diff options
| author | Samuel Ortiz <sameo@linux.intel.com> | 2011-08-19 15:47:11 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-08-24 14:41:44 -0400 |
| commit | e8753043f9fbabffbf087c7f4b514c50ef89541e (patch) | |
| tree | 2c4b382a21500c228005a43e48134d39fdcccbe8 /net | |
| parent | 4e0d8cc1006b889909a87f824943bad9a56358e8 (diff) | |
| download | linux-3.10-e8753043f9fbabffbf087c7f4b514c50ef89541e.tar.gz linux-3.10-e8753043f9fbabffbf087c7f4b514c50ef89541e.tar.bz2 linux-3.10-e8753043f9fbabffbf087c7f4b514c50ef89541e.zip | |
NFC: Reserve tx head and tail room
We can have the NFC core layer allocating the tx head and tail
room for the drivers and avoid 1 or more SKBs copy on write on
the Tx path.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/nfc/core.c | 6 | ||||
| -rw-r--r-- | net/nfc/rawsock.c | 13 |
2 files changed, 11 insertions, 8 deletions
diff --git a/net/nfc/core.c b/net/nfc/core.c index b6fd4e1f205..284e2f6a14f 100644 --- a/net/nfc/core.c +++ b/net/nfc/core.c @@ -322,7 +322,9 @@ struct nfc_dev *nfc_get_device(unsigned idx) * @supported_protocols: NFC protocols supported by the device */ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, - u32 supported_protocols) + u32 supported_protocols, + int tx_headroom, + int tx_tailroom) { static atomic_t dev_no = ATOMIC_INIT(0); struct nfc_dev *dev; @@ -345,6 +347,8 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, dev->ops = ops; dev->supported_protocols = supported_protocols; + dev->tx_headroom = tx_headroom; + dev->tx_tailroom = tx_tailroom; spin_lock_init(&dev->targets_lock); nfc_genl_data_init(&dev->genl_data); diff --git a/net/nfc/rawsock.c b/net/nfc/rawsock.c index 52de84a5511..9fd652a5142 100644 --- a/net/nfc/rawsock.c +++ b/net/nfc/rawsock.c @@ -123,11 +123,7 @@ error: static int rawsock_add_header(struct sk_buff *skb) { - - if (skb_cow_head(skb, 1)) - return -ENOMEM; - - *skb_push(skb, 1) = 0; + *skb_push(skb, NFC_HEADER_SIZE) = 0; return 0; } @@ -197,6 +193,7 @@ static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) { struct sock *sk = sock->sk; + struct nfc_dev *dev = nfc_rawsock(sk)->dev; struct sk_buff *skb; int rc; @@ -208,11 +205,13 @@ static int rawsock_sendmsg(struct kiocb *iocb, struct socket *sock, if (sock->state != SS_CONNECTED) return -ENOTCONN; - skb = sock_alloc_send_skb(sk, len, msg->msg_flags & MSG_DONTWAIT, - &rc); + skb = sock_alloc_send_skb(sk, len + dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE, + msg->msg_flags & MSG_DONTWAIT, &rc); if (!skb) return rc; + skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); + rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); if (rc < 0) { kfree_skb(skb); |