Gitiles
Code Review Sign In
gerrit.nordix.org / fdio / vpp / bc799c92d761a2d45105aa6a1685b3663687d2a4 / . / src / vnet / devices / virtio / vhost-user.c
blob: 00807dc03982dd22938087d7ff7030269c650303 [file] [log] [blame]
/*
*------------------------------------------------------------------
* vhost.c - vhost-user
*
* Copyright (c) 2014 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>
/**
* @file
* @brief vHost User Device Driver.
*
* This file contains the source code for vHost User interface.
*/
#define VHOST_USER_DEBUG_SOCKET 0
#define VHOST_DEBUG_VQ 0
#if VHOST_USER_DEBUG_SOCKET == 1
#define DBG_SOCK(args...) clib_warning(args);
#else
#define DBG_SOCK(args...)
#endif
#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
#define UNIX_GET_FD(unixfd_idx) \
(unixfd_idx != ~0) ? \
pool_elt_at_index (unix_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 _
};
/* *INDENT-OFF* */
static vhost_user_main_t vhost_user_main = {
.mtu_bytes = 1518,
};
VNET_HW_INTERFACE_CLASS (vhost_interface_class, static) = {
.name = "vhost-user",
};
/* *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 = __builtin_ctzll (_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);
}
#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)
{
struct statfs s;
fstatfs (fd, &s);
return s.f_bsize;
}
static void
unmap_all_mem_regions (vhost_user_intf_t * vui)
{
int i, r;
for (i = 0; i < vui->nregions; i++)
{
if (vui->region_mmap_addr[i] != (void *) -1)
{
long page_sz = get_huge_page_size (vui->region_mmap_fd[i]);
ssize_t map_sz = (vui->regions[i].memory_size +
vui->regions[i].mmap_offset +
page_sz) & ~(page_sz - 1);
r =
munmap (vui->region_mmap_addr[i] - vui->regions[i].mmap_offset,
map_sz);
DBG_SOCK
("unmap memory region %d addr 0x%lx len 0x%lx page_sz 0x%x", i,
vui->region_mmap_addr[i], map_sz, page_sz);
vui->region_mmap_addr[i] = (void *) -1;
if (r == -1)
{
clib_warning ("failed to unmap memory region (errno %d)",
errno);
}
close (vui->region_mmap_fd[i]);
}
}
vui->nregions = 0;
}
static void
vhost_user_tx_thread_placement (vhost_user_intf_t * vui)
{
//Let's try to assign one queue to each thread
u32 qid = 0;
u32 cpu_index = 0;
vui->use_tx_spinlock = 0;
while (1)
{
for (qid = 0; qid < VHOST_VRING_MAX_N / 2; qid++)
{
vhost_user_vring_t *rxvq = &vui->vrings[VHOST_VRING_IDX_RX (qid)];
if (!rxvq->started || !rxvq->enabled)
continue;
vui->per_cpu_tx_qid[cpu_index] = qid;
cpu_index++;
if (cpu_index == vlib_get_thread_main ()->n_vlib_mains)
return;
}
//We need to loop, meaning the spinlock has to be used
vui->use_tx_spinlock = 1;
if (cpu_index == 0)
{
//Could not find a single valid one
for (cpu_index = 0;
cpu_index < vlib_get_thread_main ()->n_vlib_mains; cpu_index++)
{
vui->per_cpu_tx_qid[cpu_index] = 0;
}
return;
}
}
}
static void
vhost_user_rx_thread_placement ()
{
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
vhost_cpu_t *vhc;
u32 *workers = 0;
u32 cpu_index;
vlib_main_t *vm;
//Let's list all workers cpu indexes
u32 i;
for (i = vum->input_cpu_first_index;
i < vum->input_cpu_first_index + vum->input_cpu_count; i++)
{
vlib_node_set_state (vlib_mains[i], vhost_user_input_node.index,
VLIB_NODE_STATE_DISABLED);
vec_add1 (workers, i);
}
vec_foreach (vhc, vum->cpus)
{
vec_reset_length (vhc->rx_queues);
}
i = 0;
vhost_iface_and_queue_t iaq;
/* *INDENT-OFF* */
pool_foreach (vui, vum->vhost_user_interfaces, {
u32 *vui_workers = vec_len (vui->workers) ? vui->workers : workers;
u32 qid;
for (qid = 0; qid < VHOST_VRING_MAX_N / 2; qid++)
{
vhost_user_vring_t *txvq =
&vui->vrings[VHOST_VRING_IDX_TX (qid)];
if (!txvq->started)
continue;
i %= vec_len (vui_workers);
cpu_index = vui_workers[i];
i++;
vhc = &vum->cpus[cpu_index];
iaq.qid = qid;
iaq.vhost_iface_index = vui - vum->vhost_user_interfaces;
vec_add1 (vhc->rx_queues, iaq);
}
});
/* *INDENT-ON* */
vec_foreach (vhc, vum->cpus)
{
vhost_iface_and_queue_t *vhiq;
u8 mode = VHOST_USER_INTERRUPT_MODE;
vec_foreach (vhiq, vhc->rx_queues)
{
vui = &vum->vhost_user_interfaces[vhiq->vhost_iface_index];
if (vui->operation_mode == VHOST_USER_POLLING_MODE)
{
/* At least one interface is polling, cpu is set to polling */
mode = VHOST_USER_POLLING_MODE;
break;
}
}
vhc->operation_mode = mode;
}
for (cpu_index = vum->input_cpu_first_index;
cpu_index < vum->input_cpu_first_index + vum->input_cpu_count;
cpu_index++)
{
vlib_node_state_t state = VLIB_NODE_STATE_POLLING;
vhc = &vum->cpus[cpu_index];
vm = vlib_mains ? vlib_mains[cpu_index] : &vlib_global_main;
switch (vhc->operation_mode)
{
case VHOST_USER_INTERRUPT_MODE:
state = VLIB_NODE_STATE_INTERRUPT;
break;
case VHOST_USER_POLLING_MODE:
state = VLIB_NODE_STATE_POLLING;
break;
default:
clib_warning ("BUG: bad operation mode %d", vhc->operation_mode);
break;
}
vlib_node_set_state (vm, vhost_user_input_node.index, state);
}
vec_free (workers);
}
static int
vhost_user_thread_placement (u32 sw_if_index, u32 worker_thread_index, u8 del)
{
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
vnet_hw_interface_t *hw;
if (worker_thread_index < vum->input_cpu_first_index ||
worker_thread_index >=
vum->input_cpu_first_index + vum->input_cpu_count)
return -1;
if (!(hw = vnet_get_sup_hw_interface (vnet_get_main (), sw_if_index)))
return -2;
vui = pool_elt_at_index (vum->vhost_user_interfaces, hw->dev_instance);
u32 found = ~0, *w;
vec_foreach (w, vui->workers)
{
if (*w == worker_thread_index)
{
found = w - vui->workers;
break;
}
}
if (del)
{
if (found == ~0)
return -3;
vec_del1 (vui->workers, found);
}
else if (found == ~0)
{
vec_add1 (vui->workers, worker_thread_index);
}
vhost_user_rx_thread_placement ();
return 0;
}
/** @brief Returns whether at least one TX and one RX vring are enabled */
int
vhost_user_intf_ready (vhost_user_intf_t * vui)
{
int i, found[2] = { }; //RX + TX
for (i = 0; i < VHOST_VRING_MAX_N; i++)
if (vui->vrings[i].started && vui->vrings[i].enabled)
found[i & 1] = 1;
return found[0] && found[1];
}
static void
vhost_user_update_iface_state (vhost_user_intf_t * vui)
{
/* if we have pointers to descriptor table, go up */
int is_up = vhost_user_intf_ready (vui);
if (is_up != vui->is_up)
{
DBG_SOCK ("interface %d %s", vui->sw_if_index,
is_up ? "ready" : "down");
vnet_hw_interface_set_flags (vnet_get_main (), vui->hw_if_index,
is_up ? VNET_HW_INTERFACE_FLAG_LINK_UP :
0);
vui->is_up = is_up;
}
vhost_user_rx_thread_placement ();
vhost_user_tx_thread_placement (vui);
}
static void
vhost_user_set_interrupt_pending (vhost_user_intf_t * vui, u32 ifq)
{
vhost_user_main_t *vum = &vhost_user_main;
vhost_cpu_t *vhc;
u32 cpu_index;
vhost_iface_and_queue_t *vhiq;
vlib_main_t *vm;
u32 ifq2;
u8 done = 0;
if (vhost_user_intf_ready (vui))
{
vec_foreach (vhc, vum->cpus)
{
if (vhc->operation_mode == VHOST_USER_POLLING_MODE)
continue;
vec_foreach (vhiq, vhc->rx_queues)
{
/*
* Match the interface and the virtqueue number
*/
if ((vhiq->vhost_iface_index == (ifq >> 8)) &&
(VHOST_VRING_IDX_TX (vhiq->qid) == (ifq & 0xff)))
{
cpu_index = vhc - vum->cpus;
vm = vlib_mains ? vlib_mains[cpu_index] : &vlib_global_main;
/*
* Convert RX virtqueue number in the lower byte to vring
* queue index for the input node process. Top bytes contain
* the interface, lower byte contains the queue index.
