From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: [PATCH 6/7] 8139cp: Dump contents of descriptor ring on TX timeout Date: Mon, 21 Sep 2015 15:03:19 +0100 Message-ID: <1442844199.7367.16.camel@infradead.org> References: <1442843991.7367.4.camel@infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-81X+4P3CH+tjJV/pAgUR" Cc: romieu@fr.zoreil.com To: netdev@vger.kernel.org Return-path: Received: from bombadil.infradead.org ([198.137.202.9]:44930 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932103AbbIUODX (ORCPT ); Mon, 21 Sep 2015 10:03:23 -0400 In-Reply-To: <1442843991.7367.4.camel@infradead.org> Sender: netdev-owner@vger.kernel.org List-ID: --=-81X+4P3CH+tjJV/pAgUR Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse We are seeing unexplained TX timeouts under heavy load. Let's try to get a better idea of what's going on. Signed-off-by: David Woodhouse --- drivers/net/ethernet/realtek/8139cp.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/r= ealtek/8139cp.c index 036ad85..6feff9f 100644 --- a/drivers/net/ethernet/realtek/8139cp.c +++ b/drivers/net/ethernet/realtek/8139cp.c @@ -157,6 +157,7 @@ enum { NWayAdvert =3D 0x66, /* MII ADVERTISE */ NWayLPAR =3D 0x68, /* MII LPA */ NWayExpansion =3D 0x6A, /* MII Expansion */ + TxDmaOkLowDesc =3D 0x82, /* Low 16 bit address of a Tx descriptor. */ Config5 =3D 0xD8, /* Config5 */ TxPoll =3D 0xD9, /* Tell chip to check Tx descriptors for work */ RxMaxSize =3D 0xDA, /* Max size of an Rx packet (8169 only) */ @@ -1263,7 +1264,7 @@ static void cp_tx_timeout(struct net_device *dev) { struct cp_private *cp =3D netdev_priv(dev); unsigned long flags; - int rc; + int rc, i; =20 netdev_warn(dev, "Transmit timeout, status %2x %4x %4x %4x\n", cpr8(Cmd), cpr16(CpCmd), @@ -1271,6 +1272,17 @@ static void cp_tx_timeout(struct net_device *dev) =20 spin_lock_irqsave(&cp->lock, flags); =20 + netif_dbg(cp, tx_err, cp->dev, "TX ring head %d tail %d desc %x\n", + cp->tx_head, cp->tx_tail, cpr16(TxDmaOkLowDesc)); + for (i =3D 0; i < CP_TX_RING_SIZE; i++) { + netif_dbg(cp, tx_err, cp->dev, + "TX slot %d @%p: %08x (%08x) %08x %llx %p\n", + i, &cp->tx_ring[i], le32_to_cpu(cp->tx_ring[i].opts1), + cp->tx_opts[i], le32_to_cpu(cp->tx_ring[i].opts2), + le64_to_cpu(cp->tx_ring[i].addr), + cp->tx_skb[i]); + } + cp_stop_hw(cp); cp_clean_rings(cp); rc =3D cp_init_rings(cp); --=20 2.4.3 --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-81X+4P3CH+tjJV/pAgUR Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw 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