kni: fix build on Ubuntu 14.04

Recent Ubuntu kernel 3.13.0-30.54, although based on Linux kernel 3.13.11,
already provides skb_set_hash() inline function, slightly different than
the one provided by lib/librte_eal/linuxapp/kni/ethtool/igb/kcompat.h

Ubuntu kernel 3.13.0-30.54 provides:
    * i40e/i40evf: i40e implementation for skb_set_hash
    - https://bugs.launchpad.net/bugs/1328037
    - http://changelogs.ubuntu.com/changelogs/pool/main/l/linux/linux_3.13.0-30.54/changelog

As a result, the implementation provided by kcompat.h must be skipped.
It is not appropriate to test whether LINUX_VERSION_CODE >= KERNEL_VERSION(3,13,11)
because previous Ubuntu kernel 3.13.0-29.53, already based on 3.13.11, needs to
get the implementation provided by kcompat.h

So the full Ubuntu kernel version numbering scheme must be tested:
<base kernel version>-<ABI number>.<upload number>-<flavour>
See "What does a specific Ubuntu kernel version number mean?"
and "How can we determine the version of the running kernel?"
at: https://wiki.ubuntu.com/Kernel/FAQ

Unlike RHEL_RELEASE_CODE, there is no such UBUNTU_RELEASE_CODE available out of
the box, so it needs to be crafted from the Makefile
Similarly, UBUNTU_KERNEL_CODE is generated with ABI and upload numbers.

`lsb_release -si` is first used to check whether we are running Ubuntu
`lsb_release -sr` provides release number 14.04, then converted to integer 1404
/proc/version_signature is parsed to get base kernel version, ABI and upload
numbers, and flavour is dropped

UBUNTU_KERNEL_CODE is indirectly defined using the UBUNTU_KERNEL_VERSION macro,
which in turn is defined in kcompat.h
This makes a single place to define the Ubuntu kernel version numbering scheme,
which is slightly different than the usual "shift by 8" scheme: ABI numbers can
be big (see: https://wiki.ubuntu.com/Kernel/Dev/TopicBranches), so 16-bits have
been reserved for them.

Finally, the implementaion of skb_set_hash is skipped in kcompat.h if we are
running Ubuntu 14.04 with an Ubuntu kernel >= 3.13.0-30.54

Signed-off-by: Patrice Buriez <patrice.buriez@intel.com>
[Thomas: simpler form, use tr instead of subst]
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>

diff --git a/lib/librte_eal/linuxapp/kni/Makefile b/lib/librte_eal/linuxapp/kni/Makefile
index fb9462f..4b5d873 100644 (file)
--- a/lib/librte_eal/linuxapp/kni/Makefile
+++ b/lib/librte_eal/linuxapp/kni/Makefile
@@ -44,6 +44,13 @@ MODULE_CFLAGS += -I$(RTE_OUTPUT)/include -I$(SRCDIR)/ethtool/ixgbe -I$(SRCDIR)/e
 MODULE_CFLAGS += -include $(RTE_OUTPUT)/include/rte_config.h
 MODULE_CFLAGS += -Wall -Werror
 
+ifeq ($(shell lsb_release -si 2>/dev/null),Ubuntu)
+MODULE_CFLAGS += -DUBUNTU_RELEASE_CODE=$(shell lsb_release -sr | tr -d .)
+UBUNTU_KERNEL_CODE := $(shell cut -d' ' -f2 /proc/version_signature |
+                        cut -d- -f1,2 | tr .- $(comma))
+MODULE_CFLAGS += -D"UBUNTU_KERNEL_CODE=UBUNTU_KERNEL_VERSION($(UBUNTU_KERNEL_CODE))"
+endif
+
 # this lib needs main eal
 DEPDIRS-y += lib/librte_eal/linuxapp/eal
 

diff --git a/lib/librte_eal/linuxapp/kni/ethtool/igb/kcompat.h b/lib/librte_eal/linuxapp/kni/ethtool/igb/kcompat.h
index 521a35d..5a06383 100644 (file)
--- a/lib/librte_eal/linuxapp/kni/ethtool/igb/kcompat.h
+++ b/lib/librte_eal/linuxapp/kni/ethtool/igb/kcompat.h
@@ -713,6 +713,20 @@ struct _kc_ethtool_pauseparam {
 #define SLE_VERSION_CODE 0
 #endif /* SLE_VERSION_CODE */
 
+/* Ubuntu release and kernel codes must be specified from Makefile */
+#ifndef UBUNTU_RELEASE_VERSION
+#define UBUNTU_RELEASE_VERSION(a,b) (((a) * 100) + (b))
+#endif
+#ifndef UBUNTU_KERNEL_VERSION
+#define UBUNTU_KERNEL_VERSION(a,b,c,abi,upload) (((a) << 40) + ((b) << 32) + ((c) << 24) + ((abi) << 8) + (upload))
+#endif
+#ifndef UBUNTU_RELEASE_CODE
+#define UBUNTU_RELEASE_CODE 0
+#endif
+#ifndef UBUNTU_KERNEL_CODE
+#define UBUNTU_KERNEL_CODE 0
+#endif
+
 #ifdef __KLOCWORK__
 #ifdef ARRAY_SIZE
 #undef ARRAY_SIZE
@@ -3847,6 +3861,7 @@ static inline struct sk_buff *__kc__vlan_hwaccel_put_tag(struct sk_buff *skb,
 
 #if ( LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0) )
 #if (!(RHEL_RELEASE_CODE && RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(7,0)))
+#if (!(UBUNTU_RELEASE_CODE == UBUNTU_RELEASE_VERSION(14,4) && UBUNTU_KERNEL_CODE >= UBUNTU_KERNEL_VERSION(3,13,0,30,54)))
 #ifdef NETIF_F_RXHASH
 #define PKT_HASH_TYPE_L3 0
 static inline void
@@ -3855,6 +3870,7 @@ skb_set_hash(struct sk_buff *skb, __u32 hash, __always_unused int type)
        skb->rxhash = hash;
 }
 #endif /* NETIF_F_RXHASH */
+#endif /* < 3.13.0-30.54 (Ubuntu 14.04) */
 #endif /* < RHEL7 */
 #endif /* < 3.14.0 */