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datapath: Convert datapath operations to use Netlink framing.

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Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Ben Pfaff
2011-01-26 15:42:00 -08:00
parent 9c52546b52
commit d656937779
6 changed files with 1455 additions and 991 deletions
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694
lib/dpif-linux.c
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@@ -47,11 +47,64 @@
#include "rtnetlink-link.h"
#include "shash.h"
#include "svec.h"
#include "unaligned.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_linux);
struct dpif_linux_dp {
/* ioctl command argument. */
int cmd;
/* struct odp_datapath header. */
uint32_t dp_idx;
/* Attributes. */
const char *name; /* ODP_DP_ATTR_NAME. */
struct odp_stats stats; /* ODP_DP_ATTR_STATS. */
enum odp_frag_handling ipv4_frags; /* ODP_DP_ATTR_IPV4_FRAGS. */
const uint32_t *sampling; /* ODP_DP_ATTR_SAMPLING. */
};
static void dpif_linux_dp_init(struct dpif_linux_dp *);
static int dpif_linux_dp_transact(const struct dpif_linux_dp *request,
struct dpif_linux_dp *reply,
struct ofpbuf **bufp);
static int dpif_linux_dp_get(const struct dpif *, struct dpif_linux_dp *reply,
struct ofpbuf **bufp);
struct dpif_linux_flow {
/* ioctl command argument. */
int cmd;
/* struct odp_flow header. */
unsigned int nlmsg_flags;
uint32_t dp_idx;
/* Attributes.
*
* The 'stats', 'used', and 'state' members point to 64-bit data that might
* only be aligned on 32-bit boundaries, so get_unaligned_u64() should be
* used to access their values. */
const struct nlattr *key; /* ODP_FLOW_ATTR_KEY. */
size_t key_len;
const struct nlattr *actions; /* ODP_FLOW_ATTR_ACTIONS. */
size_t actions_len;
const struct odp_flow_stats *stats; /* ODP_FLOW_ATTR_STATS. */
const uint8_t *tcp_flags; /* ODP_FLOW_ATTR_TCP_FLAGS. */
const uint64_t *used; /* ODP_FLOW_ATTR_USED. */
bool clear; /* ODP_FLOW_ATTR_CLEAR. */
const uint64_t *state; /* ODP_FLOW_ATTR_STATE. */
};
static void dpif_linux_flow_init(struct dpif_linux_flow *);
static int dpif_linux_flow_transact(const struct dpif_linux_flow *request,
struct dpif_linux_flow *reply,
struct ofpbuf **bufp);
static void dpif_linux_flow_get_stats(const struct dpif_linux_flow *,
struct dpif_flow_stats *);
/* Datapath interface for the openvswitch Linux kernel module. */
struct dpif_linux {
struct dpif dpif;
@@ -74,7 +127,6 @@ static int do_ioctl(const struct dpif *, int cmd, const void *arg);
static int open_dpif(const struct dpif_linux_vport *local_vport,
struct dpif **);
static int get_openvswitch_major(void);
static int create_minor(const char *name, int minor);
static int open_minor(int minor, int *fdp);
static int make_openvswitch_device(int minor, char **fnp);
static void dpif_linux_port_changed(const struct rtnetlink_link_change *,
@@ -90,9 +142,8 @@ dpif_linux_cast(const struct dpif *dpif)
static int
dpif_linux_enumerate(struct svec *all_dps)
{
uint32_t dp_idx;
int major;
int error;
int i;
/* Check that the Open vSwitch module is loaded. */
major = get_openvswitch_major();
@@ -100,22 +151,28 @@ dpif_linux_enumerate(struct svec *all_dps)
return -major;
}
error = 0;
for (i = 0; i < ODP_MAX; i++) {
struct dpif *dpif;
dp_idx = 0;
