ibmvnic: convert rxpool ltb to a set of ltbs

Define and use interfaces that treat the long term buffer (LTB) of an
rxpool as a set of LTBs rather than a single LTB. The set only has one
LTB for now.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: Dany Madden <drt@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 2e60424..765a488 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -345,6 +345,41 @@ static void free_long_term_buff(struct ibmvnic_adapter *adapter,
        ltb->map_id = 0;
 }
 
+static void free_ltb_set(struct ibmvnic_adapter *adapter,
+                        struct ibmvnic_ltb_set *ltb_set)
+{
+       int i;
+
+       for (i = 0; i < ltb_set->num_ltbs; i++)
+               free_long_term_buff(adapter, &ltb_set->ltbs[i]);
+
+       kfree(ltb_set->ltbs);
+       ltb_set->ltbs = NULL;
+       ltb_set->num_ltbs = 0;
+}
+
+static int alloc_ltb_set(struct ibmvnic_adapter *adapter,
+                        struct ibmvnic_ltb_set *ltb_set, int num_buffs,
+                        int buff_size)
+{
+       struct ibmvnic_long_term_buff *ltb;
+       int ltb_size;
+       int size;
+
+       size = sizeof(struct ibmvnic_long_term_buff);
+
+       ltb_set->ltbs = kmalloc(size, GFP_KERNEL);
+       if (!ltb_set->ltbs)
+               return -ENOMEM;
+
+       ltb_set->num_ltbs = 1;
+       ltb = &ltb_set->ltbs[0];
+
+       ltb_size = num_buffs * buff_size;
+
+       return alloc_long_term_buff(adapter, ltb, ltb_size);
+}
+
 /**
  * map_rxpool_buf_to_ltb - Map given rxpool buffer to offset in an LTB.
  * @rxpool: The receive buffer pool containing buffer
@@ -360,7 +395,7 @@ static void map_rxpool_buf_to_ltb(struct ibmvnic_rx_pool *rxpool,
                                  struct ibmvnic_long_term_buff **ltbp,
                                  unsigned int *offset)
 {
-       *ltbp = &rxpool->long_term_buff;
+       *ltbp = &rxpool->ltb_set.ltbs[0];
        *offset = bufidx * rxpool->buff_size;
 }
 
@@ -618,7 +653,7 @@ static void release_rx_pools(struct ibmvnic_adapter *adapter)
 
                kfree(rx_pool->free_map);
 
-               free_long_term_buff(adapter, &rx_pool->long_term_buff);
+               free_ltb_set(adapter, &rx_pool->ltb_set);
 
                if (!rx_pool->rx_buff)
                        continue;
@@ -763,9 +798,8 @@ update_ltb:
                dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n",
                        i, rx_pool->size, rx_pool->buff_size);
 
-               rc = alloc_long_term_buff(adapter, &rx_pool->long_term_buff,
-                                         rx_pool->size * rx_pool->buff_size);
-               if (rc)
+               if (alloc_ltb_set(adapter, &rx_pool->ltb_set,
+                                 rx_pool->size, rx_pool->buff_size))
                        goto out;
 
                for (j = 0; j < rx_pool->size; ++j) {

diff --git a/drivers/net/ethernet/ibm/ibmvnic.h b/drivers/net/ethernet/ibm/ibmvnic.h
index 8f5cefb..7d430fd 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.h
+++ b/drivers/net/ethernet/ibm/ibmvnic.h
@@ -798,6 +798,11 @@ struct ibmvnic_long_term_buff {
        u8 map_id;
 };
 
+struct ibmvnic_ltb_set {
+       int num_ltbs;
+       struct ibmvnic_long_term_buff *ltbs;
+};
+
 struct ibmvnic_tx_buff {
        struct sk_buff *skb;
        int index;
@@ -833,7 +838,7 @@ struct ibmvnic_rx_pool {
        int next_free;
        int next_alloc;
        int active;
-       struct ibmvnic_long_term_buff long_term_buff;
+       struct ibmvnic_ltb_set ltb_set;
 } ____cacheline_aligned;
 
 struct ibmvnic_vpd {