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Split common TX/RX descriptor DMA tag to TX and RX DMA tags

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respectively and fix all bus_dma(9) issues seen when bounce buffers
are used.
 o Setup frame handling had no bus_dmamap_sync(9) which prevented
   driver from configuring RX filter. Add missing bus_dmamap_sync(9)
   in both dc_setfilt_21143()/dc_setfilt_xircom() and dc_txeof().
 o Use bus_addr_t for DMA segment instead of using u_int32_t.
 o Introduce dc_dma_alloc()/dc_dma_free() functions to allocate/free
   DMA'able memory.
 o Create two DMA descriptor list for each TX/RX lists. This change
   will minimize the size of bounce buffers that would be used in
   each TX/RX path.  Previously driver had to copy both TX/RX lists
   when bounce buffer is active.
 o 21143 data sheet says descriptor list requires 4 bytes alignment.
   Remove PAGE_SIZE alignment restriction and use
   sizeof(struct dc_dec).
 o Setup frame requires 4 bytes alignment.  Remove PAGE_SIZE
   alignment restriction and use sizeof(struct dc_dec).
 o Add missing DMA map unload for both setup frame and TX/RX
   descriptor list.
 o Overhaul RX handling logic such that make driver always allocate
   new RX buffer with dc_newbuf(). Previously driver allowed to
   copy received frame with m_devget(9) after passing the
   descriptor ownership to controller. This can lead to passing
   wrong frame to upper stack.
 o Introduce dc_discard_rxbuf() which will discard received frame
   and reuse loaded DMA map and RX mbuf.
 o Correct several wrong bus_dmamap_sync(9) usage in dc_rxeof and
   dc_txeof. The TX/RX descriptor lists are updated by both driver
   and HW so READ/WRITE semantics should be used.
 o If driver failed to allocate new RX buffer, update if_iqdrops
   counter instead of if_ierrors since driver received the frame
   without errors.
 o Make sure to unload loaded setup frame DMA map in dc_txeof and
   clear the mark of setup frame of the TX descriptor in dc_txeof().
 o Add check for possible TX descriptor overruns in dc_encap() and
   move check for free buffer to caller, dc_start_locked().
 o Swap the loaded DMA map and the last DMA map for multi-segmented
   frames. Since dc_txeof() assumes the last descriptor of the
   frame has the DMA map, driver should swap the first and the last
   DMA map in dc_encap(). Previously driver tried to unload
   not-yet-loaded DMA map such that the loaded DMA map was not
   unloaded at all for multi-segmented frames.
 o Rewrite DC_RXDESC/DC_TXDESC macro to simpler one.
 o Remove definition of ETHER_ALIGN, it's already defined in
   ethernet.h.

With this changes, dc(4) works with bounce buffers and it shall
also fix issues which might have shown in PAE environments.

Tested by:	marius
This commit is contained in:
Pyun YongHyeon 2011-02-19 02:47:10 +00:00
parent a84b4e80ca
commit 5f14ee2363
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=218832
2 changed files with 427 additions and 274 deletions
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664
sys/dev/dc/if_dc.c
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File diff suppressed because it is too large Load Diff

37
sys/dev/dc/if_dcreg.h
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@ -471,11 +471,15 @@ struct dc_desc {
#define DC_INC(x, y) (x) = (x + 1) % y
#define DC_LIST_ALIGN (sizeof(struct dc_desc))
#define DC_RXBUF_ALIGN 4
/* Macros to easily get the DMA address of a descriptor. */
#define DC_RXDESC(sc, i) (sc->dc_laddr + \
(uintptr_t)(sc->dc_ldata->dc_rx_list + i) - (uintptr_t)sc->dc_ldata)
#define DC_TXDESC(sc, i) (sc->dc_laddr + \
(uintptr_t)(sc->dc_ldata->dc_tx_list + i) - (uintptr_t)sc->dc_ldata)
#define DC_ADDR_LO(x) ((uint64_t)(x) & 0xFFFFFFFF)
#define DC_RXDESC(sc, i) \
(DC_ADDR_LO(sc->dc_ldata.dc_rx_list_paddr + (sizeof(struct dc_desc) * i)))
#define DC_TXDESC(sc, i) \
(DC_ADDR_LO(sc->dc_ldata.dc_tx_list_paddr + (sizeof(struct dc_desc) * i)))
#if BYTE_ORDER == BIG_ENDIAN
#define DC_SP_MAC(x) ((x) << 16)
@ -484,10 +488,15 @@ struct dc_desc {
#endif
struct dc_list_data {
struct dc_desc dc_rx_list[DC_RX_LIST_CNT];
struct dc_desc dc_tx_list[DC_TX_LIST_CNT];
struct dc_desc *dc_rx_list;
bus_addr_t dc_rx_list_paddr;
struct dc_desc *dc_tx_list;
bus_addr_t dc_tx_list_paddr;
};
#define DC_RX_LIST_SZ ((sizeof(struct dc_desc) * DC_RX_LIST_CNT))
#define DC_TX_LIST_SZ ((sizeof(struct dc_desc) * DC_TX_LIST_CNT))
struct dc_chain_data {
struct mbuf *dc_rx_chain[DC_RX_LIST_CNT];
struct mbuf *dc_tx_chain[DC_TX_LIST_CNT];
@ -722,14 +731,17 @@ struct dc_softc {
device_t dc_dev; /* device info */
bus_space_handle_t dc_bhandle; /* bus space handle */
bus_space_tag_t dc_btag; /* bus space tag */
bus_dma_tag_t dc_ltag; /* tag for descriptor ring */
bus_dmamap_t dc_lmap; /* map for descriptor ring */
u_int32_t dc_laddr; /* DMA address of dc_ldata */
bus_dma_tag_t dc_mtag; /* tag for mbufs */
bus_dma_tag_t dc_ptag; /* parent DMA tag */
bus_dmamap_t dc_sparemap;
bus_dma_tag_t dc_rx_ltag; /* tag for RX descriptors */
bus_dmamap_t dc_rx_lmap;
bus_dma_tag_t dc_tx_ltag; /* tag for TX descriptors */
bus_dmamap_t dc_tx_lmap;
bus_dma_tag_t dc_stag; /* tag for the setup frame */
bus_dmamap_t dc_smap; /* map for the setup frame */
u_int32_t dc_saddr; /* DMA address of setup frame */
bus_addr_t dc_saddr; /* DMA address of setup frame */
bus_dma_tag_t dc_rx_mtag; /* tag for RX mbufs */
bus_dma_tag_t dc_tx_mtag; /* tag for TX mbufs */
void *dc_intrhand;
struct resource *dc_irq;
struct resource *dc_res;
@ -749,7 +761,7 @@ struct dc_softc {
u_int32_t dc_eaddr[2];
u_int8_t *dc_srom;
struct dc_mediainfo *dc_mi;
struct dc_list_data *dc_ldata;
struct dc_list_data dc_ldata;
struct dc_chain_data dc_cdata;
struct callout dc_stat_ch;
struct callout dc_wdog_ch;
@ -796,7 +808,6 @@ struct dc_softc {
bus_space_barrier(sc->dc_btag, sc->dc_bhandle, reg, 4, flags)
#define DC_TIMEOUT 1000
#define ETHER_ALIGN 2
/*
* General constants that are fun to know.