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| author |   Alexey Orishko <alexey.orishko@gmail.com> | 2012-03-14 11:26:11 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-03-16 02:08:36 -0700 |
| commit | 3f658cde9401bd45429ee720cf2c69f0bc5547b9 (patch) | |
| tree | 369600921781f515c587853aa7c7b7cacd1d6884 | |
| parent | cdc_ncm: reduce driver latency in the data path (diff) | |
| download | linux-dev-3f658cde9401bd45429ee720cf2c69f0bc5547b9.tar.xz linux-dev-3f658cde9401bd45429ee720cf2c69f0bc5547b9.zip | |
cdc_ncm: fix MTU and max_datagram_size handling
Changes/fixes:
- inform device if max_datagram_size was changed by host
- max_datagram_size can't be bigger MTU in ETH func descr
- fix constants definitions to enable running CAIF service over NCM
Tested on Intel/ARM.
Reviewed-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Tested-by: Dmitry Tarnyagin <Dmitry.Tarnyagin@stericsson.com>
Signed-off-by: Alexey Orishko <alexey.orishko@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/usb/cdc_ncm.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index a8e2a62c2958..f8f194658412 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -58,8 +58,8 @@ #define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10 /* Maximum NTB length */ -#define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */ -#define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */ +#define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */ +#define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */ /* Minimum value for MaxDatagramSize, ch. 6.2.9 */ #define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */ @@ -67,13 +67,13 @@ #define CDC_NCM_MIN_TX_PKT 512 /* bytes */ /* Default value for MaxDatagramSize */ -#define CDC_NCM_MAX_DATAGRAM_SIZE 2048 /* bytes */ +#define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */ /* * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting * the last NULL entry. Any additional datagrams in NTB would be discarded. */ -#define CDC_NCM_DPT_DATAGRAMS_MAX 32 +#define CDC_NCM_DPT_DATAGRAMS_MAX 40 /* Maximum amount of IN datagrams in NTB */ #define CDC_NCM_DPT_DATAGRAMS_IN_MAX 0 /* unlimited */ @@ -366,27 +366,25 @@ size_err: if (err < 0) { pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n", CDC_NCM_MIN_DATAGRAM_SIZE); - kfree(max_datagram_size); } else { ctx->max_datagram_size = le16_to_cpu(*max_datagram_size); /* Check Eth descriptor value */ - if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) { - if (ctx->max_datagram_size > eth_max_sz) + if (ctx->max_datagram_size > eth_max_sz) ctx->max_datagram_size = eth_max_sz; - } else { - if (ctx->max_datagram_size > - CDC_NCM_MAX_DATAGRAM_SIZE) - ctx->max_datagram_size = + + if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE) + ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE; - } if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE) ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE; /* if value changed, update device */ - err = usb_control_msg(ctx->udev, + if (ctx->max_datagram_size != + le16_to_cpu(*max_datagram_size)) { + err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), USB_CDC_SET_MAX_DATAGRAM_SIZE, USB_TYPE_CLASS | USB_DIR_OUT @@ -394,14 +392,14 @@ size_err: 0, iface_no, max_datagram_size, 2, 1000); - kfree(max_datagram_size); -max_dgram_err: - if (err < 0) - pr_debug("SET_MAX_DATAGRAM_SIZE failed\n"); + if (err < 0) + pr_debug("SET_MAX_DGRAM_SIZE failed\n"); + } } - + kfree(max_datagram_size); } +max_dgram_err: if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN)) ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN; |