[ovs-dev] [PATCH 1/2] dpif-linux: Implement the API functions to allow multiple handler threads read upcall.
Ethan Jackson
ethan at nicira.com
Thu Apr 17 22:50:54 UTC 2014
I don't like that dpif_linux_run() has to take the write lock every
time it's called. Maybe you could make the dpif->refresh_channels
variable atomic, check it, and only take the lock if it's true?
I think a lot of these functions could use annotations saying whether
they require a read/write lock from the upcall lock.
Otherwise looks fine to me.
Ethan
On Tue, Apr 15, 2014 at 1:23 PM, Alex Wang <alexw at nicira.com> wrote:
> Signed-off-by: Alex Wang <alexw at nicira.com>
>
> ---
> V7 -> V8:
> - rebase.
>
> V6 -> V7:
> - rebase.
> - set n_handlers to 0 in destroy_all_channels().
> - fix the indexing error in dpif_linux_recv_purge().
>
> V5 -> V6:
> - move the 'struct dpif_epoll' in 'struct dpif_handler'
> - fix typos based on review.
> - refine refresh_channels() comments.
> - rename 'n_pids' of 'struct dpif_linux_vport' to 'n_upcall_pids'.
>
> V4 -> V5:
> - rebase.
>
> V3 -> V4:
> - add check of handler_id range.
>
> V2 -> V3:
> - use OVS_DP_ATTR_USER_FEATURES to inform datapath about the type of
> OVS_VPORT_ATTR_UPCALL_PID attribute.
> - close epoll fd when destroying all channels.
>
> PATCH -> V2:
> - rebase.
>
> major changes since RFC:
> - free the 'upcall_pids' pointer in dpif_linux_refresh_channels().
> - for cache access efficiency, in 'recv()' index the handlers
> array first and then port channels array.
> ---
> lib/dpif-linux.c | 549 +++++++++++++++++++++++++++++++++++-------------------
> lib/dpif-linux.h | 3 +-
> 2 files changed, 361 insertions(+), 191 deletions(-)
>
> diff --git a/lib/dpif-linux.c b/lib/dpif-linux.c
> index e8efdac..87f180e 100644
> --- a/lib/dpif-linux.c
> +++ b/lib/dpif-linux.c
> @@ -36,6 +36,7 @@
> #include "dpif-provider.h"
> #include "dynamic-string.h"
> #include "flow.h"
> +#include "fat-rwlock.h"
> #include "netdev.h"
> #include "netdev-linux.h"
> #include "netdev-vport.h"
> @@ -132,7 +133,13 @@ struct dpif_channel {
> long long int last_poll; /* Last time this channel was polled. */
> };
>
> -static void report_loss(struct dpif *, struct dpif_channel *);
> +struct dpif_handler {
> + struct dpif_channel *channels;/* Array of channels for each handler. */
> + struct epoll_event *epoll_events;
> + int epoll_fd; /* epoll fd that includes channel socks. */
> + int n_events; /* Num events returned by epoll_wait(). */
> + int event_offset; /* Offset into 'epoll_events'. */
> +};
>
> /* Datapath interface for the openvswitch Linux kernel module. */
> struct dpif_linux {
> @@ -140,19 +147,20 @@ struct dpif_linux {
> int dp_ifindex;
>
> /* Upcall messages. */
> - struct ovs_mutex upcall_lock;
> - int uc_array_size; /* Size of 'channels' and 'epoll_events'. */
> - struct dpif_channel *channels;
> - struct epoll_event *epoll_events;
> - int epoll_fd; /* epoll fd that includes channel socks. */
> - int n_events; /* Num events returned by epoll_wait(). */
> - int event_offset; /* Offset into 'epoll_events'. */
> + struct fat_rwlock upcall_lock;
> + struct dpif_handler *handlers;
> + uint32_t n_handlers; /* Num of upcall handlers. */
> + int uc_array_size; /* Size of 'handler->channels' and */
> + /* 'handler->epoll_events'. */
>
> /* Change notification. */
> struct nl_sock *port_notifier; /* vport multicast group subscriber. */
> bool refresh_channels;
> };
>
> +static void report_loss(struct dpif *, struct dpif_channel *, uint32_t ch_idx,
> + uint32_t handler_id);
> +
> static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
>
> /* Generic Netlink family numbers for OVS.
