netdev - [PATCH net-next 00/13] bnxt_en: TX path improvements

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Date: Fri, 27 Oct 2023 16:22:39 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	gospo@...adcom.com
Subject: [PATCH net-next 00/13] bnxt_en: TX path improvements

All patches in this patchset are related to improving the TX path.
There are 2 areas of improvements:

1. The TX interrupt logic currently counts the number of TX completions
to determine the number of TX SKBs to free.  We now change it so that
the TX completion will now contain the hardware consumer index
information.  The driver will keep track of the latest hardware
consumer index from the last TX completion and clean up all TX SKBs
up to that index.  This scheme aligns better with future chips and
allows xmit_more code path to be more optimized.

2. The current driver logic requires an additional MSIX for each
additional MQPRIO TX ring.  This scheme uses too many MSIX vectors if
the user enables a large number of MQPRIO TCs.  We now use a new scheme
that will use the same MSIX for all the MQPRIO TX rings for each
ethtool channel.  Each ethtool TX channel can have up to 8 MQPRIO
TX rings and now they all will share the same MSIX.

Michael Chan (13):
  bnxt_en: Put the TX producer information in the TX BD opaque field
  bnxt_en: Add completion ring pointer in TX and RX ring structures
  bnxt_en: Restructure cp_ring_arr in struct bnxt_cp_ring_info
  bnxt_en: Add completion ring pointer in TX and RX ring structures
  bnxt_en: Remove BNXT_RX_HDL and BNXT_TX_HDL
  bnxt_en: Refactor bnxt_tx_int()
  bnxt_en: New encoding for the TX opaque field
  bnxt_en: Refactor bnxt_hwrm_set_coal()
  bnxt_en: Support up to 8 TX rings per MSIX
  bnxt_en: Add helper to get the number of CP rings required for TX
    rings
  bnxt_en: Add macros related to TC and TX rings
  bnxt_en: Use existing MSIX vectors for all mqprio TX rings
  bnxt_en: Optimize xmit_more TX path

 drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 513 +++++++++++-------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h     |  59 +-
 .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  11 +-
 drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c |  23 +-
 4 files changed, 385 insertions(+), 221 deletions(-)

-- 
2.30.1

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