* [PATCH] gro: refetch inet6_protos[] after pulling ext headers
From: Yan, Zheng @ 2011-10-09 8:34 UTC (permalink / raw)
To: netdev@vger.kernel.org, Herbert Xu, davem@davemloft.net
ipv6_gro_receive() doesn't update the protocol ops after pulling
the ext headers. It looks like a typo.
Signed-off-by: Zheng Yan <zheng.z.yan@intel.com>
---
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 3b5669a..d27c797 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -875,6 +875,7 @@ static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
skb_reset_transport_header(skb);
__skb_push(skb, skb_gro_offset(skb));
+ ops = rcu_dereference(inet6_protos[proto]);
if (!ops || !ops->gro_receive)
goto out_unlock;
^ permalink raw reply related
* Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is enabled
From: Eli Cohen @ 2011-10-09 8:07 UTC (permalink / raw)
To: Benjamin Herrenschmidt
Cc: Thadeu Lima de Souza Cascardo, Yevgeny Petrilin,
netdev@vger.kernel.org, Eli Cohen, linuxppc-dev
In-Reply-To: <1318147254.29415.377.camel@pasglop>
On Sun, Oct 09, 2011 at 10:00:54AM +0200, Benjamin Herrenschmidt wrote:
> On Sun, 2011-10-09 at 09:35 +0200, Eli Cohen wrote:
> > On Sun, Oct 09, 2011 at 09:25:18AM +0200, Benjamin Herrenschmidt wrote:
> > > On Thu, 2011-10-06 at 15:57 +0200, Eli Cohen wrote:
> > > > On Wed, Oct 05, 2011 at 10:15:02AM +0200, Eli Cohen wrote:
> > > >
> > > > How about this patch - can you give it a try?
> > > >
> > > >
> > > > >From dee60547aa9e35a02835451d9e694cd80dd3072f Mon Sep 17 00:00:00 2001
> > > > From: Eli Cohen <eli@mellanox.co.il>
> > > > Date: Thu, 6 Oct 2011 15:50:02 +0200
> > > > Subject: [PATCH] mlx4_en: Fix blue flame on powerpc
> > > >
> > > > The source buffer used for copying into the blue flame register is already in
> > > > big endian. However, when copying to device on powerpc, the endianess is
> > > > swapped so the data reaches th device in little endian which is wrong. On x86
> > > > based platform no swapping occurs so it reaches the device with the correct
> > > > endianess. Fix this by calling le32_to_cpu() on the buffer. On LE systems there
> > > > is no change; on BE there will be a swap.
> > >
> > > That looks wrong.
> > Not sure I understand: are you saying that on ppc, when you call
> > __iowrite64_copy, it will not reach the device swapped?
>
> Well, first, what do you mean by "swapped" ? :-) But no, it won't for
> all intend and purpose, this is a copy routine, copy routines never
> swap, neither do fifo accesses for example.
When I say swapped, I mean not necessairliy by software. I think that
the chipset will swap the the data. The reason I think so is that the
CPU arch is big endian, while PCI bus is defined as little endian.
That's why I think a swap will occur in ppc and not in x86.
>
> > The point is that we must always have the buffer ready in big endian
> > in memory. In the case of blue flame, we must also copy it to the
> > device registers in pci memory space. So if we use the buffer we
> > already prepared, we must have another swap. I can think of a nicer
> > way to implement this functionality but the question is do you think
> > my observation above is wrong and why.
>
> No. If it's in memory BE then the copy routine will keep it BE. A copy
> routine doesn't swap and doesn't affect endianness.
>
> Additionally, a swapping phase like you proposed doing 32-bit swaps
> means that you know for sure that the buffer is made of 32-bit
> quantities, is that the case ?
Yes
> Even if you had needed that swap, if your
> buffer had contained 16-bit or 64-bit quantities, you're toast.
>
> What is this buffer anyway ? A descriptor or a network packet ?
It's a special descriptor that resides both in memory and also written
to the device's register. An it contains both data and control
informartion.
>
> If it's a packet, then it's data, endianness has no meaning (or rather
> it has for individual fields of the packets but they are already in the
> right format and a 32-bit swap will never be right).
>
> It's almost never right to perform swapping when copying data (or
> reading/writing a FIFO).
>
> Cheers,
> Ben.
^ permalink raw reply
* Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is enabled
From: Benjamin Herrenschmidt @ 2011-10-09 8:00 UTC (permalink / raw)
To: Eli Cohen
Cc: netdev@vger.kernel.org, Eli Cohen, linuxppc-dev,
Thadeu Lima de Souza Cascardo, Yevgeny Petrilin
In-Reply-To: <20111009073546.GI2681@mtldesk30>
On Sun, 2011-10-09 at 09:35 +0200, Eli Cohen wrote:
> On Sun, Oct 09, 2011 at 09:25:18AM +0200, Benjamin Herrenschmidt wrote:
> > On Thu, 2011-10-06 at 15:57 +0200, Eli Cohen wrote:
> > > On Wed, Oct 05, 2011 at 10:15:02AM +0200, Eli Cohen wrote:
> > >
> > > How about this patch - can you give it a try?
> > >
> > >
> > > >From dee60547aa9e35a02835451d9e694cd80dd3072f Mon Sep 17 00:00:00 2001
> > > From: Eli Cohen <eli@mellanox.co.il>
> > > Date: Thu, 6 Oct 2011 15:50:02 +0200
> > > Subject: [PATCH] mlx4_en: Fix blue flame on powerpc
> > >
> > > The source buffer used for copying into the blue flame register is already in
> > > big endian. However, when copying to device on powerpc, the endianess is
> > > swapped so the data reaches th device in little endian which is wrong. On x86
> > > based platform no swapping occurs so it reaches the device with the correct
> > > endianess. Fix this by calling le32_to_cpu() on the buffer. On LE systems there
> > > is no change; on BE there will be a swap.
> >
> > That looks wrong.
> Not sure I understand: are you saying that on ppc, when you call
> __iowrite64_copy, it will not reach the device swapped?
Well, first, what do you mean by "swapped" ? :-) But no, it won't for
all intend and purpose, this is a copy routine, copy routines never
swap, neither do fifo accesses for example.
> The point is that we must always have the buffer ready in big endian
> in memory. In the case of blue flame, we must also copy it to the
> device registers in pci memory space. So if we use the buffer we
> already prepared, we must have another swap. I can think of a nicer
> way to implement this functionality but the question is do you think
> my observation above is wrong and why.
No. If it's in memory BE then the copy routine will keep it BE. A copy
routine doesn't swap and doesn't affect endianness.
Additionally, a swapping phase like you proposed doing 32-bit swaps
means that you know for sure that the buffer is made of 32-bit
quantities, is that the case ? Even if you had needed that swap, if your
buffer had contained 16-bit or 64-bit quantities, you're toast.
What is this buffer anyway ? A descriptor or a network packet ?
If it's a packet, then it's data, endianness has no meaning (or rather
it has for individual fields of the packets but they are already in the
right format and a 32-bit swap will never be right).
It's almost never right to perform swapping when copying data (or
reading/writing a FIFO).
Cheers,
Ben.
