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authorGiuseppe CAVALLARO <peppe.cavallaro@st.com>2011-10-18 04:01:20 +0400
committerDavid S. Miller <davem@davemloft.net>2011-10-20 03:24:16 +0400
commit51e3137b9b6113c7e12cf0a0dc82238854a86712 (patch)
tree29aacb2bdfb421daefc22dd9a7274c2803feb688 /Documentation/networking/stmmac.txt
parenta9097a9666fd7b08fd2a152b2a0b6c8d48639bb2 (diff)
downloadlinux-51e3137b9b6113c7e12cf0a0dc82238854a86712.tar.xz
stmmac: update the driver version and doc (V4)
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking/stmmac.txt')
-rw-r--r--Documentation/networking/stmmac.txt11
1 files changed, 10 insertions, 1 deletions
diff --git a/Documentation/networking/stmmac.txt b/Documentation/networking/stmmac.txt
index 40ec92ce4c84..8d67980fabe8 100644
--- a/Documentation/networking/stmmac.txt
+++ b/Documentation/networking/stmmac.txt
@@ -76,7 +76,16 @@ core.
4.5) DMA descriptors
Driver handles both normal and enhanced descriptors. The latter has been only
-tested on DWC Ether MAC 10/100/1000 Universal version 3.41a.
+tested on DWC Ether MAC 10/100/1000 Universal version 3.41a and later.
+
+STMMAC supports DMA descriptor to operate both in dual buffer (RING)
+and linked-list(CHAINED) mode. In RING each descriptor points to two
+data buffer pointers whereas in CHAINED mode they point to only one data
+buffer pointer. RING mode is the default.
+
+In CHAINED mode each descriptor will have pointer to next descriptor in
+the list, hence creating the explicit chaining in the descriptor itself,
+whereas such explicit chaining is not possible in RING mode.
4.6) Ethtool support
Ethtool is supported. Driver statistics and internal errors can be taken using: