The max MTU is set to the max egress packet size allowed by the VIC
minus the size of a an IPv4 L2 header with .1Q (18 bytes).
Signed-off-by: John Daley <johndale at cisco.com>
---
drivers/net/enic/enic.h | 1 +
drivers/net/enic/enic_ethdev.c | 3 ++-
drivers/net/enic/enic_res.c | 25 +++++++++++++++++--------
drivers/net/enic/enic_res.h | 4 +++-
4 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h
index 1e6914e..78f7bd7 100644
--- a/drivers/net/enic/enic.h
+++ b/drivers/net/enic/enic.h
@@ -118,6 +118,7 @@ struct enic {
u8 ig_vlan_strip_en;
int link_status;
u8 hw_ip_checksum;
+ u16 max_mtu;
unsigned int flags;
unsigned int priv_flags;
diff --git a/drivers/net/enic/enic_ethdev.c b/drivers/net/enic/enic_ethdev.c
index 697ff82..31d9600 100644
--- a/drivers/net/enic/enic_ethdev.c
+++ b/drivers/net/enic/enic_ethdev.c
@@ -435,7 +435,8 @@ static void enicpmd_dev_info_get(struct rte_eth_dev
*eth_dev,
device_info->max_rx_queues = enic->rq_count;
device_info->max_tx_queues = enic->wq_count;
device_info->min_rx_bufsize = ENIC_MIN_MTU;
- device_info->max_rx_pktlen = enic->config.mtu;
+ device_info->max_rx_pktlen = enic->rte_dev->data->mtu
+ + ETHER_HDR_LEN + 4;
device_info->max_mac_addrs = 1;
device_info->rx_offload_capa =
DEV_RX_OFFLOAD_VLAN_STRIP |
diff --git a/drivers/net/enic/enic_res.c b/drivers/net/enic/enic_res.c
index ebe379d..e82181f 100644
--- a/drivers/net/enic/enic_res.c
+++ b/drivers/net/enic/enic_res.c
@@ -83,6 +83,20 @@ int enic_get_vnic_config(struct enic *enic)
GET_CONFIG(intr_timer_usec);
GET_CONFIG(loop_tag);
GET_CONFIG(num_arfs);
+ GET_CONFIG(max_pkt_size);
+
+ /* max packet size is only defined in newer VIC firmware
+ * and will be 0 for legacy firmware and VICs
+ */
+ if (c->max_pkt_size > ENIC_DEFAULT_MAX_PKT_SIZE)
+ enic->max_mtu = c->max_pkt_size - (ETHER_HDR_LEN + 4);
+ else
+ enic->max_mtu = ENIC_DEFAULT_MAX_PKT_SIZE - (ETHER_HDR_LEN + 4);
+ if (c->mtu == 0)
+ c->mtu = 1500;
+
+ enic->rte_dev->data->mtu = min_t(u16, enic->max_mtu,
+ max_t(u16, ENIC_MIN_MTU, c->mtu));
c->wq_desc_count =
min_t(u32, ENIC_MAX_WQ_DESCS,
@@ -96,21 +110,16 @@ int enic_get_vnic_config(struct enic *enic)
c->rq_desc_count));
c->rq_desc_count &= 0xffffffe0; /* must be aligned to groups of 32 */
- if (c->mtu == 0)
- c->mtu = 1500;
- c->mtu = min_t(u16, ENIC_MAX_MTU,
- max_t(u16, ENIC_MIN_MTU,
- c->mtu));
-
c->intr_timer_usec = min_t(u32, c->intr_timer_usec,
vnic_dev_get_intr_coal_timer_max(enic->vdev));
dev_info(enic_get_dev(enic),
"vNIC MAC addr %02x:%02x:%02x:%02x:%02x:%02x "
- "wq/rq %d/%d mtu %d\n",
+ "wq/rq %d/%d mtu %d, max mtu:%d\n",
enic->mac_addr[0], enic->mac_addr[1], enic->mac_addr[2],
enic->mac_addr[3], enic->mac_addr[4], enic->mac_addr[5],
- c->wq_desc_count, c->rq_desc_count, c->mtu);
+ c->wq_desc_count, c->rq_desc_count,
+ enic->rte_dev->data->mtu, enic->max_mtu);
dev_info(enic_get_dev(enic), "vNIC csum tx/rx %s/%s "
"rss %s intr mode %s type %s timer %d usec "
"loopback tag 0x%04x\n",
diff --git a/drivers/net/enic/enic_res.h b/drivers/net/enic/enic_res.h
index 3c8e303..303530e 100644
--- a/drivers/net/enic/enic_res.h
+++ b/drivers/net/enic/enic_res.h
@@ -46,7 +46,9 @@
#define ENIC_MAX_RQ_DESCS 4096
#define ENIC_MIN_MTU 68
-#define ENIC_MAX_MTU 9000
+
+/* Does not include (possible) inserted VLAN tag and FCS */
+#define ENIC_DEFAULT_MAX_PKT_SIZE 9022
#define ENIC_MULTICAST_PERFECT_FILTERS 32
#define ENIC_UNICAST_PERFECT_FILTERS 32
--
2.7.0
