST_USER_INLINE_H__ +/* vhost-user inline functions */ + +static_always_inline void * +map_guest_mem (vhost_user_intf_t * vui, uword addr, u32 * hint) +{ + int i = *hint; + if (PREDICT_TRUE ((vui->regions[i].guest_phys_addr <= addr) && + ((vui->regions[i].guest_phys_addr + + vui->regions[i].memory_size) > addr))) + { + return (void *) (vui->region_mmap_addr[i] + addr - + vui->regions[i].guest_phys_addr); + } +#if __SSE4_2__ + __m128i rl, rh, al, ah, r; + al = _mm_set1_epi64x (addr + 1); + ah = _mm_set1_epi64x (addr); + + rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[0]); + rl = _mm_cmpgt_epi64 (al, rl); + rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[0]); + rh = _mm_cmpgt_epi64 (rh, ah); + r = _mm_and_si128 (rl, rh); + + rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[2]); + rl = _mm_cmpgt_epi64 (al, rl); + rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[2]); + rh = _mm_cmpgt_epi64 (rh, ah); + r = _mm_blend_epi16 (r, _mm_and_si128 (rl, rh), 0x22); + + rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[4]); + rl = _mm_cmpgt_epi64 (al, rl); + rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[4]); + rh = _mm_cmpgt_epi64 (rh, ah); + r = _mm_blend_epi16 (r, _mm_and_si128 (rl, rh), 0x44); + + rl = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_lo[6]); + rl = _mm_cmpgt_epi64 (al, rl); + rh = _mm_loadu_si128 ((__m128i *) & vui->region_guest_addr_hi[6]); + rh = _mm_cmpgt_epi64 (rh, ah); + r = _mm_blend_epi16 (r, _mm_and_si128 (rl, rh), 0x88); + + r = _mm_shuffle_epi8 (r, _mm_set_epi64x (0, 0x0e060c040a020800)); + i = count_trailing_zeros (_mm_movemask_epi8 (r) | + (1 << VHOST_MEMORY_MAX_NREGIONS)); + + if (i < vui->nregions) + { + *hint = i; + return (void *) (vui->region_mmap_addr[i] + addr - + vui->regions[i].guest_phys_addr); + } +#elif __aarch64__ && __ARM_NEON + uint64x2_t al, ah, rl, rh, r; + uint32_t u32 = 0; + + al = vdupq_n_u64 (addr + 1); + ah = vdupq_n_u64 (addr); + + /*First Iteration */ + rl = vld1q_u64 (&vui->region_guest_addr_lo[0]); + rl = vcgtq_u64 (al, rl); + rh = vld1q_u64 (&vui->region_guest_addr_hi[0]); + rh = vcgtq_u64 (rh, ah); + r = vandq_u64 (rl, rh); + u32 |= (vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 0) & 0x1); + u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 8) & 0x1) << 1); + + if (u32) + { + i = count_trailing_zeros (u32); + goto vhost_map_guest_mem_done; + } + + /*Second Iteration */ + rl = vld1q_u64 (&vui->region_guest_addr_lo[2]); + rl = vcgtq_u64 (al, rl); + rh = vld1q_u64 (&vui->region_guest_addr_hi[2]); + rh = vcgtq_u64 (rh, ah); + r = vandq_u64 (rl, rh); + u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 0) & 0x1) << 2); + u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 8) & 0x1) << 3); + + if (u32) + { + i = count_trailing_zeros (u32); + goto vhost_map_guest_mem_done; + } + + /*Third Iteration */ + rl = vld1q_u64 (&vui->region_guest_addr_lo[4]); + rl = vcgtq_u64 (al, rl); + rh = vld1q_u64 (&vui->region_guest_addr_hi[4]); + rh = vcgtq_u64 (rh, ah); + r = vandq_u64 (rl, rh); + u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 0) & 0x1) << 6); + u32 |= ((vgetq_lane_u8 (vreinterpretq_u8_u64 (r), 8) & 0x1) << 7); + + i = count_trailing_zeros (u32 | (1 << VHOST_MEMORY_MAX_NREGIONS)); + +vhost_map_guest_mem_done: + if (i < vui->nregions) + { + *hint = i; + return (void *) (vui->region_mmap_addr[i] + addr - + vui->regions[i].guest_phys_addr); + } +#else + for (i = 0; i < vui->nregions; i++) + { + if ((vui->regions[i].guest_phys_addr <= addr) && + ((vui->regions[i].guest_phys_addr + vui->regions[i].memory_size) > + addr)) + { + *hint = i; + return (void *) (vui->region_mmap_addr[i] + addr - + vui->regions[i].guest_phys_addr); + } + } +#endif + DBG_VQ ("failed to map guest mem addr %llx", addr); + *hint = 0; + return 0; +} + +static_always_inline void * +map_user_mem (vhost_user_intf_t * vui, uword addr) +{ + int i; + for (i = 0; i < vui->nregions; i++) + { + if ((vui->regions[i].userspace_addr <= addr) && + ((vui->regions[i].userspace_addr + vui->regions[i].memory_size) > + addr)) + { + return (void *) (vui->region_mmap_addr[i] + addr - + vui->regions[i].userspace_addr); + } + } + return 0; +} + +#define VHOST_LOG_PAGE 0x1000 + +static_always_inline void +vhost_user_log_dirty_pages_2 (vhost_user_intf_t * vui, + u64 addr, u64 len, u8 is_host_address) +{ + if (PREDICT_TRUE (vui->log_base_addr == 0 + || !(vui->features & (1 << FEAT_VHOST_F_LOG_ALL)))) + { + return; + } + if (is_host_address) + { + addr = pointer_to_uword (map_user_mem (vui, (uword) addr)); + } + if (PREDICT_FALSE ((addr + len - 1) / VHOST_LOG_PAGE / 8 >= vui->log_size)) + { + DBG_SOCK ("vhost_user_log_dirty_pages(): out of range\n"); + return; + } + + CLIB_MEMORY_BARRIER (); + u64 page = addr / VHOST_LOG_PAGE; + while (page * VHOST_LOG_PAGE < addr + len) + { + ((u8 *) vui->log_base_addr)[page / 8] |= 1 << page % 8; + page++; + } +} + + +#define vhost_user_log_dirty_ring(vui, vq, member) \ + if (PREDICT_FALSE(vq->log_used)) { \ + vhost_user_log_dirty_pages_2(vui, vq->log_guest_addr + STRUCT_OFFSET_OF(vring_used_t, member), \ + sizeof(vq->used->member), 0); \ + } + +static_always_inline u8 * +format_vhost_trace (u8 * s, va_list * va) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); + CLIB_UNUSED (vnet_main_t * vnm) = vnet_get_main (); + vhost_user_main_t *vum = &vhost_user_main; + vhost_trace_t *t = va_arg (*va, vhost_trace_t *); + vhost_user_intf_t *vui = pool_elt_at_index (vum->vhost_user_interfaces, + t->device_index); + + vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, vui->sw_if_index); + + u32 indent = format_get_indent (s); + + s = format (s, "%U %U