[PATCH 5.4 051/108] bnxt_en: Improve bnxt_ulp_stop()/bnxt_ulp_start() call sequence.

Greg Kroah-Hartman
2021-07-26T16:05:54Z

From: Vasundhara Volam <vasundhara-v.volam@broadcom.com>

[ Upstream commit aa46dffff452f7c6d907c4e6a0062e2c53a87fc0 ]

We call bnxt_ulp_stop() to notify the RDMA driver that some error or
imminent reset is about to happen. After that we always call
some variants of bnxt_close().

In the next patch, we will integrate the recently added error
recovery with the RDMA driver. In response to ulp_stop, the
RDMA driver may free MSIX vectors and that will also trigger
bnxt_close(). To avoid bnxt_close() from being called twice,
we set a new flag after ulp_stop is called. If the RDMA driver
frees MSIX vectors while the new flag is set, we will not call
bnxt_close(), knowing that it will happen in due course.

With this change, we must make sure that the bnxt_close() call
after ulp_stop will reset IRQ. Modify bnxt_reset_task()
accordingly if we call ulp_stop.

Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 18 ++++++++++--------
drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c | 10 ++++++++--
drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h | 3 ++-
3 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index d1c3939b0307..e840aae894ff 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -9987,12 +9987,15 @@ static void bnxt_reset_task(struct bnxt *bp, bool silent)
if (netif_running(bp->dev)) {
int rc;

- if (!silent)
+ if (silent) {
+ bnxt_close_nic(bp, false, false);
+ bnxt_open_nic(bp, false, false);
+ } else {
bnxt_ulp_stop(bp);
- bnxt_close_nic(bp, false, false);
- rc = bnxt_open_nic(bp, false, false);
- if (!silent && !rc)
- bnxt_ulp_start(bp);
+ bnxt_close_nic(bp, true, false);
+ rc = bnxt_open_nic(bp, true, false);
+ bnxt_ulp_start(bp, rc);
+ }
}
}

@@ -12144,10 +12147,9 @@ static pci_ers_result_t bnxt_io_slot_reset(struct pci_dev *pdev)
if (!err && netif_running(netdev))
err = bnxt_open(netdev);

- if (!err) {
+ if (!err)
result = PCI_ERS_RESULT_RECOVERED;
- bnxt_ulp_start(bp);
- }
+ bnxt_ulp_start(bp, err);
}

if (result != PCI_ERS_RESULT_RECOVERED) {
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
index 13ef6a9afaa0..85bacaed763e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c
@@ -186,7 +186,7 @@ static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)

edev->ulp_tbl[ulp_id].msix_requested = 0;
edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
- if (netif_running(dev)) {
+ if (netif_running(dev) && !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) {
bnxt_close_nic(bp, true, false);
bnxt_open_nic(bp, true, false);
}
@@ -274,6 +274,7 @@ void bnxt_ulp_stop(struct bnxt *bp)
if (!edev)
return;

+ edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
for (i = 0; i < BNXT_MAX_ULP; i++) {
struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

@@ -284,7 +285,7 @@ void bnxt_ulp_stop(struct bnxt *bp)
}
}

-void bnxt_ulp_start(struct bnxt *bp)
+void bnxt_ulp_start(struct bnxt *bp, int err)
{
struct bnxt_en_dev *edev = bp->edev;
struct bnxt_ulp_ops *ops;
@@ -293,6 +294,11 @@ void bnxt_ulp_start(struct bnxt *bp)
if (!edev)
return;

+ edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
+
+ if (err)
+ return;
+
for (i = 0; i < BNXT_MAX_ULP; i++) {
struct bnxt_ulp *ulp = &edev->ulp_tbl[i];

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
index cd78453d0bf0..9895406b9830 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h
@@ -64,6 +64,7 @@ struct bnxt_en_dev {
#define BNXT_EN_FLAG_ROCE_CAP (BNXT_EN_FLAG_ROCEV1_CAP | \
BNXT_EN_FLAG_ROCEV2_CAP)
#define BNXT_EN_FLAG_MSIX_REQUESTED 0x4
+ #define BNXT_EN_FLAG_ULP_STOPPED 0x8
const struct bnxt_en_ops *en_ops;
struct bnxt_ulp ulp_tbl[BNXT_MAX_ULP];
};
@@ -92,7 +93,7 @@ int bnxt_get_ulp_msix_num(struct bnxt *bp);
int bnxt_get_ulp_msix_base(struct bnxt *bp);
int bnxt_get_ulp_stat_ctxs(struct bnxt *bp);
void bnxt_ulp_stop(struct bnxt *bp);
-void bnxt_ulp_start(struct bnxt *bp);
+void bnxt_ulp_start(struct bnxt *bp, int err);
void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs);
void bnxt_ulp_shutdown(struct bnxt *bp);
void bnxt_ulp_irq_stop(struct bnxt *bp);
--
2.30.2