octeontx2-pf: Reuse PF max mtu value

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 <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Geetha sowjanya

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))

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 */

drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c

@@ -3101,6 +3101,7 @@ 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);

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)) {