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Message-Id: <20201008190538.6223-3-dwilder@us.ibm.com>
Date: Thu, 8 Oct 2020 12:05:38 -0700
From: David Wilder <dwilder@...ibm.com>
To: netdev@...r.kernel.org
Cc: tlfalcon@...ux.ibm.com, cris.forno@....com,
pradeeps@...ux.vnet.ibm.com, wilder@...ibm.com
Subject: [ PATCH v1 2/2] ibmveth: Identify ingress large send packets.
Ingress large send packets are identified by either:
The IBMVETH_RXQ_LRG_PKT flag in the receive buffer
or with a -1 placed in the ip header checksum.
The method used depends on firmware version.
Signed-off-by: David Wilder <dwilder@...ibm.com>
Reviewed-by: Thomas Falcon <tlfalcon@...ux.ibm.com>
Reviewed-by: Cristobal Forno <cris.forno@....com>
Reviewed-by: Pradeep Satyanarayana <pradeeps@...ux.vnet.ibm.com>
---
drivers/net/ethernet/ibm/ibmveth.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 3935a7e..e357cbe 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -1349,6 +1349,7 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
int offset = ibmveth_rxq_frame_offset(adapter);
int csum_good = ibmveth_rxq_csum_good(adapter);
int lrg_pkt = ibmveth_rxq_large_packet(adapter);
+ __sum16 iph_check = 0;
skb = ibmveth_rxq_get_buffer(adapter);
@@ -1385,7 +1386,17 @@ static int ibmveth_poll(struct napi_struct *napi, int budget)
skb_put(skb, length);
skb->protocol = eth_type_trans(skb, netdev);
- if (length > netdev->mtu + ETH_HLEN) {
+ /* PHYP without PLSO support places a -1 in the ip
+ * checksum for large send frames.
+ */
+ if (be16_to_cpu(skb->protocol) == ETH_P_IP) {
+ struct iphdr *iph = (struct iphdr *)skb->data;
+
+ iph_check = iph->check;
+ }
+
+ if ((length > netdev->mtu + ETH_HLEN) ||
+ lrg_pkt || iph_check == 0xffff) {
ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
adapter->rx_large_packets++;
}
--
1.8.3.1
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