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Filename Latest commit message Latest commit date
Finn Thain 3a21378463 net/sonic: Avoid needless receive descriptor EOL flag updates 
commit eaabfd19b2c787bbe88dc32424b9a43d67293422 upstream.

The while loop in sonic_rx() traverses the rx descriptor ring. It stops
when it reaches a descriptor that the SONIC has not used. Each iteration
advances the EOL flag so the SONIC can keep using more descriptors.
Therefore, the while loop has no definite termination condition.

The algorithm described in the National Semiconductor literature is quite
different. It consumes descriptors up to the one with its EOL flag set
(which will also have its "in use" flag set). All freed descriptors are
then returned to the ring at once, by adjusting the EOL flags (and link
pointers).

Adopt the algorithm from datasheet as it's simpler, terminates quickly
and avoids a lot of pointless descriptor EOL flag changes.

Fixes: efcce83936 ("[PATCH] macsonic/jazzsonic network drivers update")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-29 16:45:32 +01:00
arch powerpc/xive: Discard ESB load value when interrupt is invalid 2020-01-29 16:45:26 +01:00
block
certs
crypto
Documentation
drivers net/sonic: Avoid needless receive descriptor EOL flag updates 2020-01-29 16:45:32 +01:00
fs readdir: be more conservative with directory entry names 2020-01-29 16:45:31 +01:00
include tracing: xen: Ordered comparison of function pointers 2020-01-29 16:45:30 +01:00
init
ipc
kernel tracing: Fix histogram code when expression has same var as value 2020-01-29 16:45:26 +01:00
lib lib: Reduce user_access_begin() boundaries in strncpy_from_user() and strnlen_user() 2020-01-29 16:45:29 +01:00
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mm
net net, sk_msg: Don't check if sock is locked when tearing down psock 2020-01-29 16:45:31 +01:00
samples
scripts ARM: 8950/1: ftrace/recordmcount: filter relocation types 2020-01-29 16:45:27 +01:00
security
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usr
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.