bnxt_en: Set TSO max segs on devices with limits

JIRA: https://issues.redhat.com/browse/RHEL-19811
JIRA: https://issues.redhat.com/browse/RHEL-23120
JIRA: https://issues.redhat.com/browse/RHEL-25505

commit b7bfcb4
Author: Michael Chan <michael.chan@broadcom.com>
Date:   Tue Jun 18 14:53:12 2024 -0700

    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 <ajit.khaparde@broadcom.com>
    Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
    Signed-off-by: Michael Chan <michael.chan@broadcom.com>
    Link: https://lore.kernel.org/r/20240618215313.29631-3-michael.chan@broadcom.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Ken Cox <jkc@redhat.com>

Author: Ken Cox

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

@@ -8340,6 +8340,7 @@ 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);
@@ -14299,6 +14300,8 @@ 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

@@ -2165,6 +2165,7 @@ struct bnxt {
 #define BNXT_RSS_CAP_RSS_TCAM			BIT(3)
 
 	u16			max_mtu;
+	u16			tso_max_segs;
 	u8			max_tc;
 	u8			max_lltc;	/* lossless TCs */
 	struct bnxt_queue_info	q_info[BNXT_MAX_QUEUE];