^ permalink raw reply
* Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is enabled
From: Eli Cohen @ 2011-10-09 7:35 UTC (permalink / raw)
To: Benjamin Herrenschmidt
Cc: Thadeu Lima de Souza Cascardo, Yevgeny Petrilin,
netdev@vger.kernel.org, Eli Cohen, linuxppc-dev
In-Reply-To: <1318145118.29415.371.camel@pasglop>
On Sun, Oct 09, 2011 at 09:25:18AM +0200, Benjamin Herrenschmidt wrote:
> On Thu, 2011-10-06 at 15:57 +0200, Eli Cohen wrote:
> > On Wed, Oct 05, 2011 at 10:15:02AM +0200, Eli Cohen wrote:
> >
> > How about this patch - can you give it a try?
> >
> >
> > >From dee60547aa9e35a02835451d9e694cd80dd3072f Mon Sep 17 00:00:00 2001
> > From: Eli Cohen <eli@mellanox.co.il>
> > Date: Thu, 6 Oct 2011 15:50:02 +0200
> > Subject: [PATCH] mlx4_en: Fix blue flame on powerpc
> >
> > The source buffer used for copying into the blue flame register is already in
> > big endian. However, when copying to device on powerpc, the endianess is
> > swapped so the data reaches th device in little endian which is wrong. On x86
> > based platform no swapping occurs so it reaches the device with the correct
> > endianess. Fix this by calling le32_to_cpu() on the buffer. On LE systems there
> > is no change; on BE there will be a swap.
>
> That looks wrong.
Not sure I understand: are you saying that on ppc, when you call
__iowrite64_copy, it will not reach the device swapped?
The point is that we must always have the buffer ready in big endian
in memory. In the case of blue flame, we must also copy it to the
device registers in pci memory space. So if we use the buffer we
already prepared, we must have another swap. I can think of a nicer
way to implement this functionality but the question is do you think
my observation above is wrong and why.
>
> What is this __iowrite64_copy... oh I see
>
> Nice, somebody _AGAIN_ added a bunch of "generic" IO accessors that are
> utterly wrong on all archs except x86 (ok, -almost-). There isn't a
> single bloody memory barrier in there !
>
> So, __iowrite64_copy is doing raw_writel which will -not- swap, so your
> buffer is going to have the same endianness in the destination than it
> has in the source. This is _NOT_ the right place to do a swap.
>
> It's the original construction of the descriptor that needs change. The
> data itself should never need to be affected accross a copy operation
> (unless your HW is terminally busted).
>
> Cheers,
> Ben.
>
> > Signed-off-by: Eli Cohen <eli@mellanox.co.il>
> > ---
> > drivers/net/mlx4/en_tx.c | 10 ++++++++++
> > 1 files changed, 10 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/net/mlx4/en_tx.c b/drivers/net/mlx4/en_tx.c
> > index 16337fb..3743acc 100644
> > --- a/drivers/net/mlx4/en_tx.c
> > +++ b/drivers/net/mlx4/en_tx.c
> > @@ -601,6 +601,16 @@ u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb)
> >
> > static void mlx4_bf_copy(unsigned long *dst, unsigned long *src, unsigned bytecnt)
> > {
> > + int i;
> > + __le32 *psrc = (__le32 *)src;
> > +
> > + /*
> > + * the buffer is already in big endian. For little endian machines that's
> > + * fine. For big endain machines we must swap since the chipset swaps again
> > + */
> > + for (i = 0; i < bytecnt / 4; ++i)
> > + psrc[i] = le32_to_cpu(psrc[i]);
> > +
> > __iowrite64_copy(dst, src, bytecnt / 8);
> > }
> >
> > --
> > 1.7.7.rc0.70.g82660
> >
> >
> >
> > > On Tue, Oct 04, 2011 at 05:26:20PM -0300, Thadeu Lima de Souza Cascardo wrote:
> > >
> > > I believe we have an endianess problem here. The source buffer is in
> > > big endian - in x86 archs, it will rich the pci device unswapped since
> > > both x86 and pci are little endian. In ppc, it wil be swapped by the
> > > chipset so it will reach the device in little endian which is wrong.
> > > So, in mlx4_bf_copy, you could loop over the buffer and swap32 the all
> > > the dwords before the call to __iowrite64_copy. Of course which should
> > > fix this in an arch independent manner. Let me know this works for
> > > you.
> > >
> > > > On Tue, Oct 04, 2011 at 08:02:12AM +0200, Benjamin Herrenschmidt wrote:
> > > > > On Mon, 2011-10-03 at 17:53 -0300, Thadeu Lima de Souza Cascardo wrote:
> > > > >
> > > > > .../...
> > > > >
> > > > > > > Can you also send me the output of ethtool -i?
> > > > > > > It seems that there is a problem with write combining on Power processors, we will check this issue.
> > > > > > >
> > > > > > > Yevgeny
> > > > > >
> > > > > > Hello, Yevgeny.
> > > > > >
> > > > > > You will find the output of ethtool -i below.
> > > > > >
> > > > > > I am copying Ben and powerpc list, in case this is an issue with Power
> > > > > > processors. They can provide us some more insight into this.
> > > > >
> > > > > May I get some background please ? :-)
> > > > >
> > > > > I'm not aware of a specific issue with write combining but I'd need to
> > > > > know more about what you are doing and the code to do it to comment on
> > > > > whether it should work or not.
> > > > >
> > > > > Cheers,
> > > > > Ben.
> > > > >
> > > > >
> > > >
> > > > Hello, Ben.
> > > >
> > > > Sorry for that. I am testing mlx4_en driver on a POWER. Yevgeny has
> > > > added blue frame support, that does not require writing to the device
> > > > memory to indicate a new packet (the doorbell register as it is called).
> > > >
> > > > Well, the ring is getting full with no interrupt or packets transmitted.
> > > > I simply added a write to the doorbell register and it works for me.
> > > > Yevgeny says this is not the right fix, claiming there is a problem with
> > > > write combining on POWER. The code uses memory barriers, so I don't know
> > > > why there is any problem.
> > > >
> > > > I am posting the code here to show better what the situation is.
> > > > Yevgeny can tell more about the device and the driver.
> > > >
> > > > The code below is the driver as of now, including a diff with what I
> > > > changed and had resulted OK for me. Before the blue frame support, the
> > > > only code executed was the else part. I can't tell much what the device
> > > > should be seeing and doing after the blue frame part of the code is
> > > > executed. But it does send the packet if I write to the doorbell
> > > > register.
> > > >
> > > > Yevgeny, can you tell us what the device should be doing and why you
> > > > think this is a problem on POWER? Is it possible that this is simply a
> > > > problem with the firmware version?
> > > >
> > > > Thanks,
> > > > Cascardo.
