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Commit 6f6d1452 authored by Sudarsana Reddy Kalluru's avatar Sudarsana Reddy Kalluru Committed by Greg Kroah-Hartman
Browse files

qed: Limit msix vectors in kdump kernel to the minimum required count. 



[ Upstream commit bb7858ba1102f82470a917e041fd23e6385c31be ]

Memory size is limited in the kdump kernel environment. Allocation of more
msix-vectors (or queues) consumes few tens of MBs of memory, which might
lead to the kdump kernel failure.
This patch adds changes to limit the number of MSI-X vectors in kdump
kernel to minimum required value (i.e., 2 per engine).

Fixes: fe56b9e6 ("qed: Add module with basic common support")
Signed-off-by: default avatarSudarsana Reddy Kalluru <Sudarsana.Kalluru@cavium.com>
Signed-off-by: default avatarMichal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6ac40d2d

drivers/net/ethernet/qlogic/qed/qed_main.c

+9 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <linux/etherdevice.h>

#include <linux/vmalloc.h>

#include <linux/qed/qed_if.h>

#include <linux/crash_dump.h>



#include "qed.h"

#include "qed_sp.h"
@@ -634,6 +635,14 @@ static int qed_slowpath_setup_int(struct qed_dev *cdev, 
	/* We want a minimum of one slowpath and one fastpath vector per hwfn */

	cdev->int_params.in.min_msix_cnt = cdev->num_hwfns * 2;



	if (is_kdump_kernel()) {

		DP_INFO(cdev,

			"Kdump kernel: Limit the max number of requested MSI-X vectors to %hd\n",

			cdev->int_params.in.min_msix_cnt);

		cdev->int_params.in.num_vectors =

			cdev->int_params.in.min_msix_cnt;

	}



	rc = qed_set_int_mode(cdev, false);

	if (rc)  {

		DP_ERR(cdev, "qed_slowpath_setup_int ERR\n");