add dpdk patch file

patch/dpdk-16.07/0001-kni-use-netlink-event-for-multicast-driver-part.patch

@@ -0,0 +1,107 @@
+From 8d6d303be80c246cf0c92b143432aede255c9238 Mon Sep 17 00:00:00 2001
+From: Lei Chen <raychen@qiyi.com>
+Date: Fri, 3 Mar 2017 14:49:17 +0800
+Subject: [PATCH] kni: use netlink event for multicast (driver part).
+
+kni driver send netlink event every time hw-multicast list updated by
+kernel, the user kni app should capture the event and update multicast
+to kni device.
+
+original way is using rte_kni_request to pass hw-multicast to user kni
+module. that method works but finally memory corruption found, which is
+not easy to address.
+---
+ lib/librte_eal/linuxapp/kni/kni_net.c | 67 +++++++++++++++++++++++++++++++++++
+ 1 file changed, 67 insertions(+)
+
+diff --git a/lib/librte_eal/linuxapp/kni/kni_net.c b/lib/librte_eal/linuxapp/kni/kni_net.c
+index fc82193..952e9b8 100644
+--- a/lib/librte_eal/linuxapp/kni/kni_net.c
++++ b/lib/librte_eal/linuxapp/kni/kni_net.c
+@@ -35,6 +35,8 @@
+ #include <linux/skbuff.h>
+ #include <linux/kthread.h>
+ #include <linux/delay.h>
++#include <linux/inetdevice.h>
++#include <net/netlink.h>
+
+ #include <exec-env/rte_kni_common.h>
+ #include <kni_fifo.h>
+@@ -527,9 +529,74 @@ kni_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+ 	return 0;
+ }
+
++static size_t kni_nlmsg_size(void)
++{
++	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
++	       + nla_total_size(4) /* IFA_ADDRESS */
++	       + nla_total_size(4) /* IFA_LOCAL */
++	       + nla_total_size(4) /* IFA_BROADCAST */
++	       + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
++	       + nla_total_size(4) /* IFA_FLAGS */
++	       + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
++}
++
+ static void
+ kni_net_set_rx_mode(struct net_device *dev)
+ {
++	/*
++	 * send event to notify user (DPDK KNI app) that multicast list changed,
++	 * so that it can monitor multicast join/leave and set HW mc-addrs to
++	 * kni dev accordinglly.
++	 *
++	 * this event is just an notification, we do not save any mc-addr here
++	 * (so attribute space for us). user kni app should get maddrs after
++	 * receive this notification.
++	 *
++	 * I was expecting kernel send some rtnl event for multicast join/leave,
++	 * but it doesn't. By checking the call-chain of SIOCADDMULTI (ip maddr,
++	 * manages only hardware multicast) and IP_ADD_MEMBERSHIP (ip_mc_join_group,
++	 * used to for IPv4 multicast), no rtnl event sent.
++	 *
++	 * so as workaround, modify kni driver here to send RTM_NEWADDR.
++	 * it may not suitalbe to use this event for mcast, but that should works.
++	 * hope that won't affect other listener to this event.
++	 *
++	 * previous solution was using rte_kni_request to pass hw-maddr list to user.
++	 * it "works" for times but finally memory corruption found, which is
++	 * not easy to address (lock was added and reviewed). That's why we use
++	 * netlink event instead.
++	 */
++	struct sk_buff *skb;
++	struct net *net = dev_net(dev);
++	struct nlmsghdr *nlh;
++	struct ifaddrmsg *ifm;
++
++	skb = nlmsg_new(kni_nlmsg_size(), GFP_KERNEL);
++	if (!skb)
++		return;
++
++	/* no other event for us ? */
++	nlh = nlmsg_put(skb, 0, 0, RTM_NEWADDR, sizeof(*ifm), 0);
++	if (!nlh) {
++		kfree_skb(skb);
++		return;
++	}
++
++	/* just send an notification so no other info */
++	ifm = nlmsg_data(nlh);
++	memset(ifm, 0, sizeof(*ifm));
++	ifm->ifa_family = AF_UNSPEC;
++	ifm->ifa_prefixlen = 0;
++	ifm->ifa_flags = 0;
++	ifm->ifa_scope = RT_SCOPE_NOWHERE;
++	ifm->ifa_index = 0;
++
++	nlmsg_end(skb, nlh);
++
++	/* other group ? */
++	KNI_DBG("%s: rx-mode/multicast-list changed\n", __func__);
++	rtnl_notify(skb, net, 0, RTNLGRP_NOTIFY, NULL, GFP_KERNEL);
++	return;
+ }
+
+ static int
+-- 
+2.7.4
+