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From 19a1808003af3e87f903a053b2207a59f6bb3456 Mon Sep 17 00:00:00 2001
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From: Ajit Khaparde <ajit.khaparde@broadcom.com>
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Date: Thu, 28 Jun 2018 13:15:43 -0700
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Subject: [PATCH] net/bnxt: fix set MTU
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There is no need to update bnxt_hwrm_vnic_plcmode_cfg if new MTU is
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not greater than the max data the mbuf can accommodate.
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Fixes: daef48efe5e5 ("net/bnxt: support set MTU")
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Cc: stable@dpdk.org
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Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
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(cherry picked from commit 42e4af421e80ee4a07730a83fd9a7a6b9a1fbe26)
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---
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drivers/net/bnxt/bnxt_ethdev.c | 12 +++++++++---
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1 file changed, 9 insertions(+), 3 deletions(-)
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diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
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index 9a6209d6c..775b99cab 100644
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--- a/drivers/net/bnxt/bnxt_ethdev.c
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+++ b/drivers/net/bnxt/bnxt_ethdev.c
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@@ -1537,6 +1537,7 @@ static int bnxt_mtu_set_op(struct rte_eth_dev *eth_dev, uint16_t new_mtu)
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for (i = 0; i < bp->nr_vnics; i++) {
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struct bnxt_vnic_info *vnic = &bp->vnic_info[i];
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+ uint16_t size = 0;
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vnic->mru = bp->eth_dev->data->mtu + ETHER_HDR_LEN +
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ETHER_CRC_LEN + VLAN_TAG_SIZE * 2;
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@@ -1544,9 +1545,14 @@ static int bnxt_mtu_set_op(struct rte_eth_dev *eth_dev, uint16_t new_mtu)
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if (rc)
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break;
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- rc = bnxt_hwrm_vnic_plcmode_cfg(bp, vnic);
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- if (rc)
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- return rc;
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+ size = rte_pktmbuf_data_room_size(bp->rx_queues[0]->mb_pool);
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+ size -= RTE_PKTMBUF_HEADROOM;
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+
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+ if (size < new_mtu) {
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+ rc = bnxt_hwrm_vnic_plcmode_cfg(bp, vnic);
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+ if (rc)
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+ return rc;
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+ }
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}
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return rc;
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--
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2.17.1
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