4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sudarsana Reddy Kalluru sudarsana.kalluru@cavium.com
[ 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 --- drivers/net/ethernet/qlogic/qed/qed_main.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c +++ b/drivers/net/ethernet/qlogic/qed/qed_main.c @@ -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 /* 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");