[PATCH 4.8 048/125] i40e: fix broken i40e_config_rss_aq function

From: Greg Kroah-Hartman
Date: Sat Oct 29 2016 - 10:09:44 EST

4.8-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jacob Keller <jacob.e.keller@xxxxxxxxx>

commit 776b2e15f8af7900409456292efd45af6de97172 upstream.

X722 hardware requires using the admin queue to configure RSS. This
function was previously re-written in commit e69ff813af35 ("i40e: rework
the functions to configure RSS with similar parameters").
However, the previous refactor did not work correctly for a few reasons

(a) it does not check whether seed is NULL before using it, resulting in
a NULL pointer dereference

[ 402.954721] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 402.955568] IP: [<ffffffffa0090ccf>] i40e_config_rss_aq.constprop.65+0x2f/0x1c0 [i40e]
[ 402.956402] PGD ad610067 PUD accc0067 PMD 0
[ 402.957235] Oops: 0000 [#1] SMP
[ 402.958064] Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_filter ebtable_
broute bridge stp llc ebtable_nat ebtables ip6table_mangle ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv
6 ip6table_security ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_nat nf_conntrack_ipv4_ nf_defrag_ipv4_ nf_nat_ip
v4_ nf_nat nf_conntrack iptable_security intel_rapl i86_kg_temp_thermal coretemp kvm_intel kvm irqbypass crct10dif_clMl crc32_
pclMl ghash_clMlni_intel iTCO_wdt iTCO_vendor_support shpchp sb_edac dcdbas pcspkr joydev ipmi_devintf wmi edac_core ipmi_ssif
acpi_ad acpi_ower_meter ipmi_si ipmi_msghandler mei_me nfsd lpc_ich mei ioatdma tpm_tis auth_rpcgss tpm nfs_acl lockd grace s
unrpc ifs nngag200 i2c_algo_bit drm_kms_helper ttm drm iigbe bnx2x i40e dca mdio ptp pps_core libcrc32c fjes crc32c_intel
[ 402.965563] CPU: 22 PID: 2461 Conm: ethtool Not tainted 4.6.0-rc7_1.2-ABNidQ+ #20
[ 402.966719] Hardware name: Dell Inc. PowerEdge R720/0C4Y3R, BIOS 2.5.2 01/28/2015
[ 402.967862] task: ffff880219b51dc0 ti: ffff8800b3408000 task.ti: ffff8800b3408000
[ 402.969046] RIP: 0010:[<ffffffffa0090ccf>] [<ffffffffa0090ccf>] i40e_config_rss_aq.constprop.65+0x2f/0x1c0 [i40e]
[ 402.970339] RSP: 0018:ffff8800b340ba90 EFLAGS: 00010246
[ 402.971616] RAX: 0000000000000000 RBX: ffff88042ec14000 RCX: 0000000000000200
[ 402.972961] RDX: ffff880428eb9200 RSI: 0000000000000000 RDI: ffff88042ec14000
[ 402.974312] RBP: ffff8800b340baf8 R08: ffff880237ada8f0 R09: ffff880428eb9200
[ 402.975709] R10: ffff880428eb9200 R11: 0000000000000000 R12: ffff88042ec2e000
[ 402.977104] R13: ffff88042ec2e000 R14: ffff88042ec14000 R15: ffff88022ea00800
[ 402.978541] FS: 00007f84fd054700(0000) GS:ffff880237ac0000(0000) knlGS:0000000000000000
[ 402.980003] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 402.981508] CR2: 0000000000000000 CR3: 000000003289e000 CR4: 00000000000406e0
[ 402.983028] Stack:
[ 402.984578] 0000000002000200 0000000000000000 ffff88023ffeda68 ffff88023ffef000
[ 402.986187] 0000000000000268 ffff8800b340bbf8 ffff88023ffedd80 0000000088ce4f1d
[ 402.987844] ffff88042ec14000 ffff88022ea00800 ffff88042ec2e000 ffff88042ec14000
[ 402.989509] Call Trace:
[ 402.991200] [<ffffffffa009636f>] i40e_config_rss+0x11f/0x1c0 [i40e]
[ 402.992924] [<ffffffffa00a1ae0>] i40e_set_rifh+0ic0/0x130 [i40e]
[ 402.994684] [<ffffffff816d54b7>] ethtool_set_rifh+0x1f7/0x300
[ 402.996446] [<ffffffff8136d02b>] ? cred_has_capability+0io6b/0x100
[ 402.998203] [<ffffffff8136d102>] ? selinux_capable+0x12/0x20
[ 402.999968] [<ffffffff8136277b>] ? security_capable+0x4b/0x70
[ 403.001707] [<ffffffff816d6da3>] dev_ethtool+0x1423/0x2290
[ 403.003461] [<ffffffff816eab41>] dev_ioctl+0x191/0io630
[ 403.005186] [<ffffffff811cf80a>] ? lru_cache_add+0x3a/0i80
[ 403.006942] [<ffffffff817f2a8e>] ? _raw_spin_unlock+0ie/0x20
[ 403.008691] [<ffffffff816adb95>] sock_do_ioctl+0x45/0i50
[ 403.010421] [<ffffffff816ae229>] sock_ioctl+0x209/0x2d0
[ 403.012173] [<ffffffff81262194>] do_vfs_ioctl+0u4/0io6c0
[ 403.013911] [<ffffffff81262829>] SyS_ioctl+0x79/0x90
[ 403.015710] [<ffffffff817f2e72>] entry_SYSCALL_64_fastpath+0x1a/0u4
[ 403.017500] Code: 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 ec 40 4c 8b a7 e0 05 00 00 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 <48> 8b 06 41 0f b7 bc 24 f2 0f 00 00 48 89 45 9c 48 8b 46 08 48
[ 403.021454] RIP [<ffffffffa0090ccf>] i40e_config_rss_aq.constprop.65+0x2f/0x1c0 [i40e]
[ 403.023395] RSP <ffff8800b340ba90>
[ 403.025271] CR2: 0000000000000000
[ 403.027169] ---[ end trace 64561b528cf61cf0 ]---

