diff options
Diffstat (limited to 'qemu/roms/SLOF/lib/libvirtio/p9.c')
| -rw-r--r-- | qemu/roms/SLOF/lib/libvirtio/p9.c | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/qemu/roms/SLOF/lib/libvirtio/p9.c b/qemu/roms/SLOF/lib/libvirtio/p9.c new file mode 100644 index 000000000..a55662994 --- /dev/null +++ b/qemu/roms/SLOF/lib/libvirtio/p9.c @@ -0,0 +1,575 @@ +/****************************************************************************** + * Copyright (c) 2011 IBM Corporation + * All rights reserved. + * This program and the accompanying materials + * are made available under the terms of the BSD License + * which accompanies this distribution, and is available at + * http://www.opensource.org/licenses/bsd-license.php + * + * Contributors: + * IBM Corporation - initial implementation + *****************************************************************************/ + +#include <stdio.h> +#include <stdint.h> +#include <string.h> +#include <byteorder.h> +#include "p9.h" + + +/* Protocol stack marshaling. */ +uint8_t *sp; + +#define GET_08(s,i) (s)[(i)] +#define GET_16(s,i) le16_to_cpu(*(uint16_t*)(&(s)[(i)])) +#define GET_32(s,i) le32_to_cpu(*(uint32_t*)(&(s)[(i)])) +#define GET_64(s,i) le64_to_cpu(*(uint64_t*)(&(s)[(i)])) + +#define SET_08(s,i,v) (s)[(i)] = (v) +#define SET_16(s,i,v) *(uint16_t*)(&(s)[(i)]) = cpu_to_le16(v) +#define SET_32(s,i,v) *(uint32_t*)(&(s)[(i)]) = cpu_to_le32(v) +#define SET_64(s,i,v) *(uint64_t*)(&(s)[(i)]) = cpu_to_le64(v) + +#define PUT_08(v) sp[0] = (v);sp+=1 +#define PUT_16(v) *(uint16_t*)(&sp[0]) = cpu_to_le16(v);sp+=2 +#define PUT_32(v) *(uint32_t*)(&sp[0]) = cpu_to_le32(v);sp+=4 +#define PUT_64(v) *(uint64_t*)(&sp[0]) = cpu_to_le64(v);sp+=8 + +#define PUT_HD(m,t) PUT_32(0);PUT_08(m);PUT_16(t) +#define PUT_SN(v,n) PUT_16(n);memcpy(sp,(v),(n));sp+=n +#define PUT_ST(v) PUT_16(strlen(v));memcpy(sp,(v),strlen(v));\ + sp+=strlen(v) + +#define GET_SIZE (sp - tx) + + +/* General defines. */ +#define MIN(a,b) ((a)>(b)?(b):(a)) + +#define NOTAG ((uint16_t)~0) +#define NOFID ((uint32_t)~0) +#define TAG 1 +#define BUF_SIZE (8*1024) + +#define VERSION "9P2000.u" +#define UNKNOWN_VER "unknown" + +#define MSG_SIZE 0 +#define MSG_ID 4 +#define MSG_ERR 0x6b +#define MSG_ERR_STR 9 +#define MSG_ERR_STR_LEN 7 +#define MSG_TAG 5 +#define MSG_VER_MSIZE 7 +#define MSG_VER_STR_LEN 11 +#define MSG_VER_STR 13 +#define MSG_WALK_TX_ELMT 15 +#define MSG_WALK_RX_ELMT 7 +#define MSG_SIZE 0 +#define MSG_WALK_MAX_ELMT 16 +#define MSG_QID_SIZE 13 +#define MSG_WALK_RX_HDR_SIZE 9 +#define MSG_OPEN_IOUNIT 20 +#define MSG_OPEN_MODE_MASK 0x5f +#define MSG_READ_COUNT 7 +#define MSG_READ_DATA 11 +#define MSG_STAT_LEN 42 +#define MSG_STAT_TYPE 17 + +#define T_VERSION 100 +#define R_VERSION (T_VERSION + 1) +#define T_ATTACH 104 +#define R_ATTACH (T_ATTACH + 1) +#define T_ERROR 106 +#define R_ERROR (T_ERROR + 1) +#define T_WALK 110 +#define R_WALK (T_WALK + 1) +#define T_OPEN 112 +#define R_OPEN (T_OPEN + 1) +#define T_READ 116 +#define R_READ (T_READ + 1) +#define T_CLUNK 120 +#define R_CLUNK (T_CLUNK + 1) +#define T_STAT 124 +#define R_STAT (T_STAT + 1) + +static p9_transact_t transact; +static void *transact_opaque; +static uint8_t *tx; +static uint8_t *rx; + + +/** + * p9_reg_transport + * + * Registers a transport function for use by the P9 protocol. The transport + * connects the P9 Client (this library) to a server instance. + * + * @param transact_func[in] Function pointer to type p9_transact_t. + * @param tx_buffer[in] TX buffer, must