enic: reconfigure resources for kdump crash kernel

When running in kdump kernel, reduce number of resources used by the driver.
This will enable NIC to operate in low memory kdump kernel environment.

Also change the driver version to .83

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index 142c9b5509ae..9027fc1cc5f7 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -45,6 +45,7 @@
 #ifdef CONFIG_NET_RX_BUSY_POLL
 #include <net/busy_poll.h>
 #endif
+#include <linux/crash_dump.h>
 
 #include "cq_enet_desc.h"
 #include "vnic_dev.h"
@@ -2265,6 +2266,18 @@ static void enic_dev_deinit(struct enic *enic)
         enic_clear_intr_mode(enic);
 }
 
+static void enic_kdump_kernel_config(struct enic *enic)
+{
+        if (is_kdump_kernel()) {
+                dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
+                enic->rq_count = 1;
+                enic->wq_count = 1;
+                enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
+                enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
+                enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
+        }
+}
+
 static int enic_dev_init(struct enic *enic)
 {
         struct device *dev = enic_get_dev(enic);
@@ -2294,6 +2307,10 @@ static int enic_dev_init(struct enic *enic)
 
         enic_get_res_counts(enic);
 
+        /* modify resource count if we are in kdump_kernel
+         */
+        enic_kdump_kernel_config(enic);
+
         /* Set interrupt mode based on resource counts and system
          * capabilities
          */