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Date: Tue, 29 Apr 2014 13:38:29 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Frank Li' <Frank.Li@...escale.com>, "lznuaa@...il.com" <lznuaa@...il.com>, "shawn.guo@...aro.org" <shawn.guo@...aro.org>, "B38611@...escale.com" <B38611@...escale.com>, "davem@...emloft.net" <davem@...emloft.net>, "rmk+kernel@....linux.org.uk" <rmk+kernel@....linux.org.uk> CC: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: RE: [PATCH net-next 5/7] net:fec: add support for dumping transmit ring on timeout From: Of Frank Li ... > When we timeout on transmit, it would be useful to dump the transmit > ring, so we can see the ring state. This can be helpful to diagnose > the cause of transmit timeouts. ... > +static void fec_dump(struct net_device *ndev) > +{ > + struct fec_enet_private *fep = netdev_priv(ndev); > + struct bufdesc *bdp = fep->tx_bd_base; > + unsigned index = 0; > + > + netdev_info(ndev, "TX ring dump\n"); > + pr_info("Nr SC addr len SKB\n"); > + > + do { > + pr_info("%3u %c%c 0x%04x 0x%08lx %4u %p\n", > + index, > + bdp == fep->cur_tx ? 'S' : ' ', > + bdp == fep->dirty_tx ? 'H' : ' ', > + bdp->cbd_sc, bdp->cbd_bufaddr, bdp->cbd_datlen, > + fep->tx_skbuff[index]); > + bdp = fec_enet_get_nextdesc(bdp, fep); > + index++; > + } while (bdp != fep->tx_bd_base); > +} > + You probably want the read and write indexes as well. David -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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