From 4b9bc86d5a999e344098303882d6395d39e36c13 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Tue, 12 Apr 2016 17:16:54 +0200 Subject: fcoe: convert to kworker The driver creates its own per-CPU threads which are updated based on CPU hotplug events. It is also possible to use kworkers and remove some of the kthread infrastrucure. The code checked ->thread to decide if there is an active per-CPU thread. By using the kworker infrastructure this is no longer possible (or required). The thread pointer is saved in `kthread' instead of `thread' so anything trying to use thread is caught by the compiler. Currently only the bnx2fc driver is using struct fcoe_percpu_s and the kthread member. After a CPU went offline, we may still enqueue items on the "offline" CPU. This isn't much of a problem. The work will be done on a random CPU. The allocated crc_eof_page page won't be cleaned up. It is probably expected that the CPU comes up at some point so it should not be a problem. The crc_eof_page memory is released of course once the module is removed. This patch was only compile-tested due to -ENODEV. Cc: Vasu Dev Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: Christoph Hellwig Cc: fcoe-devel@open-fcoe.org Cc: linux-scsi@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior Tested-by: Johannes Thumshirn Reviewed-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen --- include/scsi/libfcoe.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/scsi/libfcoe.h b/include/scsi/libfcoe.h index de7e3ee60f0c..c6fbbb6581d3 100644 --- a/include/scsi/libfcoe.h +++ b/include/scsi/libfcoe.h @@ -319,14 +319,16 @@ struct fcoe_transport { /** * struct fcoe_percpu_s - The context for FCoE receive thread(s) - * @thread: The thread context + * @kthread: The thread context (used by bnx2fc) + * @work: The work item (used by fcoe) * @fcoe_rx_list: The queue of pending packets to process * @page: The memory page for calculating frame trailer CRCs * @crc_eof_offset: The offset into the CRC page pointing to available * memory for a new trailer */ struct fcoe_percpu_s { - struct task_struct *thread; + struct task_struct *kthread; + struct work_struct work; struct sk_buff_head fcoe_rx_list; struct page *crc_eof_page; int crc_eof_offset; -- cgit v1.2.3