for (;;) {
struct dpif_linux_dp request, reply;
struct ofpbuf *buf;
char devname[16];
int retval;
int error;
sprintf(devname, "dp%d", i);
retval = dpif_open(devname, "system", &dpif);
if (!retval) {
svec_add(all_dps, devname);
dpif_uninit(dpif, true);
} else if (retval != ENODEV && !error) {
error = retval;
dpif_linux_dp_init(&request);
request.dp_idx = dp_idx;
request.cmd = ODP_DP_DUMP;
error = dpif_linux_dp_transact(&request, &reply, &buf);
if (error) {
return error == ENODEV ? 0 : error;
}
ofpbuf_delete(buf);
sprintf(devname, "dp%d", reply.dp_idx);
svec_add(all_dps, devname);
dp_idx = reply.dp_idx + 1;
}
return error;
}
static int
@@ -130,27 +187,20 @@ dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
minor = !strncmp(name, "dp", 2)
&& isdigit((unsigned char)name[2]) ? atoi(name + 2) : -1;
if (create) {
if (minor >= 0) {
error = create_minor(name, minor);
if (error) {
return error;
}
} else {
/* Scan for unused minor number. */
for (minor = 0; ; minor++) {
if (minor >= ODP_MAX) {
/* All datapath numbers in use. */
return ENOBUFS;
}
struct dpif_linux_dp request, reply;
struct ofpbuf *buf;
int error;
error = create_minor(name, minor);
if (!error) {
break;
} else if (error != EBUSY) {
return error;
}
}
dpif_linux_dp_init(&request);
request.cmd = ODP_DP_NEW;
request.dp_idx = minor;
request.name = name;
error = dpif_linux_dp_transact(&request, &reply, &buf);
if (error) {
return error;
}
minor = reply.dp_idx;
ofpbuf_delete(buf);
}
dpif_linux_vport_init(&request);
@@ -245,25 +295,41 @@ dpif_linux_get_all_names(const struct dpif *dpif_, struct svec *all_names)
static int
dpif_linux_destroy(struct dpif *dpif_)
{
return do_ioctl(dpif_, ODP_DP_DESTROY, NULL);
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp dp;
dpif_linux_dp_init(&dp);
dp.cmd = ODP_DP_DEL;
dp.dp_idx = dpif->minor;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static int
dpif_linux_get_stats(const struct dpif *dpif_, struct odp_stats *stats)
{
memset(stats, 0, sizeof *stats);
return do_ioctl(dpif_, ODP_DP_STATS, stats);
struct dpif_linux_dp dp;
struct ofpbuf *buf;
int error;
error = dpif_linux_dp_get(dpif_, &dp, &buf);
if (!error) {
*stats = dp.stats;
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_get_drop_frags(const struct dpif *dpif_, bool *drop_fragsp)
{
int drop_frags;
struct dpif_linux_dp dp;
struct ofpbuf *buf;
int error;
error = do_ioctl(dpif_, ODP_GET_DROP_FRAGS, &drop_frags);
error = dpif_linux_dp_get(dpif_, &dp, &buf);
if (!error) {
*drop_fragsp = drop_frags & 1;
*drop_fragsp = dp.ipv4_frags == ODP_DP_FRAG_DROP;
ofpbuf_delete(buf);
}
return error;
}
@@ -271,8 +337,14 @@ dpif_linux_get_drop_frags(const struct dpif *dpif_, bool *drop_fragsp)
static int
dpif_linux_set_drop_frags(struct dpif *dpif_, bool drop_frags)
{
int drop_frags_int = drop_frags;
return do_ioctl(dpif_, ODP_SET_DROP_FRAGS, &drop_frags_int);
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp dp;
dpif_linux_dp_init(&dp);
dp.cmd = ODP_DP_SET;
dp.dp_idx = dpif->minor;
dp.ipv4_frags = drop_frags ? ODP_DP_FRAG_DROP : ODP_DP_FRAG_ZERO;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static int
@@ -460,48 +532,32 @@ dpif_linux_port_poll_wait(const struct dpif *dpif_)
}
}
static void
odp_flow_stats_to_dpif_flow_stats(const struct odp_flow_stats *ofs,
