netdev - [RFC PATCH 2/4] i40e: use minimal rx and tx ring buffers for kdump

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Date:   Mon, 22 Feb 2021 15:06:59 +0800
From:   Coiby Xu <coxu@...hat.com>
To:     netdev@...r.kernel.org
Cc:     kexec@...ts.infradead.org, intel-wired-lan@...ts.osuosl.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC PATCH 2/4] i40e: use minimal rx and tx ring buffers for kdump

Use the minimum of the number of descriptors thus we will allocate the
minimal ring buffers for kdump.

Signed-off-by: Coiby Xu <coxu@...hat.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 069c86e2f69d..5307f1744766 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -10552,6 +10552,11 @@ static int i40e_set_num_rings_in_vsi(struct i40e_vsi *vsi)
 		return -ENODATA;
 	}
 
+	if (is_kdump_kernel()) {
+		vsi->num_tx_desc = I40E_MIN_NUM_DESCRIPTORS;
+		vsi->num_rx_desc = I40E_MIN_NUM_DESCRIPTORS;
+	}
+
 	return 0;
 }
 
-- 
2.30.0