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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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RDMA/bnxt_re: Fix system crash during RDMA resource initialization
bnxt_re_ib_reg acquires and releases the rtnl lock whenever it accesses the L2 driver. The following sequence can trigger a crash Acquires the rtnl_lock -> Registers roce driver callback with L2 driver -> release the rtnl lock bnxt_re acquires the rtnl_lock -> Request for MSIx vectors -> release the rtnl_lock Issue happens when bnxt_re proceeds with remaining part of initialization and L2 driver invokes bnxt_ulp_irq_stop as a part of bnxt_open_nic. The crash is in bnxt_qplib_nq_stop_irq as the NQ structures are not initialized yet, <snip> [ 3551.726647] BUG: unable to handle kernel NULL pointer dereference at (null) [ 3551.726656] IP: [<ffffffffc0840ee9>] bnxt_qplib_nq_stop_irq+0x59/0xb0 [bnxt_re] [ 3551.726674] PGD 0 [ 3551.726679] Oops: 0002 1 SMP ... [ 3551.726822] Hardware name: Dell Inc. PowerEdge R720/08RW36, BIOS 2.4.3 07/09/2014 [ 3551.726826] task: ffff97e30eec5ee0 ti: ffff97e3173bc000 task.ti: ffff97e3173bc000 [ 3551.726829] RIP: 0010:[<ffffffffc0840ee9>] [<ffffffffc0840ee9>] bnxt_qplib_nq_stop_irq+0x59/0xb0 [bnxt_re] ... [ 3551.726872] Call Trace: [ 3551.726886] [<ffffffffc082cb9e>] bnxt_re_stop_irq+0x4e/0x70 [bnxt_re] [ 3551.726899] [<ffffffffc07d6a53>] bnxt_ulp_irq_stop+0x43/0x70 [bnxt_en] [ 3551.726908] [<ffffffffc07c82f4>] bnxt_reserve_rings+0x174/0x1e0 [bnxt_en] [ 3551.726917] [<ffffffffc07cafd8>] __bnxt_open_nic+0x368/0x9a0 [bnxt_en] [ 3551.726925] [<ffffffffc07cb62b>] bnxt_open_nic+0x1b/0x50 [bnxt_en] [ 3551.726934] [<ffffffffc07cc62f>] bnxt_setup_mq_tc+0x11f/0x260 [bnxt_en] [ 3551.726943] [<ffffffffc07d5f58>] bnxt_dcbnl_ieee_setets+0xb8/0x1f0 [bnxt_en] [ 3551.726954] [<ffffffff890f983a>] dcbnl_ieee_set+0x9a/0x250 [ 3551.726966] [<ffffffff88fd6d21>] ? __alloc_skb+0xa1/0x2d0 [ 3551.726972] [<ffffffff890f72fa>] dcb_doit+0x13a/0x210 [ 3551.726981] [<ffffffff89003ff7>] rtnetlink_rcv_msg+0xa7/0x260 [ 3551.726989] [<ffffffff88ffdb00>] ? rtnl_unicast+0x20/0x30 [ 3551.726996] [<ffffffff88bf9dc8>] ? __kmalloc_node_track_caller+0x58/0x290 [ 3551.727002] [<ffffffff890f7326>] ? dcb_doit+0x166/0x210 [ 3551.727007] [<ffffffff88fd6d0d>] ? __alloc_skb+0x8d/0x2d0 [ 3551.727012] [<ffffffff89003f50>] ? rtnl_newlink+0x880/0x880 ... [ 3551.727104] [<ffffffff8911f7d5>] system_call_fastpath+0x1c/0x21 ... [ 3551.727164] RIP [<ffffffffc0840ee9>] bnxt_qplib_nq_stop_irq+0x59/0xb0 [bnxt_re] [ 3551.727175] RSP <ffff97e3173bf788> [ 3551.727177] CR2: 0000000000000000 Avoid this inconsistent state and system crash by acquiring the rtnl lock for the entire duration of device initialization. Re-factor the code to remove the rtnl lock from the individual function and acquire and release it from the caller. Fixes:1ac5a40479("RDMA/bnxt_re: Add bnxt_re RoCE driver") Fixes:6e04b10356("RDMA/bnxt_re: Fix broken RoCE driver due to recent L2 driver changes") Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Selvin Xavier
Jason Gunthorpe
parent
b4a4957d3d
commit
de5c95d0f5
@ -78,7 +78,7 @@ static struct list_head bnxt_re_dev_list = LIST_HEAD_INIT(bnxt_re_dev_list);
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/* Mutex to protect the list of bnxt_re devices added */
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static DEFINE_MUTEX(bnxt_re_dev_lock);
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static struct workqueue_struct *bnxt_re_wq;
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static void bnxt_re_ib_unreg(struct bnxt_re_dev *rdev, bool lock_wait);
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static void bnxt_re_ib_unreg(struct bnxt_re_dev *rdev);
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/* SR-IOV helper functions */
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@ -182,7 +182,7 @@ static void bnxt_re_shutdown(void *p)
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if (!rdev)
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return;
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bnxt_re_ib_unreg(rdev, false);
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bnxt_re_ib_unreg(rdev);
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}
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static void bnxt_re_stop_irq(void *handle)
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@ -251,7 +251,7 @@ static struct bnxt_ulp_ops bnxt_re_ulp_ops = {
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/* Driver registration routines used to let the networking driver (bnxt_en)
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* to know that the RoCE driver is now installed
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*/
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static int bnxt_re_unregister_netdev(struct bnxt_re_dev *rdev, bool lock_wait)
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static int bnxt_re_unregister_netdev(struct bnxt_re_dev *rdev)
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{
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struct bnxt_en_dev *en_dev;
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int rc;
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@ -260,14 +260,9 @@ static int bnxt_re_unregister_netdev(struct bnxt_re_dev *rdev, bool lock_wait)
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return -EINVAL;
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en_dev = rdev->en_dev;
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/* Acquire rtnl lock if it is not invokded from netdev event */
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if (lock_wait)
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rtnl_lock();
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rc = en_dev->en_ops->bnxt_unregister_device(rdev->en_dev,
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BNXT_ROCE_ULP);
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if (lock_wait)
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rtnl_unlock();
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return rc;
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}
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@ -281,14 +276,12 @@ static int bnxt_re_register_netdev(struct bnxt_re_dev *rdev)
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en_dev = rdev->en_dev;
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rtnl_lock();
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rc = en_dev->en_ops->bnxt_register_device(en_dev, BNXT_ROCE_ULP,
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&bnxt_re_ulp_ops, rdev);
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rtnl_unlock();
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return rc;