> @@ -172,8 +180,7 @@ static int dpif_linux_init(void);
> static int open_dpif(const struct dpif_linux_dp *, struct dpif **);
> static uint32_t dpif_linux_port_get_pid(const struct dpif *,
> odp_port_t port_no, uint32_t hash);
> -static int dpif_linux_refresh_channels(struct dpif *);
> -
> +static int dpif_linux_refresh_channels(struct dpif *, uint32_t n_handlers);
> static void dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *,
> struct ofpbuf *);
> static int dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *,
> @@ -238,6 +245,7 @@ dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
> }
> dp_request.name = name;
> dp_request.user_features |= OVS_DP_F_UNALIGNED;
> + dp_request.user_features |= OVS_DP_F_VPORT_PIDS;
> error = dpif_linux_dp_transact(&dp_request, &dp, &buf);
> if (error) {
> return error;
> @@ -255,8 +263,7 @@ open_dpif(const struct dpif_linux_dp *dp, struct dpif **dpifp)
>
> dpif = xzalloc(sizeof *dpif);
> dpif->port_notifier = NULL;
> - ovs_mutex_init(&dpif->upcall_lock);
> - dpif->epoll_fd = -1;
> + fat_rwlock_init(&dpif->upcall_lock);
>
> dpif_init(&dpif->dpif, &dpif_linux_class, dp->name,
> dp->dp_ifindex, dp->dp_ifindex);
> @@ -267,64 +274,110 @@ open_dpif(const struct dpif_linux_dp *dp, struct dpif **dpifp)
> return 0;
> }
>
> +/* Destroys the netlink sockets pointed by the elements in 'socksp'
> + * and frees the 'socksp'. */
> static void
> -destroy_channels(struct dpif_linux *dpif)
> +vport_del_socksp(struct nl_sock **socksp, uint32_t n_socks)
> {
> - unsigned int i;
> + size_t i;
>
> - if (dpif->epoll_fd < 0) {
> - return;
> + for (i = 0; i < n_socks; i++) {
> + nl_sock_destroy(socksp[i]);
> }
>
> - for (i = 0; i < dpif->uc_array_size; i++ ) {
> - struct dpif_linux_vport vport_request;
> - struct dpif_channel *ch = &dpif->channels[i];
> - uint32_t upcall_pid = 0;
> + free(socksp);
> +}
>
> - if (!ch->sock) {
> - continue;
> +/* Creates an array of netlink sockets. Returns an array of the
> + * corresponding pointers. Records the error in 'error'. */
> +static struct nl_sock **
> +vport_create_socksp(uint32_t n_socks, int *error)
> +{
> + struct nl_sock **socksp = xzalloc(n_socks * sizeof *socksp);
> + size_t i;
> +
> + for (i = 0; i < n_socks; i++) {
> + *error = nl_sock_create(NETLINK_GENERIC, &socksp[i]);
> + if (*error) {
> + goto error;
> }
> + }
>
> - epoll_ctl(dpif->epoll_fd, EPOLL_CTL_DEL, nl_sock_fd(ch->sock), NULL);
> + return socksp;
>
> - /* Turn off upcalls. */
> - dpif_linux_vport_init(&vport_request);
> - vport_request.cmd = OVS_VPORT_CMD_SET;
> - vport_request.dp_ifindex = dpif->dp_ifindex;
> - vport_request.port_no = u32_to_odp(i);
> - vport_request.upcall_pid = &upcall_pid;
> - dpif_linux_vport_transact(&vport_request, NULL, NULL);
> +error:
> + vport_del_socksp(socksp, n_socks);
>
> - nl_sock_destroy(ch->sock);
> + return NULL;
> +}
> +
> +/* Given the array of pointers to netlink sockets 'socksp', returns
> + * the array of corresponding pids. If the 'socksp' is NULL, returns
> + * a single-element array of value 0. */
> +static uint32_t *
> +vport_socksp_to_pids(struct nl_sock **socksp, uint32_t n_socks)
> +{
> + uint32_t *pids;
> +
> + if (!socksp) {
> + pids = xzalloc(sizeof *pids);
> + } else {
> + size_t i;
> +
> + pids = xzalloc(n_socks * sizeof *pids);
> + for (i = 0; i < n_socks; i++) {
> + pids[i] = nl_sock_pid(socksp[i]);
> + }
> }
>
> - free(dpif->channels);
> - dpif->channels = NULL;
> - dpif->uc_array_size = 0;
> + return pids;
> +}
> +
> +/* Given the port number 'port_idx', extracts the pids of netlink sockets
> + * associated to the port and assigns it to 'upcall_pids'. */
> +static bool
> +vport_get_pids(struct dpif_linux *dpif, uint32_t port_idx,
> + uint32_t **upcall_pids)
> +{
> + uint32_t *pids;
> + size_t i;
>
> - free(dpif->epoll_events);
> - dpif->epoll_events = NULL;
> - dpif->n_events = dpif->event_offset = 0;
> + /* Since the nl_sock can only be assigned in either all
> + * or none "dpif->handlers" channels, the following check
> + * would suffice. */
> + if (!dpif->handlers[0].channels[port_idx].sock) {
> + return false;
> + }
> +
> + pids = xzalloc(dpif->n_handlers * sizeof *pids);
> +