struct dpif_flow_stats *dfs)
{
dfs->n_packets = ofs->n_packets;
dfs->n_bytes = ofs->n_bytes;
dfs->used = ofs->used_sec * 1000 + ofs->used_nsec / 1000000;
dfs->tcp_flags = ofs->tcp_flags;
}
static int
dpif_linux_flow_get(const struct dpif *dpif_,
const struct nlattr *key, size_t key_len,
struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct ofpbuf *actions = NULL;
struct odp_flow odp_flow;
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
memset(&odp_flow, 0, sizeof odp_flow);
odp_flow.dp_idx = dpif->minor;
odp_flow.key = (struct nlattr *) key;
odp_flow.key_len = key_len;
if (actionsp) {
actions = *actionsp = ofpbuf_new(65536);
odp_flow.actions = actions->base;
odp_flow.actions_len = actions->allocated;
}
error = do_ioctl(dpif_, ODP_FLOW_GET, &odp_flow);
dpif_linux_flow_init(&request);
request.cmd = ODP_FLOW_GET;
request.dp_idx = dpif->minor;
request.key = key;
request.key_len = key_len;
error = dpif_linux_flow_transact(&request, &reply, &buf);
if (!error) {
if (stats) {
odp_flow_stats_to_dpif_flow_stats(&odp_flow.stats, stats);
dpif_linux_flow_get_stats(&reply, stats);
}
if (actions) {
actions->size = odp_flow.actions_len;
ofpbuf_trim(actions);
}
} else {
if (actions) {
ofpbuf_delete(actions);
if (actionsp) {
buf->data = (void *) reply.actions;
buf->size = reply.actions_len;
*actionsp = buf;
} else {
ofpbuf_delete(buf);
}
}
return error;
@@ -514,28 +570,27 @@ dpif_linux_flow_put(struct dpif *dpif_, enum dpif_flow_put_flags flags,
struct dpif_flow_stats *stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct odp_flow_put put;
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
memset(&put, 0, sizeof put);
put.flow.dp_idx = dpif->minor;
put.flow.key = (struct nlattr *) key;
put.flow.key_len = key_len;
put.flow.actions = (struct nlattr *) actions;
put.flow.actions_len = actions_len;
put.flags = 0;
if (flags & DPIF_FP_CREATE) {
put.flags |= ODPPF_CREATE;
}
if (flags & DPIF_FP_MODIFY) {
put.flags |= ODPPF_MODIFY;
}
dpif_linux_flow_init(&request);
request.cmd = flags & DPIF_FP_CREATE ? ODP_FLOW_NEW : ODP_FLOW_SET;
request.dp_idx = dpif->minor;
request.key = key;
request.key_len = key_len;
request.actions = actions;
request.actions_len = actions_len;
if (flags & DPIF_FP_ZERO_STATS) {
put.flags |= ODPPF_ZERO_STATS;
request.clear = true;
}
error = do_ioctl(dpif_, ODP_FLOW_PUT, &put);
request.nlmsg_flags = flags & DPIF_FP_MODIFY ? 0 : NLM_F_CREATE;
error = dpif_linux_flow_transact(&request,
stats ? &reply : NULL,
stats ? &buf : NULL);
if (!error && stats) {
odp_flow_stats_to_dpif_flow_stats(&put.flow.stats, stats);
dpif_linux_flow_get_stats(&reply, stats);
ofpbuf_delete(buf);
}
return error;
}
@@ -546,84 +601,81 @@ dpif_linux_flow_del(struct dpif *dpif_,
struct dpif_flow_stats *stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct odp_flow odp_flow;
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
memset(&odp_flow, 0, sizeof odp_flow);
odp_flow.dp_idx = dpif->minor;
odp_flow.key = (struct nlattr *) key;
odp_flow.key_len = key_len;
error = do_ioctl(dpif_, ODP_FLOW_DEL, &odp_flow);
dpif_linux_flow_init(&request);
request.cmd = ODP_FLOW_DEL;
request.dp_idx = dpif->minor;
request.key = key;
request.key_len = key_len;
error = dpif_linux_flow_transact(&request,
