Re: [PATCH bpf-next v2 03/28] HID: hook up with bpf
flat view
From: Song Liu <song@kernel.org>
Date: 2022-03-05 00:23:42
Also in:
bpf, linux-input, linux-kselftest, lkml
On Fri, Mar 4, 2022 at 9:31 AM Benjamin Tissoires [off-list ref] wrote:
Now that BPF can be compatible with HID, add the capability into HID. drivers/hid/hid-bpf.c takes care of the glue between bpf and HID, and hid-core can then inject any incoming event from the device into a BPF program to filter/analyze it. Signed-off-by: Benjamin Tissoires <redacted>
[...]
quoted hunk ↗ jump to hunk
+ +static int hid_bpf_link_attach(struct hid_device *hdev, enum bpf_hid_attach_type type) +{ + int err = 0; + + switch (type) { + case BPF_HID_ATTACH_DEVICE_EVENT: + if (!hdev->bpf.ctx) { + hdev->bpf.ctx = bpf_hid_allocate_ctx(hdev, HID_BPF_MAX_BUFFER_SIZE); + if (IS_ERR(hdev->bpf.ctx)) { + err = PTR_ERR(hdev->bpf.ctx); + hdev->bpf.ctx = NULL; + } + } + break; + default: + /* do nothing */
Do we need to show warning and/or return EINVAL here?
quoted hunk ↗ jump to hunk
+ } + + return err; +} + +static void hid_bpf_array_detached(struct hid_device *hdev, enum bpf_hid_attach_type type) +{ + switch (type) { + case BPF_HID_ATTACH_DEVICE_EVENT: + kfree(hdev->bpf.ctx); + hdev->bpf.ctx = NULL; + break; + default: + /* do nothing */
ditto [...]