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port-qmi: limit MTU to max RMNET packet size

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The maximum MTU that the master interface can support should be less
or equal than RMNET_MAX_PACKET_SIZE, as defined in the
`rmnet_private.h` file in the linux sources (not a public header).

Only applicable to RMNET link management (i.e. not to qmi_wwan
add_mux/del_mux).

Fixes https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/issues/71
This commit is contained in:
Aleksander Morgado
2021-07-31 23:45:26 +02:00
parent 5adc469701
commit 965c43fec7
1 changed files with 9 additions and 1 deletions
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10
src/mm-port-qmi.c
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@@ -31,6 +31,9 @@
#define DEFAULT_LINK_PREALLOCATED_AMOUNT 4
/* as internally defined in the kernel */
#define RMNET_MAX_PACKET_SIZE 16384
G_DEFINE_TYPE (MMPortQmi, mm_port_qmi, MM_TYPE_PORT)
#if defined WITH_QRTR
@@ -1321,8 +1324,13 @@ setup_master_mtu (GTask *task)
* aggregation size */
if (ctx->kernel_data_modes_requested & (MM_PORT_QMI_KERNEL_DATA_MODE_MUX_RMNET | MM_PORT_QMI_KERNEL_DATA_MODE_MUX_QMIWWAN)) {
/* Load current max datagram size supported */
if (MM_PORT_QMI_DAP_IS_SUPPORTED_QMAP (ctx->wda_dl_dap_requested))
if (MM_PORT_QMI_DAP_IS_SUPPORTED_QMAP (ctx->wda_dl_dap_requested)) {
mtu = ctx->wda_dl_dap_max_size_current;
if ((ctx->kernel_data_modes_requested & MM_PORT_QMI_KERNEL_DATA_MODE_MUX_RMNET) && (mtu > RMNET_MAX_PACKET_SIZE)) {
mm_obj_dbg (self, "mtu limited to maximum rmnet packet size");
mtu = RMNET_MAX_PACKET_SIZE;
}
}
/* If no max aggregation size was specified by the modem (e.g. if we requested QMAP
* aggregation protocol but the modem doesn't support it), skip */