diff options
Diffstat (limited to 'src/rlc.h')
| -rw-r--r-- | src/rlc.h | 404 |
1 files changed, 4 insertions, 400 deletions
@@ -12,10 +12,6 @@ * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #pragma once #ifdef __cplusplus @@ -33,34 +29,10 @@ extern "C" { #include <string.h> #define RLC_GPRS_SNS 128 /* GPRS, must be power of 2 */ -#define RLC_GPRS_WS 64 /* max window size */ -#define RLC_EGPRS_MIN_WS 64 /* min window size */ -#define RLC_EGPRS_MAX_WS 1024 /* min window size */ #define RLC_EGPRS_SNS 2048 /* EGPRS, must be power of 2 */ -#define RLC_EGPRS_MAX_BSN_DELTA 512 #define RLC_MAX_SNS RLC_EGPRS_SNS -#define RLC_MAX_WS RLC_EGPRS_MAX_WS #define RLC_MAX_LEN 74 /* MCS-9 data unit */ -struct gprs_rlcmac_bts; - -/* The state of a BSN in the send/receive window */ -enum gprs_rlc_ul_bsn_state { - GPRS_RLC_UL_BSN_INVALID, - GPRS_RLC_UL_BSN_RECEIVED, - GPRS_RLC_UL_BSN_MISSING, - GPRS_RLC_UL_BSN_MAX, -}; - -enum gprs_rlc_dl_bsn_state { - GPRS_RLC_DL_BSN_INVALID, - GPRS_RLC_DL_BSN_NACKED, - GPRS_RLC_DL_BSN_ACKED, - GPRS_RLC_DL_BSN_UNACKED, - GPRS_RLC_DL_BSN_RESEND, - GPRS_RLC_DL_BSN_MAX, -}; - /* * EGPRS resegment status information for UL * When only first split block is received bsn state @@ -243,138 +215,6 @@ struct gprs_rlc { gprs_rlc_data m_blocks[RLC_MAX_SNS/2]; }; -/** - * TODO: for GPRS/EDGE maybe make sns a template parameter - * so we create specialized versions... - */ -struct gprs_rlc_v_b { - /* Check for an individual frame */ - bool is_unacked(int bsn) const; - bool is_nacked(int bsn) const; - bool is_acked(int bsn) const; - bool is_resend(int bsn) const; - bool is_invalid(int bsn) const; - gprs_rlc_dl_bsn_state get_state(int bsn) const; - - /* Mark a RLC frame for something */ - void mark_unacked(int bsn); - void mark_nacked(int bsn); - void mark_acked(int bsn); - void mark_resend(int bsn); - void mark_invalid(int bsn); - - void reset(); - - -private: - bool is_state(int bsn, const gprs_rlc_dl_bsn_state state) const; - void mark(int bsn, const gprs_rlc_dl_bsn_state state); - - gprs_rlc_dl_bsn_state m_v_b[RLC_MAX_SNS/2]; /* acknowledge state array */ -}; - - -/** - * TODO: The UL/DL code could/should share a base class. - */ -class gprs_rlc_window { -public: - gprs_rlc_window(); - - const uint16_t mod_sns() const; - const uint16_t mod_sns(uint16_t bsn) const; - const uint16_t sns() const; - const uint16_t ws() const; - - void set_sns(uint16_t sns); - void set_ws(uint16_t ws); - -protected: - uint16_t m_sns; - uint16_t m_ws; -}; - -struct gprs_rlc_dl_window: public gprs_rlc_window { - void reset(); - - bool window_stalled() const; - bool window_empty() const; - - void increment_send(); - void raise(int moves); - - const uint16_t v_s() const; - const uint16_t v_s_mod(int offset) const; - const uint16_t v_a() const; - const uint16_t distance() const; - - /* Methods to manage reception */ - int resend_needed() const; - int mark_for_resend(); - void update(struct gprs_rlcmac_bts *bts, char *show_rbb, uint16_t ssn, - uint16_t *lost, uint16_t *received); - void update(struct gprs_rlcmac_bts *bts, const struct bitvec *rbb, - uint16_t first_bsn, uint16_t *lost, - uint16_t *received); - int move_window(); - void show_state(char *show_rbb); - int count_unacked(); - - uint16_t m_v_s; /* send state */ - uint16_t m_v_a; /* ack state */ - - gprs_rlc_v_b m_v_b; - - gprs_rlc_dl_window(); -}; - -struct gprs_rlc_v_n { - void reset(); - - void mark_received(int bsn); - void mark_missing(int bsn); - - bool is_received(int bsn) const; - - gprs_rlc_ul_bsn_state state(int bsn) const; -private: - bool is_state(int bsn, const gprs_rlc_ul_bsn_state state) const; - void mark(int bsn, const gprs_rlc_ul_bsn_state state); - gprs_rlc_ul_bsn_state m_v_n[RLC_MAX_SNS/2]; /* receive state array */ -}; - -struct gprs_rlc_ul_window: public gprs_rlc_window { - const uint16_t v_r() const; - const uint16_t v_q() const; - - const void set_v_r(int); - const void set_v_q(int); - void reset_state(); - - const uint16_t ssn() const; - - bool is_in_window(uint16_t bsn) const; - bool is_received(uint16_t bsn) const; - - void update_rbb(char *rbb); - uint16_t update_egprs_rbb(uint8_t *rbb); - void raise_v_r_to(int moves); - void raise_v_r(const uint16_t bsn); - uint16_t raise_v_q(); - - void raise_v_q(int); - - void receive_bsn(const uint16_t bsn); - bool invalidate_bsn(const uint16_t bsn); - - uint16_t m_v_r; /* receive state */ - uint16_t m_v_q; /* receive window state */ - - gprs_rlc_v_n m_v_n; - - gprs_rlc_ul_window(); -}; - extern "C" { /* TS 44.060 10.2.2 */ struct rlc_ul_header { @@ -390,7 +230,7 @@ struct rlc_ul_header { uint8_t e:1, bsn:7; #elif OSMO_IS_BIG_ENDIAN -/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */ +/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianness.py) */ uint8_t pt:2, cv:4, si:1, r:1; uint8_t spare:1, pi:1, tfi:5, ti:1; uint8_t bsn:7, e:1; @@ -409,7 +249,7 @@ struct rlc_dl_header { uint8_t e:1, bsn:7; #elif OSMO_IS_BIG_ENDIAN -/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */ +/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianness.py) */ uint8_t pt:2, rrbp:2, s_p:1, usf:3; uint8_t pr:2, tfi:5, fbi:1; uint8_t bsn:7, e:1; @@ -422,7 +262,7 @@ struct rlc_li_field { m:1, li:6; #elif OSMO_IS_BIG_ENDIAN -/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */ +/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianness.py) */ uint8_t li:6, m:1, e:1; #endif } __attribute__ ((packed)); @@ -432,248 +272,12 @@ struct rlc_li_field_egprs { uint8_t e:1, li:7; #elif OSMO_IS_BIG_ENDIAN -/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */ +/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianness.py) */ uint8_t li:7, e:1; #endif } __attribute__ ((packed)); } -inline bool gprs_rlc_v_b::is_state(int bsn, const gprs_rlc_dl_bsn_state type) const -{ - return m_v_b[bsn & mod_sns_half()] == type; -} - -inline void gprs_rlc_v_b::mark(int bsn, const gprs_rlc_dl_bsn_state type) -{ - m_v_b[bsn & mod_sns_half()] = type; -} - -inline bool gprs_rlc_v_b::is_nacked(int bsn) const -{ - return is_state(bsn, GPRS_RLC_DL_BSN_NACKED); -} - -inline bool gprs_rlc_v_b::is_acked(int bsn) const -{ - return is_state(bsn, GPRS_RLC_DL_BSN_ACKED); -} - -inline bool gprs_rlc_v_b::is_unacked(int bsn) const -{ - return is_state(bsn, GPRS_RLC_DL_BSN_UNACKED); -} - -inline bool gprs_rlc_v_b::is_resend(int bsn) const -{ - return is_state(bsn, GPRS_RLC_DL_BSN_RESEND); -} - -inline bool gprs_rlc_v_b::is_invalid(int bsn) const -{ - return is_state(bsn, GPRS_RLC_DL_BSN_INVALID); -} - -inline gprs_rlc_dl_bsn_state gprs_rlc_v_b::get_state(int bsn) const -{ - return m_v_b[bsn & mod_sns_half()]; -} - -inline void gprs_rlc_v_b::mark_resend(int bsn) -{ - return mark(bsn, GPRS_RLC_DL_BSN_RESEND); -} - -inline void gprs_rlc_v_b::mark_unacked(int bsn) -{ - return mark(bsn, GPRS_RLC_DL_BSN_UNACKED); -} - -inline void gprs_rlc_v_b::mark_acked(int bsn) -{ - return mark(bsn, GPRS_RLC_DL_BSN_ACKED); -} - -inline void gprs_rlc_v_b::mark_nacked(int bsn) -{ - return mark(bsn, GPRS_RLC_DL_BSN_NACKED); -} - -inline