netdev - [PATCH v22 18/25] sfc: get endpoint decoder

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Message-ID: <20251205115248.772945-19-alejandro.lucero-palau@amd.com>
Date: Fri, 5 Dec 2025 11:52:41 +0000
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <edward.cree@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<dave.jiang@...el.com>
CC: Alejandro Lucero <alucerop@....com>, Martin Habets
	<habetsm.xilinx@...il.com>, Edward Cree <ecree.xilinx@...il.com>, "Jonathan
 Cameron" <Jonathan.Cameron@...wei.com>, Ben Cheatham
	<benjamin.cheatham@....com>
Subject: [PATCH v22 18/25] sfc: get endpoint decoder

From: Alejandro Lucero <alucerop@....com>

Use cxl api for getting DPA (Device Physical Address) to use through an
endpoint decoder.

Signed-off-by: Alejandro Lucero <alucerop@....com>
Reviewed-by: Martin Habets <habetsm.xilinx@...il.com>
Acked-by: Edward Cree <ecree.xilinx@...il.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@....com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
---
 drivers/net/ethernet/sfc/efx_cxl.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index d0e907034960..56e7104483a5 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -128,6 +128,14 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 			cxl_put_root_decoder(cxl->cxlrd);
 			return -ENOSPC;
 		}
+
+		cxl->cxled = cxl_request_dpa(cxl->cxlmd, CXL_PARTMODE_RAM,
+					     EFX_CTPIO_BUFFER_SIZE);
+		if (IS_ERR(cxl->cxled)) {
+			pci_err(pci_dev, "CXL accel request DPA failed");
+			cxl_put_root_decoder(cxl->cxlrd);
+			return PTR_ERR(cxl->cxled);
+		}
 	}
 
 	probe_data->cxl = cxl;
@@ -146,6 +154,7 @@ void efx_cxl_exit(struct efx_probe_data *probe_data)
 				   DETACH_INVALIDATE);
 		unregister_region(probe_data->cxl->efx_region);
 	} else {
+		cxl_dpa_free(probe_data->cxl->cxled);
 		cxl_put_root_decoder(probe_data->cxl->cxlrd);
 	}
 }
-- 
2.34.1