[snpnet] Give up entirely on the transmit queue

Practically speaking, it seems the convention is to only have one
packet pending and not rely upon any mechanism to associate returned
txbuf with txqueue.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/drivers/net/efi/snpnet.c b/src/drivers/net/efi/snpnet.c
index b725d407f206c91fbc214de798564ee055a3f5fa..9779081511019ceb088edd30cd5e9cb9b282efdb 100644 (file)
--- a/src/drivers/net/efi/snpnet.c
+++ b/src/drivers/net/efi/snpnet.c
@@ -57,28 +57,25 @@ static int snpnet_transmit ( struct net_device *netdev,
        struct snpnet_device *snpnetdev = netdev->priv;
        EFI_SIMPLE_NETWORK_PROTOCOL *snp = snpnetdev->snp;
        EFI_STATUS efirc;
+       void *txbuf=NULL;
        size_t len = iob_len ( iobuf );
 
        efirc = snp->Transmit ( snp, 0, len, iobuf->data, NULL, NULL, NULL );
-       return EFIRC_TO_RC ( efirc );
-}
-
-/**
- * Find a I/O buffer on the list of outstanding Tx buffers and complete it.
- *
- * @v snpnetdev                SNP network device
- * @v txbuf            Buffer address
- */
-static void snpnet_complete ( struct net_device *netdev, void *txbuf ) {
-       struct io_buffer *tmp;
-       struct io_buffer *iobuf;
-
-       list_for_each_entry_safe ( iobuf, tmp, &netdev->tx_queue, list ) {
-               if ( iobuf->data == txbuf ) {
-                       netdev_tx_complete ( netdev, iobuf );
+       if (efirc) {
+               return EFIRC_TO_RC ( efirc );
+       }
+       /* since GetStatus is so inconsistent, don't try more than one outstanding transmit at a time */
+       while ( txbuf == NULL ) {
+               efirc = snp->GetStatus ( snp, NULL, &txbuf );
+               if ( efirc ) {
+                       DBGC ( snp, "SNP %p could not get status %s\n", snp,
+                              efi_strerror ( efirc ) );
                        break;
                }
+
        }
+       netdev_tx_complete ( netdev, iobuf );
+       return 0;
 }
 
 /**
@@ -92,22 +89,6 @@ static void snpnet_poll ( struct net_device *netdev ) {
        EFI_STATUS efirc;
        struct io_buffer *iobuf = NULL;
        UINTN len;
-       void *txbuf;
-
-       /* Process Tx completions */
-       while ( 1 ) {
-               efirc = snp->GetStatus ( snp, NULL, &txbuf );
-               if ( efirc ) {
-                       DBGC ( snp, "SNP %p could not get status %s\n", snp,
-                              efi_strerror ( efirc ) );
-                       break;
-               }
-
-               if ( txbuf == NULL )
-                       break;
-
-               snpnet_complete ( netdev, txbuf );
-       }
 
        /* Process received packets */
        while ( 1 ) {