-/*-
- * BSD LICENSE
- *
- * Copyright(c) 2016 Intel Corporation. All rights reserved.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2016 Intel Corporation
*/
#include <sys/types.h>
[VHOST_USER_SET_MEM_TABLE] = VHOST_SET_MEM_TABLE,
};
-/* By default, vhost kernel module allows 64 regions, but DPDK allows
- * 256 segments. As a relief, below function merges those virtually
- * adjacent memsegs into one region.
+static int
+add_memseg_list(const struct rte_memseg_list *msl, void *arg)
+{
+ struct vhost_memory_kernel *vm = arg;
+ struct vhost_memory_region *mr;
+ void *start_addr;
+ uint64_t len;
+
+ if (msl->external)
+ return 0;
+
+ if (vm->nregions >= max_regions)
+ return -1;
+
+ start_addr = msl->base_va;
+ len = msl->page_sz * msl->memseg_arr.len;
+
+ mr = &vm->regions[vm->nregions++];
+
+ mr->guest_phys_addr = (uint64_t)(uintptr_t)start_addr;
+ mr->userspace_addr = (uint64_t)(uintptr_t)start_addr;
+ mr->memory_size = len;
+ mr->mmap_offset = 0; /* flags_padding */
+
+ PMD_DRV_LOG(DEBUG, "index=%u addr=%p len=%" PRIu64,
+ vm->nregions - 1, start_addr, len);
+
+ return 0;
+}
+
+/* By default, vhost kernel module allows 64 regions, but DPDK may
+ * have much more memory regions. Below function will treat each
+ * contiguous memory space reserved by DPDK as one region.
*/
static struct vhost_memory_kernel *
prepare_vhost_memory_kernel(void)
{
- uint32_t i, j, k = 0;
- struct rte_memseg *seg;
- struct vhost_memory_region *mr;
struct vhost_memory_kernel *vm;
vm = malloc(sizeof(struct vhost_memory_kernel) +
- max_regions *
- sizeof(struct vhost_memory_region));
+ max_regions *
+ sizeof(struct vhost_memory_region));
+ if (!vm)
+ return NULL;
- for (i = 0; i < RTE_MAX_MEMSEG; ++i) {
- seg = &rte_eal_get_configuration()->mem_config->memseg[i];
- if (!seg->addr)
- break;
+ vm->nregions = 0;
+ vm->padding = 0;
- int new_region = 1;
+ /*
+ * The memory lock has already been taken by memory subsystem
+ * or virtio_user_start_device().
+ */
+ if (rte_memseg_list_walk_thread_unsafe(add_memseg_list, vm) < 0) {
+ free(vm);
+ return NULL;
+ }
- for (j = 0; j < k; ++j) {
- mr = &vm->regions[j];
+ return vm;
+}
- if (mr->userspace_addr + mr->memory_size ==
- (uint64_t)(uintptr_t)seg->addr) {
- mr->memory_size += seg->len;
- new_region = 0;
- break;
- }
-
- if ((uint64_t)(uintptr_t)seg->addr + seg->len ==
- mr->userspace_addr) {
- mr->guest_phys_addr =
- (uint64_t)(uintptr_t)seg->addr;
- mr->userspace_addr =
- (uint64_t)(uintptr_t)seg->addr;
- mr->memory_size += seg->len;
- new_region = 0;
- break;
- }
- }
+/* with below features, vhost kernel does not need to do the checksum and TSO,
+ * these info will be passed to virtio_user through virtio net header.
+ */
+#define VHOST_KERNEL_GUEST_OFFLOADS_MASK \
+ ((1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
+ (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
+ (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
+ (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
+ (1ULL << VIRTIO_NET_F_GUEST_UFO))
+
+/* with below features, when flows from virtio_user to vhost kernel
+ * (1) if flows goes up through the kernel networking stack, it does not need
+ * to verify checksum, which can save CPU cycles;
+ * (2) if flows goes through a Linux bridge and outside from an interface
+ * (kernel driver), checksum and TSO will be done by GSO in kernel or even
+ * offloaded into real physical device.
