netdev - [PATCH v1 0/1] Adjust macb max_tx

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Date:   Thu, 13 Apr 2023 19:03:36 +0100
From:   <daire.mcnamara@...rochip.com>
To:     <nicholas.ferre@...rochip.com>, <claudiu.beznea@...rochip.com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <conor.dooley@...rochip.com>
CC:     Daire McNamara <daire.mcnamara@...rochip.com>
Subject: [PATCH v1 0/1] Adjust macb max_tx_len for mpfs

From: Daire McNamara <daire.mcnamara@...rochip.com>

Several customers have reported unexpected ethernet issues whereby
the GEM stops transmitting and receiving. Performing an action such
as ifconfig <ethX> down; ifconfig <ethX> up clears this particular
condition.

The origin of the issue is a stream of AMBA_ERRORS (bit 6) from the
tx queues.

This patch sets the max_tx_length to SRAM size (16 KiB
in the case of mpfs) divided by num_queues (4 in the case of mpfs)
and then subtracts 56 bytes from that figure - resulting in max_tx_len
of 4040.  The max jumbo length is also set to 4040.  These figures
are derived from Cadence erratum 1686.

Daire McNamara (1):
  net: macb: Shorten max_tx_len to 4KiB - 56 on mpfs

 drivers/net/ethernet/cadence/macb.h      |  1 +
 drivers/net/ethernet/cadence/macb_main.c | 16 ++++++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

base-commit: 7a124d3a4a346563967b8887882858e5ef46f030
prerequisite-patch-id: 08908afdfe3b919f92560dd4306178c5f3f588dd
-- 
2.25.1