> > > >
> > > > ---
> > > > if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
> > > > !vlan_tag) {
> > > > *(u32 *) (&tx_desc->ctrl.vlan_tag) |=
> > > > ring->doorbell_qpn;
> > > > op_own |= htonl((bf_index & 0xffff) << 8);
> > > > /* Ensure new descirptor hits memory
> > > > * before setting ownership of this descriptor to HW */
> > > > wmb();
> > > > tx_desc->ctrl.owner_opcode = op_own;
> > > >
> > > > wmb();
> > > >
> > > > mlx4_bf_copy(ring->bf.reg + ring->bf.offset, (unsigned
> > > > long *) &tx_desc->ctrl,
> > > > desc_size);
> > > >
> > > > wmb();
> > > >
> > > > ring->bf.offset ^= ring->bf.buf_size;
> > > > } else {
> > > > /* Ensure new descirptor hits memory
> > > > * before setting ownership of this descriptor to HW */
> > > > wmb();
> > > > tx_desc->ctrl.owner_opcode = op_own;
> > > > - wmb();
> > > > - writel(ring->doorbell_qpn, ring->bf.uar->map +
> > > > MLX4_SEND_DOORBELL);
> > > > }
> > > >
> > > > + wmb();
> > > > + writel(ring->doorbell_qpn, ring->bf.uar->map +
> > > > MLX4_SEND_DOORBELL);
> > > > +
> > > > ---
>
^ permalink raw reply
* RE: [PATCH] mlx4_en: fix transmit of packages when blue frame isenabled
From: Benjamin Herrenschmidt @ 2011-10-09 7:28 UTC (permalink / raw)
To: David Laight
Cc: Eli Cohen, Thadeu Lima de Souza Cascardo, Eli Cohen,
Yevgeny Petrilin, linuxppc-dev, netdev
In-Reply-To: <AE90C24D6B3A694183C094C60CF0A2F6D8AE76@saturn3.aculab.com>
On Thu, 2011-10-06 at 15:10 +0100, David Laight wrote:
> horrid...
> 1) I'm not sure the caller expects the buffer to be corrupted.
> 2) It contains a lot of memory cycles.
> 3) It looked from the calls that this code is copying descriptors,
> so the transfer length is probably 1 or 2 words - so the loop
> is inefficient.
> 4) ppc doesn't have a fast byteswap instruction (very new gcc might
> use the byteswapping memery access for the le32_to_cpu() though),
> so it would be better getting the byteswap done inside
> __iowrite64_copy() - since that is probably requesting a byteswap
> anyway.
> OTOH I'm not at all clear about the 64bit xfers....
And it's just plain wrong anyway. You should never have to byteswap a
copy.
Ben.
^ permalink raw reply
* Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is enabled
From: Benjamin Herrenschmidt @ 2011-10-09 7:25 UTC (permalink / raw)
To: Eli Cohen
Cc: Thadeu Lima de Souza Cascardo, Yevgeny Petrilin,
netdev@vger.kernel.org, Eli Cohen, linuxppc-dev
In-Reply-To: <20111006135759.GH2681@mtldesk30>
On Thu, 2011-10-06 at 15:57 +0200, Eli Cohen wrote:
> On Wed, Oct 05, 2011 at 10:15:02AM +0200, Eli Cohen wrote:
>
> How about this patch - can you give it a try?
>
>
> >From dee60547aa9e35a02835451d9e694cd80dd3072f Mon Sep 17 00:00:00 2001
> From: Eli Cohen <eli@mellanox.co.il>
> Date: Thu, 6 Oct 2011 15:50:02 +0200
> Subject: [PATCH] mlx4_en: Fix blue flame on powerpc
>
> The source buffer used for copying into the blue flame register is already in
> big endian. However, when copying to device on powerpc, the endianess is
> swapped so the data reaches th device in little endian which is wrong. On x86
> based platform no swapping occurs so it reaches the device with the correct
> endianess. Fix this by calling le32_to_cpu() on the buffer. On LE systems there
> is no change; on BE there will be a swap.
That looks wrong.
What is this __iowrite64_copy... oh I see
Nice, somebody _AGAIN_ added a bunch of "generic" IO accessors that are
utterly wrong on all archs except x86 (ok, -almost-). There isn't a
single bloody memory barrier in there !
So, __iowrite64_copy is doing raw_writel which will -not- swap, so your
buffer is going to have the same endianness in the destination than it
has in the source. This is _NOT_ the right place to do a swap.
It's the original construction of the descriptor that needs change. The
data itself should never need to be affected accross a copy operation
(unless your HW is terminally busted).
Cheers,
Ben.
> Signed-off-by: Eli Cohen <eli@mellanox.co.il>
> ---
> drivers/net/mlx4/en_tx.c | 10 ++++++++++
> 1 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/mlx4/en_tx.c b/drivers/net/mlx4/en_tx.c
> index 16337fb..3743acc 100644
> --- a/drivers/net/mlx4/en_tx.c
> +++ b/drivers/net/mlx4/en_tx.c
> @@ -601,6 +601,16 @@ u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb)
>
> static void mlx4_bf_copy(unsigned long *dst, unsigned long *src, unsigned bytecnt)
> {
> + int i;
> + __le32 *psrc = (__le32 *)src;
> +
> + /*
> + * the buffer is already in big endian. For little endian machines that's
> + * fine. For big endain machines we must swap since the chipset swaps again
> + */
> + for (i = 0; i < bytecnt / 4; ++i)
> + psrc[i] = le32_to_cpu(psrc[i]);
> +
> __iowrite64_copy(dst, src, bytecnt / 8);
> }
>
> --
> 1.7.7.rc0.70.g82660
>
>
>
> > On Tue, Oct 04, 2011 at 05:26:20PM -0300, Thadeu Lima de Souza Cascardo wrote:
> >
> > I believe we have an endianess problem here. The source buffer is in
> > big endian - in x86 archs, it will rich the pci device unswapped since
> > both x86 and pci are little endian. In ppc, it wil be swapped by the
> > chipset so it will reach the device in little endian which is wrong.
> > So, in mlx4_bf_copy, you could loop over the buffer and swap32 the all
> > the dwords before the call to __iowrite64_copy. Of course which should
> > fix this in an arch independent manner. Let me know this works for
> > you.
> >
> > > On Tue, Oct 04, 2011 at 08:02:12AM +0200, Benjamin Herrenschmidt wrote:
> > > > On Mon, 2011-10-03 at 17:53 -0300, Thadeu Lima de Souza Cascardo wrote:
> > > >
> > > > .../...
> > > >
> > > > > > Can you also send me the output of ethtool -i?
> > > > > > It seems that there is a problem with write combining on Power processors, we will check this issue.
> > > > > >
> > > > > > Yevgeny
> > > > >
> > > > > Hello, Yevgeny.
> > > > >
> > > > > You will find the output of ethtool -i below.
> > > > >
> > > > > I am copying Ben and powerpc list, in case this is an issue with Power
> > > > > processors. They can provide us some more insight into this.
> > > >
> > > > May I get some background please ? :-)
> > > >
> > > > I'm not aware of a specific issue with write combining but I'd need to
> > > > know more about what you are doing and the code to do it to comment on
> > > > whether it should work or not.
> > > >
> > > > Cheers,
> > > > Ben.
> > > >
> > > >
> > >
> > > Hello, Ben.
> > >
> > > Sorry for that. I am testing mlx4_en driver on a POWER. Yevgeny has
> > > added blue frame support, that does not require writing to the device
> > > memory to indicate a new packet (the doorbell register as it is called).
> > >
> > > Well, the ring is getting full with no interrupt or packets transmitted.
> > > I simply added a write to the doorbell register and it works for me.
> > > Yevgeny says this is not the right fix, claiming there is a problem with
> > > write combining on POWER. The code uses memory barriers, so I don't know
> > > why there is any problem.