*/
ifq2 = ((ifq >> 8) << 8) | vhiq->qid;
vhc->pending_input_bitmap =
clib_bitmap_set (vhc->pending_input_bitmap, ifq2, 1);
vlib_node_set_interrupt_pending (vm,
vhost_user_input_node.index);
done = 1;
break;
}
}
if (done)
break;
}
}
}
static clib_error_t *
vhost_user_callfd_read_ready (unix_file_t * uf)
{
__attribute__ ((unused)) int n;
u8 buff[8];
vhost_user_intf_t *vui =
pool_elt_at_index (vhost_user_main.vhost_user_interfaces,
uf->private_data >> 8);
n = read (uf->file_descriptor, ((char *) &buff), 8);
DBG_SOCK ("if %d CALL queue %d", uf->private_data >> 8,
uf->private_data & 0xff);
vhost_user_set_interrupt_pending (vui, uf->private_data);
return 0;
}
static clib_error_t *
vhost_user_kickfd_read_ready (unix_file_t * uf)
{
__attribute__ ((unused)) int n;
u8 buff[8];
vhost_user_intf_t *vui =
pool_elt_at_index (vhost_user_main.vhost_user_interfaces,
uf->private_data >> 8);
u32 qid = uf->private_data & 0xff;
n = read (uf->file_descriptor, ((char *) &buff), 8);
DBG_SOCK ("if %d KICK queue %d", uf->private_data >> 8, qid);
vlib_worker_thread_barrier_sync (vlib_get_main ());
if (!vui->vrings[qid].started ||
(vhost_user_intf_ready (vui) != vui->is_up))
{
vui->vrings[qid].started = 1;
vhost_user_update_iface_state (vui);
}
vlib_worker_thread_barrier_release (vlib_get_main ());
vhost_user_set_interrupt_pending (vui, uf->private_data);
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
vhost_user_vring_init (vhost_user_intf_t * vui, u32 qid)
{
vhost_user_vring_t *vring = &vui->vrings[qid];
memset (vring, 0, sizeof (*vring));
vring->kickfd_idx = ~0;
vring->callfd_idx = ~0;
vring->errfd = -1;
/*
* We have a bug with some qemu 2.5, and this may be a fix.
* Feel like interpretation holy text, but this is from vhost-user.txt.
* "
* One queue pair is enabled initially. More queues are enabled
* dynamically, by sending message VHOST_USER_SET_VRING_ENABLE.
* "
* Don't know who's right, but this is what DPDK does.
*/
if (qid == 0 || qid == 1)
vring->enabled = 1;
}
static inline void
vhost_user_vring_close (vhost_user_intf_t * vui, u32 qid)
{
vhost_user_vring_t *vring = &vui->vrings[qid];
if (vring->kickfd_idx != ~0)
{
unix_file_t *uf = pool_elt_at_index (unix_main.file_pool,
vring->kickfd_idx);
unix_file_del (&unix_main, uf);
vring->kickfd_idx = ~0;
}
if (vring->callfd_idx != ~0)
{
unix_file_t *uf = pool_elt_at_index (unix_main.file_pool,
vring->callfd_idx);
unix_file_del (&unix_main, uf);
vring->callfd_idx = ~0;
}
if (vring->errfd != -1)
{
close (vring->errfd);
vring->errfd = -1;
}
vhost_user_vring_init (vui, qid);
}
static inline void
vhost_user_if_disconnect (vhost_user_intf_t * vui)
{
vnet_main_t *vnm = vnet_get_main ();
int q;
vnet_hw_interface_set_flags (vnm, vui->hw_if_index, 0);
if (vui->unix_file_index != ~0)
{
unix_file_del (&unix_main, unix_main.file_pool + vui->unix_file_index);
vui->unix_file_index = ~0;
}
vui->is_up = 0;
for (q = 0; q < VHOST_VRING_MAX_N; q++)
vhost_user_vring_close (vui, q);
unmap_all_mem_regions (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 = (u64) 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 (unix_file_t * uf)
{
int n, i;
int fd, number_of_fds = 0;
int fds[VHOST_MEMORY_MAX_NREGIONS];
vhost_user_msg_t msg;
struct msghdr mh;
struct iovec iov[1];
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
struct cmsghdr *cmsg;
u8 q;
unix_file_t template = { 0 };
vnet_main_t *vnm = vnet_get_main ();
vui = pool_elt_at_index (vum->vhost_user_interfaces, uf->private_data);
char control[CMSG_SPACE (VHOST_MEMORY_MAX_NREGIONS * sizeof (int))];
memset (&mh, 0, sizeof (mh));
memset (control, 0, sizeof (control));
for (i = 0; i < VHOST_MEMORY_MAX_NREGIONS; i++)
fds[i] = -1;
/* set the payload */
iov[0].iov_base = (void *) &msg;
iov[0].iov_len = VHOST_USER_MSG_HDR_SZ;
mh.msg_iov = iov;
mh.msg_iovlen = 1;
mh.msg_control = control;
mh.msg_controllen = sizeof (control);
n = recvmsg (uf->file_descriptor, &mh, 0);
/* Stop workers to avoid end of the world */
vlib_worker_thread_barrier_sync (vlib_get_main ());
if (n != VHOST_USER_MSG_HDR_SZ)
{
if (n == -1)
{
DBG_SOCK ("recvmsg returned error %d %s", errno, strerror (errno));
}
else
{
DBG_SOCK ("n (%d) != VHOST_USER_MSG_HDR_SZ (%d)",
n, VHOST_USER_MSG_HDR_SZ);
}
goto close_socket;
}
if (mh.msg_flags & MSG_CTRUNC)
{
DBG_SOCK ("MSG_CTRUNC is set");
goto close_socket;
}
cmsg = CMSG_FIRSTHDR (&mh);
if (cmsg && (cmsg->cmsg_len > 0) && (cmsg->cmsg_level == SOL_SOCKET) &&
(cmsg->cmsg_type == SCM_RIGHTS) &&
(cmsg->cmsg_len - CMSG_LEN (0) <=
VHOST_MEMORY_MAX_NREGIONS * sizeof (int)))
{
number_of_fds = (cmsg->cmsg_len - CMSG_LEN (0)) / sizeof (int);
clib_memcpy (fds, CMSG_DATA (cmsg), number_of_fds * sizeof (int));
}
/* version 1, no reply bit set */
if ((msg.flags & 7) != 1)
{
DBG_SOCK ("malformed message received. closing socket");
goto close_socket;
}
{
int rv;
rv =
read (uf->file_descriptor, ((char *) &msg) + VHOST_USER_MSG_HDR_SZ,
msg.size);
if (rv < 0)
{
DBG_SOCK ("read failed %s", strerror (errno));
goto close_socket;
}
else if (rv != msg.size)
{
DBG_SOCK ("message too short (read %dB should be %dB)", rv, msg.size);
goto close_socket;
}
}
switch (msg.request)
{
case VHOST_USER_GET_FEATURES:
msg.flags |= 4;
msg.u64 = (1ULL << FEAT_VIRTIO_NET_F_MRG_RXBUF) |
(1ULL << FEAT_VIRTIO_NET_F_CTRL_VQ) |
(1ULL << FEAT_VIRTIO_F_ANY_LAYOUT) |
(1ULL << FEAT_VIRTIO_F_INDIRECT_DESC) |
(1ULL << FEAT_VHOST_F_LOG_ALL) |
(1ULL << FEAT_VIRTIO_NET_F_GUEST_ANNOUNCE) |
(1ULL << FEAT_VIRTIO_NET_F_MQ) |
(1ULL << FEAT_VHOST_USER_F_PROTOCOL_FEATURES) |
(1ULL << FEAT_VIRTIO_F_VERSION_1);
msg.u64 &= vui->feature_mask;
msg.size = sizeof (msg.u64);
DBG_SOCK ("if %d msg VHOST_USER_GET_FEATURES - reply 0x%016llx",
vui->hw_if_index, msg.u64);
break;
case VHOST_USER_SET_FEATURES:
DBG_SOCK ("if %d msg VHOST_USER_SET_FEATURES features 0x%016llx",
vui->hw_if_index, msg.u64);
vui->features = msg.u64;
if (vui->features &
((1 << FEAT_VIRTIO_NET_F_MRG_RXBUF) |
(1ULL << FEAT_VIRTIO_F_VERSION_1)))
vui->virtio_net_hdr_sz = 12;
else
vui->virtio_net_hdr_sz = 10;
vui->is_any_layout =
(vui->features & (1 << FEAT_VIRTIO_F_ANY_LAYOUT)) ? 1 : 0;
ASSERT (vui->virtio_net_hdr_sz < VLIB_BUFFER_PRE_DATA_SIZE);
vnet_hw_interface_set_flags (vnm, vui->hw_if_index, 0);
vui->is_up = 0;
/*for (q = 0; q < VHOST_VRING_MAX_N; q++)
vhost_user_vring_close(&vui->vrings[q]); */
break;
case VHOST_USER_SET_MEM_TABLE:
DBG_SOCK ("if %d msg VHOST_USER_SET_MEM_TABLE nregions %d",
vui->hw_if_index, msg.memory.nregions);
if ((msg.memory.nregions < 1) ||
(msg.memory.nregions > VHOST_MEMORY_MAX_NREGIONS))
{
DBG_SOCK ("number of mem regions must be between 1 and %i",
VHOST_MEMORY_MAX_NREGIONS);
goto close_socket;
}
if (msg.memory.nregions != number_of_fds)
{
