Message ID | 7a49f4c0ea2f5030068729978c2cb173a6e15857.1259893118.git.amit.kucheria@canonical.com |
---|---|
State | RFC, archived |
Delegated to: | David Miller |
Headers | show |
On Fri, Dec 04, 2009 at 04:47:06AM +0200, Amit Kucheria wrote: > From: Rob Herring <r.herring@freescale.com> > > The fec driver was enabling receive buffer descriptor without allocating > the buffers. Make sure the buffer descriptors are initialized to not > start receiving packets. > > Signed-off-by: Rob Herring <r.herring@freescale.com> > Signed-off-by: Amit Kucheria <amit.kucheria@canonical.com> > Cc: David S. Miller <davem@davemloft.net> > Cc: netdev@vger.kernel.org > --- > drivers/net/fec.c | 57 +++++++++++++++++++++++++++-------------------------- > 1 files changed, 29 insertions(+), 28 deletions(-) > > diff --git a/drivers/net/fec.c b/drivers/net/fec.c > index 16a1d58..9a8743d 100644 > --- a/drivers/net/fec.c > +++ b/drivers/net/fec.c > @@ -1658,6 +1658,7 @@ static int fec_enet_init(struct net_device *dev, int index) > { > struct fec_enet_private *fep = netdev_priv(dev); > struct bufdesc *cbd_base; > + struct bufdesc *bdp; > int i; > > /* Allocate memory for buffer descriptors. */ > @@ -1710,6 +1711,34 @@ static int fec_enet_init(struct net_device *dev, int index) > /* Set MII speed to 2.5 MHz */ > fep->phy_speed = ((((clk_get_rate(fep->clk) / 2 + 4999999) > / 2500000) / 2) & 0x3F) << 1; > + > + /* Initialize the receive buffer descriptors. */ > + bdp = fep->rx_bd_base; > + for (i = 0; i < RX_RING_SIZE; i++) { > + > + /* Initialize the BD for every fragment in the page. */ > + bdp->cbd_sc = 0; > + bdp++; > + } > + > + /* Set the last buffer to wrap */ > + bdp--; > + bdp->cbd_sc |= BD_SC_WRAP; > + > + /* ...and the same for transmit */ > + bdp = fep->tx_bd_base; > + for (i = 0; i < TX_RING_SIZE; i++) { > + > + /* Initialize the BD for every fragment in the page. */ > + bdp->cbd_sc = 0; > + bdp->cbd_bufaddr = 0; > + bdp++; > + } > + > + /* Set the last buffer to wrap */ > + bdp--; > + bdp->cbd_sc |= BD_SC_WRAP; > + > fec_restart(dev, 0); I do not really understand why this patch is needed. You move the buffer initialisation from fec_restart to fec_enet_init, but fec_restart is called directly after the initialisation, so this shouldn't change much. I don't need this patch on my boards, so I wonder what is really going wrong here. Sascha > > /* Queue up command to detect the PHY and initialize the > @@ -1730,7 +1759,6 @@ static void > fec_restart(struct net_device *dev, int duplex) > { > struct fec_enet_private *fep = netdev_priv(dev); > - struct bufdesc *bdp; > int i; > > /* Whack a reset. We should wait for this. */ > @@ -1768,33 +1796,6 @@ fec_restart(struct net_device *dev, int duplex) > } > } > > - /* Initialize the receive buffer descriptors. */ > - bdp = fep->rx_bd_base; > - for (i = 0; i < RX_RING_SIZE; i++) { > - > - /* Initialize the BD for every fragment in the page. */ > - bdp->cbd_sc = BD_ENET_RX_EMPTY; > - bdp++; > - } > - > - /* Set the last buffer to wrap */ > - bdp--; > - bdp->cbd_sc |= BD_SC_WRAP; > - > - /* ...and the same for transmit */ > - bdp = fep->tx_bd_base; > - for (i = 0; i < TX_RING_SIZE; i++) { > - > - /* Initialize the BD for every fragment in the page. */ > - bdp->cbd_sc = 0; > - bdp->cbd_bufaddr = 0; > - bdp++; > - } > - > - /* Set the last buffer to wrap */ > - bdp--; > - bdp->cbd_sc |= BD_SC_WRAP; > - > /* Enable MII mode */ > if (duplex) { > /* MII enable / FD enable */ > -- > 1.6.3.3 > >
