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authorThierry Escande <thierry.escande@collabora.com>2016-07-19 11:58:17 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2016-07-19 23:24:49 +0200
commit2a0fe4fe5bf2a6e2277354e7e8f369a20d881891 (patch)
tree79c35f3dc21422ec56ba41e0da9049843272e527
parentf9ac6273e5b8fa45e7cd2086e1bbc91af9af7f19 (diff)
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 <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--drivers/nfc/nfcsim.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c
index 97067a5..a466e79 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,