smb: smbdirect: introduce smbdirect_connection_{alloc,free}_send_io()

These are more or less copies of smb_direct_{alloc,free}_sendmsg()
in the server.

The only difference is that we use ib_dma_unmap_page() for all sges,
this simplifies the logic and doesn't matter as
ib_dma_unmap_single() and ib_dma_unmap_page() both operate
on dma_addr_t and dma_unmap_single_attrs() is just an
alias for dma_unmap_page_attrs().
We already have in inconsistency like that in the client
code where we use ib_dma_unmap_single(), while we mapped
using ib_dma_map_page().

The new functions will replace the existing once in the next commits and
will also be used in the client.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/common/smbdirect/smbdirect_connection.c b/fs/smb/common/smbdirect/smbdirect_connection.c
index 6e4b7aa2440dd4ff42bc8a1a97be3fb1ed4983a6..0b35840ad4f20827590bcd2ef86ec3bec3b66342 100644 (file)
--- a/fs/smb/common/smbdirect/smbdirect_connection.c
+++ b/fs/smb/common/smbdirect/smbdirect_connection.c
@@ -6,6 +6,53 @@
 
 #include "smbdirect_internal.h"
 
+__maybe_unused /* this is temporary while this file is included in others */
+static struct smbdirect_send_io *smbdirect_connection_alloc_send_io(struct smbdirect_socket *sc)
+{
+       struct smbdirect_send_io *msg;
+
+       msg = mempool_alloc(sc->send_io.mem.pool, sc->send_io.mem.gfp_mask);
+       if (!msg)
+               return ERR_PTR(-ENOMEM);
+       msg->socket = sc;
+       INIT_LIST_HEAD(&msg->sibling_list);
+       msg->num_sge = 0;
+
+       return msg;
+}
+
+__maybe_unused /* this is temporary while this file is included in others */
+static void smbdirect_connection_free_send_io(struct smbdirect_send_io *msg)
+{
+       struct smbdirect_socket *sc = msg->socket;
+       size_t i;
+
+       /*
+        * The list needs to be empty!
+        * The caller should take care of it.
+        */
+       WARN_ON_ONCE(!list_empty(&msg->sibling_list));
+
+       /*
+        * Note we call ib_dma_unmap_page(), even if some sges are mapped using
+        * ib_dma_map_single().
+        *
+        * The difference between _single() and _page() only matters for the
+        * ib_dma_map_*() case.
+        *
+        * For the ib_dma_unmap_*() case it does not matter as both take the
+        * dma_addr_t and dma_unmap_single_attrs() is just an alias to
+        * dma_unmap_page_attrs().
+        */
+       for (i = 0; i < msg->num_sge; i++)
+               ib_dma_unmap_page(sc->ib.dev,
+                                 msg->sge[i].addr,
+                                 msg->sge[i].length,
+                                 DMA_TO_DEVICE);
+
+       mempool_free(msg, sc->send_io.mem.pool);
+}
+
 __maybe_unused /* this is temporary while this file is included in others */
 static struct smbdirect_recv_io *smbdirect_connection_get_recv_io(struct smbdirect_socket *sc)
 {