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

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[ 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: fe56b9e6a ("qed: Add module with basic common support")
Signed-off-by: Sudarsana Reddy Kalluru <Sudarsana.Kalluru@cavium.com>
Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudarsana Reddy Kalluru 2018-07-01 20:03:05 -07:00 committed by Greg Kroah-Hartman
parent a648a4636d
commit 0b79604960
1 changed files with 9 additions and 0 deletions
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9
drivers/net/ethernet/qlogic/qed/qed_main.c
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@ -23,6 +23,7 @@
#include <linux/vmalloc.h>
#include <linux/qed/qed_if.h>
#include <linux/qed/qed_ll2_if.h>
#include <linux/crash_dump.h>
#include "qed.h"
#include "qed_sriov.h"
@ -701,6 +702,14 @@ 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");