* [PATCH v2] vdpa/ifc/base: wait for queue disable before saving q-state [not found] <20221025072302.1683505-1-abhishek.maheshwari@intel.com> @ 2022-11-02 3:22 ` Abhishek Maheshwari 2022-11-02 9:54 ` [PATCH v3] " Abhishek Maheshwari 0 siblings, 1 reply; 9+ messages in thread From: Abhishek Maheshwari @ 2022-11-02 3:22 UTC (permalink / raw) To: maxime.coquelin, xiao.w.wang Cc: dev, stable, chenbo.xia, purna.chandra.mandal, andy.pei, Abhishek Maheshwari Some ifc hardware require synchronization between disabling a queue and saving queue-state from LM registers. When queue is disabled from vDPA driver, ifc device stops executing new virtio-cmds and then updates LM registers with used/avail index. Before saving the queue-state, vDPA driver should wait until the queue is disabled from backend. Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") Cc: andy.pei@intel.com Cc: stable@dpdk.org Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> --- v2: * Fixing the styling issues * Addressing comment to avoid reading the register again after exhausting the tries --- drivers/vdpa/ifc/base/ifcvf.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c index f1e1474447..281366f2a0 100644 --- a/drivers/vdpa/ifc/base/ifcvf.c +++ b/drivers/vdpa/ifc/base/ifcvf.c @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) u32 i; struct ifcvf_pci_common_cfg *cfg; u32 ring_state; + int q_disable_try; cfg = hw->common_cfg; if (!cfg) { @@ -275,6 +276,21 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) continue; } + /* Some ifc hardware require synchronization between disabling a + * queue and saving queue-state from LM registers. When queue is + * disabled from vDPA driver, ifc device stops executing new + * virtio-cmds and then updates LM registers with used/avail + * index. Before saving the queue-state, vDPA driver waits until + * the queue is disabled from backend. + */ + q_disable_try = 10; + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) + msec_delay(10); + + if (q_disable_try > 0) + WARNINGOUT("Failed Q:%d disable, Saved state invalid\n", + i); + if (hw->device_type == IFCVF_BLK) ring_state = *(u32 *)(hw->lm_cfg + IFCVF_LM_RING_STATE_OFFSET + -- 2.31.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v3] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-02 3:22 ` [PATCH v2] vdpa/ifc/base: wait for queue disable before saving q-state Abhishek Maheshwari @ 2022-11-02 9:54 ` Abhishek Maheshwari 2022-11-02 14:56 ` Pei, Andy ` (2 more replies) 0 siblings, 3 replies; 9+ messages in thread From: Abhishek Maheshwari @ 2022-11-02 9:54 UTC (permalink / raw) To: maxime.coquelin, xiao.w.wang Cc: dev, stable, chenbo.xia, purna.chandra.mandal, andy.pei, Abhishek Maheshwari Some ifc hardware require synchronization between disabling a queue and saving queue-state from LM registers. When queue is disabled from vDPA driver, ifc device stops executing new virtio-cmds and then updates LM registers with used/avail index. Before saving the queue-state, vDPA driver should wait until the queue is disabled from backend. Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") Cc: andy.pei@intel.com Cc: stable@dpdk.org Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> --- v2: * Fixing the styling issues * Addressing comment to avoid reading the register again after exhausting the tries v3: * Fixing warning condition --- drivers/vdpa/ifc/base/ifcvf.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c index f1e1474447..06996fd5d7 100644 --- a/drivers/vdpa/ifc/base/ifcvf.c +++ b/drivers/vdpa/ifc/base/ifcvf.c @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) u32 i; struct ifcvf_pci_common_cfg *cfg; u32 ring_state; + int q_disable_try; cfg = hw->common_cfg; if (!cfg) { @@ -275,6 +276,21 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) continue; } + /* Some ifc hardware require synchronization between disabling a + * queue and saving queue-state from LM registers. When queue is + * disabled from vDPA driver, ifc device stops executing new + * virtio-cmds and then updates LM registers with used/avail + * index. Before saving the queue-state, vDPA driver waits until + * the queue is disabled from backend. + */ + q_disable_try = 10; + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) + msec_delay(10); + + if (!q_disable_try) + WARNINGOUT("Failed Q:%d disable, Saved state invalid\n", + i); + if (hw->device_type == IFCVF_BLK) ring_state = *(u32 *)(hw->lm_cfg + IFCVF_LM_RING_STATE_OFFSET + -- 2.31.