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 at 6wind.com> Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com> --- doc/guides/rel_notes/release_16_11.rst | 5 +++++ lib/librte_mbuf/rte_mbuf.c | 2 ++ lib/librte_mbuf/rte_mbuf.h | 7 +++++++ 3 files changed, 14 insertions(+) diff --git a/doc/guides/rel_notes/release_16_11.rst b/doc/guides/rel_notes/release_16_11.rst index 2ec63b2..c9fcfb9 100644 --- a/doc/guides/rel_notes/release_16_11.rst +++ b/doc/guides/rel_notes/release_16_11.rst @@ -115,6 +115,11 @@ New Features good, bad, or not present (useful for virtual drivers). This modification was done for IP and L4. +* **Added a LRO mbuf flag.** + + Added a new RX LRO mbuf flag, used when packets are coalesced. This + flag indicates that the segment size of original packets is known. + Resolved Issues --------------- diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c index 8d9b875..63f43c8 100644 --- a/lib/librte_mbuf/rte_mbuf.c +++ b/lib/librte_mbuf/rte_mbuf.c @@ -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; diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h index 38022a3..f5eedda 100644 --- a/lib/librte_mbuf/rte_mbuf.h +++ b/lib/librte_mbuf/rte_mbuf.h @@ -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 */ -- 2.8.1