Merge branch 'ibmvnic-reset-behavior-fixes'

John Allen says:

====================
ibmvnic: Reset behavior fixes

This patchset fixes a number of issues related to ibmvnic reset uncovered
from testing new Power9 machines with Everglades adapters and the new
functionality to change mtu and other parameters in the driver.

Changes since v1:
-In patch 1/3, added the line to free the long term buffers before
allocating a new one. This change inadvertently uncovered the problem
that the number of queues can change after a failover as well. To fix
this, we check whether or not the number of queues has changed in
do_reset and if they have, we do a full release and init of the queues.
-In patch 1/3, added variables to the adapter struct to track how
many rx/tx pools have actually been allocated and modify the release
pools routines to use these values rather than the possibly incorrect
req_rx/tx_queues values.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 60 insertions, 15 deletions

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index ab2e1917cd04..b65f5f3ac034 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -410,6 +410,10 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter)
         struct ibmvnic_rx_pool *rx_pool;
         int rx_scrqs;
         int i, j, rc;
+        u64 *size_array;
+
+        size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
+                be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
 
         rx_scrqs = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
         for (i = 0; i < rx_scrqs; i++) {
@@ -417,7 +421,17 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter)
 
                 netdev_dbg(adapter->netdev, "Re-setting rx_pool[%d]\n", i);
 
-                rc = reset_long_term_buff(adapter, &rx_pool->long_term_buff);
+                if (rx_pool->buff_size != be64_to_cpu(size_array[i])) {
+                        free_long_term_buff(adapter, &rx_pool->long_term_buff);
+                        rx_pool->buff_size = be64_to_cpu(size_array[i]);
+                        alloc_long_term_buff(adapter, &rx_pool->long_term_buff,
+                                             rx_pool->size *
+                                             rx_pool->buff_size);
+                } else {
+                        rc = reset_long_term_buff(adapter,
+                                                  &rx_pool->long_term_buff);
+                }
+
                 if (rc)
                         return rc;
 
@@ -439,14 +453,12 @@ static int reset_rx_pools(struct ibmvnic_adapter *adapter)
 static void release_rx_pools(struct ibmvnic_adapter *adapter)
 {
         struct ibmvnic_rx_pool *rx_pool;
-        int rx_scrqs;
         int i, j;
 
         if (!adapter->rx_pool)
                 return;
 
-        rx_scrqs = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
-        for (i = 0; i < rx_scrqs; i++) {
+        for (i = 0; i < adapter->num_active_rx_pools; i++) {
                 rx_pool = &adapter->rx_pool[i];
 
                 netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
@@ -469,6 +481,7 @@ static void release_rx_pools(struct ibmvnic_adapter *adapter)
 
         kfree(adapter->rx_pool);
         adapter->rx_pool = NULL;
+        adapter->num_active_rx_pools = 0;
 }
 
 static int init_rx_pools(struct net_device *netdev)
@@ -493,6 +506,8 @@ static int init_rx_pools(struct net_device *netdev)
                 return -1;
         }
 
+        adapter->num_active_rx_pools = 0;
+
         for (i = 0; i < rxadd_subcrqs; i++) {
                 rx_pool = &adapter->rx_pool[i];
 
@@ -536,6 +551,8 @@ static int init_rx_pools(struct net_device *netdev)
                 rx_pool->next_free = 0;
         }
 
+        adapter->num_active_rx_pools = rxadd_subcrqs;
+
         return 0;
 }
 
@@ -586,13 +603,12 @@ static void release_vpd_data(struct ibmvnic_adapter *adapter)
 static void release_tx_pools(struct ibmvnic_adapter *adapter)
 {
         struct ibmvnic_tx_pool *tx_pool;
-        int i, tx_scrqs;
+        int i;
 
         if (!adapter->tx_pool)
                 return;
 
-        tx_scrqs = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
-        for (i = 0; i < tx_scrqs; i++) {
+        for (i = 0; i < adapter->num_active_tx_pools; i++) {
                 netdev_dbg(adapter->netdev, "Releasing tx_pool[%d]\n", i);
                 tx_pool = &adapter->tx_pool[i];
                 kfree(tx_pool->tx_buff);
@@ -603,6 +619,7 @@ static void release_tx_pools(struct ibmvnic_adapter *adapter)
 
         kfree(adapter->tx_pool);
         adapter->tx_pool = NULL;
+        adapter->num_active_tx_pools = 0;
 }
 
 static int init_tx_pools(struct net_device *netdev)
@@ -619,6 +636,8 @@ static int init_tx_pools(struct net_device *netdev)
         if (!adapter->tx_pool)
                 return -1;
 
