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Message-ID: <20080329060655.GA15023@tp64>
Date: Sat, 29 Mar 2008 15:06:55 +0900
From: Joonwoo Park <joonwpark81@...il.com>
To: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
Joonwoo Park <joonwpark81@...il.com>
Subject: Re: [PATCH 1/3] [LLC]: skb allocation size for responses
On Fri, Mar 28, 2008 at 10:12:02AM -0300, Arnaldo Carvalho de Melo wrote:
>
> > +static int llc_mac_header_len(unsigned short devtype)
> > +{
> > + switch (devtype) {
> > + case ARPHRD_ETHER:
> > + case ARPHRD_LOOPBACK:
> > + return sizeof(struct ethhdr);
> > + }
> > +
> > + return __llc_tr_mac_header_len(devtype);
> > +}
>
> Nah, just drop __llc_tr_mac_header_len altogether and have another case
> entry for ARPHDR_IEEE802_TR.
>
> > /**
> > * llc_alloc_frame - allocates sk_buff for frame
> > * @dev: network device this skb will be sent over
> > + * @type: pdu type to allocate
> > + * @data_size: data size to allocate
> > *
> > * Allocates an sk_buff for frame and initializes sk_buff fields.
> > * Returns allocated skb or %NULL when out of memory.
> > */
> > -struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev)
> > +struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev,
> > + u8 type, u32 data_size)
> > {
> > - struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
> > + int hlen = type == LLC_PDU_TYPE_U ? 3 : 4;
> > + struct sk_buff *skb;
> > +
> > + hlen += llc_mac_header_len(dev->type);
> > + skb = alloc_skb(hlen + data_size, GFP_ATOMIC);
> >
> > if (skb) {
> > skb_reset_mac_header(skb);
> > - skb_reserve(skb, 50);
> > + skb_reserve(skb, hlen);
>
> Well done, now it is better documented (LLC_PDU_TYPE_U passed) and uses
> less memory, no more magic numbers, good.
>
> - Arnaldo
I've respined the patch, thanks Arnaldo.
---
[LLC]: skb allocation size for responses
Allocate the skb for llc responses with the received packet size by
using the size adjustable llc_frame_alloc.
Don't allocate useless extra payload.
Cleanup magic numbers.
So, this fixes oops.
Reported by Jim Westfall:
kernel: skb_over_panic: text:c0541fc7 len:1000 put:997 head:c166ac00 data:c166ac2f tail:0xc166b017 end:0xc166ac80 dev:eth0
kernel: ------------[ cut here ]------------
kernel: kernel BUG at net/core/skbuff.c:95!
Signed-off-by: Joonwoo Park <joonwpark81@...il.com>
---
include/net/llc_pdu.h | 4 ++--
include/net/llc_sap.h | 7 +++++--
net/llc/llc_c_ac.c | 47 +++++++++++++++++++++++++----------------------
net/llc/llc_pdu.c | 2 +-
net/llc/llc_s_ac.c | 9 +++++++--
net/llc/llc_sap.c | 27 ++++++++++++++++++++++++---
net/llc/llc_station.c | 13 ++++++++++---
7 files changed, 74 insertions(+), 35 deletions(-)
diff --git a/include/net/llc_pdu.h b/include/net/llc_pdu.h
index 4a8f58b..75b8e29 100644
--- a/include/net/llc_pdu.h
+++ b/include/net/llc_pdu.h
@@ -381,7 +381,7 @@ static inline void llc_pdu_init_as_xid_cmd(struct sk_buff *skb,
xid_info->fmt_id = LLC_XID_FMT_ID; /* 0x81 */
xid_info->type = svcs_supported;
xid_info->rw = rx_window << 1; /* size of receive window */
- skb_put(skb, 3);
+ skb_put(skb, sizeof(struct llc_xid_info));
}
/**
@@ -406,7 +406,7 @@ static inline void llc_pdu_init_as_xid_rsp(struct sk_buff *skb,
xid_info->fmt_id = LLC_XID_FMT_ID;
xid_info->type = svcs_supported;
xid_info->rw = rx_window << 1;
- skb_put(skb, 3);
+ skb_put(skb, sizeof(struct llc_xid_info));
}
/* LLC Type 2 FRMR response information field format */
diff --git a/include/net/llc_sap.h b/include/net/llc_sap.h
index 2c56dbe..ed25bec 100644
--- a/include/net/llc_sap.h
+++ b/include/net/llc_sap.h
@@ -1,5 +1,8 @@
#ifndef LLC_SAP_H
#define LLC_SAP_H
+
+#include <asm/types.h>
+
/*
* Copyright (c) 1997 by Procom Technology,Inc.