Sascha, > -----Original Message----- > From: Sascha Hauer [mailto:s.hauer@pengutronix.de] > Sent: Friday, December 04, 2009 5:14 AM > To: Amit Kucheria > Cc: List Linux Kernel; Herring Robert-RA7055; David S. > Miller; netdev@vger.kernel.org; > linux-arm-kernel@lists.infradead.org; > valentin.longchamp@epfl.ch; daniel@caiaq.de; > grant.likely@secretlab.ca; Nguyen Dinh-R00091 > Subject: Re: [RFC][PATCH 06/10] fec: fix uninitialized rx buffer usage > > On Fri, Dec 04, 2009 at 04:47:06AM +0200, Amit Kucheria wrote: > > From: Rob Herring <r.herring@freescale.com> > > > > The fec driver was enabling receive buffer descriptor > without allocating > > the buffers. Make sure the buffer descriptors are initialized to not > > start receiving packets. > > > > Signed-off-by: Rob Herring <r.herring@freescale.com> > > Signed-off-by: Amit Kucheria <amit.kucheria@canonical.com> > > Cc: David S. Miller <davem@davemloft.net> > > Cc: netdev@vger.kernel.org > > --- > > drivers/net/fec.c | 57 > +++++++++++++++++++++++++++-------------------------- > > 1 files changed, 29 insertions(+), 28 deletions(-) > > > > diff --git a/drivers/net/fec.c b/drivers/net/fec.c > > index 16a1d58..9a8743d 100644 > > --- a/drivers/net/fec.c > > +++ b/drivers/net/fec.c > > @@ -1658,6 +1658,7 @@ static int fec_enet_init(struct > net_device *dev, int index) > > { > > struct fec_enet_private *fep = netdev_priv(dev); > > struct bufdesc *cbd_base; > > + struct bufdesc *bdp; > > int i; > > > > /* Allocate memory for buffer descriptors. */ > > @@ -1710,6 +1711,34 @@ static int fec_enet_init(struct > net_device *dev, int index) > > /* Set MII speed to 2.5 MHz */ > > fep->phy_speed = ((((clk_get_rate(fep->clk) / 2 + 4999999) > > / 2500000) / 2) & 0x3F) << 1; > > + > > + /* Initialize the receive buffer descriptors. */ > > + bdp = fep->rx_bd_base; > > + for (i = 0; i < RX_RING_SIZE; i++) { > > + > > + /* Initialize the BD for every fragment in the page. */ > > + bdp->cbd_sc = 0; > > + bdp++; > > + } > > + > > + /* Set the last buffer to wrap */ > > + bdp--; > > + bdp->cbd_sc |= BD_SC_WRAP; > > + > > + /* ...and the same for transmit */ > > + bdp = fep->tx_bd_base; > > + for (i = 0; i < TX_RING_SIZE; i++) { > > + > > + /* Initialize the BD for every fragment in the page. */ > > + bdp->cbd_sc = 0; > > + bdp->cbd_bufaddr = 0; > > + bdp++; > > + } > > + > > + /* Set the last buffer to wrap */ > > + bdp--; > > + bdp->cbd_sc |= BD_SC_WRAP; > > + > > fec_restart(dev, 0); > > I do not really understand why this patch is needed. You move > the buffer > initialisation from fec_restart to fec_enet_init, but fec_restart is > called directly after the initialisation, so this shouldn't > change much. > > I don't need this patch on my boards, so I wonder what is really going > wrong here. It is because open also calls fec_restart after the rx buffers are allocated. With the code in fec_restart, it zeroes out the buffer descriptors that have just been setup. I can't explain how it would work for you. Regards, Rob > > Sascha > > > > > > /* Queue up command to detect the PHY and initialize the > > @@ -1730,7 +1759,6 @@ static void > > fec_restart(struct net_device *dev, int duplex) > > { > > struct fec_enet_private *fep = netdev_priv(dev); > > - struct bufdesc *bdp; > > int i; > > > > /* Whack a