From 4dd820c088d201e526840c9dbc2f0b87a0a41868 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Sjur=20Br=C3=A6ndeland?= Date: Mon, 11 Apr 2011 10:43:51 +0000 Subject: caif: Don't resend if dev_queue_xmit fails. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If CAIF Link Layer returns an error, we no longer try to re-build the CAIF packet and resend it. Instead, we simply return any transmission errors to the socket client. Signed-off-by: Sjur Brændeland Signed-off-by: David S. Miller diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c index b533bb0..a518fdd 100644 --- a/net/caif/caif_dev.c +++ b/net/caif/caif_dev.c @@ -120,25 +120,12 @@ static int transmit(struct cflayer *layer, struct cfpkt *pkt) { struct caif_device_entry *caifd = container_of(layer, struct caif_device_entry, layer); - struct sk_buff *skb, *skb2; - int ret = -EINVAL; + struct sk_buff *skb; + skb = cfpkt_tonative(pkt); skb->dev = caifd->netdev; - /* - * Don't allow SKB to be destroyed upon error, but signal resend - * notification to clients. We can't rely on the return value as - * congestion (NET_XMIT_CN) sometimes drops the packet, sometimes don't. - */ - if (netif_queue_stopped(caifd->netdev)) - return -EAGAIN; - skb2 = skb_get(skb); - - ret = dev_queue_xmit(skb2); - - if (!ret) - kfree_skb(skb); - else - return -EAGAIN; + + dev_queue_xmit(skb); return 0; } diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c index 37a4034..2021242 100644 --- a/net/caif/caif_socket.c +++ b/net/caif/caif_socket.c @@ -519,43 +519,14 @@ static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk, int noblock, long timeo) { struct cfpkt *pkt; - int ret, loopcnt = 0; pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb); memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info)); - do { - - ret = -ETIMEDOUT; - /* Slight paranoia, probably not needed. */ - if (unlikely(loopcnt++ > 1000)) { - pr_warn("transmit retries failed, error = %d\n", ret); - break; - } + if (cf_sk->layer.dn == NULL) + return -EINVAL; - if (cf_sk->layer.dn != NULL) - ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); - if (likely(ret >= 0)) - break; - /* if transmit return -EAGAIN, then retry */ - if (noblock && ret == -EAGAIN) - break; - timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret); - if (signal_pending(current)) { - ret = sock_intr_errno(timeo); - break; - } - if (ret) - break; - if (cf_sk->sk.sk_state != CAIF_CONNECTED || - sock_flag(&cf_sk->sk, SOCK_DEAD) || - (cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) { - ret = -EPIPE; - cf_sk->sk.sk_err = EPIPE; - break; - } - } while (ret == -EAGAIN); - return ret; + return cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt); } /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */ diff --git a/net/caif/cfdgml.c b/net/caif/cfdgml.c index 054fdb5..0382dec 100644 --- a/net/caif/cfdgml.c +++ b/net/caif/cfdgml.c @@ -108,10 +108,5 @@ static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt) */ info->hdr_len = 4; info->dev_info = &service->dev_info; - ret = layr->dn->transmit(layr->dn, pkt); - if (ret < 0) { - u32 tmp32; - cfpkt_extr_head(pkt, &tmp32, 4); - } - return ret; + return layr->dn->transmit(layr->dn, pkt); } diff --git a/net/caif/cffrml.c b/net/caif/cffrml.c index a445043..2423fed 100644 --- a/net/caif/cffrml.c +++ b/net/caif/cffrml.c @@ -120,7 +120,6 @@ static int cffrml_transmit(struct cflayer *layr, struct cfpkt *pkt) int tmp; u16 chks; u16 len; - int ret; struct cffrml *this = container_obj(layr); if (this->dofcs) { chks = cfpkt_iterate(pkt, cffrml_checksum, 0xffff); @@ -137,12 +136,7 @@ static int cffrml_transmit(struct cflayer *layr, struct cfpkt *pkt) pr_err("Packet is erroneous!