[PATCH net-next 5/5] net: mvpp2: jumbo frames support
From: Antoine Tenart
Date: Fri Mar 02 2018 - 10:47:47 EST
From: Stefan Chulski <stefanc@xxxxxxxxxxx>
This patch adds the support for jumbo frames in the Marvell PPv2 driver.
A third buffer pool is added with 10KB buffers, which is used if the MTU
is higher than 1518B for packets larger than 1518B. Please note only the
port 0 supports hardware checksum offload due to the Tx FIFO size
limitation.
Signed-off-by: Stefan Chulski <stefanc@xxxxxxxxxxx>
[Antoine: cosmetic cleanup, commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@xxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvpp2.c | 96 +++++++++++++++++++++++++++---------
1 file changed, 74 insertions(+), 22 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index 31a2c3039e2e..543e8c11a47f 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -815,6 +815,7 @@ enum mvpp2_prs_l3_cast {
#define MVPP22_RSS_TABLE_ENTRIES 32
/* BM constants */
+#define MVPP2_BM_JUMBO_BUF_NUM 512
#define MVPP2_BM_LONG_BUF_NUM 1024
#define MVPP2_BM_SHORT_BUF_NUM 2048
#define MVPP2_BM_POOL_SIZE_MAX (16*1024 - MVPP2_BM_POOL_PTR_ALIGN/4)
@@ -826,12 +827,14 @@ enum mvpp2_prs_l3_cast {
#define MVPP2_BM_SHORT_FRAME_SIZE 512
#define MVPP2_BM_LONG_FRAME_SIZE 2048
+#define MVPP2_BM_JUMBO_FRAME_SIZE 10240
/* BM short pool packet size
* These value assure that for SWF the total number
* of bytes allocated for each buffer will be 512
*/
#define MVPP2_BM_SHORT_PKT_SIZE MVPP2_RX_MAX_PKT_SIZE(MVPP2_BM_SHORT_FRAME_SIZE)
#define MVPP2_BM_LONG_PKT_SIZE MVPP2_RX_MAX_PKT_SIZE(MVPP2_BM_LONG_FRAME_SIZE)
+#define MVPP2_BM_JUMBO_PKT_SIZE MVPP2_RX_MAX_PKT_SIZE(MVPP2_BM_JUMBO_FRAME_SIZE)
#define MVPP21_ADDR_SPACE_SZ 0
#define MVPP22_ADDR_SPACE_SZ SZ_64K
@@ -842,6 +845,7 @@ enum mvpp2_prs_l3_cast {
enum mvpp2_bm_pool_log_num {
MVPP2_BM_SHORT,
MVPP2_BM_LONG,
+ MVPP2_BM_JUMBO,
MVPP2_BM_POOLS_NUM
};
@@ -4393,6 +4397,10 @@ static void mvpp2_setup_bm_pool(void)
/* Long pool */
mvpp2_pools[MVPP2_BM_LONG].buf_num = MVPP2_BM_LONG_BUF_NUM;
mvpp2_pools[MVPP2_BM_LONG].pkt_size = MVPP2_BM_LONG_PKT_SIZE;
+
+ /* Jumbo pool */
+ mvpp2_pools[MVPP2_BM_JUMBO].buf_num = MVPP2_BM_JUMBO_BUF_NUM;
+ mvpp2_pools[MVPP2_BM_JUMBO].pkt_size = MVPP2_BM_JUMBO_PKT_SIZE;
}
/* Attach long pool to rxq */
@@ -4551,7 +4559,7 @@ mvpp2_bm_pool_use(struct mvpp2_port *port, int pool, int pkt_size)
struct mvpp2_bm_pool *new_pool = &port->priv->bm_pools[pool];
int num;
- if (pool < MVPP2_BM_SHORT || pool > MVPP2_BM_LONG) {
+ if (pool < MVPP2_BM_SHORT || pool > MVPP2_BM_JUMBO) {
netdev_err(port->dev, "Invalid pool %d\n", pool);
return NULL;
}
@@ -4596,11 +4604,24 @@ mvpp2_bm_pool_use(struct mvpp2_port *port, int pool, int pkt_size)
static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
{
int rxq;
+ enum mvpp2_bm_pool_log_num long_log_pool, short_log_pool;
+
+ /* If port pkt_size is higher than 1518B:
+ * HW Long pool - SW Jumbo pool, HW Short pool - SW Short pool
+ * else: HW Long pool - SW Long pool, HW Short pool - SW Short pool
+ */
+ if (port->pkt_size > MVPP2_BM_LONG_PKT_SIZE) {
+ long_log_pool = MVPP2_BM_JUMBO;
+ short_log_pool = MVPP2_BM_LONG;
+ } else {
+ long_log_pool = MVPP2_BM_LONG;
+ short_log_pool = MVPP2_BM_SHORT;
+ }
if (!port->pool_long) {
port->pool_long =
- mvpp2_bm_pool_use(port, MVPP2_BM_LONG,
- mvpp2_pools[MVPP2_BM_LONG].pkt_size);
