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path: root/drivers/net/ethernet/chelsio/cxgb4/l2t.c
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Diffstat (limited to 'drivers/net/ethernet/chelsio/cxgb4/l2t.c')
-rw-r--r--drivers/net/ethernet/chelsio/cxgb4/l2t.c94
1 files changed, 54 insertions, 40 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb4/l2t.c b/drivers/net/ethernet/chelsio/cxgb4/l2t.c
index 252efc29321f..ac27898c6ab0 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/l2t.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/l2t.c
@@ -51,24 +51,17 @@
#define VLAN_NONE 0xfff
/* identifies sync vs async L2T_WRITE_REQs */
-#define F_SYNC_WR (1 << 12)
-
-enum {
- L2T_STATE_VALID, /* entry is up to date */
- L2T_STATE_STALE, /* entry may be used but needs revalidation */
- L2T_STATE_RESOLVING, /* entry needs address resolution */
- L2T_STATE_SYNC_WRITE, /* synchronous write of entry underway */
-
- /* when state is one of the below the entry is not hashed */
- L2T_STATE_SWITCHING, /* entry is being used by a switching filter */
- L2T_STATE_UNUSED /* entry not in use */
-};
+#define SYNC_WR_S 12
+#define SYNC_WR_V(x) ((x) << SYNC_WR_S)
+#define SYNC_WR_F SYNC_WR_V(1)
struct l2t_data {
+ unsigned int l2t_start; /* start index of our piece of the L2T */
+ unsigned int l2t_size; /* number of entries in l2tab */
rwlock_t lock;
atomic_t nfree; /* number of free entries */
struct l2t_entry *rover; /* starting point for next allocation */
- struct l2t_entry l2tab[L2T_SIZE];
+ struct l2t_entry l2tab[0]; /* MUST BE LAST */
};
static inline unsigned int vlan_prio(const struct l2t_entry *e)
@@ -85,29 +78,36 @@ static inline void l2t_hold(struct l2t_data *d, struct l2t_entry *e)
/*
* To avoid having to check address families we do not allow v4 and v6
* neighbors to be on the same hash chain. We keep v4 entries in the first
- * half of available hash buckets and v6 in the second.
+ * half of available hash buckets and v6 in the second. We need at least two
+ * entries in our L2T for this scheme to work.
*/
enum {
- L2T_SZ_HALF = L2T_SIZE / 2,
- L2T_HASH_MASK = L2T_SZ_HALF - 1
+ L2T_MIN_HASH_BUCKETS = 2,
};
-static inline unsigned int arp_hash(const u32 *key, int ifindex)
+static inline unsigned int arp_hash(struct l2t_data *d, const u32 *key,
+ int ifindex)
{
- return jhash_2words(*key, ifindex, 0) & L2T_HASH_MASK;
+ unsigned int l2t_size_half = d->l2t_size / 2;
+
+ return jhash_2words(*key, ifindex, 0) % l2t_size_half;
}
-static inline unsigned int ipv6_hash(const u32 *key, int ifindex)
+static inline unsigned int ipv6_hash(struct l2t_data *d, const u32 *key,
+ int ifindex)
{
+ unsigned int l2t_size_half = d->l2t_size / 2;
u32 xor = key[0] ^ key[1] ^ key[2] ^ key[3];
- return L2T_SZ_HALF + (jhash_2words(xor, ifindex, 0) & L2T_HASH_MASK);
+ return (l2t_size_half +
+ (jhash_2words(xor, ifindex, 0) % l2t_size_half));
}
-static unsigned int addr_hash(const u32 *addr, int addr_len, int ifindex)
+static unsigned int addr_hash(struct l2t_data *d, const u32 *addr,
+ int addr_len, int ifindex)
{
- return addr_len == 4 ? arp_hash(addr, ifindex) :
- ipv6_hash(addr, ifindex);
+ return addr_len == 4 ? arp_hash(d, addr, ifindex) :
+ ipv6_hash(d, addr, ifindex);
}
/*
@@ -139,6 +139,8 @@ static void neigh_replace(struct l2t_entry *e, struct neighbour *n)
*/
static int write_l2e(struct adapter *adap, struct l2t_entry *e, int sync)
{
+ struct l2t_data *d = adap->l2t;
+ unsigned int l2t_idx = e->idx + d->l2t_start;
struct sk_buff *skb;
struct cpl_l2t_write_req *req;
@@ -150,10 +152,10 @@ static int write_l2e(struct adapter *adap, struct l2t_entry *e, int sync)
INIT_TP_WR(req, 0);
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_L2T_WRITE_REQ,
- e->idx | (sync ? F_SYNC_WR : 0) |
+ l2t_idx | (sync ? SYNC_WR_F : 0) |
TID_QID_V(adap->sge.fw_evtq.abs_id)));
req->params = htons(L2T_W_PORT_V(e->lport) | L2T_W_NOREPLY_V(!sync));
- req->l2t_idx = htons(e->idx);
+ req->l2t_idx = htons(l2t_idx);
req->vlan = htons(e->vlan);
if (e->neigh && !(e->neigh->dev->flags & IFF_LOOPBACK))
