Commit 2a0fe4fe authored Jul 19, 2016 by Thierry Escande Committed by Samuel Ortiz Jul 19, 2016

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>

parent f9ac6273

drivers/nfc/nfcsim.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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,

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