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87550ba2dc
Update __bnxt_tx_int and bnxt_free_one_tx_ring_skbs to handle SW GSO segments: - MID segments: adjust tx_pkts/tx_bytes accounting and skip skb free (the skb is shared across all segments and freed only once) - LAST segments: call tso_dma_map_complete() to tear down the IOVA mapping if one was used. On the fallback path, payload DMA unmapping is handled by the existing per-BD dma_unmap_len walk. Both MID and LAST completions advance tx_inline_cons to release the segment's inline header slot back to the ring. is_sw_gso is initialized to zero, so the new code paths are not run. Add logic for feature advertisement and guardrails for ring sizing. Suggested-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com> Signed-off-by: Joe Damato <joe@dama.to> Link: https://patch.msgid.link/20260408230607.2019402-9-joe@dama.to Signed-off-by: Jakub Kicinski <kuba@kernel.org>
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Broadcom NetXtreme-C/E network driver.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#ifndef BNXT_GSO_H
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#define BNXT_GSO_H
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/* Maximum segments the stack may send in a single SW USO skb.
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* This caps gso_max_segs for NICs without HW USO support.
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*/
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#define BNXT_SW_USO_MAX_SEGS 64
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/* Worst-case TX descriptors consumed by one SW USO packet:
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* Each segment: 1 long BD + 1 ext BD + payload BDs.
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* Total payload BDs across all segs <= num_segs + nr_frags (each frag
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* boundary crossing adds at most 1 extra BD).
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* So: 3 * max_segs + MAX_SKB_FRAGS + 1 = 3 * 64 + 17 + 1 = 210.
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*/
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#define BNXT_SW_USO_MAX_DESCS (3 * BNXT_SW_USO_MAX_SEGS + MAX_SKB_FRAGS + 1)
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static inline u16 bnxt_inline_avail(struct bnxt_tx_ring_info *txr)
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{
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return BNXT_SW_USO_MAX_SEGS -
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(u16)(txr->tx_inline_prod - READ_ONCE(txr->tx_inline_cons));
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}
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static inline int bnxt_min_tx_desc_cnt(struct bnxt *bp,
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netdev_features_t features)
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{
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if (!(bp->flags & BNXT_FLAG_UDP_GSO_CAP) &&
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(features & NETIF_F_GSO_UDP_L4))
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return BNXT_SW_USO_MAX_DESCS;
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return BNXT_MIN_TX_DESC_CNT;
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}
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netdev_tx_t bnxt_sw_udp_gso_xmit(struct bnxt *bp,
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struct bnxt_tx_ring_info *txr,
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struct netdev_queue *txq,
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struct sk_buff *skb);
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#endif
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