+ */
+#define VHOST_KERNEL_HOST_OFFLOADS_MASK \
+ ((1ULL << VIRTIO_NET_F_HOST_TSO4) | \
+ (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
+ (1ULL << VIRTIO_NET_F_CSUM))
- if (new_region == 0)
- continue;
+static unsigned int
+tap_support_features(void)
+{
+ int tapfd;
+ unsigned int tap_features;
- mr = &vm->regions[k++];
- /* use vaddr here! */
- mr->guest_phys_addr = (uint64_t)(uintptr_t)seg->addr;
- mr->userspace_addr = (uint64_t)(uintptr_t)seg->addr;
- mr->memory_size = seg->len;
- mr->mmap_offset = 0;
+ tapfd = open(PATH_NET_TUN, O_RDWR);
+ if (tapfd < 0) {
+ PMD_DRV_LOG(ERR, "fail to open %s: %s",
+ PATH_NET_TUN, strerror(errno));
+ return -1;
+ }
- if (k >= max_regions) {
- free(vm);
- return NULL;
- }
+ if (ioctl(tapfd, TUNGETFEATURES, &tap_features) == -1) {
+ PMD_DRV_LOG(ERR, "TUNGETFEATURES failed: %s", strerror(errno));
+ close(tapfd);
+ return -1;
}
- vm->nregions = k;
- vm->padding = 0;
- return vm;
+ close(tapfd);
+ return tap_features;
}
static int
unsigned int i;
uint64_t req_kernel;
struct vhost_memory_kernel *vm = NULL;
+ int vhostfd;
+ unsigned int queue_sel;
+ unsigned int features;
PMD_DRV_LOG(INFO, "%s", vhost_msg_strings[req]);
arg = (void *)vm;
}
- /* We don't need memory protection here */
- if (req_kernel == VHOST_SET_FEATURES)
+ if (req_kernel == VHOST_SET_FEATURES) {
+ /* We don't need memory protection here */
*(uint64_t *)arg &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
- for (i = 0; i < dev->max_queue_pairs; ++i) {
- if (dev->vhostfds[i] < 0)
- continue;
+ /* VHOST kernel does not know about below flags */
+ *(uint64_t *)arg &= ~VHOST_KERNEL_GUEST_OFFLOADS_MASK;
+ *(uint64_t *)arg &= ~VHOST_KERNEL_HOST_OFFLOADS_MASK;
+
+ *(uint64_t *)arg &= ~(1ULL << VIRTIO_NET_F_MQ);
+ }
+
+ switch (req_kernel) {
+ case VHOST_SET_VRING_NUM:
+ case VHOST_SET_VRING_ADDR:
+ case VHOST_SET_VRING_BASE:
+ case VHOST_GET_VRING_BASE:
+ case VHOST_SET_VRING_KICK:
+ case VHOST_SET_VRING_CALL:
+ queue_sel = *(unsigned int *)arg;
+ vhostfd = dev->vhostfds[queue_sel / 2];
+ *(unsigned int *)arg = queue_sel % 2;
+ PMD_DRV_LOG(DEBUG, "vhostfd=%d, index=%u",
+ vhostfd, *(unsigned int *)arg);
+ break;
+ default:
+ vhostfd = -1;
+ }
+ if (vhostfd == -1) {
+ for (i = 0; i < dev->max_queue_pairs; ++i) {
+ if (dev->vhostfds[i] < 0)
+ continue;
+
+ ret = ioctl(dev->vhostfds[i], req_kernel, arg);
+ if (ret < 0)
+ break;
+ }
+ } else {
+ ret = ioctl(vhostfd, req_kernel, arg);
+ }
+
+ if (!ret && req_kernel == VHOST_GET_FEATURES) {
+ features = tap_support_features();
+ /* with tap as the backend, all these features are supported
+ * but not claimed by vhost-net, so we add them back when
+ * reporting to upper layer.
+ */
+ if (features & IFF_VNET_HDR) {
+ *((uint64_t *)arg) |= VHOST_KERNEL_GUEST_OFFLOADS_MASK;
+ *((uint64_t *)arg) |= VHOST_KERNEL_HOST_OFFLOADS_MASK;
+ }
- ret = ioctl(dev->vhostfds[i], req_kernel, arg);
- if (ret < 0)
- break;
+ /* vhost_kernel will not declare this feature, but it does
+ * support multi-queue.
+ */
+ if (features & IFF_MULTI_QUEUE)
+ *(uint64_t *)arg |= (1ull << VIRTIO_NET_F_MQ);
}
if (vm)
int hdr_size;
int vhostfd;
int tapfd;
+ int req_mq = (dev->max_queue_pairs > 1);
vhostfd = dev->vhostfds[pair_idx];
if (!enable) {
- if (dev->tapfds[pair_idx]) {
+ if (dev->tapfds[pair_idx] >= 0) {
close(dev->tapfds[pair_idx]);
dev->tapfds[pair_idx] = -1;
}
else
hdr_size = sizeof(struct virtio_net_hdr);
- tapfd = vhost_kernel_open_tap(&dev->ifname, hdr_size);
+ tapfd = vhost_kernel_open_tap(&dev->ifname, hdr_size, req_mq,
+ (char *)dev->mac_addr, dev->features);
if (tapfd < 0) {
PMD_DRV_LOG(ERR, "fail to open tap for vhost kernel");
return -1;
return 0;
}
-struct virtio_user_backend_ops ops_kernel = {
+struct virtio_user_backend_ops virtio_ops_kernel = {
.setup = vhost_kernel_setup,
.send_request = vhost_kernel_ioctl,
.enable_qp = vhost_kernel_enable_queue_pair
git.droids-corp.org / dpdk.git / blobdiff