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net: qed: Disable SRIOV functionality inside kdump kernel 

Since we have kdump kernel(s) running under severe memory constraint
it makes sense to disable the qed SRIOV functionality when running the
kdump kernel as kdump configurations on several distributions don't
support SRIOV targets for saving the vmcore (see [1] for example).

Currently the qed SRIOV functionality ends up consuming memory in
the kdump kernel, when we don't really use the same.

An example log seen in the kdump kernel with the SRIOV functionality
enabled can be seen below (obtained via memstrack tool, see [2]):
 dracut-pre-pivot[676]: ======== Report format module_summary: ========
 dracut-pre-pivot[676]: Module qed using 149.6MB (2394 pages), peak allocation 149.6MB (2394 pages)

This patch disables the SRIOV functionality inside kdump kernel and with
the same applied the memory consumption goes down:
 dracut-pre-pivot[671]: ======== Report format module_summary: ========
 dracut-pre-pivot[671]: Module qed using 124.6MB (1993 pages), peak allocation 124.7MB (1995 pages)

[1]. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/installing-and-configuring-kdump_managing-monitoring-and-updating-the-kernel#supported-kdump-targets_supported-kdump-configurations-and-targets
[2]. Memstrack tool: https://github.com/ryncsn/memstrack

Cc: kexec@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: Ariel Elior <aelior@marvell.com>
Cc: GR-everest-linux-l2@marvell.com
Cc: Manish Chopra <manishc@marvell.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bhupesh Sharma 2020-05-11 15:41:42 +05:30 committed by David S. Miller
parent 73e030977f
commit 37d4f8a6b4
2 changed files with 8 additions and 4 deletions
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10
drivers/net/ethernet/qlogic/qed/qed_sriov.h
View File

@ -32,6 +32,7 @@
#ifndef _QED_SRIOV_H
#define _QED_SRIOV_H
#include <linux/crash_dump.h>
#include <linux/types.h>
#include "qed_vf.h"
@ -40,9 +41,12 @@
#define QED_VF_ARRAY_LENGTH (3)
#ifdef CONFIG_QED_SRIOV
#define IS_VF(cdev) ((cdev)->b_is_vf)
#define IS_PF(cdev) (!((cdev)->b_is_vf))
#define IS_PF_SRIOV(p_hwfn) (!!((p_hwfn)->cdev->p_iov_info))
#define IS_VF(cdev) (is_kdump_kernel() ? \
(0) : ((cdev)->b_is_vf))
#define IS_PF(cdev) (is_kdump_kernel() ? \
(1) : !((cdev)->b_is_vf))
#define IS_PF_SRIOV(p_hwfn) (is_kdump_kernel() ? \
(0) : !!((p_hwfn)->cdev->p_iov_info))
#else
#define IS_VF(cdev) (0)
#define IS_PF(cdev) (1)

2
drivers/net/ethernet/qlogic/qede/qede_main.c
View File

@ -1214,7 +1214,7 @@ static int qede_probe(struct pci_dev *pdev, const struct pci_device_id *id)
case QEDE_PRIVATE_VF:
if (debug & QED_LOG_VERBOSE_MASK)
dev_err(&pdev->dev, "Probing a VF\n");
is_vf = true;
is_vf = is_kdump_kernel() ? false : true;
break;
default:
if (debug & QED_LOG_VERBOSE_MASK)