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From 65e624b3708cb35942297f699d886aa4c8a7e613 Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Sun, 1 Jan 2017 15:46:26 +0100
Subject: [PATCH] ivshmem-net: Add ethtool register dump
Helps debugging inconsistent states.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
(cherry picked from commit 81674136b6936fb8219dac1dcdb6df8fe424143d)
---
drivers/net/ivshmem-net.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
--- a/drivers/net/ivshmem-net.c
+++ b/drivers/net/ivshmem-net.c
@@ -748,10 +748,41 @@ static void ivshm_net_get_ethtool_stats(
memset(&in->stats, 0, sizeof(in->stats));
}
+#define IVSHM_NET_REGS_LEN (3 * sizeof(u32) + 6 * sizeof(u16))
+
+static int ivshm_net_get_regs_len(struct net_device *ndev)
+{
+ return IVSHM_NET_REGS_LEN;
+}
+
+static void ivshm_net_get_regs(struct net_device *ndev,
+ struct ethtool_regs *regs, void *p)
+{
+ struct ivshm_net *in = netdev_priv(ndev);
+ u32 *reg32 = p;
+ u16 *reg16;
+
+ *reg32++ = in->lstate;
+ *reg32++ = in->rstate;
+ *reg32++ = in->qlen;
+
+ reg16 = (u16 *)reg32;
+
+ *reg16++ = in->tx.vr.avail ? in->tx.vr.avail->idx : 0;
+ *reg16++ = in->tx.vr.used ? in->tx.vr.used->idx : 0;
+ *reg16++ = in->tx.vr.avail ? vring_avail_event(&in->tx.vr) : 0;
+
+ *reg16++ = in->rx.vr.avail ? in->rx.vr.avail->idx : 0;
+ *reg16++ = in->rx.vr.used ? in->rx.vr.used->idx : 0;
+ *reg16++ = in->rx.vr.avail ? vring_avail_event(&in->rx.vr) : 0;
+}
+
static const struct ethtool_ops ivshm_net_ethtool_ops = {
.get_sset_count = ivshm_net_get_sset_count,
.get_strings = ivshm_net_get_strings,
.get_ethtool_stats = ivshm_net_get_ethtool_stats,
+ .get_regs_len = ivshm_net_get_regs_len,
+ .get_regs = ivshm_net_get_regs,
};
static int ivshm_net_probe(struct pci_dev *pdev,
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