> + for (i = 0; i < dpif->n_handlers; i++) {
> + pids[i] = nl_sock_pid(dpif->handlers[i].channels[port_idx].sock);
> + }
> +
> + *upcall_pids = pids;
>
> - /* Don't close dpif->epoll_fd since that would cause other threads that
> - * call dpif_recv_wait() to wait on an arbitrary fd or a closed fd. */
> + return true;
> }
>
> static int
> -add_channel(struct dpif_linux *dpif, odp_port_t port_no, struct nl_sock *sock)
> +vport_add_channels(struct dpif_linux *dpif, odp_port_t port_no,
> + struct nl_sock **socksp)
> {
> struct epoll_event event;
> uint32_t port_idx = odp_to_u32(port_no);
> + size_t i, j;
> + int error;
>
> - if (dpif->epoll_fd < 0) {
> + if (dpif->handlers == NULL) {
> return 0;
> }
>
> - /* We assume that the datapath densely chooses port numbers, which
> - * can therefore be used as an index into an array of channels. */
> + /* We assume that the datapath densely chooses port numbers, which can
> + * therefore be used as an index into 'channels' and 'epoll_events' of
> + * 'dpif->handler'. */
> if (port_idx >= dpif->uc_array_size) {
> uint32_t new_size = port_idx + 1;
> - uint32_t i;
>
> if (new_size > MAX_PORTS) {
> VLOG_WARN_RL(&error_rl, "%s: datapath port %"PRIu32" too big",
> @@ -332,52 +385,122 @@ add_channel(struct dpif_linux *dpif, odp_port_t port_no, struct nl_sock *sock)
> return EFBIG;
> }
>
> - dpif->channels = xrealloc(dpif->channels,
> - new_size * sizeof *dpif->channels);
> - for (i = dpif->uc_array_size; i < new_size; i++) {
> - dpif->channels[i].sock = NULL;
> - }
> + for (i = 0; i < dpif->n_handlers; i++) {
> + struct dpif_handler *handler = &dpif->handlers[i];
> +
> + handler->channels = xrealloc(handler->channels,
> + new_size * sizeof *handler->channels);
> +
> + for (j = dpif->uc_array_size; j < new_size; j++) {
> + handler->channels[j].sock = NULL;
> + }
> +
> + handler->epoll_events = xrealloc(handler->epoll_events,
> + new_size * sizeof *handler->epoll_events);
>
> - dpif->epoll_events = xrealloc(dpif->epoll_events,
> - new_size * sizeof *dpif->epoll_events);
> + }
> dpif->uc_array_size = new_size;
> }
>
> memset(&event, 0, sizeof event);
> event.events = EPOLLIN;
> event.data.u32 = port_idx;
> - if (epoll_ctl(dpif->epoll_fd, EPOLL_CTL_ADD, nl_sock_fd(sock),
> - &event) < 0) {
> - return errno;
> - }
>
> - nl_sock_destroy(dpif->channels[port_idx].sock);
> - dpif->channels[port_idx].sock = sock;
> - dpif->channels[port_idx].last_poll = LLONG_MIN;
> + for (i = 0; i < dpif->n_handlers; i++) {
> + struct dpif_handler *handler = &dpif->handlers[i];
> +
> + if (epoll_ctl(handler->epoll_fd, EPOLL_CTL_ADD, nl_sock_fd(socksp[i]),
> + &event) < 0) {
> + error = errno;
> + goto error;
> + }
> + dpif->handlers[i].channels[port_idx].sock = socksp[i];
> + dpif->handlers[i].channels[port_idx].last_poll = LLONG_MIN;
> + }
>
> return 0;
> +
> +error:
> + for (j = 0; j < i; j++) {
> + epoll_ctl(dpif->handlers[j].epoll_fd, EPOLL_CTL_DEL,
> + nl_sock_fd(socksp[j]), NULL);
> + dpif->handlers[j].channels[port_idx].sock = NULL;
> + }
> +
> + return error;
> }
>
> static void
> -del_channel(struct dpif_linux *dpif, odp_port_t port_no)
> +vport_del_channels(struct dpif_linux *dpif, odp_port_t port_no)
> {
> - struct dpif_channel *ch;
> uint32_t port_idx = odp_to_u32(port_no);
> + size_t i;
>
> - if (dpif->epoll_fd < 0 || port_idx >= dpif->uc_array_size) {
> + if (!dpif->handlers || port_idx >= dpif->uc_array_size) {
> return;
> }
>
> - ch = &dpif->channels[port_idx];
> - if (!ch->sock) {
> + /* Since the sock can only be assigned in either all or none
> + * of "dpif->handlers" channels, the following check would
> + * suffice. */
> + if (!dpif->handlers[0].channels[port_idx].sock) {
> return;
> }
>
> - epoll_ctl(dpif->epoll_fd, EPOLL_CTL_DEL, nl_sock_fd(ch->sock), NULL);
> - dpif->event_offset = dpif->n_events = 0;
> + for (i = 0; i < dpif->n_handlers; i++) {
> + struct dpif_handler *handler = &dpif->handlers[i];
> +
> + epoll_ctl(handler->epoll_fd, EPOLL_CTL_DEL,
> + nl_sock_fd(handler->channels[port_idx].sock), NULL);
> + nl_sock_destroy(handler->channels[port_idx].sock);
> + handler->channels[port_idx].sock = NULL;
> + handler->event_offset = handler->n_events = 0;
> + }
> +}
> +
> +static void
