Hi Gaurav, I had tried to use the workqueues but it fails; what happens is that queue_work() fails. (The return value from queue_work() is NOT 1 ). the reason is probably that I MUST call the queue_work() when I am in a function which is in software interrupt context. This is a requirement. So is there a way to get out of it ? Regards, Mark On 2/23/07, GAggarwal@xxxxxxxxxxxxxxxxxx <GAggarwal@xxxxxxxxxxxxxxxxxx> wrote:
Hi Mark, Use Workqueues as a deferred procedure call and not the tasklet or softIRQ. SoftIRQs and tasklets cannot sleep. Thumb rule is if the deferred work needs to sleep, worq queues are used. -- Regards, Gaurav Aggarwal -----Original Message----- From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx]On Behalf Of Mark Ryden Sent: Friday, February 23, 2007 1:58 PM To: kernelnewbies@xxxxxxxxxxxx Subject: Re: create a kernel socket from interrupt context Hi, Thanks, Topi. I tried two things: First , create a work queue and calling it from the interrupt. what happens is that queue_work() fails. (The return value from queue_work() is NOT 1 ). So I looked into it and found that the problem is that I am in fact in software interrupt context, not in hw interrupt context. After looking for solutions and reading about this,I found out that what I should use for software interrupts is a tasklet. So I inserted taskets and the tasklet function is indeed called from the software interrupt context. The problem is that when I try to send a packet from a tasklet I have the same error; "sleeping function called from invalid context". Is there some way out of this ? I mean, to send packets from software interrupt context ? Regards, Mark On 2/22/07, Mark Ryden <markryde@xxxxxxxxx> wrote: > Hello, > > Is it possible somehow to create a TCP socket from kernel and to send > a message when you are in interrupt context ? > I made a test : I created a kernel socket with > sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock) > and then connected it with: > sock->ops->connect(sock, > (struct sockaddr*)&addr, > sizeof(struct sockaddr), 0) > > When working NOT in interrupt context,it works OK; I called : > kernel_sendmsg(sock, &msg, &iov, 1, length); > and a TCP packet WAS sent (I verified it with a sniffer) > > BUT, in interrupt context, I called : > kernel_sendmsg(sock, &msg, &iov, 1, length); > > I got: > Feb 22 12:02:54 markhost kernel: BUG: sleeping function called from > invalid context > Feb 22 12:02:54 markhost: in_atomic():1, irqs_disabled():0 > > Why is it so ? is there another way create a kernel TCP socket > and to send a packet? > > Regards, > Mark > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ The information contained in this electronic mail transmission may be privileged and confidential, and therefore, protected from disclosure. If you have received this communication in error, please notify us immediately by replying to this message and deleting it from your computer without copying or disclosing it.
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