DBG_SOCK ("each memory region must have FD");
goto close_socket;
}
unmap_all_mem_regions (vui);
for (i = 0; i < msg.memory.nregions; i++)
{
clib_memcpy (&(vui->regions[i]), &msg.memory.regions[i],
sizeof (vhost_user_memory_region_t));
long page_sz = get_huge_page_size (fds[i]);
/* align size to 2M page */
ssize_t map_sz = (vui->regions[i].memory_size +
vui->regions[i].mmap_offset +
page_sz) & ~(page_sz - 1);
vui->region_mmap_addr[i] = mmap (0, map_sz, PROT_READ | PROT_WRITE,
MAP_SHARED, fds[i], 0);
vui->region_guest_addr_lo[i] = vui->regions[i].guest_phys_addr;
vui->region_guest_addr_hi[i] = vui->regions[i].guest_phys_addr +
vui->regions[i].memory_size;
DBG_SOCK
("map memory region %d addr 0 len 0x%lx fd %d mapped 0x%lx "
"page_sz 0x%x", i, map_sz, fds[i], vui->region_mmap_addr[i],
page_sz);
if (vui->region_mmap_addr[i] == MAP_FAILED)
{
clib_warning ("failed to map memory. errno is %d", errno);
goto close_socket;
}
vui->region_mmap_addr[i] += vui->regions[i].mmap_offset;
vui->region_mmap_fd[i] = fds[i];
}
vui->nregions = msg.memory.nregions;
break;
case VHOST_USER_SET_VRING_NUM:
DBG_SOCK ("if %d msg VHOST_USER_SET_VRING_NUM idx %d num %d",
vui->hw_if_index, msg.state.index, msg.state.num);
if ((msg.state.num > 32768) || /* maximum ring size is 32768 */
(msg.state.num == 0) || /* it cannot be zero */
((msg.state.num - 1) & msg.state.num)) /* must be power of 2 */
goto close_socket;
vui->vrings[msg.state.index].qsz = msg.state.num;
break;
case VHOST_USER_SET_VRING_ADDR:
DBG_SOCK ("if %d msg VHOST_USER_SET_VRING_ADDR idx %d",
vui->hw_if_index, msg.state.index);
if (msg.state.index >= VHOST_VRING_MAX_N)
{
DBG_SOCK ("invalid vring index VHOST_USER_SET_VRING_ADDR:"
" %d >= %d", msg.state.index, VHOST_VRING_MAX_N);
goto close_socket;
}
if (msg.size < sizeof (msg.addr))
{
DBG_SOCK ("vhost message is too short (%d < %d)",
msg.size, sizeof (msg.addr));
goto close_socket;
}
vui->vrings[msg.state.index].desc = (vring_desc_t *)
map_user_mem (vui, msg.addr.desc_user_addr);
vui->vrings[msg.state.index].used = (vring_used_t *)
map_user_mem (vui, msg.addr.used_user_addr);
vui->vrings[msg.state.index].avail = (vring_avail_t *)
map_user_mem (vui, msg.addr.avail_user_addr);
if ((vui->vrings[msg.state.index].desc == NULL) ||
(vui->vrings[msg.state.index].used == NULL) ||
(vui->vrings[msg.state.index].avail == NULL))
{
DBG_SOCK ("failed to map user memory for hw_if_index %d",
vui->hw_if_index);
goto close_socket;
}
vui->vrings[msg.state.index].log_guest_addr = msg.addr.log_guest_addr;
vui->vrings[msg.state.index].log_used =
(msg.addr.flags & (1 << VHOST_VRING_F_LOG)) ? 1 : 0;
/* Spec says: If VHOST_USER_F_PROTOCOL_FEATURES has not been negotiated,
the ring is initialized in an enabled state. */
if (!(vui->features & (1 << FEAT_VHOST_USER_F_PROTOCOL_FEATURES)))
{
vui->vrings[msg.state.index].enabled = 1;
}
vui->vrings[msg.state.index].last_used_idx =
vui->vrings[msg.state.index].last_avail_idx =
vui->vrings[msg.state.index].used->idx;
if (vui->operation_mode == VHOST_USER_POLLING_MODE)
/* tell driver that we don't want interrupts */
vui->vrings[msg.state.index].used->flags = VRING_USED_F_NO_NOTIFY;
else
/* tell driver that we want interrupts */
vui->vrings[msg.state.index].used->flags = 0;
break;
case VHOST_USER_SET_OWNER:
DBG_SOCK ("if %d msg VHOST_USER_SET_OWNER", vui->hw_if_index);
break;
case VHOST_USER_RESET_OWNER:
DBG_SOCK ("if %d msg VHOST_USER_RESET_OWNER", vui->hw_if_index);
break;
case VHOST_USER_SET_VRING_CALL:
DBG_SOCK ("if %d msg VHOST_USER_SET_VRING_CALL u64 %d",
vui->hw_if_index, msg.u64);
q = (u8) (msg.u64 & 0xFF);
/* if there is old fd, delete and close it */
if (vui->vrings[q].callfd_idx != ~0)
{
unix_file_t *uf = pool_elt_at_index (unix_main.file_pool,
vui->vrings[q].callfd_idx);
unix_file_del (&unix_main, uf);
vui->vrings[q].callfd_idx = ~0;
}
if (!(msg.u64 & 0x100))
{
if (number_of_fds != 1)
{
DBG_SOCK ("More than one fd received !");
goto close_socket;
}
template.read_function = vhost_user_callfd_read_ready;
template.file_descriptor = fds[0];
template.private_data =
((vui - vhost_user_main.vhost_user_interfaces) << 8) + q;
vui->vrings[q].callfd_idx = unix_file_add (&unix_main, &template);
}
else
vui->vrings[q].callfd_idx = ~0;
break;
case VHOST_USER_SET_VRING_KICK:
DBG_SOCK ("if %d msg VHOST_USER_SET_VRING_KICK u64 %d",
vui->hw_if_index, msg.u64);
q = (u8) (msg.u64 & 0xFF);
if (vui->vrings[q].kickfd_idx != ~0)
{
unix_file_t *uf = pool_elt_at_index (unix_main.file_pool,
vui->vrings[q].kickfd_idx);
unix_file_del (&unix_main, uf);
vui->vrings[q].kickfd_idx = ~0;
}
if (!(msg.u64 & 0x100))
{
if (number_of_fds != 1)
{
DBG_SOCK ("More than one fd received !");
goto close_socket;
}
template.read_function = vhost_user_kickfd_read_ready;
template.file_descriptor = fds[0];
template.private_data =
(((uword) (vui - vhost_user_main.vhost_user_interfaces)) << 8) +
q;
vui->vrings[q].kickfd_idx = unix_file_add (&unix_main, &template);
}
else
{
//When no kickfd is set, the queue is initialized as started
vui->vrings[q].kickfd_idx = ~0;
vui->vrings[q].started = 1;
}
break;
case VHOST_USER_SET_VRING_ERR:
DBG_SOCK ("if %d msg VHOST_USER_SET_VRING_ERR u64 %d",
vui->hw_if_index, msg.u64);
q = (u8) (msg.u64 & 0xFF);
if (vui->vrings[q].errfd != -1)
close (vui->vrings[q].errfd);
if (!(msg.u64 & 0x100))
{
if (number_of_fds != 1)
goto close_socket;
vui->vrings[q].errfd = fds[0];
}
else
vui->vrings[q].errfd = -1;
break;
case VHOST_USER_SET_VRING_BASE:
DBG_SOCK ("if %d msg VHOST_USER_SET_VRING_BASE idx %d num %d",
vui->hw_if_index, msg.state.index, msg.state.num);
vui->vrings[msg.state.index].last_avail_idx = msg.state.num;
break;
case VHOST_USER_GET_VRING_BASE:
DBG_SOCK ("if %d msg VHOST_USER_GET_VRING_BASE idx %d num %d",
vui->hw_if_index, msg.state.index, msg.state.num);
if (msg.state.index >= VHOST_VRING_MAX_N)
{
DBG_SOCK ("invalid vring index VHOST_USER_GET_VRING_BASE:"
" %d >= %d", msg.state.index, VHOST_VRING_MAX_N);
goto close_socket;
}
/*
* Copy last_avail_idx from the vring before closing it because
* closing the vring also initializes the vring last_avail_idx
*/
msg.state.num = vui->vrings[msg.state.index].last_avail_idx;
msg.flags |= 4;
msg.size = sizeof (msg.state);
/* Spec says: Client must [...] stop ring upon receiving VHOST_USER_GET_VRING_BASE. */
vhost_user_vring_close (vui, msg.state.index);
break;
case VHOST_USER_NONE:
DBG_SOCK ("if %d msg VHOST_USER_NONE", vui->hw_if_index);
break;
case VHOST_USER_SET_LOG_BASE:
{
DBG_SOCK ("if %d msg VHOST_USER_SET_LOG_BASE", vui->hw_if_index);
if (msg.size != sizeof (msg.log))
{
DBG_SOCK
("invalid msg size for VHOST_USER_SET_LOG_BASE: %d instead of %d",
msg.size, sizeof (msg.log));
goto close_socket;
}
if (!
