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Message-Id: <1350939400-27209-4-git-send-email-bjorn@mork.no>
Date: Mon, 22 Oct 2012 22:56:30 +0200
From: Bjørn Mork <bjorn@...k.no>
To: netdev@...r.kernel.org
Cc: linux-usb@...r.kernel.org, Oliver Neukum <oliver@...kum.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexey Orishko <alexey.orishko@...il.com>,
Greg Suarez <gpsuarez2512@...il.com>,
"Fangxiaozhi (Franko)" <fangxiaozhi@...wei.com>,
Dan Williams <dcbw@...hat.com>,
Aleksander Morgado <aleksander@...edo.com>,
Greg Suarez <gsuarez@...thmicro.com>,
Bjørn Mork <bjorn@...k.no>
Subject: [PATCH v2 net-next 03/13] net: cdc_ncm: adding MBIM support to ncm_setup
From: Greg Suarez <gsuarez@...thmicro.com>
MBIM and NCM are very similar, so we can reuse most of the
setup and bind logic in cdc_ncm for CDC MBIM devices. Handle
a few minor differences in ncm_setup.
Signed-off-by: Greg Suarez <gsuarez@...thmicro.com>
Signed-off-by: Bjørn Mork <bjorn@...k.no>
---
drivers/net/usb/cdc_ncm.c | 50 +++++++++++++++++++++++++++++++--------------
1 file changed, 35 insertions(+), 15 deletions(-)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 32bdf54..77c6728 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -64,6 +64,9 @@
/* Minimum value for MaxDatagramSize, ch. 6.2.9 */
#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */
+/* Minimum value for MaxDatagramSize, ch. 8.1.3 */
+#define CDC_MBIM_MIN_DATAGRAM_SIZE 2048 /* bytes */
+
#define CDC_NCM_MIN_TX_PKT 512 /* bytes */
/* Default value for MaxDatagramSize */
@@ -98,6 +101,7 @@ struct cdc_ncm_ctx {
struct tasklet_struct bh;
const struct usb_cdc_ncm_desc *func_desc;
+ const struct usb_cdc_mbim_desc *mbim_desc;
const struct usb_cdc_header_desc *header_desc;
const struct usb_cdc_union_desc *union_desc;
const struct usb_cdc_ether_desc *ether_desc;
@@ -158,7 +162,10 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
u8 flags;
u8 iface_no;
int err;
+ int eth_hlen;
u16 ntb_fmt_supported;
+ u32 min_dgram_size;
+ u32 min_hdr_size;
iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
@@ -184,10 +191,19 @@ static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx)
ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported);
- if (ctx->func_desc != NULL)
+ eth_hlen = ETH_HLEN;
+ min_dgram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
+ min_hdr_size = CDC_NCM_MIN_HDR_SIZE;
+ if (ctx->mbim_desc != NULL) {
+ flags = ctx->mbim_desc->bmNetworkCapabilities;
+ eth_hlen = 0;
+ min_dgram_size = CDC_MBIM_MIN_DATAGRAM_SIZE;
+ min_hdr_size = 0;
+ } else if (ctx->func_desc != NULL) {
flags = ctx->func_desc->bmNetworkCapabilities;
- else
+ } else {
flags = 0;
+ }
pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u "
"wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u "
@@ -237,7 +253,7 @@ size_err:
/* verify maximum size of transmitted NTB in bytes */
if ((ctx->tx_max <
- (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) ||
+ (min_hdr_size + min_dgram_size)) ||
(ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
pr_debug("Using default maximum transmit length=%d\n",
CDC_NCM_NTB_MAX_SIZE_TX);
@@ -279,8 +295,8 @@ size_err:
}
/* adjust TX-remainder according to NCM specification. */
- ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) &
- (ctx->tx_modulus - 1));
+ ctx->tx_remainder = ((ctx->tx_remainder - eth_hlen) &
+ (ctx->tx_modulus - 1));
/* additional configuration */
@@ -307,12 +323,18 @@ size_err:
pr_debug("Setting NTB format to 16-bit failed\n");
}
- ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE;
+ ctx->max_datagram_size = min_dgram_size;
/* set Max Datagram Size (MTU) */
if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) {
__le16 *max_datagram_size;
- u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
+ u16 eth_max_sz;
+ if (ctx->ether_desc != NULL)
+ eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
+ else if (ctx->mbim_desc != NULL)
+ eth_max_sz = le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
+ else
+ goto max_dgram_err;
max_datagram_size = kzalloc(sizeof(*max_datagram_size),
GFP_KERNEL);
@@ -329,7 +351,7 @@ size_err:
2, 1000);
if (err < 0) {
pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n",
- CDC_NCM_MIN_DATAGRAM_SIZE);
+ min_dgram_size);
} else {
ctx->max_datagram_size =
le16_to_cpu(*max_datagram_size);
@@ -338,12 +360,10 @@ size_err:
ctx->max_datagram_size = eth_max_sz;
if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE)
- 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 (ctx->max_datagram_size < min_dgram_size)
+ ctx->max_datagram_size = min_dgram_size;
/* if value changed, update device */
if (ctx->max_datagram_size !=
@@ -364,8 +384,8 @@ size_err:
}
max_dgram_err:
- if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN))
- ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN;
+ if (ctx->netdev->mtu != (ctx->max_datagram_size - eth_hlen))
+ ctx->netdev->mtu = ctx->max_datagram_size - eth_hlen;
return 0;
}
--
1.7.10.4
--
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