[dpdk-dev] [PATCH] Fix KNI compiling issue on IBM Power

[Chao Zhu <chaozhu@linux.vnet.ibm.com>]

Because of different cache line size, the alignment of struct
rte_kni_mbuf in rte_kni_common.h doesn't work on IBM Power. This patch
changed from 64 to RTE_CACHE_LINE_SIZE micro to do the alignment.

Signed-off-by: Chao Zhu <chaozhu@linux.vnet.ibm.com>
---
 .../linuxapp/eal/include/exec-env/rte_kni_common.h |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
index e548161..6fc6442 100644
--- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
+++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_kni_common.h
@@ -67,6 +67,9 @@
  * KNI name is part of memzone name.
  */
 #define RTE_KNI_NAMESIZE 32
+#ifndef RTE_CACHE_LINE_SIZE
+#define RTE_CACHE_LINE_SIZE 64                  /**< Cache line size. */
+#endif
 
 /*
  * Request id.
@@ -108,7 +111,7 @@ struct rte_kni_fifo {
  * Padding is necessary to assure the offsets of these fields
  */
 struct rte_kni_mbuf {
-	void *buf_addr __attribute__((__aligned__(64)));
+	void *buf_addr __attribute__((__aligned__(RTE_CACHE_LINE_SIZE)));
 	char pad0[10];
 	uint16_t data_off;      /**< Start address of data in segment buffer. */
 	char pad1[4];
@@ -118,7 +121,7 @@ struct rte_kni_mbuf {
 	uint32_t pkt_len;       /**< Total pkt len: sum of all segment data_len. */
 
 	/* fields on second cache line */
-	char pad3[8] __attribute__((__aligned__(64)));
+	char pad3[8] __attribute__((__aligned__(RTE_CACHE_LINE_SIZE)));
 	void *pool;
 	void *next;
 };
-- 
1.7.1