Cache align Rx and Tx queue struct to avoid false sharing.
The RX struct happens to be 64 bytes on x86_64 already, so cache
alignment has no effect there, but it does on 32-bit ISAs.
The TX struct is 56 bytes on x86_64.
Both structs keep counters, and in the RX case they are updated even
for empty polls.
v3: Move __rte_cache_aligned directive to a MSVC-compatible location.
Fixes: 364e08f2bbc0 ("af_packet: add PMD for AF_PACKET-based virtual devices")
Cc: sta...@dpdk.org
Signed-off-by: Mattias Rönnblom <mattias.ronnb...@ericsson.com>
---
drivers/net/af_packet/rte_eth_af_packet.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/af_packet/rte_eth_af_packet.c
b/drivers/net/af_packet/rte_eth_af_packet.c
index 397a32db58..6b7b16f348 100644
--- a/drivers/net/af_packet/rte_eth_af_packet.c
+++ b/drivers/net/af_packet/rte_eth_af_packet.c
@@ -6,6 +6,7 @@
* All rights reserved.
*/
+#include <rte_common.h>
#include <rte_string_fns.h>
#include <rte_mbuf.h>
#include <ethdev_driver.h>
@@ -39,7 +40,7 @@
#define DFLT_FRAME_SIZE (1 << 11)
#define DFLT_FRAME_COUNT (1 << 9)
-struct pkt_rx_queue {
+struct __rte_cache_aligned pkt_rx_queue {
int sockfd;
struct iovec *rd;
@@ -55,7 +56,7 @@ struct pkt_rx_queue {
volatile unsigned long rx_bytes;
};
-struct pkt_tx_queue {
+struct __rte_cache_aligned pkt_tx_queue {
int sockfd;
unsigned int frame_data_size;
--
2.34.1