be 8k in size. + * @param rx_buffer[in] RX buffer, must be 8k in size. + */ +void p9_reg_transport(p9_transact_t transact_func, void *opaque, + uint8_t *tx_buffer, uint8_t *rx_buffer) +{ + transact = transact_func; + transact_opaque = opaque; + tx = tx_buffer; + rx = rx_buffer; +} + +/** + * reset_buffers + * + * Reset the RX and TX buffers to BUF_SIZE (8k) and reset the Stack Pointer + * for the TX buffer, which is referenced by the PUT_* macro's. + */ +void reset_buffers(void) +{ + memset(tx, 0, BUF_SIZE); + memset(rx, 0, BUF_SIZE); + sp = tx; +} + +/** + * p9_transaction + * + * Perform a transaction (send/recv) over the registered transport. + * + * @param connection[in|out] Connection object. + * @return 0 = success, -ve = error. + */ +int p9_transaction(p9_connection_t *connection) +{ + int rc; + int tx_size = GET_SIZE; + int rx_size = connection->message_size; + + if (transact == NULL) { + return P9_NO_TRANSPORT; + } + if (tx == NULL || rx == NULL) { + return P9_NO_BUFFER; + } + if (connection->message_size > BUF_SIZE) { + return P9_MSG_SIZE_TOO_BIG; + } + if (tx_size > connection->message_size) { + return P9_MSG_TOO_LONG; + } + + SET_32(tx, MSG_SIZE, tx_size); + rc = transact(transact_opaque, tx, tx_size, rx, &rx_size); + + if (rc != 0) { + return P9_TRANSPORT_ERROR; + } + if (GET_16(tx, MSG_TAG) != GET_16(rx, MSG_TAG)) { + return P9_UNEXPECTED_TAG; + } + if (GET_08(rx, MSG_ID) == MSG_ERR) { + char error_string[200]; + + memset(error_string, 0, 200); + strncpy(error_string, (char *)&rx[MSG_ERR_STR], + MIN(200 - 1, GET_16(rx, MSG_ERR_STR_LEN))); +#ifndef TEST + printf("\nError: %s\n", error_string); +#endif + return P9_R_ERROR; + } + if ((GET_08(tx, MSG_ID) + 1) != GET_08(rx, MSG_ID)) { + return P9_UNEXPECTED_MSG; + } + + return 0; +} + +/** + * p9_version + * + * Called to start a session. Negotiates the maximum message size for the + * P9 protocol. + * + * @param connection[in|out] Connection object, contains message_size. + * @return 0 = success, -ve = error. + * + * @remark + * size[4] Tversion tag[2] msize[4] version[s] + * size[4] Rversion tag[2] msize[4] version[s] + */ +int p9_version(p9_connection_t *connection) +{ + int rc; + char *ver_str; + int ver_len; + + reset_buffers(); + + /* Build message. */ + PUT_HD(T_VERSION, NOTAG); + PUT_32(connection->message_size); + PUT_ST(VERSION); + + /* Send message. */ + rc = p9_transaction(connection); + if (rc != 0) { + return rc; + } + + /* Handle response. */ + connection->message_size = MIN(connection->message_size, + GET_32(rx, MSG_VER_MSIZE)); + + ver_str = (char *)&rx[MSG_VER_STR]; + ver_len = GET_16(rx, MSG_VER_STR_LEN); + if (strncmp(UNKNOWN_VER, ver_str, ver_len) == 0) { + return P9_UNKNOWN_VERSION; + } + + + return 0; +} + +/** + * p9_attach + * + * Called to open a connection for a user to a file tree on the server. There + * is no authorisation undertaken (NOFID). + * + * @param connection[in|out] Connection object, contains uname and aname as + * well as the connection fid and returned qid. + * @return 0 = success, -ve = error. + * + * @remark + * size[4] Tattach tag[2] fid[4] afid[4] uname[s] aname[s] n_uname[4] + * size[4] Rattach tag[2] qid[13] + */ +int p9_attach(p9_connection_t *connection) +{ + int rc; + int length = 19 + strlen(connection->uname) + strlen(connection->aname); + + if (length > connection->message_size) { + return P9_MSG_TOO_LONG; + } + + reset_buffers(); + + /* Build message. */ + PUT_HD(T_ATTACH, TAG); + PUT_32(connection->fid); + PUT_32(NOFID); + PUT_ST(connection->uname); + PUT_ST(connection->aname); + PUT_32(~0); /* ??? */ + + /* Send message. */ + rc = p9_transaction(connection); + if (rc != 0) { + return rc; + } + + + return 0; +} + +/** + * p9_clunk + * + * Called when closing a file or connection (or after failed opens). Tells the + * server that the supplied fid is no longer needed by this client. + * + * @param connection[in|out] Connection object. + * @param fid[in] Fid to be clunked (released) on the server. + * @return 0 = success, -ve = error. + * + * @remark + * size[4] Tclunk tag[2] fid[4] + * size[4] Rclunk tag[2] + */ +int p9_clunk(p9_connection_t *connection, uint32_t fid) +{ + int rc; + + reset_buffers(); + + /* Build message. */ + PUT_HD(T_CLUNK, TAG); + PUT_32(fid); + + /* Send message. */ + rc = p9_transaction(connection); + if (rc != 0) { + return rc; + } + + + return 0; +} + +/** + * p9_walk + * + * Walk the provided path to a file (or directory) starting at the directory + * indicated by fid and assigning new_fid to the last successfully walked + * element. If not all elements of the path can be walked then the pos + * pointer is set to the part of the path following the last successful + * walked element. The function can be called again to walk the remainder + * of the path (or produce an error). + * + * @param connection[in] Connection object. + * @param fid[in] Fid to start walk from, must be directory or root (from + * call to p9_attach). + * @param new_fid[in] Fid to be used for the last walked element. + * @param pos[in|out] Position in path that remains to be walked. If the + * path was completely walked without error this will point to the NULL + * at the end of path. + * @return 1 = partial walk, 0 = success, -ve = error. + * + * @remark + * size[4] Twalk tag[2] fid[4] newfid[4] nwname[2] nwname*(wname[s]) + * size[4] Rwalk tag[2] nwqid[2] nwqid*(qid[13]) + */ +int p9_walk(p9_connection_t *connection, uint32_t fid, uint32_t new_fid, + uint8_t **pos) +{ + int rc; + const char *path = (const char *)*pos; + uint8_t *s_tok; + uint8_t *e_tok; + int element_count = 0; + + if (path == NULL) { + *pos = NULL; + return P9_NULL_PATH; + } + + reset_buffers(); + + /* Build message. */ + PUT_HD(T_WALK, TAG); /* Length to 0, set later. */ + PUT_32(fid); + PUT_32(new_fid); + PUT_16(0); /* Element count to 0, set later. */ + + /* Get elements from path, and append to message. */ + s_tok = (uint8_t *)path; + e_tok = s_tok; + + while (*s_tok != 0) { + while (*s_tok == '/') { + s_tok++; + } + e_tok = s_tok; + while ((*e_tok != '/') && (*e_tok != 0)) { + e_tok++; + } + + /* Check the element is OK. */ + if (strncmp(".", (const char *)s_tok, (e_tok - s_tok)) == 0) { + /* Don't send ".", continue to next. */ + s_tok = e_tok; + continue; + } + int tx_size = (e_tok - s_tok + 2 + GET_SIZE); + int rx_size = ((element_count + 1) * MSG_QID_SIZE + + MSG_WALK_RX_HDR_SIZE); + if ((tx_size > connection->message_size) + || (rx_size > connection->message_size)) { + /* + * Element makes TX msg too long OR expected RX msg + * too long. Move pos to previous element and do + * partial walk. + */ + e_tok = s_tok; + if (*(e_tok - 1) == '/') { + e_tok--; + } + break; + } + + /* Add the element to the message. */ + PUT_SN(s_tok, e_tok - s_tok); + element_count++; + + /* Server supports no more than 16 elements, partial walk. */ + if (element_count == MSG_WALK_MAX_ELMT) { + break; + } + + /* Ready to find the next element. */ + s_tok = e_tok; + } + + if ((element_count == 