/* * This file is provided under a CDDLv1 license. When using or * redistributing this file, you may do so under this license. * In redistributing this file this license must be included * and no other modification of this header file is permitted. * * CDDL LICENSE SUMMARY * * Copyright(c) 1999 - 2009 Intel Corporation. All rights reserved. * * The contents of this file are subject to the terms of Version * 1.0 of the Common Development and Distribution License (the "License"). * * You should have received a copy of the License with this software. * You can obtain a copy of the License at * http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. */ /* * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * ********************************************************************** * * * Module Name: * * e1000g_tx.c * * * * Abstract: * * This file contains some routines that take care of Transmit, * * make the hardware to send the data pointed by the packet out * * on to the physical medium. * * * * ********************************************************************** */ #include "e1000g_sw.h" #include "e1000g_debug.h" static boolean_t e1000g_send(struct e1000g *, mblk_t *); static int e1000g_tx_copy(e1000g_tx_ring_t *, p_tx_sw_packet_t, mblk_t *, boolean_t); static int e1000g_tx_bind(e1000g_tx_ring_t *, p_tx_sw_packet_t, mblk_t *); static boolean_t e1000g_retrieve_context(mblk_t *, context_data_t *, size_t); static boolean_t e1000g_check_context(e1000g_tx_ring_t *, context_data_t *); static int e1000g_fill_tx_ring(e1000g_tx_ring_t *, LIST_DESCRIBER *, context_data_t *); static void e1000g_fill_context_descriptor(context_data_t *, struct e1000_context_desc *); static int e1000g_fill_tx_desc(e1000g_tx_ring_t *, p_tx_sw_packet_t, uint64_t, size_t); static uint32_t e1000g_fill_82544_desc(uint64_t Address, size_t Length, p_desc_array_t desc_array); static int e1000g_tx_workaround_PCIX_82544(p_tx_sw_packet_t, uint64_t, size_t); static int e1000g_tx_workaround_jumbo_82544(p_tx_sw_packet_t, uint64_t, size_t); static void e1000g_82547_timeout(void *); static void e1000g_82547_tx_move_tail(e1000g_tx_ring_t *); static void e1000g_82547_tx_move_tail_work(e1000g_tx_ring_t *); #ifndef E1000G_DEBUG #pragma inline(e1000g_tx_copy) #pragma inline(e1000g_tx_bind) #pragma inline(e1000g_retrieve_context) #pragma inline(e1000g_check_context) #pragma inline(e1000g_fill_tx_ring) #pragma inline(e1000g_fill_context_descriptor) #pragma inline(e1000g_fill_tx_desc) #pragma inline(e1000g_fill_82544_desc) #pragma inline(e1000g_tx_workaround_PCIX_82544) #pragma inline(e1000g_tx_workaround_jumbo_82544) #pragma inline(e1000g_free_tx_swpkt) #endif /* * e1000g_free_tx_swpkt - free up the tx sw packet * * Unbind the previously bound DMA handle for a given * transmit sw packet. And reset the sw packet data. */ void e1000g_free_tx_swpkt(register p_tx_sw_packet_t packet) { switch (packet->data_transfer_type) { case USE_BCOPY: packet->tx_buf->len = 0; break; #ifdef __sparc case USE_DVMA: dvma_unload(packet->tx_dma_handle, 0, -1); break; #endif case USE_DMA: (void) ddi_dma_unbind_handle(packet->tx_dma_handle); break; default: break; } /* * The mblk has been stripped off the sw packet * and will be freed in a triggered soft intr. */ ASSERT(packet->mp == NULL); packet->data_transfer_type = USE_NONE; packet->num_mblk_frag = 0; packet->num_desc = 0; } mblk_t * e1000g_m_tx(void *arg, mblk_t *mp) { struct e1000g *Adapter = (struct e1000g *)arg; mblk_t *next; rw_enter(&Adapter->chip_lock, RW_READER); if ((Adapter->e1000g_state & E1000G_SUSPENDED) || !(Adapter->e1000g_state & E1000G_STARTED) || (Adapter->link_state != LINK_STATE_UP)) { freemsgchain(mp); mp = NULL; } while (mp != NULL) { next = mp->b_next; mp->b_next = NULL; if (!e1000g_send(Adapter, mp)) { mp->b_next = next; break; } mp = next; } rw_exit(&Adapter->chip_lock); return (mp); } /* * e1000g_send - send packets onto the wire * * Called from e1000g_m_tx with an mblk ready to send. this * routine sets up the transmit descriptors and sends data to * the wire. It also pushes the just transmitted packet to * the used tx sw packet list. */ static boolean_t e1000g_send(struct e1000g *Adapter, mblk_t *mp) { p_tx_sw_packet_t packet; LIST_DESCRIBER pending_list; size_t len; size_t msg_size; uint32_t frag_count; int desc_count; uint32_t desc_total; uint32_t bcopy_thresh; uint32_t hdr_frag_len; boolean_t tx_undersize_flag; mblk_t *nmp; mblk_t *tmp; mblk_t *new_mp; mblk_t *pre_mp; mblk_t *next_mp; e1000g_tx_ring_t *tx_ring; context_data_t cur_context; tx_ring = Adapter->tx_ring; bcopy_thresh = Adapter->tx_bcopy_thresh; /* Get the total size and frags number of the message */ tx_undersize_flag = B_FALSE; frag_count = 0; msg_size = 0; for (nmp = mp; nmp; nmp = nmp->b_cont) { frag_count++; msg_size += MBLKL(nmp); } /* retrieve and compute information for context descriptor */ if (!e1000g_retrieve_context(mp, &cur_context, msg_size)) { freemsg(mp); return (B_TRUE); } /* * Make sure the packet is less than the allowed size */ if (!cur_context.lso_flag && (msg_size > Adapter->max_frame_size - ETHERFCSL)) { /* * For the over size packet, we'll just drop it. * So we return B_TRUE here. */ E1000G_DEBUGLOG_1(Adapter, E1000G_WARN_LEVEL, "Tx packet out of bound. length = %d \n", msg_size); E1000G_STAT(tx_ring->stat_over_size); freemsg(mp); return (B_TRUE); } /* * Check and reclaim tx descriptors. * This low water mark check should be done all the time as * Transmit