+ mvpp2_bm_pool_use(port, long_log_pool,
+ mvpp2_pools[long_log_pool].pkt_size);
if (!port->pool_long)
return -ENOMEM;
@@ -4612,8 +4633,8 @@ static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
if (!port->pool_short) {
port->pool_short =
- mvpp2_bm_pool_use(port, MVPP2_BM_SHORT,
- mvpp2_pools[MVPP2_BM_SHORT].pkt_size);
+ mvpp2_bm_pool_use(port, short_log_pool,
+ mvpp2_pools[long_log_pool].pkt_size);
if (!port->pool_short)
return -ENOMEM;
@@ -4630,24 +4651,49 @@ static int mvpp2_swf_bm_pool_init(struct mvpp2_port *port)
static int mvpp2_bm_update_mtu(struct net_device *dev, int mtu)
{
struct mvpp2_port *port = netdev_priv(dev);
- struct mvpp2_bm_pool *port_pool = port->pool_long;
- int num, pkts_num = port_pool->buf_num;
+ enum mvpp2_bm_pool_log_num new_long_pool;
+ int pkt_size = MVPP2_RX_PKT_SIZE(mtu);
- /* Update BM pool with new buffer size */
- mvpp2_bm_bufs_free(dev->dev.parent, port->priv, port_pool,
- port_pool->buf_num);
- if (port_pool->buf_num) {
- WARN(1, "cannot free all buffers in pool %d\n", port_pool->id);
- return -EIO;
+ /* If port MTU is higher than 1518B:
+ * HW Long pool - SW Jumbo pool, HW Short pool - SW Short pool
+ * else: HW Long pool - SW Long pool, HW Short pool - SW Short pool
+ */
+ if (pkt_size > MVPP2_BM_LONG_PKT_SIZE)
+ new_long_pool = MVPP2_BM_JUMBO;
+ else
+ new_long_pool = MVPP2_BM_LONG;
+
+ if (new_long_pool != port->pool_long->id) {
+ /* Remove port from old short & long pool */
+ port->pool_long = mvpp2_bm_pool_use(port, port->pool_long->id,
+ port->pool_long->pkt_size);
+ port->pool_long->port_map &= ~(1 << port->id);
+ port->pool_long = NULL;
+
+ port->pool_short = mvpp2_bm_pool_use(port, port->pool_short->id,
+ port->pool_short->pkt_size);
+ port->pool_short->port_map &= ~(1 << port->id);
+ port->pool_short = NULL;
+
+ port->pkt_size = pkt_size;
+
+ /* Add port to new short & long pool */
+ mvpp2_swf_bm_pool_init(port);
+
+ /* Update L4 checksum when jumbo enable/disable on port */
+ if (new_long_pool == MVPP2_BM_JUMBO && port->id != 0) {
+ dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+ dev->hw_features &= ~(NETIF_F_IP_CSUM |
+ NETIF_F_IPV6_CSUM);
+ } else {
+ dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+ dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+ }
}
- num = mvpp2_bm_bufs_add(port, port_pool, pkts_num);
- if (num != pkts_num) {
- WARN(1, "pool %d: %d of %d allocated\n",
- port_pool->id, num, pkts_num);
- return -EIO;
- }
dev->mtu = mtu;
+ dev->wanted_features = dev->features;
+
netdev_update_features(dev);
return 0;
}
@@ -8326,13 +8372,19 @@ static int mvpp2_port_probe(struct platform_device *pdev,
dev->features = features | NETIF_F_RXCSUM;
dev->hw_features |= features | NETIF_F_RXCSUM | NETIF_F_GRO |
NETIF_F_HW_VLAN_CTAG_FILTER;
+
+ if (port->pool_long->id == MVPP2_BM_JUMBO && port->id != 0) {
+ dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+ dev->hw_features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+ }
+
dev->vlan_features |= features;
dev->gso_max_segs = MVPP2_MAX_TSO_SEGS;
- /* MTU range: 68 - 9676 */
+ /* MTU range: 68 - 9704 */
dev->min_mtu = ETH_MIN_MTU;
- /* 9676 == 9700 - 20 and rounding to 8 */
- dev->max_mtu = 9676;
+ /* 9704 == 9728 - 20 and rounding to 8 */
+ dev->max_mtu = MVPP2_BM_JUMBO_PKT_SIZE;
err = register_netdev(dev);
if (err < 0) {
--
2.14.3