0) && (strlen(path) > 0)) { + return P9_PATH_ELEMENT_TOO_LONG; + } + + *pos = e_tok; + + /* Update counts and then send message. */ + SET_16(tx, MSG_WALK_TX_ELMT, element_count); + rc = p9_transaction(connection); + if (rc != 0) { + return rc; + } + + /* Check for special return conditions. */ + if (element_count != GET_16(rx, MSG_WALK_RX_ELMT)) { + /* Find the last element successfully walked */ + s_tok = (uint8_t *)path; + e_tok = s_tok; + element_count = GET_16(rx, MSG_WALK_RX_ELMT); + + while (element_count--) { + while (*s_tok == '/') { + s_tok++; + } + + e_tok = s_tok; + + while ((*e_tok != '/') && (*e_tok != 0)) { + e_tok++; + } + + s_tok = e_tok; + } + + *pos = e_tok; + } + if (**pos != 0) { + rc = P9_PARTIAL_WALK; + } + + + return rc; +} + +/** + * p9_open + * + * Opens the file represented by fid with associated mode bit mask. The iounit + * size returned from the server is written to the connection object. + * + * @param file[in|out] File object, contains fid for file. + * @param mode[in] Mode to open with. Bit's 0=R, 1=W, 2=RW, 3=EX, 4=Trunc + * and 6=Delete on Close. + * @return 0 = success, -ve = error. + * + * @remark + * size[4] Topen tag[2] fid[4] mode[1] + * size[4] Ropen tag[2] qid[13] iounit[4] + */ +int p9_open(p9_file_t *file, uint8_t mode) +{ + int rc; + p9_connection_t *connection = file->connection; + + reset_buffers(); + file->iounit = 0; + + /* Build message. */ + PUT_HD(T_OPEN, TAG); + PUT_32(file->fid); + PUT_08(mode & MSG_OPEN_MODE_MASK); + + /* Send message. */ + rc = p9_transaction(connection); + if (rc != 0) { + return rc; + } + + /* Handle response. */ + file->iounit = GET_32(rx, MSG_OPEN_IOUNIT); + + + return 0; +} + +/** + * p9_read + * + * Reads the file in to buffer. + * + * @param file[in] File object, contains fid for file. + * @param buffer[out] Buffer for data. + * @param count[in] Number of bytes to read (less bytes than requested + * may be read). + * @param offset[in] Offset in file to read from. + * @return Bytes read, -ve = error. + * + * @remark + * size[4] Tread tag[2] fid[4] offset[8] count[4] + * size[4] Rread tag[2] count[4] data[count] + */ +int p9_read(p9_file_t *file, uint8_t *buffer, + uint32_t count, uint64_t offset) +{ + int rc; + p9_connection_t *connection = file->connection; + uint32_t got; + + reset_buffers(); + count = MIN((connection->message_size - MSG_READ_DATA), count); + + /* Build message. */ + PUT_HD(T_READ, TAG); + PUT_32(file->fid); + PUT_64(offset); + PUT_32(count); + + /* Send message. */ + rc = p9_transaction(connection); + if (rc != 0) { + return rc; + } + got = GET_32(rx, MSG_READ_COUNT); + if (got > count) { + return P9_READ_UNEXPECTED_DATA; + } + + /* Handle response. */ + memcpy(buffer, &rx[MSG_READ_DATA], got); + + return got; +} + +/** + * p9_stat + * + * Stat's the fid and writes the type and length to the file object. + * + * @param file[in|out] File object, contains fid for file. + * @return 0 = success, -ve = error. + * + * @remark + * size[4] Tstat tag[2] fid[4] + * size[4] Rstat tag[2] size[2] stat[n] + */ +int p9_stat(p9_file_t *file) +{ + int rc; + p9_connection_t *connection = file->connection; + + reset_buffers(); + file->length = 0; + file->type = 0; + + /* Build message. */ + PUT_HD(T_STAT, TAG); + PUT_32(file->fid); + + /* Send message. */ + rc = p9_transaction(connection); + if (rc != 0) { + return rc; + } + + /* Handle response. */ + file->length = GET_64(rx, MSG_STAT_LEN); + file->type = GET_08(rx, MSG_STAT_TYPE); + + + return 0; +} |