(vui->protocol_features & (1 << VHOST_USER_PROTOCOL_F_LOG_SHMFD)))
{
DBG_SOCK
("VHOST_USER_PROTOCOL_F_LOG_SHMFD not set but VHOST_USER_SET_LOG_BASE received");
goto close_socket;
}
fd = fds[0];
/* align size to 2M page */
long page_sz = get_huge_page_size (fd);
ssize_t map_sz =
(msg.log.size + msg.log.offset + page_sz) & ~(page_sz - 1);
vui->log_base_addr = mmap (0, map_sz, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
DBG_SOCK
("map log region addr 0 len 0x%lx off 0x%lx fd %d mapped 0x%lx",
map_sz, msg.log.offset, fd, vui->log_base_addr);
if (vui->log_base_addr == MAP_FAILED)
{
clib_warning ("failed to map memory. errno is %d", errno);
goto close_socket;
}
vui->log_base_addr += msg.log.offset;
vui->log_size = msg.log.size;
msg.flags |= 4;
msg.size = sizeof (msg.u64);
break;
}
case VHOST_USER_SET_LOG_FD:
DBG_SOCK ("if %d msg VHOST_USER_SET_LOG_FD", vui->hw_if_index);
break;
case VHOST_USER_GET_PROTOCOL_FEATURES:
DBG_SOCK ("if %d msg VHOST_USER_GET_PROTOCOL_FEATURES",
vui->hw_if_index);
msg.flags |= 4;
msg.u64 = (1 << VHOST_USER_PROTOCOL_F_LOG_SHMFD) |
(1 << VHOST_USER_PROTOCOL_F_MQ);
msg.size = sizeof (msg.u64);
break;
case VHOST_USER_SET_PROTOCOL_FEATURES:
DBG_SOCK ("if %d msg VHOST_USER_SET_PROTOCOL_FEATURES features 0x%lx",
vui->hw_if_index, msg.u64);
vui->protocol_features = msg.u64;
break;
case VHOST_USER_GET_QUEUE_NUM:
DBG_SOCK ("if %d msg VHOST_USER_GET_QUEUE_NUM", vui->hw_if_index);
msg.flags |= 4;
msg.u64 = VHOST_VRING_MAX_N;
msg.size = sizeof (msg.u64);
break;
case VHOST_USER_SET_VRING_ENABLE:
DBG_SOCK ("if %d VHOST_USER_SET_VRING_ENABLE: %s queue %d",
vui->hw_if_index, msg.state.num ? "enable" : "disable",
msg.state.index);
if (msg.state.index >= VHOST_VRING_MAX_N)
{
DBG_SOCK ("invalid vring index VHOST_USER_SET_VRING_ENABLE:"
" %d >= %d", msg.state.index, VHOST_VRING_MAX_N);
goto close_socket;
}
vui->vrings[msg.state.index].enabled = msg.state.num;
break;
default:
DBG_SOCK ("unknown vhost-user message %d received. closing socket",
msg.request);
goto close_socket;
}
/* if we need to reply */
if (msg.flags & 4)
{
n =
send (uf->file_descriptor, &msg, VHOST_USER_MSG_HDR_SZ + msg.size, 0);
if (n != (msg.size + VHOST_USER_MSG_HDR_SZ))
{
DBG_SOCK ("could not send message response");
goto close_socket;
}
}
vhost_user_update_iface_state (vui);
vlib_worker_thread_barrier_release (vlib_get_main ());
return 0;
close_socket:
vhost_user_if_disconnect (vui);
vhost_user_update_iface_state (vui);
vlib_worker_thread_barrier_release (vlib_get_main ());
return 0;
}
static clib_error_t *
vhost_user_socket_error (unix_file_t * uf)
{
vlib_main_t *vm = vlib_get_main ();
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui =
pool_elt_at_index (vum->vhost_user_interfaces, uf->private_data);
DBG_SOCK ("socket error on if %d", vui->sw_if_index);
vlib_worker_thread_barrier_sync (vm);
vhost_user_if_disconnect (vui);
vhost_user_rx_thread_placement ();
vlib_worker_thread_barrier_release (vm);
return 0;
}
static clib_error_t *
vhost_user_socksvr_accept_ready (unix_file_t * uf)
{
int client_fd, client_len;
struct sockaddr_un client;
unix_file_t template = { 0 };
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
vui = pool_elt_at_index (vum->vhost_user_interfaces, uf->private_data);
client_len = sizeof (client);
client_fd = accept (uf->file_descriptor,
(struct sockaddr *) &client,
(socklen_t *) & client_len);
if (client_fd < 0)
return clib_error_return_unix (0, "accept");
DBG_SOCK ("New client socket for vhost interface %d", vui->sw_if_index);
template.read_function = vhost_user_socket_read;
template.error_function = vhost_user_socket_error;
template.file_descriptor = client_fd;
template.private_data = vui - vhost_user_main.vhost_user_interfaces;
vui->unix_file_index = unix_file_add (&unix_main, &template);
return 0;
}
static clib_error_t *
vhost_user_init (vlib_main_t * vm)
{
clib_error_t *error;
vhost_user_main_t *vum = &vhost_user_main;
vlib_thread_main_t *tm = vlib_get_thread_main ();
vlib_thread_registration_t *tr;
uword *p;
error = vlib_call_init_function (vm, ip4_init);
if (error)
return error;
vum->coalesce_frames = 32;
vum->coalesce_time = 1e-3;
vec_validate (vum->cpus, tm->n_vlib_mains - 1);
vhost_cpu_t *cpu;
vec_foreach (cpu, vum->cpus)
{
/* This is actually not necessary as validate already zeroes it
* Just keeping the loop here for later because I am lazy. */
cpu->rx_buffers_len = 0;
}
/* find out which cpus will be used for input */
vum->input_cpu_first_index = 0;
vum->input_cpu_count = 1;
p = hash_get_mem (tm->thread_registrations_by_name, "workers");
tr = p ? (vlib_thread_registration_t *) p[0] : 0;
if (tr && tr->count > 0)
{
vum->input_cpu_first_index = tr->first_index;
vum->input_cpu_count = tr->count;
}
vum->random = random_default_seed ();
return 0;
}
VLIB_INIT_FUNCTION (vhost_user_init);
static clib_error_t *
vhost_user_exit (vlib_main_t * vm)
{
/* TODO cleanup */
return 0;
}
VLIB_MAIN_LOOP_EXIT_FUNCTION (vhost_user_exit);
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);
uword 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 qsz_mask = txvq->qsz - 1;
u32 last_avail_idx = txvq->last_avail_idx;
u32 desc_current = txvq->avail->ring[last_avail_idx & 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 __attribute__ ((unused));
/* TODO: pay attention to rv */
rv = write (fd, &x, sizeof (x));
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;
u16 qsz_mask = txvq->qsz - 1;
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 & qsz_mask];
txvq->last_avail_idx++;
txvq->used->ring[txvq->last_used_idx & qsz_mask].id = desc_chain_head;
txvq->used->ring[txvq->last_used_idx & qsz_mask].len = 0;
vhost_user_log_dirty_ring (vui, txvq,
ring[txvq->last_used_idx & 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;
}
}
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)
{
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);
u16 qsz_mask;
u32 map_hint = 0;
u16 cpu_index = os_get_cpu_number ();
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);
}
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))
{
/*
* 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);
}
qsz_mask = txvq->qsz - 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.
*/
if (PREDICT_FALSE (vum->cpus[cpu_index].rx_buffers_len < n_left + 1))
{
u32 curr_len = vum->cpus[cpu_index].rx_buffers_len;
vum->cpus[cpu_index].rx_buffers_len +=
vlib_buffer_alloc_from_free_list (vm,
vum->cpus[cpu_index].rx_buffers +
curr_len,
VHOST_USER_RX_BUFFERS_N - curr_len,
VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
if (PREDICT_FALSE
(vum->cpus[cpu_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[cpu_index].rx_buffers_len) ?
n_left + 1 - vum->cpus[cpu_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,
os_get_cpu_number (),
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[cpu_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 & qsz_mask];
vum->cpus[cpu_index].rx_buffers_len--;
bi_current = (vum->cpus[cpu_index].rx_buffers)
[vum->cpus[cpu_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[cpu_index].rx_buffers)
[vum->cpus[cpu_index].
rx_buffers_len - 1], LOAD);
/* Just preset the used descriptor id and length for later */
txvq->used->ring[txvq->last_used_idx & qsz_mask].id = desc_current;
txvq->used->ring[txvq->last_used_idx & qsz_mask].len = 0;
vhost_user_log_dirty_ring (vui, txvq,
ring[txvq->last_used_idx & 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))
{
//FIXME: Handle error by shutdown the queue
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[cpu_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[cpu_index],
b_head);
n_left = 0;
goto stop;
}
/* Get next output */
vum->cpus[cpu_index].rx_buffers_len--;
u32 bi_next =
(vum->cpus[cpu_index].rx_buffers)[vum->cpus
[cpu_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[cpu_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);
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[cpu_index].copy,
copy_len, &map_hint)))
{
clib_warning
("Memory mapping error on interface hw_if_index=%d "
"(Shutting down - Switch interface down and up to restart)",
vui->hw_if_index);
vui->admin_up = 0;
copy_len = 0;
break;
}
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[cpu_index].copy,
copy_len, &map_hint)))
{
clib_warning ("Memory mapping error on interface hw_if_index=%d "
"(Shutting down - Switch interface down and up to restart)",
vui->hw_if_index);
vui->admin_up = 0;
}
/* 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,
os_get_cpu_number (), vui->sw_if_index, n_rx_packets, n_rx_bytes);
vnet_device_increment_rx_packets (cpu_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;
u32 cpu_index = os_get_cpu_number ();
vhost_iface_and_queue_t *vhiq;
vhost_user_intf_t *vui;