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH v3] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-02 9:54 ` [PATCH v3] " Abhishek Maheshwari @ 2022-11-02 14:56 ` Pei, Andy 2022-11-03 2:37 ` Xia, Chenbo 2022-11-03 4:36 ` [PATCH v4] " Abhishek Maheshwari 2 siblings, 0 replies; 9+ messages in thread From: Pei, Andy @ 2022-11-02 14:56 UTC (permalink / raw) To: Maheshwari, Abhishek, maxime.coquelin, Wang, Xiao W Cc: dev, stable, Xia, Chenbo, Mandal, Purna Chandra > -----Original Message----- > From: Maheshwari, Abhishek <abhishek.maheshwari@intel.com> > Sent: Wednesday, November 2, 2022 5:55 PM > To: maxime.coquelin@redhat.com; Wang, Xiao W <xiao.w.wang@intel.com> > Cc: dev@dpdk.org; stable@dpdk.org; Xia, Chenbo <Chenbo.Xia@intel.com>; > Mandal, Purna Chandra <Purna.Chandra.Mandal@intel.com>; Pei, Andy > <andy.pei@intel.com>; Maheshwari, Abhishek > <Abhishek.Maheshwari@intel.com> > Subject: [PATCH v3] vdpa/ifc/base: wait for queue disable before saving q- > state > > Some ifc hardware require synchronization between disabling a queue and > saving queue-state from LM registers. When queue is disabled from vDPA > driver, ifc device stops executing new virtio-cmds and then updates LM > registers with used/avail index. Before saving the queue-state, vDPA driver > should wait until the queue is disabled from backend. > > Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") > Cc: andy.pei@intel.com > Cc: stable@dpdk.org > > Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> > > --- > v2: > * Fixing the styling issues > * Addressing comment to avoid reading the register again after > exhausting the tries > > v3: > * Fixing warning condition > --- > drivers/vdpa/ifc/base/ifcvf.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c index > f1e1474447..06996fd5d7 100644 > --- a/drivers/vdpa/ifc/base/ifcvf.c > +++ b/drivers/vdpa/ifc/base/ifcvf.c > @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > u32 i; > struct ifcvf_pci_common_cfg *cfg; > u32 ring_state; > + int q_disable_try; > > cfg = hw->common_cfg; > if (!cfg) { > @@ -275,6 +276,21 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > continue; > } > > + /* Some ifc hardware require synchronization between > disabling a > + * queue and saving queue-state from LM registers. When > queue is > + * disabled from vDPA driver, ifc device stops executing new > + * virtio-cmds and then updates LM registers with used/avail > + * index. Before saving the queue-state, vDPA driver waits > until > + * the queue is disabled from backend. > + */ > + q_disable_try = 10; > + while (q_disable_try-- && IFCVF_READ_REG16(&cfg- > >queue_enable)) > + msec_delay(10); > + > + if (!q_disable_try) > + WARNINGOUT("Failed Q:%d disable, Saved state > invalid\n", > + i); > + > if (hw->device_type == IFCVF_BLK) > ring_state = *(u32 *)(hw->lm_cfg + > IFCVF_LM_RING_STATE_OFFSET + > -- > 2.31.1 Acked-by: Andy Pei <andy.pei@intel.com> ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH v3] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-02 9:54 ` [PATCH v3] " Abhishek Maheshwari 2022-11-02 14:56 ` Pei, Andy @ 2022-11-03 2:37 ` Xia, Chenbo 2022-11-03 4:36 ` [PATCH v4] " Abhishek Maheshwari 2 siblings, 0 replies; 9+ messages in thread From: Xia, Chenbo @ 2022-11-03 2:37 UTC (permalink / raw) To: Maheshwari, Abhishek, maxime.coquelin, Wang, Xiao W Cc: dev, stable, Mandal, Purna Chandra, Pei, Andy > -----Original Message----- > From: Maheshwari, Abhishek <abhishek.maheshwari@intel.com> > Sent: Wednesday, November 2, 2022 5:55 PM > To: maxime.coquelin@redhat.com; Wang, Xiao W <xiao.w.wang@intel.com> > Cc: dev@dpdk.org; stable@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; > Mandal, Purna Chandra <purna.chandra.mandal@intel.com>; Pei, Andy > <andy.pei@intel.com>; Maheshwari, Abhishek <abhishek.maheshwari@intel.com> > Subject: [PATCH v3] vdpa/ifc/base: wait for queue disable before saving q- > state > > Some ifc hardware require synchronization between disabling a queue and > saving queue-state from LM registers. When queue is disabled from vDPA > driver, ifc device stops executing new virtio-cmds and then updates LM > registers with used/avail index. Before saving the queue-state, vDPA > driver should wait until the queue is disabled from backend. > > Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") > Cc: andy.pei@intel.com No need to add above next time > Cc: stable@dpdk.org > > Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> > > --- > v2: > * Fixing the styling issues > * Addressing comment to avoid reading the register again after > exhausting the tries > > v3: > * Fixing warning condition > --- > drivers/vdpa/ifc/base/ifcvf.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c > index f1e1474447..06996fd5d7 100644 > --- a/drivers/vdpa/ifc/base/ifcvf.c > +++ b/drivers/vdpa/ifc/base/ifcvf.c > @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > u32 i; > struct ifcvf_pci_common_cfg *cfg; > u32 ring_state; > + int q_disable_try; > > cfg = hw->common_cfg; > if (!cfg) { > @@ -275,6 +276,21 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > continue; > } > > + /* Some ifc hardware require synchronization between disabling > a > + * queue and saving queue-state from LM registers. When queue > is > + * disabled from vDPA driver, ifc device stops executing new > + * virtio-cmds and then updates LM registers with used/avail > + * index. Before saving the queue-state, vDPA driver waits > until > + * the queue is disabled from backend. > + */ > + q_disable_try = 10; > + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) > + msec_delay(10); > + > + if (!q_disable_try) > + WARNINGOUT("Failed Q:%d disable, Saved state invalid\n", > + i); No need to start a new line here. Thanks, Chenbo > + > if (hw->device_type == IFCVF_BLK) > ring_state = *(u32 *)(hw->lm_cfg + > IFCVF_LM_RING_STATE_OFFSET + > -- > 2.31.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v4] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-02 9:54 ` [PATCH v3] " Abhishek Maheshwari 2022-11-02 14:56 ` Pei, Andy 2022-11-03 2:37 ` Xia, Chenbo @ 2022-11-03 4:36 ` Abhishek Maheshwari 2022-11-03 9:35 ` [PATCH v5] " Abhishek Maheshwari 2 siblings, 1 reply; 9+ messages in thread From: Abhishek Maheshwari @ 2022-11-03 4:36 UTC (permalink / raw) To: maxime.coquelin, xiao.w.wang Cc: dev, stable, chenbo.xia, purna.chandra.mandal, andy.pei, Abhishek Maheshwari Some ifc hardware require synchronization between disabling a queue and saving queue-state from LM registers. When queue is disabled from vDPA driver, ifc device stops executing new virtio-cmds and then updates LM registers with used/avail index. Before saving the queue-state, vDPA driver should wait until the queue is disabled from backend. Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") Cc: andy.pei@intel.com Cc: stable@dpdk.org Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> --- v2: * Fixing the styling issues * Addressing comment to avoid reading the register again after exhausting the tries v3: * Fixing warning condition v4: * Fixing print argument format to %u in warning --- drivers/vdpa/ifc/base/ifcvf.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c index f1e1474447..929eaafff2 100644 --- a/drivers/vdpa/ifc/base/ifcvf.c +++ b/drivers/vdpa/ifc/base/ifcvf.c @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) u32 i; struct ifcvf_pci_common_cfg *cfg; u32 ring_state; + int q_disable_try; cfg = hw->common_cfg; if (!cfg) { @@ -275,6 +276,21 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) continue; } + /* Some ifc hardware require synchronization between disabling a + * queue and saving queue-state from LM registers. When queue is + * disabled from vDPA driver, ifc device stops executing new + * virtio-cmds and then updates LM registers with used/avail + * index. Before saving the queue-state, vDPA driver waits until + * the queue is disabled from backend. + */ + q_disable_try = 10; + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) + msec_delay(10); + + if (!q_disable_try) + WARNINGOUT("Failed Q:%u disable, Saved state invalid\n", + i); + if (hw->device_type == IFCVF_BLK) ring_state = *(u32 *)(hw->lm_cfg + IFCVF_LM_RING_STATE_OFFSET + -- 2.31.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v5] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-03 4:36 ` [PATCH v4] " Abhishek Maheshwari @ 2022-11-03 9:35 ` Abhishek Maheshwari 2022-11-04 2:31 ` Xia, Chenbo ` (2 more replies) 0 siblings, 3 replies; 9+ messages in thread From: Abhishek Maheshwari @ 2022-11-03 9:35 UTC (permalink / raw) To: maxime.coquelin, xiao.w.wang Cc: dev, stable, chenbo.xia, purna.chandra.mandal, Abhishek Maheshwari Some ifc hardware require synchronization between disabling a queue and saving queue-state from LM registers. When queue is disabled from vDPA driver, ifc device stops executing new virtio-cmds and then updates LM registers with used/avail index. Before saving the queue-state, vDPA driver should wait until the queue is disabled from backend. Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") Cc: stable@dpdk.org Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> --- v2: * Fixing the styling issues * Addressing comment to avoid reading the register again after exhausting the tries v3: * Fixing warning condition v4: * Fixing print argument format to %u in warning v5: * Addressing comments based on input that line length limit is 100 --- drivers/vdpa/ifc/base/ifcvf.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c index f1e1474447..60555a6786 100644 --- a/drivers/vdpa/ifc/base/ifcvf.c +++ b/drivers/vdpa/ifc/base/ifcvf.c @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) u32 i; struct ifcvf_pci_common_cfg *cfg; u32 ring_state; + int q_disable_try; cfg = hw->common_cfg; if (!cfg) { @@ -275,6 +276,20 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) continue; } + /* Some ifc hardware require synchronization between disabling a + * queue and saving queue-state from LM registers. When queue is + * disabled from vDPA driver, ifc device stops executing new + * virtio-cmds and then updates LM registers with used/avail + * index. Before saving the queue-state, vDPA driver waits until + * the queue is disabled from backend. + */ + q_disable_try = 10; + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) + msec_delay(10); + + if (!q_disable_try) + WARNINGOUT("Failed to disable Q:%u, Saved state could be invalid\n", i); + if (hw->device_type == IFCVF_BLK) ring_state = *(u32 *)(hw->lm_cfg + IFCVF_LM_RING_STATE_OFFSET + -- 2.31.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH v5] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-03 9:35 ` [PATCH v5] " Abhishek Maheshwari @ 2022-11-04 2:31 ` Xia, Chenbo 2022-11-04 2:38 ` Mandal, Purna Chandra 2022-11-10 7:02 ` Xia, Chenbo 2 siblings, 0 replies; 9+ messages in thread From: Xia, Chenbo @ 2022-11-04 2:31 UTC (permalink / raw) To: Maheshwari, Abhishek, maxime.coquelin, Wang, Xiao W Cc: dev, stable, Mandal, Purna Chandra, Pei, Andy > -----Original Message----- > From: Maheshwari, Abhishek <abhishek.maheshwari@intel.com> > Sent: Thursday, November 3, 2022 5:35 PM > To: maxime.coquelin@redhat.com; Wang, Xiao W <xiao.w.wang@intel.com> > Cc: dev@dpdk.org; stable@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; > Mandal, Purna Chandra <purna.chandra.mandal@intel.com>; Maheshwari, > Abhishek <abhishek.maheshwari@intel.com> > Subject: [PATCH v5] vdpa/ifc/base: wait for queue disable before saving q- > state > > Some ifc hardware require synchronization between disabling a queue and > saving queue-state from LM registers. When queue is disabled from vDPA > driver, ifc device stops executing new virtio-cmds and then updates LM > registers with used/avail index. Before saving the queue-state, vDPA > driver should wait until the queue is disabled from backend. > > Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") > Will remove above blank line and add Andy's A-By when applying For this patch: Reviewed-by: Chenbo Xia <chenbo.xia@intel.com> > Cc: stable@dpdk.org > > Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> > > --- > v2: > * Fixing the styling issues > * Addressing comment to avoid reading the register again after > exhausting the tries > > v3: > * Fixing warning condition > > v4: > * Fixing print argument format to %u in warning > > v5: > * Addressing comments based on input that line length limit is 100 > --- > drivers/vdpa/ifc/base/ifcvf.