netdev - Re: [PATCH net-next v5 3/6] net: tn40xx: add basic Tx handling

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Date: Wed, 8 May 2024 19:46:05 +0200
From: Hans-Frieder Vogt <hfdevel@....net>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: netdev@...r.kernel.org, andrew@...n.ch, horms@...nel.org,
 kuba@...nel.org, jiri@...nulli.us, pabeni@...hat.com
Subject: Re: [PATCH net-next v5 3/6] net: tn40xx: add basic Tx handling

 > This patch adds device specific structures to initialize the hardware
 > with basic Tx handling. The original driver loads the embedded
 > firmware in the header file. This driver is implemented to use the
 > firmware APIs.
 >
 > The Tx logic uses three major data structures; two ring buffers with
 > NIC and one database. One ring buffer is used to send information
 > about packets to be sent for NIC. The other is used to get information
 > from NIC about packet that are sent. The database is used to keep the
 > information about DMA mapping. After a packet is sent, the db is used
 > to free the resource used for the packet.
 >
 > Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
 > ---
 >  drivers/net/ethernet/tehuti/Kconfig |    1 +
 >  drivers/net/ethernet/tehuti/tn40.c  | 1260 +++++++++++++++++++++++++++
 >  drivers/net/ethernet/tehuti/tn40.h  |  167 ++++
 >  3 files changed, 1428 insertions(+)
 >
 > diff --git a/drivers/net/ethernet/tehuti/Kconfig
b/drivers/net/ethernet/tehuti/Kconfig
 > index 849e3b4a71c1..4198fd59e42e 100644
 > --- a/drivers/net/ethernet/tehuti/Kconfig
 > +++ b/drivers/net/ethernet/tehuti/Kconfig
 > @@ -26,6 +26,7 @@ config TEHUTI
 >  config TEHUTI_TN40
 >      tristate "Tehuti Networks TN40xx 10G Ethernet adapters"
 >      depends on PCI
 > +    select FW_LOADER
 >      help
 >        This driver supports 10G Ethernet adapters using Tehuti Networks
 >        TN40xx chips. Currently, adapters with Applied Micro Circuits
 > diff --git a/drivers/net/ethernet/tehuti/tn40.c
b/drivers/net/ethernet/tehuti/tn40.c
 > index 6ec436120d18..6c6163bad2c2 100644
 > --- a/drivers/net/ethernet/tehuti/tn40.c
 > +++ b/drivers/net/ethernet/tehuti/tn40.c
 > @@ -1,14 +1,1186 @@
 >  // SPDX-License-Identifier: GPL-2.0+
 >  /* Copyright (c) Tehuti Networks Ltd. */
 >
 > +#include <linux/bitfield.h>
 > +#include <linux/ethtool.h>
 > +#include <linux/firmware.h>
 > +#include <linux/if_vlan.h>
 > +#include <linux/netdevice.h>
 >  #include <linux/pci.h>
 >
 >  #include "tn40.h"
 >
 > +#define TN40_SHORT_PACKET_SIZE 60
 > +#define TN40_FIRMWARE_NAME "tn40xx-14.fw"

why is here a new firmware name defined?
The TN4010 uses the identical firmware as the tehuti ethernet driver. I
suggest therefore to define instead, in order to avoid storing the same
firmware twice:

#define TN40_FIRMWARE_NAME "tehuti/bdx.bin"

--
Best regards,

Hans