reset. We should wait for this. */ > > @@ -1768,33 +1796,6 @@ fec_restart(struct net_device *dev, > int duplex) > > } > > } > > > > - /* Initialize the receive buffer descriptors. */ > > - bdp = fep->rx_bd_base; > > - for (i = 0; i < RX_RING_SIZE; i++) { > > - > > - /* Initialize the BD for every fragment in the page. */ > > - bdp->cbd_sc = BD_ENET_RX_EMPTY; > > - bdp++; > > - } > > - > > - /* Set the last buffer to wrap */ > > - bdp--; > > - bdp->cbd_sc |= BD_SC_WRAP; > > - > > - /* ...and the same for transmit */ > > - bdp = fep->tx_bd_base; > > - for (i = 0; i < TX_RING_SIZE; i++) { > > - > > - /* Initialize the BD for every fragment in the page. */ > > - bdp->cbd_sc = 0; > > - bdp->cbd_bufaddr = 0; > > - bdp++; > > - } > > - > > - /* Set the last buffer to wrap */ > > - bdp--; > > - bdp->cbd_sc |= BD_SC_WRAP; > > - > > /* Enable MII mode */ > > if (duplex) { > > /* MII enable / FD enable */ > > -- > > 1.6.3.3 > > > > > > -- > Pengutronix e.K. | > | > Industrial Linux Solutions | > http://www.pengutronix.de/ | > Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: > +49-5121-206917-0 | > Amtsgericht Hildesheim, HRA 2686 | Fax: > +49-5121-206917-5555 | > > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/fec.c b/drivers/net/fec.c index 16a1d58..9a8743d 100644 --- a/drivers/net/fec.c +++ b/drivers/net/fec.c @@ -1658,6 +1658,7 @@ static int fec_enet_init(struct net_device *dev, int index) { struct fec_enet_private *fep = netdev_priv(dev); struct bufdesc *cbd_base; + struct bufdesc *bdp; int i; /* Allocate memory for buffer descriptors. */ @@ -1710,6 +1711,34 @@ static int fec_enet_init(struct net_device *dev, int index) /* Set MII speed to 2.5 MHz */ fep->phy_speed = ((((clk_get_rate(fep->clk) / 2 + 4999999) / 2500000) / 2) & 0x3F) << 1; + + /* Initialize the receive buffer descriptors. */ + bdp = fep->rx_bd_base; + for (i = 0; i < RX_RING_SIZE; i++) { + + /* Initialize the BD for every fragment in the page. */ + bdp->cbd_sc = 0; + bdp++; + } + + /* Set the last buffer to wrap */ + bdp--; + bdp->cbd_sc |= BD_SC_WRAP; + + /* ...and the same for transmit */ + bdp = fep->tx_bd_base; + for (i = 0; i < TX_RING_SIZE; i++) { + + /* Initialize the BD for every fragment in the page. */ + bdp->cbd_sc = 0; + bdp->cbd_bufaddr = 0; + bdp++; + } + + /* Set the last buffer to wrap */ + bdp--; + bdp->cbd_sc |= BD_SC_WRAP; + fec_restart(dev, 0); /* Queue up command to detect the PHY and initialize the @@ -1730,7 +1759,6 @@ static void fec_restart(struct net_device *dev, int duplex) { struct fec_enet_private *fep = netdev_priv(dev); - struct bufdesc *bdp; int i; /* Whack a reset. We should wait for this. */ @@ -1768,33 +1796,6 @@ fec_restart(struct net_device *dev, int duplex) } } - /* Initialize the receive buffer descriptors. */ - bdp = fep->rx_bd_base; - for (i = 0; i < RX_RING_SIZE; i++) { - - /* Initialize the BD for every fragment in the page. */ - bdp->cbd_sc = BD_ENET_RX_EMPTY; - bdp++; - } - - /* Set the last buffer to wrap */ - bdp--; - bdp->cbd_sc |= BD_SC_WRAP; - - /* ...and the same for transmit */ - bdp = fep->tx_bd_base; - for (i = 0; i < TX_RING_SIZE; i++) { - - /* Initialize the BD for every fragment in the page. */ - bdp->cbd_sc = 0; - bdp->cbd_bufaddr = 0; - bdp++; - } - - /* Set the last buffer to wrap */ - bdp--; - bdp->cbd_sc |= BD_SC_WRAP; - /* Enable MII mode */ if (duplex) { /* MII enable / FD enable */