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c > index f1e1474447..60555a6786 100644 > --- a/drivers/vdpa/ifc/base/ifcvf.c > +++ b/drivers/vdpa/ifc/base/ifcvf.c > @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > u32 i; > struct ifcvf_pci_common_cfg *cfg; > u32 ring_state; > + int q_disable_try; > > cfg = hw->common_cfg; > if (!cfg) { > @@ -275,6 +276,20 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > continue; > } > > + /* Some ifc hardware require synchronization between disabling > a > + * queue and saving queue-state from LM registers. When queue > is > + * disabled from vDPA driver, ifc device stops executing new > + * virtio-cmds and then updates LM registers with used/avail > + * index. Before saving the queue-state, vDPA driver waits > until > + * the queue is disabled from backend. > + */ > + q_disable_try = 10; > + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) > + msec_delay(10); > + > + if (!q_disable_try) > + WARNINGOUT("Failed to disable Q:%u, Saved state could be > invalid\n", i); > + > if (hw->device_type == IFCVF_BLK) > ring_state = *(u32 *)(hw->lm_cfg + > IFCVF_LM_RING_STATE_OFFSET + > -- > 2.31.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH v5] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-03 9:35 ` [PATCH v5] " Abhishek Maheshwari 2022-11-04 2:31 ` Xia, Chenbo @ 2022-11-04 2:38 ` Mandal, Purna Chandra 2022-11-10 7:02 ` Xia, Chenbo 2 siblings, 0 replies; 9+ messages in thread From: Mandal, Purna Chandra @ 2022-11-04 2:38 UTC (permalink / raw) To: Maheshwari, Abhishek, maxime.coquelin, Wang, Xiao W Cc: dev, stable, Xia, Chenbo -----Original Message----- From: Maheshwari, Abhishek <abhishek.maheshwari@intel.com> Sent: Thursday, November 3, 2022 3:05 PM To: maxime.coquelin@redhat.com; Wang, Xiao W <xiao.w.wang@intel.com> Cc: dev@dpdk.org; stable@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; Mandal, Purna Chandra <purna.chandra.mandal@intel.com>; Maheshwari, Abhishek <abhishek.maheshwari@intel.com> Subject: [PATCH v5] vdpa/ifc/base: wait for queue disable before saving q-state Some ifc hardware require synchronization between disabling a queue and saving queue-state from LM registers. When queue is disabled from vDPA driver, ifc device stops executing new virtio-cmds and then updates LM registers with used/avail index. Before saving the queue-state, vDPA driver should wait until the queue is disabled from backend. Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") Cc: stable@dpdk.org Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> --- v2: * Fixing the styling issues * Addressing comment to avoid reading the register again after exhausting the tries v3: * Fixing warning condition v4: * Fixing print argument format to %u in warning v5: * Addressing comments based on input that line length limit is 100 --- drivers/vdpa/ifc/base/ifcvf.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c index f1e1474447..60555a6786 100644 --- a/drivers/vdpa/ifc/base/ifcvf.c +++ b/drivers/vdpa/ifc/base/ifcvf.c @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) u32 i; struct ifcvf_pci_common_cfg *cfg; u32 ring_state; + int q_disable_try; cfg = hw->common_cfg; if (!cfg) { @@ -275,6 +276,20 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) continue; } + /* Some ifc hardware require synchronization between disabling a + * queue and saving queue-state from LM registers. When queue is + * disabled from vDPA driver, ifc device stops executing new + * virtio-cmds and then updates LM registers with used/avail + * index. Before saving the queue-state, vDPA driver waits until + * the queue is