/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Broadcom NetXtreme-C/E network driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 */

#ifndef BNXT_GSO_H
#define BNXT_GSO_H

/* Maximum segments the stack may send in a single SW USO skb.
 * This caps gso_max_segs for NICs without HW USO support.
 */
#define BNXT_SW_USO_MAX_SEGS    64

/* Worst-case TX descriptors consumed by one SW USO packet:
 * Each segment: 1 long BD + 1 ext BD + payload BDs.
 * Total payload BDs across all segs <= num_segs + nr_frags (each frag
 * boundary crossing adds at most 1 extra BD).
 * So: 3 * max_segs + MAX_SKB_FRAGS + 1 = 3 * 64 + 17 + 1 = 210.
 */
#define BNXT_SW_USO_MAX_DESCS   (3 * BNXT_SW_USO_MAX_SEGS + MAX_SKB_FRAGS + 1)

static inline u16 bnxt_inline_avail(struct bnxt_tx_ring_info *txr)
{
        return BNXT_SW_USO_MAX_SEGS -
               (u16)(txr->tx_inline_prod - READ_ONCE(txr->tx_inline_cons));
}

static inline int bnxt_min_tx_desc_cnt(struct bnxt *bp,
                                       netdev_features_t features)
{
        if (!(bp->flags & BNXT_FLAG_UDP_GSO_CAP) &&
            (features & NETIF_F_GSO_UDP_L4))
                return BNXT_SW_USO_MAX_DESCS;
        return BNXT_MIN_TX_DESC_CNT;
}

netdev_tx_t bnxt_sw_udp_gso_xmit(struct bnxt *bp,
                                 struct bnxt_tx_ring_info *txr,
                                 struct netdev_queue *txq,
                                 struct sk_buff *skb);

#endif