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mbuf: detach mbuf with pinned external buffer

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Update detach routine to check the mbuf pool type.
Introduce the special internal version of detach routine to handle
the special case of pinned external bufferon mbuf freeing.

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
This commit is contained in:
Viacheslav Ovsiienko 2020-01-20 19:16:23 +00:00 committed by Thomas Monjalon
parent c621a9b66b
commit 6ef1107ad4
1 changed files with 97 additions and 10 deletions
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103
lib/librte_mbuf/rte_mbuf.h
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@ -323,6 +323,24 @@ rte_pktmbuf_priv_flags(struct rte_mempool *mp)
return mbp_priv->flags;
}
/**
* When set, pktmbuf mempool will hold only mbufs with pinned external
* buffer. The external buffer will be attached to the mbuf at the
* memory pool creation and will never be detached by the mbuf free calls.
* mbuf should not contain any room for data after the mbuf structure.
*/
#define RTE_PKTMBUF_POOL_F_PINNED_EXT_BUF (1 << 0)
/**
* Returns non zero if given mbuf has a pinned external buffer, or zero
* otherwise. The pinned external buffer is allocated at pool creation
* time and should not be freed on mbuf freeing.
*
* External buffer is a user-provided anonymous buffer.
*/
#define RTE_MBUF_HAS_PINNED_EXTBUF(mb) \
(rte_pktmbuf_priv_flags(mb->pool) & RTE_PKTMBUF_POOL_F_PINNED_EXT_BUF)
#ifdef RTE_LIBRTE_MBUF_DEBUG
/** check mbuf type in debug mode */
@ -588,7 +606,8 @@ static inline struct rte_mbuf *rte_mbuf_raw_alloc(struct rte_mempool *mp)
static __rte_always_inline void
rte_mbuf_raw_free(struct rte_mbuf *m)
{
RTE_ASSERT(RTE_MBUF_DIRECT(m));
RTE_ASSERT(!RTE_MBUF_CLONED(m) &&
(!RTE_MBUF_HAS_EXTBUF(m) || RTE_MBUF_HAS_PINNED_EXTBUF(m)));
RTE_ASSERT(rte_mbuf_refcnt_read(m) == 1);
RTE_ASSERT(m->next == NULL);
RTE_ASSERT(m->nb_segs == 1);
@ -794,7 +813,7 @@ static inline void rte_pktmbuf_reset(struct rte_mbuf *m)
m->nb_segs = 1;
m->port = MBUF_INVALID_PORT;
m->ol_flags = 0;
m->ol_flags &= EXT_ATTACHED_MBUF;
m->packet_type = 0;
rte_pktmbuf_reset_headroom(m);
@ -1153,6 +1172,11 @@ __rte_pktmbuf_free_direct(struct rte_mbuf *m)
*
* All other fields of the given packet mbuf will be left intact.
*
* If the packet mbuf was allocated from the pool with pinned
* external buffers the rte_pktmbuf_detach does nothing with the
* mbuf of this kind, because the pinned buffers are not supposed
* to be detached.
*
* @param m
* The indirect attached packet mbuf.
*/
@ -1162,11 +1186,26 @@ static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
uint32_t mbuf_size, buf_len;
uint16_t priv_size;
if (RTE_MBUF_HAS_EXTBUF(m))
__rte_pktmbuf_free_extbuf(m);
else
__rte_pktmbuf_free_direct(m);
if (RTE_MBUF_HAS_EXTBUF(m)) {
/*
* The mbuf has the external attached buffer,
* we should check the type of the memory pool where
* the mbuf was allocated from to detect the pinned
* external buffer.
*/
uint32_t flags = rte_pktmbuf_priv_flags(mp);
if (flags & RTE_PKTMBUF_POOL_F_PINNED_EXT_BUF) {
/*
* The pinned external buffer should not be
* detached from its backing mbuf, just exit.
*/
return;
}
__rte_pktmbuf_free_extbuf(m);
} else {
__rte_pktmbuf_free_direct(m);
}
priv_size = rte_pktmbuf_priv_size(mp);
mbuf_size = (uint32_t)(sizeof(struct rte_mbuf) + priv_size);
buf_len = rte_pktmbuf_data_room_size(mp);
@ -1180,6 +1219,44 @@ static inline void rte_pktmbuf_detach(struct rte_mbuf *m)
m->ol_flags = 0;
}
/**
* @internal Handle the packet mbufs with attached pinned external buffer
* on the mbuf freeing:
*
* - return zero if reference counter in shinfo is one. It means there is
* no more reference to this pinned buffer and mbuf can be returned to
* the pool
*
* - otherwise (if reference counter is not one), decrement reference
* counter and return non-zero value to prevent freeing the backing mbuf.
*
* Returns non zero if mbuf should not be freed.
*/
static inline int __rte_pktmbuf_pinned_extbuf_decref(struct rte_mbuf *m)
{
struct rte_mbuf_ext_shared_info *shinfo;
/* Clear flags, mbuf is being freed. */
m->ol_flags = EXT_ATTACHED_MBUF;
shinfo = m->shinfo;
/* Optimize for performance - do not dec/reinit */
if (likely(rte_mbuf_ext_refcnt_read(shinfo) == 1))
return 0;
/*
* Direct usage of add primitive to avoid
* duplication of comparing with one.
*/
if (likely(rte_atomic16_add_return
(&shinfo->refcnt_atomic, -1)))
return 1;
/* Reinitialize counter before mbuf freeing. */
rte_mbuf_ext_refcnt_set(shinfo, 1);
return 0;
}
/**
* Decrease reference counter and unlink a mbuf segment
*
@ -1201,8 +1278,13 @@ rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
if (likely(rte_mbuf_refcnt_read(m) == 1)) {
if (!RTE_MBUF_DIRECT(m))
if (!RTE_MBUF_DIRECT(m)) {
if (!RTE_MBUF_HAS_EXTBUF(m) ||
!RTE_MBUF_HAS_PINNED_EXTBUF(m))
rte_pktmbuf_detach(m);
else if (__rte_pktmbuf_pinned_extbuf_decref(m))
return NULL;
}
if (m->next != NULL) {
m->next = NULL;
@ -1213,8 +1295,13 @@ rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
} else if (__rte_mbuf_refcnt_update(m, -1) == 0) {
if (!RTE_MBUF_DIRECT(m))
if (!RTE_MBUF_DIRECT(m)) {
if (!RTE_MBUF_HAS_EXTBUF(m) ||
!RTE_MBUF_HAS_PINNED_EXTBUF(m))
rte_pktmbuf_detach(m);
else if (__rte_pktmbuf_pinned_extbuf_decref(m))
return NULL;
}
if (m->next != NULL) {
m->next = NULL;