stats ? &reply : NULL,
stats ? &buf : NULL);
if (!error && stats) {
odp_flow_stats_to_dpif_flow_stats(&odp_flow.stats, stats);
dpif_linux_flow_get_stats(&reply, stats);
ofpbuf_delete(buf);
}
return error;
}
struct dpif_linux_flow_state {
struct odp_flow_dump dump;
struct odp_flow flow;
uint32_t keybuf[ODPUTIL_FLOW_KEY_U32S];
uint32_t actionsbuf[65536 / sizeof(uint32_t)];
struct dpif_linux_flow flow;
struct ofpbuf *buf;
struct dpif_flow_stats stats;
};
static int
dpif_linux_flow_dump_start(const struct dpif *dpif_, void **statep)
dpif_linux_flow_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow_state *state;
*statep = state = xmalloc(sizeof *state);
state->dump.dp_idx = dpif->minor;
state->dump.state[0] = 0;
state->dump.state[1] = 0;
state->dump.flow = &state->flow;
*statep = xzalloc(sizeof(struct dpif_linux_flow_state));
return 0;
}
static int
dpif_linux_flow_dump_next(const struct dpif *dpif, void *state_,
dpif_linux_flow_dump_next(const struct dpif *dpif_, void *state_,
const struct nlattr **key, size_t *key_len,
const struct nlattr **actions, size_t *actions_len,
const struct dpif_flow_stats **stats)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow_state *state = state_;
struct ofpbuf *old_buf = state->buf;
struct dpif_linux_flow request;
int error;
memset(&state->flow, 0, sizeof state->flow);
state->flow.key = (struct nlattr *) state->keybuf;
state->flow.key_len = sizeof state->keybuf;
if (actions) {
state->flow.actions = (struct nlattr *) state->actionsbuf;
state->flow.actions_len = sizeof state->actionsbuf;
}
dpif_linux_flow_init(&request);
request.cmd = ODP_FLOW_DUMP;
request.dp_idx = dpif->minor;
request.state = state->flow.state;
error = dpif_linux_flow_transact(&request, &state->flow, &state->buf);
ofpbuf_delete(old_buf);
error = do_ioctl(dpif, ODP_FLOW_DUMP, &state->dump);
if (!error) {
if (!state->flow.key_len) {
return EOF;
}
if (key) {
*key = (const struct nlattr *) state->keybuf;
*key = state->flow.key;
*key_len = state->flow.key_len;
}
if (actions) {
*actions = (const struct nlattr *) state->actionsbuf;
*actions = state->flow.actions;
*actions_len = state->flow.actions_len;
}
if (stats) {
odp_flow_stats_to_dpif_flow_stats(&state->flow.stats,
&state->stats);
dpif_linux_flow_get_stats(&state->flow, &state->stats);
*stats = &state->stats;
}
}
return error;
return error == ENODEV ? EOF : error;
}
static int
dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state)
dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dpif_linux_flow_state *state = state_;
ofpbuf_delete(state->buf);
free(state);
return 0;
}
@@ -661,13 +713,29 @@ static int
dpif_linux_get_sflow_probability(const struct dpif *dpif_,
uint32_t *probability)
{
return do_ioctl(dpif_, ODP_GET_SFLOW_PROBABILITY, probability);
struct dpif_linux_dp dp;
struct ofpbuf *buf;
int error;
error = dpif_linux_dp_get(dpif_, &dp, &buf);
if (!error) {
*probability = dp.sampling ? *dp.sampling : 0;
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_set_sflow_probability(struct dpif *dpif_, uint32_t probability)
{
return do_ioctl(dpif_, ODP_SET_SFLOW_PROBABILITY, &probability);
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp dp;
dpif_linux_dp_init(&dp);
dp.cmd = ODP_DP_SET;
