...and this for libmlx4?
diff --git a/src/mlx4.h b/src/mlx4.h
index c4d389f..1e92b88 100644
--- a/src/mlx4.h
+++ b/src/mlx4.h
@@ -65,6 +65,20 @@
# define wmb() mb()
#endif
+#ifndef wc_wmb
+
+#if defined(__i386__)
+#define wc_wmb() asm volatile("lock; addl $0,0(%%esp) " ::: "memory")
+#elif defined(__x86_64__)
+#define wc_wmb() asm volatile("sfence" ::: "memory")
+#elif defined(__ia64__)
+#define wc_wmb() asm volatile("fwb" ::: "memory")
+#else
+#define wc_wmb() wmb()
+#endif
+
+#endif
+
#define HIDDEN __attribute__((visibility ("hidden")))
#define PFX "mlx4: "
diff --git a/src/qp.c b/src/qp.c
index a70e5f2..a4384f9 100644
--- a/src/qp.c
+++ b/src/qp.c
@@ -282,9 +282,12 @@ out:
++qp->sq.head;
pthread_spin_lock(&ctx->bf_lock);
+
memcpy(ctx->bf_page + ctx->bf_offset, ctrl, align(size * 16,
64));
- /* FIXME flush wc buffers */
+ wc_wmb();
+
ctx->bf_offset ^= ctx->bf_buf_size;
+
pthread_spin_unlock(&ctx->bf_lock);
} else if (nreq) {
qp->sq.head += nreq;
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