* 2001-2003 by Arnaldo Carvalho de Melo <acme@...ectiva.com.br>
@@ -19,8 +22,8 @@ struct sock;
extern void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb);
extern void llc_save_primitive(struct sock *sk, struct sk_buff* skb,
unsigned char prim);
-extern struct sk_buff *llc_alloc_frame(struct sock *sk,
- struct net_device *dev);
+extern struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev,
+ u8 type, u32 data_size);
extern void llc_build_and_send_test_pkt(struct llc_sap *sap,
struct sk_buff *skb,
diff --git a/net/llc/llc_c_ac.c b/net/llc/llc_c_ac.c
index 860140c..71a0022 100644
--- a/net/llc/llc_c_ac.c
+++ b/net/llc/llc_c_ac.c
@@ -198,7 +198,7 @@ int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -223,7 +223,7 @@ int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -249,7 +249,7 @@ int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -282,7 +282,8 @@ int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
llc_pdu_decode_pf_bit(skb, &f_bit);
else
f_bit = 0;
- nskb = llc_alloc_frame(sk, llc->dev);
+ nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
+ sizeof(struct llc_frmr_info));
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -306,7 +307,8 @@ int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
+ sizeof(struct llc_frmr_info));
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -336,7 +338,8 @@ int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
struct llc_sock *llc = llc_sk(sk);
llc_pdu_decode_pf_bit(skb, &f_bit);
- nskb = llc_alloc_frame(sk, llc->dev);
+ nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U,
+ sizeof(struct llc_frmr_info));
if (nskb) {
struct llc_sap *sap = llc->sap;
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
@@ -424,7 +427,7 @@ int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -459,7 +462,7 @@ int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -483,7 +486,7 @@ int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -507,7 +510,7 @@ int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -531,7 +534,7 @@ int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -555,7 +558,7 @@ int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -579,7 +582,7 @@ int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -615,7 +618,7 @@ int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -639,7 +642,7 @@ int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -663,7 +666,7 @@ int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -688,7 +691,7 @@ int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -712,7 +715,7 @@ int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -736,7 +739,7 @@ int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -770,7 +773,7 @@ int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
@@ -799,7 +802,7 @@ int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
u8 f_bit;
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0);
llc_pdu_decode_pf_bit(skb, &f_bit);
if (nskb) {
@@ -956,7 +959,7 @@ static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
{
int rc = -ENOBUFS;
struct llc_sock *llc = llc_sk(sk);
- struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
+ struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0);
if (nskb) {
struct llc_sap *sap = llc->sap;
diff --git a/net/llc/llc_pdu.c b/net/llc/llc_pdu.c
index fa83243..2e6cb79 100644
--- a/net/llc/llc_pdu.c
+++ b/net/llc/llc_pdu.c
@@ -241,7 +241,7 @@ void llc_pdu_init_as_frmr_rsp(struct sk_buff *skb, struct llc_pdu_sn *prev_pdu,
FRMR_INFO_SET_PDU_INFO_2LONG_IND(frmr_info, vzyxw);
FRMR_INFO_SET_PDU_INVALID_Nr_IND(frmr_info, vzyxw);
FRMR_INFO_SET_PDU_INVALID_Ns_IND(frmr_info, vzyxw);
- skb_put(skb, 5);
