Commit dd537828 authored Jul 01, 2018 by Sudarsana Reddy Kalluru Committed by Greg Kroah-Hartman Jul 22, 2018

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



[ Upstream commit bb7858ba ]

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: 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>

parent 023a2043

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

+8 −0

Original line number	Diff line number	Diff line
		@@ -779,6 +779,14 @@ 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");