[PATCH v2 3/5] net/iavf: fix Rx data buffer size

[Wenjun Wu <wenjun1.wu@intel.com>]

No matter what the mbuf size is, the data buffer size should not
be greater than 16K - 128.

Fixes: 69dd4c3d0898 ("net/avf: enable queue and device")
Cc: stable@dpdk.org

Signed-off-by: Wenjun Wu <wenjun1.wu@intel.com>
---
 drivers/net/iavf/iavf_rxtx.c | 1 +
 drivers/net/iavf/iavf_rxtx.h | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index b1d0fbceb6..0db3aabd92 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -697,6 +697,7 @@ iavf_dev_rx_queue_setup(struct rte_eth_dev *dev, uint16_t queue_idx,
 
 	len = rte_pktmbuf_data_room_size(rxq->mp) - RTE_PKTMBUF_HEADROOM;
 	rxq->rx_buf_len = RTE_ALIGN_FLOOR(len, (1 << IAVF_RXQ_CTX_DBUFF_SHIFT));
+	rxq->rx_buf_len = RTE_MIN(rxq->rx_buf_len, IAVF_RX_MAX_DATA_BUF_SIZE);
 
 	/* Allocate the software ring. */
 	len = nb_desc + IAVF_RX_MAX_BURST;
diff --git a/drivers/net/iavf/iavf_rxtx.h b/drivers/net/iavf/iavf_rxtx.h
index 09e2127db0..f205a2aaf1 100644
--- a/drivers/net/iavf/iavf_rxtx.h
+++ b/drivers/net/iavf/iavf_rxtx.h
@@ -16,6 +16,9 @@
 /* used for Rx Bulk Allocate */
 #define IAVF_RX_MAX_BURST         32
 
+/* Max data buffer size must be 16K - 128 bytes */
+#define IAVF_RX_MAX_DATA_BUF_SIZE (16 * 1024 - 128)
+
 /* used for Vector PMD */
 #define IAVF_VPMD_RX_MAX_BURST    32
 #define IAVF_VPMD_TX_MAX_BURST    32
-- 
2.34.1