+ skb_put(skb, sizeof(struct llc_frmr_info));
}
/**
diff --git a/net/llc/llc_s_ac.c b/net/llc/llc_s_ac.c
index ac3d93b..a94bd56 100644
--- a/net/llc/llc_s_ac.c
+++ b/net/llc/llc_s_ac.c
@@ -103,7 +103,8 @@ int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb)
llc_pdu_decode_sa(skb, mac_da);
llc_pdu_decode_da(skb, mac_sa);
llc_pdu_decode_ssap(skb, &dsap);
- nskb = llc_alloc_frame(NULL, skb->dev);
+ nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
+ sizeof(struct llc_xid_info));
if (!nskb)
goto out;
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
@@ -144,11 +145,15 @@ int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb)
u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap;
struct sk_buff *nskb;
int rc = 1;
+ u32 data_size;
llc_pdu_decode_sa(skb, mac_da);
llc_pdu_decode_da(skb, mac_sa);
llc_pdu_decode_ssap(skb, &dsap);
- nskb = llc_alloc_frame(NULL, skb->dev);
+
+ /* The test request command is type U (llc_len = 3) */
+ data_size = ntohs(eth_hdr(skb)->h_proto) - 3;
+ nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, data_size);
if (!nskb)
goto out;
llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 2525165..65799b1 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -24,20 +24,41 @@
#include <net/tcp_states.h>
#include <linux/llc.h>
+static int llc_mac_header_len(unsigned short devtype)
+{
+ switch (devtype) {
+ case ARPHRD_ETHER:
+ case ARPHRD_LOOPBACK:
+ return sizeof(struct ethhdr);
+#ifdef CONFIG_TR
+ case ARPHDR_IEEE802_TR:
+ return sizeof(struct thr_hdr);
+#endif
+ }
+ return 0;
+}
+
/**
* llc_alloc_frame - allocates sk_buff for frame
* @dev: network device this skb will be sent over
+ * @type: pdu type to allocate
+ * @data_size: data size to allocate
*
* Allocates an sk_buff for frame and initializes sk_buff fields.
* Returns allocated skb or %NULL when out of memory.
*/
-struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev)
+struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev,
+ u8 type, u32 data_size)
{
- struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
+ int hlen = type == LLC_PDU_TYPE_U ? 3 : 4;
+ struct sk_buff *skb;
+
+ hlen += llc_mac_header_len(dev->type);
+ skb = alloc_skb(hlen + data_size, GFP_ATOMIC);
if (skb) {
skb_reset_mac_header(skb);
- skb_reserve(skb, 50);
+ skb_reserve(skb, hlen);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
skb->protocol = htons(ETH_P_802_2);
diff --git a/net/llc/llc_station.c b/net/llc/llc_station.c
index 959e7f3..83da133 100644
--- a/net/llc/llc_station.c
+++ b/net/llc/llc_station.c
@@ -253,7 +253,8 @@ static int llc_station_ac_inc_xid_r_cnt_by_1(struct sk_buff *skb)
static int llc_station_ac_send_null_dsap_xid_c(struct sk_buff *skb)
{
int rc = 1;
- struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev);
+ struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
+ sizeof(struct llc_xid_info));
if (!nskb)
goto out;
@@ -274,7 +275,8 @@ static int llc_station_ac_send_xid_r(struct sk_buff *skb)
{
u8 mac_da[ETH_ALEN], dsap;
int rc = 1;
- struct sk_buff* nskb = llc_alloc_frame(NULL, skb->dev);
+ struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
+ sizeof(struct llc_xid_info));
if (!nskb)
goto out;
@@ -298,7 +300,12 @@ static int llc_station_ac_send_test_r(struct sk_buff *skb)
{
u8 mac_da[ETH_ALEN], dsap;
int rc = 1;
- struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev);
+ u32 data_size;
+ struct sk_buff *nskb;
+
+ /* The test request command is type U (llc_len = 3) */
+ data_size = ntohs(eth_hdr(skb)->h_proto) - 3;
+ nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, data_size);
if (!nskb)
goto out;
--
1.5.4.3
---
--
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