> +destroy_all_channels(struct dpif_linux *dpif)
> +{
> + unsigned int i;
> +
> + if (!dpif->handlers) {
> + return;
> + }
> +
> + for (i = 0; i < dpif->uc_array_size; i++ ) {
> + struct dpif_linux_vport vport_request;
> + uint32_t upcall_pids = 0;
> +
> + /* Since the sock can only be assigned in either all or none
> + * of "dpif->handlers" channels, the following check would
> + * suffice. */
> + if (!dpif->handlers[0].channels[i].sock) {
> + continue;
> + }
> +
> + /* Turn off upcalls. */
> + dpif_linux_vport_init(&vport_request);
> + vport_request.cmd = OVS_VPORT_CMD_SET;
> + vport_request.dp_ifindex = dpif->dp_ifindex;
> + vport_request.port_no = u32_to_odp(i);
> + vport_request.upcall_pids = &upcall_pids;
> + dpif_linux_vport_transact(&vport_request, NULL, NULL);
> +
> + vport_del_channels(dpif, u32_to_odp(i));
> + }
> +
> + for (i = 0; i < dpif->n_handlers; i++) {
> + struct dpif_handler *handler = &dpif->handlers[i];
> +
> + close(handler->epoll_fd);
> + free(handler->epoll_events);
> + free(handler->channels);
> + }
>
> - nl_sock_destroy(ch->sock);
> - ch->sock = NULL;
> + free(dpif->handlers);
> + dpif->handlers = NULL;
> + dpif->n_handlers = 0;
> + dpif->uc_array_size = 0;
> }
>
> static void
> @@ -386,11 +509,12 @@ dpif_linux_close(struct dpif *dpif_)
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
>
> nl_sock_destroy(dpif->port_notifier);
> - destroy_channels(dpif);
> - if (dpif->epoll_fd >= 0) {
> - close(dpif->epoll_fd);
> - }
> - ovs_mutex_destroy(&dpif->upcall_lock);
> +
> + fat_rwlock_wrlock(&dpif->upcall_lock);
> + destroy_all_channels(dpif);
> + fat_rwlock_unlock(&dpif->upcall_lock);
> +
> + fat_rwlock_destroy(&dpif->upcall_lock);
> free(dpif);
> }
>
> @@ -410,10 +534,13 @@ static void
> dpif_linux_run(struct dpif *dpif_)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> +
> + fat_rwlock_wrlock(&dpif->upcall_lock);
> if (dpif->refresh_channels) {
> dpif->refresh_channels = false;
> - dpif_linux_refresh_channels(dpif_);
> + dpif_linux_refresh_channels(dpif_, dpif->n_handlers);
> }
> + fat_rwlock_unlock(&dpif->upcall_lock);
> }
>
> static int
> @@ -506,16 +633,16 @@ dpif_linux_port_add__(struct dpif *dpif_, struct netdev *netdev,
> namebuf, sizeof namebuf);
> const char *type = netdev_get_type(netdev);
> struct dpif_linux_vport request, reply;
> - struct nl_sock *sock = NULL;
> - uint32_t upcall_pid;
> struct ofpbuf *buf;
> uint64_t options_stub[64 / 8];
> struct ofpbuf options;
> - int error;
> + struct nl_sock **socksp = NULL;
> + uint32_t *upcall_pids;
> + int error = 0;
>
> - if (dpif->epoll_fd >= 0) {
> - error = nl_sock_create(NETLINK_GENERIC, &sock);
> - if (error) {
> + if (dpif->handlers) {
> + socksp = vport_create_socksp(dpif->n_handlers, &error);
> + if (!socksp) {
> return error;
> }
> }
> @@ -528,7 +655,7 @@ dpif_linux_port_add__(struct dpif *dpif_, struct netdev *netdev,
> VLOG_WARN_RL(&error_rl, "%s: cannot create port `%s' because it has "
> "unsupported type `%s'",
> dpif_name(dpif_), name, type);
> - nl_sock_destroy(sock);
> + vport_del_socksp(socksp, dpif->n_handlers);
> return EINVAL;
> }
> request.name = name;
> @@ -547,27 +674,25 @@ dpif_linux_port_add__(struct dpif *dpif_, struct netdev *netdev,
> }
>
> request.port_no = *port_nop;
> - upcall_pid = sock ? nl_sock_pid(sock) : 0;
> - request.upcall_pid = &upcall_pid;
> + upcall_pids = vport_socksp_to_pids(socksp, dpif->n_handlers);
> + request.n_upcall_pids = dpif->n_handlers;
> + request.upcall_pids = upcall_pids;
>
> error = dpif_linux_vport_transact(&request, &reply, &buf);
> if (!error) {
> *port_nop = reply.port_no;
> - VLOG_DBG("%s: assigning port %"PRIu32" to netlink pid %"PRIu32,
> - dpif_name(dpif_), reply.port_no, upcall_pid);
> } else {
> if (error == EBUSY && *port_nop != ODPP_NONE) {
> VLOG_INFO("%s: requested port %"PRIu32" is in use",
> dpif_name(dpif_), *port_nop);
> }
> - nl_sock_destroy(sock);
> - ofpbuf_delete(buf);
> - return error;
> +
> + vport_del_socksp(socksp, dpif->n_handlers);
> + goto exit;
> }
> - ofpbuf_delete(buf);
>
> - if (sock) {
> - error = add_channel(dpif, *port_nop, sock);
> + if (socksp) {
> + error = vport_add_channels(dpif, *port_nop, socksp);
