From b49bc1ae6404f0dff373578786a9fd95d961e5cd Mon Sep 17 00:00:00 2001 From: Mohsin Kazmi Date: Fri, 14 Feb 2020 17:51:04 +0000 Subject: tap: add support for persistance Type: feature Change-Id: I775f53531972447ebae0d69b9e2dfeee84d115e5 Signed-off-by: Mohsin Kazmi --- src/vnet/devices/tap/FEATURE.yaml | 2 + src/vnet/devices/tap/cli.c | 7 +- src/vnet/devices/tap/tap.c | 137 ++++++++++++++++++++++++++++---------- src/vnet/devices/tap/tap.h | 2 + src/vnet/devices/tap/tapv2.api | 2 + src/vnet/devices/tap/tapv2_api.c | 2 - 6 files changed, 113 insertions(+), 39 deletions(-) (limited to 'src/vnet/devices/tap') diff --git a/src/vnet/devices/tap/FEATURE.yaml b/src/vnet/devices/tap/FEATURE.yaml index ce2c510cc9b..a143d333a48 100644 --- a/src/vnet/devices/tap/FEATURE.yaml +++ b/src/vnet/devices/tap/FEATURE.yaml @@ -3,6 +3,8 @@ name: Tap Device maintainer: damarion@cisco.com sluong@cisco.com sykazmi@cisco.com features: - Virtio + - persistence + - attach to existing tap at host description: "Create a tap v2 device interface, which connects to a tap interface on the host system." missing: diff --git a/src/vnet/devices/tap/cli.c b/src/vnet/devices/tap/cli.c index 8d59210c293..68b8cef2a21 100644 --- a/src/vnet/devices/tap/cli.c +++ b/src/vnet/devices/tap/cli.c @@ -92,6 +92,10 @@ tap_create_command_fn (vlib_main_t * vm, unformat_input_t * input, args.tap_flags |= TAP_FLAG_GSO; else if (unformat (line_input, "csum-offload")) args.tap_flags |= TAP_FLAG_CSUM_OFFLOAD; + else if (unformat (line_input, "persist")) + args.tap_flags |= TAP_FLAG_PERSIST; + else if (unformat (line_input, "attach")) + args.tap_flags |= TAP_FLAG_ATTACH; else if (unformat (line_input, "hw-addr %U", unformat_ethernet_address, args.mac_addr.bytes)) args.mac_addr_set = 1; @@ -131,7 +135,8 @@ VLIB_CLI_COMMAND (tap_create_command, static) = { "[host-bridge ] [host-ip4-addr ] " "[host-ip6-addr ] [host-ip4-gw ] " "[host-ip6-gw ] [host-mac-addr ] " - "[host-if-name ] [host-mtu-size ] [no-gso|gso|csum-offload]", + "[host-if-name ] [host-mtu-size ] [no-gso|gso|csum-offload] " + "[persist] [attach]", .function = tap_create_command_fn, }; /* *INDENT-ON* */ diff --git a/src/vnet/devices/tap/tap.c b/src/vnet/devices/tap/tap.c index 6f16a4cd71d..e17d01d88b1 100644 --- a/src/vnet/devices/tap/tap.c +++ b/src/vnet/devices/tap/tap.c @@ -91,6 +91,7 @@ tap_free (vlib_main_t * vm, virtio_if_t * vif) { virtio_main_t *mm = &virtio_main; tap_main_t *tm = &tap_main; + clib_error_t *err = 0; int i; /* *INDENT-OFF* */ @@ -102,6 +103,9 @@ tap_free (vlib_main_t * vm, virtio_if_t * vif) virtio_vring_free_tx (vm, vif, TX_QUEUE (i)); /* *INDENT-ON* */ + _IOCTL (vif->tap_fd, TUNSETPERSIST, (void *) (uintptr_t) 0); + tap_log_dbg (vif, "TUNSETPERSIST: unset"); +error: if (vif->tap_fd != -1) close (vif->tap_fd); @@ -131,6 +135,7 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args) int i; int old_netns_fd = -1; struct ifreq ifr = {.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR }; + struct ifreq get_ifr = {.ifr_flags = 0 }; size_t hdrsz; struct vhost_memory *vhost_mem = 0; virtio_if_t *vif = 0; @@ -170,6 +175,39 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args) vif->num_rxqs = args->num_rx_queues; num_q_pairs = clib_max (vif->num_rxqs, vif->num_txqs); + if (args->tap_flags & TAP_FLAG_ATTACH) + { + if (args->host_if_name != NULL) + { + host_if_name = (char *) args->host_if_name; + clib_memcpy (ifr.ifr_name, host_if_name, + clib_min (IFNAMSIZ, strlen (host_if_name))); + } + else + { + args->rv = VNET_API_ERROR_NO_MATCHING_INTERFACE; + err = clib_error_return (0, "host_if_name is not provided"); + goto error; + } + if (args->host_namespace) + { + old_netns_fd = open ("/proc/self/ns/net", O_RDONLY); + if ((nfd = open_netns_fd ((char *) args->host_namespace)) == -1) + { + args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; + args->error = clib_error_return_unix (0, "open_netns_fd '%s'", + args->host_namespace); + goto error; + } + if (setns (nfd, CLONE_NEWNET) == -1) + { + args->rv = VNET_API_ERROR_SYSCALL_ERROR_3; + args->error = clib_error_return_unix (0, "setns '%s'", + args->host_namespace); + goto error; + } + } + } if ((vif->tap_fd = tfd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; @@ -231,6 +269,33 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args) goto error; } + /* + * unset the persistence when attaching to existing + * interface + */ + if (args->tap_flags & TAP_FLAG_ATTACH) + { + _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 