ipcpd: added shm_pci_t to manipulate PCI in shm

Provides access to the members of the PCI for shm_du_buffs stored in
the shared memory ringbuffer.

3 files changed, 190 insertions, 0 deletions

diff --git a/src/ipcpd/CMakeLists.txt b/src/ipcpd/CMakeLists.txt
index df6ba5e1..bcb5b986 100644
--- a/src/ipcpd/CMakeLists.txt
+++ b/src/ipcpd/CMakeLists.txt
@@ -8,6 +8,7 @@ set(SOURCE_FILES
         # Add source files here
         main.c
         pci.c
+        shm_pci.c
 )
 
 add_executable (ipcpd ${SOURCE_FILES})
diff --git a/src/ipcpd/shm_pci.c b/src/ipcpd/shm_pci.c
new file mode 100644
index 00000000..d44e0e8f
--- /dev/null
+++ b/src/ipcpd/shm_pci.c
@@ -0,0 +1,146 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Protocol Control Information in Shared Memory Map
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "shm_pci.h"
+#include <malloc.h>
+#include <errno.h>
+
+#define SHM_PCI_HEAD_SIZE(a, b) a.addr_size * 2 +  \
+        a.cep_id_size * 2 +                    \
+        a.pdu_length_size +                    \
+        b.ttl_size +                           \
+        a.seqno_size +                         \
+        a.qos_id_size
+#define SHM_PCI_TAIL_SIZE(b) b.chk_size
+
+#define OUROBOROS_PREFIX "ipcpd/shm_pci"
+
+#include <ouroboros/logs.h>
+
+struct shm_pci {
+        /* head */
+        uint8_t * dst_addr;
+        uint8_t * src_addr;
+        uint8_t * dst_cep_id;
+        uint8_t * src_cep_id;
+        uint8_t * pdu_length;
+        uint8_t * ttl;
+        uint8_t * seqno;
+        uint8_t * qos_id;
+
+        uint8_t * chk;
+
+        struct shm_du_buff * dub;
+
+        struct ipcp_dtp_const dtpc;
+        struct ipcp_dup_const dupc;
+
+};
+
+shm_pci_t * shm_pci_create(struct shm_du_buff      * dub,
+                           const struct ipcp_dtp_const * dtpc,
+                           const struct ipcp_dup_const * dupc)
+{
+        struct shm_pci * p;
+
+        if (dub == NULL) {
+                LOG_DBGF("Bogus input. Bugging out.");
+                return NULL;
+        }
+
+        p = malloc(sizeof *p);
+
+        if (p == NULL)
+                return NULL;
+
+        p->dub = dub;
+
+        p->dtpc = *dtpc;
+        p->dupc = *dupc;
+
+        p->dst_addr   = NULL;
+        p->src_addr   = NULL;
+        p->dst_cep_id = NULL;
+        p->src_cep_id = NULL;
+        p->pdu_length = NULL;
+        p->ttl        = NULL;
+        p->seqno      = NULL;
+        p->qos_id     = NULL;
+        p->chk        = NULL;
+
+        return p;
+}
+
+void shm_pci_destroy(shm_pci_t * pci)
+{
+        free(pci);
+}
+
+int shm_pci_init(shm_pci_t * pci)
+{
+        if (pci == NULL) {
+                LOG_DBGF("Bogus input. Bugging out.");
+                return -EINVAL;
+        }
+
+        uint8_t * pci_head = shm_du_buff_head_alloc(
+                pci->dub, SHM_PCI_HEAD_SIZE(pci->dtpc, pci->dupc));
+        uint8_t * pci_tail = shm_du_buff_tail_alloc(
+                pci->dub, SHM_PCI_TAIL_SIZE(pci->dupc));
+
+        if (pci_head == NULL) {
+                LOG_DBG("Failed to allocate space for PCI at head.");
+                return -ENOBUFS;
+        }
+
+        if (pci_tail == NULL) {
+                LOG_DBG("Failed to allocate space for PCI at tail.");
+                return -ENOBUFS;
+        }
+
+        pci->dst_addr   = pci_head;
+        pci->src_addr   = (pci_head += pci->dtpc.addr_size);
+        pci->dst_cep_id = (pci_head += pci->dtpc.addr_size);
+        pci->src_cep_id = (pci_head += pci->dtpc.cep_id_size);
+        pci->pdu_length = (pci_head += pci->dtpc.cep_id_size);
+        pci->ttl        = (pci_head += pci->dtpc.pdu_length_size);
+        pci->seqno      = (pci_head += pci->dupc.ttl_size);
+        pci->qos_id     = (pci_head += pci->dtpc.seqno_size);
+
+        pci->chk        = (pci_tail);
+
+        return 0;
+}
+
+void shm_pci_release(shm_pci_t * pci)
+{
+        if (pci == NULL)
+                return;
+
+        if (pci->dub == NULL)
+                return;
+
+        shm_du_buff_head_release(pci->dub, SHM_PCI_HEAD_SIZE(pci->dtpc,
+                                                             pci->dupc));
+        shm_du_buff_tail_release(pci->dub, SHM_PCI_TAIL_SIZE(pci->dupc));
+}
diff --git a/src/ipcpd/shm_pci.h b/src/ipcpd/shm_pci.h
new file mode 100644
index 00000000..cb8dd5dd
--- /dev/null
+++ b/src/ipcpd/shm_pci.h
@@ -0,0 +1,43 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Protocol Control Information in Shared Memory Map
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef OUROBOROS_IPCP_SHM_PCI_H
+#define OUROBOROS_IPCP_SHM_PCI_H
+
+#include <ouroboros/shm_du_map.h>
+
+#include <dt_const.h>
+
+struct shm_pci;
+
+typedef struct shm_pci shm_pci_t;
+
+shm_pci_t * shm_pci_create(struct shm_du_buff          * dub,
+                           const struct ipcp_dtp_const * dtpc,
+                           const struct ipcp_dup_const * dupc);
+void    shm_pci_destroy(shm_pci_t * pci);
+
+int     shm_pci_init(shm_pci_t * pci);
+void    shm_pci_release(shm_pci_t * pci);
+
+#endif /* OUROBOROS_IPCP_SHM_PCI_H */