Vitaly Kuznetsov 14a03cf80e hv_netvsc: Restore needed_headroom request ... Commit c0eb454034 ("hv_netvsc: Don't ask for additional head room in the skb") got rid of needed_headroom setting for the driver. With the change I hit the following issue trying to use ptkgen module: [ 57.522021] kernel BUG at net/core/skbuff.c:1128! [ 57.522021] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC ... [ 58.721068] Call Trace: [ 58.721068] [<ffffffffa0144e86>] netvsc_start_xmit+0x4c6/0x8e0 [hv_netvsc] ... [ 58.721068] [<ffffffffa02f87fc>] ? pktgen_finalize_skb+0x25c/0x2a0 [pktgen] [ 58.721068] [<ffffffff814f5760>] ? __netdev_alloc_skb+0xc0/0x100 [ 58.721068] [<ffffffffa02f9907>] pktgen_thread_worker+0x257/0x1920 [pktgen] Basically, we're calling skb_cow_head(skb, RNDIS_AND_PPI_SIZE) and crash on if (skb_shared(skb)) BUG(); We probably need to restore needed_headroom setting (but shrunk to RNDIS_AND_PPI_SIZE as we don't need more) to request the required headroom space. In theory, it should not give us performance penalty. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-02-13 06:04:44 -05:00
..
hyperv_net.h	hv_netvsc: Fix book keeping of skb during batching process	2016-01-25 10:51:53 -08:00
Kconfig	staging: hv: move hv_netvsc out of staging area	2011-11-29 16:12:36 +09:00
Makefile	staging: hv: move hv_netvsc out of staging area	2011-11-29 16:12:36 +09:00
netvsc_drv.c	hv_netvsc: Restore needed_headroom request	2016-02-13 06:04:44 -05:00
netvsc.c	hv_netvsc: Fix book keeping of skb during batching process	2016-01-25 10:51:53 -08:00
rndis_filter.c	hv_netvsc: Eliminate vlan_tci from struct hv_netvsc_packet	2015-12-02 23:43:25 -05:00