From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
Adds support for extended window size (EWS) config option. We enable EWS
feature in L2CAP Info RSP when hs enabled. EWS option is included in L2CAP
Config Req if tx_win (which is set via socket) bigger then standard default
value (63) && hs enabled && remote side supports EWS feature.
Using EWS selects extended control field in L2CAP.
Code partly based on Qualcomm and Atheros patches sent upstream a year ago.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
include/net/bluetooth/l2cap.h | 8 +++++-
net/bluetooth/l2cap_core.c | 51 ++++++++++++++++++++++++++++++++++++++--
net/bluetooth/l2cap_sock.c | 8 +++---
3 files changed, 58 insertions(+), 9 deletions(-)
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index 08ad40b..51998ff 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -32,6 +32,7 @@
#define L2CAP_DEFAULT_MIN_MTU 48
#define L2CAP_DEFAULT_FLUSH_TO 0xffff
#define L2CAP_DEFAULT_TX_WINDOW 63
+#define L2CAP_DEFAULT_EXT_WINDOW 0x3FFF
#define L2CAP_DEFAULT_MAX_TX 3
#define L2CAP_DEFAULT_RETRANS_TO 2000 /* 2 seconds */
#define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */
@@ -233,6 +234,7 @@ struct l2cap_conf_opt {
#define L2CAP_CONF_QOS 0x03
#define L2CAP_CONF_RFC 0x04
#define L2CAP_CONF_FCS 0x05
+#define L2CAP_CONF_EWS 0x07
#define L2CAP_CONF_MAX_SIZE 22
@@ -333,7 +335,7 @@ struct l2cap_chan {
__u8 fcs;
- __u8 tx_win;
+ __u16 tx_win;
__u8 max_tx;
__u16 retrans_timeout;
__u16 monitor_timeout;
@@ -357,7 +359,7 @@ struct l2cap_chan {
struct sk_buff *sdu;
struct sk_buff *sdu_last_frag;
- __u8 remote_tx_win;
+ __u16 remote_tx_win;
__u8 remote_max_tx;
__u16 remote_mps;
@@ -442,6 +444,7 @@ enum {
CONF_CONNECT_PEND,
CONF_NO_FCS_RECV,
CONF_STATE2_DEVICE,
+ CONF_EWS_RECV,
};
#define L2CAP_CONF_MAX_CONF_REQ 2
@@ -465,6 +468,7 @@ enum {
FLAG_FORCE_ACTIVE,
FLAG_FORCE_RELIABLE,
FLAG_FLUSHABLE,
+ FLAG_EXT_CTRL,
};
#define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 18a08c5..6e34312 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1898,6 +1898,22 @@ static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
}
}
+static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
+{
+ return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
+}
+
+static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
+{
+ if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
+ __l2cap_ews_supported(chan))
+ /* use extended control field */
+ set_bit(FLAG_EXT_CTRL, &chan->flags);
+ else
+ chan->tx_win = min_t(u16, chan->tx_win,
+ L2CAP_DEFAULT_TX_WINDOW);
+}
+
static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
{
struct l2cap_conf_req *req = data;
@@ -1944,7 +1960,6 @@ done:
case L2CAP_MODE_ERTM:
rfc.mode = L2CAP_MODE_ERTM;
- rfc.txwin_size = chan->tx_win;
rfc.max_transmit = chan->max_tx;
rfc.retrans_timeout = 0;
rfc.monitor_timeout = 0;
@@ -1952,6 +1967,11 @@ done:
if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
+ l2cap_txwin_setup(chan);
+
+ rfc.txwin_size = min_t(u16, chan->tx_win,
+ L2CAP_DEFAULT_TX_WINDOW);
+
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
(unsigned long) &rfc);
@@ -1963,6 +1983,10 @@ done:
chan->fcs = L2CAP_FCS_NONE;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
}
+
+ if (test_bit(FLAG_EXT_CTRL, &chan->flags))
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
+ chan->tx_win);
break;
case L2CAP_MODE_STREAMING:
@@ -2038,6 +2062,15 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
break;
+ case L2CAP_CONF_EWS:
+ if (!enable_hs)
+ return -ECONNREFUSED;
+
+ set_bit(FLAG_EXT_CTRL, &chan->flags);
+ set_bit(CONF_EWS_RECV, &chan->conf_state);
+ chan->remote_tx_win = val;
+ break;
+
default:
if (hint)
break;
@@ -2098,7 +2131,11 @@ done:
break;
case L2CAP_MODE_ERTM:
- chan->remote_tx_win = rfc.txwin_size;
+ if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
+ chan->remote_tx_win = rfc.txwin_size;
+ else
+ rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
+
chan->remote_max_tx = rfc.max_transmit;
if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
@@ -2190,6 +2227,13 @@ static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, voi
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
sizeof(rfc), (unsigned long) &rfc);
break;
+
+ case L2CAP_CONF_EWS:
+ chan->tx_win = min_t(u16, val,
+ L2CAP_DEFAULT_EXT_WINDOW);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS,
+ 2, chan->tx_win);
+ break;
}
}
@@ -2785,7 +2829,8 @@ static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cm
feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
| L2CAP_FEAT_FCS;
if (enable_hs)
- feat_mask |= L2CAP_FEAT_EXT_FLOW;
+ feat_mask |= L2CAP_FEAT_EXT_FLOW
+ | L2CAP_FEAT_EXT_WINDOW;
put_unaligned_le32(feat_mask, rsp->data);
l2cap_send_cmd(conn, cmd->ident,
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index aa2f2f0..4b388b7 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -331,7 +331,7 @@ static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __us
opts.mode = chan->mode;
opts.fcs = chan->fcs;
opts.max_tx = chan->max_tx;
- opts.txwin_size = (__u16)chan->tx_win;
+ opts.txwin_size = chan->tx_win;
len = min_t(unsigned int, len, sizeof(opts));
if (copy_to_user(optval, (char *) &opts, len))
@@ -501,7 +501,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __us
opts.mode = chan->mode;
opts.fcs = chan->fcs;
opts.max_tx = chan->max_tx;
- opts.txwin_size = (__u16)chan->tx_win;
+ opts.txwin_size = chan->tx_win;
len = min_t(unsigned int, sizeof(opts), optlen);
if (copy_from_user((char *) &opts, optval, len)) {
@@ -509,7 +509,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __us
break;
}
- if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
+ if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
err = -EINVAL;
break;
}
@@ -533,7 +533,7 @@ static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __us
chan->omtu = opts.omtu;
chan->fcs = opts.fcs;
chan->max_tx = opts.max_tx;
- chan->tx_win = (__u8)opts.txwin_size;
+ chan->tx_win = opts.txwin_size;
break;
case L2CAP_LM:
--
1.7.4.1
--
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