[ovs-dev] [PATCH 1/2] dpif-linux: Implement the API functions to allow multiple handler threads read upcall.
Alex Wang
alexw at nicira.com
Thu Apr 17 23:04:36 UTC 2014
Thx for the review, Ethan,
On Thu, Apr 17, 2014 at 3:50 PM, Ethan Jackson <ethan at nicira.com> wrote:
> 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
>
Yeah, just checked that refresh_channels can only be set/used by main
thread. So, I'll move
the lock acquisition inside if-statement.
> I think a lot of these functions could use annotations saying whether
> they require a read/write lock from the upcall lock.
Thx for reminding me, I'll add them. my bad,
>
>
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
> >
> > _______________________________________________
> > dev mailing list
> > dev at openvswitch.org
> > http://openvswitch.org/mailman/listinfo/dev
>
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