queue %d\n", format_white_space, indent, + format_vnet_sw_interface_name, vnm, sw, t->qid); + + s = format (s, "%U virtio flags:\n", format_white_space, indent); +#define _(n,i,st) \ + if (t->virtio_ring_flags & (1 << VIRTIO_TRACE_F_##n)) \ + s = format (s, "%U %s %s\n", format_white_space, indent, #n, st); + foreach_virtio_trace_flags +#undef _ + s = format (s, "%U virtio_net_hdr first_desc_len %u\n", + format_white_space, indent, t->first_desc_len); + + s = format (s, "%U flags 0x%02x gso_type %u\n", + format_white_space, indent, + t->hdr.hdr.flags, t->hdr.hdr.gso_type); + + if (vui->virtio_net_hdr_sz == 12) + s = format (s, "%U num_buff %u", + format_white_space, indent, t->hdr.num_buffers); + + return s; +} + +static_always_inline void +vhost_user_send_call (vlib_main_t * vm, vhost_user_vring_t * vq) +{ + vhost_user_main_t *vum = &vhost_user_main; + u64 x = 1; + int fd = UNIX_GET_FD (vq->callfd_idx); + int rv; + + rv = write (fd, &x, sizeof (x)); + if (rv <= 0) + { + clib_unix_warning + ("Error: Could not write to unix socket for callfd %d", fd); + return; + } + + vq->n_since_last_int = 0; + vq->int_deadline = vlib_time_now (vm) + vum->coalesce_time; +} + +#endif + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vnet/devices/virtio/vhost_user_input.c b/src/vnet/devices/virtio/vhost_user_input.c new file mode 100644 index 00000000000..3db44731b5e --- /dev/null +++ b/src/vnet/devices/virtio/vhost_user_input.c @@ -0,0 +1,678 @@ +/* + *------------------------------------------------------------------ + * vhost-user-input + * + * Copyright (c) 2014-2018 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *------------------------------------------------------------------ + */ + +#include <fcntl.h> /* for open */ +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/uio.h> /* for iovec */ +#include <netinet/in.h> +#include <sys/vfs.h> + +#include <linux/if_arp.h> +#include <linux/if_tun.h> + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> + +#include <vnet/ip/ip.h> + +#include <vnet/ethernet/ethernet.h> +#include <vnet/devices/devices.h> +#include <vnet/feature/feature.h> + +#include <vnet/devices/virtio/vhost_user.h> +#include <vnet/devices/virtio/vhost_user_inline.h> + +/* + * When an RX queue is down but active, received packets + * must be discarded. This value controls up to how many + * packets will be discarded during each round. + */ +#define VHOST_USER_DOWN_DISCARD_COUNT 256 + +/* + * When the number of available buffers gets under this threshold, + * RX node will start discarding packets. + */ +#define VHOST_USER_RX_BUFFER_STARVATION 32 + +/* + * On the receive side, the host should free descriptors as soon + * as possible in order to avoid TX drop in the VM. + * This value controls the number of copy operations that are stacked + * before copy is done for all and descriptors are given back to + * the guest. + * The value 64 was obtained by testing (48 and 128 were not as good). + */ +#define VHOST_USER_RX_COPY_THRESHOLD 64 + +vlib_node_registration_t vhost_user_input_node; + +#define foreach_vhost_user_input_func_error \ + _(NO_ERROR, "no error") \ + _(NO_BUFFER, "no available buffer") \ + _(MMAP_FAIL, "mmap failure") \ + _(INDIRECT_OVERFLOW, "indirect descriptor overflows table") \ + _(UNDERSIZED_FRAME, "undersized ethernet frame received (< 14 bytes)") \ + _(FULL_RX_QUEUE, "full rx queue (possible driver tx drop)") + +typedef enum +{ +#define _(f,s) VHOST_USER_INPUT_FUNC_ERROR_##f, + foreach_vhost_user_input_func_error +#undef _ + VHOST_USER_INPUT_FUNC_N_ERROR, +} vhost_user_input_func_error_t; + +static __clib_unused char *vhost_user_input_func_error_strings[] = { +#define _(n,s) s, + foreach_vhost_user_input_func_error +#undef _ +}; + +static_always_inline void +vhost_user_rx_trace (vhost_trace_t * t, + vhost_user_intf_t * vui, u16 qid, + vlib_buffer_t * b, vhost_user_vring_t * txvq) +{ + vhost_user_main_t *vum = &vhost_user_main; + u32 last_avail_idx = txvq->last_avail_idx; + u32 desc_current = txvq->avail->ring[last_avail_idx & txvq->qsz_mask]; + vring_desc_t *hdr_desc = 0; + virtio_net_hdr_mrg_rxbuf_t *hdr; + u32 hint = 0; + + memset (t, 0, sizeof (*t)); + t->device_index = vui - vum->vhost_user_interfaces; + t->qid = qid; + + hdr_desc = &txvq->desc[desc_current]; + if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT) + { + t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; + /* Header is the first here */ + hdr_desc = map_guest_mem (vui, txvq->desc[desc_current].addr, &hint); + } + if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) + { + t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; + } + if (!(txvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) && + !(txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)) + { + t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; + } + + t->first_desc_len = hdr_desc ? hdr_desc->len : 0; + + if (!hdr_desc || !(hdr = map_guest_mem (vui, hdr_desc->addr, &hint))) + { + t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_MAP_ERROR; + } + else + { + u32 len = vui->virtio_net_hdr_sz; + memcpy (&t->hdr, hdr, len > hdr_desc->len ? hdr_desc->len : len); + } +} + +static_always_inline u32 +vhost_user_input_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy, + u16 copy_len, u32 * map_hint) +{ + void *src0, *src1, *src2, *src3; + if (PREDICT_TRUE (copy_len >= 4)) + { + if (PREDICT_FALSE (!(src2 = map_guest_mem (vui, cpy[0].src, map_hint)))) + return 1; + if (PREDICT_FALSE (!(src3 = map_guest_mem (vui, cpy[1].src, map_hint)))) + return 1; + + while (PREDICT_TRUE (copy_len >= 4)) + { + src0 = src2; + src1 = src3; + + if (PREDICT_FALSE + (!