netdev - [PATCH v18 12/20] sfc: get endpoint decoder

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Message-ID: <20250918091746.2034285-13-alejandro.lucero-palau@amd.com>
Date: Thu, 18 Sep 2025 10:17:38 +0100
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>
Subject: [PATCH v18 12/20] 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>
---
 drivers/net/ethernet/sfc/efx_cxl.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index d29594e71027..4461b7a4dc2c 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -99,16 +99,23 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 
 	if (IS_ERR(cxl->cxlrd)) {
 		pci_err(pci_dev, "cxl_get_hpa_freespace failed\n");
-		cxl_release_endpoint(cxl->cxlmd, cxl->endpoint);
-		return PTR_ERR(cxl->cxlrd);
+		rc = PTR_ERR(cxl->cxlrd);
+		goto err_release;
 	}
 
 	if (max_size < EFX_CTPIO_BUFFER_SIZE) {
 		pci_err(pci_dev, "%s: not enough free HPA space %pap < %u\n",
 			__func__, &max_size, EFX_CTPIO_BUFFER_SIZE);
-		cxl_put_root_decoder(cxl->cxlrd);
-		cxl_release_endpoint(cxl->cxlmd, cxl->endpoint);
-		return -ENOSPC;
+		rc = -ENOSPC;
+		goto err_decoder;
+	}
+
+	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");
+		rc = PTR_ERR(cxl->cxled);
+		goto err_decoder;
 	}
 
 	probe_data->cxl = cxl;
@@ -116,12 +123,21 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 	cxl_release_endpoint(cxl->cxlmd, cxl->endpoint);
 
 	return 0;
+
+err_decoder:
+	cxl_put_root_decoder(cxl->cxlrd);
+err_release:
+	cxl_release_endpoint(cxl->cxlmd, cxl->endpoint);
+
+	return rc;
 }
 
 void efx_cxl_exit(struct efx_probe_data *probe_data)
 {
-	if (probe_data->cxl)
+	if (probe_data->cxl) {
+		cxl_dpa_free(probe_data->cxl->cxled);
 		cxl_put_root_decoder(probe_data->cxl->cxlrd);
+	}
 }
 
 MODULE_IMPORT_NS("CXL");
-- 
2.34.1