This patch checks negotiated features to see if necessary to offload
before set the tap device offload capabilities. It also checks if kernel
support the TUNSETOFFLOAD operation.
Signed-off-by: eric zhang <eric.zh...@windriver.com>
---
v3:
* make other offloading features depend on CSUM
* check IFF_VNET_HDR support when handling VHOST_GET_FEATURES
---
v2:
* don't return failure when failed to set offload to tap
* check if offloads available when handling VHOST_GET_FEATURES
---
drivers/net/virtio/virtio_user/vhost_kernel.c | 18 +++++---
drivers/net/virtio/virtio_user/vhost_kernel_tap.c | 56 +++++++++++++++++------
drivers/net/virtio/virtio_user/vhost_kernel_tap.h | 2 +-
3 files changed, 54 insertions(+), 22 deletions(-)
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c
b/drivers/net/virtio/virtio_user/vhost_kernel.c
index dd24b6b..3502001 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel.c
+++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
@@ -189,8 +189,8 @@ struct vhost_memory_kernel {
(1ULL << VIRTIO_NET_F_HOST_TSO6) | \
(1ULL << VIRTIO_NET_F_CSUM))
-static int
-tap_supporte_mq(void)
+static unsigned int
+tap_support_features(void)
{
int tapfd;
unsigned int tap_features;
@@ -209,7 +209,7 @@ struct vhost_memory_kernel {
}
close(tapfd);
- return tap_features & IFF_MULTI_QUEUE;
+ return tap_features;
}
static int
@@ -223,6 +223,7 @@ struct vhost_memory_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]);
@@ -276,17 +277,20 @@ struct vhost_memory_kernel {
}
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.
*/
- *((uint64_t *)arg) |= VHOST_KERNEL_GUEST_OFFLOADS_MASK;
- *((uint64_t *)arg) |= VHOST_KERNEL_HOST_OFFLOADS_MASK;
+ if (features & IFF_VNET_HDR) {
+ *((uint64_t *)arg) |= VHOST_KERNEL_GUEST_OFFLOADS_MASK;
+ *((uint64_t *)arg) |= VHOST_KERNEL_HOST_OFFLOADS_MASK;
+ }
/* vhost_kernel will not declare this feature, but it does
* support multi-queue.
*/
- if (tap_supporte_mq())
+ if (features & IFF_MULTI_QUEUE)
*(uint64_t *)arg |= (1ull << VIRTIO_NET_F_MQ);
}
@@ -381,7 +385,7 @@ struct vhost_memory_kernel {
hdr_size = sizeof(struct virtio_net_hdr);
tapfd = vhost_kernel_open_tap(&dev->ifname, hdr_size, req_mq,
- (char *)dev->mac_addr);
+ (char *)dev->mac_addr, dev->features);
if (tapfd < 0) {
PMD_DRV_LOG(ERR, "fail to open tap for vhost kernel");
return -1;
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
index d036428..e9ee774 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
+++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.c
@@ -45,21 +45,55 @@
#include "vhost_kernel_tap.h"
#include "../virtio_logs.h"
+#include "../virtio_pci.h"
+
+static int
+vhost_kernel_tap_set_offload(int fd, uint64_t features)
+{
+ unsigned int offload = 0;
+
+ if (features & (1ULL << VIRTIO_NET_F_GUEST_CSUM)) {
+ offload |= TUN_F_CSUM;
+ if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO4))
+ offload |= TUN_F_TSO4;
+ if (features & (1ULL << VIRTIO_NET_F_GUEST_TSO6))
+ offload |= TUN_F_TSO6;
+ if (features & ((1ULL << VIRTIO_NET_F_GUEST_TSO4) |
+ (1ULL << VIRTIO_NET_F_GUEST_TSO6)) &&
+ (features & (1ULL << VIRTIO_NET_F_GUEST_ECN)))
+ offload |= TUN_F_TSO_ECN;
+ if (features & (1ULL << VIRTIO_NET_F_GUEST_UFO))
+ offload |= TUN_F_UFO;
+ }
+
+ if (offload != 0) {
+ /* Check if our kernel supports TUNSETOFFLOAD */
+ if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
+ PMD_DRV_LOG(ERR, "Kernel does't support
TUNSETOFFLOAD\n");
+ return -ENOTSUP;
+ }
+
+ if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
+ offload &= ~TUN_F_UFO;
+ if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
+ PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed:
%s\n",
+ strerror(errno));
+ return -1;
+ }
+ }
+ }
+
+ return 0;
+}
int
vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
- const char *mac)
+ const char *mac, uint64_t features)
{
unsigned int tap_features;
int sndbuf = INT_MAX;
struct ifreq ifr;
int tapfd;
- unsigned int offload =
- TUN_F_CSUM |
- TUN_F_TSO4 |
- TUN_F_TSO6 |
- TUN_F_TSO_ECN |
- TUN_F_UFO;
/* TODO:
* 1. verify we can get/set vnet_hdr_len, tap_probe_vnet_hdr_len
@@ -119,13 +153,7 @@
goto error;
}
- /* TODO: before set the offload capabilities, we'd better (1) check
- * negotiated features to see if necessary to offload; (2) query tap
- * to see if it supports the offload capabilities.
- */
- if (ioctl(tapfd, TUNSETOFFLOAD, offload) != 0)
- PMD_DRV_LOG(ERR, "TUNSETOFFLOAD ioctl() failed: %s",
- strerror(errno));
+ vhost_kernel_tap_set_offload(tapfd, features);
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
diff --git a/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
index 402f964..ea7a6c9 100644
--- a/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
+++ b/drivers/net/virtio/virtio_user/vhost_kernel_tap.h
@@ -65,4 +65,4 @@
#define PATH_NET_TUN "/dev/net/tun"
int vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
- const char *mac);
+ const char *mac, uint64_t features);
--
1.8.3.1
