diff options
Diffstat (limited to 'net/tap-linux.c')
| -rw-r--r-- | net/tap-linux.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/net/tap-linux.c b/net/tap-linux.c index 0a6acc7d5a..bdb0a790c8 100644 --- a/net/tap-linux.c +++ b/net/tap-linux.c @@ -41,6 +41,7 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required struct ifreq ifr; int fd, ret; int len = sizeof(struct virtio_net_hdr); + int mq_required = 0; TFR(fd = open(PATH_NET_TUN, O_RDWR)); if (fd < 0) { @@ -76,6 +77,20 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required ioctl(fd, TUNSETVNETHDRSZ, &len); } + if (mq_required) { + unsigned int features; + + if ((ioctl(fd, TUNGETFEATURES, &features) != 0) || + !(features & IFF_MULTI_QUEUE)) { + error_report("multiqueue required, but no kernel " + "support for IFF_MULTI_QUEUE available"); + close(fd); + return -1; + } else { + ifr.ifr_flags |= IFF_MULTI_QUEUE; + } + } + if (ifname[0] != '\0') pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname); else @@ -209,3 +224,40 @@ void tap_fd_set_offload(int fd, int csum, int tso4, } } } + +/* Enable a specific queue of tap. */ +int tap_fd_enable(int fd) +{ + struct ifreq ifr; + int ret; + + memset(&ifr, 0, sizeof(ifr)); + + ifr.ifr_flags = IFF_ATTACH_QUEUE; + ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr); + + if (ret != 0) { + error_report("could not enable queue"); + } + + return ret; +} + +/* Disable a specific queue of tap/ */ +int tap_fd_disable(int fd) +{ + struct ifreq ifr; + int ret; + + memset(&ifr, 0, sizeof(ifr)); + + ifr.ifr_flags = IFF_DETACH_QUEUE; + ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr); + + if (ret != 0) { + error_report("could not disable queue"); + } + + return ret; +} + |