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}
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static int bnxt_re_free_msix(struct bnxt_re_dev *rdev, bool lock_wait)
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static int bnxt_re_free_msix(struct bnxt_re_dev *rdev)
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{
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struct bnxt_en_dev *en_dev;
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int rc;
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@ -298,13 +291,9 @@ static int bnxt_re_free_msix(struct bnxt_re_dev *rdev, bool lock_wait)
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en_dev = rdev->en_dev;
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if (lock_wait)
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rtnl_lock();
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rc = en_dev->en_ops->bnxt_free_msix(rdev->en_dev, BNXT_ROCE_ULP);
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if (lock_wait)
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rtnl_unlock();
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return rc;
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}
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@ -320,7 +309,6 @@ static int bnxt_re_request_msix(struct bnxt_re_dev *rdev)
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num_msix_want = min_t(u32, BNXT_RE_MAX_MSIX, num_online_cpus());
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rtnl_lock();
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num_msix_got = en_dev->en_ops->bnxt_request_msix(en_dev, BNXT_ROCE_ULP,
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rdev->msix_entries,
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num_msix_want);
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@ -335,7 +323,6 @@ static int bnxt_re_request_msix(struct bnxt_re_dev *rdev)
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}
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rdev->num_msix = num_msix_got;
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done:
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rtnl_unlock();
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return rc;
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}
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@ -358,24 +345,18 @@ static void bnxt_re_fill_fw_msg(struct bnxt_fw_msg *fw_msg, void *msg,
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fw_msg->timeout = timeout;
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}
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static int bnxt_re_net_ring_free(struct bnxt_re_dev *rdev, u16 fw_ring_id,
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bool lock_wait)
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static int bnxt_re_net_ring_free(struct bnxt_re_dev *rdev, u16 fw_ring_id)
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{
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struct bnxt_en_dev *en_dev = rdev->en_dev;
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struct hwrm_ring_free_input req = {0};
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struct hwrm_ring_free_output resp;
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struct bnxt_fw_msg fw_msg;
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bool do_unlock = false;
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int rc = -EINVAL;
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if (!en_dev)
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return rc;
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memset(&fw_msg, 0, sizeof(fw_msg));
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if (lock_wait) {
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rtnl_lock();
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do_unlock = true;
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}
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bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_RING_FREE, -1, -1);
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req.ring_type = RING_ALLOC_REQ_RING_TYPE_L2_CMPL;
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@ -386,8 +367,6 @@ static int bnxt_re_net_ring_free(struct bnxt_re_dev *rdev, u16 fw_ring_id,
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if (rc)
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dev_err(rdev_to_dev(rdev),
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"Failed to free HW ring:%d :%#x", req.ring_id, rc);
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if (do_unlock)
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rtnl_unlock();
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return rc;
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}
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@ -405,7 +384,6 @@ static int bnxt_re_net_ring_alloc(struct bnxt_re_dev *rdev, dma_addr_t *dma_arr,
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return rc;
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memset(&fw_msg, 0, sizeof(fw_msg));
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rtnl_lock();
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bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_RING_ALLOC, -1, -1);
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req.enables = 0;
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req.page_tbl_addr = cpu_to_le64(dma_arr[0]);
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@ -426,27 +404,21 @@ static int bnxt_re_net_ring_alloc(struct bnxt_re_dev *rdev, dma_addr_t *dma_arr,
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if (!rc)
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*fw_ring_id = le16_to_cpu(resp.ring_id);
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rtnl_unlock();
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return rc;
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}
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static int bnxt_re_net_stats_ctx_free(struct bnxt_re_dev *rdev,
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u32 fw_stats_ctx_id, bool lock_wait)
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u32 fw_stats_ctx_id)
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{
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struct bnxt_en_dev *en_dev = rdev->en_dev;
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struct hwrm_stat_ctx_free_input req = {0};
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struct bnxt_fw_msg fw_msg;
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bool do_unlock = false;
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int rc = -EINVAL;
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if (!en_dev)