> > >
> > > I am posting the code here to show better what the situation is.
> > > Yevgeny can tell more about the device and the driver.
> > >
> > > The code below is the driver as of now, including a diff with what I
> > > changed and had resulted OK for me. Before the blue frame support, the
> > > only code executed was the else part. I can't tell much what the device
> > > should be seeing and doing after the blue frame part of the code is
> > > executed. But it does send the packet if I write to the doorbell
> > > register.
> > >
> > > Yevgeny, can you tell us what the device should be doing and why you
> > > think this is a problem on POWER? Is it possible that this is simply a
> > > problem with the firmware version?
> > >
> > > Thanks,
> > > Cascardo.
> > >
> > > ---
> > > if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
> > > !vlan_tag) {
> > > *(u32 *) (&tx_desc->ctrl.vlan_tag) |=
> > > ring->doorbell_qpn;
> > > op_own |= htonl((bf_index & 0xffff) << 8);
> > > /* Ensure new descirptor hits memory
> > > * before setting ownership of this descriptor to HW */
> > > wmb();
> > > tx_desc->ctrl.owner_opcode = op_own;
> > >
> > > wmb();
> > >
> > > mlx4_bf_copy(ring->bf.reg + ring->bf.offset, (unsigned
> > > long *) &tx_desc->ctrl,
> > > desc_size);
> > >
> > > wmb();
> > >
> > > ring->bf.offset ^= ring->bf.buf_size;
> > > } else {
> > > /* Ensure new descirptor hits memory
> > > * before setting ownership of this descriptor to HW */
> > > wmb();
> > > tx_desc->ctrl.owner_opcode = op_own;
> > > - wmb();
> > > - writel(ring->doorbell_qpn, ring->bf.uar->map +
> > > MLX4_SEND_DOORBELL);
> > > }
> > >
> > > + wmb();
> > > + writel(ring->doorbell_qpn, ring->bf.uar->map +
> > > MLX4_SEND_DOORBELL);
> > > +
> > > ---
^ permalink raw reply
* Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is enabled
From: Benjamin Herrenschmidt @ 2011-10-09 7:21 UTC (permalink / raw)
To: Eli Cohen
Cc: Thadeu Lima de Souza Cascardo, Yevgeny Petrilin,
netdev@vger.kernel.org, Eli Cohen, linuxppc-dev
In-Reply-To: <20111005081502.GB2681@mtldesk30>
On Wed, 2011-10-05 at 10:15 +0200, Eli Cohen wrote:
> On Tue, Oct 04, 2011 at 05:26:20PM -0300, Thadeu Lima de Souza Cascardo wrote:
>
> I believe we have an endianess problem here. The source buffer is in
> big endian - in x86 archs, it will rich the pci device unswapped since
> both x86 and pci are little endian. In ppc, it wil be swapped by the
> chipset
^^^^^^^ ugh ?
> so it will reach the device in little endian which is wrong.
> So, in mlx4_bf_copy, you could loop over the buffer and swap32 the all
> the dwords before the call to __iowrite64_copy. Of course which should
> fix this in an arch independent manner. Let me know this works for
> you.
That's generally the wrong way to handle endian (to swap32 a whole
buffer).
But I need to know more about the structure of those descriptors etc...
to judge properly.
Cheers,
Ben.
> > On Tue, Oct 04, 2011 at 08:02:12AM +0200, Benjamin Herrenschmidt wrote:
> > > On Mon, 2011-10-03 at 17:53 -0300, Thadeu Lima de Souza Cascardo wrote:
> > >
> > > .../...
> > >
> > > > > Can you also send me the output of ethtool -i?
> > > > > It seems that there is a problem with write combining on Power processors, we will check this issue.
> > > > >
> > > > > Yevgeny
> > > >
> > > > Hello, Yevgeny.
> > > >
> > > > You will find the output of ethtool -i below.
> > > >
> > > > I am copying Ben and powerpc list, in case this is an issue with Power
> > > > processors. They can provide us some more insight into this.
> > >
> > > May I get some background please ? :-)
> > >
> > > I'm not aware of a specific issue with write combining but I'd need to
> > > know more about what you are doing and the code to do it to comment on
> > > whether it should work or not.
> > >
> > > Cheers,
> > > Ben.
> > >
> > >
> >
> > Hello, Ben.
> >
> > Sorry for that. I am testing mlx4_en driver on a POWER. Yevgeny has
> > added blue frame support, that does not require writing to the device
> > memory to indicate a new packet (the doorbell register as it is called).
> >
> > Well, the ring is getting full with no interrupt or packets transmitted.
> > I simply added a write to the doorbell register and it works for me.
> > Yevgeny says this is not the right fix, claiming there is a problem with
> > write combining on POWER. The code uses memory barriers, so I don't know
> > why there is any problem.
> >
> > I am posting the code here to show better what the situation is.
> > Yevgeny can tell more about the device and the driver.
> >
> > The code below is the driver as of now, including a diff with what I
> > changed and had resulted OK for me. Before the blue frame support, the
> > only code executed was the else part. I can't tell much what the device
> > should be seeing and doing after the blue frame part of the code is
> > executed. But it does send the packet if I write to the doorbell
> > register.
> >
> > Yevgeny, can you tell us what the device should be doing and why you
> > think this is a problem on POWER? Is it possible that this is simply a
> > problem with the firmware version?
> >
> > Thanks,
> > Cascardo.
> >
> > ---
> > if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
> > !vlan_tag) {
> > *(u32 *) (&tx_desc->ctrl.vlan_tag) |=
> > ring->doorbell_qpn;
> > op_own |= htonl((bf_index & 0xffff) << 8);
> > /* Ensure new descirptor hits memory
> > * before setting ownership of this descriptor to HW */
> > wmb();
> > tx_desc->ctrl.owner_opcode = op_own;
> >
> > wmb();
> >
> > mlx4_bf_copy(ring->bf.reg + ring->bf.offset, (unsigned
> > long *) &tx_desc->ctrl,
> > desc_size);
> >
> > wmb();
> >
> > ring->bf.offset ^= ring->bf.buf_size;
> > } else {
> > /* Ensure new descirptor hits memory
> > * before setting ownership of this descriptor to HW */
> > wmb();
> > tx_desc->ctrl.owner_opcode = op_own;
> > - wmb();
> > - writel(ring->doorbell_qpn, ring->bf.uar->map +
> > MLX4_SEND_DOORBELL);
> > }
> >
> > + wmb();
> > + writel(ring->doorbell_qpn, ring->bf.uar->map +
> > MLX4_SEND_DOORBELL);
> > +
> > ---
^ permalink raw reply
* Re: [PATCH] mlx4_en: fix transmit of packages when blue frame is enabled
From: Benjamin Herrenschmidt @ 2011-10-09 7:19 UTC (permalink / raw)
To: Thadeu Lima de Souza Cascardo
Cc: netdev@vger.kernel.org, Eli Cohen, eli@dev.mellanox.co.il,
linuxppc-dev, Yevgeny Petrilin
In-Reply-To: <20111004202620.GA3455@oc1711230544.ibm.com>
On Tue, 2011-10-04 at 17:26 -0300, Thadeu Lima de Souza Cascardo wrote:
> if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
> !vlan_tag) {
> *(u32 *) (&tx_desc->ctrl.vlan_tag) |=
> ring->doorbell_qpn;
Could this have endianness problems ?
