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mbuf: add flag for LRO

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When receiving coalesced packets in virtio, the original size of the
segments is provided. This is a useful information because it allows to
resegment with the same size.

Add a RX new flag in mbuf, that can be set when packets are coalesced by
a hardware or virtual driver when the m->tso_segsz field is valid and is
set to the segment size of original packets.

This flag is used in next commits in the virtio pmd.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
This commit is contained in:
Olivier Matz 2016-10-13 16:16:06 +02:00 committed by Thomas Monjalon
parent 5842289a54
commit 6ca3a595e0
3 changed files with 11 additions and 0 deletions
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2
doc/guides/rel_notes/release_16_11.rst
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@ -52,6 +52,8 @@ New Features
* Added new Rx checksum flags in mbufs to describe more states: unknown,
good, bad, or not present (useful for virtual drivers). This modification
was done for IP and L4.
* Added a new RX LRO mbuf flag, used when packets are coalesced. This
flag indicates that the segment size of original packets is known.
* **Added vhost-user dequeue zero copy support**

2
lib/librte_mbuf/rte_mbuf.c
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@ -319,6 +319,7 @@ const char *rte_get_rx_ol_flag_name(uint64_t mask)
case PKT_RX_IEEE1588_PTP: return "PKT_RX_IEEE1588_PTP";
case PKT_RX_IEEE1588_TMST: return "PKT_RX_IEEE1588_TMST";
case PKT_RX_QINQ_STRIPPED: return "PKT_RX_QINQ_STRIPPED";
case PKT_RX_LRO: return "PKT_RX_LRO";
default: return NULL;
}
}
@ -352,6 +353,7 @@ rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen)
{ PKT_RX_IEEE1588_PTP, PKT_RX_IEEE1588_PTP, NULL },
{ PKT_RX_IEEE1588_TMST, PKT_RX_IEEE1588_TMST, NULL },
{ PKT_RX_QINQ_STRIPPED, PKT_RX_QINQ_STRIPPED, NULL },
{ PKT_RX_LRO, PKT_RX_LRO, NULL },
};
const char *name;
unsigned int i;

7
lib/librte_mbuf/rte_mbuf.h
View File

@ -170,6 +170,13 @@ extern "C" {
*/
#define PKT_RX_QINQ_PKT PKT_RX_QINQ_STRIPPED
/**
* When packets are coalesced by a hardware or virtual driver, this flag
* can be set in the RX mbuf, meaning that the m->tso_segsz field is
* valid and is set to the segment size of original packets.
*/
#define PKT_RX_LRO (1ULL << 16)
/* add new RX flags here */
/* add new TX flags here */