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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: linux-kernel@vger.kernel.org, Joe Damato Subject: [RFC net-next v2 06/12] net: bnxt: Add TX inline buffer infrastructure Date: Thu, 12 Mar 2026 15:34:43 -0700 Message-ID: <20260312223457.1999489-7-joe@dama.to> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260312223457.1999489-1-joe@dama.to> References: <20260312223457.1999489-1-joe@dama.to> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add per-ring pre-allocated inline buffer fields (tx_inline_buf, tx_inline_dma, tx_inline_size) to bnxt_tx_ring_info and helpers to allocate and free them. A producer and consumer (tx_inline_prod, tx_inline_cons) are added to track which slot(s) of the inline buffer are in-use. The inline buffer will be used by the SW USO path for pre-allocated, pre-DMA-mapped per-segment header copies. In the future, this could be extended to support TX copybreak. Allocation helper is marked __maybe_unused in this commit because it will be wired in later. Suggested-by: Jakub Kicinski Signed-off-by: Joe Damato --- rfcv2: - Added a producer and consumer to correctly track the in use header slo= ts. drivers/net/ethernet/broadcom/bnxt/bnxt.c | 35 +++++++++++++++++++++++ drivers/net/ethernet/broadcom/bnxt/bnxt.h | 6 ++++ 2 files changed, 41 insertions(+) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethern= et/broadcom/bnxt/bnxt.c index ea8081aeb5ae..8929264a54b1 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -3983,6 +3983,39 @@ static int bnxt_alloc_rx_rings(struct bnxt *bp) return rc; } =20 +static void bnxt_free_tx_inline_buf(struct bnxt_tx_ring_info *txr, + struct pci_dev *pdev) +{ + if (!txr->tx_inline_buf) + return; + + dma_unmap_single(&pdev->dev, txr->tx_inline_dma, + txr->tx_inline_size, DMA_TO_DEVICE); + kfree(txr->tx_inline_buf); + txr->tx_inline_buf =3D NULL; + txr->tx_inline_size =3D 0; +} + +static int __maybe_unused bnxt_alloc_tx_inline_buf(struct bnxt_tx_ring_inf= o *txr, + struct pci_dev *pdev, + unsigned int size) +{ + txr->tx_inline_buf =3D kmalloc(size, GFP_KERNEL); + if (!txr->tx_inline_buf) + return -ENOMEM; + + txr->tx_inline_dma =3D dma_map_single(&pdev->dev, txr->tx_inline_buf, + size, DMA_TO_DEVICE); + if (dma_mapping_error(&pdev->dev, txr->tx_inline_dma)) { + kfree(txr->tx_inline_buf); + txr->tx_inline_buf =3D NULL; + return -ENOMEM; + } + txr->tx_inline_size =3D size; + + return 0; +} + static void bnxt_free_tx_rings(struct bnxt *bp) { int i; @@ -4001,6 +4034,8 @@ static void bnxt_free_tx_rings(struct bnxt *bp) txr->tx_push =3D NULL; } =20 + bnxt_free_tx_inline_buf(txr, pdev); + ring =3D &txr->tx_ring_struct; =20 bnxt_free_ring(bp, &ring->ring_mem); diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethern= et/broadcom/bnxt/bnxt.h index a822bbb71146..d9543d6048d8 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -994,6 +994,12 @@ struct bnxt_tx_ring_info { dma_addr_t tx_push_mapping; __le64 data_mapping; =20 + void *tx_inline_buf; + dma_addr_t tx_inline_dma; + unsigned int tx_inline_size; + u16 tx_inline_prod; + u16 tx_inline_cons; + #define BNXT_DEV_STATE_CLOSING 0x1 u32 dev_state; =20 --=20 2.52.0