RDMA/efa: Report host information to the device

The host info feature allows the driver to infrom the EFA device
firmware with system configuration for debugging and troubleshooting
purposes.

The host info buffer is passed as an admin command DMA mapped control
buffer, and is unmapped and freed once the command CQE is consumed.

Currently, the setting of host info is done for each device on its
probe. Failing to set the host info for the device shall not disturb the
probe flow, any errors will be discarded.

Link: https://lore.kernel.org/r/20200512152204.93091-3-galpress@amazon.com
Reviewed-by: Firas JahJah <firasj@amazon.com>
Reviewed-by: Guy Tzalik <gtzalik@amazon.com>
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 51 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/efa/efa_main.c b/drivers/infiniband/hw/efa/efa_main.c
index faf3ff1bca2a..82145574c928 100644
--- a/drivers/infiniband/hw/efa/efa_main.c
+++ b/drivers/infiniband/hw/efa/efa_main.c
@@ -1,10 +1,12 @@
 // SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
 /*
- * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All rights reserved.
+ * Copyright 2018-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
  */
 
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/utsname.h>
+#include <linux/version.h>
 
 #include <rdma/ib_user_verbs.h>
 
@@ -187,6 +189,52 @@ static void efa_stats_init(struct efa_dev *dev)
 		atomic64_set(s, 0);
 }
 
+static void efa_set_host_info(struct efa_dev *dev)
+{
+	struct efa_admin_set_feature_resp resp = {};
+	struct efa_admin_set_feature_cmd cmd = {};
+	struct efa_admin_host_info *hinf;
+	u32 bufsz = sizeof(*hinf);
+	dma_addr_t hinf_dma;
+
+	if (!efa_com_check_supported_feature_id(&dev->edev,
+						EFA_ADMIN_HOST_INFO))
+		return;
+
+	/* Failures in host info set shall not disturb probe */
+	hinf = dma_alloc_coherent(&dev->pdev->dev, bufsz, &hinf_dma,
+				  GFP_KERNEL);
+	if (!hinf)
+		return;
+
+	strlcpy(hinf->os_dist_str, utsname()->release,
+		min(sizeof(hinf->os_dist_str), sizeof(utsname()->release)));
+	hinf->os_type = EFA_ADMIN_OS_LINUX;
+	strlcpy(hinf->kernel_ver_str, utsname()->version,
+		min(sizeof(hinf->kernel_ver_str), sizeof(utsname()->version)));
+	hinf->kernel_ver = LINUX_VERSION_CODE;
+	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_MAJOR, 0);
+	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_MINOR, 0);
+	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_SUB_MINOR, 0);
+	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_MODULE_TYPE, 0);
+	EFA_SET(&hinf->bdf, EFA_ADMIN_HOST_INFO_BUS, dev->pdev->bus->number);
+	EFA_SET(&hinf->bdf, EFA_ADMIN_HOST_INFO_DEVICE,
+		PCI_SLOT(dev->pdev->devfn));
+	EFA_SET(&hinf->bdf, EFA_ADMIN_HOST_INFO_FUNCTION,
+		PCI_FUNC(dev->pdev->devfn));
+	EFA_SET(&hinf->spec_ver, EFA_ADMIN_HOST_INFO_SPEC_MAJOR,
+		EFA_COMMON_SPEC_VERSION_MAJOR);
+	EFA_SET(&hinf->spec_ver, EFA_ADMIN_HOST_INFO_SPEC_MINOR,
+		EFA_COMMON_SPEC_VERSION_MINOR);
+	EFA_SET(&hinf->flags, EFA_ADMIN_HOST_INFO_INTREE, 1);
+	EFA_SET(&hinf->flags, EFA_ADMIN_HOST_INFO_GDR, 0);
+
+	efa_com_set_feature_ex(&dev->edev, &resp, &cmd, EFA_ADMIN_HOST_INFO,
+			       hinf_dma, bufsz);
+
+	dma_free_coherent(&dev->pdev->dev, bufsz, hinf, hinf_dma);
+}
+
 static const struct ib_device_ops efa_dev_ops = {
 	.owner = THIS_MODULE,
 	.driver_id = RDMA_DRIVER_EFA,
@@ -251,6 +299,8 @@ static int efa_ib_device_add(struct efa_dev *dev)
 	if (err)
 		goto err_release_doorbell_bar;
 
+	efa_set_host_info(dev);
+
 	dev->ibdev.node_type = RDMA_NODE_UNSPECIFIED;
 	dev->ibdev.phys_port_cnt = 1;
 	dev->ibdev.num_comp_vectors = 1;