bnxt_en: Set TSO max segs on devices with limits

Firmware will now advertise a non-zero TSO max segments if the
device has a limit.  0 means no limit.  The latest 5760X chip
(early revs) has a limit of 2047 that cannot be exceeded.  If
exceeded, the chip will send out just a small number of segments.

Call netif_set_tso_max_segs() if the device has a limit.

Fixes: 2012a6a ("bnxt_en: Add 5760X (P7) PCI IDs")
Reviewed-by: Ajit Khaparde <[email protected]>
Reviewed-by: Somnath Kotur <[email protected]>
Signed-off-by: Michael Chan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Michael Chan

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -8996,6 +8996,7 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		memcpy(vf->mac_addr, resp->mac_address, ETH_ALEN);
 #endif
 	}
+	bp->tso_max_segs = le16_to_cpu(resp->max_tso_segs);
 
 hwrm_func_qcaps_exit:
 	hwrm_req_drop(bp, req);
@@ -15363,6 +15364,8 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	dev->priv_flags |= IFF_UNICAST_FLT;
 
 	netif_set_tso_max_size(dev, GSO_MAX_SIZE);
+	if (bp->tso_max_segs)
+		netif_set_tso_max_segs(dev, bp->tso_max_segs);
 
 	dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT |
 			    NETDEV_XDP_ACT_RX_SG;

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -2318,6 +2318,7 @@ struct bnxt {
 	u8			rss_hash_key_updated:1;
 
 	u16			max_mtu;
+	u16			tso_max_segs;
 	u8			max_tc;
 	u8			max_lltc;	/* lossless TCs */
 	struct bnxt_queue_info	q_info[BNXT_MAX_QUEUE];