netdev - [PATCH 10/11] samples/bpf: use hugepages in xdpsock app

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Message-Id: <20190620083924.1996-11-kevin.laatz@intel.com>
Date:   Thu, 20 Jun 2019 08:39:23 +0000
From:   Kevin Laatz <kevin.laatz@...el.com>
To:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        bjorn.topel@...el.com, magnus.karlsson@...el.com
Cc:     bpf@...r.kernel.com, intel-wired-lan@...ts.osuosl.org,
        bruce.richardson@...el.com, ciara.loftus@...el.com,
        Kevin Laatz <kevin.laatz@...el.com>
Subject: [PATCH 10/11] samples/bpf: use hugepages in xdpsock app

This patch modifies xdpsock to use mmap instead of posix_memalign. With
this change, we can use hugepages when running the application in unaligned
chunks mode. Using hugepages makes it more likely that we have physically
contiguous memory, which supports the unaligned chunk mode better.

Signed-off-by: Kevin Laatz <kevin.laatz@...el.com>
---
 samples/bpf/xdpsock_user.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 7b4ce047deb2..8ed63ad68428 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -74,6 +74,7 @@ static int opt_interval = 1;
 static u64 opt_buffer_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
 static u32 opt_umem_flags;
 static int opt_unaligned_chunks;
+static int opt_mmap_flags;
 static u32 opt_xdp_bind_flags;
 static __u32 prog_id;
 
@@ -438,6 +439,7 @@ static void parse_command_line(int argc, char **argv)
 		case 'u':
 			opt_umem_flags |= XDP_UMEM_UNALIGNED_CHUNKS;
 			opt_unaligned_chunks = 1;
+			opt_mmap_flags = MAP_HUGETLB;
 			break;
 		case 'b':
 			opt_buffer_size = atoi(optarg);
@@ -707,11 +709,13 @@ int main(int argc, char **argv)
 		exit(EXIT_FAILURE);
 	}
 
-	ret = posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */
-			     NUM_FRAMES * opt_buffer_size);
-	if (ret)
-		exit_with_error(ret);
-
+	/* Reserve memory for the umem. Use hugepages if unaligned chunk mode */
+	bufs = mmap(NULL, NUM_FRAMES * opt_buffer_size, PROT_READ|PROT_WRITE,
+			MAP_PRIVATE|MAP_ANONYMOUS|opt_mmap_flags, -1, 0);
+	if (bufs == MAP_FAILED) {
+		printf("ERROR: mmap failed\n");
+		exit(EXIT_FAILURE);
+	}
        /* Create sockets... */
 	umem = xsk_configure_umem(bufs,
 				  NUM_FRAMES * opt_buffer_size);
-- 
2.17.1