memcpy(e->dmac, e->neigh->ha, sizeof(e->dmac));
@@ -190,18 +192,19 @@ static void send_pending(struct adapter *adap, struct l2t_entry *e)
*/
void do_l2t_write_rpl(struct adapter *adap, const struct cpl_l2t_write_rpl *rpl)
{
+ struct l2t_data *d = adap->l2t;
unsigned int tid = GET_TID(rpl);
- unsigned int idx = tid & (L2T_SIZE - 1);
+ unsigned int l2t_idx = tid % L2T_SIZE;
if (unlikely(rpl->status != CPL_ERR_NONE)) {
dev_err(adap->pdev_dev,
"Unexpected L2T_WRITE_RPL status %u for entry %u\n",
- rpl->status, idx);
+ rpl->status, l2t_idx);
return;
}
- if (tid & F_SYNC_WR) {
- struct l2t_entry *e = &adap->l2t->l2tab[idx];
+ if (tid & SYNC_WR_F) {
+ struct l2t_entry *e = &d->l2tab[l2t_idx - d->l2t_start];
spin_lock(&e->lock);
if (e->state != L2T_STATE_SWITCHING) {
@@ -276,7 +279,7 @@ static struct l2t_entry *alloc_l2e(struct l2t_data *d)
return NULL;
/* there's definitely a free entry */
- for (e = d->rover, end = &d->l2tab[L2T_SIZE]; e != end; ++e)
+ for (e = d->rover, end = &d->l2tab[d->l2t_size]; e != end; ++e)
if (atomic_read(&e->refcnt) == 0)
goto found;
@@ -368,7 +371,7 @@ struct l2t_entry *cxgb4_l2t_get(struct l2t_data *d, struct neighbour *neigh,
int addr_len = neigh->tbl->key_len;
u32 *addr = (u32 *)neigh->primary_key;
int ifidx = neigh->dev->ifindex;
- int hash = addr_hash(addr, addr_len, ifidx);
+ int hash = addr_hash(d, addr, addr_len, ifidx);
if (neigh->dev->flags & IFF_LOOPBACK)
lport = netdev2pinfo(physdev)->tx_chan + 4;
@@ -481,7 +484,7 @@ void t4_l2t_update(struct adapter *adap, struct neighbour *neigh)
int addr_len = neigh->tbl->key_len;
u32 *addr = (u32 *) neigh->primary_key;
int ifidx = neigh->dev->ifindex;
- int hash = addr_hash(addr, addr_len, ifidx);
+ int hash = addr_hash(d, addr, addr_len, ifidx);
read_lock_bh(&d->lock);
for (e = d->l2tab[hash].first; e; e = e->next)
@@ -554,20 +557,30 @@ int t4_l2t_set_switching(struct adapter *adap, struct l2t_entry *e, u16 vlan,
return write_l2e(adap, e, 0);
}
-struct l2t_data *t4_init_l2t(void)
+struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end)
{
+ unsigned int l2t_size;
int i;
struct l2t_data *d;
- d = t4_alloc_mem(sizeof(*d));
+ if (l2t_start >= l2t_end || l2t_end >= L2T_SIZE)
+ return NULL;
+ l2t_size = l2t_end - l2t_start + 1;
+ if (l2t_size < L2T_MIN_HASH_BUCKETS)
+ return NULL;
+
+ d = t4_alloc_mem(sizeof(*d) + l2t_size * sizeof(struct l2t_entry));
if (!d)
return NULL;
+ d->l2t_start = l2t_start;
+ d->l2t_size = l2t_size;
+
d->rover = d->l2tab;
- atomic_set(&d->nfree, L2T_SIZE);
+ atomic_set(&d->nfree, l2t_size);
rwlock_init(&d->lock);
- for (i = 0; i < L2T_SIZE; ++i) {
+ for (i = 0; i < d->l2t_size; ++i) {
d->l2tab[i].idx = i;
d->l2tab[i].state = L2T_STATE_UNUSED;
spin_lock_init(&d->l2tab[i].lock);
@@ -578,9 +591,9 @@ struct l2t_data *t4_init_l2t(void)
static inline void *l2t_get_idx(struct seq_file *seq, loff_t pos)
{
- struct l2t_entry *l2tab = seq->private;
+ struct l2t_data *d = seq->private;
- return pos >= L2T_SIZE ? NULL : &l2tab[pos];
+ return pos >= d->l2t_size ? NULL : &d->l2tab[pos];
}
static void *l2t_seq_start(struct seq_file *seq, loff_t *pos)
@@ -620,6 +633,7 @@ static int l2t_seq_show(struct seq_file *seq, void *v)
"Ethernet address VLAN/P LP State Users Port\n");
else {
char ip[60];
+ struct l2t_data *d = seq->private;
struct l2t_entry *e = v;
spin_lock_bh(&e->lock);
@@ -628,7 +642,7 @@ static int l2t_seq_show(struct seq_file *seq, void *v)
else
sprintf(ip, e->v6 ? "%pI6c" : "%pI4", e->addr);
seq_printf(seq, "%4u %-25s %17pM %4d %u %2u %c %5u %s\n",
- e->idx, ip, e->dmac,
+ e->idx + d->l2t_start, ip, e->dmac,
e->vlan & VLAN_VID_MASK, vlan_prio(e), e->lport,
l2e_state(e), atomic_read(&e->refcnt),
e->neigh ? e->neigh->dev->name : "");
@@ -652,7 +666,7 @@ static int l2t_seq_open(struct inode *inode, struct file *file)
struct adapter *adap = inode->i_private;
struct seq_file *seq = file->private_data;
- seq->private = adap->l2t->l2tab;
+ seq->private = adap->l2t;
}
return rc;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.