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authorFrank Blaschka <frank.blaschka@de.ibm.com>2010-06-21 22:57:10 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-23 13:16:36 -0700
commit51aa165c9f27bbfff498e4d56f3eadf17d74c476 (patch)
treec2af4e7f534c697f1fc8c14e053f679596a507bf /drivers/s390/net/qeth_l3_main.c
parent43a65303fe530afe4daf1c0fd6875fdba7090f91 (diff)
qeth: fix page breaks in hw headers
Turning on memory debugging showed there could be page breaks in hardware headers. OSA does not allow this so we had to add code to bounce the header in case there is a page break. This patch also fixes a problem in case the skb->data part of a fragmented skb spreads multiple pages. Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net/qeth_l3_main.c')
-rw-r--r--drivers/s390/net/qeth_l3_main.c26
1 files changed, 13 insertions, 13 deletions
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index b5733e405ed..61d348e5192 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2904,19 +2904,11 @@ static inline int qeth_l3_tso_elements(struct sk_buff *skb)
unsigned long tcpd = (unsigned long)tcp_hdr(skb) +
tcp_hdr(skb)->doff * 4;
int tcpd_len = skb->len - (tcpd - (unsigned long)skb->data);
- int elements = PFN_UP(tcpd + tcpd_len) - PFN_DOWN(tcpd);
+ int elements = PFN_UP(tcpd + tcpd_len - 1) - PFN_DOWN(tcpd);
elements += skb_shinfo(skb)->nr_frags;
return elements;
}
-static inline int qeth_l3_tso_check(struct sk_buff *skb)
-{
- int len = ((unsigned long)tcp_hdr(skb) + tcp_hdr(skb)->doff * 4) -
- (unsigned long)skb->data;
- return (((unsigned long)skb->data & PAGE_MASK) !=
- (((unsigned long)skb->data + len) & PAGE_MASK));
-}
-
static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
int rc;
@@ -3016,8 +3008,6 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
(cast_type == RTN_UNSPEC)) {
hdr = (struct qeth_hdr *)skb_push(new_skb,
sizeof(struct qeth_hdr_tso));
- if (qeth_l3_tso_check(new_skb))
- QETH_DBF_MESSAGE(2, "tso skb misaligned\n");
memset(hdr, 0, sizeof(struct qeth_hdr_tso));
qeth_l3_fill_header(card, hdr, new_skb, ipv, cast_type);
qeth_tso_fill_header(card, hdr, new_skb);
@@ -3048,10 +3038,20 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
elements_needed += elems;
nr_frags = skb_shinfo(new_skb)->nr_frags;
- if (card->info.type != QETH_CARD_TYPE_IQD)
+ if (card->info.type != QETH_CARD_TYPE_IQD) {
+ int len;
+ if (large_send == QETH_LARGE_SEND_TSO)
+ len = ((unsigned long)tcp_hdr(new_skb) +
+ tcp_hdr(new_skb)->doff * 4) -
+ (unsigned long)new_skb->data;
+ else
+ len = sizeof(struct qeth_hdr_layer3);
+
+ if (qeth_hdr_chk_and_bounce(new_skb, len))
+ goto tx_drop;
rc = qeth_do_send_packet(card, queue, new_skb, hdr,
elements_needed);
- else
+ } else
rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
elements_needed, data_offset, 0);