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| author |   Thomas Gleixner <tglx@linutronix.de> | 2018-01-27 15:35:29 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-01-27 15:35:29 +0100 |
| commit | 303c146df1c4574db3495d9acc5c440dd46c6b0f (patch) | |
| tree | fbcea289aea24da8a44c7677a776988bb3c8bcbe /Documentation/networking/msg_zerocopy.rst | |
| parent | usb/gadget/NCM: Replace tasklet with softirq hrtimer (diff) | |
| parent | hrtimer: Reset hrtimer cpu base proper on CPU hotplug (diff) | |
| download | linux-dev-303c146df1c4574db3495d9acc5c440dd46c6b0f.tar.xz linux-dev-303c146df1c4574db3495d9acc5c440dd46c6b0f.zip | |
Merge branch 'timers/urgent' into timers/core
Pick up urgent bug fix and resolve the conflict.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'Documentation/networking/msg_zerocopy.rst')
| -rw-r--r-- | Documentation/networking/msg_zerocopy.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/networking/msg_zerocopy.rst b/Documentation/networking/msg_zerocopy.rst index 77f6d7e25cfd..291a01264967 100644 --- a/Documentation/networking/msg_zerocopy.rst +++ b/Documentation/networking/msg_zerocopy.rst @@ -72,6 +72,10 @@ this flag, a process must first signal intent by setting a socket option: if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &one, sizeof(one))) error(1, errno, "setsockopt zerocopy"); +Setting the socket option only works when the socket is in its initial +(TCP_CLOSED) state. Trying to set the option for a socket returned by accept(), +for example, will lead to an EBUSY error. In this case, the option should be set +to the listening socket and it will be inherited by the accepted sockets. Transmission ------------ |