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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , Simon Horman , Ilias Apalodimas , Mina Almasry , Pavel Begunkov , Willem de Bruijn , Dragos Tatulea , Saeed Mahameed , Tariq Toukan , Mark Bloch , David Wei , linux-kernel@vger.kernel.org Subject: [PATCH net-next v5 6/6] eth: bnxt: allow providers to set rx buf size Date: Tue, 14 Oct 2025 14:01:26 +0100 Message-ID: X-Mailer: git-send-email 2.49.0 In-Reply-To: References: 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" Implement NDO_QUEUE_RX_BUF_SIZE and take the rx buf size from the memory providers. Signed-off-by: Pavel Begunkov --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 34 +++++++++++++++++++++++ drivers/net/ethernet/broadcom/bnxt/bnxt.h | 1 + 2 files changed, 35 insertions(+) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethern= et/broadcom/bnxt/bnxt.c index 950e60d204cb..8d0e69dc900e 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -15906,16 +15906,46 @@ static const struct netdev_stat_ops bnxt_stat_ops= =3D { .get_base_stats =3D bnxt_get_base_stats, }; =20 +static ssize_t bnxt_get_rx_buf_size(struct bnxt *bp, int rxq_idx) +{ + struct netdev_rx_queue *rxq =3D __netif_get_rx_queue(bp->dev, rxq_idx); + size_t rx_buf_size; + + rx_buf_size =3D rxq->mp_params.rx_buf_len; + if (!rx_buf_size) + return BNXT_RX_PAGE_SIZE; + + /* Older chips need MSS calc so rx_buf_len is not supported, + * but we don't set queue ops for them so we should never get here. + */ + if (!(bp->flags & BNXT_FLAG_CHIP_P5_PLUS)) + return -EINVAL; + + if (!is_power_of_2(rx_buf_size)) + return -ERANGE; + + if (rx_buf_size < BNXT_RX_PAGE_SIZE || + rx_buf_size > BNXT_MAX_RX_PAGE_SIZE) + return -ERANGE; + + return rx_buf_size; +} + static int bnxt_queue_mem_alloc(struct net_device *dev, void *qmem, int id= x) { struct bnxt_rx_ring_info *rxr, *clone; struct bnxt *bp =3D netdev_priv(dev); struct bnxt_ring_struct *ring; + ssize_t rx_buf_size; int rc; =20 if (!bp->rx_ring) return -ENETDOWN; =20 + rx_buf_size =3D bnxt_get_rx_buf_size(bp, idx); + if (rx_buf_size < 0) + return rx_buf_size; + rxr =3D &bp->rx_ring[idx]; clone =3D qmem; memcpy(clone, rxr, sizeof(*rxr)); @@ -15927,6 +15957,7 @@ static int bnxt_queue_mem_alloc(struct net_device *= dev, void *qmem, int idx) clone->rx_sw_agg_prod =3D 0; clone->rx_next_cons =3D 0; clone->need_head_pool =3D false; + clone->rx_page_size =3D rx_buf_size; =20 rc =3D bnxt_alloc_rx_page_pool(bp, clone, rxr->page_pool->p.nid); if (rc) @@ -16053,6 +16084,8 @@ static void bnxt_copy_rx_ring(struct bnxt *bp, src_ring =3D &src->rx_agg_ring_struct; src_rmem =3D &src_ring->ring_mem; =20 + dst->rx_page_size =3D src->rx_page_size; + WARN_ON(dst_rmem->nr_pages !=3D src_rmem->nr_pages); WARN_ON(dst_rmem->page_size !=3D src_rmem->page_size); WARN_ON(dst_rmem->flags !=3D src_rmem->flags); @@ -16205,6 +16238,7 @@ static const struct netdev_queue_mgmt_ops bnxt_queu= e_mgmt_ops =3D { .ndo_queue_mem_free =3D bnxt_queue_mem_free, .ndo_queue_start =3D bnxt_queue_start, .ndo_queue_stop =3D bnxt_queue_stop, + .supported_params =3D NDO_QUEUE_RX_BUF_SIZE, }; =20 static void bnxt_remove_one(struct pci_dev *pdev) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethern= et/broadcom/bnxt/bnxt.h index 3a53d9073c4d..d84c0de231b3 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -759,6 +759,7 @@ struct nqe_cn { #endif =20 #define BNXT_RX_PAGE_SIZE (1 << BNXT_RX_PAGE_SHIFT) +#define BNXT_MAX_RX_PAGE_SIZE (1 << 15) =20 #define BNXT_MAX_MTU 9500 =20 --=20 2.49.0