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linux: Report supported user features to the kernel

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Following commit (''netlink: Do not enforce alignment of last Netlink
attribute''), signal the ability to receive unaligned Netlink messages
to the datapath to enable utilization of zerocopy optimizations.

Opening a datapath is now done by issueing a OVS_DP_CMD_SET in order
to overwrite previously set user features.

Signed-off-by: Thomas Graf <tgraf@redhat.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Thomas Graf
2013-12-19 16:20:42 +01:00
committed by Jesse Gross
parent 09daa5dfe6
commit b7fd5e3841
1 changed files with 8 additions and 1 deletions
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9
lib/dpif-linux.c
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@@ -73,6 +73,7 @@ struct dpif_linux_dp {
/* Attributes. */
const char *name; /* OVS_DP_ATTR_NAME. */
const uint32_t *upcall_pid; /* OVS_DP_ATTR_UPCALL_PID. */
uint32_t user_features; /* OVS_DP_ATTR_USER_FEATURES */
struct ovs_dp_stats stats; /* OVS_DP_ATTR_STATS. */
struct ovs_dp_megaflow_stats megaflow_stats;
/* OVS_DP_ATTR_MEGAFLOW_STATS.*/
@@ -231,9 +232,11 @@ dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
upcall_pid = 0;
dp_request.upcall_pid = &upcall_pid;
} else {
dp_request.cmd = OVS_DP_CMD_GET;
/* Use OVS_DP_CMD_SET to report user features */
dp_request.cmd = OVS_DP_CMD_SET;
}
dp_request.name = name;
dp_request.user_features |= OVS_DP_F_UNALIGNED;
error = dpif_linux_dp_transact(&dp_request, &dp, &buf);
if (error) {
return error;
@@ -1931,6 +1934,10 @@ dpif_linux_dp_to_ofpbuf(const struct dpif_linux_dp *dp, struct ofpbuf *buf)
nl_msg_put_u32(buf, OVS_DP_ATTR_UPCALL_PID, *dp->upcall_pid);
}
if (dp->user_features) {
nl_msg_put_u32(buf, OVS_DP_ATTR_USER_FEATURES, dp->user_features);
}
/* Skip OVS_DP_ATTR_STATS since we never have a reason to serialize it. */
}