0); + tap_log_dbg (vif, "TUNSETPERSIST: unset"); + } + + /* set the persistence */ + if (args->tap_flags & TAP_FLAG_PERSIST) + { + _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 1); + tap_log_dbg (vif, "TUNSETPERSIST: set"); + + /* verify persistence is set, read the flags */ + _IOCTL (tfd, TUNGETIFF, (void *) &get_ifr); + tap_log_dbg (vif, "TUNGETIFF: flags 0x%lx", get_ifr.ifr_flags); + if ((get_ifr.ifr_flags & IFF_PERSIST) == 0) + { + args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; + args->error = clib_error_return (0, "persistence not supported"); + goto error; + } + } + tap_log_dbg (vif, "TUNSETVNETHDRSZ: fd %d vnet_hdr_sz %u", tfd, hdrsz); _IOCTL (tfd, TUNSETVNETHDRSZ, &hdrsz); @@ -291,46 +356,46 @@ tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args) virtio_set_net_hdr_size (vif); - /* if namespace is specified, all further netlink messages should be executed - after we change our net namespace */ - if (args->host_namespace) + if (!(args->tap_flags & TAP_FLAG_ATTACH)) { - old_netns_fd = open ("/proc/self/ns/net", O_RDONLY); - if ((nfd = open_netns_fd ((char *) args->host_namespace)) == -1) + /* if namespace is specified, all further netlink messages should be executed + after we change our net namespace */ + if (args->host_namespace) { - args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; - args->error = clib_error_return_unix (0, "open_netns_fd '%s'", - args->host_namespace); - goto error; - } - args->error = vnet_netlink_set_link_netns (vif->ifindex, nfd, - host_if_name); - if (args->error) - { - args->rv = VNET_API_ERROR_NETLINK_ERROR; - goto error; - } - if (setns (nfd, CLONE_NEWNET) == -1) - { - args->rv = VNET_API_ERROR_SYSCALL_ERROR_3; - args->error = clib_error_return_unix (0, "setns '%s'", - args->host_namespace); - goto error; - } - if ((vif->ifindex = if_nametoindex (host_if_name)) == 0) - { - args->rv = VNET_API_ERROR_SYSCALL_ERROR_3; - args->error = clib_error_return_unix (0, "if_nametoindex '%s'", - host_if_name); - goto error; + old_netns_fd = open ("/proc/self/ns/net", O_RDONLY); + if ((nfd = open_netns_fd ((char *) args->host_namespace)) == -1) + { + args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; + args->error = clib_error_return_unix (0, "open_netns_fd '%s'", + args->host_namespace); + goto error; + } + args->error = vnet_netlink_set_link_netns (vif->ifindex, nfd, + host_if_name); + if (args->error) + { + args->rv = VNET_API_ERROR_NETLINK_ERROR; + goto error; + } + if (setns (nfd, CLONE_NEWNET) == -1) + { + args->rv = VNET_API_ERROR_SYSCALL_ERROR_3; + args->error = clib_error_return_unix (0, "setns '%s'", + args->host_namespace); + goto error; + } + if ((vif->ifindex = if_nametoindex (host_if_name)) == 0) + { + args->rv = VNET_API_ERROR_SYSCALL_ERROR_3; + args->error = clib_error_return_unix (0, "if_nametoindex '%s'", + host_if_name); + goto error; + } } - } - else - { - if (host_if_name) + else if (host_if_name) { - args->error = vnet_netlink_set_link_name (vif->ifindex, - host_if_name); + args->error = + vnet_netlink_set_link_name (vif->ifindex, host_if_name); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; diff --git a/src/vnet/devices/tap/tap.h b/src/vnet/devices/tap/tap.h index fd4006b5d52..5d087ad9da5 100644 --- a/src/vnet/devices/tap/tap.h +++ b/src/vnet/devices/tap/tap.h @@ -33,6 +33,8 @@ typedef struct u32 tap_flags; #define TAP_FLAG_GSO (1 << 0) #define TAP_FLAG_CSUM_OFFLOAD (1 << 1) +#define TAP_FLAG_PERSIST (1 << 2) +#define TAP_FLAG_ATTACH (1 << 3) u8 *host_namespace; u8 *host_if_name; mac_address_t host_mac_addr; diff --git a/src/vnet/devices/tap/tapv2.api b/src/vnet/devices/tap/tapv2.api index 861fe170959..ccbbe158160 100644 --- a/src/vnet/devices/tap/tapv2.api +++ b/src/vnet/devices/tap/tapv2.api @@ -28,6 +28,8 @@ import "vnet/ip/ip_types.api"; enum tap_flags { TAP_FLAG_GSO = 1, TAP_FLAG_CSUM_OFFLOAD = 2, + TAP_FLAG_PERSIST = 4, + TAP_FLAG_ATTACH = 8, }; /** \brief Initialize a new tap interface with the given parameters diff --git a/src/vnet/devices/tap/tapv2_api.c b/src/vnet/devices/tap/tapv2_api.c index 3b66bf0d6ec..9e09459c9ab 100644 --- a/src/vnet/devices/tap/tapv2_api.c +++ b/src/vnet/devices/tap/tapv2_api.c @@ -164,8 +164,6 @@ vl_api_tap_delete_v2_t_handler (vl_api_tap_delete_v2_t * mp) rv = tap_delete_if (vm, sw_if_index); - - rmp = vl_msg_api_alloc (sizeof (*rmp)); rmp->_vl_msg_id = ntohs (VL_API_TAP_DELETE_V2_REPLY); rmp->context = mp->context; -- cgit 1.2.3-korg