vhost_cpu_t *vhc;
vhc = &vum->cpus[cpu_index];
if (PREDICT_TRUE (vhc->operation_mode == VHOST_USER_POLLING_MODE))
{
vec_foreach (vhiq, vum->cpus[cpu_index].rx_queues)
{
vui = &vum->vhost_user_interfaces[vhiq->vhost_iface_index];
n_rx_packets += vhost_user_if_input (vm, vum, vui, vhiq->qid, node);
}
}
else
{
int i;
/* *INDENT-OFF* */
clib_bitmap_foreach (i, vhc->pending_input_bitmap, ({
int qid = i & 0xff;
clib_bitmap_set (vhc->pending_input_bitmap, i, 0);
vui = pool_elt_at_index (vum->vhost_user_interfaces, i >> 8);
n_rx_packets += vhost_user_if_input (vm, vum, vui, qid, node);
}));
/* *INDENT-ON* */
}
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 qsz_mask = rxvq->qsz - 1;
u32 last_avail_idx = rxvq->last_avail_idx;
u32 desc_current = rxvq->avail->ring[last_avail_idx & 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;
u16 qsz_mask;
u8 error;
u32 cpu_index = os_get_cpu_number ();
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, os_get_cpu_number ()));
rxvq = &vui->vrings[qid];
if (PREDICT_FALSE (vui->use_tx_spinlock))
vhost_user_vring_lock (vui, qid);
qsz_mask = rxvq->qsz - 1; /* qsz is always power of 2 */
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[cpu_index].current_trace =
vlib_add_trace (vm, node, b0,
sizeof (*vum->cpus[cpu_index].current_trace));
vhost_user_tx_trace (vum->cpus[cpu_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 & 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[cpu_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[cpu_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[cpu_index].tx_headers[tx_headers_len - 1];
//Move from available to used buffer
rxvq->used->ring[rxvq->last_used_idx & qsz_mask].id =
desc_head;
rxvq->used->ring[rxvq->last_used_idx & qsz_mask].len =
desc_len;
vhost_user_log_dirty_ring (vui, rxvq,
ring[rxvq->last_used_idx &
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 & 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[cpu_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 & qsz_mask].id = desc_head;
rxvq->used->ring[rxvq->last_used_idx & qsz_mask].len = desc_len;
vhost_user_log_dirty_ring (vui, rxvq,
ring[rxvq->last_used_idx & qsz_mask]);
rxvq->last_avail_idx++;
rxvq->last_used_idx++;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
vum->cpus[cpu_index].current_trace->hdr =
vum->cpus[cpu_index].tx_headers[tx_headers_len - 1];
}
n_left--; //At the end for error counting when 'goto done' is invoked
buffers++;
}
done:
//Do the memory copies
if (PREDICT_FALSE
(vhost_user_tx_copy (vui, vum->cpus[cpu_index].copy,
copy_len, &map_hint)))
{
clib_warning ("Memory mapping error on interface hw_if_index=%d "
"(Shutting down - Switch interface down and up to restart)",
vui->hw_if_index);
vui->admin_up = 0;
}
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,
os_get_cpu_number (), vui->sw_if_index, n_left);
}
vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
return frame->n_vectors;
}
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);
uword is_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui =
pool_elt_at_index (vum->vhost_user_interfaces, hif->dev_instance);
vui->admin_up = is_up;
if (is_up)
vnet_hw_interface_set_flags (vnm, vui->hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
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,
.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)
{
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
struct sockaddr_un sun;
int sockfd;
unix_file_t template = { 0 };
f64 timeout = 3153600000.0 /* 100 years */ ;
uword *event_data = 0;
sockfd = -1;
sun.sun_family = AF_UNIX;
template.read_function = vhost_user_socket_read;
template.error_function = vhost_user_socket_error;
while (1)
{
vlib_process_wait_for_event_or_clock (vm, timeout);
vlib_process_get_events (vm, &event_data);
vec_reset_length (event_data);
timeout = 3.0;
/* *INDENT-OFF* */
pool_foreach (vui, vum->vhost_user_interfaces, {
if (vui->unix_server_index == ~0) { //Nothing to do for server sockets
if (vui->unix_file_index == ~0)
{
if ((sockfd < 0) &&
((sockfd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0))
{
/*
* 1st time error or new error for this interface,
* spit out the message and record the error
*/
if (!vui->sock_errno || (vui->sock_errno != errno))
{
clib_unix_warning
("Error: Could not open unix socket for %s",
vui->sock_filename);
vui->sock_errno = errno;
}
continue;
}
/* try to connect */
strncpy (sun.sun_path, (char *) vui->sock_filename,
sizeof (sun.sun_path) - 1);
/* Avoid hanging VPP if the other end does not accept */
if (fcntl(sockfd, F_SETFL, O_NONBLOCK) < 0)
clib_unix_warning ("fcntl");
if (connect (sockfd, (struct sockaddr *) &sun,
sizeof (struct sockaddr_un)) == 0)
{
/* Set the socket to blocking as it was before */
if (fcntl(sockfd, F_SETFL, 0) < 0)
clib_unix_warning ("fcntl2");
vui->sock_errno = 0;
template.file_descriptor = sockfd;
template.private_data =
vui - vhost_user_main.vhost_user_interfaces;
vui->unix_file_index = unix_file_add (&unix_main, &template);
/* This sockfd is considered consumed */
sockfd = -1;
}
else
{
vui->sock_errno = errno;
}
}
else
{
/* check if socket is alive */
int error = 0;
socklen_t len = sizeof (error);
int fd = UNIX_GET_FD(vui->unix_file_index);
int retval =
getsockopt (fd, SOL_SOCKET, SO_ERROR, &error, &len);
if (retval)
{
DBG_SOCK ("getsockopt returned %d", retval);
vhost_user_if_disconnect (vui);
}
}
}
});
/* *INDENT-ON* */
}
return 0;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vhost_user_process_node,static) = {
.function = vhost_user_process,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "vhost-user-process",
};
/* *INDENT-ON* */
/**
* Disables and reset interface structure.
* It can then be either init again, or removed from used interfaces.
*/
static void
vhost_user_term_if (vhost_user_intf_t * vui)
{
int q;
// Delete configured thread pinning
vec_reset_length (vui->workers);
// disconnect interface sockets
vhost_user_if_disconnect (vui);
vhost_user_update_iface_state (vui);
for (q = 0; q < VHOST_VRING_MAX_N; q++)
{
clib_mem_free ((void *) vui->vring_locks[q]);
}
if (vui->unix_server_index != ~0)
{
//Close server socket
unix_file_t *uf = pool_elt_at_index (unix_main.file_pool,
vui->unix_server_index);
unix_file_del (&unix_main, uf);
vui->unix_server_index = ~0;
}
}
int
vhost_user_delete_if (vnet_main_t * vnm, vlib_main_t * vm, u32 sw_if_index)
{
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
int rv = 0;
vnet_hw_interface_t *hwif;
if (!(hwif = vnet_get_sup_hw_interface (vnm, sw_if_index)) ||
hwif->dev_class_index != vhost_user_dev_class.index)
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
DBG_SOCK ("Deleting vhost-user interface %s (instance %d)",
hwif->name, hwif->dev_instance);
vui = pool_elt_at_index (vum->vhost_user_interfaces, hwif->dev_instance);
// Disable and reset interface
vhost_user_term_if (vui);
// Reset renumbered iface
if (hwif->dev_instance <
vec_len (vum->show_dev_instance_by_real_dev_instance))
vum->show_dev_instance_by_real_dev_instance[hwif->dev_instance] = ~0;
// Delete ethernet interface
ethernet_delete_interface (vnm, vui->hw_if_index);
// Back to pool
pool_put (vum->vhost_user_interfaces, vui);
return rv;
}
/**
* Open server unix socket on specified sock_filename.
*/
static int
vhost_user_init_server_sock (const char *sock_filename, int *sock_fd)
{
int rv = 0;
struct sockaddr_un un = { };
int fd;
/* create listening socket */
if ((fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
return VNET_API_ERROR_SYSCALL_ERROR_1;
un.sun_family = AF_UNIX;
strncpy ((char *) un.sun_path, (char *) sock_filename,
sizeof (un.sun_path) - 1);
/* remove if exists */
unlink ((char *) sock_filename);
if (bind (fd, (struct sockaddr *) &un, sizeof (un)) == -1)
{
rv = VNET_API_ERROR_SYSCALL_ERROR_2;
goto error;
}
if (listen (fd, 1) == -1)
{
rv = VNET_API_ERROR_SYSCALL_ERROR_3;
goto error;
}
*sock_fd = fd;
return 0;
error:
close (fd);
return rv;
}
/**
* Create ethernet interface for vhost user interface.
*/
static void
vhost_user_create_ethernet (vnet_main_t * vnm, vlib_main_t * vm,
vhost_user_intf_t * vui, u8 * hwaddress)
{
vhost_user_main_t *vum = &vhost_user_main;
u8 hwaddr[6];
clib_error_t *error;
/* create hw and sw interface */
if (hwaddress)
{
clib_memcpy (hwaddr, hwaddress, 6);
}
else
{
random_u32 (&vum->random);
clib_memcpy (hwaddr + 2, &vum->random, sizeof (vum->random));
hwaddr[0] = 2;
hwaddr[1] = 0xfe;
}
error = ethernet_register_interface
(vnm,
vhost_user_dev_class.index,
vui - vum->vhost_user_interfaces /* device instance */ ,
hwaddr /* ethernet address */ ,
&vui->hw_if_index, 0 /* flag change */ );
if (error)
clib_error_report (error);
vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, vui->hw_if_index);
hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 9000;
}
/*
* Initialize vui with specified attributes
*/
static void
vhost_user_vui_init (vnet_main_t * vnm,
vhost_user_intf_t * vui,
int server_sock_fd,
const char *sock_filename,
u64 feature_mask, u32 * sw_if_index, u8 operation_mode)
{
vnet_sw_interface_t *sw;
sw = vnet_get_hw_sw_interface (vnm, vui->hw_if_index);
int q;
if (server_sock_fd != -1)
{
unix_file_t template = { 0 };
template.read_function = vhost_user_socksvr_accept_ready;
template.file_descriptor = server_sock_fd;
template.private_data = vui - vhost_user_main.vhost_user_interfaces; //hw index
vui->unix_server_index = unix_file_add (&unix_main, &template);
}
else
{
vui->unix_server_index = ~0;
}
vui->sw_if_index = sw->sw_if_index;
strncpy (vui->sock_filename, sock_filename,
ARRAY_LEN (vui->sock_filename) - 1);
vui->sock_errno = 0;
vui->is_up = 0;
vui->feature_mask = feature_mask;
vui->unix_file_index = ~0;
vui->log_base_addr = 0;
vui->operation_mode = operation_mode;
for (q = 0; q < VHOST_VRING_MAX_N; q++)
vhost_user_vring_init (vui, q);
vnet_hw_interface_set_flags (vnm, vui->hw_if_index, 0);
if (sw_if_index)
*sw_if_index = vui->sw_if_index;
for (q = 0; q < VHOST_VRING_MAX_N; q++)
{
vui->vring_locks[q] = clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES,
CLIB_CACHE_LINE_BYTES);
memset ((void *) vui->vring_locks[q], 0, CLIB_CACHE_LINE_BYTES);
}
vec_validate (vui->per_cpu_tx_qid,
vlib_get_thread_main ()->n_vlib_mains - 1);
vhost_user_tx_thread_placement (vui);
}
static uword
vhost_user_send_interrupt_process (vlib_main_t * vm,
vlib_node_runtime_t * rt, vlib_frame_t * f)
{
vhost_user_intf_t *vui;
f64 timeout = 3153600000.0 /* 100 years */ ;
uword event_type, *event_data = 0;
vhost_user_main_t *vum = &vhost_user_main;
vhost_iface_and_queue_t *vhiq;
vhost_cpu_t *vhc;
f64 now, poll_time_remaining;
while (1)
{
poll_time_remaining =
vlib_process_wait_for_event_or_clock (vm, timeout);
event_type = vlib_process_get_events (vm, &event_data);
vec_reset_length (event_data);
/*
* Use the remaining timeout if it is less than coalesce time to avoid
* resetting the existing timer in the middle of expiration
*/
timeout = poll_time_remaining;
if (vlib_process_suspend_time_is_zero (timeout) ||
(timeout > vum->coalesce_time))
timeout = vum->coalesce_time;
now = vlib_time_now (vm);
switch (event_type)
{
case VHOST_USER_EVENT_START_TIMER:
if (!vlib_process_suspend_time_is_zero (poll_time_remaining))
break;
/* fall through */
case ~0:
vec_foreach (vhc, vum->cpus)
{
u32 cpu_index = vhc - vum->cpus;
f64 next_timeout;
next_timeout = timeout;
vec_foreach (vhiq, vum->cpus[cpu_index].rx_queues)
{
vui = &vum->vhost_user_interfaces[vhiq->vhost_iface_index];
vhost_user_vring_t *rxvq =
&vui->vrings[VHOST_VRING_IDX_RX (vhiq->qid)];
vhost_user_vring_t *txvq =
&vui->vrings[VHOST_VRING_IDX_TX (vhiq->qid)];
if (txvq->n_since_last_int)
{
if (now >= txvq->int_deadline)
vhost_user_send_call (vm, txvq);
else
next_timeout = txvq->int_deadline - now;
}
if (rxvq->n_since_last_int)
{
if (now >= rxvq->int_deadline)
vhost_user_send_call (vm, rxvq);
else
next_timeout = rxvq->int_deadline - now;
}
if ((next_timeout < timeout) && (next_timeout > 0.0))
timeout = next_timeout;
}
}
break;
default:
clib_warning ("BUG: unhandled event type %d", event_type);
break;
}
}
return 0;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vhost_user_send_interrupt_node,static) = {
.function = vhost_user_send_interrupt_process,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "vhost-user-send-interrupt-process",
};
/* *INDENT-ON* */
int
vhost_user_create_if (vnet_main_t * vnm, vlib_main_t * vm,
const char *sock_filename,
u8 is_server,
u32 * sw_if_index,
u64 feature_mask,
u8 renumber, u32 custom_dev_instance, u8 * hwaddr,
u8 operation_mode)
{
vhost_user_intf_t *vui = NULL;
u32 sw_if_idx = ~0;
int rv = 0;
int server_sock_fd = -1;
vhost_user_main_t *vum = &vhost_user_main;
if ((operation_mode != VHOST_USER_POLLING_MODE) &&
(operation_mode != VHOST_USER_INTERRUPT_MODE))
return VNET_API_ERROR_UNIMPLEMENTED;
if (sock_filename == NULL || !(strlen (sock_filename) > 0))
{
return VNET_API_ERROR_INVALID_ARGUMENT;
}
if (is_server)
{
if ((rv =
vhost_user_init_server_sock (sock_filename, &server_sock_fd)) != 0)
{
return rv;
}
}
pool_get (vhost_user_main.vhost_user_interfaces, vui);
vhost_user_create_ethernet (vnm, vm, vui, hwaddr);
vhost_user_vui_init (vnm, vui, server_sock_fd, sock_filename,
feature_mask, &sw_if_idx, operation_mode);
if (renumber)
vnet_interface_name_renumber (sw_if_idx, custom_dev_instance);
if (sw_if_index)
*sw_if_index = sw_if_idx;
// Process node must connect
vlib_process_signal_event (vm, vhost_user_process_node.index, 0, 0);
if ((operation_mode == VHOST_USER_INTERRUPT_MODE) &&
!vum->interrupt_mode && (vum->coalesce_time > 0.0) &&
(vum->coalesce_frames > 0))
{
vum->interrupt_mode = 1;
vlib_process_signal_event (vm, vhost_user_send_interrupt_node.index,
VHOST_USER_EVENT_START_TIMER, 0);
}
return rv;
}
int
vhost_user_modify_if (vnet_main_t * vnm, vlib_main_t * vm,
const char *sock_filename,
u8 is_server,
u32 sw_if_index,
u64 feature_mask, u8 renumber, u32 custom_dev_instance,
u8 operation_mode)
{
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui = NULL;
u32 sw_if_idx = ~0;
int server_sock_fd = -1;
int rv = 0;
vnet_hw_interface_t *hwif;
if ((operation_mode != VHOST_USER_POLLING_MODE) &&
(operation_mode != VHOST_USER_INTERRUPT_MODE))
return VNET_API_ERROR_UNIMPLEMENTED;
if (!(hwif = vnet_get_sup_hw_interface (vnm, sw_if_index)) ||
hwif->dev_class_index != vhost_user_dev_class.index)
return VNET_API_ERROR_INVALID_SW_IF_INDEX;
vui = vec_elt_at_index (vum->vhost_user_interfaces, hwif->dev_instance);
// First try to open server socket
if (is_server)
if ((rv = vhost_user_init_server_sock (sock_filename,
&server_sock_fd)) != 0)
return rv;
vhost_user_term_if (vui);
vhost_user_vui_init (vnm, vui, server_sock_fd,
sock_filename, feature_mask, &sw_if_idx,
operation_mode);
if (renumber)
vnet_interface_name_renumber (sw_if_idx, custom_dev_instance);
// Process node must connect
vlib_process_signal_event (vm, vhost_user_process_node.index, 0, 0);
if ((operation_mode == VHOST_USER_INTERRUPT_MODE) &&
!vum->interrupt_mode && (vum->coalesce_time > 0.0) &&
(vum->coalesce_frames > 0))
{
vum->interrupt_mode = 1;
vlib_process_signal_event (vm, vhost_user_send_interrupt_node.index,
VHOST_USER_EVENT_START_TIMER, 0);
}
return rv;
}
static uword
unformat_vhost_user_operation_mode (unformat_input_t * input, va_list * args)
{
u8 *operation_mode = va_arg (*args, u8 *);
uword rc = 1;
if (unformat (input, "interrupt"))
*operation_mode = VHOST_USER_INTERRUPT_MODE;
else if (unformat (input, "polling"))
*operation_mode = VHOST_USER_POLLING_MODE;
else
rc = 0;
return rc;
}
clib_error_t *
vhost_user_connect_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
u8 *sock_filename = NULL;
u32 sw_if_index;
u8 is_server = 0;
u64 feature_mask = (u64) ~ (0ULL);
u8 renumber = 0;
u32 custom_dev_instance = ~0;
u8 hwaddr[6];
u8 *hw = NULL;
clib_error_t *error = NULL;
u8 operation_mode = VHOST_USER_POLLING_MODE;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "socket %s", &sock_filename))
;
else if (unformat (line_input, "server"))
is_server = 1;
else if (unformat (line_input, "feature-mask 0x%llx", &feature_mask))
;
else
if (unformat
(line_input, "hwaddr %U", unformat_ethernet_address, hwaddr))
hw = hwaddr;
else if (unformat (line_input, "renumber %d", &custom_dev_instance))
{
renumber = 1;
}
else if (unformat (line_input, "mode %U",
unformat_vhost_user_operation_mode, &operation_mode))
;
else
{
error = clib_error_return (0, "unknown input `%U'",
format_unformat_error, line_input);
goto done;
}
}
vnet_main_t *vnm = vnet_get_main ();
int rv;
if ((rv = vhost_user_create_if (vnm, vm, (char *) sock_filename,
is_server, &sw_if_index, feature_mask,
renumber, custom_dev_instance, hw,
operation_mode)))
{
error = clib_error_return (0, "vhost_user_create_if returned %d", rv);
goto done;
}
vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name, vnet_get_main (),
sw_if_index);
done:
vec_free (sock_filename);
unformat_free (line_input);
return error;
}
clib_error_t *
vhost_user_delete_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
u32 sw_if_index = ~0;
vnet_main_t *vnm = vnet_get_main ();
clib_error_t *error = NULL;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "sw_if_index %d", &sw_if_index))
;
else if (unformat
(line_input, "%U", unformat_vnet_sw_interface, vnm,
&sw_if_index))
{
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)
{
error = clib_error_return (0, "Not a vhost interface");
goto done;
}
}
else
{
error = clib_error_return (0, "unknown input `%U'",
format_unformat_error, line_input);
goto done;
