Commit 5a924b89 authored by David Howells's avatar David Howells
Browse files

rxrpc: Don't store the rxrpc header in the Tx queue sk_buffs 



Don't store the rxrpc protocol header in sk_buffs on the transmit queue,
but rather generate it on the fly and pass it to kernel_sendmsg() as a
separate iov.  This reduces the amount of storage required.

Note that the security header is still stored in the sk_buff as it may get
encrypted along with the data (and doesn't change with each transmission).

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 2d7a8926

net/rxrpc/ar-internal.h

+2 −3
Original line number Diff line number Diff line
@@ -385,10 +385,9 @@ struct rxrpc_connection { 
	int			debug_id;	/* debug ID for printks */

	atomic_t		serial;		/* packet serial number counter */

	unsigned int		hi_serial;	/* highest serial number received */

	u32			security_nonce;	/* response re-use preventer */

	u8			size_align;	/* data size alignment (for security) */

	u8			header_size;	/* rxrpc + security header size */

	u8			security_size;	/* security header size */

	u32			security_nonce;	/* response re-use preventer */

	u8			security_ix;	/* security type */

	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */

};
@@ -946,7 +945,7 @@ extern const s8 rxrpc_ack_priority[]; 
 * output.c

 */

int rxrpc_send_call_packet(struct rxrpc_call *, u8);

int rxrpc_send_data_packet(struct rxrpc_connection *, struct sk_buff *);

int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *);

void rxrpc_reject_packets(struct rxrpc_local *);



/*

net/rxrpc/call_event.c

+2 −9
Original line number Diff line number Diff line
@@ -139,7 +139,6 @@ void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, 
 */

static void rxrpc_resend(struct rxrpc_call *call)

{

	struct rxrpc_wire_header *whdr;

	struct rxrpc_skb_priv *sp;

	struct sk_buff *skb;

	rxrpc_seq_t cursor, seq, top;
@@ -201,15 +200,8 @@ static void rxrpc_resend(struct rxrpc_call *call) 
		skb = call->rxtx_buffer[ix];

		rxrpc_get_skb(skb, rxrpc_skb_tx_got);

		spin_unlock_bh(&call->lock);

		sp = rxrpc_skb(skb);



		/* Each Tx packet needs a new serial number */

		sp->hdr.serial = atomic_inc_return(&call->conn->serial);



		whdr = (struct rxrpc_wire_header *)skb->head;

		whdr->serial = htonl(sp->hdr.serial);



		if (rxrpc_send_data_packet(call->conn, skb) < 0) {

		if (rxrpc_send_data_packet(call, skb) < 0) {

			call->resend_at = now + 2;

			rxrpc_free_skb(skb, rxrpc_skb_tx_freed);

			return;
@@ -217,6 +209,7 @@ static void rxrpc_resend(struct rxrpc_call *call) 


		if (rxrpc_is_client_call(call))

			rxrpc_expose_client_call(call);

		sp = rxrpc_skb(skb);

		sp->resend_at = now + rxrpc_resend_timeout;



		rxrpc_free_skb(skb, rxrpc_skb_tx_freed);

net/rxrpc/conn_object.c

+0 −1
Original line number Diff line number Diff line
@@ -53,7 +53,6 @@ struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) 
		spin_lock_init(&conn->state_lock);

		conn->debug_id = atomic_inc_return(&rxrpc_debug_id);

		conn->size_align = 4;

		conn->header_size = sizeof(struct rxrpc_wire_header);

		conn->idle_timestamp = jiffies;

	}

net/rxrpc/output.c

+56 −27
Original line number Diff line number Diff line
@@ -208,19 +208,42 @@ out: 
/*

 * send a packet through the transport endpoint

 */

int rxrpc_send_data_packet(struct rxrpc_connection *conn, struct sk_buff *skb)

int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb)

{

	struct kvec iov[1];

	struct rxrpc_connection *conn = call->conn;

	struct rxrpc_wire_header whdr;

	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);

	struct msghdr msg;

	struct kvec iov[2];

	rxrpc_serial_t serial;

	size_t len;

	int ret, opt;



	_enter(",{%d}", skb->len);



	iov[0].iov_base = skb->head;

	iov[0].iov_len = skb->len;

