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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vnet/vnet.h>
#include <vnet/mfib/mfib_signal.h>
#include <vppinfra/dlist.h>
/**
* @brief Pool of signals
*/
static mfib_signal_t *mfib_signal_pool;
/**
* @brief pool of dlist elements
*/
static dlist_elt_t *mfib_signal_dlist_pool;
/**
* the list/set of interfaces with signals pending
*/
typedef struct mfib_signal_q_t_
{
/**
* the dlist indext that is the head of the list
*/
u32 mip_head;
/**
* Spin lock to protect the list
*/
int mip_lock;
} mfib_signal_q_t;
/**
* @brief The pending queue of signals to deliver to the control plane
*/
static mfib_signal_q_t mfib_signal_pending ;
static void
mfib_signal_list_init (void)
{
dlist_elt_t *head;
u32 hi;
pool_get(mfib_signal_dlist_pool, head);
hi = head - mfib_signal_dlist_pool;
mfib_signal_pending.mip_head = hi;
clib_dlist_init(mfib_signal_dlist_pool, hi);
}
void
mfib_signal_module_init (void)
{
mfib_signal_list_init();
}
static inline void
mfib_signal_lock_aquire (void)
{
while (__sync_lock_test_and_set (&mfib_signal_pending.mip_lock, 1))
;
}
static inline void
mfib_signal_lock_release (void)
{
mfib_signal_pending.mip_lock = 0;
}
#define MFIB_SIGNAL_CRITICAL_SECTION(_body) \
{ \
mfib_signal_lock_aquire(); \
do { \
_body; \
} while (0); \
mfib_signal_lock_release(); \
}
int
mfib_signal_send_one (struct _unix_shared_memory_queue *q,
u32 context)
{
u32 li, si;
/*
* with the lock held, pop a signal from the q.
*/
MFIB_SIGNAL_CRITICAL_SECTION(
({
li = clib_dlist_remove_head(mfib_signal_dlist_pool,
mfib_signal_pending.mip_head);
}));
if (~0 != li)
{
mfib_signal_t *mfs;
mfib_itf_t *mfi;
dlist_elt_t *elt;
elt = pool_elt_at_index(mfib_signal_dlist_pool, li);
si = elt->value;
mfs = pool_elt_at_index(mfib_signal_pool, si);
mfi = mfib_itf_get(mfs->mfs_itf);
mfi->mfi_si = INDEX_INVALID;
__sync_fetch_and_and(&mfi->mfi_flags,
~MFIB_ITF_FLAG_SIGNAL_PRESENT);
vl_mfib_signal_send_one(q, context, mfs);
/*
* with the lock held, return the resoruces of the signals posted
*/
MFIB_SIGNAL_CRITICAL_SECTION(
({
pool_put_index(mfib_signal_pool, si);
pool_put_index(mfib_signal_dlist_pool, li);
}));
return (1);
}
return (0);
}
void
mfib_signal_push (const mfib_entry_t *mfe,
mfib_itf_t *mfi,
vlib_buffer_t *b0)
{
mfib_signal_t *mfs;
dlist_elt_t *elt;
u32 si, li;
MFIB_SIGNAL_CRITICAL_SECTION(
({
pool_get(mfib_signal_pool, mfs);
pool_get(mfib_signal_dlist_pool, elt);
si = mfs - mfib_signal_pool;
li = elt - mfib_signal_dlist_pool;
elt->value = si;
mfi->mfi_si = li;
clib_dlist_addhead(mfib_signal_dlist_pool,
mfib_signal_pending.mip_head,
li);
}));
mfs->mfs_entry = mfib_entry_get_index(mfe);
mfs->mfs_itf = mfib_itf_get_index(mfi);
if (NULL != b0)
{
mfs->mfs_buffer_len = b0->current_length;
memcpy(mfs->mfs_buffer,
vlib_buffer_get_current(b0),
(mfs->mfs_buffer_len > MFIB_SIGNAL_BUFFER_SIZE ?
MFIB_SIGNAL_BUFFER_SIZE :
mfs->mfs_buffer_len));
}
else
{
mfs->mfs_buffer_len = 0;
}
}
void
mfib_signal_remove_itf (const mfib_itf_t *mfi)
{
u32 li;
/*
* lock the queue to prevent further additions while we fiddle.
*/
li = mfi->mfi_si;
if (INDEX_INVALID != li)
{
/*
* it's in the pending q
*/
MFIB_SIGNAL_CRITICAL_SECTION(
({
dlist_elt_t *elt;
/*
* with the lock held;
* - remove the signal from the pending list
* - free up the signal and list entry obejcts
*/
clib_dlist_remove(mfib_signal_dlist_pool, li);
elt = pool_elt_at_index(mfib_signal_dlist_pool, li);
pool_put_index(mfib_signal_pool, elt->value);
pool_put(mfib_signal_dlist_pool, elt);
}));
}
}
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