[RFC PATCH 3/4] i40e: use minimal admin queue for kdump

[Coiby Xu]

The minimum size of admin send/receive queue is 1 and 2 respectively.
The admin send queue can't be set to 1 because in that case, the
firmware would fail to init.

Signed-off-by: Coiby Xu <coxu at redhat.com>
---
 drivers/net/ethernet/intel/i40e/i40e.h      | 2 ++
 drivers/net/ethernet/intel/i40e/i40e_main.c | 9 +++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 118473dfdcbd..e106c33ff958 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -66,6 +66,8 @@
 #define I40E_FDIR_RING_COUNT		32
 #define I40E_MAX_AQ_BUF_SIZE		4096
 #define I40E_AQ_LEN			256
+#define I40E_MIN_ARQ_LEN		1
+#define I40E_MIN_ASQ_LEN		2
 #define I40E_AQ_WORK_LIMIT		66 /* max number of VFs + a little */
 #define I40E_MAX_USER_PRIORITY		8
 #define I40E_DEFAULT_TRAFFIC_CLASS	BIT(0)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 5307f1744766..2fd8db80b585 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -14847,8 +14847,13 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	i40e_check_recovery_mode(pf);
 
-	hw->aq.num_arq_entries = I40E_AQ_LEN;
-	hw->aq.num_asq_entries = I40E_AQ_LEN;
+	if (is_kdump_kernel()) {
+		hw->aq.num_arq_entries = I40E_MIN_ARQ_LEN;
+		hw->aq.num_asq_entries = I40E_MIN_ASQ_LEN;
+	} else {
+		hw->aq.num_arq_entries = I40E_AQ_LEN;
+		hw->aq.num_asq_entries = I40E_AQ_LEN;
+	}
 	hw->aq.arq_buf_size = I40E_MAX_AQ_BUF_SIZE;
 	hw->aq.asq_buf_size = I40E_MAX_AQ_BUF_SIZE;
 	pf->adminq_work_limit = I40E_AQ_WORK_LIMIT;
-- 
2.30.0