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/* 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
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