From 36bd28c1cb0dbf48645cfe43159907fb3253b33a Mon Sep 17 00:00:00 2001 From: haozhe chang Date: Thu, 16 Mar 2023 17:58:20 +0800 Subject: wwan: core: Support slicing in port TX flow of WWAN subsystem wwan_port_fops_write inputs the SKB parameter to the TX callback of the WWAN device driver. However, the WWAN device (e.g., t7xx) may have an MTU less than the size of SKB, causing the TX buffer to be sliced and copied once more in the WWAN device driver. This patch implements the slicing in the WWAN subsystem and gives the WWAN devices driver the option to slice(by frag_len) or not. By doing so, the additional memory copy is reduced. Meanwhile, this patch gives WWAN devices driver the option to reserve headroom in fragments for the device-specific metadata. Signed-off-by: haozhe chang Reviewed-by: Loic Poulain Link: https://lore.kernel.org/r/20230316095826.181904-1-haozhe.chang@mediatek.com Signed-off-by: Jakub Kicinski --- drivers/net/wwan/iosm/iosm_ipc_port.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/wwan/iosm/iosm_ipc_port.c') diff --git a/drivers/net/wwan/iosm/iosm_ipc_port.c b/drivers/net/wwan/iosm/iosm_ipc_port.c index b6d81c627277..5d5b4183e14a 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_port.c +++ b/drivers/net/wwan/iosm/iosm_ipc_port.c @@ -63,7 +63,8 @@ struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem, ipc_port->ipc_imem = ipc_imem; ipc_port->iosm_port = wwan_create_port(ipc_port->dev, port_type, - &ipc_wwan_ctrl_ops, ipc_port); + &ipc_wwan_ctrl_ops, NULL, + ipc_port); return ipc_port; } -- cgit v1.2.3