mirror of https://github.com/F-Stack/f-stack.git
127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <rte_bus_pci.h>
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#include <rte_malloc.h>
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#include "nfp_nfpu.h"
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/* PF BAR and expansion BAR for the NSP interface */
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#define NFP_CFG_PCIE_BAR 0
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#define NFP_CFG_EXP_BAR 7
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#define NFP_CFG_EXP_BAR_CFG_BASE 0x30000
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#define NFP_LOCKFILE_PATH_FMT "%s/nfp%d"
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/* get nfp lock file path (/var/lock if root, $HOME otherwise) */
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static void
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nspu_get_lockfile_path(char *buffer, int bufsz, nfpu_desc_t *desc)
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{
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const char *dir = "/var/lock";
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const char *home_dir = getenv("HOME");
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if (getuid() != 0 && home_dir != NULL)
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dir = home_dir;
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/* use current prefix as file path */
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snprintf(buffer, bufsz, NFP_LOCKFILE_PATH_FMT, dir,
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desc->nfp);
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}
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/* There could be other NFP userspace tools using the NSP interface.
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* Make sure there is no other process using it and locking the access for
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* avoiding problems.
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*/
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static int
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nspv_aquire_process_lock(nfpu_desc_t *desc)
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{
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int rc;
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struct flock lock;
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char lockname[30];
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nspu_get_lockfile_path(lockname, sizeof(lockname), desc);
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/* Using S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH */
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desc->lock = open(lockname, O_RDWR | O_CREAT, 0666);
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if (desc->lock < 0)
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return desc->lock;
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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rc = -1;
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while (rc != 0) {
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rc = fcntl(desc->lock, F_SETLK, &lock);
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if (rc < 0) {
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if ((errno != EAGAIN) && (errno != EACCES)) {
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close(desc->lock);
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return rc;
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}
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}
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}
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return 0;
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}
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int
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nfpu_open(struct rte_pci_device *pci_dev, nfpu_desc_t *desc, int nfp)
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{
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void *cfg_base, *mem_base;
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size_t barsz;
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int ret = 0;
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int i = 0;
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desc->nfp = nfp;
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ret = nspv_aquire_process_lock(desc);
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if (ret)
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return -1;
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barsz = pci_dev->mem_resource[0].len;
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/* barsz in log2 */
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while (barsz >>= 1)
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i++;
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barsz = i;
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/* Sanity check: we can assume any bar size less than 1MB an error */
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if (barsz < 20)
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return -1;
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/* Getting address for NFP expansion BAR registers */
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cfg_base = pci_dev->mem_resource[0].addr;
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cfg_base = (uint8_t *)cfg_base + NFP_CFG_EXP_BAR_CFG_BASE;
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/* Getting address for NFP NSP interface registers */
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mem_base = pci_dev->mem_resource[0].addr;
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mem_base = (uint8_t *)mem_base + (NFP_CFG_EXP_BAR << (barsz - 3));
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desc->nspu = rte_malloc("nfp nspu", sizeof(nspu_desc_t), 0);
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nfp_nspu_init(desc->nspu, desc->nfp, NFP_CFG_PCIE_BAR, barsz,
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NFP_CFG_EXP_BAR, cfg_base, mem_base);
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return ret;
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}
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int
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nfpu_close(nfpu_desc_t *desc)
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{
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char lockname[30];
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rte_free(desc->nspu);
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close(desc->lock);
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nspu_get_lockfile_path(lockname, sizeof(lockname), desc);
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unlink(lockname);
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return 0;
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}
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