Skip to content

L
linux
Switch branch/tag
  1. 24 Aug, 2012 7 commits
    • Ben Hutchings's avatar
      sfc: Simplify TSO header buffer allocation · f7251a9c
      Ben Hutchings authored 
      TSO header buffers contain a control structure immediately followed by
the packet headers, and are kept on a free list when not in use.  This
complicates buffer management and tends to result in cache read misses
when we recycle such buffers (particularly if DMA-coherent memory
requires caches to be disabled).

Replace the free list with a simple mapping by descriptor index.  We
know that there is always a payload descriptor between any two
descriptors with TSO header buffers, so we can allocate only one
such buffer for each two descriptors.

While we're at it, use a standard error code for allocation failure,
not -1.
Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
      f7251a9c
    • Ben Hutchings's avatar
      sfc: Stop TX queues before they fill up · 14bf718f
      Ben Hutchings authored 
      We now have a definite upper bound on the number of descriptors per
skb; use that to stop the queue when the next packet might not fit.
Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
      14bf718f
    • Ben Hutchings's avatar
      sfc: Refactor struct efx_tx_buffer to use a flags field · 7668ff9c
      Ben Hutchings authored 
      Add a flags field to struct efx_tx_buffer, replacing the
continuation and map_single booleans.

Since a single descriptor cannot be both a TSO header and the last
descriptor for an skb, unionise efx_tx_buffer::{skb,tsoh} and add
flags for validity of these fields.

Clear all flags in free buffers (whereas previously the continuation
flag would be set).
Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
      7668ff9c
    • Ben Hutchings's avatar
      net: Set device operstate at registration time · 8f4cccbb
      Ben Hutchings authored 
      The operstate of a device is initially IF_OPER_UNKNOWN and is updated
asynchronously by linkwatch after each change of carrier state
reported by the driver.  The default carrier state of a net device is
on, and this will never be changed on drivers that do not support
carrier detection, thus the operstate remains IF_OPER_UNKNOWN.

For devices that do support carrier detection, the driver must set the
carrier state to off initially, then poll the hardware state when the
device is opened.  However, we must not activate linkwatch for a
unregistered device, and commit b4730016 ('net: Do not fire linkwatch
events until the device is registered.') ensured that we don't.  But
this means that the operstate for many devices that support carrier
detection remains IF_OPER_UNKNOWN when it should be IF_OPER_DOWN.

The same issue exists with the dormant state.

The proper initialisation sequence, avoiding a race with opening of
the device, is:

        rtnl_lock();
        rc = register_netdevice(dev);
        if (rc)
                goto out_unlock;
        netif_carrier_off(dev); /* or netif_dormant_on(dev) */
        rtnl_unlock();

but it seems silly that this should have to be repeated in so many
drivers.  Further, the operstate seen immediately after opening the
device may still be IF_OPER_UNKNOWN due to the asynchronous nature of
linkwatch.

Commit 22604c86 ('net: Fix for initial link state in 2.6.28') attempted
to fix this by setting the operstate synchronously, but it was
reverted as it could lead to deadlock.

This initialises the operstate synchronously at registration time
only.
Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8f4cccbb
    • Timur Tabi's avatar
      net/fsl: introduce Freescale 10G MDIO driver · 9f35a734
      Timur Tabi authored 
      Similar to fsl_pq_mdio.c, this driver is for the 10G MDIO controller on
Freescale Frame Manager Ethernet controllers.
Signed-off-by: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9f35a734
    • Neil Horman's avatar
      cls_cgroup: Allow classifier cgroups to have their classid reset to 0 · 3afa6d00
      Neil Horman authored 
      The network classifier cgroup initalizes each cgroups instance classid value to
0.  However, the sock_update_classid function only updates classid's in sockets
if the tasks cgroup classid is not zero, and if it differs from the current
classid.  The later check is to prevent cache line dirtying, but the former is
detrimental, as it prevents resetting a classid for a cgroup to 0.  While this
is not a common action, it has administrative usefulness (if the admin wants to
disable classification of a certain group temporarily for instance).

Easy fix, just remove the zero check.  Tested successfully by myself
Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3afa6d00
    • David S. Miller's avatar
      Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge · e6e94e39
      David S. Miller authored 
      Antonio Quartulli says:

====================
Included changes:
- a set of codestyle rearrangements/fixes
- new feature to early detect new joining (mesh-unaware) clients
- a minor fix for the gw-feature
- substitution of shift operations with the BIT() macro
- reorganization of the main batman-adv structure (struct batadv_priv)
- some more (very) minor cleanups and fixes
===================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e6e94e39
  3. 23 Aug, 2012 29 commits
  5. 22 Aug, 2012 4 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7