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authorScott Wood <scottwood@freescale.com>2014-04-08 20:27:17 (GMT)
committerScott Wood <scottwood@freescale.com>2014-04-08 20:27:25 (GMT)
commit63f2cd32fb5f8541636f47cc4c7c53cf8284851f (patch)
treed8e66fde55f70332fd495907d529996e9568038b /Documentation/networking
parent47d2261a3fa71cde24263559a4219a25e50d8c89 (diff)
parent2acf1c25b979aaae983bfd7c0c4dd04b31ccfc01 (diff)
downloadlinux-fsl-qoriq-63f2cd32fb5f8541636f47cc4c7c53cf8284851f.tar.xz
Merge remote-tracking branch 'stable/linux-3.12.y' into sdk-v1.6.x
Signed-off-by: Scott Wood <scottwood@freescale.com> Conflicts: drivers/mmc/card/block.c
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/ip-sysctl.txt3
-rw-r--r--Documentation/networking/packet_mmap.txt10
2 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index a46d785..7d8dc93 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -588,9 +588,6 @@ tcp_limit_output_bytes - INTEGER
typical pfifo_fast qdiscs.
tcp_limit_output_bytes limits the number of bytes on qdisc
or device to reduce artificial RTT/cwnd and reduce bufferbloat.
- Note: For GSO/TSO enabled flows, we try to have at least two
- packets in flight. Reducing tcp_limit_output_bytes might also
- reduce the size of individual GSO packet (64KB being the max)
Default: 131072
tcp_challenge_ack_limit - INTEGER
diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt
index c012236..8e48e3b 100644
--- a/Documentation/networking/packet_mmap.txt
+++ b/Documentation/networking/packet_mmap.txt
@@ -123,6 +123,16 @@ Transmission process is similar to capture as shown below.
[shutdown] close() --------> destruction of the transmission socket and
deallocation of all associated resources.
+Socket creation and destruction is also straight forward, and is done
+the same way as in capturing described in the previous paragraph:
+
+ int fd = socket(PF_PACKET, mode, 0);
+
+The protocol can optionally be 0 in case we only want to transmit
+via this socket, which avoids an expensive call to packet_rcv().
+In this case, you also need to bind(2) the TX_RING with sll_protocol = 0
+set. Otherwise, htons(ETH_P_ALL) or any other protocol, for example.
+
Binding the socket to your network interface is mandatory (with zero copy) to
know the header size of frames used in the circular buffer.