[net-next PATCH v3 3/4] octeontx2-pf: Reuse PF max mtu value

From: Geetha sowjanya
Date: Thu Sep 12 2024 - 02:42:21 EST


Reuse the maximum support HW MTU value that is fetch during probe.
Instead of fetching through mbox each time mtu is changed as the
value is fixed for interface.

Signed-off-by: Geetha sowjanya <gakula@xxxxxxxxxxx>
---
drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c | 4 ++--
drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h | 1 +
drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c | 1 +
drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c | 1 +
4 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index 87d5776e3b88..34e76cfd941b 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -227,7 +227,7 @@ int otx2_hw_set_mtu(struct otx2_nic *pfvf, int mtu)
u16 maxlen;
int err;

- maxlen = otx2_get_max_mtu(pfvf) + OTX2_ETH_HLEN + OTX2_HW_TIMESTAMP_LEN;
+ maxlen = pfvf->hw.max_mtu + OTX2_ETH_HLEN + OTX2_HW_TIMESTAMP_LEN;

mutex_lock(&pfvf->mbox.lock);
req = otx2_mbox_alloc_msg_nix_set_hw_frs(&pfvf->mbox);
@@ -236,7 +236,7 @@ int otx2_hw_set_mtu(struct otx2_nic *pfvf, int mtu)
return -ENOMEM;
}

- req->maxlen = pfvf->netdev->mtu + OTX2_ETH_HLEN + OTX2_HW_TIMESTAMP_LEN;
+ req->maxlen = mtu + OTX2_ETH_HLEN + OTX2_HW_TIMESTAMP_LEN;

/* Use max receive length supported by hardware for loopback devices */
if (is_otx2_lbkvf(pfvf->pdev))
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index df548aeffecf..b36b87dae2cb 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -228,6 +228,7 @@ struct otx2_hw {
u16 txschq_list[NIX_TXSCH_LVL_CNT][MAX_TXSCHQ_PER_FUNC];
u16 matchall_ipolicer;
u32 dwrr_mtu;
+ u32 max_mtu;
u8 smq_link_type;

/* HW settings, coalescing etc */
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index b7082a154c34..962583277f7b 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -3104,6 +3104,7 @@ static int otx2_probe(struct pci_dev *pdev, const struct pci_device_id *id)

netdev->min_mtu = OTX2_MIN_MTU;
netdev->max_mtu = otx2_get_max_mtu(pf);
+ hw->max_mtu = netdev->max_mtu;

/* reset CGX/RPM MAC stats */
otx2_reset_mac_stats(pf);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
index 99fcc5661674..79a8acac6283 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
@@ -671,6 +671,7 @@ static int otx2vf_probe(struct pci_dev *pdev, const struct pci_device_id *id)

netdev->min_mtu = OTX2_MIN_MTU;
netdev->max_mtu = otx2_get_max_mtu(vf);
+ hw->max_mtu = netdev->max_mtu;

/* To distinguish, for LBK VFs set netdev name explicitly */
if (is_otx2_lbkvf(vf->pdev)) {
--
2.25.1