> if (error) {
> VLOG_INFO("%s: could not add channel for port %s",
> dpif_name(dpif_), name);
> @@ -578,13 +703,17 @@ dpif_linux_port_add__(struct dpif *dpif_, struct netdev *netdev,
> request.dp_ifindex = dpif->dp_ifindex;
> request.port_no = *port_nop;
> dpif_linux_vport_transact(&request, NULL, NULL);
> -
> - nl_sock_destroy(sock);
> - return error;
> + vport_del_socksp(socksp, dpif->n_handlers);
> + goto exit;
> }
> }
> + free(socksp);
>
> - return 0;
> +exit:
> + ofpbuf_delete(buf);
> + free(upcall_pids);
> +
> + return error;
> }
>
> static int
> @@ -594,9 +723,9 @@ dpif_linux_port_add(struct dpif *dpif_, struct netdev *netdev,
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> int error;
>
> - ovs_mutex_lock(&dpif->upcall_lock);
> + fat_rwlock_wrlock(&dpif->upcall_lock);
> error = dpif_linux_port_add__(dpif_, netdev, port_nop);
> - ovs_mutex_unlock(&dpif->upcall_lock);
> + fat_rwlock_unlock(&dpif->upcall_lock);
>
> return error;
> }
> @@ -614,7 +743,7 @@ dpif_linux_port_del__(struct dpif *dpif_, odp_port_t port_no)
> vport.port_no = port_no;
> error = dpif_linux_vport_transact(&vport, NULL, NULL);
>
> - del_channel(dpif, port_no);
> + vport_del_channels(dpif, port_no);
>
> return error;
> }
> @@ -625,9 +754,9 @@ dpif_linux_port_del(struct dpif *dpif_, odp_port_t port_no)
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> int error;
>
> - ovs_mutex_lock(&dpif->upcall_lock);
> + fat_rwlock_wrlock(&dpif->upcall_lock);
> error = dpif_linux_port_del__(dpif_, port_no);
> - ovs_mutex_unlock(&dpif->upcall_lock);
> + fat_rwlock_unlock(&dpif->upcall_lock);
>
> return error;
> }
> @@ -679,21 +808,22 @@ dpif_linux_port_query_by_name(const struct dpif *dpif, const char *devname,
>
> static uint32_t
> dpif_linux_port_get_pid(const struct dpif *dpif_, odp_port_t port_no,
> - uint32_t hash OVS_UNUSED)
> + uint32_t hash)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> uint32_t port_idx = odp_to_u32(port_no);
> uint32_t pid = 0;
>
> - ovs_mutex_lock(&dpif->upcall_lock);
> - if (dpif->epoll_fd >= 0) {
> + fat_rwlock_rdlock(&dpif->upcall_lock);
> + if (dpif->handlers) {
> /* The ODPP_NONE "reserved" port number uses the "ovs-system"'s
> * channel, since it is not heavily loaded. */
> uint32_t idx = port_idx >= dpif->uc_array_size ? 0 : port_idx;
> - const struct nl_sock *sock = dpif->channels[idx].sock;
> - pid = sock ? nl_sock_pid(sock) : 0;
> + struct dpif_handler *h = &dpif->handlers[hash % dpif->n_handlers];
> +
> + pid = nl_sock_pid(h->channels[idx].sock);
> }
> - ovs_mutex_unlock(&dpif->upcall_lock);
> + fat_rwlock_unlock(&dpif->upcall_lock);
>
> return pid;
> }
> @@ -841,7 +971,7 @@ dpif_linux_port_poll(const struct dpif *dpif_, char **devnamep)
> || vport.cmd == OVS_VPORT_CMD_SET)) {
> VLOG_DBG("port_changed: dpif:%s vport:%s cmd:%"PRIu8,
> dpif->dpif.full_name, vport.name, vport.cmd);
> - if (vport.cmd == OVS_VPORT_CMD_DEL) {
> + if (vport.cmd == OVS_VPORT_CMD_DEL && dpif->handlers) {
> dpif->refresh_channels = true;
> }
> *devnamep = xstrdup(vport.name);
> @@ -1322,11 +1452,12 @@ dpif_linux_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops)
> }
> }
>
> -/* Synchronizes 'dpif->channels' with the set of vports currently in 'dpif' in
> - * the kernel, by adding a new channel for any kernel vport that lacks one and
> - * deleting any channels that have no backing kernel vports. */
> +/* Synchronizes 'channels' in 'dpif->handlers' with the set of vports
> + * currently in 'dpif' in the kernel, by adding a new set of channels for
> + * any kernel vport that lacks one and deleting any channels that have no
> + * backing kernel vports. */
> static int
> -dpif_linux_refresh_channels(struct dpif *dpif_)
> +dpif_linux_refresh_channels(struct dpif *dpif_, uint32_t n_handlers)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> unsigned long int *keep_channels;
> @@ -1338,53 +1469,80 @@ dpif_linux_refresh_channels(struct dpif *dpif_)
> int retval = 0;
> size_t i;
>
> - /* To start with, we need an epoll fd. */
> - if (dpif->epoll_fd < 0) {
> - dpif->epoll_fd = epoll_create(10);
> - if (dpif->epoll_fd < 0) {
> - return errno;
> + if (dpif->n_handlers != n_handlers) {
> + destroy_all_channels(dpif);