(src2 = map_guest_mem (vui, cpy[2].src, map_hint)))) + return 1; + if (PREDICT_FALSE + (!(src3 = map_guest_mem (vui, cpy[3].src, map_hint)))) + return 1; + + CLIB_PREFETCH (src2, 64, LOAD); + CLIB_PREFETCH (src3, 64, LOAD); + + clib_memcpy ((void *) cpy[0].dst, src0, cpy[0].len); + clib_memcpy ((void *) cpy[1].dst, src1, cpy[1].len); + copy_len -= 2; + cpy += 2; + } + } + while (copy_len) + { + if (PREDICT_FALSE (!(src0 = map_guest_mem (vui, cpy->src, map_hint)))) + return 1; + clib_memcpy ((void *) cpy->dst, src0, cpy->len); + copy_len -= 1; + cpy += 1; + } + return 0; +} + +/** + * Try to discard packets from the tx ring (VPP RX path). + * Returns the number of discarded packets. + */ +static_always_inline u32 +vhost_user_rx_discard_packet (vlib_main_t * vm, + vhost_user_intf_t * vui, + vhost_user_vring_t * txvq, u32 discard_max) +{ + /* + * On the RX side, each packet corresponds to one descriptor + * (it is the same whether it is a shallow descriptor, chained, or indirect). + * Therefore, discarding a packet is like discarding a descriptor. + */ + u32 discarded_packets = 0; + u32 avail_idx = txvq->avail->idx; + while (discarded_packets != discard_max) + { + if (avail_idx == txvq->last_avail_idx) + goto out; + + u16 desc_chain_head = + txvq->avail->ring[txvq->last_avail_idx & txvq->qsz_mask]; + txvq->last_avail_idx++; + txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].id = + desc_chain_head; + txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].len = 0; + vhost_user_log_dirty_ring (vui, txvq, + ring[txvq->last_used_idx & txvq->qsz_mask]); + txvq->last_used_idx++; + discarded_packets++; + } + +out: + CLIB_MEMORY_BARRIER (); + txvq->used->idx = txvq->last_used_idx; + vhost_user_log_dirty_ring (vui, txvq, idx); + return discarded_packets; +} + +/* + * In case of overflow, we need to rewind the array of allocated buffers. + */ +static __clib_unused void +vhost_user_input_rewind_buffers (vlib_main_t * vm, + vhost_cpu_t * cpu, vlib_buffer_t * b_head) +{ + u32 bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; + vlib_buffer_t *b_current = vlib_get_buffer (vm, bi_current); + b_current->current_length = 0; + b_current->flags = 0; + while (b_current != b_head) + { + cpu->rx_buffers_len++; + bi_current = cpu->rx_buffers[cpu->rx_buffers_len]; + b_current = vlib_get_buffer (vm, bi_current); + b_current->current_length = 0; + b_current->flags = 0; + } + cpu->rx_buffers_len++; +} + +static __clib_unused u32 +vhost_user_if_input (vlib_main_t * vm, + vhost_user_main_t * vum, + vhost_user_intf_t * vui, + u16 qid, vlib_node_runtime_t * node, + vnet_hw_interface_rx_mode mode) +{ + vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; + u16 n_rx_packets = 0; + u32 n_rx_bytes = 0; + u16 n_left; + u32 n_left_to_next, *to_next; + u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + u32 n_trace = vlib_get_trace_count (vm, node); + u32 map_hint = 0; + u16 thread_index = vlib_get_thread_index (); + u16 copy_len = 0; + + { + /* do we have pending interrupts ? */ + vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)]; + f64 now = vlib_time_now (vm); + + if ((txvq->n_since_last_int) && (txvq->int_deadline < now)) + vhost_user_send_call (vm, txvq); + + if ((rxvq->n_since_last_int) && (rxvq->int_deadline < now)) + vhost_user_send_call (vm, rxvq); + } + + /* + * For adaptive mode, it is optimized to reduce interrupts. + * If the scheduler switches the input node to polling due + * to burst of traffic, we tell the driver no interrupt. + * When the traffic subsides, the scheduler switches the node back to + * interrupt mode. We must tell the driver we want interrupt. + */ + if (PREDICT_FALSE (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE)) + { + if ((node->flags & + VLIB_NODE_FLAG_SWITCH_FROM_POLLING_TO_INTERRUPT_MODE) || + !(node->flags & + VLIB_NODE_FLAG_SWITCH_FROM_INTERRUPT_TO_POLLING_MODE)) + /* Tell driver we want notification */ + txvq->used->flags = 0; + else + /* Tell driver we don't want notification */ + txvq->used->flags = VRING_USED_F_NO_NOTIFY; + } + + if (PREDICT_FALSE (txvq->avail->flags & 0xFFFE)) + return 0; + + n_left = (u16) (txvq->avail->idx - txvq->last_avail_idx); + + /* nothing to do */ + if (PREDICT_FALSE (n_left == 0)) + return 0; + + if (PREDICT_FALSE (!vui->admin_up || !(txvq->enabled))) + { + /* + * Discard input packet if interface is admin down or vring is not + * enabled. + * "For example, for a networking device, in the disabled state + * client must not supply any new RX packets, but must process + * and discard any TX packets." + */ + vhost_user_rx_discard_packet (vm, vui, txvq, + VHOST_USER_DOWN_DISCARD_COUNT); + return 0; + } + + if (PREDICT_FALSE (n_left == (txvq->qsz_mask + 1))) + { + /* + * Informational error logging when VPP is not + * receiving packets fast enough. + */ + vlib_error_count (vm, node->node_index, + VHOST_USER_INPUT_FUNC_ERROR_FULL_RX_QUEUE, 1); + } + + if (n_left > VLIB_FRAME_SIZE) + n_left = VLIB_FRAME_SIZE; + + /* + * For small packets (<2kB), we will not need more than one vlib buffer + * per packet. In case packets are bigger, we will just yeld at some point + * in the loop and come back later. This is not an issue as for big packet, + * processing cost really comes from the memory copy. + * The assumption is that big packets will fit in 40 buffers. + */ + if (PREDICT_FALSE (vum->cpus[thread_index].rx_buffers_len < n_left + 1 || + vum->cpus[thread_index].rx_buffers_len < 40)) + { + u32 curr_len = vum->cpus[thread_index].rx_buffers_len; + vum->cpus[thread_index].rx_buffers_len += + vlib_buffer_alloc_from_free_list (vm, + vum->cpus[thread_index].rx_buffers + + curr_len, + VHOST_USER_RX_BUFFERS_N - curr_len, + VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX); + + if (PREDICT_FALSE + (vum->cpus[thread_index].rx_buffers_len < + VHOST_USER_RX_BUFFER_STARVATION)) + { + /* In case of buffer starvation, discard some packets from the queue + * and log the event. + * We keep doing best effort for the remaining packets. */ + u32 flush = (n_left + 1 > vum->cpus[thread_index].rx_buffers_len) ? + n_left + 1 - vum->cpus[thread_index].rx_buffers_len : 1; + flush = vhost_user_rx_discard_packet (vm, vui, txvq, flush); + + n_left -= flush; + vlib_increment_simple_counter (vnet_main. + interface_main.sw_if_counters + + VNET_INTERFACE_COUNTER_DROP, + vlib_get_thread_index (), + vui->sw_if_index, flush); + + vlib_error_count (vm, vhost_user_input_node.index, + VHOST_USER_INPUT_FUNC_ERROR_NO_BUFFER, flush); + } + } + + while (n_left > 0) + { + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left > 0 && n_left_to_next > 0) + { + vlib_buffer_t *b_head, *b_current; + u32 bi_current; + u16 desc_current; + u32 desc_data_offset; + vring_desc_t *desc_table = txvq->desc; + + if (PREDICT_FALSE (vum->cpus[thread_index].rx_buffers_len <= 1)) + { + /* Not enough rx_buffers + * Note: We yeld on 1 so we don't need to do an additional + * check for the next buffer prefetch. + */ + n_left = 0; + break; + } + + desc_current = + txvq->avail->ring[txvq->last_avail_idx & txvq->qsz_mask]; + vum->cpus[thread_index].rx_buffers_len--; + bi_current = (vum->cpus[thread_index].rx_buffers) + [vum->cpus[thread_index].rx_buffers_len]; + b_head = b_current = vlib_get_buffer (vm, bi_current); + to_next[0] = bi_current; //We do that now so we can forget about bi_current + to_next++; + n_left_to_next--; + + vlib_prefetch_buffer_with_index (vm, + (vum-> + cpus[thread_index].rx_buffers) + [vum->cpus[thread_index]. + rx_buffers_len - 1], LOAD); + + /* Just preset the used descriptor id and length for later */ + txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].id = + desc_current; + txvq->used->ring[txvq->last_used_idx & txvq->qsz_mask].len = 0; + vhost_user_log_dirty_ring (vui, txvq, + ring[txvq->last_used_idx & + txvq->qsz_mask]); + + /* The buffer should already be initialized */ + b_head->total_length_not_including_first_buffer = 0; + b_head->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; + + if (PREDICT_FALSE (n_trace)) + { + //TODO: next_index is not exactly known at that point + vlib_trace_buffer (vm, node, next_index, b_head, + /* follow_chain */ 0); + vhost_trace_t *t0 = + vlib_add_trace (vm, node, b_head, sizeof (t0[0])); + vhost_user_rx_trace (t0, vui, qid, b_head, txvq); + n_trace--; + vlib_set_trace_count (vm, node, n_trace); + } + + /* This depends on the setup but is very consistent + * So I think the CPU branch predictor will make a pretty good job + * at optimizing the decision. */ + if (txvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT) + { + desc_table = map_guest_mem (vui, txvq->desc[desc_current].addr, + &map_hint); + desc_current = 0; + if (PREDICT_FALSE (desc_table == 0)) + { + vlib_error_count (vm, node->node_index, + VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); + goto out; + } + } + + if (PREDICT_TRUE (vui->is_any_layout) || + (!(desc_table[desc_current].flags & VIRTQ_DESC_F_NEXT))) + { + /* ANYLAYOUT or single buffer */ + desc_data_offset = vui->virtio_net_hdr_sz; + } + else + { + /* CSR case without ANYLAYOUT, skip 1st buffer */ + desc_data_offset = desc_table[desc_current].len; + } + + while (1) + { + /* Get more input if necessary. Or end of packet. */ + if (desc_data_offset == desc_table[desc_current].len) + { + if (PREDICT_FALSE (desc_table[desc_current].flags & + VIRTQ_DESC_F_NEXT)) + { + desc_current = desc_table[desc_current].next; + desc_data_offset = 0; + } + else + { + goto out; + } + } + + /* Get more output if necessary. Or end of packet. */ + if (PREDICT_FALSE + (b_current->current_length == VLIB_BUFFER_DATA_SIZE)) + { + if (PREDICT_FALSE + (vum->cpus[thread_index].rx_buffers_len == 0)) + { + /* Cancel speculation */ + to_next--; + n_left_to_next++; + + /* + * Checking if there are some left buffers. + * If not, just rewind the used buffers and stop. + * Note: Scheduled copies are not cancelled. This is + * not an issue as they would still be valid. Useless, + * but valid. + */ + vhost_user_input_rewind_buffers (vm, + &vum->cpus + [thread_index], + b_head); + n_left = 0; + goto stop; + } + + /* Get next output */ + vum->cpus[thread_index].rx_buffers_len--; + u32 bi_next = + (vum->cpus[thread_index].rx_buffers)[vum->cpus + [thread_index].rx_buffers_len]; + b_current->next_buffer = bi_next; + b_current->flags |= VLIB_BUFFER_NEXT_PRESENT; + bi_current = bi_next; + b_current = vlib_get_buffer (vm, bi_current); + } + + /* Prepare a copy order executed later for the data */ + vhost_copy_t *cpy = &vum->cpus[thread_index].copy[copy_len]; + copy_len++; + u32 desc_data_l = + desc_table[desc_current].len - desc_data_offset; + cpy->len = VLIB_BUFFER_DATA_SIZE - b_current->current_length; + cpy->len = (cpy->len > desc_data_l) ? desc_data_l : cpy->len; + cpy->dst = (uword) (vlib_buffer_get_current (b_current) + + b_current->current_length); + cpy->src = desc_table[desc_current].addr + desc_data_offset; + + desc_data_offset += cpy->len; + + b_current->current_length += cpy->len; + b_head->total_length_not_including_first_buffer += cpy->len; + } + + out: + CLIB_PREFETCH (&n_left, sizeof (n_left), LOAD); + + n_rx_bytes += b_head->total_length_not_including_first_buffer; + n_rx_packets++; + + b_head->total_length_not_including_first_buffer -= + b_head->current_length; + + /* consume the descriptor and