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return rc;
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memset(&fw_msg, 0, sizeof(fw_msg));
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if (lock_wait) {
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rtnl_lock();
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do_unlock = true;
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}
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bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_STAT_CTX_FREE, -1, -1);
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req.stat_ctx_id = cpu_to_le32(fw_stats_ctx_id);
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@ -457,8 +429,6 @@ static int bnxt_re_net_stats_ctx_free(struct bnxt_re_dev *rdev,
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dev_err(rdev_to_dev(rdev),
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"Failed to free HW stats context %#x", rc);
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if (do_unlock)
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rtnl_unlock();
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return rc;
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}
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@ -478,7 +448,6 @@ static int bnxt_re_net_stats_ctx_alloc(struct bnxt_re_dev *rdev,
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return rc;
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memset(&fw_msg, 0, sizeof(fw_msg));
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rtnl_lock();
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bnxt_re_init_hwrm_hdr(rdev, (void *)&req, HWRM_STAT_CTX_ALLOC, -1, -1);
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req.update_period_ms = cpu_to_le32(1000);
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@ -490,7 +459,6 @@ static int bnxt_re_net_stats_ctx_alloc(struct bnxt_re_dev *rdev,
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if (!rc)
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*fw_stats_ctx_id = le32_to_cpu(resp.stat_ctx_id);
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rtnl_unlock();
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return rc;
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}
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@ -929,19 +897,19 @@ static int bnxt_re_init_res(struct bnxt_re_dev *rdev)
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return rc;
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}
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static void bnxt_re_free_nq_res(struct bnxt_re_dev *rdev, bool lock_wait)
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static void bnxt_re_free_nq_res(struct bnxt_re_dev *rdev)
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{
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int i;
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for (i = 0; i < rdev->num_msix - 1; i++) {
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bnxt_re_net_ring_free(rdev, rdev->nq[i].ring_id, lock_wait);
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bnxt_re_net_ring_free(rdev, rdev->nq[i].ring_id);
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bnxt_qplib_free_nq(&rdev->nq[i]);
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}
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}
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static void bnxt_re_free_res(struct bnxt_re_dev *rdev, bool lock_wait)
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static void bnxt_re_free_res(struct bnxt_re_dev *rdev)
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{
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bnxt_re_free_nq_res(rdev, lock_wait);
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bnxt_re_free_nq_res(rdev);
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if (rdev->qplib_res.dpi_tbl.max) {
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bnxt_qplib_dealloc_dpi(&rdev->qplib_res,
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@ -1219,7 +1187,7 @@ static int bnxt_re_setup_qos(struct bnxt_re_dev *rdev)
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return 0;
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}
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static void bnxt_re_ib_unreg(struct bnxt_re_dev *rdev, bool lock_wait)
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static void bnxt_re_ib_unreg(struct bnxt_re_dev *rdev)
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{
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int i, rc;
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@ -1234,28 +1202,27 @@ static void bnxt_re_ib_unreg(struct bnxt_re_dev *rdev, bool lock_wait)
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cancel_delayed_work(&rdev->worker);
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bnxt_re_cleanup_res(rdev);
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bnxt_re_free_res(rdev, lock_wait);
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bnxt_re_free_res(rdev);
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if (test_and_clear_bit(BNXT_RE_FLAG_RCFW_CHANNEL_EN, &rdev->flags)) {
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rc = bnxt_qplib_deinit_rcfw(&rdev->rcfw);
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if (rc)
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dev_warn(rdev_to_dev(rdev),
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"Failed to deinitialize RCFW: %#x", rc);
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bnxt_re_net_stats_ctx_free(rdev, rdev->qplib_ctx.stats.fw_id,
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lock_wait);
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bnxt_re_net_stats_ctx_free(rdev, rdev->qplib_ctx.stats.fw_id);
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bnxt_qplib_free_ctx(rdev->en_dev->pdev, &rdev->qplib_ctx);
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bnxt_qplib_disable_rcfw_channel(&rdev->rcfw);
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bnxt_re_net_ring_free(rdev, rdev->rcfw.creq_ring_id, lock_wait);
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bnxt_re_net_ring_free(rdev, rdev->rcfw.creq_ring_id);
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bnxt_qplib_free_rcfw_channel(&rdev->rcfw);
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}
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if (test_and_clear_bit(BNXT_RE_FLAG_GOT_MSIX, &rdev->flags)) {
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rc = bnxt_re_free_msix(rdev, lock_wait);
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rc = bnxt_re_free_msix(rdev);
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if (rc)
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dev_warn(rdev_to_dev(rdev),