> + dpif->handlers = xzalloc(n_handlers * sizeof *dpif->handlers);
> + for (i = 0; i < n_handlers; i++) {
> + struct dpif_handler *handler = &dpif->handlers[i];
> +
> + handler->epoll_fd = epoll_create(10);
> + if (handler->epoll_fd < 0) {
> + size_t j;
> +
> + for (j = 0; j < i; j++) {
> + close(dpif->handlers[j].epoll_fd);
> + }
> + free(dpif->handlers);
> + dpif->handlers = NULL;
> +
> + return errno;
> + }
> }
> + dpif->n_handlers = n_handlers;
> + }
> +
> + for (i = 0; i < n_handlers; i++) {
> + struct dpif_handler *handler = &dpif->handlers[i];
> +
> + handler->event_offset = handler->n_events = 0;
> }
>
> keep_channels_nbits = dpif->uc_array_size;
> keep_channels = bitmap_allocate(keep_channels_nbits);
>
> - dpif->n_events = dpif->event_offset = 0;
> -
> ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub);
> dpif_linux_port_dump_start__(dpif_, &dump);
> while (!dpif_linux_port_dump_next__(dpif_, &dump, &vport, &buf)) {
> uint32_t port_no = odp_to_u32(vport.port_no);
> - struct nl_sock *sock = (port_no < dpif->uc_array_size
> - ? dpif->channels[port_no].sock
> - : NULL);
> - bool new_sock = !sock;
> + uint32_t *upcall_pids = NULL;
> int error;
>
> - if (new_sock) {
> - error = nl_sock_create(NETLINK_GENERIC, &sock);
> + if (port_no >= dpif->uc_array_size
> + || !vport_get_pids(dpif, port_no, &upcall_pids)) {
> + struct nl_sock **socksp = vport_create_socksp(dpif->n_handlers,
> + &error);
> +
> + if (!socksp) {
> + goto error;
> + }
> +
> + error = vport_add_channels(dpif, vport.port_no, socksp);
> if (error) {
> + VLOG_INFO("%s: could not add channels for port %s",
> + dpif_name(dpif_), vport.name);
> + vport_del_socksp(socksp, dpif->n_handlers);
> retval = error;
> goto error;
> }
> + upcall_pids = vport_socksp_to_pids(socksp, dpif->n_handlers);
> + free(socksp);
> }
>
> /* Configure the vport to deliver misses to 'sock'. */
> - if (!vport.upcall_pid || *vport.upcall_pid != nl_sock_pid(sock)) {
> - uint32_t upcall_pid = nl_sock_pid(sock);
> + if (vport.upcall_pids[0] == 0
> + || vport.n_upcall_pids != dpif->n_handlers
> + || memcmp(upcall_pids, vport.upcall_pids, n_handlers * sizeof
> + *upcall_pids)) {
> struct dpif_linux_vport vport_request;
>
> dpif_linux_vport_init(&vport_request);
> vport_request.cmd = OVS_VPORT_CMD_SET;
> vport_request.dp_ifindex = dpif->dp_ifindex;
> vport_request.port_no = vport.port_no;
> - vport_request.upcall_pid = &upcall_pid;
> + vport_request.n_upcall_pids = dpif->n_handlers;
> + vport_request.upcall_pids = upcall_pids;
> error = dpif_linux_vport_transact(&vport_request, NULL, NULL);
> - if (!error) {
> - VLOG_DBG("%s: assigning port %"PRIu32" to netlink pid %"PRIu32,
> - dpif_name(&dpif->dpif), vport_request.port_no,
> - upcall_pid);
> - } else {
> + if (error) {
> VLOG_WARN_RL(&error_rl,
> "%s: failed to set upcall pid on port: %s",
> dpif_name(&dpif->dpif), ovs_strerror(error));
> @@ -1400,23 +1558,15 @@ dpif_linux_refresh_channels(struct dpif *dpif_)
> }
> }
>
> - if (new_sock) {
> - error = add_channel(dpif, vport.port_no, sock);
> - if (error) {
> - VLOG_INFO("%s: could not add channel for port %s",
> - dpif_name(dpif_), vport.name);
> - retval = error;
> - goto error;
> - }
> - }
> -
> if (port_no < keep_channels_nbits) {
> bitmap_set1(keep_channels, port_no);
> }
> + free(upcall_pids);
> continue;
>
> error:
> - nl_sock_destroy(sock);
> + free(upcall_pids);
> + vport_del_channels(dpif, vport.port_no);
> }
> nl_dump_done(&dump);
> ofpbuf_uninit(&buf);
> @@ -1424,8 +1574,7 @@ dpif_linux_refresh_channels(struct dpif *dpif_)
> /* Discard any saved channels that we didn't reuse. */
> for (i = 0; i < keep_channels_nbits; i++) {
> if (!bitmap_is_set(keep_channels, i)) {
> - nl_sock_destroy(dpif->channels[i].sock);
> - dpif->channels[i].sock = NULL;
> + vport_del_channels(dpif, u32_to_odp(i));
> }
> }
> free(keep_channels);
> @@ -1438,13 +1587,13 @@ dpif_linux_recv_set__(struct dpif *dpif_, bool enable)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
>
> - if ((dpif->epoll_fd >= 0) == enable) {
> + if ((dpif->handlers != NULL) == enable) {
> return 0;
> } else if (!enable) {
> - destroy_channels(dpif);
> + destroy_all_channels(dpif);