> op_own |= htonl((bf_index & 0xffff) << 8);
Probably better to use cpu_to_be/lexx() here. Also make sure your
descriptors are defined with the appropriate __beXX or __leXX types
so sparse can tell you when you get this wrong
> /* Ensure new descirptor hits memory
> * before setting ownership of this descriptor to HW */
> wmb();
> tx_desc->ctrl.owner_opcode = op_own;
> wmb();
>
> mlx4_bf_copy(ring->bf.reg + ring->bf.offset, (unsigned
> long *) &tx_desc->ctrl,
> desc_size);
What does the above do ?
> wmb();
>
> ring->bf.offset ^= ring->bf.buf_size;
Is this HW visible ? It's a bit odd, are you doing double bufferring and
trying to flip a bit ? If it's HW visible, is endian correct ?
} else {
> /* Ensure new descirptor hits memory
> * before setting ownership of this descriptor to HW */
> wmb();
> tx_desc->ctrl.owner_opcode = op_own;
> - wmb();
> - writel(ring->doorbell_qpn, ring->bf.uar->map +
> MLX4_SEND_DOORBELL);
> }
>
> + wmb();
> + writel(ring->doorbell_qpn, ring->bf.uar->map +
> MLX4_SEND_DOORBELL);
> +
> ---
Cheers,
Ben.
^ permalink raw reply
* raw ethenet socket question
From: Ronny Meeus @ 2011-10-08 20:20 UTC (permalink / raw)
To: netdev
Hello
I'm doing some tests on a raw Ethernet socket and I observe some
strange behavior.
My system is a FreeScale P4040, running Linux 2.6.36.4 compiled for
SMP mode but only 1 core activated.
[ 0.000000] Using P4080 DS machine description
[ 0.000000] Memory CAM mapping: 256/256/256 Mb, residual: 1248Mb
[ 0.000000] Linux version 2.6.36.4 (meeusr@devws108) (gcc version
4.4.6 (Buildroot 2011.08-hgc574811c3fc5) ) #1 SMP Sat Oct 8 20:40:40
CEST 2011
I basically have one of the Ethernet ports in a loopmode, which means
that all packets sent to the port will be received on the same port.
I want to check the amount of packets I can send/receive on my board,
so there a large loop to send/receive packets (see code below).
To stress the system a bit more, I send a number of packets before I
start to receive packets.
If I send 10 or less packets at a time, I do not see issues (see for
(j=0;j<10;j++)), but if I send for example 16 packets before starting
to receive, I always see packet loss.
For example if I send 1000 times 16 packets, I only receive 12000
packets, if I send 1000 times 20 packets, I receive 16000 packets.
I also checked the ifconfig statistics and the counters for Rx and Tx
are always identical and equal to the amount of packets that were
sent. So it looks like the packets are getting lost in the linux
kernel of in my test application.
Can somebody explain this behavior?
Is there a fixed amount of Ethernet packets that are queue in a socket?
Test code:
for (i=0;i<packets_to_send;i++)
{
fd_set readset;
struct timeval tv;
FD_ZERO(&readset);
FD_SET(eth_sock,&readset);
for (j=0;j<10;j++)
{
if (sendto(eth_sock,packet,packet_size, 0,(struct
sockaddr*)eth_dest, sizeof(struct sockaddr_ll)) > 0)
packet_count++;
}
tv.tv_sec = 0;
tv.tv_usec = 500;
while (select(eth_sock+1,&readset,0,0,&tv) == 1) {
int len = recvfrom(eth_sock,recvdata,sizeof(recvdata),0,NULL,NULL);
if (len>0) rcv_count++;
tv.tv_usec = 500;
}
printf("packet sent: %10ld packets received:
%10ld\r",packet_count,rcv_count);
}
This is how I create my socket:
int create_raw_eth_socket(void)
{
int eth_sock;
eth_dest.sll_family = PF_PACKET;
eth_dest.sll_protocol = htons(ETH_P_ALL);
eth_dest.sll_ifindex = itf_ifindex;
eth_dest.sll_hatype = ARPHRD_ETHER;
eth_dest.sll_pkttype = PACKET_OTHERHOST;
eth_dest.sll_halen = ETH_ALEN;
eth_sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
bind(eth_sock,(struct sockaddr*)ð_dest,sizeof(eth_dest));
return eth_sock;
}
Regards,
Ronny
^ permalink raw reply
* Re: [BUG] igb : rtnl assert on resume
From: Eric Dumazet @ 2011-10-08 20:16 UTC (permalink / raw)
To: jeffrey.t.kirsher; +Cc: David Miller, netdev
In-Reply-To: <1318102192.5276.27.camel@edumazet-laptop>
Le samedi 08 octobre 2011 à 21:29 +0200, Eric Dumazet a écrit :
> Le samedi 08 octobre 2011 à 11:26 -0700, Jeff Kirsher a écrit :
>
> > Any chance you can pull my net-next tree Eric to verify if the issue
> > still exists?
>
> Sure, I'll do that.
>
Same error with your changes as well.
No hurry, maybe the RTNL assert can be relaxed.
^ permalink raw reply
* Re: [net-next 02/11] igb: Use node specific allocations for the q_vectors and rings
From: David Miller @ 2011-10-08 19:51 UTC (permalink / raw)
To: jeffrey.t.kirsher; +Cc: alexander.h.duyck, netdev, gospo, sassmann
In-Reply-To: <1318056461-19562-3-git-send-email-jeffrey.t.kirsher@intel.com>
From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Fri, 7 Oct 2011 23:47:32 -0700
> From: Alexander Duyck <alexander.h.duyck@intel.com>
>
> This change is meant to update the ring and vector allocations so that they
> are per node instead of allocating everything on the node that
> ifconfig/modprobe is called on. By doing this we can cut down
> significantly on cross node traffic.
>
> Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
> Tested-by: Aaron Brown <aaron.f.brown@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
adapter->node seems superfluous.
It's always "-1" when we enter the allocation functions, and we
always restore it to it's original value upon exit from such
functions.
Just get rid of it and use a local variable in these functions
to keep track of the current allocation node.
Also, what ensures that MSI-X interrupts are targetted to a cpu
on the the node where you've made these allocations? I was
pretty sure Ben Hutchings added infrastructure that's usable
to ensure this, but I can't see where you're using it.
^ permalink raw reply
* Re: [BUG] igb : rtnl assert on resume
From: Eric Dumazet @ 2011-10-08 19:29 UTC (permalink / raw)
To: jeffrey.t.kirsher; +Cc: David Miller, netdev
In-Reply-To: <1318098396.23688.169.camel@jtkirshe-mobl>
Le samedi 08 octobre 2011 à 11:26 -0700, Jeff Kirsher a écrit :
> Any chance you can pull my net-next tree Eric to verify if the issue
> still exists?
Sure, I'll do that.
In the meantime, I upgraded my (slow, old) machine to ubuntu 11.11, and
reproduced the problem on their 3.0.something kernel.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next.git
>
> I currently have 11 igb patches on that tree (which I recently
> submitted) that are not in Dave's tree yet.
