From: Joe Damato Date: Wed, 8 Apr 2026 23:05:55 +0000 (-0700) Subject: net: bnxt: Add boilerplate GSO code X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0440e27eedace1c96b46b67d5607348bb07281ec;p=thirdparty%2Fkernel%2Flinux.git net: bnxt: Add boilerplate GSO code Add bnxt_gso.c and bnxt_gso.h with a stub bnxt_sw_udp_gso_xmit() function, SW USO constants (BNXT_SW_USO_MAX_SEGS, BNXT_SW_USO_MAX_DESCS), and the is_sw_gso field in bnxt_sw_tx_bd with BNXT_SW_GSO_MID/LAST markers. The full SW USO implementation will be added in a future commit. Suggested-by: Jakub Kicinski Reviewed-by: Pavan Chebbi Signed-off-by: Joe Damato Link: https://patch.msgid.link/20260408230607.2019402-7-joe@dama.to Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/broadcom/bnxt/Makefile b/drivers/net/ethernet/broadcom/bnxt/Makefile index ba6c239d52fa..debef78c8b6d 100644 --- a/drivers/net/ethernet/broadcom/bnxt/Makefile +++ b/drivers/net/ethernet/broadcom/bnxt/Makefile @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_BNXT) += bnxt_en.o -bnxt_en-y := bnxt.o bnxt_hwrm.o bnxt_sriov.o bnxt_ethtool.o bnxt_dcb.o bnxt_ulp.o bnxt_xdp.o bnxt_ptp.o bnxt_vfr.o bnxt_devlink.o bnxt_dim.o bnxt_coredump.o +bnxt_en-y := bnxt.o bnxt_hwrm.o bnxt_sriov.o bnxt_ethtool.o bnxt_dcb.o bnxt_ulp.o bnxt_xdp.o bnxt_ptp.o bnxt_vfr.o bnxt_devlink.o bnxt_dim.o bnxt_coredump.o bnxt_gso.o bnxt_en-$(CONFIG_BNXT_FLOWER_OFFLOAD) += bnxt_tc.o bnxt_en-$(CONFIG_DEBUG_FS) += bnxt_debugfs.o bnxt_en-$(CONFIG_BNXT_HWMON) += bnxt_hwmon.o diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index d98a58aa30f6..6b38b84924e0 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -892,6 +892,7 @@ struct bnxt_sw_tx_bd { struct page *page; u8 is_ts_pkt; u8 is_push; + u8 is_sw_gso; u8 action; unsigned short nr_frags; union { @@ -900,6 +901,9 @@ struct bnxt_sw_tx_bd { }; }; +#define BNXT_SW_GSO_MID 1 +#define BNXT_SW_GSO_LAST 2 + struct bnxt_sw_rx_bd { void *data; u8 *data_ptr; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_gso.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_gso.c new file mode 100644 index 000000000000..b296769ee4fe --- /dev/null +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_gso.c @@ -0,0 +1,30 @@ +// 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "bnxt.h" +#include "bnxt_gso.h" + +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) +{ + dev_kfree_skb_any(skb); + dev_core_stats_tx_dropped_inc(bp->dev); + return NETDEV_TX_OK; +} diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_gso.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_gso.h new file mode 100644 index 000000000000..f01e8102dcd7 --- /dev/null +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_gso.h @@ -0,0 +1,31 @@ +/* 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) + +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