From 3a7fb882fdf32e1b50faac2331b2a48d89b4212e Mon Sep 17 00:00:00 2001 From: Xiaolong Ye Date: Sat, 13 Jun 2020 23:49:19 +0800 Subject: [PATCH] mbuf: fix free space update for dynamic field The value free_space[i] is used to save the size of biggest aligned element that can fit in the zone, current implementation has one flaw, for example, if user registers dynfield1 (size = 4, align = 4, req = 124) first, the free_space would be as below after registration: 0070: 08 08 08 08 08 08 08 08 0078: 08 08 08 08 00 00 00 00 Then if user continues to register dynfield2 (size = 4, align = 4), free_space would become: 0070: 00 00 00 00 04 04 04 04 0078: 04 04 04 04 00 00 00 00 Further request dynfield3 (size = 8, align = 8) would fail to register due to alignment requirement can't be satisfied, though there is enough space remained in mbuf. This patch fixes above issue by saving alignment only in aligned zone, after the fix, above registrations order can be satisfied, free_space would be like: After dynfield1 registration: 0070: 08 08 08 08 08 08 08 08 0078: 04 04 04 04 00 00 00 00 After dynfield2 registration: 0070: 08 08 08 08 08 08 08 08 0078: 00 00 00 00 00 00 00 00 After dynfield3 registration: 0070: 00 00 00 00 00 00 00 00 0078: 00 00 00 00 00 00 00 00 This patch also reduces iterations in process_score() by jumping align steps in each loop. Fixes: 4958ca3a443a ("mbuf: support dynamic fields and flags") Cc: stable@dpdk.org Signed-off-by: Xiaolong Ye Acked-by: Olivier Matz --- lib/librte_mbuf/rte_mbuf_dyn.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/lib/librte_mbuf/rte_mbuf_dyn.c b/lib/librte_mbuf/rte_mbuf_dyn.c index de7d2eb9a5..fd51e1b68e 100644 --- a/lib/librte_mbuf/rte_mbuf_dyn.c +++ b/lib/librte_mbuf/rte_mbuf_dyn.c @@ -67,13 +67,16 @@ process_score(void) shm->free_space[i] = 1; } - for (off = 0; off < sizeof(struct rte_mbuf); off++) { + off = 0; + while (off < sizeof(struct rte_mbuf)) { /* get the size of the free zone */ for (size = 0; (off + size) < sizeof(struct rte_mbuf) && shm->free_space[off + size]; size++) ; - if (size == 0) + if (size == 0) { + off++; continue; + } /* get the alignment of biggest object that can fit in * the zone at this offset. @@ -84,8 +87,10 @@ process_score(void) ; /* save it in free_space[] */ - for (i = off; i < off + size; i++) + for (i = off; i < off + align; i++) shm->free_space[i] = RTE_MAX(align, shm->free_space[i]); + + off += align; } } -- 2.20.1