}
}
vhost_user_delete_if (vnm, vm, sw_if_index);
done:
unformat_free (line_input);
return error;
}
int
vhost_user_dump_ifs (vnet_main_t * vnm, vlib_main_t * vm,
vhost_user_intf_details_t ** out_vuids)
{
int rv = 0;
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
vhost_user_intf_details_t *r_vuids = NULL;
vhost_user_intf_details_t *vuid = NULL;
u32 *hw_if_indices = 0;
vnet_hw_interface_t *hi;
u8 *s = NULL;
int i;
if (!out_vuids)
return -1;
pool_foreach (vui, vum->vhost_user_interfaces,
vec_add1 (hw_if_indices, vui->hw_if_index);
);
for (i = 0; i < vec_len (hw_if_indices); i++)
{
hi = vnet_get_hw_interface (vnm, hw_if_indices[i]);
vui = pool_elt_at_index (vum->vhost_user_interfaces, hi->dev_instance);
vec_add2 (r_vuids, vuid, 1);
vuid->operation_mode = vui->operation_mode;
vuid->sw_if_index = vui->sw_if_index;
vuid->virtio_net_hdr_sz = vui->virtio_net_hdr_sz;
vuid->features = vui->features;
vuid->num_regions = vui->nregions;
vuid->is_server = vui->unix_server_index != ~0;
vuid->sock_errno = vui->sock_errno;
strncpy ((char *) vuid->sock_filename, (char *) vui->sock_filename,
ARRAY_LEN (vuid->sock_filename) - 1);
s = format (s, "%v%c", hi->name, 0);
strncpy ((char *) vuid->if_name, (char *) s,
ARRAY_LEN (vuid->if_name) - 1);
_vec_len (s) = 0;
}
vec_free (s);
vec_free (hw_if_indices);
*out_vuids = r_vuids;
return rv;
}
static u8 *
format_vhost_user_operation_mode (u8 * s, va_list * va)
{
int operation_mode = va_arg (*va, int);
switch (operation_mode)
{
case VHOST_USER_POLLING_MODE:
s = format (s, "%s", "polling");
break;
case VHOST_USER_INTERRUPT_MODE:
s = format (s, "%s", "interrupt");
break;
default:
s = format (s, "%s", "invalid");
}
return s;
}
clib_error_t *
show_vhost_user_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
clib_error_t *error = 0;
vnet_main_t *vnm = vnet_get_main ();
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
u32 hw_if_index, *hw_if_indices = 0;
vnet_hw_interface_t *hi;
vhost_cpu_t *vhc;
vhost_iface_and_queue_t *vhiq;
u32 ci;
int i, j, q;
int show_descr = 0;
struct feat_struct
{
u8 bit;
char *str;
};
struct feat_struct *feat_entry;
static struct feat_struct feat_array[] = {
#define _(s,b) { .str = #s, .bit = b, },
foreach_virtio_net_feature
#undef _
{.str = NULL}
};
#define foreach_protocol_feature \
_(VHOST_USER_PROTOCOL_F_MQ) \
_(VHOST_USER_PROTOCOL_F_LOG_SHMFD)
static struct feat_struct proto_feat_array[] = {
#define _(s) { .str = #s, .bit = s},
foreach_protocol_feature
#undef _
{.str = NULL}
};
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat
(input, "%U", unformat_vnet_hw_interface, vnm, &hw_if_index))
{
vec_add1 (hw_if_indices, hw_if_index);
}
else if (unformat (input, "descriptors") || unformat (input, "desc"))
show_descr = 1;
else
{
error = clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
goto done;
}
}
if (vec_len (hw_if_indices) == 0)
{
pool_foreach (vui, vum->vhost_user_interfaces,
vec_add1 (hw_if_indices, vui->hw_if_index);
);
}
vlib_cli_output (vm, "Virtio vhost-user interfaces");
vlib_cli_output (vm, "Global:\n coalesce frames %d time %e",
vum->coalesce_frames, vum->coalesce_time);
for (i = 0; i < vec_len (hw_if_indices); i++)
{
hi = vnet_get_hw_interface (vnm, hw_if_indices[i]);
vui = pool_elt_at_index (vum->vhost_user_interfaces, hi->dev_instance);
vlib_cli_output (vm, "Interface: %s (ifindex %d)",
hi->name, hw_if_indices[i]);
vlib_cli_output (vm, "virtio_net_hdr_sz %d\n"
" features mask (0x%llx): \n"
" features (0x%llx): \n",
vui->virtio_net_hdr_sz, vui->feature_mask,
vui->features);
feat_entry = (struct feat_struct *) &feat_array;
while (feat_entry->str)
{
if (vui->features & (1ULL << feat_entry->bit))
vlib_cli_output (vm, " %s (%d)", feat_entry->str,
feat_entry->bit);
feat_entry++;
}
vlib_cli_output (vm, " protocol features (0x%llx)",
vui->protocol_features);
feat_entry = (struct feat_struct *) &proto_feat_array;
while (feat_entry->str)
{
if (vui->protocol_features & (1ULL << feat_entry->bit))
vlib_cli_output (vm, " %s (%d)", feat_entry->str,
feat_entry->bit);
feat_entry++;
}
vlib_cli_output (vm, "\n");
vlib_cli_output (vm, " socket filename %s type %s errno \"%s\"\n\n",
vui->sock_filename,
(vui->unix_server_index != ~0) ? "server" : "client",
strerror (vui->sock_errno));
vlib_cli_output (vm, " configured mode: %U\n",
format_vhost_user_operation_mode, vui->operation_mode);
vlib_cli_output (vm, " rx placement: ");
vec_foreach (vhc, vum->cpus)
{
vec_foreach (vhiq, vhc->rx_queues)
{
if (vhiq->vhost_iface_index == vui - vum->vhost_user_interfaces)
{
vlib_cli_output (vm, " thread %d on vring %d\n",
vhc - vum->cpus,
VHOST_VRING_IDX_TX (vhiq->qid));
vlib_cli_output (vm, " mode: %U\n",
format_vhost_user_operation_mode,
vhc->operation_mode);
}
}
}
vlib_cli_output (vm, " tx placement: %s\n",
vui->use_tx_spinlock ? "spin-lock" : "lock-free");
vec_foreach_index (ci, vui->per_cpu_tx_qid)
{
vlib_cli_output (vm, " thread %d on vring %d\n", ci,
VHOST_VRING_IDX_RX (vui->per_cpu_tx_qid[ci]));
}
vlib_cli_output (vm, "\n");
vlib_cli_output (vm, " Memory regions (total %d)\n", vui->nregions);
if (vui->nregions)
{
vlib_cli_output (vm,
" region fd guest_phys_addr memory_size userspace_addr mmap_offset mmap_addr\n");
vlib_cli_output (vm,
" ====== ===== ================== ================== ================== ================== ==================\n");
}
for (j = 0; j < vui->nregions; j++)
{
vlib_cli_output (vm,
" %d %-5d 0x%016lx 0x%016lx 0x%016lx 0x%016lx 0x%016lx\n",
j, vui->region_mmap_fd[j],
vui->regions[j].guest_phys_addr,
vui->regions[j].memory_size,
vui->regions[j].userspace_addr,
vui->regions[j].mmap_offset,
pointer_to_uword (vui->region_mmap_addr[j]));
}
for (q = 0; q < VHOST_VRING_MAX_N; q++)
{
if (!vui->vrings[q].started)
continue;
vlib_cli_output (vm, "\n Virtqueue %d (%s%s)\n", q,
(q & 1) ? "RX" : "TX",
vui->vrings[q].enabled ? "" : " disabled");
vlib_cli_output (vm,
" qsz %d last_avail_idx %d last_used_idx %d\n",
vui->vrings[q].qsz, vui->vrings[q].last_avail_idx,
vui->vrings[q].last_used_idx);
if (vui->vrings[q].avail && vui->vrings[q].used)
vlib_cli_output (vm,
" avail.flags %x avail.idx %d used.flags %x used.idx %d\n",
vui->vrings[q].avail->flags,
vui->vrings[q].avail->idx,
vui->vrings[q].used->flags,
vui->vrings[q].used->idx);
int kickfd = UNIX_GET_FD (vui->vrings[q].kickfd_idx);
int callfd = UNIX_GET_FD (vui->vrings[q].callfd_idx);
vlib_cli_output (vm, " kickfd %d callfd %d errfd %d\n",
kickfd, callfd, vui->vrings[q].errfd);
if (show_descr)
{
vlib_cli_output (vm, "\n descriptor table:\n");
vlib_cli_output (vm,
" id addr len flags next user_addr\n");
vlib_cli_output (vm,
" ===== ================== ===== ====== ===== ==================\n");
for (j = 0; j < vui->vrings[q].qsz; j++)
{
u32 mem_hint = 0;
vlib_cli_output (vm,
" %-5d 0x%016lx %-5d 0x%04x %-5d 0x%016lx\n",
j, vui->vrings[q].desc[j].addr,
vui->vrings[q].desc[j].len,
vui->vrings[q].desc[j].flags,
vui->vrings[q].desc[j].next,
pointer_to_uword (map_guest_mem
(vui,
vui->vrings[q].desc[j].
addr, &mem_hint)));
}
}
}
vlib_cli_output (vm, "\n");
}
done:
vec_free (hw_if_indices);
return error;
}
/*
* CLI functions
*/
/*?
* Create a vHost User interface. Once created, a new virtual interface
* will exist with the name '<em>VirtualEthernet0/0/x</em>', where '<em>x</em>'
* is the next free index.
*
* There are several parameters associated with a vHost interface:
*
* - <b>socket <socket-filename></b> - Name of the linux socket used by QEMU/VM and
* VPP to manage the vHost interface. If socket does not already exist, VPP will
* create the socket.
*
* - <b>server</b> - Optional flag to indicate that VPP should be the server for the
* linux socket. If not provided, VPP will be the client.
*
* - <b>feature-mask <hex></b> - Optional virtio/vhost feature set negotiated at
* startup. By default, all supported features will be advertised. Otherwise,
* provide the set of features desired.
* - 0x000008000 (15) - VIRTIO_NET_F_MRG_RXBUF
* - 0x000020000 (17) - VIRTIO_NET_F_CTRL_VQ
* - 0x000200000 (21) - VIRTIO_NET_F_GUEST_ANNOUNCE
* - 0x000400000 (22) - VIRTIO_NET_F_MQ
* - 0x004000000 (26) - VHOST_F_LOG_ALL
* - 0x008000000 (27) - VIRTIO_F_ANY_LAYOUT
* - 0x010000000 (28) - VIRTIO_F_INDIRECT_DESC
* - 0x040000000 (30) - VHOST_USER_F_PROTOCOL_FEATURES
* - 0x100000000 (32) - VIRTIO_F_VERSION_1
*
* - <b>hwaddr <mac-addr></b> - Optional ethernet address, can be in either
* X:X:X:X:X:X unix or X.X.X cisco format.
*
* - <b>renumber <dev_instance></b> - Optional parameter which allows the instance
* in the name to be specified. If instance already exists, name will be used
* anyway and multiple instances will have the same name. Use with caution.
*
* - <b>mode [interrupt | polling]</b> - Optional parameter specifying
* the input thread polling policy.
