From patchwork Sun Aug 1 21:20:09 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Eckelmann X-Patchwork-Id: 300 Return-Path: Received: from mail.gmx.net (mailout-de.gmx.net [213.165.64.22]) by open-mesh.net (Postfix) with SMTP id DA3D41543DF for ; Sun, 1 Aug 2010 23:20:30 +0200 (CEST) Received: (qmail invoked by alias); 01 Aug 2010 21:20:29 -0000 Received: from i59F6B41E.versanet.de (EHLO sven-desktop.lazhur.ath.cx) [89.246.180.30] by mail.gmx.net (mp008) with SMTP; 01 Aug 2010 23:20:29 +0200 X-Authenticated: #15668376 X-Provags-ID: V01U2FsdGVkX18pE/VcYHEpE1aIt+CZovLqxrv3G1Jfi6tY7KeHEJ mR6x3+hgTVlbCV From: Sven Eckelmann To: b.a.t.m.a.n@lists.open-mesh.org Date: Sun, 1 Aug 2010 23:20:09 +0200 Message-Id: <1280697613-32001-4-git-send-email-sven.eckelmann@gmx.de> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1280697613-32001-1-git-send-email-sven.eckelmann@gmx.de> References: <1280697613-32001-1-git-send-email-sven.eckelmann@gmx.de> X-Y-GMX-Trusted: 0 Subject: [B.A.T.M.A.N.] [PATCH 3/7] batman-adv: Aggregate batman packets directly in skb X-BeenThere: b.a.t.m.a.n@lists.open-mesh.org X-Mailman-Version: 2.1.11 Precedence: list Reply-To: The list for a Better Approach To Mobile Ad-hoc Networking List-Id: The list for a Better Approach To Mobile Ad-hoc Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Aug 2010 21:20:31 -0000 All originator messages are send through aggregation buffers. Those buffers can directly be allocated as skb to reduce the cost of allocation an extra buffer and copying them to a new allocated skb directly before it gets send. Now only the skb must be cloned in case of send_packet_to_if as it gets called by send_packet for each interface. Non-primary ogms must not cloned at all because they will only send once and the forward_packet structure is freed by send_outstanding_bat_packet afterwards. Reported-by: David S. Miller Signed-off-by: Sven Eckelmann --- batman-adv/aggregation.c | 22 ++++++++++++---------- batman-adv/send.c | 24 ++++++++++++------------ batman-adv/types.h | 1 - 3 files changed, 24 insertions(+), 23 deletions(-) diff --git a/batman-adv/aggregation.c b/batman-adv/aggregation.c index d738b7a..5896cf2 100644 --- a/batman-adv/aggregation.c +++ b/batman-adv/aggregation.c @@ -39,7 +39,7 @@ static bool can_aggregate_with(struct batman_packet *new_batman_packet, struct forw_packet *forw_packet) { struct batman_packet *batman_packet = - (struct batman_packet *)forw_packet->packet_buff; + (struct batman_packet *)forw_packet->skb->data; int aggregated_bytes = forw_packet->packet_len + packet_len; /** @@ -106,6 +106,7 @@ static void new_aggregated_packet(unsigned char *packet_buff, { struct forw_packet *forw_packet_aggr; unsigned long flags; + unsigned char *skb_buff; /* FIXME: each batman_if will be attached to a softif */ struct bat_priv *bat_priv = netdev_priv(soft_device); @@ -125,23 +126,22 @@ static void new_aggregated_packet(unsigned char *packet_buff, return; } - forw_packet_aggr->packet_buff = kmalloc(MAX_AGGREGATION_BYTES, - GFP_ATOMIC); - if (!forw_packet_aggr->packet_buff) { + forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES + + sizeof(struct ethhdr)); + if (!forw_packet_aggr->skb) { if (!own_packet) atomic_inc(&bat_priv->batman_queue_left); kfree(forw_packet_aggr); return; } + skb_reserve(forw_packet_aggr->skb, sizeof(struct ethhdr)); INIT_HLIST_NODE(&forw_packet_aggr->list); + skb_buff = skb_put(forw_packet_aggr->skb, packet_len); forw_packet_aggr->packet_len = packet_len; - memcpy(forw_packet_aggr->packet_buff, - packet_buff, - forw_packet_aggr->packet_len); + memcpy(skb_buff, packet_buff, packet_len); - forw_packet_aggr->skb = NULL; forw_packet_aggr->own = own_packet; forw_packet_aggr->if_incoming = if_incoming; forw_packet_aggr->num_packets = 0; @@ -171,8 +171,10 @@ static void aggregate(struct forw_packet *forw_packet_aggr, int packet_len, bool direct_link) { - memcpy((forw_packet_aggr->packet_buff + forw_packet_aggr->packet_len), - packet_buff, packet_len); + unsigned char *skb_buff; + + skb_buff = skb_put(forw_packet_aggr->skb, packet_len); + memcpy(skb_buff, packet_buff, packet_len); forw_packet_aggr->packet_len += packet_len; forw_packet_aggr->num_packets++; diff --git a/batman-adv/send.c b/batman-adv/send.c index 524c0a9..32d989b 100644 --- a/batman-adv/send.c +++ b/batman-adv/send.c @@ -132,14 +132,14 @@ static void send_packet_to_if(struct forw_packet *forw_packet, uint8_t packet_num; int16_t buff_pos; struct batman_packet *batman_packet; + struct sk_buff *skb; if (batman_if->if_status != IF_ACTIVE) return; packet_num = 0; buff_pos = 0; - batman_packet = (struct batman_packet *) - (forw_packet->packet_buff); + batman_packet = (struct batman_packet *)forw_packet->skb->data; /* adjust all flags and log packets */ while (aggregated_packet(buff_pos, @@ -171,12 +171,13 @@ static void send_packet_to_if(struct forw_packet *forw_packet, (batman_packet->num_hna * ETH_ALEN); packet_num++; batman_packet = (struct batman_packet *) - (forw_packet->packet_buff + buff_pos); + (forw_packet->skb->data + buff_pos); } - send_raw_packet(forw_packet->packet_buff, - forw_packet->packet_len, - batman_if, broadcast_addr); + /* create clone because function is called more than once */ + skb = skb_clone(forw_packet->skb, GFP_ATOMIC); + if (skb) + send_skb_packet(skb, batman_if, broadcast_addr); } /* send a batman packet */ @@ -186,7 +187,7 @@ static void send_packet(struct forw_packet *forw_packet) struct bat_priv *bat_priv = netdev_priv(soft_device); struct batman_if *batman_if; struct batman_packet *batman_packet = - (struct batman_packet *)(forw_packet->packet_buff); + (struct batman_packet *)(forw_packet->skb->data); unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0); if (!forw_packet->if_incoming) { @@ -212,10 +213,11 @@ static void send_packet(struct forw_packet *forw_packet) batman_packet->ttl, forw_packet->if_incoming->dev, forw_packet->if_incoming->addr_str); - send_raw_packet(forw_packet->packet_buff, - forw_packet->packet_len, - forw_packet->if_incoming, + /* skb is only used once and than forw_packet is free'd */ + send_skb_packet(forw_packet->skb, forw_packet->if_incoming, broadcast_addr); + forw_packet->skb = NULL; + return; } @@ -379,7 +381,6 @@ static void forw_packet_free(struct forw_packet *forw_packet) { if (forw_packet->skb) kfree_skb(forw_packet->skb); - kfree(forw_packet->packet_buff); kfree(forw_packet); } @@ -438,7 +439,6 @@ int add_bcast_packet_to_list(struct sk_buff *skb) skb_reset_mac_header(skb); forw_packet->skb = skb; - forw_packet->packet_buff = NULL; /* how often did we send the bcast packet ? */ forw_packet->num_packets = 0; diff --git a/batman-adv/types.h b/batman-adv/types.h index 65c2aa4..73304ee 100644 --- a/batman-adv/types.h +++ b/batman-adv/types.h @@ -171,7 +171,6 @@ struct forw_packet { unsigned long send_time; uint8_t own; struct sk_buff *skb; - unsigned char *packet_buff; uint16_t packet_len; uint32_t direct_link_flags; uint8_t num_packets;