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qlcnic: limit skb frags for non tso packet 

Machines are getting deadlock in four node cluster environment.
All nodes are accessing (find /gfs2 -depth -print|cpio -ocv > /dev/null)
200 GB storage on a GFS2 filesystem.
This result in memory fragmentation and driver receives 18 frags for
1448 byte packets.
For non tso packet, fw drops the tx request, if it has >14 frags.

Fixing it by pulling extra frags.

Cc: stable@kernel.org
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amit Kumar Salecha 2011-04-12 17:05:55 +00:00 committed by David S. Miller
parent 7c9f6472d4
commit 91a403caf0
2 changed files with 15 additions and 0 deletions
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1
drivers/net/qlcnic/qlcnic.h
View File

@ -99,6 +99,7 @@
#define TX_UDPV6_PKT 0x0c #define TX_UDPV6_PKT 0x0c
/* Tx defines */ /* Tx defines */
#define QLCNIC_MAX_FRAGS_PER_TX 14
#define MAX_TSO_HEADER_DESC 2 #define MAX_TSO_HEADER_DESC 2
#define MGMT_CMD_DESC_RESV 4 #define MGMT_CMD_DESC_RESV 4
#define TX_STOP_THRESH ((MAX_SKB_FRAGS >> 2) + MAX_TSO_HEADER_DESC \ #define TX_STOP_THRESH ((MAX_SKB_FRAGS >> 2) + MAX_TSO_HEADER_DESC \

14
drivers/net/qlcnic/qlcnic_main.c
View File

@ -2099,6 +2099,7 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
struct cmd_desc_type0 *hwdesc, *first_desc; struct cmd_desc_type0 *hwdesc, *first_desc;
struct pci_dev *pdev; struct pci_dev *pdev;
struct ethhdr *phdr; struct ethhdr *phdr;
int delta = 0;
int i, k; int i, k;
u32 producer; u32 producer;
@ -2118,6 +2119,19 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
} }
frag_count = skb_shinfo(skb)->nr_frags + 1; frag_count = skb_shinfo(skb)->nr_frags + 1;
/* 14 frags supported for normal packet and
* 32 frags supported for TSO packet
*/
if (!skb_is_gso(skb) && frag_count > QLCNIC_MAX_FRAGS_PER_TX) {
for (i = 0; i < (frag_count - QLCNIC_MAX_FRAGS_PER_TX); i++)
delta += skb_shinfo(skb)->frags[i].size;
if (!__pskb_pull_tail(skb, delta))
goto drop_packet;
frag_count = 1 + skb_shinfo(skb)->nr_frags;
}
/* 4 fragments per cmd des */ /* 4 fragments per cmd des */
no_of_desc = (frag_count + 3) >> 2; no_of_desc = (frag_count + 3) >> 2;