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e1000e: fix panic while dumping packets on Tx hang with IOMMU 

This patch resolves a "BUG: unable to handle kernel paging request at ..."
oops while dumping packet data. The issue occurs with IOMMU enabled due to
the address provided by phys_to_virt().

This patch avoids phys_to_virt() by using skb->data and the address of the
pages allocated for Rx.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
This commit is contained in:
Emil Tantilov 2012-08-01 08:12:21 +00:00 committed by Peter P Waskiewicz Jr
parent b669588aba
commit f0c5dadff3
1 changed files with 26 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/net/ethernet/intel/e1000e/netdev.c
View File

@ -178,6 +178,24 @@ static void e1000_regdump(struct e1000_hw *hw, struct e1000_reg_info *reginfo)
pr_info("%-15s %08x %08x\n", rname, regs[0], regs[1]);
}
static void e1000e_dump_ps_pages(struct e1000_adapter *adapter,
struct e1000_buffer *bi)
{
int i;
struct e1000_ps_page *ps_page;
for (i = 0; i < adapter->rx_ps_pages; i++) {
ps_page = &bi->ps_pages[i];
if (ps_page->page) {
pr_info("packet dump for ps_page %d:\n", i);
print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,
16, 1, page_address(ps_page->page),
PAGE_SIZE, true);
}
}
}
/*
* e1000e_dump - Print registers, Tx-ring and Rx-ring
*/
@ -299,10 +317,10 @@ static void e1000e_dump(struct e1000_adapter *adapter)
(unsigned long long)buffer_info->time_stamp,
buffer_info->skb, next_desc);
if (netif_msg_pktdata(adapter) && buffer_info->dma != 0)
if (netif_msg_pktdata(adapter) && buffer_info->skb)
print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS,
16, 1, phys_to_virt(buffer_info->dma),
buffer_info->length, true);
16, 1, buffer_info->skb->data,
buffer_info->skb->len, true);
}
/* Print Rx Ring Summary */
@ -381,10 +399,8 @@ rx_ring_summary:
buffer_info->skb, next_desc);
if (netif_msg_pktdata(adapter))
print_hex_dump(KERN_INFO, "",
DUMP_PREFIX_ADDRESS, 16, 1,
phys_to_virt(buffer_info->dma),
adapter->rx_ps_bsize0, true);
e1000e_dump_ps_pages(adapter,
buffer_info);
}
}
break;
@ -444,12 +460,12 @@ rx_ring_summary:
(unsigned long long)buffer_info->dma,
buffer_info->skb, next_desc);
if (netif_msg_pktdata(adapter))
if (netif_msg_pktdata(adapter) &&
buffer_info->skb)
print_hex_dump(KERN_INFO, "",
DUMP_PREFIX_ADDRESS, 16,
1,
phys_to_virt
(buffer_info->dma),
buffer_info->skb->data,
adapter->rx_buffer_len,
true);
}