>
> There have been a number of cleanup's recently, so while this is not
> expected, I am not surprised at the same time since I am in the middle
> of the update to igb.
>
> We have not seen this on my local tree (which has the 11 patches plus
> 4-5 more patches for igb). Almost all of them are
> cleanup's/re-organizing of igb, so nothing specific to the issue you
> have seen.
Thanks
^ permalink raw reply
* Re: e100 + VLANs?
From: Jeff Kirsher @ 2011-10-08 18:34 UTC (permalink / raw)
To: Eric Dumazet; +Cc: Michael Tokarev, netdev
In-Reply-To: <1318091046.5276.22.camel@edumazet-laptop>
[-- Attachment #1: Type: text/plain, Size: 1968 bytes --]
On 10/08/2011 09:24 AM, Eric Dumazet wrote:
> Le samedi 08 octobre 2011 à 14:08 +0400, Michael Tokarev a écrit :
>> > Yesterday I tried to use 802.1Q VLAN tagging with an (oldish)
>> > e100-driven network card, identified by lspci like this:
>> >
>> > 00:12.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 (rev 02)
>> >
>> > Just to discover that it does not quite work: packets of
>> > size 1497+ bytes gets lost.
>> >
>> > This appears to be a classical problems in this case -
>> > something forgot to allocate extra 4 bytes for the
>> > packets.
>> >
>> > There's at least one bugreport from 2008 (!) about this
>> > very issue: http://bugs.centos.org/view.php?id=2719
>> > which is still open.
>> >
>> > The kernel I tried this on was 2.6.32, I checked git log
>> > for drivers/net/e100.c - there was no changes up to
>> > current version which may be related to this issue.
>> >
>> > The question: is this a driver problem or hardware? If
>> > it's the driver, can it be fixed? And if it's hardware,
>> > can the driver notify the user somehow - like, by refusing
>> > to enable VLAN (sub)devices maybe?
>> >
>> > Yesterday it was actually a bit more complicated for me,
>> > since the card in question was used to connect to our
>> > ISP, and they use fixed MAC address per port, so I had
>> > to find another NIC which is a) able to work with VLAN
>> > tags properly, and b) is able to change its mac address.
>> > Lucky I had a VIA RhineIII which does both :)
>> >
> Since you have two cards (and probably two machines), maybe you could
> try to track if the problem is a bad transmit or a bad receive ?
>
> tcpdump on both machines, and ping -s 2000 from both sides...
>
> e100 driver seems VLAN enabled at a first glance.
Eric is correct, that e100 does support VLANs.
In addition to Eric's suggestion, can you also provide all the output of
lspci -vvv for the network card?
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^ permalink raw reply
* Re: [BUG] igb : rtnl assert on resume
From: Jeff Kirsher @ 2011-10-08 18:26 UTC (permalink / raw)
To: Eric Dumazet; +Cc: David Miller, netdev
In-Reply-To: <1318096284.5276.25.camel@edumazet-laptop>
[-- Attachment #1: Type: text/plain, Size: 2309 bytes --]
On Sat, 2011-10-08 at 10:51 -0700, Eric Dumazet wrote:
> Hi guys
>
> Not sure if its a regression (it seems linux-3.0 probably should trigger
> same trace) but I caught this on latest net-next when suspend/resume
> cycle was done :
>
> [ 5279.891512] RTNL: assertion failed at net/core/dev.c (1665)
> [ 5279.891515] Pid: 2785, comm: kworker/u:9 Not tainted 3.1.0-rc9+ #81
> [ 5279.891517] Call Trace:
> [ 5279.891523] [<ffffffff814802ec>] netif_set_real_num_tx_queues+0x1ac/0x1c0
> [ 5279.891540] [<ffffffffa00244d1>] igb_init_interrupt_scheme+0x151/0x4b0 [igb]
> [ 5279.891546] [<ffffffffa002984d>] igb_resume+0x9d/0x160 [igb]
> [ 5279.891550] [<ffffffff812e0b91>] pci_legacy_resume+0x41/0x60
> [ 5279.891552] [<ffffffff812e17c0>] pci_pm_resume+0x90/0xd0
> [ 5279.891555] [<ffffffff813896b7>] pm_op+0xe7/0x1c0
> [ 5279.891558] [<ffffffff81389ba7>] device_resume+0xf7/0x1b0
> [ 5279.891561] [<ffffffff8108a520>] ? async_schedule+0x20/0x20
> [ 5279.891564] [<ffffffff81389c81>] async_resume+0x21/0x50
> [ 5279.891566] [<ffffffff8108a59f>] async_run_entry_fn+0x7f/0x180
> [ 5279.891569] [<ffffffff8107ca73>] process_one_work+0x123/0x480
> [ 5279.891572] [<ffffffff8107d638>] ? manage_workers.isra.30+0x1e8/0x230
> [ 5279.891574] [<ffffffff8107d7de>] worker_thread+0x15e/0x360
> [ 5279.891576] [<ffffffff8107d680>] ? manage_workers.isra.30+0x230/0x230
> [ 5279.891579] [<ffffffff8108225c>] kthread+0x8c/0xa0
> [ 5279.891583] [<ffffffff8157fc74>] kernel_thread_helper+0x4/0x10
> [ 5279.891586] [<ffffffff810821d0>] ? flush_kthread_worker+0xa0/0xa0
> [ 5279.891588] [<ffffffff8157fc70>] ? gs_change+0x13/0x13
>
> Thanks
Any chance you can pull my net-next tree Eric to verify if the issue
still exists?
git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next.git
I currently have 11 igb patches on that tree (which I recently
submitted) that are not in Dave's tree yet.
There have been a number of cleanup's recently, so while this is not
expected, I am not surprised at the same time since I am in the middle
of the update to igb.
We have not seen this on my local tree (which has the 11 patches plus
4-5 more patches for igb). Almost all of them are
cleanup's/re-organizing of igb, so nothing specific to the issue you
have seen.
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^ permalink raw reply
* [BUG] igb : rtnl assert on resume
From: Eric Dumazet @ 2011-10-08 17:51 UTC (permalink / raw)
To: Kirsher, Jeffrey T, David Miller; +Cc: netdev
Hi guys
Not sure if its a regression (it seems linux-3.0 probably should trigger
same trace) but I caught this on latest net-next when suspend/resume
cycle was done :
[ 5279.891512] RTNL: assertion failed at net/core/dev.c (1665)
[ 5279.891515] Pid: 2785, comm: kworker/u:9 Not tainted 3.1.0-rc9+ #81
[ 5279.891517] Call Trace:
[ 5279.891523] [<ffffffff814802ec>] netif_set_real_num_tx_queues+0x1ac/0x1c0
[ 5279.891540] [<ffffffffa00244d1>] igb_init_interrupt_scheme+0x151/0x4b0 [igb]
[ 5279.891546] [<ffffffffa002984d>] igb_resume+0x9d/0x160 [igb]
[ 5279.891550] [<ffffffff812e0b91>] pci_legacy_resume+0x41/0x60
[ 5279.891552] [<ffffffff812e17c0>] pci_pm_resume+0x90/0xd0
[ 5279.891555] [<ffffffff813896b7>] pm_op+0xe7/0x1c0
[ 5279.891558] [<ffffffff81389ba7>] device_resume+0xf7/0x1b0
[ 5279.891561] [<ffffffff8108a520>] ? async_schedule+0x20/0x20
[ 5279.891564] [<ffffffff81389c81>] async_resume+0x21/0x50
[ 5279.891566] [<ffffffff8108a59f>] async_run_entry_fn+0x7f/0x180
[ 5279.891569] [<ffffffff8107ca73>] process_one_work+0x123/0x480
[ 5279.891572] [<ffffffff8107d638>] ? manage_workers.isra.30+0x1e8/0x230
[ 5279.891574] [<ffffffff8107d7de>] worker_thread+0x15e/0x360
[ 5279.891576] [<ffffffff8107d680>] ? manage_workers.isra.30+0x230/0x230
[ 5279.891579] [<ffffffff8108225c>] kthread+0x8c/0xa0
[ 5279.891583] [<ffffffff8157fc74>] kernel_thread_helper+0x4/0x10
[ 5279.891586] [<ffffffff810821d0>] ? flush_kthread_worker+0xa0/0xa0
[ 5279.891588] [<ffffffff8157fc70>] ? gs_change+0x13/0x13
Thanks
^ permalink raw reply
* Re: e100 + VLANs?
