netlink-socket: Fix nl_sock_recv__() on Windows.

In nl_sock_recv__() on Windows, we realloc a new ofpbuf to copy received
data if the caller specified buffer is small. While we do so, we need
reset some of the other stack variables to point to the new ofpbuf.

Other fixes are around using 'error' rather than 'errno'.

Signed-off-by: Nithin Raju <nithin@vmware.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath: net: make skb_gso_segment error handling more robust

skb_gso_segment has three possible return values:
1. a pointer to the first segmented skb
2. an errno value (IS_ERR())
3. NULL.  This can happen when GSO is used for header verification.

However, several callers currently test IS_ERR instead of IS_ERR_OR_NULL
and would oops when NULL is returned.

Note that these call sites should never actually see such a NULL return
value; all callers mask out the GSO bits in the feature argument.

However, there have been issues with some protocol handlers erronously not
respecting the specified feature mask in some cases.

It is preferable to get 'have to turn off hw offloading, else slow' reports
rather than 'kernel crashes'.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Use magic ETH_ADDR_LEN instead of 6 for Ethernet address length.

ETH_ADDR_LEN is defined in lib/packets.h, valued 6.
Use this macro instead of magic number 6 to represent the length
of eth mac address.

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath-windows: Return success when duplicate flow is added.

If we are trying to insert a flow while there's already a key with the
same flow, return success instead of failure. It can be argued that we
should probably return a transactional error EEXIST, but we'll handle
this in a subsequent commit. I've added a comment to address this later.

Signed-off-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Eitan Eliahu <eliahue@vmware.com>
netlink-socket: Use poll_immediate_wake() on Windows.

We have not yet tested the wakup via pending IRP functionality on
Windows yet. Hence we use poll_immediate_wake().

Signed-off-by: Nithin Raju <nithin@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Eitan Eliahu <eliahue@vmware.com>
Build: shared libraries and versioning

These changes cause shared libraries to be built by default. In
particular, lib/libopenvwitch.so, lib/libsflow.so,
ofproto/libofproto.so, and ovsdb/libovsdb.so will be built. Original
behavior of building static objects excusively may be accomplished by
providing the --disable-shared argument to configure.

Additionally, versioning is introduced to each of the libraries objects
paving the way for APIs to be built around them. A detailed comment
outlining the rules for changing a version number is provided in
configure.ac. Note that at this time, the version number is set to
1.0.0, no API is specified yet, and there are no requirements to maintain
any sort of compatibility in any of the libraries.

Signed-off-by: Scott Mann <smann@noironetworks.com>