> return 0;
> } else {
> - return dpif_linux_refresh_channels(dpif_);
> + return dpif_linux_refresh_channels(dpif_, 1);
> }
> }
>
> @@ -1454,18 +1603,26 @@ dpif_linux_recv_set(struct dpif *dpif_, bool enable)
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> int error;
>
> - ovs_mutex_lock(&dpif->upcall_lock);
> + fat_rwlock_wrlock(&dpif->upcall_lock);
> error = dpif_linux_recv_set__(dpif_, enable);
> - ovs_mutex_unlock(&dpif->upcall_lock);
> + fat_rwlock_unlock(&dpif->upcall_lock);
>
> return error;
> }
>
> static int
> -dpif_linux_handlers_set(struct dpif *dpif_ OVS_UNUSED,
> - uint32_t n_handlers OVS_UNUSED)
> +dpif_linux_handlers_set(struct dpif *dpif_, uint32_t n_handlers)
> {
> - return 0;
> + struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> + int error = 0;
> +
> + fat_rwlock_wrlock(&dpif->upcall_lock);
> + if (dpif->handlers) {
> + error = dpif_linux_refresh_channels(dpif_, n_handlers);
> + }
> + fat_rwlock_unlock(&dpif->upcall_lock);
> +
> + return error;
> }
>
> static int
> @@ -1543,38 +1700,40 @@ parse_odp_packet(struct ofpbuf *buf, struct dpif_upcall *upcall,
> }
>
> static int
> -dpif_linux_recv__(struct dpif *dpif_, struct dpif_upcall *upcall,
> - struct ofpbuf *buf)
> +dpif_linux_recv__(struct dpif *dpif_, uint32_t handler_id,
> + struct dpif_upcall *upcall, struct ofpbuf *buf)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> + struct dpif_handler *handler;
> int read_tries = 0;
>
> - if (dpif->epoll_fd < 0) {
> - return EAGAIN;
> + if (!dpif->handlers || handler_id >= dpif->n_handlers) {
> + return EAGAIN;
> }
>
> - if (dpif->event_offset >= dpif->n_events) {
> + handler = &dpif->handlers[handler_id];
> + if (handler->event_offset >= handler->n_events) {
> int retval;
>
> - dpif->event_offset = dpif->n_events = 0;
> + handler->event_offset = handler->n_events = 0;
>
> do {
> - retval = epoll_wait(dpif->epoll_fd, dpif->epoll_events,
> + retval = epoll_wait(handler->epoll_fd, handler->epoll_events,
> dpif->uc_array_size, 0);
> } while (retval < 0 && errno == EINTR);
> if (retval < 0) {
> static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
> VLOG_WARN_RL(&rl, "epoll_wait failed (%s)", ovs_strerror(errno));
> } else if (retval > 0) {
> - dpif->n_events = retval;
> + handler->n_events = retval;
> }
> }
>
> - while (dpif->event_offset < dpif->n_events) {
> - int idx = dpif->epoll_events[dpif->event_offset].data.u32;
> - struct dpif_channel *ch = &dpif->channels[idx];
> + while (handler->event_offset < handler->n_events) {
> + int idx = handler->epoll_events[handler->event_offset].data.u32;
> + struct dpif_channel *ch = &dpif->handlers[handler_id].channels[idx];
>
> - dpif->event_offset++;
> + handler->event_offset++;
>
> for (;;) {
> int dp_ifindex;
> @@ -1590,7 +1749,7 @@ dpif_linux_recv__(struct dpif *dpif_, struct dpif_upcall *upcall,
> * packets that the buffer overflowed. Try again
> * immediately because there's almost certainly a packet
> * waiting for us. */
> - report_loss(dpif_, ch);
> + report_loss(dpif_, ch, idx, handler_id);
> continue;
> }
>
> @@ -1615,29 +1774,31 @@ dpif_linux_recv__(struct dpif *dpif_, struct dpif_upcall *upcall,
> }
>
> static int
> -dpif_linux_recv(struct dpif *dpif_, uint32_t handler_id OVS_UNUSED,
> +dpif_linux_recv(struct dpif *dpif_, uint32_t handler_id,
> struct dpif_upcall *upcall, struct ofpbuf *buf)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> int error;
>
> - ovs_mutex_lock(&dpif->upcall_lock);
> - error = dpif_linux_recv__(dpif_, upcall, buf);
> - ovs_mutex_unlock(&dpif->upcall_lock);
> + fat_rwlock_rdlock(&dpif->upcall_lock);
> + error = dpif_linux_recv__(dpif_, handler_id, upcall, buf);
> + fat_rwlock_unlock(&dpif->upcall_lock);
>
> return error;
> }
>
> static void
> -dpif_linux_recv_wait(struct dpif *dpif_, uint32_t handler_id OVS_UNUSED)
> +dpif_linux_recv_wait(struct dpif *dpif_, uint32_t handler_id)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
>
> - ovs_mutex_lock(&dpif->upcall_lock);
> - if (dpif->epoll_fd >= 0) {
> - poll_fd_wait(dpif->epoll_fd, POLLIN);
> + fat_rwlock_rdlock(&dpif->upcall_lock);
> + if (dpif->handlers && handler_id < dpif->n_handlers) {
