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net: bnxt: Add boilerplate GSO code

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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 <kuba@kernel.org>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260408230607.2019402-7-joe@dama.to
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Joe Damato 2026-04-08 16:05:55 -07:00 committed by Jakub Kicinski
parent 0c26a0e765
commit 0440e27eed
4 changed files with 66 additions and 1 deletions
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2
drivers/net/ethernet/broadcom/bnxt/Makefile
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@ -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

4
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View File

@ -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;

30
drivers/net/ethernet/broadcom/bnxt/bnxt_gso.c Normal file
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@ -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 <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/netdev_queues.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/udp.h>
#include <net/tso.h>
#include <linux/bnxt/hsi.h>
#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;
}

31
drivers/net/ethernet/broadcom/bnxt/bnxt_gso.h Normal file
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@ -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