From: Eric Dumazet @ 2011-10-08 16:24 UTC (permalink / raw)
To: Michael Tokarev; +Cc: netdev
In-Reply-To: <4E90212D.8030009@msgid.tls.msk.ru>
Le samedi 08 octobre 2011 à 14:08 +0400, Michael Tokarev a écrit :
> Yesterday I tried to use 802.1Q VLAN tagging with an (oldish)
> e100-driven network card, identified by lspci like this:
>
> 00:12.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 (rev 02)
>
> Just to discover that it does not quite work: packets of
> size 1497+ bytes gets lost.
>
> This appears to be a classical problems in this case -
> something forgot to allocate extra 4 bytes for the
> packets.
>
> There's at least one bugreport from 2008 (!) about this
> very issue: http://bugs.centos.org/view.php?id=2719
> which is still open.
>
> The kernel I tried this on was 2.6.32, I checked git log
> for drivers/net/e100.c - there was no changes up to
> current version which may be related to this issue.
>
> The question: is this a driver problem or hardware? If
> it's the driver, can it be fixed? And if it's hardware,
> can the driver notify the user somehow - like, by refusing
> to enable VLAN (sub)devices maybe?
>
> Yesterday it was actually a bit more complicated for me,
> since the card in question was used to connect to our
> ISP, and they use fixed MAC address per port, so I had
> to find another NIC which is a) able to work with VLAN
> tags properly, and b) is able to change its mac address.
> Lucky I had a VIA RhineIII which does both :)
>
Since you have two cards (and probably two machines), maybe you could
try to track if the problem is a bad transmit or a bad receive ?
tcpdump on both machines, and ping -s 2000 from both sides...
e100 driver seems VLAN enabled at a first glance.
^ permalink raw reply
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^ permalink raw reply
* Re: SOMAXCONN = 128, but max defaults to 2048
From: Olaf van der Spek @ 2011-10-08 12:44 UTC (permalink / raw)
To: Eric Dumazet; +Cc: netdev
In-Reply-To: <1318077339.5276.17.camel@edumazet-laptop>
On Sat, Oct 8, 2011 at 2:35 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> Le samedi 08 octobre 2011 à 13:51 +0200, Olaf van der Spek a écrit :
>> Is the name of SOMAXCONN wrong and is it actually defining the default?
>> Would there be a disadvantage to defining SOMAXCONN as INT_MAX and
>> letting the kernel control the actual max?
>>
>
> You mean : remove somaxconn tunable ?
No, I mean basically removing the compile-time value and only using
the run-time value (from the kernel).
> accept()/listen() is not bound to TCP only.
What else is that value used for?
> We had a recent discussion on the matter lately, but Hagen Paul Pfeifer
> did not polish his patches enough :
>
> http://lists.openwall.net/netdev/2011/03/20/3
Isn't it a single-line change?
Olaf
^ permalink raw reply
* Re: SOMAXCONN = 128, but max defaults to 2048
From: Eric Dumazet @ 2011-10-08 12:35 UTC (permalink / raw)
To: Olaf van der Spek; +Cc: netdev
In-Reply-To: <CAGVGHmt1OVOj0NSEo3qHCh1CR10eZTNjxuUh_mB6sXxcx5gKmA@mail.gmail.com>
Le samedi 08 octobre 2011 à 13:51 +0200, Olaf van der Spek a écrit :
> Hi,
>
> SOMAXCONN is defined as 128, but the max
> ("/proc/sys/net/ipv4/tcp_max_syn_backlog") appears to be 2048 by
> default.
It depends on memory size and TCP hash table size :
dmesg | grep "TCP established hash table entries"
-> TCP established hash table entries: 524288 (order: 11, 8388608 bytes)
sysctl_max_syn_backlog = max(128, cnt / 256);
cnt = 524288
cnt/256 -> 2048
> Is the name of SOMAXCONN wrong and is it actually defining the default?
> Would there be a disadvantage to defining SOMAXCONN as INT_MAX and
> letting the kernel control the actual max?
>
You mean : remove somaxconn tunable ?
accept()/listen() is not bound to TCP only.
But yes, 128 default is a bit old today, given that Apache uses a
listen(fd, 511) default value itself...
I routinely set net.core.somaxconn to 1024 on my servers.
We had a recent discussion on the matter lately, but Hagen Paul Pfeifer
did not polish his patches enough :
http://lists.openwall.net/netdev/2011/03/20/3
FreeBSD has a separate mechanism for not yet established sockets, called
syncache, that allows a low somaxconn per listener.
The socket queue holds only fully established (but not yet accept()ed)
sockets, while syncache holds all the SYN_RECV ones.
^ permalink raw reply
* SOMAXCONN = 128, but max defaults to 2048
From: Olaf van der Spek @ 2011-10-08 11:51 UTC (permalink / raw)
To: netdev
Hi,
SOMAXCONN is defined as 128, but the max
("/proc/sys/net/ipv4/tcp_max_syn_backlog") appears to be 2048 by
default.
Is the name of SOMAXCONN wrong and is it actually defining the default?
Would there be a disadvantage to defining SOMAXCONN as INT_MAX and
letting the kernel control the actual max?
Greetings,
Olaf
^ permalink raw reply
* Re: [RFC] net: remove erroneous sk null assignment in timestamping
From: Richard Cochran @ 2011-10-08 10:35 UTC (permalink / raw)
To: Eric Dumazet; +Cc: Johannes Berg, David Miller, netdev
In-Reply-To: <1318064238.5276.2.camel@edumazet-laptop>
On Sat, Oct 08, 2011 at 10:57:18AM +0200, Eric Dumazet wrote:
> Le samedi 08 octobre 2011 à 10:16 +0200, Johannes Berg a écrit :
>
> > I'm not terribly familiar with struct sock. Looking at it, I'm a bit
> > confused by skb_orphan() -- it doesn't put the sock reference. So are
> > sockets not refcounted for skbs in this way? They seem to use
> > sock_wfree() which does a bit more than this it seems, and I don't see
> > it using sk_refcnt anywhere so I'm a bit confused now.
Me, too.
