From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from codeconstruct.com.au (pi.codeconstruct.com.au [203.29.241.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 47620219A72 for ; Wed, 2 Jul 2025 06:20:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.29.241.158 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751437219; cv=none; b=M7UMX6vxspnCh+bT8VxlWyxWBrX2B8JQ+TvrnQLBq2FWmpD0B7cbEfajZOGk95kdZpGBLezFSTkRCdPMw4XXVP5s5qp5c+CetELIkR5e0cUoZPf28f668391pl+f2ux07/CBuqMb9Gd2ZCZfZIOX0+vBeuAU4zBHF3Ah0vJz33I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751437219; c=relaxed/simple; bh=a/1+M1jC0kd4WZVP3rylR7/RjqZyKIah73CwCMn/7L8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ABBXyBk0pnWQ525EOSW2O4X9bTK4Ek3anG/KMDOGhtV3+rZ4bap7k1CrjU3MMdRJR6UHzM8ejJ06YtydZ+HW5Msf5kU5ZHLT7tjUI2mzYOLHVFvdK8OBthAzG4r6Wp8Garcmc6PbAi20COivx1pe0r81jQa1EReLoRt6X7kRuHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au; spf=pass smtp.mailfrom=codeconstruct.com.au; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b=I60nAe8G; arc=none smtp.client-ip=203.29.241.158 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codeconstruct.com.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeconstruct.com.au header.i=@codeconstruct.com.au header.b="I60nAe8G" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=codeconstruct.com.au; s=2022a; t=1751437216; bh=avIH7c+QO/p4RJ0P5hNXZGZpemhtMcYp/AFYmdsQTCw=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=I60nAe8GPtzAUiJ7twTuuPP3xasNJ6Gw7pDy7NueSTUHMbMP0TP7gxOc6mc/ly4Dl 66o3gfxZKSop7+myoArtnes9CYV9Z6dHRCr8opxLKRO7rA7q75OrHgpVXST3MLfQEa kVEtqllIYnM7sTXQRNkiYqOqUHeMFZSmL5PGqbzxb+L16nP2GhBD+2WFvsZU6wUMNa bNxWqak2hNR8PPbAsMAvN0zjNtASNd35rRXFpmmPRams7Jj1EAUXHX4gdkqVENwI3h O+MWfd5ax2l/YPtOpXkoFygF8wqHP3ubtEM1yTSsjQjLWDO6//2qTB5UFPYOXhHDFk 0EjV4Zw0I0ggQ== Received: by codeconstruct.com.au (Postfix, from userid 10000) id 341A86A70B; Wed, 2 Jul 2025 14:20:16 +0800 (AWST) From: Jeremy Kerr Date: Wed, 02 Jul 2025 14:20:04 +0800 Subject: [PATCH net-next v5 04/14] net: mctp: separate cb from direct-addressing routing Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250702-dev-forwarding-v5-4-1468191da8a4@codeconstruct.com.au> References: <20250702-dev-forwarding-v5-0-1468191da8a4@codeconstruct.com.au> In-Reply-To: <20250702-dev-forwarding-v5-0-1468191da8a4@codeconstruct.com.au> To: Matt Johnston , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: netdev@vger.kernel.org X-Mailer: b4 0.14.2 Now that we have the dst->haddr populated by sendmsg (when extended addressing is in use), we no longer need to stash the link-layer address in the skb->cb. Instead, only use skb->cb for incoming lladdr data. While we're at it: remove cb->src, as was never used. Signed-off-by: Jeremy Kerr --- include/net/mctp.h | 4 ++-- net/mctp/route.c | 21 +++++---------------- 2 files changed, 7 insertions(+), 18 deletions(-) diff --git a/include/net/mctp.h b/include/net/mctp.h index 6c9c5c48f59a1bf45f9c9d274a3ca2b633e96c75..b3af0690f60749a9bf9f489c7118c82cfd9d577e 100644 --- a/include/net/mctp.h +++ b/include/net/mctp.h @@ -183,8 +183,8 @@ struct mctp_sk_key { struct mctp_skb_cb { unsigned int magic; unsigned int net; - int ifindex; /* extended/direct addressing if set */ - mctp_eid_t src; + /* fields below provide extended addressing for ingress to recvmsg() */ + int ifindex; unsigned char halen; unsigned char haddr[MAX_ADDR_LEN]; }; diff --git a/net/mctp/route.c b/net/mctp/route.c index 3985388a6035377c04c4e4f183c4fceca8111917..23f339b4364316817b90b4fb2952c9eac445dd24 100644 --- a/net/mctp/route.c +++ b/net/mctp/route.c @@ -561,35 +561,28 @@ static int mctp_dst_input(struct mctp_dst *dst, struct sk_buff *skb) static int mctp_dst_output(struct mctp_dst *dst, struct sk_buff *skb) { - struct mctp_skb_cb *cb = mctp_cb(skb); struct mctp_hdr *hdr = mctp_hdr(skb); char daddr_buf[MAX_ADDR_LEN]; char *daddr = NULL; int rc; skb->protocol = htons(ETH_P_MCTP); + skb->pkt_type = PACKET_OUTGOING; if (skb->len > dst->mtu) { kfree_skb(skb); return -EMSGSIZE; } - /* If we're forwarding, we don't want to use the input path's cb, - * as it holds the *source* hardware addressing information. - * - * We will have a PACKET_HOST skb from the dev, or PACKET_OUTGOING - * from a socket; only use cb in the latter case. - */ - if (skb->pkt_type == PACKET_OUTGOING && cb->ifindex) { - /* direct route; use the hwaddr we stashed in sendmsg */ - if (cb->halen != skb->dev->addr_len) { + /* direct route; use the hwaddr we stashed in sendmsg */ + if (dst->halen) { + if (dst->halen != skb->dev->addr_len) { /* sanity check, sendmsg should have already caught this */ kfree_skb(skb); return -EMSGSIZE; } - daddr = cb->haddr; + daddr = dst->haddr; } else { - skb->pkt_type = PACKET_OUTGOING; /* If lookup fails let the device handle daddr==NULL */ if (mctp_neigh_lookup(dst->dev, hdr->dest, daddr_buf) == 0) daddr = daddr_buf; @@ -1009,7 +1002,6 @@ int mctp_local_output(struct sock *sk, struct mctp_dst *dst, struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag) { struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk); - struct mctp_skb_cb *cb = mctp_cb(skb); struct mctp_sk_key *key; struct mctp_hdr *hdr; unsigned long flags; @@ -1064,9 +1056,6 @@ int mctp_local_output(struct sock *sk, struct mctp_dst *dst, skb_reset_network_header(skb); skb->dev = dst->dev->dev; - /* cb->net will have been set on initial ingress */ - cb->src = saddr; - /* set up common header fields */ hdr = mctp_hdr(skb); hdr->ver = 1; -- 2.39.5