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"Failed to free MSI-X vectors: %#x", rc);
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}
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if (test_and_clear_bit(BNXT_RE_FLAG_NETDEV_REGISTERED, &rdev->flags)) {
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rc = bnxt_re_unregister_netdev(rdev, lock_wait);
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rc = bnxt_re_unregister_netdev(rdev);
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if (rc)
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dev_warn(rdev_to_dev(rdev),
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"Failed to unregister with netdev: %#x", rc);
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@ -1276,6 +1243,12 @@ static int bnxt_re_ib_reg(struct bnxt_re_dev *rdev)
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{
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int i, j, rc;
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bool locked;
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/* Acquire rtnl lock through out this function */
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rtnl_lock();
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locked = true;
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/* Registered a new RoCE device instance to netdev */
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rc = bnxt_re_register_netdev(rdev);
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if (rc) {
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@ -1374,12 +1347,16 @@ static int bnxt_re_ib_reg(struct bnxt_re_dev *rdev)
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schedule_delayed_work(&rdev->worker, msecs_to_jiffies(30000));
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}
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rtnl_unlock();
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locked = false;
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/* Register ib dev */
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rc = bnxt_re_register_ib(rdev);
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if (rc) {
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pr_err("Failed to register with IB: %#x\n", rc);
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goto fail;
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}
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set_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags);
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dev_info(rdev_to_dev(rdev), "Device registered successfully");
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for (i = 0; i < ARRAY_SIZE(bnxt_re_attributes); i++) {
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rc = device_create_file(&rdev->ibdev.dev,
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@ -1395,7 +1372,6 @@ static int bnxt_re_ib_reg(struct bnxt_re_dev *rdev)
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goto fail;
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}
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}
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set_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags);
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ib_get_eth_speed(&rdev->ibdev, 1, &rdev->active_speed,
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&rdev->active_width);
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set_bit(BNXT_RE_FLAG_ISSUE_ROCE_STATS, &rdev->flags);
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@ -1404,17 +1380,21 @@ static int bnxt_re_ib_reg(struct bnxt_re_dev *rdev)
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return 0;
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free_sctx:
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bnxt_re_net_stats_ctx_free(rdev, rdev->qplib_ctx.stats.fw_id, true);
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bnxt_re_net_stats_ctx_free(rdev, rdev->qplib_ctx.stats.fw_id);
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free_ctx:
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bnxt_qplib_free_ctx(rdev->en_dev->pdev, &rdev->qplib_ctx);
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disable_rcfw:
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bnxt_qplib_disable_rcfw_channel(&rdev->rcfw);
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free_ring:
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bnxt_re_net_ring_free(rdev, rdev->rcfw.creq_ring_id, true);
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bnxt_re_net_ring_free(rdev, rdev->rcfw.creq_ring_id);
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free_rcfw:
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bnxt_qplib_free_rcfw_channel(&rdev->rcfw);
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fail:
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bnxt_re_ib_unreg(rdev, true);
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if (!locked)
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rtnl_lock();
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bnxt_re_ib_unreg(rdev);
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rtnl_unlock();
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return rc;
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}
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@ -1567,7 +1547,7 @@ static int bnxt_re_netdev_event(struct notifier_block *notifier,
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*/
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if (atomic_read(&rdev->sched_count) > 0)
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goto exit;
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bnxt_re_ib_unreg(rdev, false);
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bnxt_re_ib_unreg(rdev);
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bnxt_re_remove_one(rdev);
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bnxt_re_dev_unreg(rdev);
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break;
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@ -1646,7 +1626,10 @@ static void __exit bnxt_re_mod_exit(void)
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*/
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flush_workqueue(bnxt_re_wq);
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bnxt_re_dev_stop(rdev);
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bnxt_re_ib_unreg(rdev, true);
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||||
/* Acquire the rtnl_lock as the L2 resources are freed here */
|
||||
rtnl_lock();
|
||||
bnxt_re_ib_unreg(rdev);
|
||||
rtnl_unlock();
|
||||
bnxt_re_remove_one(rdev);
|
||||
bnxt_re_dev_unreg(rdev);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user