void gprs_rlc_v_b::mark_invalid(int bsn) -{ - return mark(bsn, GPRS_RLC_DL_BSN_INVALID); -} - -inline gprs_rlc_window::gprs_rlc_window() - : m_sns(RLC_GPRS_SNS) - , m_ws(RLC_GPRS_WS) -{ -} - -inline const uint16_t gprs_rlc_window::sns() const -{ - return m_sns; -} - -inline const uint16_t gprs_rlc_window::ws() const -{ - return m_ws; -} - -inline const uint16_t gprs_rlc_window::mod_sns() const -{ - return sns() - 1; -} - -inline const uint16_t gprs_rlc_window::mod_sns(uint16_t bsn) const -{ - return bsn & mod_sns(); -} - -inline gprs_rlc_dl_window::gprs_rlc_dl_window() - : m_v_s(0) - , m_v_a(0) -{ - reset(); -} - -inline const uint16_t gprs_rlc_dl_window::v_s() const -{ - return m_v_s; -} - -inline const uint16_t gprs_rlc_dl_window::v_s_mod(int offset) const -{ - return mod_sns(m_v_s + offset); -} - -inline const uint16_t gprs_rlc_dl_window::v_a() const -{ - return m_v_a; -} - -inline bool gprs_rlc_dl_window::window_stalled() const -{ - return (mod_sns(m_v_s - m_v_a)) == ws(); -} - -inline bool gprs_rlc_dl_window::window_empty() const -{ - return m_v_s == m_v_a; -} - -inline void gprs_rlc_dl_window::increment_send() -{ - m_v_s = (m_v_s + 1) & mod_sns(); -} - -inline void gprs_rlc_dl_window::raise(int moves) -{ - m_v_a = (m_v_a + moves) & mod_sns(); -} - -inline const uint16_t gprs_rlc_dl_window::distance() const -{ - return (m_v_s - m_v_a) & mod_sns(); -} - -inline gprs_rlc_ul_window::gprs_rlc_ul_window() - : m_v_r(0) - , m_v_q(0) -{ - m_v_n.reset(); -} - -inline bool gprs_rlc_ul_window::is_in_window(uint16_t bsn) const -{ - uint16_t offset_v_q; - - /* current block relative to lowest unreceived block */ - offset_v_q = (bsn - m_v_q) & mod_sns(); - /* If out of window (may happen if blocks below V(Q) are received - * again. */ - return offset_v_q < ws(); -} - -inline bool gprs_rlc_ul_window::is_received(uint16_t bsn) const -{ - uint16_t offset_v_r; - - /* Offset to the end of the received window */ - offset_v_r = (m_v_r - 1 - bsn) & mod_sns(); - return is_in_window(bsn) && m_v_n.is_received(bsn) && offset_v_r < ws(); -} - -inline void gprs_rlc_ul_window::reset_state() -{ - m_v_r = 0; - m_v_q = 0; -} - -inline const void gprs_rlc_ul_window::set_v_r(int v_r) -{ - m_v_r = v_r; -} - -inline const void gprs_rlc_ul_window::set_v_q(int v_q) -{ - m_v_q = v_q; -} - -inline const uint16_t gprs_rlc_ul_window::v_r() const -{ - return m_v_r; -} - -inline const uint16_t gprs_rlc_ul_window::v_q() const -{ - return m_v_q; -} - -inline const uint16_t gprs_rlc_ul_window::ssn() const -{ - return m_v_r; -} - -inline void gprs_rlc_ul_window::raise_v_r_to(int moves) -{ - m_v_r = mod_sns(m_v_r + moves); -} - -inline void gprs_rlc_ul_window::raise_v_q(int incr) -{ - m_v_q = mod_sns(m_v_q + incr); -} - -inline void gprs_rlc_v_n::mark_received(int bsn) -{ - return mark(bsn, GPRS_RLC_UL_BSN_RECEIVED); -} - -inline void gprs_rlc_v_n::mark_missing(int bsn) -{ - return mark(bsn, GPRS_RLC_UL_BSN_MISSING); -} - -inline bool gprs_rlc_v_n::is_received(int bsn) const -{ - return is_state(bsn, GPRS_RLC_UL_BSN_RECEIVED); -} - -inline bool gprs_rlc_v_n::is_state(int bsn, gprs_rlc_ul_bsn_state type) const -{ - return m_v_n[bsn & mod_sns_half()] == type; -} - -inline void gprs_rlc_v_n::mark(int bsn, gprs_rlc_ul_bsn_state type) -{ - m_v_n[bsn & mod_sns_half()] = type; -} - -inline gprs_rlc_ul_bsn_state gprs_rlc_v_n::state(int bsn) const -{ - return m_v_n[bsn & mod_sns_half()]; -} - inline void gprs_rlc::init() { memset(m_blocks, 0, sizeof(m_blocks)); |