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author | Gary S. Robertson <gary.robertson@linaro.org> | 2014-01-22 11:06:54 -0600 |
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committer | Gary S. Robertson <gary.robertson@linaro.org> | 2014-01-22 11:06:54 -0600 |
commit | a7fd051cd1119af788dd161a4c834b06377d76a8 (patch) | |
tree | 80368fccae171d1b0446f3e2b4fd4d9b43e65cbe /Documentation/networking/packet_mmap.txt | |
parent | 00629ac158e1be3124b796078cf0347b946cb053 (diff) | |
parent | 1071ea6e68ead40df739b223e9013d99c23c19ab (diff) |
Merge tag 'v3.10.27' of git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable into linux-lnglinux-lng-3.10.27-2014.02
This is the 3.10.27 stable release
Diffstat (limited to 'Documentation/networking/packet_mmap.txt')
-rw-r--r-- | Documentation/networking/packet_mmap.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt index 23dd80e82b8e..0f4376ec8852 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. |