interrupt delay can produce Transmit interrupts little * late and that may cause few problems related to reaping Tx * Descriptors... As you may run short of them before getting any * transmit interrupt... */ if (tx_ring->tbd_avail < DEFAULT_TX_NO_RESOURCE) { (void) e1000g_recycle(tx_ring); E1000G_DEBUG_STAT(tx_ring->stat_recycle); if (tx_ring->tbd_avail < DEFAULT_TX_NO_RESOURCE) { E1000G_DEBUG_STAT(tx_ring->stat_lack_desc); goto tx_no_resource; } } /* * If the message size is less than the minimum ethernet packet size, * we'll use bcopy to send it, and padd it to 60 bytes later. */ if (msg_size < ETHERMIN) { E1000G_DEBUG_STAT(tx_ring->stat_under_size); tx_undersize_flag = B_TRUE; } /* Initialize variables */ desc_count = 1; /* The initial value should be greater than 0 */ desc_total = 0; new_mp = NULL; QUEUE_INIT_LIST(&pending_list); /* Process each mblk fragment and fill tx descriptors */ /* * The software should guarantee LSO packet header(MAC+IP+TCP) * to be within one descriptor. Here we reallocate and refill the * the header if it's physical memory non-contiguous. */ if (cur_context.lso_flag) { /* find the last fragment of the header */ len = MBLKL(mp); ASSERT(len > 0); next_mp = mp; pre_mp = NULL; while (len < cur_context.hdr_len) { pre_mp = next_mp; next_mp = next_mp->b_cont; len += MBLKL(next_mp); } /* * If the header and the payload are in different mblks, * we simply force the header to be copied into pre-allocated * page-aligned buffer. */ if (len == cur_context.hdr_len) goto adjust_threshold; hdr_frag_len = cur_context.hdr_len - (len - MBLKL(next_mp)); /* * There are three cases we need to reallocate a mblk for the * last header fragment: * * 1. the header is in multiple mblks and the last fragment * share the same mblk with the payload * * 2. the header is in a single mblk shared with the payload * and the header is physical memory non-contiguous * * 3. there is 4 KB boundary within the header and 64 bytes * following the end of the header bytes. The case may cause * TCP data corruption issue. * * The workaround for the case #2 and case #3 is: * Assuming standard Ethernet/IP/TCP headers of 54 bytes, * this means that the buffer(containing the headers) should * not start -118 bytes before a 4 KB boundary. For example, * 128-byte alignment for this buffer could be used to fulfill * this condition. */ if ((next_mp != mp) || (P2NPHASE((uintptr_t)next_mp->b_rptr, E1000_LSO_FIRST_DESC_ALIGNMENT_BOUNDARY_4K) < E1000_LSO_FIRST_DESC_ALIGNMENT)) { E1000G_DEBUG_STAT(tx_ring->stat_lso_header_fail); /* * reallocate the mblk for the last header fragment, * expect to bcopy into pre-allocated page-aligned * buffer */ new_mp = allocb(hdr_frag_len, NULL); if (!new_mp) return (B_FALSE); bcopy(next_mp->b_rptr, new_mp->b_rptr, hdr_frag_len); /* link the new header fragment with the other parts */ new_mp->b_wptr = new_mp->b_rptr + hdr_frag_len; new_mp->b_cont = next_mp; if (pre_mp) pre_mp->b_cont = new_mp; else mp = new_mp; next_mp->b_rptr += hdr_frag_len; frag_count++; } adjust_threshold: /* * adjust the bcopy threshhold to guarantee * the header to use bcopy way */ if (bcopy_thresh < cur_context.hdr_len) bcopy_thresh = cur_context.hdr_len; } packet = NULL; nmp = mp; while (nmp) { tmp = nmp->b_cont; len = MBLKL(nmp); /* Check zero length mblks */ if (len == 0) { E1000G_DEBUG_STAT(tx_ring->stat_empty_frags); /* * If there're no packet buffers have been used, * or we just completed processing a buffer, then * skip the empty mblk fragment. * Otherwise, there's still a pending buffer that * needs to be processed (tx_copy). */ if (desc_count > 0) { nmp = tmp; continue; } } /* * Get a new TxSwPacket to process mblk buffers. */ if (desc_count > 0) { mutex_enter(&tx_ring->freelist_lock); packet = (p_tx_sw_packet_t) QUEUE_POP_HEAD(&tx_ring->free_list); mutex_exit(&tx_ring->freelist_lock); if (packet == NULL) { E1000G_DEBUGLOG_0(Adapter, E1000G_INFO_LEVEL, "No Tx SwPacket available\n"); E1000G_STAT(tx_ring->stat_no_swpkt); goto tx_send_failed; } QUEUE_PUSH_TAIL(&pending_list, &packet->Link); } ASSERT(packet); /* * If the size of the fragment is less than the tx_bcopy_thresh * we'll use bcopy; Otherwise, we'll use DMA binding. */ if ((len <= bcopy_thresh) || tx_undersize_flag) { desc_count = e1000g_tx_copy(tx_ring, packet, nmp, tx_undersize_flag); E1000G_DEBUG_STAT(tx_ring->stat_copy); } else { desc_count = e1000g_tx_bind(tx_ring, packet, nmp); E1000G_DEBUG_STAT(tx_ring->stat_bind); } if (desc_count > 0) desc_total += desc_count; else if (desc_count < 0) goto tx_send_failed; nmp = tmp; } /* Assign the message to the last sw packet */ ASSERT(packet); ASSERT(packet->mp == NULL); packet->mp = mp; /* Try to recycle the tx descriptors again */ if (tx_ring->tbd_avail < (desc_total + 3)) { E1000G_DEBUG_STAT(tx_ring->stat_recycle_retry); (void) e1000g_recycle(tx_ring); } mutex_enter(&tx_ring->tx_lock); /* * If the number of available tx descriptors is not enough for transmit * (one redundant descriptor and one hw checksum context descriptor are * included), then return failure. */ if (tx_ring->tbd_avail < (desc_total + 3)) { E1000G_DEBUGLOG_0(Adapter, E1000G_INFO_LEVEL, "No Enough Tx descriptors\n"); E1000G_STAT(tx_ring->stat_no_desc); mutex_exit(&tx_ring->tx_lock); goto tx_send_failed; } desc_count = e1000g_fill_tx_ring(tx_ring, &pending_list, &cur_context); mutex_exit(&tx_ring->tx_lock); ASSERT(desc_count > 0); /* Send successful */ return (B_TRUE); tx_send_failed: /* Restore mp to original */ if (new_mp) { if (pre_mp) { pre_mp->b_cont = next_mp; } new_mp->b_cont = NULL; freemsg(new_mp); next_mp->b_rptr -= hdr_frag_len; } /* * Enable Transmit interrupts, so that the interrupt routine can * call mac_tx_update() when transmit descriptors become available. */ tx_ring->resched_timestamp = ddi_get_lbolt(); tx_ring->resched_needed = B_TRUE; if (!Adapter->tx_intr_enable) e1000g_mask_tx_interrupt(Adapter); /* Free pending TxSwPackets */ packet = (p_tx_sw_packet_t)QUEUE_GET_HEAD(&pending_list); while (packet) { packet->mp = NULL; e1000g_free_tx_swpkt(packet); packet = (p_tx_sw_packet_t) QUEUE_GET_NEXT(&pending_list, &packet->Link); } /* Return pending TxSwPackets to the "Free" list */ mutex_enter(&tx_ring->freelist_lock); QUEUE_APPEND(&tx_ring->free_list, &pending_list); mutex_exit(&tx_ring->freelist_lock); E1000G_STAT(tx_ring->stat_send_fail); /* Message will be scheduled for re-transmit */ return (B_FALSE); tx_no_resource: /* * Enable Transmit interrupts, so that the interrupt routine can * call mac_tx_update() when transmit descriptors become available. */ tx_ring->resched_timestamp = ddi_get_lbolt(); tx_ring->resched_needed = B_TRUE; if (!Adapter->tx_intr_enable) e1000g_mask_tx_interrupt(Adapter); /* Message will be scheduled for re-transmit */ return (B_FALSE); } static boolean_t e1000g_retrieve_context(mblk_t *mp, context_data_t *cur_context, size_t msg_size) { uintptr_t ip_start; uintptr_t tcp_start; mblk_t *nmp; uint32_t lsoflags; uint32_t mss; bzero(cur_context, sizeof (context_data_t)); /* first check lso information */ mac_lso_get(mp, &mss, &lsoflags); /* retrieve checksum info */ mac_hcksum_get(mp, &cur_context->cksum_start, &cur_context->cksum_stuff, NULL, NULL, &cur_context->cksum_flags); /* retrieve ethernet header size */ if (((struct ether_vlan_header *)(uintptr_t)mp->b_rptr)->ether_tpid == htons(ETHERTYPE_VLAN)) cur_context->ether_header_size = sizeof (struct ether_vlan_header); else cur_context->ether_header_size = sizeof (struct ether_header); if (lsoflags & HW_LSO) { ASSERT(mss != 0); /* free the invalid packet */ if (mss == 0 || !((cur_context->cksum_flags & HCK_PARTIALCKSUM) && (cur_context->cksum_flags & HCK_IPV4_HDRCKSUM))) { return (B_FALSE); } cur_context->mss = (uint16_t)mss; cur_context->lso_flag = B_TRUE; /* * Some fields are cleared for the hardware to fill * in. We don't assume Ethernet header, IP header and * TCP header are always in the same mblk fragment, * while we assume each header is always within one * mblk fragment and Ethernet header is always in the * first mblk fragment. */ nmp = mp; ip_start = (uintptr_t)(nmp->b_rptr) + cur_context->ether_header_size; if (ip_start >= (uintptr_t)(nmp->b_wptr)) { ip_start = (uintptr_t)nmp->b_cont->b_rptr + (ip_start - (uintptr_t)(nmp->b_wptr)); nmp = nmp->b_cont; } tcp_start = ip_start + IPH_HDR_LENGTH((ipha_t *)ip_start); if (tcp_start >= (uintptr_t)(nmp->b_wptr)) { tcp_start = (uintptr_t)nmp->b_cont->b_rptr + (tcp_start - (uintptr_t)(nmp->b_wptr)); nmp = nmp->b_cont; } cur_context->hdr_len = cur_context->ether_header_size + IPH_HDR_LENGTH((ipha_t *)ip_start) + TCP_HDR_LENGTH((tcph_t *)tcp_start); ((ipha_t *)ip_start)->ipha_length = 0; ((ipha_t *)ip_start)->ipha_hdr_checksum = 0; /* calculate the TCP packet payload length */ cur_context->pay_len = msg_size - cur_context->hdr_len; } return (B_TRUE); } static boolean_t e1000g_check_context(e1000g_tx_ring_t *tx_ring, context_data_t *cur_context) { boolean_t context_reload; context_data_t *pre_context; struct e1000g *Adapter; context_reload = B_FALSE; pre_context = &tx_ring->pre_context; Adapter = tx_ring->adapter; /* * The following code determine if the context descriptor is * needed to be reloaded. The sequence of the conditions is * made by their possibilities of changing. */ /* * workaround for 82546EB, context descriptor must be reloaded * per LSO/hw_cksum packet if LSO is enabled. */ if (Adapter->lso_premature_issue && Adapter->lso_enable && (cur_context->cksum_flags != 0)) { context_reload = B_TRUE; } else if (cur_context->lso_flag) { if ((cur_context->lso_flag != pre_context->lso_flag) || (cur_context->cksum_flags != pre_context->cksum_flags) || (cur_context->pay_len != pre_context->pay_len) || (cur_context->mss != pre_context->mss) || (cur_context->hdr_len != pre_context->hdr_len) || (cur_context->cksum_stuff != pre_context->cksum_stuff) || (cur_context->cksum_start != pre_context->cksum_start) || (cur_context->ether_header_size != pre_context->ether_header_size)) { context_reload = B_TRUE; } } else if (cur_context->cksum_flags != 0) { if ((cur_context->lso_flag != pre_context->lso_flag) || (cur_context->cksum_flags != pre_context->cksum_flags) || (cur_context->cksum_stuff != pre_context->cksum_stuff) || (cur_context->cksum_start != pre_context->cksum_start) || (cur_context->ether_header_size != pre_context->ether_header_size)) { context_reload = B_TRUE; } } return (context_reload); } static int e1000g_fill_tx_ring(e1000g_tx_ring_t *tx_ring, LIST_DESCRIBER *pending_list, context_data_t *cur_context) { struct e1000g *Adapter; struct e1000_hw *hw; p_tx_sw_packet_t first_packet; p_tx_sw_packet_t packet; p_tx_sw_packet_t previous_packet; boolean_t context_reload; struct e1000_tx_desc *first_data_desc; struct e1000_tx_desc *next_desc; struct e1000_tx_desc *descriptor; int desc_count; boolean_t buff_overrun_flag; int i; Adapter = tx_ring->adapter; hw = &Adapter->shared; desc_count = 0; first_packet = NULL; first_data_desc = NULL; descriptor = NULL; first_packet = NULL; packet = NULL; buff_overrun_flag = B_FALSE; next_desc = tx_ring->tbd_next; /* Context descriptor reload check */ context_reload = e1000g_check_context(tx_ring, cur_context); if (context_reload) { first_packet = (p_tx_sw_packet_t)QUEUE_GET_HEAD(pending_list); descriptor = next_desc; e1000g_fill_context_descriptor(cur_context, (struct e1000_context_desc *)descriptor); /* Check the wrap-around case */ if (descriptor == tx_ring->tbd_last) next_desc = tx_ring->tbd_first; else next_desc++; desc_count++; } first_data_desc = next_desc; packet = (p_tx_sw_packet_t)QUEUE_GET_HEAD(pending_list); while (packet) { ASSERT(packet->num_desc); for (i = 0; i < packet->num_desc; i++) { ASSERT(tx_ring->tbd_avail > 0); descriptor = next_desc; descriptor->buffer_addr = packet->desc[i].address; descriptor->lower.data = packet->desc[i].length; /* Zero out status */ descriptor->upper.data = 0; descriptor->lower.data |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D; /* must set RS on every outgoing descriptor */ descriptor->lower.data |= E1000_TXD_CMD_RS; if (cur_context->lso_flag) descriptor->lower.data |= E1000_TXD_CMD_TSE; /* Check the wrap-around case */ if (descriptor == tx_ring->tbd_last) next_desc = tx_ring->tbd_first; else next_desc++; desc_count++; /* * workaround for 82546EB errata 33, hang in PCI-X * systems due to 2k Buffer Overrun during Transmit * Operation. The workaround applies to all the Intel * PCI-X chips. */ if (hw->bus.type == e1000_bus_type_pcix && descriptor == first_data_desc && ((descriptor->lower.data & E1000G_TBD_LENGTH_MASK) > E1000_TX_BUFFER_OEVRRUN_THRESHOLD)) { /* modified the first descriptor */ descriptor->lower.data &= ~E1000G_TBD_LENGTH_MASK; descriptor->lower.flags.length = E1000_TX_BUFFER_OEVRRUN_THRESHOLD; /* insert a new descriptor */ ASSERT(tx_ring->tbd_avail > 0); next_desc->buffer_addr = packet->desc[0].address + E1000_TX_BUFFER_OEVRRUN_THRESHOLD; next_desc->lower.data = packet->desc[0].length - E1000_TX_BUFFER_OEVRRUN_THRESHOLD; /* Zero out status */ next_desc->upper.data = 0; next_desc->lower.data |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D; /* must set RS on every outgoing descriptor */ next_desc->lower.data |= E1000_TXD_CMD_RS; if (cur_context->lso_flag) next_desc->lower.data |= E1000_TXD_CMD_TSE; descriptor = next_desc; /* Check the wrap-around case */ if (next_desc == tx_ring->tbd_last) next_desc = tx_ring->tbd_first; else next_desc++; desc_count++; buff_overrun_flag = B_TRUE; } } if (buff_overrun_flag) { packet->num_desc++; buff_overrun_flag = B_FALSE; } if (first_packet != NULL) { /* * Count the checksum context descriptor for * the first SwPacket. */ first_packet->num_desc++; first_packet = NULL; } packet->tickstamp = ddi_get_lbolt64(); previous_packet = packet; packet = (p_tx_sw_packet_t) QUEUE_GET_NEXT(pending_list, &packet->Link); } /* * workaround for 82546EB errata 21, LSO Premature Descriptor Write Back */ if (Adapter->lso_premature_issue && cur_context->lso_flag && ((descriptor->lower.data & E1000G_TBD_LENGTH_MASK) > 8)) { /* modified the previous descriptor */ descriptor->lower.data -= 4; /* insert a new descriptor */ ASSERT(tx_ring->tbd_avail > 0); /* the lower 20 bits of lower.data is the length field */ next_desc->buffer_addr = descriptor->buffer_addr + (descriptor->lower.data & E1000G_TBD_LENGTH_MASK); next_desc->lower.data = 4; /* Zero out status */ next_desc->upper.data = 0; /* It must be part of a LSO packet */ next_desc->lower.data |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D | E1000_TXD_CMD_RS | E1000_TXD_CMD_TSE; descriptor = next_desc; /* Check the wrap-around case */ if (descriptor == tx_ring->tbd_last) next_desc = tx_ring->tbd_first; else next_desc++; desc_count++; /* update the number of descriptors */ previous_packet->num_desc++; } ASSERT(descriptor); if (cur_context->cksum_flags) { if (cur_context->cksum_flags & HCK_IPV4_HDRCKSUM) ((struct e1000_data_desc *)first_data_desc)-> upper.fields.popts |= E1000_TXD_POPTS_IXSM; if (cur_context->cksum_flags & HCK_PARTIALCKSUM) ((struct e1000_data_desc *)first_data_desc)-> upper.fields.popts |= E1000_TXD_POPTS_TXSM; } /* * Last Descriptor of Packet needs End Of Packet (EOP), Report * Status (RS) set. */ if (Adapter->tx_intr_delay) { descriptor->lower.data |= E1000_TXD_CMD_IDE | E1000_TXD_CMD_EOP; } else { descriptor->lower.data |= E1000_TXD_CMD_EOP; } /* Set append Ethernet CRC (IFCS) bits */ if (cur_context->lso_flag) { first_data_desc->lower.data |= E1000_TXD_CMD_IFCS; } else { descriptor->lower.data |= E1000_TXD_CMD_IFCS; } /* * Sync the Tx descriptors DMA buffer */ (void) ddi_dma_sync(tx_ring->tbd_dma_handle, 0, 0, DDI_DMA_SYNC_FORDEV); tx_ring->tbd_next = next_desc; /* * Advance the Transmit Descriptor Tail (Tdt), this tells the * FX1000 that this frame is available to transmit. */ if (hw->mac.type == e1000_82547) e1000g_82547_tx_move_tail(tx_ring); else E1000_WRITE_REG(hw, E1000_TDT(0), (uint32_t)(next_desc - tx_ring->tbd_first)); if (e1000g_check_acc_handle(Adapter->osdep.reg_handle) != DDI_FM_OK) { ddi_fm_service_impact(Adapter->dip, DDI_SERVICE_DEGRADED); Adapter->e1000g_state |= E1000G_ERROR; } /* Put the pending SwPackets to the "Used" list */ mutex_enter(&tx_ring->usedlist_lock); QUEUE_APPEND(&tx_ring->used_list, pending_list); tx_ring->tbd_avail -= desc_count; mutex_exit(&tx_ring->usedlist_lock); /* update LSO related data */ if (context_reload) tx_ring->pre_context = *cur_context; return (desc_count); } /* * e1000g_tx_setup - setup tx data structures * * This routine initializes all of the transmit related * structures. This includes the Transmit descriptors, * and the tx_sw_packet structures. */ void e1000g_tx_setup(struct e1000g *Adapter) { struct e1000_hw *hw; p_tx_sw_packet_t packet; uint32_t i; uint32_t buf_high; uint32_t buf_low; uint32_t reg_tipg; uint32_t reg_tctl; int size; e1000g_tx_ring_t *tx_ring; hw = &Adapter->shared; tx_ring = Adapter->tx_ring; /* init the lists */ /* * Here we don't need to protect the lists using the * usedlist_lock and freelist_lock, for they have * been protected by the chip_lock. */ QUEUE_INIT_LIST(&tx_ring->used_list); QUEUE_INIT_LIST(&tx_ring->free_list); /* Go through and set up each SW_Packet */ packet = tx_ring->packet_area; for (i = 0; i < Adapter->tx_freelist_num; i++, packet++) { /* Initialize this tx_sw_apcket area */ e1000g_free_tx_swpkt(packet); /* Add this tx_sw_packet to the free list */ QUEUE_PUSH_TAIL(&tx_ring->free_list, &packet->Link); } /* Setup TX descriptor pointers */ tx_ring->tbd_next = tx_ring->tbd_first; tx_ring->tbd_oldest = tx_ring->tbd_first; /* * Setup Hardware TX Registers */ /* Setup the Transmit Control Register (TCTL). */ reg_tctl = E1000_READ_REG(hw, E1000_TCTL); reg_tctl |= E1000_TCTL_PSP | E1000_TCTL_EN | (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT) | (E1000_COLLISION_DISTANCE << E1000_COLD_SHIFT) | E1000_TCTL_RTLC; /* Enable the MULR bit */ if (hw->bus.type == e1000_bus_type_pci_express) reg_tctl |= E1000_TCTL_MULR; E1000_WRITE_REG(hw, E1000_TCTL, reg_tctl); /* Setup HW Base and Length of Tx descriptor area */ size = (Adapter->tx_desc_num * sizeof (struct e1000_tx_desc)); E1000_WRITE_REG(hw, E1000_TDLEN(0), size); size = E1000_READ_REG(hw, E1000_TDLEN(0)); buf_low = (uint32_t)tx_ring->tbd_dma_addr; buf_high = (uint32_t)(tx_ring->tbd_dma_addr >> 32); /* * Write the highest location first and work backward to the lowest. * This is necessary for some adapter types to * prevent write combining from occurring. */ E1000_WRITE_REG(hw, E1000_TDBAH(0), buf_high); E1000_WRITE_REG(hw, E1000_TDBAL(0), buf_low); /* Setup our HW Tx Head & Tail descriptor pointers */ E1000_WRITE_REG(hw, E1000_TDH(0), 0); E1000_WRITE_REG(hw, E1000_TDT(0), 0); /* Set the default values for the Tx Inter Packet Gap timer */ if ((hw->mac.type == e1000_82542) && ((hw->revision_id == E1000_REVISION_2) || (hw->revision_id == E1000_REVISION_3))) { reg_tipg = DEFAULT_82542_TIPG_IPGT; reg_tipg |= DEFAULT_82542_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT; reg_tipg |= DEFAULT_82542_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT; } else if (hw->mac.type == e1000_80003es2lan) { reg_tipg = DEFAULT_82543_TIPG_IPGR1; reg_tipg |= DEFAULT_80003ES2LAN_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT; } else { if (hw->phy.media_type == e1000_media_type_fiber) reg_tipg = DEFAULT_82543_TIPG_IPGT_FIBER; else reg_tipg = DEFAULT_82543_TIPG_IPGT_COPPER; reg_tipg |= DEFAULT_82543_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT; reg_tipg |= DEFAULT_82543_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT; } E1000_WRITE_REG(hw, E1000_TIPG, reg_tipg); /* Setup Transmit Interrupt Delay Value */ E1000_WRITE_REG(hw, E1000_TIDV, Adapter->tx_intr_delay); E1000G_DEBUGLOG_1(Adapter, E1000G_INFO_LEVEL, "E1000_TIDV: 0x%x\n", Adapter->tx_intr_delay); if (hw->mac.type >= e1000_82540) { E1000_WRITE_REG(&Adapter->shared, E1000_TADV, Adapter->tx_intr_abs_delay); E1000G_DEBUGLOG_1(Adapter, E1000G_INFO_LEVEL, "E1000_TADV: 0x%x\n", Adapter->tx_intr_abs_delay); } tx_ring->tbd_avail = Adapter->tx_desc_num; /* Initialize stored context information */ bzero(&(tx_ring->pre_context), sizeof (context_data_t)); } /* * e1000g_recycle - recycle the tx descriptors and tx sw packets */ int e1000g_recycle(e1000g_tx_ring_t *tx_ring) { struct e1000g *Adapter; LIST_DESCRIBER pending_list; p_tx_sw_packet_t packet; mblk_t *mp; mblk_t *nmp; struct e1000_tx_desc *descriptor; int desc_count; int64_t delta; /* * This function will examine each TxSwPacket in the 'used' queue * if the e1000g is done with it then the associated resources (Tx * Descriptors) will be "freed" and the TxSwPacket will be * returned to the 'free' queue. */ Adapter = tx_ring->adapter; delta = 0; packet = (p_tx_sw_packet_t)QUEUE_GET_HEAD(&tx_ring->used_list); if (packet == NULL) { Adapter->stall_flag = B_FALSE; return (0); } desc_count = 0; QUEUE_INIT_LIST(&pending_list); /* Sync the Tx descriptor DMA buffer */ (void) ddi_dma_sync(tx_ring->tbd_dma_handle, 0, 0, DDI_DMA_SYNC_FORKERNEL); if (e1000g_check_dma_handle( tx_ring->tbd_dma_handle) != DDI_FM_OK) { ddi_fm_service_impact(Adapter->dip, DDI_SERVICE_DEGRADED); Adapter->e1000g_state |= E1000G_ERROR; return (0); } /* * While there are still TxSwPackets in the used queue check them */ mutex_enter(&tx_ring->usedlist_lock); while ((packet = (p_tx_sw_packet_t)QUEUE_GET_HEAD(&tx_ring->used_list)) != NULL) { /* * Get hold of the next descriptor that the e1000g will * report status back to (this will be the last descriptor * of a given sw packet). We only want to free the * sw packet (and it resources) if the e1000g is done * with ALL of the descriptors. If the e1000g is done * with the last one then it is done with all of them. */ ASSERT(packet->num_desc); descriptor = tx_ring->tbd_oldest + (packet->num_desc - 1); /* Check for wrap case */ if (descriptor > tx_ring->tbd_last) descriptor -= Adapter->tx_desc_num; /* * If the descriptor done bit is set free TxSwPacket and * associated resources */ if (descriptor->upper.fields.status & E1000_TXD_STAT_DD) { QUEUE_POP_HEAD(&tx_ring->used_list); QUEUE_PUSH_TAIL(&pending_list, &packet->Link); if (descriptor == tx_ring->tbd_last) tx_ring->tbd_oldest = tx_ring->tbd_first; else tx_ring->tbd_oldest = descriptor + 1; desc_count += packet->num_desc; } else { /* * Found a sw packet that the e1000g is not done * with then there is no reason to check the rest * of the queue. */ delta = ddi_get_lbolt64() - packet->tickstamp; break; } } tx_ring->tbd_avail += desc_count; Adapter->tx_pkt_cnt += desc_count; mutex_exit(&tx_ring->usedlist_lock); if (desc_count == 0) { E1000G_DEBUG_STAT(tx_ring->stat_recycle_none); /* * If the packet hasn't been sent out for seconds and * the transmitter is not under paused flowctrl condition, * the transmitter is considered to be stalled. */ if ((delta > Adapter->stall_threshold) && !(E1000_READ_REG(&Adapter->shared, E1000_STATUS) & E1000_STATUS_TXOFF)) { Adapter->stall_flag = B_TRUE; } return (0); } Adapter->stall_flag = B_FALSE; mp = NULL; nmp = NULL; packet = (p_tx_sw_packet_t)QUEUE_GET_HEAD(&pending_list); ASSERT(packet != NULL); while (packet != NULL) { if (packet->mp != NULL) { ASSERT(packet->mp->b_next == NULL); /* Assemble the message chain */ if (mp == NULL) { mp = packet->mp; nmp = packet->mp; } else { nmp->b_next = packet->mp; nmp = packet->mp; } /* Disconnect the message from the sw packet */ packet->mp = NULL; } /* Free the TxSwPackets */ e1000g_free_tx_swpkt(packet); packet = (p_tx_sw_packet_t) QUEUE_GET_NEXT(&pending_list, &packet->Link); } /* Return the TxSwPackets back to the FreeList */ mutex_enter(&tx_ring->freelist_lock); QUEUE_APPEND(&tx_ring->free_list, &pending_list); mutex_exit(&tx_ring->freelist_lock); if (mp != NULL) freemsgchain(mp); return (desc_count); } /* * 82544 Coexistence issue workaround: * There are 2 issues. * 1. If a 32 bit split completion happens from P64H2 and another * agent drives a 64 bit request/split completion after ONLY * 1 idle clock (BRCM/Emulex/Adaptec fiber channel cards) then * 82544 has a problem where in to clock all the data in, it * looks at REQ64# signal and since it has changed so fast (i.e. 1 * idle clock turn around), it will fail to clock all the data in. * Data coming from certain ending addresses has exposure to this issue. * * To detect this issue, following equation can be used... * SIZE[3:0] + ADDR[2:0] = SUM[3:0]. * If SUM[3:0] is in between 1 to 4, we will have this issue. * * ROOT CAUSE: * The erratum involves the 82544 PCIX elasticity FIFO implementations as * 64-bit FIFO's and flushing of the final partial-bytes corresponding * to the end of a requested read burst. Under a specific burst condition * of ending-data alignment and 32-byte split-completions, the final * byte(s) of split-completion data require an extra clock cycle to flush * into 64-bit FIFO orientation. An incorrect logic dependency on the * REQ64# signal occurring during during this clock cycle may cause the * residual byte(s) to be lost, thereby rendering the internal DMA client * forever awaiting the final byte(s) for an outbound data-fetch. The * erratum is confirmed to *only* occur if certain subsequent external * 64-bit PCIX bus transactions occur immediately (minimum possible bus * turn- around) following the odd-aligned 32-bit split-completion * containing the final byte(s). Intel has confirmed that this has been * seen only with chipset/bridges which have the capability to provide * 32-bit split-completion data, and in the presence of newer PCIX bus * agents which fully-optimize the inter-transaction turn-around (zero * additional initiator latency when pre-granted bus ownership). * * This issue does not exist in PCI bus mode, when any agent is operating * in 32 bit only mode or on chipsets that do not do 32 bit split * completions for 64 bit read requests (Serverworks chipsets). P64H2 does * 32 bit split completions for any read request that has bit 2 set to 1 * for the requested address and read request size is more than 8 bytes. * * 2. Another issue is related to 82544 driving DACs under the similar * scenario (32 bit split completion followed by 64 bit transaction with * only 1 cycle turnaround). This issue is still being root caused. We * think that both of these issues can be avoided if following workaround * is implemented. It seems DAC issues is related to ending addresses being * 0x9, 0xA, 0xB, 0xC and hence ending up at odd boundaries in elasticity * FIFO which does not get flushed due to REQ64# dependency. We will only * know the full story after it has been simulated successfully by HW team. * * WORKAROUND: * Make sure we do not have ending address as 1,2,3,4(Hang) or 9,a,b,c(DAC) */ static uint32_t e1000g_fill_82544_desc(uint64_t address, size_t length, p_desc_array_t desc_array) { /* * Since issue is sensitive to length and address. * Let us first check the address... */ uint32_t safe_terminator; if (length <= 4) { desc_array->descriptor[0].address = address; desc_array->descriptor[0].length = (uint32_t)length; desc_array->elements = 1; return (desc_array->elements); } safe_terminator = (uint32_t)((((uint32_t)address & 0x7) + (length & 0xF)) & 0xF); /* * if it does not fall between 0x1 to 0x4 and 0x9 to 0xC then * return */ if (safe_terminator == 0 || (safe_terminator > 4 && safe_terminator < 9) || (safe_terminator > 0xC && safe_terminator <= 0xF)) { desc_array->descriptor[0].address = address; desc_array->descriptor[0].length = (uint32_t)length; desc_array->elements = 1; return (desc_array->elements); } desc_array->descriptor[0].address = address; desc_array->descriptor[0].length = length - 4; desc_array->descriptor[1].address = address + (length - 4); desc_array->descriptor[1].length = 4; desc_array->elements = 2; return (desc_array->elements); } static int e1000g_tx_copy(e1000g_tx_ring_t *tx_ring, p_tx_sw_packet_t packet, mblk_t *mp, boolean_t tx_undersize_flag) { size_t len; size_t len1; dma_buffer_t *tx_buf; mblk_t *nmp; boolean_t finished; int desc_count; desc_count = 0; tx_buf = packet->tx_buf; len = MBLKL(mp); ASSERT((tx_buf->len + len) <= tx_buf->size); if (len > 0) { bcopy(mp->b_rptr, tx_buf->address + tx_buf->len, len); tx_buf->len += len; packet->num_mblk_frag++; } nmp = mp->b_cont; if (nmp == NULL) { finished = B_TRUE; } else { len1 = MBLKL(nmp); if ((tx_buf->len + len1) > tx_buf->size) finished = B_TRUE; else if (tx_undersize_flag) finished = B_FALSE; else if (len1 > tx_ring->adapter->tx_bcopy_thresh) finished = B_TRUE; else finished = B_FALSE; } if (finished) { E1000G_DEBUG_STAT_COND(tx_ring->stat_multi_copy, (tx_buf->len > len)); /* * If the packet is smaller than 64 bytes, which is the * minimum ethernet packet size, pad the packet to make * it at least 60 bytes. The hardware will add 4 bytes * for CRC. */ if (tx_undersize_flag) { ASSERT(tx_buf->len < ETHERMIN); bzero(tx_buf->address + tx_buf->len, ETHERMIN - tx_buf->len); tx_buf->len = ETHERMIN; } #ifdef __sparc if (packet->dma_type == USE_DVMA) dvma_sync(tx_buf->dma_handle, 0, DDI_DMA_SYNC_FORDEV); else (void) ddi_dma_sync(tx_buf->dma_handle, 0, tx_buf->len, DDI_DMA_SYNC_FORDEV); #else (void) ddi_dma_sync(tx_buf->dma_handle, 0, tx_buf->len, DDI_DMA_SYNC_FORDEV); #endif packet->data_transfer_type = USE_BCOPY; desc_count = e1000g_fill_tx_desc(tx_ring, packet, tx_buf->dma_address, tx_buf->len); if (desc_count <= 0) return (-1); } return (desc_count); } static int e1000g_tx_bind(e1000g_tx_ring_t *tx_ring, p_tx_sw_packet_t packet, mblk_t *mp) { int j; int mystat; size_t len; ddi_dma_cookie_t dma_cookie; uint_t ncookies; int desc_count; uint32_t desc_total; desc_total = 0; len = MBLKL(mp); /* * ddi_dma_addr_bind_handle() allocates DMA resources for a * memory object such that a device can perform DMA to or from * the object. DMA resources are allocated considering the * device's DMA attributes as expressed by ddi_dma_attr(9S) * (see ddi_dma_alloc_handle(9F)). * * ddi_dma_addr_bind_handle() fills in the first DMA cookie * pointed to by cookiep with the appropriate address, length, * and bus type. *ccountp is set to the number of DMA cookies * representing this DMA object. Subsequent DMA cookies must be * retrieved by calling ddi_dma_nextcookie(9F) the number of * times specified by *countp - 1. */ switch (packet->dma_type) { #ifdef __sparc case USE_DVMA: dvma_kaddr_load(packet->tx_dma_handle, (caddr_t)mp->b_rptr, len, 0, &dma_cookie); dvma_sync(packet->tx_dma_handle, 0, DDI_DMA_SYNC_FORDEV); ncookies = 1; packet->data_transfer_type = USE_DVMA; break; #endif case USE_DMA: if ((mystat = ddi_dma_addr_bind_handle( packet->tx_dma_handle, NULL, (caddr_t)mp->b_rptr, len, DDI_DMA_WRITE | DDI_DMA_STREAMING, DDI_DMA_DONTWAIT, 0, &dma_cookie, &ncookies)) != DDI_DMA_MAPPED) { e1000g_log(tx_ring->adapter, CE_WARN, "Couldn't bind mblk buffer to Tx DMA handle: " "return: %X, Pkt: %X\n", mystat, packet); return (-1); } /* * An implicit ddi_dma_sync() is done when the * ddi_dma_addr_bind_handle() is called. So we * don't need to explicitly call ddi_dma_sync() * here any more. */ ASSERT(ncookies); E1000G_DEBUG_STAT_COND(tx_ring->stat_multi_cookie, (ncookies > 1)); /* * The data_transfer_type value must be set after the handle * has been bound, for it will be used in e1000g_free_tx_swpkt() * to decide whether we need to unbind the handle. */ packet->data_transfer_type = USE_DMA; break; default: ASSERT(B_FALSE); break; } packet->num_mblk_frag++; /* * Each address could span thru multpile cookie.. * Each cookie will have one descriptor */ for (j = ncookies; j != 0; j--) { desc_count = e1000g_fill_tx_desc(tx_ring, packet, dma_cookie.dmac_laddress, dma_cookie.dmac_size); if (desc_count <= 0) return (-1); desc_total += desc_count; /* * ddi_dma_nextcookie() retrieves subsequent DMA * cookies for a DMA object. * ddi_dma_nextcookie() fills in the * ddi_dma_cookie(9S) structure pointed to by * cookiep. The ddi_dma_cookie(9S) structure * must be allocated prior to calling * ddi_dma_nextcookie(). The DMA cookie count * returned by ddi_dma_buf_bind_handle(9F), * ddi_dma_addr_bind_handle(9F), or * ddi_dma_getwin(9F) indicates the number of DMA * cookies a DMA object consists of. If the * resulting cookie count, N, is larger than 1, * ddi_dma_nextcookie() must be called N-1 times * to retrieve all DMA cookies. */ if (j > 1) { ddi_dma_nextcookie(packet->tx_dma_handle, &dma_cookie); } } return (desc_total); } static void e1000g_fill_context_descriptor(context_data_t *cur_context, struct e1000_context_desc *context_desc) { if (cur_context->cksum_flags & HCK_IPV4_HDRCKSUM) { context_desc->lower_setup.ip_fields.ipcss = cur_context->ether_header_size; context_desc->lower_setup.ip_fields.ipcso = cur_context->ether_header_size + offsetof(struct ip, ip_sum); context_desc->lower_setup.ip_fields.ipcse = cur_context->ether_header_size + cur_context->cksum_start - 1; } else context_desc->lower_setup.ip_config = 0; if (cur_context->cksum_flags & HCK_PARTIALCKSUM) { /* * The packet with same protocol has the following * stuff and start offset: * | Protocol | Stuff | Start | Checksum * | | Offset | Offset | Enable * | IPv4 + TCP | 0x24 | 0x14 | Yes * | IPv4 + UDP | 0x1A | 0x14 | Yes * | IPv6 + TCP | 0x20 | 0x10 | No * | IPv6 + UDP | 0x14 | 0x10 | No */ context_desc->upper_setup.tcp_fields.tucss = cur_context->cksum_start + cur_context->ether_header_size; context_desc->upper_setup.tcp_fields.tucso = cur_context->cksum_stuff + cur_context->ether_header_size; context_desc->upper_setup.tcp_fields.tucse = 0; } else context_desc->upper_setup.tcp_config = 0; if (cur_context->lso_flag) { context_desc->tcp_seg_setup.fields.mss = cur_context->mss; context_desc->tcp_seg_setup.fields.hdr_len = cur_context->hdr_len; /* * workaround for 82546EB errata 23, status-writeback * reporting (RS) should not be set on context or * Null descriptors */ context_desc->cmd_and_length = E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE | E1000_TXD_CMD_IP | E1000_TXD_CMD_TCP | E1000_TXD_DTYP_C | cur_context->pay_len; } else { context_desc->cmd_and_length = E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_C; /* * Zero out the options for TCP Segmentation Offload */ context_desc->tcp_seg_setup.data = 0; } } static int e1000g_fill_tx_desc(e1000g_tx_ring_t *tx_ring, p_tx_sw_packet_t packet, uint64_t address, size_t size) { struct e1000_hw *hw = &tx_ring->adapter->shared; p_sw_desc_t desc; if (hw->mac.type == e1000_82544) { if (hw->bus.type == e1000_bus_type_pcix) return (e1000g_tx_workaround_PCIX_82544(packet, address, size)); if (size > JUMBO_FRAG_LENGTH) return (e1000g_tx_workaround_jumbo_82544(packet, address, size)); } ASSERT(packet->num_desc < MAX_TX_DESC_PER_PACKET); desc = &packet->desc[packet->num_desc]; desc->address = address; desc->length = (uint32_t)size; packet->num_desc++; return (1); } static int e1000g_tx_workaround_PCIX_82544(p_tx_sw_packet_t packet, uint64_t address, size_t size) { p_sw_desc_t desc; int desc_count; long size_left; size_t len; uint32_t counter; uint32_t array_elements; desc_array_t desc_array; /* * Coexist Workaround for cordova: RP: 07/04/03 * * RP: ERRATA: Workaround ISSUE: * 8kb_buffer_Lockup CONTROLLER: Cordova Breakup * Eachbuffer in to 8kb pieces until the * remainder is < 8kb */ size_left = size; desc_count = 0; while (size_left > 0) { if (size_left > MAX_TX_BUF_SIZE) len = MAX_TX_BUF_SIZE; else len = size_left; array_elements = e1000g_fill_82544_desc(address, len, &desc_array); for (counter = 0; counter < array_elements; counter++) { ASSERT(packet->num_desc < MAX_TX_DESC_PER_PACKET); /* * Put in the buffer address */ desc = &packet->desc[packet->num_desc]; desc->address = desc_array.descriptor[counter].address; desc->length = desc_array.descriptor[counter].length; packet->num_desc++; desc_count++; } /* for */ /* * Update the buffer address and length */ address += MAX_TX_BUF_SIZE; size_left -= MAX_TX_BUF_SIZE; } /* while */ return (desc_count); } static int e1000g_tx_workaround_jumbo_82544(p_tx_sw_packet_t packet, uint64_t address, size_t size) { p_sw_desc_t desc; int desc_count; long size_left; uint32_t offset; /* * Workaround for Jumbo Frames on Cordova * PSD 06/01/2001 */ size_left = size; desc_count = 0; offset = 0; while (size_left > 0) { ASSERT(packet->num_desc < MAX_TX_DESC_PER_PACKET); desc = &packet->desc[packet->num_desc]; desc->address = address + offset; if (size_left > JUMBO_FRAG_LENGTH) desc->length = JUMBO_FRAG_LENGTH; else desc->length = (uint32_t)size_left; packet->num_desc++; desc_count++; offset += desc->length; size_left -= JUMBO_FRAG_LENGTH; } return (desc_count); } #pragma inline(e1000g_82547_tx_move_tail_work) static void e1000g_82547_tx_move_tail_work(e1000g_tx_ring_t *tx_ring) { struct e1000_hw *hw; uint16_t hw_tdt; uint16_t sw_tdt; struct e1000_tx_desc *tx_desc; uint16_t length = 0; boolean_t eop = B_FALSE; struct e1000g *Adapter; Adapter = tx_ring->adapter; hw = &Adapter->shared; hw_tdt = E1000_READ_REG(hw, E1000_TDT(0)); sw_tdt = tx_ring->tbd_next - tx_ring->tbd_first; while (hw_tdt != sw_tdt) { tx_desc = &(tx_ring->tbd_first[hw_tdt]); length += tx_desc->lower.flags.length; eop = tx_desc->lower.data & E1000_TXD_CMD_EOP; if (++hw_tdt == Adapter->tx_desc_num) hw_tdt = 0; if (eop) { if ((Adapter->link_duplex == HALF_DUPLEX) && (e1000_fifo_workaround_82547(hw, length) != E1000_SUCCESS)) { if (tx_ring->timer_enable_82547) { ASSERT(tx_ring->timer_id_82547 == 0); tx_ring->timer_id_82547 = timeout(e1000g_82547_timeout, (void *)tx_ring, drv_usectohz(10000)); } return; } else { E1000_WRITE_REG(hw, E1000_TDT(0), hw_tdt); e1000_update_tx_fifo_head_82547(hw, length); length = 0; } } } } static void e1000g_82547_timeout(void *arg) { e1000g_tx_ring_t *tx_ring; tx_ring = (e1000g_tx_ring_t *)arg; mutex_enter(&tx_ring->tx_lock); tx_ring->timer_id_82547 = 0; e1000g_82547_tx_move_tail_work(tx_ring); mutex_exit(&tx_ring->tx_lock); } static void e1000g_82547_tx_move_tail(e1000g_tx_ring_t *tx_ring) { timeout_id_t tid; ASSERT(MUTEX_HELD(&tx_ring->tx_lock)); tid = tx_ring->timer_id_82547; tx_ring->timer_id_82547 = 0; if (tid != 0) { tx_ring->timer_enable_82547 = B_FALSE; mutex_exit(&tx_ring->tx_lock); (void) untimeout(tid); mutex_enter(&tx_ring->tx_lock); } tx_ring->timer_enable_82547 = B_TRUE; e1000g_82547_tx_move_tail_work(tx_ring); }