[dpdk-dev] [PATCH] mbuf: properly cast shared data
David Marchand
david.marchand at 6wind.com
Wed May 16 13:10:40 CEST 2018
Including rte_mbuf.h in C++ triggers the following warning as C++ does not
allow implicit casting of a void *.
In file included from test.cpp:1:0:
x86_64-native-linuxapp-gcc/include/rte_mbuf.h: In function
‘rte_mbuf_ext_shared_info* rte_pktmbuf_ext_shinfo_init_helper(void*, uint16_t*,
rte_mbuf_extbuf_free_callback_t, void*)’:
x86_64-native-linuxapp-gcc/include/rte_mbuf.h:1349:9: error: invalid conversion
from ‘void*’ to ‘rte_mbuf_ext_shared_info*’ [-fpermissive]
shinfo = RTE_PTR_ALIGN_FLOOR(RTE_PTR_SUB(buf_end,
^
Fixes: a53aa2b9f3be ("mbuf: support attaching external buffer")
Signed-off-by: David Marchand <david.marchand at 6wind.com>
---
lib/librte_mbuf/rte_mbuf.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 4fd9a0d..eab13c6 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -1345,12 +1345,14 @@ rte_pktmbuf_ext_shinfo_init_helper(void *buf_addr, uint16_t *buf_len,
{
struct rte_mbuf_ext_shared_info *shinfo;
void *buf_end = RTE_PTR_ADD(buf_addr, *buf_len);
+ void *addr;
- shinfo = RTE_PTR_ALIGN_FLOOR(RTE_PTR_SUB(buf_end,
- sizeof(*shinfo)), sizeof(uintptr_t));
- if ((void *)shinfo <= buf_addr)
+ addr = RTE_PTR_ALIGN_FLOOR(RTE_PTR_SUB(buf_end, sizeof(*shinfo)),
+ sizeof(uintptr_t));
+ if (addr <= buf_addr)
return NULL;
+ shinfo = (struct rte_mbuf_ext_shared_info *)addr;
shinfo->free_cb = free_cb;
shinfo->fcb_opaque = fcb_opaque;
rte_mbuf_ext_refcnt_set(shinfo, 1);
--
2.7.4
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