*
* @cliexpar
* Example of how to create a vhost interface with VPP as the client and all features enabled:
* @cliexstart{create vhost-user socket /tmp/vhost1.sock}
* VirtualEthernet0/0/0
* @cliexend
* Example of how to create a vhost interface with VPP as the server and with just
* multiple queues enabled:
* @cliexstart{create vhost-user socket /tmp/vhost2.sock server feature-mask 0x40400000}
* VirtualEthernet0/0/1
* @cliexend
* Once the vHost interface is created, enable the interface using:
* @cliexcmd{set interface state VirtualEthernet0/0/0 up}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (vhost_user_connect_command, static) = {
.path = "create vhost-user",
.short_help = "create vhost-user socket <socket-filename> [server] "
"[feature-mask <hex>] [hwaddr <mac-addr>] [renumber <dev_instance>] "
"[mode {interrupt | polling}]",
.function = vhost_user_connect_command_fn,
};
/* *INDENT-ON* */
/*?
* Delete a vHost User interface using the interface name or the
* software interface index. Use the '<em>show interface</em>'
* command to determine the software interface index. On deletion,
* the linux socket will not be deleted.
*
* @cliexpar
* Example of how to delete a vhost interface by name:
* @cliexcmd{delete vhost-user VirtualEthernet0/0/1}
* Example of how to delete a vhost interface by software interface index:
* @cliexcmd{delete vhost-user sw_if_index 1}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (vhost_user_delete_command, static) = {
.path = "delete vhost-user",
.short_help = "delete vhost-user {<interface> | sw_if_index <sw_idx>}",
.function = vhost_user_delete_command_fn,
};
/*?
* Display the attributes of a single vHost User interface (provide interface
* name), multiple vHost User interfaces (provide a list of interface names seperated
* by spaces) or all Vhost User interfaces (omit an interface name to display all
* vHost interfaces).
*
* @cliexpar
* @parblock
* Example of how to display a vhost interface:
* @cliexstart{show vhost-user VirtualEthernet0/0/0}
* Virtio vhost-user interfaces
* Global:
* coalesce frames 32 time 1e-3
* Interface: VirtualEthernet0/0/0 (ifindex 1)
* virtio_net_hdr_sz 12
* features mask (0xffffffffffffffff):
* features (0x50408000):
* VIRTIO_NET_F_MRG_RXBUF (15)
* VIRTIO_NET_F_MQ (22)
* VIRTIO_F_INDIRECT_DESC (28)
* VHOST_USER_F_PROTOCOL_FEATURES (30)
* protocol features (0x3)
* VHOST_USER_PROTOCOL_F_MQ (0)
* VHOST_USER_PROTOCOL_F_LOG_SHMFD (1)
*
* socket filename /tmp/vhost1.sock type client errno "Success"
*
* rx placement:
* thread 1 on vring 1
* thread 1 on vring 5
* thread 2 on vring 3
* thread 2 on vring 7
* tx placement: spin-lock
* thread 0 on vring 0
* thread 1 on vring 2
* thread 2 on vring 0
*
* Memory regions (total 2)
* region fd guest_phys_addr memory_size userspace_addr mmap_offset mmap_addr
* ====== ===== ================== ================== ================== ================== ==================
* 0 60 0x0000000000000000 0x00000000000a0000 0x00002aaaaac00000 0x0000000000000000 0x00002aab2b400000
* 1 61 0x00000000000c0000 0x000000003ff40000 0x00002aaaaacc0000 0x00000000000c0000 0x00002aababcc0000
*
* Virtqueue 0 (TX)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 128 used.flags 1 used.idx 0
* kickfd 62 callfd 64 errfd -1
*
* Virtqueue 1 (RX)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
* kickfd 65 callfd 66 errfd -1
*
* Virtqueue 2 (TX)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 128 used.flags 1 used.idx 0
* kickfd 63 callfd 70 errfd -1
*
* Virtqueue 3 (RX)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
* kickfd 72 callfd 74 errfd -1
*
* Virtqueue 4 (TX disabled)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
* kickfd 76 callfd 78 errfd -1
*
* Virtqueue 5 (RX disabled)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
* kickfd 80 callfd 82 errfd -1
*
* Virtqueue 6 (TX disabled)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
* kickfd 84 callfd 86 errfd -1
*
* Virtqueue 7 (RX disabled)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 0 used.flags 1 used.idx 0
* kickfd 88 callfd 90 errfd -1
*
* @cliexend
*
* The optional '<em>descriptors</em>' parameter will display the same output as
* the previous example but will include the descriptor table for each queue.
* The output is truncated below:
* @cliexstart{show vhost-user VirtualEthernet0/0/0 descriptors}
* Virtio vhost-user interfaces
* Global:
* coalesce frames 32 time 1e-3
* Interface: VirtualEthernet0/0/0 (ifindex 1)
* virtio_net_hdr_sz 12
* features mask (0xffffffffffffffff):
* features (0x50408000):
* VIRTIO_NET_F_MRG_RXBUF (15)
* VIRTIO_NET_F_MQ (22)
* :
* Virtqueue 0 (TX)
* qsz 256 last_avail_idx 0 last_used_idx 0
* avail.flags 1 avail.idx 128 used.flags 1 used.idx 0
* kickfd 62 callfd 64 errfd -1
*
* descriptor table:
* id addr len flags next user_addr
* ===== ================== ===== ====== ===== ==================
* 0 0x0000000010b6e974 2060 0x0002 1 0x00002aabbc76e974
* 1 0x0000000010b6e034 2060 0x0002 2 0x00002aabbc76e034
* 2 0x0000000010b6d6f4 2060 0x0002 3 0x00002aabbc76d6f4
* 3 0x0000000010b6cdb4 2060 0x0002 4 0x00002aabbc76cdb4
* 4 0x0000000010b6c474 2060 0x0002 5 0x00002aabbc76c474
* 5 0x0000000010b6bb34 2060 0x0002 6 0x00002aabbc76bb34
* 6 0x0000000010b6b1f4 2060 0x0002 7 0x00002aabbc76b1f4
* 7 0x0000000010b6a8b4 2060 0x0002 8 0x00002aabbc76a8b4
* 8 0x0000000010b69f74 2060 0x0002 9 0x00002aabbc769f74
* 9 0x0000000010b69634 2060 0x0002 10 0x00002aabbc769634
* 10 0x0000000010b68cf4 2060 0x0002 11 0x00002aabbc768cf4
* :
* 249 0x0000000000000000 0 0x0000 250 0x00002aab2b400000
* 250 0x0000000000000000 0 0x0000 251 0x00002aab2b400000
* 251 0x0000000000000000 0 0x0000 252 0x00002aab2b400000
* 252 0x0000000000000000 0 0x0000 253 0x00002aab2b400000
* 253 0x0000000000000000 0 0x0000 254 0x00002aab2b400000
* 254 0x0000000000000000 0 0x0000 255 0x00002aab2b400000
* 255 0x0000000000000000 0 0x0000 32768 0x00002aab2b400000
*
* Virtqueue 1 (RX)
* qsz 256 last_avail_idx 0 last_used_idx 0
* :
* @cliexend
* @endparblock
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_vhost_user_command, static) = {
.path = "show vhost-user",
.short_help = "show vhost-user [<interface> [<interface> [..]]] [descriptors]",
.function = show_vhost_user_command_fn,
};
/* *INDENT-ON* */
static clib_error_t *
vhost_user_config (vlib_main_t * vm, unformat_input_t * input)
{
vhost_user_main_t *vum = &vhost_user_main;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "coalesce-frames %d", &vum->coalesce_frames))
;
else if (unformat (input, "coalesce-time %f", &vum->coalesce_time))
;
else if (unformat (input, "dont-dump-memory"))
vum->dont_dump_vhost_user_memory = 1;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
return 0;
}
/* vhost-user { ... } configuration. */
VLIB_CONFIG_FUNCTION (vhost_user_config, "vhost-user");
void
vhost_user_unmap_all (void)
{
vhost_user_main_t *vum = &vhost_user_main;
vhost_user_intf_t *vui;
if (vum->dont_dump_vhost_user_memory)
{
pool_foreach (vui, vum->vhost_user_interfaces,
unmap_all_mem_regions (vui);
);
}
}
static clib_error_t *
vhost_thread_command_fn (vlib_main_t * vm,
unformat_input_t * input, vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, *line_input = &_line_input;
u32 worker_thread_index;
u32 sw_if_index;
u8 del = 0;
int rv;
clib_error_t *error = NULL;
/* Get a line of input. */
if (!unformat_user (input, unformat_line_input, line_input))
return 0;
if (!unformat
(line_input, "%U %d", unformat_vnet_sw_interface, vnet_get_main (),
&sw_if_index, &worker_thread_index))
{
error = clib_error_return (0, "unknown input `%U'",
format_unformat_error, line_input);
goto done;
}
if (unformat (line_input, "del"))
del = 1;
if ((rv =
vhost_user_thread_placement (sw_if_index, worker_thread_index, del)))
{
error = clib_error_return (0, "vhost_user_thread_placement returned %d",
rv);
goto done;
}
done:
unformat_free (line_input);
return error;
}
/*?
* This command is used to move the RX processing for the given
* interfaces to the provided thread. If the '<em>del</em>' option is used,
* the forced thread assignment is removed and the thread assigment is
* reassigned automatically. Use '<em>show vhost-user <interface></em>'
* to see the thread assignment.
*
* @cliexpar
* Example of how to move the RX processing for a given interface to a given thread:
* @cliexcmd{vhost thread VirtualEthernet0/0/0 1}
* Example of how to remove the forced thread assignment for a given interface:
* @cliexcmd{vhost thread VirtualEthernet0/0/0 1 del}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (vhost_user_thread_command, static) = {
.path = "vhost thread",
.short_help = "vhost thread <iface> <worker-index> [del]",
.function = vhost_thread_command_fn,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/