\n"); return -EPROTO; } - ret = layr->dn->transmit(layr->dn, pkt); - if (ret < 0) { - /* Remove header on faulty packet. */ - cfpkt_extr_head(pkt, &tmp, 2); - } - return ret; + return layr->dn->transmit(layr->dn, pkt); } static void cffrml_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, diff --git a/net/caif/cfmuxl.c b/net/caif/cfmuxl.c index f8ce0f3..ebfda2c 100644 --- a/net/caif/cfmuxl.c +++ b/net/caif/cfmuxl.c @@ -184,7 +184,6 @@ static int cfmuxl_receive(struct cflayer *layr, struct cfpkt *pkt) static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt) { - int ret; struct cfmuxl *muxl = container_obj(layr); u8 linkid; struct cflayer *dn; @@ -198,11 +197,7 @@ static int cfmuxl_transmit(struct cflayer *layr, struct cfpkt *pkt) info->hdr_len += 1; linkid = info->channel_id; cfpkt_add_head(pkt, &linkid, 1); - ret = dn->transmit(dn, pkt); - /* Remove MUX protocol header upon error. */ - if (ret < 0) - cfpkt_extr_head(pkt, &linkid, 1); - return ret; + return dn->transmit(dn, pkt); } static void cfmuxl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, diff --git a/net/caif/cfserl.c b/net/caif/cfserl.c index 8303fe3..2715c84 100644 --- a/net/caif/cfserl.c +++ b/net/caif/cfserl.c @@ -179,15 +179,10 @@ static int cfserl_receive(struct cflayer *l, struct cfpkt *newpkt) static int cfserl_transmit(struct cflayer *layer, struct cfpkt *newpkt) { struct cfserl *layr = container_obj(layer); - int ret; u8 tmp8 = CFSERL_STX; if (layr->usestx) cfpkt_add_head(newpkt, &tmp8, 1); - ret = layer->dn->transmit(layer->dn, newpkt); - if (ret < 0) - cfpkt_extr_head(newpkt, &tmp8, 1); - - return ret; + return layer->dn->transmit(layer->dn, newpkt); } static void cfserl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl, diff --git a/net/caif/cfutill.c b/net/caif/cfutill.c index 315c0d6..98e027d 100644 --- a/net/caif/cfutill.c +++ b/net/caif/cfutill.c @@ -100,10 +100,5 @@ static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt) */ info->hdr_len = 1; info->dev_info = &service->dev_info; - ret = layr->dn->transmit(layr->dn, pkt); - if (ret < 0) { - u32 tmp32; - cfpkt_extr_head(pkt, &tmp32, 4); - } - return ret; + return layr->dn->transmit(layr->dn, pkt); } diff --git a/net/caif/cfveil.c b/net/caif/cfveil.c index c3b1dec..1a588cd 100644 --- a/net/caif/cfveil.c +++ b/net/caif/cfveil.c @@ -96,8 +96,5 @@ static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt) info->channel_id = service->layer.id; info->hdr_len = 1; info->dev_info = &service->dev_info; - ret = layr->dn->transmit(layr->dn, pkt); - if (ret < 0) - cfpkt_extr_head(pkt, &tmp, 1); - return ret; + return layr->dn->transmit(layr->dn, pkt); } diff --git a/net/caif/cfvidl.c b/net/caif/cfvidl.c index bf6fef2..b2f5989 100644 --- a/net/caif/cfvidl.c +++ b/net/caif/cfvidl.c @@ -60,8 +60,5 @@ static int cfvidl_transmit(struct cflayer *layr, struct cfpkt *pkt) info = cfpkt_info(pkt); info->channel_id = service->layer.id; info->dev_info = &service->dev_info; - ret = layr->dn->transmit(layr->dn, pkt); - if (ret < 0) - cfpkt_extr_head(pkt, &videoheader, 4); - return ret; + return layr->dn->transmit(layr->dn, pkt); } -- cgit v0.10.2