[dpdk-dev] [PATCH v4 1/3] net/af_xdp: fix umem frame size & headroom calculations

[Ciara Loftus <ciara.loftus@intel.com>]

The previous frame size calculation incorrectly used
mb_pool->private_data_size and didn't include mb_pool->header_size.
Instead of performing a manual calculation, use the
rte_mempool_calc_obj_size API to determine the frame size.

The previous frame headroom calculation also incorrectly used
mb_pool->private_data_size and didn't include mb_pool->header_size or the
mbuf priv size. Fix this.

Fixes: d8a210774e1d ("net/af_xdp: support unaligned umem chunks")
Cc: stable@dpdk.org

Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Reviewed-by: Xiaolong Ye <xiaolong.ye@intel.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index ed784dff19..111ab000cc 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -33,6 +33,7 @@
 #include <rte_log.h>
 #include <rte_memory.h>
 #include <rte_memzone.h>
+#include <rte_mempool.h>
 #include <rte_mbuf.h>
 #include <rte_malloc.h>
 #include <rte_ring.h>
@@ -754,11 +755,13 @@ xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals __rte_unused,
 	void *base_addr = NULL;
 	struct rte_mempool *mb_pool = rxq->mb_pool;
 
-	usr_config.frame_size = rte_pktmbuf_data_room_size(mb_pool) +
-					ETH_AF_XDP_MBUF_OVERHEAD +
-					mb_pool->private_data_size;
-	usr_config.frame_headroom = ETH_AF_XDP_DATA_HEADROOM +
-					mb_pool->private_data_size;
+	usr_config.frame_size = rte_mempool_calc_obj_size(mb_pool->elt_size,
+								mb_pool->flags,
+								NULL);
+	usr_config.frame_headroom = mb_pool->header_size +
+					sizeof(struct rte_mbuf) +
+					rte_pktmbuf_priv_size(mb_pool) +
+					RTE_PKTMBUF_HEADROOM;
 
 	umem = rte_zmalloc_socket("umem", sizeof(*umem), 0, rte_socket_id());
 	if (umem == NULL) {
-- 
2.17.1