2007-11-27 21:30:34

by Divy Le ray

Subject: [PATCH 1/3] cxgb - fix T2 GSO

From: Divy Le Ray <[email protected]>

The patch ensures that a GSO skb has enough headroom
to push an encapsulating cpl_tx_pkt_lso header.

Signed-off-by: Divy Le Ray <[email protected]>
---

drivers/net/chelsio/cxgb2.c | 3 ++-
drivers/net/chelsio/sge.c | 34 +++++++++++++++-------------------
drivers/net/chelsio/sge.h | 1 +
3 files changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/net/chelsio/cxgb2.c b/drivers/net/chelsio/cxgb2.c
old mode 100644
new mode 100755
index 2dbf8dc..2461f91
--- a/drivers/net/chelsio/cxgb2.c
+++ b/drivers/net/chelsio/cxgb2.c
@@ -401,7 +401,8 @@ static char stats_strings[][ETH_GSTRING_LEN] = {
"TxTso",
"RxVlan",
"TxVlan",
-
+ "TxNeedHeadroom",
+
/* Interrupt stats */
"rx drops",
"pure_rsps",
diff --git a/drivers/net/chelsio/sge.c b/drivers/net/chelsio/sge.c
old mode 100644
new mode 100755
index 4436662..e8b1036
--- a/drivers/net/chelsio/sge.c
+++ b/drivers/net/chelsio/sge.c
@@ -991,6 +991,7 @@ void t1_sge_get_port_stats(const struct sge *sge, int port,
ss->tx_packets += st->tx_packets;
ss->tx_cso += st->tx_cso;
ss->tx_tso += st->tx_tso;
+ ss->tx_need_hdrroom += st->tx_need_hdrroom;
ss->vlan_xtract += st->vlan_xtract;
ss->vlan_insert += st->vlan_insert;
}
@@ -1848,7 +1849,8 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct adapter *adapter = dev->priv;
struct sge *sge = adapter->sge;
- struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[dev->if_port], smp_processor_id());
+ struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[dev->if_port],
+ smp_processor_id());
struct cpl_tx_pkt *cpl;
struct sk_buff *orig_skb = skb;
int ret;
@@ -1856,6 +1858,18 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (skb->protocol == htons(ETH_P_CPL5))
goto send;

+ /*
+ * We are using a non-standard hard_header_len.
+ * Allocate more header room in the rare cases it is not big enough.
+ */
+ if (unlikely(skb_headroom(skb) < dev->hard_header_len - ETH_HLEN)) {
+ skb = skb_realloc_headroom(skb, sizeof(struct cpl_tx_pkt_lso));
+ ++st->tx_need_hdrroom;
+ dev_kfree_skb_any(orig_skb);
+ if (!skb)
+ return NETDEV_TX_OK;
+ }
+
if (skb_shinfo(skb)->gso_size) {
int eth_type;
struct cpl_tx_pkt_lso *hdr;
@@ -1889,24 +1903,6 @@ int t1_start_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
}

- /*
- * We are using a non-standard hard_header_len and some kernel
- * components, such as pktgen, do not handle it right.
- * Complain when this happens but try to fix things up.
- */
- if (unlikely(skb_headroom(skb) < dev->hard_header_len - ETH_HLEN)) {
- pr_debug("%s: headroom %d header_len %d\n", dev->name,
- skb_headroom(skb), dev->hard_header_len);
-
- if (net_ratelimit())
- printk(KERN_ERR "%s: inadequate headroom in "
- "Tx packet\n", dev->name);
- skb = skb_realloc_headroom(skb, sizeof(*cpl));
- dev_kfree_skb_any(orig_skb);
- if (!skb)
- return NETDEV_TX_OK;
- }
-
if (!(adapter->flags & UDP_CSUM_CAPABLE) &&
skb->ip_summed == CHECKSUM_PARTIAL &&
ip_hdr(skb)->protocol == IPPROTO_UDP) {
diff --git a/drivers/net/chelsio/sge.h b/drivers/net/chelsio/sge.h
old mode 100644
new mode 100755
index 713d9c5..285bbb2
--- a/drivers/net/chelsio/sge.h
+++ b/drivers/net/chelsio/sge.h
@@ -64,6 +64,7 @@ struct sge_port_stats {
u64 tx_tso; /* # of TSO requests */
u64 vlan_xtract; /* # of VLAN tag extractions */
u64 vlan_insert; /* # of VLAN tag insertions */
+ u64 tx_need_hdrroom; /* # of TX skbs in need of more header room */
};

struct sk_buff;

2007-12-01 21:34:26

by Jeff Garzik

Subject: Re: [PATCH 1/3] cxgb - fix T2 GSO

Divy Le Ray wrote:
> From: Divy Le Ray <[email protected]>
>
> The patch ensures that a GSO skb has enough headroom
> to push an encapsulating cpl_tx_pkt_lso header.
>
> Signed-off-by: Divy Le Ray <[email protected]>
> ---

applied 1-3