dp.dp_idx = dpif->minor;
dp.sampling = &probability;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static int
@@ -985,22 +1053,6 @@ get_major(const char *target)
return -ENODEV;
}
static int
create_minor(const char *name, int minor)
{
int error;
int fd;
error = open_minor(minor, &fd);
if (error) {
return error;
}
error = ioctl(fd, ODP_DP_CREATE, name) ? errno : 0;
close(fd);
return error;
}
static int
open_minor(int minor, int *fdp)
{
@@ -1042,6 +1094,24 @@ dpif_linux_port_changed(const struct rtnetlink_link_change *change,
dpif->change_error = true;
}
}
static int
get_dp0_fd(int *dp0_fdp)
{
static int dp0_fd = -1;
if (dp0_fd < 0) {
int error;
int fd;
error = open_minor(0, &fd);
if (error) {
return error;
}
dp0_fd = fd;
}
*dp0_fdp = dp0_fd;
return 0;
}
/* Parses the contents of 'buf', which contains a "struct odp_vport" followed
* by Netlink attributes, into 'vport'. Returns 0 if successful, otherwise a
@@ -1183,25 +1253,21 @@ dpif_linux_vport_transact(const struct dpif_linux_vport *request,
struct dpif_linux_vport *reply,
struct ofpbuf **bufp)
{
static int dp0_fd = -1;
struct ofpbuf *buf = NULL;
int error;
int fd;
assert((reply != NULL) == (bufp != NULL));
if (dp0_fd < 0) {
int fd;
error = open_minor(0, &fd);
if (error) {
goto error;
}
dp0_fd = fd;
error = get_dp0_fd(&fd);
if (error) {
goto error;
}
buf = ofpbuf_new(1024);
dpif_linux_vport_to_ofpbuf(request, buf);
error = ioctl(dp0_fd, request->cmd, buf->data) ? errno : 0;
error = ioctl(fd, request->cmd, buf->data) ? errno : 0;
if (error) {
goto error;
}
@@ -1242,4 +1308,322 @@ dpif_linux_vport_get(const char *name, struct dpif_linux_vport *reply,
return dpif_linux_vport_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct odp_datapath"
* followed by Netlink attributes, into 'dp'. Returns 0 if successful,
* otherwise a positive errno value.
*
* 'dp' will contain pointers into 'buf', so the caller should not free 'buf'
* while 'dp' is still in use. */
static int
dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *dp, const struct ofpbuf *buf)
{
static const struct nl_policy odp_datapath_policy[] = {
[ODP_DP_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
[ODP_DP_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct odp_stats),
.max_len = sizeof(struct odp_stats),
.optional = true },
[ODP_DP_ATTR_IPV4_FRAGS] = { .type = NL_A_U32, .optional = true },
[ODP_DP_ATTR_SAMPLING] = { .type = NL_A_U32, .optional = true },
};
struct odp_datapath *odp_dp;
struct nlattr *a[ARRAY_SIZE(odp_datapath_policy)];
dpif_linux_dp_init(dp);
if (!nl_policy_parse(buf, sizeof *odp_dp, odp_datapath_policy,
a, ARRAY_SIZE(odp_datapath_policy))) {
return EINVAL;
}
odp_dp = buf->data;
dp->dp_idx = odp_dp->dp_idx;
dp->name = nl_attr_get_string(a[ODP_DP_ATTR_NAME]);
if (a[ODP_DP_ATTR_STATS]) {
/* Can't use structure assignment because Netlink doesn't ensure
* sufficient alignment for 64-bit members. */
memcpy(&dp->stats, nl_attr_get(a[ODP_DP_ATTR_STATS]),
sizeof dp->stats);
}
if (a[ODP_DP_ATTR_IPV4_FRAGS]) {
dp->ipv4_frags = nl_attr_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]);
}
if (a[ODP_DP_ATTR_SAMPLING]) {
dp->sampling = nl_attr_get(a[ODP_DP_ATTR_SAMPLING]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct odp_datapath"
