eal: allow external interrupt handler

Add RTE_INTR_HANDLE_EXT handler type for PMDs that do not support VFIO or
UIO.  Those are expected to manage the file descriptor themselves.

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: David Marchand <david.marchand@6wind.com>

diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
index 078318c..79eedaf 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
+++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
@@ -691,26 +691,30 @@ eal_intr_process_interrupts(struct epoll_event *events, int nfds)
                        bytes_read = sizeof(buf.vfio_intr_count);
                        break;
 #endif
+               case RTE_INTR_HANDLE_EXT:
                default:
                        bytes_read = 1;
                        break;
                }
 
-               /**
-                * read out to clear the ready-to-be-read flag
-                * for epoll_wait.
-                */
-               bytes_read = read(events[n].data.fd, &buf, bytes_read);
-               if (bytes_read < 0) {
-                       if (errno == EINTR || errno == EWOULDBLOCK)
-                               continue;
-
-                       RTE_LOG(ERR, EAL, "Error reading from file "
-                               "descriptor %d: %s\n", events[n].data.fd,
-                                                       strerror(errno));
-               } else if (bytes_read == 0)
-                       RTE_LOG(ERR, EAL, "Read nothing from file "
-                               "descriptor %d\n", events[n].data.fd);
+               if (src->intr_handle.type != RTE_INTR_HANDLE_EXT) {
+                       /**
+                        * read out to clear the ready-to-be-read flag
+                        * for epoll_wait.
+                        */
+                       bytes_read = read(events[n].data.fd, &buf, bytes_read);
+                       if (bytes_read < 0) {
+                               if (errno == EINTR || errno == EWOULDBLOCK)
+                                       continue;
+
+                               RTE_LOG(ERR, EAL, "Error reading from file "
+                                       "descriptor %d: %s\n",
+                                       events[n].data.fd,
+                                       strerror(errno));
+                       } else if (bytes_read == 0)
+                               RTE_LOG(ERR, EAL, "Read nothing from file "
+                                       "descriptor %d\n", events[n].data.fd);
+               }
 
                /* grab a lock, again to call callbacks and update status. */
                rte_spinlock_lock(&intr_lock);

diff --git a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
index 45071b7..b095b86 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
+++ b/lib/librte_eal/linuxapp/eal/include/exec-env/rte_interrupts.h
@@ -48,6 +48,7 @@ enum rte_intr_handle_type {
        RTE_INTR_HANDLE_VFIO_MSI,     /**< vfio device handle (MSI) */
        RTE_INTR_HANDLE_VFIO_MSIX,    /**< vfio device handle (MSIX) */
        RTE_INTR_HANDLE_ALARM,    /**< alarm handle */
+       RTE_INTR_HANDLE_EXT, /**< external handler */
        RTE_INTR_HANDLE_MAX
 };