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mbuf: introduce a flag to indicate a control mbuf

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Since the flags field is now 64-bits, we can allow one bit to be used to
indicate a control i.e. non-packet mbuf. Dedicate the high bit (bit 63)
for this purpose and add in a utility macro to test if a given mbuf has
the bit set or not.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
This commit is contained in:
Bruce Richardson 2014-09-11 14:15:38 +01:00 committed by Thomas Monjalon
parent 4332beee95
commit 6b4e3fe1bf
2 changed files with 21 additions and 0 deletions
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2
lib/librte_mbuf/rte_mbuf.c
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@ -69,7 +69,9 @@ rte_ctrlmbuf_init(struct rte_mempool *mp,
void *_m,
__attribute__((unused)) unsigned i)
{
struct rte_mbuf *m = _m;
rte_pktmbuf_init(mp, opaque_arg, _m, i);
m->ol_flags |= CTRL_MBUF_FLAG;
}
/*

19
lib/librte_mbuf/rte_mbuf.h
View File

@ -91,6 +91,7 @@ extern "C" {
#define PKT_TX_IPV4_CSUM 0x1000 /**< Alias of PKT_TX_IP_CKSUM. */
#define PKT_TX_IPV4 PKT_RX_IPV4_HDR /**< IPv4 with no IP checksum offload. */
#define PKT_TX_IPV6 PKT_RX_IPV6_HDR /**< IPv6 packet */
/*
* Bit 14~13 used for L4 packet type with checksum enabled.
* 00: Reserved
@ -106,6 +107,9 @@ extern "C" {
/* Bit 15 */
#define PKT_TX_IEEE1588_TMST 0x8000 /**< TX IEEE1588 packet to timestamp. */
/* Use final bit of flags to indicate a control mbuf */
#define CTRL_MBUF_FLAG (1ULL << 63)
/**
* Bit Mask to indicate what bits required for building TX context
*/
@ -471,6 +475,21 @@ void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
*/
#define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
/**
* Tests if an mbuf is a control mbuf
*
* @param m
* The mbuf to be tested
* @return
* - True (1) if the mbuf is a control mbuf
* - False(0) otherwise
*/
static inline int
rte_is_ctrlmbuf(struct rte_mbuf *m)
{
return (!!(m->ol_flags & CTRL_MBUF_FLAG));
}
/* Operations on pkt mbuf */
/**