* followed by Netlink attributes corresponding to 'dp'. */
static void
dpif_linux_dp_to_ofpbuf(const struct dpif_linux_dp *dp, struct ofpbuf *buf)
{
struct odp_datapath *odp_dp;
ofpbuf_reserve(buf, sizeof odp_dp);
if (dp->name) {
nl_msg_put_string(buf, ODP_DP_ATTR_NAME, dp->name);
}
/* Skip ODP_DP_ATTR_STATS since we never have a reason to serialize it. */
if (dp->ipv4_frags) {
nl_msg_put_u32(buf, ODP_DP_ATTR_IPV4_FRAGS, dp->ipv4_frags);
}
if (dp->sampling) {
nl_msg_put_u32(buf, ODP_DP_ATTR_SAMPLING, *dp->sampling);
}
odp_dp = ofpbuf_push_uninit(buf, sizeof *odp_dp);
odp_dp->dp_idx = dp->dp_idx;
odp_dp->len = buf->size;
odp_dp->total_len = (char *) ofpbuf_end(buf) - (char *) buf->data;
}
/* Clears 'dp' to "empty" values. */
void
dpif_linux_dp_init(struct dpif_linux_dp *dp)
{
memset(dp, 0, sizeof *dp);
dp->dp_idx = -1;
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be an odp_datapath also, which is
* decoded and stored in '*reply' and '*bufp'. The caller must free '*bufp'
* when the reply is no longer needed ('reply' will contain pointers into
* '*bufp'). */
int
dpif_linux_dp_transact(const struct dpif_linux_dp *request,
struct dpif_linux_dp *reply, struct ofpbuf **bufp)
{
struct ofpbuf *buf = NULL;
int error;
int fd;
assert((reply != NULL) == (bufp != NULL));
error = get_dp0_fd(&fd);
if (error) {
goto error;
}
buf = ofpbuf_new(1024);
dpif_linux_dp_to_ofpbuf(request, buf);
error = ioctl(fd, request->cmd, buf->data) ? errno : 0;
if (error) {
goto error;
}
if (bufp) {
buf->size = ((struct odp_datapath *) buf->data)->len;
error = dpif_linux_dp_from_ofpbuf(reply, buf);
if (error) {
goto error;
}
*bufp = buf;
} else {
ofpbuf_delete(buf);
}
return 0;
error:
ofpbuf_delete(buf);
if (bufp) {
memset(reply, 0, sizeof *reply);
*bufp = NULL;
}
return error;
}
/* Obtains information about 'dpif_' and stores it into '*reply' and '*bufp'.
* The caller must free '*bufp' when the reply is no longer needed ('reply'
* will contain pointers into '*bufp'). */
int
dpif_linux_dp_get(const struct dpif *dpif_, struct dpif_linux_dp *reply,
struct ofpbuf **bufp)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp request;
dpif_linux_dp_init(&request);
request.cmd = ODP_DP_GET;
request.dp_idx = dpif->minor;
return dpif_linux_dp_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct odp_flow" followed by
* Netlink attributes, into 'flow'. Returns 0 if successful, otherwise a
* positive errno value.
*
* 'flow' will contain pointers into 'buf', so the caller should not free 'buf'
* while 'flow' is still in use. */
static int
dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *flow,
const struct ofpbuf *buf)
{
static const struct nl_policy odp_flow_policy[] = {
[ODP_FLOW_ATTR_KEY] = { .type = NL_A_NESTED },
[ODP_FLOW_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
[ODP_FLOW_ATTR_STATS] = { .type = NL_A_UNSPEC,
.min_len = sizeof(struct odp_flow_stats),
.max_len = sizeof(struct odp_flow_stats),
.optional = true },
[ODP_FLOW_ATTR_TCP_FLAGS] = { .type = NL_A_U8, .optional = true },
[ODP_FLOW_ATTR_USED] = { .type = NL_A_U64, .optional = true },
/* The kernel never uses ODP_FLOW_ATTR_CLEAR. */
[ODP_FLOW_ATTR_STATE] = { .type = NL_A_U64, .optional = true },
};
struct odp_flow *odp_flow;
struct nlattr *a[ARRAY_SIZE(odp_flow_policy)];
