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dpif-linux: Implement the API functions to allow multiple handler threads read upcall.

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Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
This commit is contained in:
Alex Wang
2014-02-26 10:10:29 -08:00
parent 4f15074492
commit 1579cf677f
2 changed files with 365 additions and 195 deletions
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557
lib/dpif-linux.c
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@@ -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);
/* 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);
nl_sock_destroy(ch->sock);
}
free(dpif->channels);
dpif->channels = NULL;
dpif->uc_array_size = 0;
return socksp;
free(dpif->epoll_events);
dpif->epoll_events = NULL;
dpif->n_events = dpif->event_offset = 0;
error:
vport_del_socksp(socksp, n_socks);
/* 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 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]);
}
}
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;
/* 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;
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];
dpif->epoll_events = xrealloc(dpif->epoll_events,
new_size * sizeof *dpif->epoll_events);
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->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;
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;
}
nl_sock_destroy(dpif->channels[port_idx].sock);
dpif->channels[port_idx].sock = sock;
dpif->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];
nl_sock_destroy(ch->sock);
ch->sock = NULL;
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);
}
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);
}
@@ -410,9 +534,12 @@ static void
dpif_linux_run(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (dpif->refresh_channels) {
dpif->refresh_channels = false;
dpif_linux_refresh_channels(dpif_);
fat_rwlock_wrlock(&dpif->upcall_lock);
dpif_linux_refresh_channels(dpif_, dpif->n_handlers);
fat_rwlock_unlock(&dpif->upcall_lock);
}
}
@@ -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;
}
ofpbuf_delete(buf);
if (sock) {
error = add_channel(dpif, *port_nop, sock);
vport_del_socksp(socksp, dpif->n_handlers);
goto exit;
}
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_wrlock(&dpif->upcall_lock);
if (dpif->handlers) {
size_t i, j;
for (ch = dpif->channels; ch < &dpif->channels[dpif->uc_array_size];
ch++) {
if (ch->sock) {
nl_sock_drain(ch->sock);
for (i = 0; i < dpif->uc_array_size; i++ ) {
if (!dpif->handlers[0].channels[i].sock) {
continue;
}
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);
}

3
lib/dpif-linux.h
View File

@@ -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;