AcoSail/kernel_optimize_test
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netxen: limit skb frags for non tso packet

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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 salecha 2011-04-11 02:10:22 +00:00 committed by David S. Miller
parent 77c8e2c015
commit c968bdf691
2 changed files with 19 additions and 2 deletions
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4
drivers/net/netxen/netxen_nic.h
View File

@ -174,7 +174,7 @@
#define MAX_NUM_CARDS 4
#define MAX_BUFFERS_PER_CMD 32
#define NETXEN_MAX_FRAGS_PER_TX 14
#define MAX_TSO_HEADER_DESC 2
#define MGMT_CMD_DESC_RESV 4
#define TX_STOP_THRESH ((MAX_SKB_FRAGS >> 2) + MAX_TSO_HEADER_DESC \
@ -558,7 +558,7 @@ struct netxen_recv_crb {
*/
struct netxen_cmd_buffer {
struct sk_buff *skb;
struct netxen_skb_frag frag_array[MAX_BUFFERS_PER_CMD + 1];
struct netxen_skb_frag frag_array[MAX_SKB_FRAGS + 1];
u32 frag_count;
};

17
drivers/net/netxen/netxen_nic_main.c
View File

@ -1844,6 +1844,8 @@ netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
struct cmd_desc_type0 *hwdesc, *first_desc;
struct pci_dev *pdev;
int i, k;
int delta = 0;
struct skb_frag_struct *frag;
u32 producer;
int frag_count, no_of_desc;
@ -1851,6 +1853,21 @@ netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
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 > NETXEN_MAX_FRAGS_PER_TX) {
for (i = 0; i < (frag_count - NETXEN_MAX_FRAGS_PER_TX); i++) {
frag = &skb_shinfo(skb)->frags[i];
delta += frag->size;
}
if (!__pskb_pull_tail(skb, delta))
goto drop_packet;
frag_count = 1 + skb_shinfo(skb)->nr_frags;
}
/* 4 fragments per cmd des */
no_of_desc = (frag_count + 3) >> 2;