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author | Tilman Schmidt <tilman@imap.cc> | 2009-10-06 12:19:07 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-10-06 22:43:50 -0700 |
commit | 088ec0cc96e2befd5f3c035123f95c17bdf26e64 (patch) | |
tree | 4d0fdcc26e6bfd9ee320cf716f56a695e38be8ae /drivers/isdn/gigaset/asyncdata.c | |
parent | 7ecc59c1b7fd5749667fc31f8683099cbef38977 (diff) | |
download | linux-088ec0cc96e2befd5f3c035123f95c17bdf26e64.tar.gz linux-088ec0cc96e2befd5f3c035123f95c17bdf26e64.tar.bz2 linux-088ec0cc96e2befd5f3c035123f95c17bdf26e64.zip |
gigaset: prepare for CAPI implementation
Reorganize the code of the Gigaset driver, moving all isdn4linux
dependencies to the source file i4l.c so that it can be replaced
by a file capi.c interfacing to Kernel CAPI instead.
Impact: refactoring, no functional change
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/isdn/gigaset/asyncdata.c')
-rw-r--r-- | drivers/isdn/gigaset/asyncdata.c | 124 |
1 files changed, 58 insertions, 66 deletions
diff --git a/drivers/isdn/gigaset/asyncdata.c b/drivers/isdn/gigaset/asyncdata.c index 44a58e6f8f65..a25216bf475e 100644 --- a/drivers/isdn/gigaset/asyncdata.c +++ b/drivers/isdn/gigaset/asyncdata.c @@ -119,10 +119,7 @@ static inline int hdlc_loop(unsigned char c, unsigned char *src, int numbytes, int inputstate = bcs->inputstate; __u16 fcs = bcs->fcs; struct sk_buff *skb = bcs->skb; - unsigned char error; - struct sk_buff *compskb; int startbytes = numbytes; - int l; if (unlikely(inputstate & INS_byte_stuff)) { inputstate &= ~INS_byte_stuff; @@ -158,8 +155,8 @@ byte_stuff: #endif /* end of frame */ - error = 1; - gigaset_rcv_error(NULL, cs, bcs); + gigaset_isdn_rcv_err(bcs); + dev_kfree_skb(skb); } else if (!(inputstate & INS_have_data)) { /* 7E 7E */ #ifdef CONFIG_GIGASET_DEBUG ++bcs->emptycount; @@ -170,54 +167,39 @@ byte_stuff: "7e----------------------------"); /* end of frame */ - error = 0; - if (unlikely(fcs != PPP_GOODFCS)) { dev_err(cs->dev, "Checksum failed, %u bytes corrupted!\n", skb->len); - compskb = NULL; - gigaset_rcv_error(compskb, cs, bcs); - error = 1; + gigaset_isdn_rcv_err(bcs); + dev_kfree_skb(skb); + } else if (likely(skb->len > 2)) { + __skb_trim(skb, skb->len - 2); + gigaset_skb_rcvd(bcs, skb); } else { - if (likely((l = skb->len) > 2)) { - skb->tail -= 2; - skb->len -= 2; - } else { - dev_kfree_skb(skb); - skb = NULL; - inputstate |= INS_skip_frame; - if (l == 1) { - dev_err(cs->dev, - "invalid packet size (1)!\n"); - error = 1; - gigaset_rcv_error(NULL, - cs, bcs); - } - } - if (likely(!(error || - (inputstate & - INS_skip_frame)))) { - gigaset_rcv_skb(skb, cs, bcs); + if (skb->len) { + dev_err(cs->dev, + "invalid packet size (%d)\n", skb->len); + gigaset_isdn_rcv_err(bcs); } + dev_kfree_skb(skb); } } - if (unlikely(error)) - if (skb) - dev_kfree_skb(skb); - fcs = PPP_INITFCS; inputstate &= ~(INS_have_data | INS_skip_frame); if (unlikely(bcs->ignore)) { inputstate |= INS_skip_frame; skb = NULL; - } else if (likely((skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)) { - skb_reserve(skb, HW_HDR_LEN); } else { - dev_warn(cs->dev, - "could not allocate new skb\n"); - inputstate |= INS_skip_frame; + skb = dev_alloc_skb(SBUFSIZE + cs->hw_hdr_len); + if (skb != NULL) { + skb_reserve(skb, cs->hw_hdr_len); + } else { + dev_warn(cs->dev, + "could not allocate new skb\n"); + inputstate |= INS_skip_frame; + } } break; @@ -314,18 +296,21 @@ static inline int iraw_loop(unsigned char c, unsigned char *src, int numbytes, /* pass data up */ if (likely(inputstate & INS_have_data)) { if (likely(!(inputstate & INS_skip_frame))) { - gigaset_rcv_skb(skb, cs, bcs); + gigaset_skb_rcvd(bcs, skb); } inputstate &= ~(INS_have_data | INS_skip_frame); if (unlikely(bcs->ignore)) { inputstate |= INS_skip_frame; skb = NULL; - } else if (likely((skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) - != NULL)) { - skb_reserve(skb, HW_HDR_LEN); } else { - dev_warn(cs->dev, "could not allocate new skb\n"); - inputstate |= INS_skip_frame; + skb = dev_alloc_skb(SBUFSIZE + cs->hw_hdr_len); + if (skb != NULL) { + skb_reserve(skb, cs->hw_hdr_len); + } else { + dev_warn(cs->dev, + "could not allocate new skb\n"); + inputstate |= INS_skip_frame; + } } } @@ -383,7 +368,7 @@ void gigaset_m10x_input(struct inbuf_t *inbuf) /* FIXME use function pointers? */ if (inbuf->inputstate & INS_command) procbytes = cmd_loop(c, src, numbytes, inbuf); - else if (inbuf->bcs->proto2 == ISDN_PROTO_L2_HDLC) + else if (inbuf->bcs->proto2 == L2_HDLC) procbytes = hdlc_loop(c, src, numbytes, inbuf); else procbytes = iraw_loop(c, src, numbytes, inbuf); @@ -440,16 +425,16 @@ EXPORT_SYMBOL_GPL(gigaset_m10x_input); /* == data output ========================================================== */ -/* Encoding of a PPP packet into an octet stuffed HDLC frame - * with FCS, opening and closing flags. +/* + * Encode a data packet into an octet stuffed HDLC frame with FCS, + * opening and closing flags, preserving headroom data. * parameters: - * skb skb containing original packet (freed upon return) - * head number of headroom bytes to allocate in result skb - * tail number of tailroom bytes to allocate in result skb + * skb skb containing original packet (freed upon return) + * headroom number of headroom bytes to preserve * Return value: * pointer to newly allocated skb containing the result frame */ -static struct sk_buff *HDLC_Encode(struct sk_buff *skb, int head, int tail) +static struct sk_buff *HDLC_Encode(struct sk_buff *skb, int headroom) { struct sk_buff *hdlc_skb; __u16 fcs; @@ -471,16 +456,17 @@ static struct sk_buff *HDLC_Encode(struct sk_buff *skb, int head, int tail) /* size of new buffer: original size + number of stuffing bytes * + 2 bytes FCS + 2 stuffing bytes for FCS (if needed) + 2 flag bytes + * + room for acknowledgement header */ - hdlc_skb = dev_alloc_skb(skb->len + stuf_cnt + 6 + tail + head); + hdlc_skb = dev_alloc_skb(skb->len + stuf_cnt + 6 + headroom); if (!hdlc_skb) { dev_kfree_skb(skb); return NULL; } - skb_reserve(hdlc_skb, head); - /* Copy acknowledge request into new skb */ - memcpy(hdlc_skb->head, skb->head, 2); + /* Copy acknowledgement header into new skb */ + skb_reserve(hdlc_skb, headroom); + memcpy(hdlc_skb->head, skb->head, headroom); /* Add flag sequence in front of everything.. */ *(skb_put(hdlc_skb, 1)) = PPP_FLAG; @@ -515,15 +501,16 @@ static struct sk_buff *HDLC_Encode(struct sk_buff *skb, int head, int tail) return hdlc_skb; } -/* Encoding of a raw packet into an octet stuffed bit inverted frame +/* + * Encode a data packet into an octet stuffed raw bit inverted frame, + * preserving headroom data. * parameters: - * skb skb containing original packet (freed upon return) - * head number of headroom bytes to allocate in result skb - * tail number of tailroom bytes to allocate in result skb + * skb skb containing original packet (freed upon return) + * headroom number of headroom bytes to preserve * Return value: * pointer to newly allocated skb containing the result frame */ -static struct sk_buff *iraw_encode(struct sk_buff *skb, int head, int tail) +static struct sk_buff *iraw_encode(struct sk_buff *skb, int headroom) { struct sk_buff *iraw_skb; unsigned char c; @@ -531,12 +518,15 @@ static struct sk_buff *iraw_encode(struct sk_buff *skb, int head, int tail) int len; /* worst case: every byte must be stuffed */ - iraw_skb = dev_alloc_skb(2*skb->len + tail + head); + iraw_skb = dev_alloc_skb(2*skb->len + headroom); if (!iraw_skb) { dev_kfree_skb(skb); return NULL; } - skb_reserve(iraw_skb, head); + + /* Copy acknowledgement header into new skb */ + skb_reserve(iraw_skb, headroom); + memcpy(iraw_skb->head, skb->head, headroom); cp = skb->data; len = skb->len; @@ -555,8 +545,10 @@ static struct sk_buff *iraw_encode(struct sk_buff *skb, int head, int tail) * @bcs: B channel descriptor structure. * @skb: data to send. * - * Called by i4l.c to encode and queue an skb for sending, and start + * Called by LL to encode and queue an skb for sending, and start * transmission if necessary. + * Once the payload data has been transmitted completely, gigaset_skb_sent() + * will be called with the first cs->hw_hdr_len bytes of skb->head preserved. * * Return value: * number of bytes accepted for sending (skb->len) if ok, @@ -567,10 +559,10 @@ int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb) unsigned len = skb->len; unsigned long flags; - if (bcs->proto2 == ISDN_PROTO_L2_HDLC) - skb = HDLC_Encode(skb, HW_HDR_LEN, 0); + if (bcs->proto2 == L2_HDLC) + skb = HDLC_Encode(skb, bcs->cs->hw_hdr_len); else - skb = iraw_encode(skb, HW_HDR_LEN, 0); + skb = iraw_encode(skb, bcs->cs->hw_hdr_len); if (!skb) { dev_err(bcs->cs->dev, "unable to allocate memory for encoding!\n"); |