disabled from backend. + */ + q_disable_try = 10; + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) + msec_delay(10); + + if (!q_disable_try) + WARNINGOUT("Failed to disable Q:%u, Saved state could be invalid\n", +i); + if (hw->device_type == IFCVF_BLK) ring_state = *(u32 *)(hw->lm_cfg + IFCVF_LM_RING_STATE_OFFSET + -- 2.31.1 Ack. Reviewed by Purna Chandra Mandal <purna.chandra,mandal@intel.com> ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: [PATCH v5] vdpa/ifc/base: wait for queue disable before saving q-state 2022-11-03 9:35 ` [PATCH v5] " Abhishek Maheshwari 2022-11-04 2:31 ` Xia, Chenbo 2022-11-04 2:38 ` Mandal, Purna Chandra @ 2022-11-10 7:02 ` Xia, Chenbo 2 siblings, 0 replies; 9+ messages in thread From: Xia, Chenbo @ 2022-11-10 7:02 UTC (permalink / raw) To: Maheshwari, Abhishek, maxime.coquelin, Wang, Xiao W Cc: dev, stable, Mandal, Purna Chandra > -----Original Message----- > From: Maheshwari, Abhishek <abhishek.maheshwari@intel.com> > Sent: Thursday, November 3, 2022 5:35 PM > To: maxime.coquelin@redhat.com; Wang, Xiao W <xiao.w.wang@intel.com> > Cc: dev@dpdk.org; stable@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; > Mandal, Purna Chandra <purna.chandra.mandal@intel.com>; Maheshwari, > Abhishek <abhishek.maheshwari@intel.com> > Subject: [PATCH v5] vdpa/ifc/base: wait for queue disable before saving q- > state > > Some ifc hardware require synchronization between disabling a queue and > saving queue-state from LM registers. When queue is disabled from vDPA > driver, ifc device stops executing new virtio-cmds and then updates LM > registers with used/avail index. Before saving the queue-state, vDPA > driver should wait until the queue is disabled from backend. > > Fixes: 5d75517beffe ("vdpa/ifc/base: access block device registers") > > Cc: stable@dpdk.org > > Signed-off-by: Abhishek Maheshwari <abhishek.maheshwari@intel.com> > > --- > v2: > * Fixing the styling issues > * Addressing comment to avoid reading the register again after > exhausting the tries > > v3: > * Fixing warning condition > > v4: > * Fixing print argument format to %u in warning > > v5: > * Addressing comments based on input that line length limit is 100 > --- > drivers/vdpa/ifc/base/ifcvf.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > > diff --git a/drivers/vdpa/ifc/base/ifcvf.c b/drivers/vdpa/ifc/base/ifcvf.c > index f1e1474447..60555a6786 100644 > --- a/drivers/vdpa/ifc/base/ifcvf.c > +++ b/drivers/vdpa/ifc/base/ifcvf.c > @@ -257,6 +257,7 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > u32 i; > struct ifcvf_pci_common_cfg *cfg; > u32 ring_state; > + int q_disable_try; > > cfg = hw->common_cfg; > if (!cfg) { > @@ -275,6 +276,20 @@ ifcvf_hw_disable(struct ifcvf_hw *hw) > continue; > } > > + /* Some ifc hardware require synchronization between disabling > a > + * queue and saving queue-state from LM registers. When queue > is > + * disabled from vDPA driver, ifc device stops executing new > + * virtio-cmds and then updates LM registers with used/avail > + * index. Before saving the queue-state, vDPA driver waits > until > + * the queue is disabled from backend. > + */ > + q_disable_try = 10; > + while (q_disable_try-- && IFCVF_READ_REG16(&cfg->queue_enable)) > + msec_delay(10); > + > + if (!q_disable_try) > + WARNINGOUT("Failed to disable Q:%u, Saved state could be > invalid\n", i); > + > if (hw->device_type == IFCVF_BLK) > ring_state = *(u32 *)(hw->lm_cfg + > IFCVF_LM_RING_STATE_OFFSET + > -- > 2.31.1 Applied to next-virtio/main, thanks ^ permalink raw reply [flat|nested] 9+ messages in thread
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2022-11-02 3:22 ` [PATCH v2] vdpa/ifc/base: wait for queue disable before saving q-state Abhishek Maheshwari
2022-11-02 9:54 ` [PATCH v3] " Abhishek Maheshwari
2022-11-02 14:56 ` Pei, Andy
2022-11-03 2:37 ` Xia, Chenbo
2022-11-03 4:36 ` [PATCH v4] " Abhishek Maheshwari
2022-11-03 9:35 ` [PATCH v5] " Abhishek Maheshwari
2022-11-04 2:31 ` Xia, Chenbo
2022-11-04 2:38 ` Mandal, Purna Chandra
2022-11-10 7:02 ` Xia, Chenbo
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