dpif_linux_flow_init(flow);
if (!nl_policy_parse(buf, sizeof *odp_flow, odp_flow_policy,
a, ARRAY_SIZE(odp_flow_policy))) {
return EINVAL;
}
odp_flow = buf->data;
flow->nlmsg_flags = odp_flow->nlmsg_flags;
flow->dp_idx = odp_flow->dp_idx;
flow->key = nl_attr_get(a[ODP_FLOW_ATTR_KEY]);
flow->key_len = nl_attr_get_size(a[ODP_FLOW_ATTR_KEY]);
if (a[ODP_FLOW_ATTR_ACTIONS]) {
flow->actions = nl_attr_get(a[ODP_FLOW_ATTR_ACTIONS]);
flow->actions_len = nl_attr_get_size(a[ODP_FLOW_ATTR_ACTIONS]);
}
if (a[ODP_FLOW_ATTR_STATS]) {
flow->stats = nl_attr_get(a[ODP_FLOW_ATTR_STATS]);
}
if (a[ODP_FLOW_ATTR_TCP_FLAGS]) {
flow->tcp_flags = nl_attr_get(a[ODP_FLOW_ATTR_TCP_FLAGS]);
}
if (a[ODP_FLOW_ATTR_STATE]) {
flow->state = nl_attr_get(a[ODP_FLOW_ATTR_STATE]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct odp_flow"
* followed by Netlink attributes corresponding to 'flow'. */
static void
dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *flow,
struct ofpbuf *buf)
{
struct odp_flow *odp_flow;
ofpbuf_reserve(buf, sizeof odp_flow);
if (flow->key_len) {
nl_msg_put_unspec(buf, ODP_FLOW_ATTR_KEY, flow->key, flow->key_len);
}
if (flow->actions_len) {
nl_msg_put_unspec(buf, ODP_FLOW_ATTR_ACTIONS,
flow->actions, flow->actions_len);
}
/* We never need to send these to the kernel. */
assert(!flow->stats);
assert(!flow->tcp_flags);
assert(!flow->used);
if (flow->clear) {
nl_msg_put_flag(buf, ODP_FLOW_ATTR_CLEAR);
}
if (flow->state) {
nl_msg_put_u64(buf, ODP_FLOW_ATTR_STATE,
get_unaligned_u64(flow->state));
}
odp_flow = ofpbuf_push_uninit(buf, sizeof *odp_flow);
odp_flow->nlmsg_flags = flow->nlmsg_flags;
odp_flow->dp_idx = flow->dp_idx;
odp_flow->len = buf->size;
odp_flow->total_len = (char *) ofpbuf_end(buf) - (char *) buf->data;
}
/* Clears 'flow' to "empty" values. */
void
dpif_linux_flow_init(struct dpif_linux_flow *flow)
{
memset(flow, 0, sizeof *flow);
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be an odp_flow also, which is decoded
* and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
* reply is no longer needed ('reply' will contain pointers into '*bufp'). */
int
dpif_linux_flow_transact(const struct dpif_linux_flow *request,
struct dpif_linux_flow *reply, struct ofpbuf **bufp)
{
struct ofpbuf *buf = NULL;
int error;
int fd;
assert((reply != NULL) == (bufp != NULL));
error = get_dp0_fd(&fd);
if (error) {
goto error;
}
buf = ofpbuf_new(1024);
dpif_linux_flow_to_ofpbuf(request, buf);
error = ioctl(fd, request->cmd, buf->data) ? errno : 0;
if (error) {
goto error;
}
if (bufp) {
buf->size = ((struct odp_flow *) buf->data)->len;
error = dpif_linux_flow_from_ofpbuf(reply, buf);
if (error) {
goto error;
}
*bufp = buf;
} else {
ofpbuf_delete(buf);
}
return 0;
error:
ofpbuf_delete(buf);
if (bufp) {
memset(reply, 0, sizeof *reply);
*bufp = NULL;
}
return error;
}
static void
dpif_linux_flow_get_stats(const struct dpif_linux_flow *flow,
struct dpif_flow_stats *stats)
{
if (flow->stats) {
stats->n_packets = get_unaligned_u64(&flow->stats->n_packets);
stats->n_bytes = get_unaligned_u64(&flow->stats->n_bytes);
} else {
stats->n_packets = 0;
stats->n_bytes = 0;
}
stats->used = flow->used ? get_unaligned_u64(flow->used) : 0;
stats->tcp_flags = flow->tcp_flags ? *flow->tcp_flags : 0;
}