	/* Each transmission of a Tx packet needs a new serial number */

	serial = atomic_inc_return(&conn->serial);



	whdr.epoch	= htonl(conn->proto.epoch);

	whdr.cid	= htonl(call->cid);

	whdr.callNumber	= htonl(call->call_id);

	whdr.seq	= htonl(sp->hdr.seq);

	whdr.serial	= htonl(serial);

	whdr.type	= RXRPC_PACKET_TYPE_DATA;

	whdr.flags	= sp->hdr.flags;

	whdr.userStatus	= 0;

	whdr.securityIndex = call->security_ix;

	whdr._rsvd	= htons(sp->hdr._rsvd);

	whdr.serviceId	= htons(call->service_id);



	msg.msg_name = &conn->params.peer->srx.transport;

	msg.msg_namelen = conn->params.peer->srx.transport_len;

	iov[0].iov_base = &whdr;

	iov[0].iov_len = sizeof(whdr);

	iov[1].iov_base = skb->head;

	iov[1].iov_len = skb->len;

	len = iov[0].iov_len + iov[1].iov_len;



	msg.msg_name = &call->peer->srx.transport;

	msg.msg_namelen = call->peer->srx.transport_len;

	msg.msg_control = NULL;

	msg.msg_controllen = 0;

	msg.msg_flags = 0;
@@ -234,9 +257,13 @@ int rxrpc_send_data_packet(struct rxrpc_connection *conn, struct sk_buff *skb) 
		}

	}



	_proto("Tx DATA %%%u { #%u }", serial, sp->hdr.seq);



	/* send the packet with the don't fragment bit set if we currently

	 * think it's small enough */

	if (skb->len - sizeof(struct rxrpc_wire_header) < conn->params.peer->maxdata) {

	if (iov[1].iov_len >= call->peer->maxdata)

		goto send_fragmentable;



	down_read(&conn->params.local->defrag_sem);

	/* send the packet by UDP

	 * - returns -EMSGSIZE if UDP would have to fragment the packet
@@ -244,16 +271,19 @@ int rxrpc_send_data_packet(struct rxrpc_connection *conn, struct sk_buff *skb) 
	 *   - in which case, we'll have processed the ICMP error

	 *     message and update the peer record

	 */

		ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 1,

				     iov[0].iov_len);

	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);



	up_read(&conn->params.local->defrag_sem);

	if (ret == -EMSGSIZE)

		goto send_fragmentable;



		_leave(" = %d [%u]", ret, conn->params.peer->maxdata);

		return ret;

done:

	if (ret == 0) {

		sp->resend_at = jiffies + rxrpc_resend_timeout;

		sp->hdr.serial = serial;

	}

	_leave(" = %d [%u]", ret, call->peer->maxdata);

	return ret;



send_fragmentable:

	/* attempt to send this message with fragmentation enabled */
@@ -268,8 +298,8 @@ send_fragmentable: 
					SOL_IP, IP_MTU_DISCOVER,

					(char *)&opt, sizeof(opt));

		if (ret == 0) {

			ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 1,

					     iov[0].iov_len);

			ret = kernel_sendmsg(conn->params.local->socket, &msg,

					     iov, 2, len);



			opt = IP_PMTUDISC_DO;

			kernel_setsockopt(conn->params.local->socket, SOL_IP,
@@ -298,8 +328,7 @@ send_fragmentable: 
	}



	up_write(&conn->params.local->defrag_sem);

	_leave(" = %d [frag %u]", ret, conn->params.peer->maxdata);

	return ret;

	goto done;

}



/*

net/rxrpc/rxkad.c

+3 −5
Original line number Diff line number Diff line
@@ -80,12 +80,10 @@ static int rxkad_init_connection_security(struct rxrpc_connection *conn) 
	case RXRPC_SECURITY_AUTH:

		conn->size_align = 8;

		conn->security_size = sizeof(struct rxkad_level1_hdr);

		conn->header_size += sizeof(struct rxkad_level1_hdr);

		break;

	case RXRPC_SECURITY_ENCRYPT:

		conn->size_align = 8;

		conn->security_size = sizeof(struct rxkad_level2_hdr);

		conn->header_size += sizeof(struct rxkad_level2_hdr);

		break;

	default:

		ret = -EKEYREJECTED;
@@ -161,7 +159,7 @@ static int rxkad_secure_packet_auth(const struct rxrpc_call *call, 


	_enter("");



	check = sp->hdr.seq ^ sp->hdr.callNumber;

	check = sp->hdr.seq ^ call->call_id;

	data_size |= (u32)check << 16;



	hdr.data_size = htonl(data_size);
@@ -205,7 +203,7 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call, 


	_enter("");



	check = sp->hdr.seq ^ sp->hdr.callNumber;

	check = sp->hdr.seq ^ call->call_id;



	rxkhdr.data_size = htonl(data_size | (u32)check << 16);

	rxkhdr.checksum = 0;
@@ -277,7 +275,7 @@ static int rxkad_secure_packet(struct rxrpc_call *call, 
	/* calculate the security checksum */

	x = (call->cid & RXRPC_CHANNELMASK) << (32 - RXRPC_CIDSHIFT);

	x |= sp->hdr.seq & 0x3fffffff;

	call->crypto_buf[0] = htonl(sp->hdr.callNumber);

	call->crypto_buf[0] = htonl(call->call_id);

	call->crypto_buf[1] = htonl(x);



	sg_init_one(&sg, call->crypto_buf, 8);

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