MINOR: stconn: Add SE flag to announce zero-copy forwarding on consumer side

The SE_FL_MAY_FASTFWD_CONS is added and it will be used by endpoints to
announce their support for the zero-copy forwarding on the consumer
side. The flag is not necessarily permanent. However, it will be used this
way for now.

diff --git a/include/haproxy/stconn-t.h b/include/haproxy/stconn-t.h
index d75ae443ccb397523783801b4ccf93ac86b9c8d9..ee1cdd423b4c1e8fc59e8da3a0f08571c557d155 100644 (file)
--- a/include/haproxy/stconn-t.h
+++ b/include/haproxy/stconn-t.h
@@ -97,12 +97,12 @@ enum se_flags {
        SE_FL_WANT_ROOM  = 0x00080000,  /* More bytes to transfer, but not enough room */
        SE_FL_EXP_NO_DATA= 0x00100000,  /* No data expected by the endpoint */
        SE_FL_MAY_FASTFWD_PROD = 0x00200000, /* The endpoint may produce data via zero-copy forwarding */
-       SE_FL_ENDP_MASK  = 0x002ff000,  /* Mask for flags set by the endpoint */
+       SE_FL_MAY_FASTFWD_CONS = 0x00400000, /* The endpoint may consume data via zero-copy forwarding */
+       SE_FL_ENDP_MASK  = 0x004ff000,  /* Mask for flags set by the endpoint */
 
        /* following flags are supposed to be set by the app layer and read by
         * the endpoint :
         */
-       /* unused             0x00400000,*/
        /* unused             0x00800000,*/
        /* unused             0x01000000,*/
        /* unused             0x02000000,*/
@@ -128,9 +128,9 @@ static forceinline char *se_show_flags(char *buf, size_t len, const char *delim,
        _(SE_FL_SHRD, _(SE_FL_SHRR, _(SE_FL_SHWN, _(SE_FL_SHWS,
        _(SE_FL_NOT_FIRST, _(SE_FL_WEBSOCKET, _(SE_FL_EOI, _(SE_FL_EOS,
        _(SE_FL_ERROR, _(SE_FL_ERR_PENDING,  _(SE_FL_RCV_MORE,
-       _(SE_FL_WANT_ROOM, _(SE_FL_EXP_NO_DATA, _(SE_FL_MAY_FASTFWD_PROD,
+       _(SE_FL_WANT_ROOM, _(SE_FL_EXP_NO_DATA, _(SE_FL_MAY_FASTFWD_PROD, _(SE_FL_MAY_FASTFWD_CONS,
        _(SE_FL_WAIT_FOR_HS, _(SE_FL_KILL_CONN, _(SE_FL_WAIT_DATA,
-       _(SE_FL_WONT_CONSUME, _(SE_FL_HAVE_NO_DATA, _(SE_FL_APPLET_NEED_CONN))))))))))))))))))))))));
+       _(SE_FL_WONT_CONSUME, _(SE_FL_HAVE_NO_DATA, _(SE_FL_APPLET_NEED_CONN)))))))))))))))))))))))));
        /* epilogue */
        _(~0U);
        return buf;