From 2a0fe4fe5bf2a6e2277354e7e8f369a20d881891 Mon Sep 17 00:00:00 2001 From: Thierry Escande Date: Tue, 19 Jul 2016 11:58:17 +0200 Subject: NFC: nfcsim: Simulate lost frames through debugfs entry This patch allows to simulate the lost of frames exchanged between the 2 nfcsim devices through a control entry in the debugfs and is used as follow: echo n > /sys/kernel/debug/nfcsim/nfcX/dropframe Where n specifies the number of frames to be dropped between 0 and 255 and nfcX is either nfc0 or nfc1, one of the two nfcsim devices. In the following example, the next frame that should be sent by the nfc0 device will be dropped and thus not received by the nfc1 device: echo 1 > /sys/kernel/debug/nfcsim/nfc0/dropframe The value of 0 can be used to reset the dropframe counter. Signed-off-by: Thierry Escande Signed-off-by: Samuel Ortiz --- drivers/nfc/nfcsim.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/nfc/nfcsim.c') diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c index 97067a5f248c..a466e7978466 100644 --- a/drivers/nfc/nfcsim.c +++ b/drivers/nfc/nfcsim.c @@ -54,6 +54,8 @@ struct nfcsim { nfc_digital_cmd_complete_t cb; void *arg; + + u8 dropframe; }; struct nfcsim_link { @@ -223,6 +225,14 @@ static int nfcsim_send(struct nfc_digital_dev *ddev, struct sk_buff *skb, schedule_work(&dev->recv_work); + if (dev->dropframe) { + NFCSIM_DBG(dev, "dropping frame (out of %d)\n", dev->dropframe); + dev_kfree_skb(skb); + dev->dropframe--; + + return 0; + } + if (skb) { nfcsim_link_set_skb(dev->link_out, skb, dev->rf_tech, dev->mode); @@ -372,6 +382,8 @@ static void nfcsim_debugfs_init_dev(struct nfcsim *dev) idx); return; } + + debugfs_create_u8("dropframe", 0664, dev_dir, &dev->dropframe); } static struct nfcsim *nfcsim_device_new(struct nfcsim_link *link_in, -- cgit v1.2.3