(b) it does not even bother to use the passed in *lut parameter which
defines the requested lookup table. Instead it uses its own round robin
table.

Fix these issues by re-writing it to be similar to i40e_config_rss_reg
and i40e_get_rss_aq.

Fixes: e69ff813af35 ("i40e: rework the functions to configure RSS with similar parameters", 2015-10-21)
Signed-off-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
Tested-by: Andrew Bowers <andrewx.bowers@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/net/ethernet/intel/i40e/i40e_main.c | 57 +++++++++++-----------------
1 file changed, 23 insertions(+), 34 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -7990,45 +7990,34 @@ static int i40e_setup_misc_vector(struct
static int i40e_config_rss_aq(struct i40e_vsi *vsi, const u8 *seed,
u8 *lut, u16 lut_size)
{
- struct i40e_aqc_get_set_rss_key_data rss_key;
struct i40e_pf *pf = vsi->back;
struct i40e_hw *hw = &pf->hw;
- bool pf_lut = false;
- u8 *rss_lut;
- int ret, i;
+ int ret = 0;

- memcpy(&rss_key, seed, sizeof(rss_key));
-
- rss_lut = kzalloc(pf->rss_table_size, GFP_KERNEL);
- if (!rss_lut)
- return -ENOMEM;
-
- /* Populate the LUT with max no. of queues in round robin fashion */
- for (i = 0; i < vsi->rss_table_size; i++)
- rss_lut[i] = i % vsi->rss_size;
-
- ret = i40e_aq_set_rss_key(hw, vsi->id, &rss_key);
- if (ret) {
- dev_info(&pf->pdev->dev,
- "Cannot set RSS key, err %s aq_err %s\n",
- i40e_stat_str(&pf->hw, ret),
- i40e_aq_str(&pf->hw, pf->hw.aq.asq_last_status));
- goto config_rss_aq_out;
+ if (seed) {
+ struct i40e_aqc_get_set_rss_key_data *seed_dw =
+ (struct i40e_aqc_get_set_rss_key_data *)seed;
+ ret = i40e_aq_set_rss_key(hw, vsi->id, seed_dw);
+ if (ret) {
+ dev_info(&pf->pdev->dev,
+ "Cannot set RSS key, err %s aq_err %s\n",
+ i40e_stat_str(hw, ret),
+ i40e_aq_str(hw, hw->aq.asq_last_status));
+ return ret;
+ }
}
+ if (lut) {
+ bool pf_lut = vsi->type == I40E_VSI_MAIN ? true : false;

- if (vsi->type == I40E_VSI_MAIN)
- pf_lut = true;
-
- ret = i40e_aq_set_rss_lut(hw, vsi->id, pf_lut, rss_lut,
- vsi->rss_table_size);
- if (ret)
- dev_info(&pf->pdev->dev,
- "Cannot set RSS lut, err %s aq_err %s\n",
- i40e_stat_str(&pf->hw, ret),
- i40e_aq_str(&pf->hw, pf->hw.aq.asq_last_status));
-
-config_rss_aq_out:
- kfree(rss_lut);
+ ret = i40e_aq_set_rss_lut(hw, vsi->id, pf_lut, lut, lut_size);
+ if (ret) {
+ dev_info(&pf->pdev->dev,
+ "Cannot set RSS lut, err %s aq_err %s\n",
+ i40e_stat_str(hw, ret),
+ i40e_aq_str(hw, hw->aq.asq_last_status));
+ return ret;
+ }
+ }
return ret;
}