> Check following commit changelog to get some information on this.
Thanks, Eric, that does help explain.
> We use this sock_hold()/sock_put() so that sock freeing
> is delayed until all tx packets are completed.
>
> As we also update sk_wmem_alloc, we could offset sk_wmem_alloc
> by one unit at init time, until sk_free() is called.
> Once sk_free() is called, we atomic_dec_and_test(sk_wmem_alloc)
> to decrement initial offset and atomicaly check if any packets
> are in flight.
>
> skb_set_owner_w() doesnt call sock_hold() anymore
So, if I understand, then I can solve my particular problem by doing:
* skb_clone_tx_timestamp
clone = skb_clone(skb, GFP_ATOMIC);
skb_set_owner_w(clone, sk)
// instead of
// clone->sk = sk;
phydev->drv->txtstamp(phydev, clone, type);
* skb_complete_tx_timestamp
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
// just remove this:
// skb->sk = NULL;
err = sock_queue_err_skb(sk, skb);
The only problem(?) I see is that it violates the rules from sock.h,
quoted below. The cloned tx skb destined for the error queue would be
budgeted to sk_wmem_alloc while wait for the time stamp. But maybe we
can allow this?
from sock.h:
/*
* Socket reference counting postulates.
*
* * Each user of socket SHOULD hold a reference count.
* * Each access point to socket (an hash table bucket, reference from a list,
* running timer, skb in flight MUST hold a reference count.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/
BTW, no longer true.
* * Packets, delivered from outside (from network or from another process)
* and enqueued on receive/error queues SHOULD NOT grab reference count,
* when they sit in queue. ~~~~~~~~~~~~~~~~~~~~~~~
Want to break/bend this rule.
Thanks,
Richard
^ permalink raw reply
* Re: [RFC] net: remove erroneous sk null assignment in timestamping
From: Johannes Berg @ 2011-10-08 10:32 UTC (permalink / raw)
To: Eric Dumazet; +Cc: Richard Cochran, David Miller, netdev
In-Reply-To: <1318064238.5276.2.camel@edumazet-laptop>
On Sat, 2011-10-08 at 10:57 +0200, Eric Dumazet wrote:
> Le samedi 08 octobre 2011 à 10:16 +0200, Johannes Berg a écrit :
>
> > I'm not terribly familiar with struct sock. Looking at it, I'm a bit
> > confused by skb_orphan() -- it doesn't put the sock reference. So are
> > sockets not refcounted for skbs in this way? They seem to use
> > sock_wfree() which does a bit more than this it seems, and I don't see
> > it using sk_refcnt anywhere so I'm a bit confused now.
>
> Check following commit changelog to get some information on this.
>
> commit 2b85a34e911bf483c27cfdd124aeb1605145dc80
> Author: Eric Dumazet <eric.dumazet@gmail.com>
> Date: Thu Jun 11 02:55:43 2009 -0700
>
> net: No more expensive sock_hold()/sock_put() on each tx
Aha, thanks for the pointer!
> As we also update sk_wmem_alloc, we could offset sk_wmem_alloc
> by one unit at init time, until sk_free() is called.
This is the trick! Neat. I see it now, now sk_free() makes sense to
me :-)
There's one thing I still miss though: It seems to me that if you have a
reference to a socket that has been sk_free()'ed (which is possible
since it might still have sk_wmem_alloc > 0) you can't sock_hold() that
socket. That feels a bit unexpected -- and might happen in the code
Richard just suggested.
Basically, while you can bump a reference you own via sock_hold() by
sk_wmem_alloc, as soon as sk_refcnt reaches 0 it must never go > 0 again
because that will have released the sk_wmem_alloc offset.
That can be fixed, but I'm not exactly sure what would be an efficient
way of doing it. Maybe by adding some flag that says whether or not the
sk_wmem_alloc offset is present, but that flag would have to be atomic
since I guess even this could race.
> Drawback is that a skb->truesize error could lead to unfreeable sockets, or
> even worse, prematurely calling __sk_free() on a live socket.
I was thinking about this yesterday as well. What we could do is wrap
all the skb truesize operations in inlines -- the regular ones like
skb_truesize_set()/add()/sub() would (depending on a debug Kconfig)
check that the skb isn't charged to a socket, and common sequences like
changing truesize and updating the sock could be wrapped into another
set of inlines that do both. Or something like that.
I was actually thinking about this for other reasons but then realised
that with the truesize bug check gone (which was really checking
something else) I didn't really need to worry any more.
johannes
^ permalink raw reply
* [PATCH net] vlan:make mtu of vlan equal to physical dev
From: Weiping Pan @ 2011-10-08 10:12 UTC (permalink / raw)
To: netdev; +Cc: Weiping Pan
Default mtu of vlan device is the same with mtu of physical device,
for example 1500, but when change physics mtu to 1600,
VLAN device's mtu is still 1500.
Certainly, you can change vlan device's mtu to 1600 manually,
but I think when you change physics device's mtu, VLAN's mtu should be changed
automatically instead of by manually.
Steps to Reproduce:
1.vconfig add eth4 3
2.ifconfig eth4 mtu 1600
3.check mtu on eth4.3
And what's worse is that if you decrease mtu of pyhsical device,
and when you want to increase it, the mtu of vlan device won't be changed.
Steps to Reproduce:
1.vconfig add eth4 3
2.ifconfig eth4 mtu 100
3.ifconfig eth4 mtu 1500
4.the mtu of eth4.3 is still 100
This bug is reported by Liang Zheng(lzheng@redhat.com).
Signed-off-by: Weiping Pan <panweiping3@gmail.com>
---
net/8021q/vlan.c | 3 ---
1 files changed, 0 insertions(+), 3 deletions(-)
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 8970ba1..f6072b4 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -417,9 +417,6 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
if (!vlandev)
continue;
- if (vlandev->mtu <= dev->mtu)
- continue;
-
dev_set_mtu(vlandev, dev->mtu);
}
break;
--
1.7.4.4
^ permalink raw reply related
* e100 + VLANs?
From: Michael Tokarev @ 2011-10-08 10:08 UTC (permalink / raw)
To: netdev
Yesterday I tried to use 802.1Q VLAN tagging with an (oldish)
e100-driven network card, identified by lspci like this:
00:12.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 (rev 02)
Just to discover that it does not quite work: packets of
size 1497+ bytes gets lost.
This appears to be a classical problems in this case -
something forgot to allocate extra 4 bytes for the
packets.
There's at least one bugreport from 2008 (!) about this
very issue: http://bugs.centos.org/view.php?id=2719
which is still open.
The kernel I tried this on was 2.6.32, I checked git log
for drivers/net/e100.c - there was no changes up to
current version which may be related to this issue.
The question: is this a driver problem or hardware? If
it's the driver, can it be fixed? And if it's hardware,
can the driver notify the user somehow - like, by refusing
to enable VLAN (sub)devices maybe?
Yesterday it was actually a bit more complicated for me,
since the card in question was used to connect to our
ISP, and they use fixed MAC address per port, so I had
to find another NIC which is a) able to work with VLAN
tags properly, and b) is able to change its mac address.
Lucky I had a VIA RhineIII which does both :)
Thanks,
/mjt
^ permalink raw reply
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^ permalink raw reply
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