> + struct dpif_handler *handler = &dpif->handlers[handler_id];
> +
> + poll_fd_wait(handler->epoll_fd, POLLIN);
> }
> - ovs_mutex_unlock(&dpif->upcall_lock);
> + fat_rwlock_unlock(&dpif->upcall_lock);
> }
>
> static void
> @@ -1645,18 +1806,21 @@ dpif_linux_recv_purge(struct dpif *dpif_)
> {
> struct dpif_linux *dpif = dpif_linux_cast(dpif_);
>
> - ovs_mutex_lock(&dpif->upcall_lock);
> - if (dpif->epoll_fd >= 0) {
> - struct dpif_channel *ch;
> + fat_rwlock_rdlock(&dpif->upcall_lock);
> + if (dpif->handlers) {
> + size_t i, j;
> +
> + for (i = 0; i < dpif->uc_array_size; i++ ) {
> + if (!dpif->handlers[0].channels[i].sock) {
> + continue;
> + }
>
> - for (ch = dpif->channels; ch < &dpif->channels[dpif->uc_array_size];
> - ch++) {
> - if (ch->sock) {
> - nl_sock_drain(ch->sock);
> + for (j = 0; j < dpif->n_handlers; j++) {
> + nl_sock_drain(dpif->handlers[j].channels[i].sock);
> }
> }
> }
> - ovs_mutex_unlock(&dpif->upcall_lock);
> + fat_rwlock_unlock(&dpif->upcall_lock);
> }
>
> const struct dpif_class dpif_linux_class = {
> @@ -1766,7 +1930,7 @@ dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *vport,
> [OVS_VPORT_ATTR_PORT_NO] = { .type = NL_A_U32 },
> [OVS_VPORT_ATTR_TYPE] = { .type = NL_A_U32 },
> [OVS_VPORT_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
> - [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NL_A_U32 },
> + [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NL_A_UNSPEC },
> [OVS_VPORT_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_vport_stats),
> .optional = true },
> [OVS_VPORT_ATTR_OPTIONS] = { .type = NL_A_NESTED, .optional = true },
> @@ -1797,7 +1961,10 @@ dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *vport,
> vport->type = nl_attr_get_u32(a[OVS_VPORT_ATTR_TYPE]);
> vport->name = nl_attr_get_string(a[OVS_VPORT_ATTR_NAME]);
> if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
> - vport->upcall_pid = nl_attr_get(a[OVS_VPORT_ATTR_UPCALL_PID]);
> + vport->n_upcall_pids = nl_attr_get_size(a[OVS_VPORT_ATTR_UPCALL_PID])
> + / (sizeof *vport->upcall_pids);
> + vport->upcall_pids = nl_attr_get(a[OVS_VPORT_ATTR_UPCALL_PID]);
> +
> }
> if (a[OVS_VPORT_ATTR_STATS]) {
> vport->stats = nl_attr_get(a[OVS_VPORT_ATTR_STATS]);
> @@ -1835,8 +2002,10 @@ dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *vport,
> nl_msg_put_string(buf, OVS_VPORT_ATTR_NAME, vport->name);
> }
>
> - if (vport->upcall_pid) {
> - nl_msg_put_u32(buf, OVS_VPORT_ATTR_UPCALL_PID, *vport->upcall_pid);
> + if (vport->upcall_pids) {
> + nl_msg_put_unspec(buf, OVS_VPORT_ATTR_UPCALL_PID,
> + vport->upcall_pids,
> + vport->n_upcall_pids * sizeof *vport->upcall_pids);
> }
>
> if (vport->stats) {
> @@ -2241,9 +2410,9 @@ dpif_linux_flow_get_stats(const struct dpif_linux_flow *flow,
> /* Logs information about a packet that was recently lost in 'ch' (in
> * 'dpif_'). */
> static void
> -report_loss(struct dpif *dpif_, struct dpif_channel *ch)
> +report_loss(struct dpif *dpif_, struct dpif_channel *ch, uint32_t ch_idx,
> + uint32_t handler_id)
> {
> - struct dpif_linux *dpif = dpif_linux_cast(dpif_);
> static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
> struct ds s;
>
> @@ -2257,7 +2426,7 @@ report_loss(struct dpif *dpif_, struct dpif_channel *ch)
> time_msec() - ch->last_poll);
> }
>
> - VLOG_WARN("%s: lost packet on channel %"PRIdPTR"%s",
> - dpif_name(dpif_), ch - dpif->channels, ds_cstr(&s));
> + VLOG_WARN("%s: lost packet on port channel %u of handler %u",
> + dpif_name(dpif_), ch_idx, handler_id);
> ds_destroy(&s);
> }
> diff --git a/lib/dpif-linux.h b/lib/dpif-linux.h
> index ec94ccf..21d0048 100644
> --- a/lib/dpif-linux.h
> +++ b/lib/dpif-linux.h
> @@ -41,7 +41,8 @@ struct dpif_linux_vport {
> * 32-bit boundaries, so use get_unaligned_u64() to access its values.
> */
> const char *name; /* OVS_VPORT_ATTR_NAME. */
> - const uint32_t *upcall_pid; /* OVS_VPORT_ATTR_UPCALL_PID. */
> + uint32_t n_upcall_pids;
> + const uint32_t *upcall_pids; /* OVS_VPORT_ATTR_UPCALL_PID. */
> const struct ovs_vport_stats *stats; /* OVS_VPORT_ATTR_STATS. */
> const struct nlattr *options; /* OVS_VPORT_ATTR_OPTIONS. */
> size_t options_len;
> --
> 1.7.9.5
>
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