[PATCH v2 02/10] net/txgbe: fix Rx buffer size in configure register

[Jiawen Wu]

When round up buffer size to 1K, to configure the register, hardware will
receive packets exceeding the buffer size in LRO mode. It will cause a
segment fault in the receive function.

Fixes: be797cbf4582 ("net/txgbe: add Rx and Tx init")
Cc: sta...@dpdk.org

Signed-off-by: Jiawen Wu <jiawe...@trustnetic.com>
---
 drivers/net/txgbe/txgbe_rxtx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/txgbe/txgbe_rxtx.c b/drivers/net/txgbe/txgbe_rxtx.c
index ac1bba08a3..328406908d 100644
--- a/drivers/net/txgbe/txgbe_rxtx.c
+++ b/drivers/net/txgbe/txgbe_rxtx.c
@@ -4382,7 +4382,10 @@ txgbe_dev_rx_init(struct rte_eth_dev *dev)
                 */
                buf_size = (uint16_t)(rte_pktmbuf_data_room_size(rxq->mb_pool) -
                        RTE_PKTMBUF_HEADROOM);
-               buf_size = ROUND_UP(buf_size, 0x1 << 10);
+               if (buf_size < 1024)
+                       buf_size = ROUND_UP(buf_size, 0x1 << 10);
+               else
+                       buf_size = ROUND_DOWN(buf_size, 0x1 << 10);
                srrctl |= TXGBE_RXCFG_PKTLEN(buf_size);
 
                wr32(hw, TXGBE_RXCFG(rxq->reg_idx), srrctl);
-- 
2.27.0