+        adapter->num_active_tx_pools = 0;
+
         for (i = 0; i < tx_subcrqs; i++) {
                 tx_pool = &adapter->tx_pool[i];
 
@@ -666,6 +685,8 @@ static int init_tx_pools(struct net_device *netdev)
                 tx_pool->producer_index = 0;
         }
 
+        adapter->num_active_tx_pools = tx_subcrqs;
+
         return 0;
 }
 
@@ -860,7 +881,7 @@ static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
         if (adapter->vpd->buff)
                 len = adapter->vpd->len;
 
-        reinit_completion(&adapter->fw_done);
+        init_completion(&adapter->fw_done);
         crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
         crq.get_vpd_size.cmd = GET_VPD_SIZE;
         ibmvnic_send_crq(adapter, &crq);
@@ -922,6 +943,13 @@ static int init_resources(struct ibmvnic_adapter *adapter)
         if (!adapter->vpd)
                 return -ENOMEM;
 
+        /* Vital Product Data (VPD) */
+        rc = ibmvnic_get_vpd(adapter);
+        if (rc) {
+                netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
+                return rc;
+        }
+
         adapter->map_id = 1;
         adapter->napi = kcalloc(adapter->req_rx_queues,
                                 sizeof(struct napi_struct), GFP_KERNEL);
@@ -995,7 +1023,7 @@ static int __ibmvnic_open(struct net_device *netdev)
 static int ibmvnic_open(struct net_device *netdev)
 {
         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
-        int rc, vpd;
+        int rc;
 
         mutex_lock(&adapter->reset_lock);
 
@@ -1018,11 +1046,6 @@ static int ibmvnic_open(struct net_device *netdev)
         rc = __ibmvnic_open(netdev);
         netif_carrier_on(netdev);
 
-        /* Vital Product Data (VPD) */
-        vpd = ibmvnic_get_vpd(adapter);
-        if (vpd)
-                netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
-
         mutex_unlock(&adapter->reset_lock);
 
         return rc;
@@ -1548,6 +1571,7 @@ static int ibmvnic_set_mac(struct net_device *netdev, void *p)
 static int do_reset(struct ibmvnic_adapter *adapter,
                     struct ibmvnic_rwi *rwi, u32 reset_state)
 {
+        u64 old_num_rx_queues, old_num_tx_queues;
         struct net_device *netdev = adapter->netdev;
         int i, rc;
 
@@ -1557,6 +1581,9 @@ static int do_reset(struct ibmvnic_adapter *adapter,
         netif_carrier_off(netdev);
         adapter->reset_reason = rwi->reset_reason;
 
+        old_num_rx_queues = adapter->req_rx_queues;
+        old_num_tx_queues = adapter->req_tx_queues;
+
         if (rwi->reset_reason == VNIC_RESET_MOBILITY) {
                 rc = ibmvnic_reenable_crq_queue(adapter);
                 if (rc)
@@ -1601,6 +1628,12 @@ static int do_reset(struct ibmvnic_adapter *adapter,
                         rc = init_resources(adapter);
                         if (rc)
                                 return rc;
+                } else if (adapter->req_rx_queues != old_num_rx_queues ||
+                           adapter->req_tx_queues != old_num_tx_queues) {
+                        release_rx_pools(adapter);
+                        release_tx_pools(adapter);
+                        init_rx_pools(netdev);
+                        init_tx_pools(netdev);
                 } else {
                         rc = reset_tx_pools(adapter);
                         if (rc)
@@ -3592,7 +3625,17 @@ static void handle_request_cap_rsp(union ibmvnic_crq *crq,
                          *req_value,
                          (long int)be64_to_cpu(crq->request_capability_rsp.
                                                number), name);
-                *req_value = be64_to_cpu(crq->request_capability_rsp.number);
+
+                if (be16_to_cpu(crq->request_capability_rsp.capability) ==
+                    REQ_MTU) {
+                        pr_err("mtu of %llu is not supported. Reverting.\n",
+                               *req_value);
+                        *req_value = adapter->fallback.mtu;
+                } else {
+                        *req_value =
+                                be64_to_cpu(crq->request_capability_rsp.number);
+                }
+
                 ibmvnic_send_req_caps(adapter, 1);
                 return;
         default:
diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index 4487f1e2c266..3aec42118db2 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -1091,6 +1091,8 @@ struct ibmvnic_adapter {
         u64 opt_rxba_entries_per_subcrq;
         __be64 tx_rx_desc_req;
         u8 map_id;
+        u64 num_active_rx_pools;
+        u64 num_active_tx_pools;
 
         struct tasklet_struct tasklet;
         enum vnic_state state;