net/e1000: fix max Rx packet size
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Commit Message
According to E1000_ETH_OVERHEAD definition, max_rx_pkt_len contains
one VLAN tag size. Therefor when config RLPML register, if dual VLAN
not enabled there is no need to add VLAN tag size to max_rx_pkt_len,
otherwise only one another VLAN tag size should be added to.
Fixes: e51abef39382 ("igb: fix max RX packet size and support dual VLAN")
Cc: stable@dpdk.org
Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
---
drivers/net/e1000/igb_ethdev.c | 5 ++---
drivers/net/e1000/igb_rxtx.c | 9 ++++++---
2 files changed, 8 insertions(+), 6 deletions(-)
@@ -2688,8 +2688,7 @@ static int eth_igbvf_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
/* Update maximum packet length */
if (dev->data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME)
E1000_WRITE_REG(hw, E1000_RLPML,
- dev->data->dev_conf.rxmode.max_rx_pkt_len +
- VLAN_TAG_SIZE);
+ dev->data->dev_conf.rxmode.max_rx_pkt_len);
}
static void
@@ -2708,7 +2707,7 @@ static int eth_igbvf_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
if (dev->data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME)
E1000_WRITE_REG(hw, E1000_RLPML,
dev->data->dev_conf.rxmode.max_rx_pkt_len +
- 2 * VLAN_TAG_SIZE);
+ VLAN_TAG_SIZE);
}
static int
@@ -2343,15 +2343,18 @@ int eth_igb_rss_hash_conf_get(struct rte_eth_dev *dev,
* Configure support of jumbo frames, if any.
*/
if (dev->data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) {
+ uint32_t max_len = dev->data->dev_conf.rxmode.max_rx_pkt_len;
+
rctl |= E1000_RCTL_LPE;
/*
* Set maximum packet length by default, and might be updated
* together with enabling/disabling dual VLAN.
*/
- E1000_WRITE_REG(hw, E1000_RLPML,
- dev->data->dev_conf.rxmode.max_rx_pkt_len +
- VLAN_TAG_SIZE);
+ if (rxmode->offloads & DEV_RX_OFFLOAD_VLAN_EXTEND)
+ max_len += VLAN_TAG_SIZE;
+
+ E1000_WRITE_REG(hw, E1000_RLPML, max_len);
} else
rctl &= ~E1000_RCTL_LPE;