On Thu, 15 Nov 2007 20:42:55 -0600
"Jon Nelson" <[EMAIL PROTECTED]> wrote:
> On 11/15/07, Jarek Poplawski <[EMAIL PROTECTED]> wrote:
> ..
>
> > Sure! I was only worried velocity_open() treats dev->mtu
> > a bit different than velocity_change_mtu(), so eg. after:
> >
> > velocity_change_mtu() // dev is down
> > velocity_open()
> > velocity_change_mtu() // dev is up
> >
> > with the same mtu, vptr->rx_buf_sz could be different than after:
> >
> > velocity_open()
> > velocity_change_mtu() // dev is up
> >
> > But, probably, I miss someting.
>
> There is a snag here: if I change the MTU after the device is UP
> something ends up rather broken. A tcpdump shows nearly every outgoing
> frame has a bad TCP checksum (and the card does not support H/W
> checksumming or it is turned off as reported by ethtool).
>
Does this fix the problem.
Note: reading the code the driver has other problems (besides crappy
style). It does pci_map_single()/unmap in a way that doesn't account
correctly for the padding that was added.
--- a/drivers/net/via-velocity.c 2007-11-15 20:11:12.000000000 -0800
+++ b/drivers/net/via-velocity.c 2007-11-15 20:32:14.000000000 -0800
@@ -1242,6 +1242,9 @@ static int velocity_rx_refill(struct vel
static int velocity_init_rd_ring(struct velocity_info *vptr)
{
int ret;
+ int mtu = vptr->dev->mtu;
+
+ vptr->rx_buf_sz = (mtu <= ETH_DATA_LEN) ? PKT_BUF_SZ : mtu + 32;
vptr->rd_info = kcalloc(vptr->options.numrx,
sizeof(struct velocity_rd_info), GFP_KERNEL);
@@ -1898,8 +1901,6 @@ static int velocity_open(struct net_devi
struct velocity_info *vptr = netdev_priv(dev);
int ret;
- vptr->rx_buf_sz = (dev->mtu <= 1504 ? PKT_BUF_SZ : dev->mtu + 32);
-
ret = velocity_init_rings(vptr);
if (ret < 0)
goto out;
@@ -1978,12 +1979,6 @@ static int velocity_change_mtu(struct ne
velocity_free_rd_ring(vptr);
dev->mtu = new_mtu;
- if (new_mtu > 8192)
- vptr->rx_buf_sz = 9 * 1024;
- else if (new_mtu > 4096)
- vptr->rx_buf_sz = 8192;
- else
- vptr->rx_buf_sz = 4 * 1024;
ret = velocity_init_rd_ring(vptr);
if (ret < 0)
--
Stephen Hemminger <[EMAIL PROTECTED]>
-
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