idpf: Fix RSS LUT NULL pointer crash on early ethtool operations

idpf: Fix RSS LUT NULL pointer crash on early ethtool operations

[ Upstream commit 83f38f210b85676f40ba8586b5a8edae19b56995 ]

The RSS LUT is not initialized until the interface comes up, causing
the following NULL pointer crash when ethtool operations like rxhash on/off
are performed before the interface is brought up for the first time.

Move RSS LUT initialization from ndo_open to vport creation to ensure LUT
is always available. This enables RSS configuration via ethtool before
bringing the interface up. Simplify LUT management by maintaining all
changes in the driver's soft copy and programming zeros to the indirection
table when rxhash is disabled. Defer HW programming until the interface
comes up if it is down during rxhash and LUT configuration changes.

Steps to reproduce:
** Load idpf driver; interfaces will be created
	modprobe idpf
** Before bringing the interfaces up, turn rxhash off
	ethtool -K eth2 rxhash off

[89408.371875] BUG: kernel NULL pointer dereference, address: 0000000000000000
[89408.371908] #PF: supervisor read access in kernel mode
[89408.371924] #PF: error_code(0x0000) - not-present page
[89408.371940] PGD 0 P4D 0
[89408.371953] Oops: Oops: 0000 [#1] SMP NOPTI
<snip>
[89408.372052] RIP: 0010:memcpy_orig+0x16/0x130
[89408.372310] Call Trace:
[89408.372317]  <TASK>
[89408.372326]  ? idpf_set_features+0xfc/0x180 [idpf]
[89408.372363]  __netdev_update_features+0x295/0xde0
[89408.372384]  ethnl_set_features+0x15e/0x460
[89408.372406]  genl_family_rcv_msg_doit+0x11f/0x180
[89408.372429]  genl_rcv_msg+0x1ad/0x2b0
[89408.372446]  ? __pfx_ethnl_set_features+0x10/0x10
[89408.372465]  ? __pfx_genl_rcv_msg+0x10/0x10
[89408.372482]  netlink_rcv_skb+0x58/0x100
[89408.372502]  genl_rcv+0x2c/0x50
[89408.372516]  netlink_unicast+0x289/0x3e0
[89408.372533]  netlink_sendmsg+0x215/0x440
[89408.372551]  __sys_sendto+0x234/0x240
[89408.372571]  __x64_sys_sendto+0x28/0x30
[89408.372585]  x64_sys_call+0x1909/0x1da0
[89408.372604]  do_syscall_64+0x7a/0xfa0
[89408.373140]  ? clear_bhb_loop+0x60/0xb0
[89408.373647]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[89408.378887]  </TASK>
<snip>

Fixes: a251eee62133 ("idpf: add SRIOV support and other ndo_ops")
Signed-off-by: Sreedevi Joshi <sreedevi.joshi@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Emil Tantilov <emil.s.tantilov@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>