return it as used */ + txvq->last_avail_idx++; + txvq->last_used_idx++; + + VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b_head); + + vnet_buffer (b_head)->sw_if_index[VLIB_RX] = vui->sw_if_index; + vnet_buffer (b_head)->sw_if_index[VLIB_TX] = (u32) ~ 0; + b_head->error = 0; + + { + u32 next0 = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + + /* redirect if feature path enabled */ + vnet_feature_start_device_input_x1 (vui->sw_if_index, &next0, + b_head); + + u32 bi = to_next[-1]; //Cannot use to_next[-1] in the macro + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi, next0); + } + + n_left--; + + /* + * Although separating memory copies from virtio ring parsing + * is beneficial, we can offer to perform the copies from time + * to time in order to free some space in the ring. + */ + if (PREDICT_FALSE (copy_len >= VHOST_USER_RX_COPY_THRESHOLD)) + { + if (PREDICT_FALSE + (vhost_user_input_copy (vui, vum->cpus[thread_index].copy, + copy_len, &map_hint))) + { + vlib_error_count (vm, node->node_index, + VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); + } + copy_len = 0; + + /* give buffers back to driver */ + CLIB_MEMORY_BARRIER (); + txvq->used->idx = txvq->last_used_idx; + vhost_user_log_dirty_ring (vui, txvq, idx); + } + } + stop: + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + /* Do the memory copies */ + if (PREDICT_FALSE + (vhost_user_input_copy (vui, vum->cpus[thread_index].copy, + copy_len, &map_hint))) + { + vlib_error_count (vm, node->node_index, + VHOST_USER_INPUT_FUNC_ERROR_MMAP_FAIL, 1); + } + + /* give buffers back to driver */ + CLIB_MEMORY_BARRIER (); + txvq->used->idx = txvq->last_used_idx; + vhost_user_log_dirty_ring (vui, txvq, idx); + + /* interrupt (call) handling */ + if ((txvq->callfd_idx != ~0) && + !(txvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) + { + txvq->n_since_last_int += n_rx_packets; + + if (txvq->n_since_last_int > vum->coalesce_frames) + vhost_user_send_call (vm, txvq); + } + + /* increase rx counters */ + vlib_increment_combined_counter + (vnet_main.interface_main.combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + vlib_get_thread_index (), vui->sw_if_index, n_rx_packets, n_rx_bytes); + + vnet_device_increment_rx_packets (thread_index, n_rx_packets); + + return n_rx_packets; +} + +VLIB_NODE_FN (vhost_user_input_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + vhost_user_main_t *vum = &vhost_user_main; + uword n_rx_packets = 0; + vhost_user_intf_t *vui; + vnet_device_input_runtime_t *rt = + (vnet_device_input_runtime_t *) node->runtime_data; + vnet_device_and_queue_t *dq; + + vec_foreach (dq, rt->devices_and_queues) + { + if (clib_smp_swap (&dq->interrupt_pending, 0) || + (node->state == VLIB_NODE_STATE_POLLING)) + { + vui = + pool_elt_at_index (vum->vhost_user_interfaces, dq->dev_instance); + n_rx_packets = vhost_user_if_input (vm, vum, vui, dq->queue_id, node, + dq->mode); + } + } + + return n_rx_packets; +} + +#ifndef CLIB_MARCH_VARIANT +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (vhost_user_input_node) = { + .type = VLIB_NODE_TYPE_INPUT, + .name = "vhost-user-input", + .sibling_of = "device-input", + + /* Will be enabled if/when hardware is detected. */ + .state = VLIB_NODE_STATE_DISABLED, + + .format_buffer = format_ethernet_header_with_length, + .format_trace = format_vhost_trace, + + .n_errors = VHOST_USER_INPUT_FUNC_N_ERROR, + .error_strings = vhost_user_input_func_error_strings, +}; +/* *INDENT-ON* */ +#endif + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vnet/devices/virtio/vhost_user_output.c b/src/vnet/devices/virtio/vhost_user_output.c new file mode 100644 index 00000000000..f400f18307a --- /dev/null +++ b/src/vnet/devices/virtio/vhost_user_output.c @@ -0,0 +1,671 @@ +/* + *------------------------------------------------------------------ + * vhost-user-output + * + * Copyright (c) 2014-2018 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + *------------------------------------------------------------------ + */ + +#include <fcntl.h> /* for open */ +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/uio.h> /* for iovec */ +#include <netinet/in.h> +#include <sys/vfs.h> + +#include <linux/if_arp.h> +#include <linux/if_tun.h> + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> + +#include <vnet/ip/ip.h> + +#include <vnet/ethernet/ethernet.h> +#include <vnet/devices/devices.h> +#include <vnet/feature/feature.h> + +#include <vnet/devices/virtio/vhost_user.h> +#include <vnet/devices/virtio/vhost_user_inline.h> + +/* + * On the transmit side, we keep processing the buffers from vlib in the while + * loop and prepare the copy order to be executed later. However, the static + * array which we keep the copy order is limited to VHOST_USER_COPY_ARRAY_N + * entries. In order to not corrupt memory, we have to do the copy when the + * static array reaches the copy threshold. We subtract 40 in case the code + * goes into the inner loop for a maximum of 64k frames which may require + * more array entries. + */ +#define VHOST_USER_TX_COPY_THRESHOLD (VHOST_USER_COPY_ARRAY_N - 40) + +vnet_device_class_t vhost_user_device_class; + +#define foreach_vhost_user_tx_func_error \ + _(NONE, "no error") \ + _(NOT_READY, "vhost vring not ready") \ + _(DOWN, "vhost interface is down") \ + _(PKT_DROP_NOBUF, "tx packet drops (no available descriptors)") \ + _(PKT_DROP_NOMRG, "tx packet drops (cannot merge descriptors)") \ + _(MMAP_FAIL, "mmap failure") \ + _(INDIRECT_OVERFLOW, "indirect descriptor table overflow") + +typedef enum +{ +#define _(f,s) VHOST_USER_TX_FUNC_ERROR_##f, + foreach_vhost_user_tx_func_error +#undef _ + VHOST_USER_TX_FUNC_N_ERROR, +} vhost_user_tx_func_error_t; + +static __clib_unused char *vhost_user_tx_func_error_strings[] = { +#define _(n,s) s, + foreach_vhost_user_tx_func_error +#undef _ +}; + +static __clib_unused u8 * +format_vhost_user_interface_name (u8 * s, va_list * args) +{ + u32 i = va_arg (*args, u32); + u32 show_dev_instance = ~0; + vhost_user_main_t *vum = &vhost_user_main; + + if (i < vec_len (vum->show_dev_instance_by_real_dev_instance)) + show_dev_instance = vum->show_dev_instance_by_real_dev_instance[i]; + + if (show_dev_instance != ~0) + i = show_dev_instance; + + s = format (s, "VirtualEthernet0/0/%d", i); + return s; +} + +static __clib_unused int +vhost_user_name_renumber (vnet_hw_interface_t * hi, u32 new_dev_instance) +{ + // FIXME: check if the new dev instance is already used + vhost_user_main_t *vum = &vhost_user_main; + vec_validate_init_empty (vum->show_dev_instance_by_real_dev_instance, + hi->dev_instance, ~0); + + vum->show_dev_instance_by_real_dev_instance[hi->dev_instance] = + new_dev_instance; + + DBG_SOCK ("renumbered vhost-user interface dev_instance %d to %d", + hi->dev_instance, new_dev_instance); + + return 0; +} + +/** + * @brief Try once to lock the vring + * @return 0 on success, non-zero on failure. + */ +static_always_inline int +vhost_user_vring_try_lock (vhost_user_intf_t * vui, u32 qid) +{ + return __sync_lock_test_and_set (vui->vring_locks[qid], 1); +} + +/** + * @brief Spin until the vring is successfully locked + */ +static_always_inline void +vhost_user_vring_lock (vhost_user_intf_t * vui, u32 qid) +{ + while (vhost_user_vring_try_lock (vui, qid)) + ; +} + +/** + * @brief Unlock the vring lock + */ +static_always_inline void +vhost_user_vring_unlock (vhost_user_intf_t * vui, u32 qid) +{ + *vui->vring_locks[qid] = 0; +} + +static_always_inline void +vhost_user_tx_trace (vhost_trace_t * t, + vhost_user_intf_t * vui, u16 qid, + vlib_buffer_t * b, vhost_user_vring_t * rxvq) +{ + vhost_user_main_t *vum = &vhost_user_main; + u32 last_avail_idx = rxvq->last_avail_idx; + u32 desc_current = rxvq->avail->ring[last_avail_idx & rxvq->qsz_mask]; + vring_desc_t *hdr_desc = 0; + u32 hint = 0; + + memset (t, 0, sizeof (*t)); + t->device_index = vui - vum->vhost_user_interfaces; + t->qid = qid; + + hdr_desc = &rxvq->desc[desc_current]; + if (rxvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT) + { + t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_INDIRECT; + /* Header is the first here */ + hdr_desc = map_guest_mem (vui, rxvq->desc[desc_current].addr, &hint); + } + if (rxvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) + { + t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SIMPLE_CHAINED; + } + if (!(rxvq->desc[desc_current].flags & VIRTQ_DESC_F_NEXT) && + !(rxvq->desc[desc_current].flags & VIRTQ_DESC_F_INDIRECT)) + { + t->virtio_ring_flags |= 1 << VIRTIO_TRACE_F_SINGLE_DESC; + } + + t->first_desc_len = hdr_desc ? hdr_desc->len : 0; +} + +static_always_inline u32 +vhost_user_tx_copy (vhost_user_intf_t * vui, vhost_copy_t * cpy, + u16 copy_len, u32 * map_hint) +{ + void *dst0, *dst1, *dst2, *dst3; + if (PREDICT_TRUE (copy_len >= 4)) + { + if (PREDICT_FALSE (!(dst2 = map_guest_mem (vui, cpy[0].dst, map_hint)))) + return 1; + if (PREDICT_FALSE (!(dst3 = map_guest_mem (vui, cpy[1].dst, map_hint)))) + return 1; + while (PREDICT_TRUE (copy_len >= 4)) + { + dst0 = dst2; + dst1 = dst3; + + if (PREDICT_FALSE + (!(dst2 = map_guest_mem (vui, cpy[2].dst, map_hint)))) + return 1; + if (PREDICT_FALSE + (!(dst3 = map_guest_mem (vui, cpy[3].dst, map_hint)))) + return 1; + + CLIB_PREFETCH ((void *) cpy[2].src, 64, LOAD); + CLIB_PREFETCH ((void *) cpy[3].src, 64, LOAD); + + clib_memcpy (dst0, (void *) cpy[0].src, cpy[0].len); + clib_memcpy (dst1, (void *) cpy[1].src, cpy[1].len); + + vhost_user_log_dirty_pages_2 (vui, cpy[0].dst, cpy[0].len, 1); + vhost_user_log_dirty_pages_2 (vui, cpy[1].dst, cpy[1].len, 1); + copy_len -= 2; + cpy += 2; + } + } + while (copy_len) + { + if (PREDICT_FALSE (!(dst0 = map_guest_mem (vui, cpy->dst, map_hint)))) + return 1; + clib_memcpy (dst0, (void *) cpy->src, cpy->len); + vhost_user_log_dirty_pages_2 (vui, cpy->dst, cpy->len, 1); + copy_len -= 1; + cpy += 1; + } + return 0; +} + + +uword +CLIB_MULTIARCH_FN (vhost_user_tx) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 *buffers = vlib_frame_args (frame); + u32 n_left = frame->n_vectors; + vhost_user_main_t *vum = &vhost_user_main; + vnet_interface_output_runtime_t *rd = (void *) node->runtime_data; + vhost_user_intf_t *vui = + pool_elt_at_index (vum->vhost_user_interfaces, rd->dev_instance); + u32 qid = ~0; + vhost_user_vring_t *rxvq; + u8 error; + u32 thread_index = vlib_get_thread_index (); + u32 map_hint = 0; + u8 retry = 8; + u16 copy_len; + u16 tx_headers_len; + + if (PREDICT_FALSE (!vui->admin_up)) + { + error = VHOST_USER_TX_FUNC_ERROR_DOWN; + goto done3; + } + + if (PREDICT_FALSE (!vui->is_up)) + { + error = VHOST_USER_TX_FUNC_ERROR_NOT_READY; + goto done3; + } + + qid = + VHOST_VRING_IDX_RX (*vec_elt_at_index + (vui->per_cpu_tx_qid, thread_index)); + rxvq = &vui->vrings[qid]; + if (PREDICT_FALSE (vui->use_tx_spinlock)) + vhost_user_vring_lock (vui, qid); + +retry: + error = VHOST_USER_TX_FUNC_ERROR_NONE; + tx_headers_len = 0; + copy_len = 0; + while (n_left > 0) + { + vlib_buffer_t *b0, *current_b0; + u16 desc_head, desc_index, desc_len; + vring_desc_t *desc_table; + uword buffer_map_addr; + u32 buffer_len; + u16 bytes_left; + + if (PREDICT_TRUE (n_left > 1)) + vlib_prefetch_buffer_with_index (vm, buffers[1], LOAD); + + b0 = vlib_get_buffer (vm, buffers[0]); + + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + vum->cpus[thread_index].current_trace = + vlib_add_trace (vm, node, b0, + sizeof (*vum->cpus[thread_index].current_trace)); + vhost_user_tx_trace (vum->cpus[thread_index].current_trace, + vui, qid / 2, b0, rxvq); + } + + if (PREDICT_FALSE (rxvq->last_avail_idx == rxvq->avail->idx)) + { + error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; + goto done; + } + + desc_table = rxvq->desc; + desc_head = desc_index = + rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask]; + + /* Go deeper in case of indirect descriptor + * I don't know of any driver providing indirect for RX. */ + if (PREDICT_FALSE (rxvq->desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT)) + { + if (PREDICT_FALSE + (rxvq->desc[desc_head].len < sizeof (vring_desc_t))) + { + error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; + goto done; + } + if (PREDICT_FALSE + (!(desc_table = + map_guest_mem (vui, rxvq->desc[desc_index].addr, + &map_hint)))) + { + error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + goto done; + } + desc_index = 0; + } + + desc_len = vui->virtio_net_hdr_sz; + buffer_map_addr = desc_table[desc_index].addr; + buffer_len = desc_table[desc_index].len; + + { + // Get a header from the header array + virtio_net_hdr_mrg_rxbuf_t *hdr = + &vum->cpus[thread_index].tx_headers[tx_headers_len]; + tx_headers_len++; + hdr->hdr.flags = 0; + hdr->hdr.gso_type = 0; + hdr->num_buffers = 1; //This is local, no need to check + + // Prepare a copy order executed later for the header + vhost_copy_t *cpy = &vum->cpus[thread_index].copy[copy_len]; + copy_len++; + cpy->len = vui->virtio_net_hdr_sz; + cpy->dst = buffer_map_addr; + cpy->src = (uword) hdr; + } + + buffer_map_addr += vui->virtio_net_hdr_sz; + buffer_len -= vui->virtio_net_hdr_sz; + bytes_left = b0->current_length; + current_b0 = b0; + while (1) + { + if (buffer_len == 0) + { //Get new output + if (desc_table[desc_index].flags & VIRTQ_DESC_F_NEXT) + { + //Next one is chained + desc_index = desc_table[desc_index].next; + buffer_map_addr = desc_table[desc_index].addr; + buffer_len = desc_table[desc_index].len; + } + else if (vui->virtio_net_hdr_sz == 12) //MRG is available + { + virtio_net_hdr_mrg_rxbuf_t *hdr = + &vum->cpus[thread_index].tx_headers[tx_headers_len - 1]; + + //Move from available to used buffer + rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id = + desc_head; + rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len = + desc_len; + vhost_user_log_dirty_ring (vui, rxvq, + ring[rxvq->last_used_idx & + rxvq->qsz_mask]); + + rxvq->last_avail_idx++; + rxvq->last_used_idx++; + hdr->num_buffers++; + desc_len = 0; + + if (PREDICT_FALSE + (rxvq->last_avail_idx == rxvq->avail->idx)) + { + //Dequeue queued descriptors for this packet + rxvq->last_used_idx -= hdr->num_buffers - 1; + rxvq->last_avail_idx -= hdr->num_buffers - 1; + error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF; + goto done; + } + + desc_table = rxvq->desc; + desc_head = desc_index = + rxvq->avail->ring[rxvq->last_avail_idx & rxvq->qsz_mask]; + if (PREDICT_FALSE + (rxvq->desc[desc_head].flags & VIRTQ_DESC_F_INDIRECT)) + { + //It is seriously unlikely that a driver will put indirect descriptor + //after non-indirect descriptor. + if (PREDICT_FALSE + (rxvq->desc[desc_head].len < sizeof (vring_desc_t))) + { + error = VHOST_USER_TX_FUNC_ERROR_INDIRECT_OVERFLOW; + goto done; + } + if (PREDICT_FALSE + (!(desc_table = + map_guest_mem (vui, + rxvq->desc[desc_index].addr, + &map_hint)))) + { + error = VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL; + goto done; + } + desc_index = 0; + } + buffer_map_addr = desc_table[desc_index].addr; + buffer_len = desc_table[desc_index].len; + } + else + { + error = VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOMRG; + goto done; + } + } + + { + vhost_copy_t *cpy = &vum->cpus[thread_index].copy[copy_len]; + copy_len++; + cpy->len = bytes_left; + cpy->len = (cpy->len > buffer_len) ? buffer_len : cpy->len; + cpy->dst = buffer_map_addr; + cpy->src = (uword) vlib_buffer_get_current (current_b0) + + current_b0->current_length - bytes_left; + + bytes_left -= cpy->len; + buffer_len -= cpy->len; + buffer_map_addr += cpy->len; + desc_len += cpy->len; + + CLIB_PREFETCH (&rxvq->desc, CLIB_CACHE_LINE_BYTES, LOAD); + } + + // Check if vlib buffer has more data. If not, get more or break. + if (PREDICT_TRUE (!bytes_left)) + { + if (PREDICT_FALSE + (current_b0->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + current_b0 = vlib_get_buffer (vm, current_b0->next_buffer); + bytes_left = current_b0->current_length; + } + else + { + //End of packet + break; + } + } + } + + //Move from available to used ring + rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].id = desc_head; + rxvq->used->ring[rxvq->last_used_idx & rxvq->qsz_mask].len = desc_len; + vhost_user_log_dirty_ring (vui, rxvq, + ring[rxvq->last_used_idx & rxvq->qsz_mask]); + rxvq->last_avail_idx++; + rxvq->last_used_idx++; + + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + vum->cpus[thread_index].current_trace->hdr = + vum->cpus[thread_index].tx_headers[tx_headers_len - 1]; + } + + n_left--; //At the end for error counting when 'goto done' is invoked + + /* + * Do the copy periodically to prevent + * vum->cpus[thread_index].copy array overflow and corrupt memory + */ + if (PREDICT_FALSE (copy_len >= VHOST_USER_TX_COPY_THRESHOLD)) + { + if (PREDICT_FALSE + (vhost_user_tx_copy (vui, vum->cpus[thread_index].copy, + copy_len, &map_hint))) + { + vlib_error_count (vm, node->node_index, + VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); + } + copy_len = 0; + + /* give buffers back to driver */ + CLIB_MEMORY_BARRIER (); + rxvq->used->idx = rxvq->last_used_idx; + vhost_user_log_dirty_ring (vui, rxvq, idx); + } + buffers++; + } + +done: + //Do the memory copies + if (PREDICT_FALSE + (vhost_user_tx_copy (vui, vum->cpus[thread_index].copy, + copy_len, &map_hint))) + { + vlib_error_count (vm, node->node_index, + VHOST_USER_TX_FUNC_ERROR_MMAP_FAIL, 1); + } + + CLIB_MEMORY_BARRIER (); + rxvq->used->idx = rxvq->last_used_idx; + vhost_user_log_dirty_ring (vui, rxvq, idx); + + /* + * When n_left is set, error is always set to something too. + * In case error is due to lack of remaining buffers, we go back up and + * retry. + * The idea is that it is better to waste some time on packets + * that have been processed already than dropping them and get + * more fresh packets with a good likelyhood that they will be dropped too. + * This technique also gives more time to VM driver to pick-up packets. + * In case the traffic flows from physical to virtual interfaces, this + * technique will end-up leveraging the physical NIC buffer in order to + * absorb the VM's CPU jitter. + */ + if (n_left && (error == VHOST_USER_TX_FUNC_ERROR_PKT_DROP_NOBUF) && retry) + { + retry--; + goto retry; + } + + /* interrupt (call) handling */ + if ((rxvq->callfd_idx != ~0) && + !(rxvq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) + { + rxvq->n_since_last_int += frame->n_vectors - n_left; + + if (rxvq->n_since_last_int > vum->coalesce_frames) + vhost_user_send_call (vm, rxvq); + } + + vhost_user_vring_unlock (vui, qid); + +done3: + if (PREDICT_FALSE (n_left && error != VHOST_USER_TX_FUNC_ERROR_NONE)) + { + vlib_error_count (vm, node->node_index, error, n_left); + vlib_increment_simple_counter + (vnet_main.interface_main.sw_if_counters + + VNET_INTERFACE_COUNTER_DROP, + thread_index, vui->sw_if_index, n_left); + } + + vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors); + return frame->n_vectors; +} + +static __clib_unused clib_error_t * +vhost_user_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, + u32 qid, vnet_hw_interface_rx_mode mode) +{ + vlib_main_t *vm = vnm->vlib_main; + vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index); + vhost_user_main_t *vum = &vhost_user_main; + vhost_user_intf_t *vui = + pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance); + vhost_user_vring_t *txvq = &vui->vrings[VHOST_VRING_IDX_TX (qid)]; + + if ((mode == VNET_HW_INTERFACE_RX_MODE_INTERRUPT) || + (mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE)) + { + if (txvq->kickfd_idx == ~0) + { + // We cannot support interrupt mode if the driver opts out + return clib_error_return (0, "Driver does not support interrupt"); + } + if (txvq->mode == VNET_HW_INTERFACE_RX_MODE_POLLING) + { + vum->ifq_count++; + // Start the timer if this is the first encounter on interrupt + // interface/queue + if ((vum->ifq_count == 1) && + (vum->coalesce_time > 0.0) && (vum->coalesce_frames > 0)) + vlib_process_signal_event (vm, + vhost_user_send_interrupt_node.index, + VHOST_USER_EVENT_START_TIMER, 0); + } + } + else if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING) + { + if (((txvq->mode == VNET_HW_INTERFACE_RX_MODE_INTERRUPT) || + (txvq->mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE)) && + vum->ifq_count) + { + vum->ifq_count--; + // Stop the timer if there is no more interrupt interface/queue + if ((vum->ifq_count == 0) && + (vum->coalesce_time > 0.0) && (vum->coalesce_frames > 0)) + vlib_process_signal_event (vm, + vhost_user_send_interrupt_node.index, + VHOST_USER_EVENT_STOP_TIMER, 0); + } + } + + txvq->mode = mode; + if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING) + txvq->used->flags = VRING_USED_F_NO_NOTIFY; + else if ((mode == VNET_HW_INTERFACE_RX_MODE_ADAPTIVE) || + (mode == VNET_HW_INTERFACE_RX_MODE_INTERRUPT)) + txvq->used->flags = 0; + else + { + clib_warning ("BUG: unhandled mode %d changed for if %d queue %d", mode, + hw_if_index, qid); + return clib_error_return (0, "unsupported"); + } + + return 0; +} + +static __clib_unused clib_error_t * +vhost_user_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, + u32 flags) +{ + vnet_hw_interface_t *hif = vnet_get_hw_interface (vnm, hw_if_index); + vhost_user_main_t *vum = &vhost_user_main; + vhost_user_intf_t *vui = + pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance); + u32 hw_flags = 0; + vui->admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0; + hw_flags = vui->admin_up ? VNET_HW_INTERFACE_FLAG_LINK_UP : 0; + + vnet_hw_interface_set_flags (vnm, vui->hw_if_index, hw_flags); + + return /* no error */ 0; +} + +#ifndef CLIB_MARCH_VARIANT +/* *INDENT-OFF* */ +VNET_DEVICE_CLASS (vhost_user_device_class) = { + .name = "vhost-user", + .tx_function = vhost_user_tx, + .tx_function_n_errors = VHOST_USER_TX_FUNC_N_ERROR, + .tx_function_error_strings = vhost_user_tx_func_error_strings, + .format_device_name = format_vhost_user_interface_name, + .name_renumber = vhost_user_name_renumber, + .admin_up_down_function = vhost_user_interface_admin_up_down, + .rx_mode_change_function = vhost_user_interface_rx_mode_change, + .format_tx_trace = format_vhost_trace, +}; + +#if __x86_64__ +vlib_node_function_t __clib_weak vhost_user_tx_avx512; +vlib_node_function_t __clib_weak vhost_user_tx_avx2; +static void __clib_constructor +vhost_user_tx_multiarch_select (void) +{ + if (vhost_user_tx_avx512 && clib_cpu_supports_avx512f ()) + vhost_user_device_class.tx_function = vhost_user_tx_avx512; + else if (vhost_user_tx_avx2 && clib_cpu_supports_avx2 ()) + vhost_user_device_class.tx_function = vhost_user_tx_avx2; +} +#endif +#endif + +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |