@@ -61,7 +61,18 @@
#define IPHETH_USBINTF_PROTO 1
#define IPHETH_IP_ALIGN 2 /* padding at front of URB */
-#define IPHETH_NCM_HEADER_SIZE (12 + 96) /* NCMH + NCM0 */
+/* On iOS devices, NCM headers in RX have a fixed size regardless of DPE count:
+ * - NTH16 (NCMH): 12 bytes, as per CDC NCM 1.0 spec
+ * - NDP16 (NCM0): 96 bytes, of which
+ * - NDP16 fixed header: 8 bytes
+ * - maximum of 22 DPEs (21 datagrams + trailer), 4 bytes each
+ */
+#define IPHETH_NDP16_MAX_DPE 22
+#define IPHETH_NDP16_HEADER_SIZE (sizeof(struct usb_cdc_ncm_ndp16) + \
+ IPHETH_NDP16_MAX_DPE * \
+ sizeof(struct usb_cdc_ncm_dpe16))
+#define IPHETH_NCM_HEADER_SIZE (sizeof(struct usb_cdc_ncm_nth16) + \
+ IPHETH_NDP16_HEADER_SIZE)
#define IPHETH_TX_BUF_SIZE ETH_FRAME_LEN
#define IPHETH_RX_BUF_SIZE_LEGACY (IPHETH_IP_ALIGN + ETH_FRAME_LEN)
#define IPHETH_RX_BUF_SIZE_NCM 65536
Originally, the total NCM header size was computed as the sum of two vaguely labelled constants. While accurate, it wasn't particularly clear where they were coming from. Use sizes of existing NCM structs where available. Define the total NDP16 size based on the maximum amount of DPEs that can fit into the iOS-specific fixed-size header. This change does not fix any particular issue. Rather, it introduces intermediate constants that will simplify subsequent commits. It should also make it clearer for the reader where the constant values come from. Signed-off-by: Foster Snowhill <forst@pen.gy> --- v4: No code changes. Remove "Fixes" from the commit message, and clarify the purpose/scope of the commit. v3: https://lore.kernel.org/netdev/20241123235432.821220-1-forst@pen.gy/ * NDP16 header size is computed from max DPE count constant, not the other way around. * Split out from a monolithic patch in v2. v2: https://lore.kernel.org/netdev/20240912211817.1707844-1-forst@pen.gy/ No code changes. Update commit message to further clarify that `ipheth` is not and does not aim to be a complete or spec-compliant CDC NCM implementation. v1: https://lore.kernel.org/netdev/20240907230108.978355-1-forst@pen.gy/ --- drivers/net/usb/ipheth.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)