e1000: save skb counts in TX to avoid cache misses

Virtual Machines with emulated e1000 network adapter running on Parallels'
server were seeing kernel panics due to the e1000 driver dereferencing an
unexpected NULL pointer retrieved from buffer_info->skb.

The problem has been addressed for the e1000e driver, but not for the e1000.
Since the two drivers share similar code in the affected area, a port of the
following e1000e driver commit solves the issue for the e1000 driver:

commit 9ed318d546a29d7a591dbe648fd1a2efe3be1180
Author: Tom Herbert <therbert@google.com>
Date:   Wed May 5 14:02:27 2010 +0000

    e1000e: save skb counts in TX to avoid cache misses

    In e1000_tx_map, precompute number of segements and bytecounts which
    are derived from fields in skb; these are stored in buffer_info.  When
    cleaning tx in e1000_clean_tx_irq use the values in the associated
    buffer_info for statistics counting, this eliminates cache misses
    on skb fields.

(cherry picked from commit 31c15a2f24ebdab14333d9bf5df49757842ae2ec)
Signed-off-by: Dean Nelson <dnelson@redhat.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Joe Jin <joe.jin@oracle.com>

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index cf9e797b64a0e8e82f584bd15bfc98264c26dc89..1e1596990b5c5d15af756b58266365789cf1d901 100644 (file)
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -150,6 +150,8 @@ struct e1000_buffer {
        unsigned long time_stamp;
        u16 length;
        u16 next_to_watch;
+       unsigned int segs;
+       unsigned int bytecount;
        u16 mapped_as_page;
 };
 

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 5ac1846eaa4f7c2e7a6b957a5803f544b82cdf91..1823c4ae10046a6a25bd069c2528da83bc4c2de4 100644 (file)
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2830,7 +2830,7 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
        struct e1000_buffer *buffer_info;
        unsigned int len = skb_headlen(skb);
        unsigned int offset = 0, size, count = 0, i;
-       unsigned int f;
+       unsigned int f, bytecount, segs;
 
        i = tx_ring->next_to_use;
 
@@ -2931,7 +2931,13 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
                }
        }
 
+       segs = skb_shinfo(skb)->gso_segs ?: 1;
+       /* multiply data chunks by size of headers */
+       bytecount = ((segs - 1) * skb_headlen(skb)) + skb->len;
+
        tx_ring->buffer_info[i].skb = skb;
+       tx_ring->buffer_info[i].segs = segs;
+       tx_ring->buffer_info[i].bytecount = bytecount;
        tx_ring->buffer_info[first].next_to_watch = i;
 
        return count;
@@ -3605,14 +3611,8 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
                        cleaned = (i == eop);
 
                        if (cleaned) {
-                               struct sk_buff *skb = buffer_info->skb;
-                               unsigned int segs, bytecount;
-                               segs = skb_shinfo(skb)->gso_segs ?: 1;
-                               /* multiply data chunks by size of headers */
-                               bytecount = ((segs - 1) * skb_headlen(skb)) +
-                                           skb->len;
-                               total_tx_packets += segs;
-                               total_tx_bytes += bytecount;
+                               total_tx_packets += buffer_info->segs;
+                               total_tx_bytes += buffer_info->bytecount;
                        }
                        e1000_unmap_and_free_tx_resource(adapter, buffer_info);
                        tx_desc->upper.data = 0;